Tag version 0.5.3-alpha

Attempts to move the Active Position upwards to a lesser numbered row,
or leftwards within the same row to a lesser numbered column, are now
highlighted red within the triplet list so the user can see which
triplets are being ignored due to these errors.

Detection for other triplet errors such as reserved bits/values or
object related errors will be added later on.

This is a part of moving the Active Position logic from the renderer
to the triplet list, so a renderer won't be needed if the ability to
editing (G)POP pages is added in the future.

README.md

@@ -5,6 +5,9 @@ Features
 - Load and save teletext pages in .tti format.
 - Rendering of teletext pages in Levels 1, 1.5, 2.5 and 3.5
 - Rendering of Local Objects and side panels.
+- Import and export of single pages in .t42 format.
+- Export PNG images of teletext pages.
+- Undo and redo of editing actions.
 - Interactive X/26 Local Enhancement Data triplet editor.
 - Editing of X/27/4 and X/27/5 compositional links to enhancement data pages.
 - Palette editor.
@@ -28,7 +31,7 @@ The following X/26 enhancement triplets are not rendered by the editor, although
 - Level 3.5 font style: bold, italic and proportional spacing.
 
 ## Using the X/26 triplet editor
-The X/26 triplet editor sorts all the triplet modes available into categories selected by the triplet *type* dropdown on the left. The categories are:
+The X/26 triplet editor sorts all the triplet modes available into categories, which are:
 - Set Active Position
 - Row triplet - full screen and full row colours, address row 0 and DRCS mode
 - Column triplet - non-spacing attributes and overwriting characters
@@ -36,9 +39,9 @@ The X/26 triplet editor sorts all the triplet modes available into categories se
 - Terminator
 - PDC/reserved
 
-Selecting "Set Active Position" or "Terminator" will change the triplet mode immediately, other selections will activate the triplet *mode* dropdown on the right which can be used to then change the triplet mode. Most triplet modes will present varying widgets below which can be used to alter the parameters of the currently selected triplet (e.g. colour or character).
+After selecting the triplet mode the Row and Column spinboxes can then be used to place the Active Position of the selected triplet, whether or not each spinbox can be altered depends on the mode of the selected triplet. As well as the explicit "Set Active Position" triplet that can set both the row and the column, all column triplets can simultaneously set the column of the Active Position. Additionally the Full Row Colour triplet can set the row of the Active Position, with the column always set to 0.
 
-Between the two dropdowns are the Row and Column spinboxes that are used to place the Active Position of the selected triplet, whether or not each spinbox can be altered depends on the mode of the selected triplet. As well as the explicit "Set Active Position" triplet that can set both the row and the column, all column triplets can simultaneously set the column of the Active Position. Additionally the Full Row Colour triplet can set the row of the Active Position, with the column always set to 0.
+Most triplet modes will present varying widgets below which can be used to alter the parameters of the currently selected triplet e.g. colour or character.
 
 By checking "raw values" it is also possible to view and edit the raw Address, Mode and Data numbers of the triplets. When editing triplets this way, remember that address values 0-39 select a column triplet which has one set of modes and address values 40-63 select a row triplet which has a different set of modes.
 
@@ -49,11 +52,7 @@ The Active Position, whether set explicitly by a "Set Active Position" triplet o
 - The Active Position can never be moved up to a lesser numbered row.
 - The Active Position can never be moved left *within the same row* to a lesser numbered column, but it can be moved left at the same time as it is moved down to a greater numbered row.
 
-If this rule is not followed then triplets in earlier screen addresses will be ignored.
+If this rule is not followed then triplets in earlier screen addresses will be ignored. Triplets that break this rule will be highlighted red in the X/26 triplet editor.
 
 ### Objects
-"Define ... Object" triplets need to declare that they are in the correct place in the triplet list e.g. if the Define Object triplet is at `d1 t3` in the list then the data field must show `Local: d1 t3`, otherwise the Object won't appear.
-
-Insert and deleting triplets from the list will upset the Object pointers on both "Define" and "Invoke" triplets and will need to be corrected afterwards. A future version of the editor may adjust these pointers automatically.
-
 "Invoke ... Object" triplets must point to a "Define ... Object" of the same type e.g. "Invoke *Active* Object" must point to a "Define *Active* Object", otherwise the Object won't appear.

document.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -17,12 +17,46 @@
  * along with QTeletextMaker.  If not, see <https://www.gnu.org/licenses/>.
  */
 
+#include <QAbstractListModel>
 #include <vector>
 
 #include "document.h"
 
 #include "levelonepage.h"
 
+ClutModel::ClutModel(QObject *parent): QAbstractListModel(parent)
+{
+	m_subPage = nullptr;
+}
+
+int ClutModel::rowCount(const QModelIndex & /*parent*/) const
+{
+	return 32;
+}
+
+QVariant ClutModel::data(const QModelIndex &index, int role) const
+{
+	if (!index.isValid())
+		return QVariant();
+
+	if (role == Qt::DisplayRole)
+		return QString("CLUT %1:%2").arg(index.row() >> 3).arg(index.row() & 0x07);
+
+	if (role == Qt::DecorationRole && m_subPage != nullptr)
+		return m_subPage->CLUTtoQColor(index.row());
+
+	return QVariant();
+}
+
+void ClutModel::setSubPage(LevelOnePage *subPage)
+{
+	if (subPage != m_subPage) {
+		m_subPage = subPage;
+		emit dataChanged(createIndex(0, 0), createIndex(31, 0), QVector<int>(Qt::DecorationRole));
+	}
+}
+
+
 TeletextDocument::TeletextDocument()
 {
 	m_pageNumber = 0x199;
@@ -34,11 +68,17 @@ TeletextDocument::TeletextDocument()
 	m_undoStack = new QUndoStack(this);
 	m_cursorRow = 1;
 	m_cursorColumn = 0;
+	m_selectionCornerRow = m_selectionCornerColumn = -1;
 	m_selectionSubPage = nullptr;
+
+	m_clutModel = new ClutModel;
+	m_clutModel->setSubPage(m_subPages[0]);
 }
 
 TeletextDocument::~TeletextDocument()
 {
+	delete m_clutModel;
+
 	for (auto &subPage : m_subPages)
 		delete(subPage);
 	for (auto &recycleSubPage : m_recycleSubPages)
@@ -71,8 +111,12 @@ void TeletextDocument::selectSubPageIndex(int newSubPageIndex, bool forceRefresh
 	// forceRefresh overrides "beyond the last subpage" check, so inserting a subpage after the last one still shows - dangerous workaround?
 	if (forceRefresh || (newSubPageIndex != m_currentSubPageIndex && newSubPageIndex < m_subPages.size())) {
 		emit aboutToChangeSubPage();
+
 		m_currentSubPageIndex = newSubPageIndex;
+
+		m_clutModel->setSubPage(m_subPages[m_currentSubPageIndex]);
 		emit subPageSelected();
+		emit selectionMoved();
 		return;
 	}
 }
@@ -81,8 +125,12 @@ void TeletextDocument::selectSubPageNext()
 {
 	if (m_currentSubPageIndex < m_subPages.size()-1) {
 		emit aboutToChangeSubPage();
+
 		m_currentSubPageIndex++;
+
+		m_clutModel->setSubPage(m_subPages[m_currentSubPageIndex]);
 		emit subPageSelected();
+		emit selectionMoved();
 	}
 }
 
@@ -90,8 +138,12 @@ void TeletextDocument::selectSubPagePrevious()
 {
 	if (m_currentSubPageIndex > 0) {
 		emit aboutToChangeSubPage();
+
 		m_currentSubPageIndex--;
+
+		m_clutModel->setSubPage(m_subPages[m_currentSubPageIndex]);
 		emit subPageSelected();
+		emit selectionMoved();
 	}
 }
 
@@ -112,6 +164,8 @@ void TeletextDocument::insertSubPage(int beforeSubPageIndex, bool copySubPage)
 
 void TeletextDocument::deleteSubPage(int subPageToDelete)
 {
+	m_clutModel->setSubPage(nullptr);
+
 	delete(m_subPages[subPageToDelete]);
 	m_subPages.erase(m_subPages.begin()+subPageToDelete);
 }
@@ -128,17 +182,12 @@ void TeletextDocument::unDeleteSubPageFromRecycle(int subPage)
 	m_recycleSubPages.pop_back();
 }
 
-void TeletextDocument::setPageNumber(QString pageNumberString)
+void TeletextDocument::setPageNumber(int pageNumber)
 {
-	bool pageNumberOk;
-	int pageNumberRead = pageNumberString.toInt(&pageNumberOk, 16);
-	if ((!pageNumberOk) || pageNumberRead < 0x100 || pageNumberRead > 0x8ff)
-		return;
-
 	// If the magazine number was changed, we need to update the relative magazine numbers in FastText
 	// and page enhancement links
 	int oldMagazine = (m_pageNumber & 0xf00);
-	int newMagazine = (pageNumberRead & 0xf00);
+	int newMagazine = (pageNumber & 0xf00);
 	// Fix magazine 0 to 8
 	if (oldMagazine == 0x800)
 		oldMagazine = 0x000;
@@ -146,7 +195,7 @@ void TeletextDocument::setPageNumber(QString pageNumberString)
 		newMagazine = 0x000;
 	int magazineFlip = oldMagazine ^ newMagazine;
 
-	m_pageNumber = pageNumberRead;
+	m_pageNumber = pageNumber;
 
 	for (auto &subPage : m_subPages)
 		if (magazineFlip) {
@@ -157,6 +206,17 @@ void TeletextDocument::setPageNumber(QString pageNumberString)
 	}
 }
 
+void TeletextDocument::setPageNumberFromString(QString pageNumberString)
+{
+	bool pageNumberOk;
+	int pageNumberRead = pageNumberString.toInt(&pageNumberOk, 16);
+
+	if ((!pageNumberOk) || pageNumberRead < 0x100 || pageNumberRead > 0x8ff)
+		return;
+
+	setPageNumber(pageNumberRead);
+}
+
 void TeletextDocument::setDescription(QString newDescription)
 {
 	m_description = newDescription;
@@ -168,62 +228,124 @@ void TeletextDocument::setFastTextLinkPageNumberOnAllSubPages(int linkNumber, in
 		subPage->setFastTextLinkPageNumber(linkNumber, pageNumber);
 }
 
-void TeletextDocument::cursorUp()
+void TeletextDocument::cursorUp(bool shiftKey)
 {
+	if (shiftKey && !selectionActive())
+		setSelectionCorner(m_cursorRow, m_cursorColumn);
+
 	if (--m_cursorRow == 0)
 		m_cursorRow = 24;
+
+	if (shiftKey)
+		emit selectionMoved();
+	else
+		cancelSelection();
+
 	emit cursorMoved();
 }
 
-void TeletextDocument::cursorDown()
+void TeletextDocument::cursorDown(bool shiftKey)
 {
+	if (shiftKey && !selectionActive())
+		setSelectionCorner(m_cursorRow, m_cursorColumn);
+
 	if (++m_cursorRow == 25)
 		m_cursorRow = 1;
+
+	if (shiftKey)
+		emit selectionMoved();
+	else
+		cancelSelection();
+
 	emit cursorMoved();
 }
 
-void TeletextDocument::cursorLeft()
+void TeletextDocument::cursorLeft(bool shiftKey)
 {
+	if (shiftKey && !selectionActive())
+		setSelectionCorner(m_cursorRow, m_cursorColumn);
+
 	if (--m_cursorColumn == -1) {
 		m_cursorColumn = 39;
-		cursorUp();
+		cursorUp(shiftKey);
 	}
+
+	if (shiftKey)
+		emit selectionMoved();
+	else
+		cancelSelection();
+
 	emit cursorMoved();
 }
 
-void TeletextDocument::cursorRight()
+void TeletextDocument::cursorRight(bool shiftKey)
 {
+	if (shiftKey && !selectionActive())
+		setSelectionCorner(m_cursorRow, m_cursorColumn);
+
 	if (++m_cursorColumn == 40) {
 		m_cursorColumn = 0;
-		cursorDown();
+		cursorDown(shiftKey);
 	}
+
+	if (shiftKey)
+		emit selectionMoved();
+	else
+		cancelSelection();
+
 	emit cursorMoved();
 }
 
-void TeletextDocument::moveCursor(int cursorRow, int cursorColumn)
+void TeletextDocument::moveCursor(int cursorRow, int cursorColumn, bool selectionInProgress)
 {
+	if (selectionInProgress && !selectionActive())
+		setSelectionCorner(m_cursorRow, m_cursorColumn);
+
 	if (cursorRow != -1)
 		m_cursorRow = cursorRow;
 	if (cursorColumn != -1)
 		m_cursorColumn = cursorColumn;
+
+	if (selectionInProgress)
+		emit selectionMoved();
+	else
+		cancelSelection();
+
 	emit cursorMoved();
 }
 
+void TeletextDocument::setSelectionCorner(int row, int column)
+{
+	if (m_selectionCornerRow != row || m_selectionCornerColumn != column) {
+		m_selectionSubPage = currentSubPage();
+		m_selectionCornerRow = row;
+		m_selectionCornerColumn = column;
+
+//		emit selectionMoved();
+	}
+}
+
 void TeletextDocument::setSelection(int topRow, int leftColumn, int bottomRow, int rightColumn)
 {
-	if (m_selectionTopRow != topRow || m_selectionBottomRow != bottomRow || m_selectionLeftColumn != leftColumn || m_selectionRightColumn != rightColumn) {
+	if (selectionTopRow() != topRow || selectionBottomRow() != bottomRow || selectionLeftColumn() != leftColumn || selectionRightColumn() != rightColumn) {
 		m_selectionSubPage = currentSubPage();
-		m_selectionTopRow = topRow;
-		m_selectionBottomRow = bottomRow;
-		m_selectionLeftColumn = leftColumn;
-		m_selectionRightColumn = rightColumn;
+		m_selectionCornerRow = topRow;
+		m_cursorRow = bottomRow;
+		m_selectionCornerColumn = leftColumn;
+		m_cursorColumn = rightColumn;
+
 		emit selectionMoved();
+		emit cursorMoved();
 	}
 }
 
 void TeletextDocument::cancelSelection()
 {
-	m_selectionSubPage = nullptr;
+	if (m_selectionSubPage != nullptr) {
+		m_selectionSubPage = nullptr;
+		emit selectionMoved();
+		m_selectionCornerRow = m_selectionCornerColumn = -1;
+	}
 }
 
 int TeletextDocument::levelRequired() const

document.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -20,11 +20,28 @@
 #ifndef DOCUMENT_H
 #define DOCUMENT_H
 
+#include <QAbstractListModel>
 #include <QObject>
 #include <QUndoStack>
 #include <vector>
+
 #include "levelonepage.h"
 
+class ClutModel : public QAbstractListModel
+{
+	Q_OBJECT
+
+public:
+	ClutModel(QObject *parent = 0);
+
+	int rowCount(const QModelIndex &parent = QModelIndex()) const override;
+	QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
+	void setSubPage(LevelOnePage *page);
+
+private:
+	LevelOnePage *m_subPage;
+};
+
 class TeletextDocument : public QObject
 {
 	Q_OBJECT
@@ -57,25 +74,30 @@ public:
 	void deleteSubPageToRecycle(int);
 	void unDeleteSubPageFromRecycle(int);
 	int pageNumber() const { return m_pageNumber; }
-	void setPageNumber(QString);
+	void setPageNumber(int);
+	void setPageNumberFromString(QString);
 	QString description() const { return m_description; }
 	void setDescription(QString);
 	void setFastTextLinkPageNumberOnAllSubPages(int, int);
 	QUndoStack *undoStack() const { return m_undoStack; }
+	ClutModel *clutModel() const { return m_clutModel; }
 	int cursorRow() const { return m_cursorRow; }
 	int cursorColumn() const { return m_cursorColumn; }
-	void cursorUp();
-	void cursorDown();
-	void cursorLeft();
-	void cursorRight();
-	void moveCursor(int, int);
-	int selectionTopRow() const { return m_selectionTopRow; }
-	int selectionBottomRow() const { return m_selectionBottomRow; }
-	int selectionLeftColumn() const { return m_selectionLeftColumn; }
-	int selectionRightColumn() const { return m_selectionRightColumn; }
-	int selectionWidth() const { return m_selectionRightColumn - m_selectionLeftColumn + 1; }
-	int selectionHeight() const { return m_selectionBottomRow - m_selectionTopRow + 1; }
+	void cursorUp(bool shiftKey=false);
+	void cursorDown(bool shiftKey=false);
+	void cursorLeft(bool shiftKey=false);
+	void cursorRight(bool shiftKey=false);
+	void moveCursor(int, int, bool selectionInProgress=false);
+	int selectionTopRow() const { return m_selectionCornerRow == -1 ? m_cursorRow : qMin(m_selectionCornerRow, m_cursorRow); }
+	int selectionBottomRow() const { return qMax(m_selectionCornerRow, m_cursorRow); }
+	int selectionLeftColumn() const { return m_selectionCornerColumn == -1 ? m_cursorColumn : qMin(m_selectionCornerColumn, m_cursorColumn); }
+	int selectionRightColumn() const { return qMax(m_selectionCornerColumn, m_cursorColumn); }
+	int selectionWidth() const { return m_selectionCornerColumn == -1 ? 1 : selectionRightColumn() - selectionLeftColumn() + 1; }
+	int selectionHeight() const { return m_selectionCornerRow == -1 ? 1 : selectionBottomRow() - selectionTopRow() + 1; }
 	bool selectionActive() const { return m_selectionSubPage == currentSubPage(); }
+	int selectionCornerRow() const { return m_selectionCornerRow == -1 ? m_cursorRow : m_selectionCornerRow; }
+	int selectionCornerColumn() const { return m_selectionCornerColumn == -1 ? m_cursorColumn : m_selectionCornerColumn; }
+	void setSelectionCorner(int, int);
 	void setSelection(int, int, int, int);
 	void cancelSelection();
 	int levelRequired() const;
@@ -99,8 +121,9 @@ private:
 	std::vector<LevelOnePage *> m_subPages;
 	std::vector<LevelOnePage *> m_recycleSubPages;
 	QUndoStack *m_undoStack;
-	int m_cursorRow, m_cursorColumn, m_selectionTopRow, m_selectionBottomRow, m_selectionLeftColumn, m_selectionRightColumn;
+	int m_cursorRow, m_cursorColumn, m_selectionCornerRow, m_selectionCornerColumn;
 	LevelOnePage *m_selectionSubPage;
+	ClutModel *m_clutModel;
 };
 
 #endif

examples/Level1p5-Defcon.tti

@@ -0,0 +1,23 @@
+PN,11600
+SC,0000
+PS,8000
+CT,8,T
+OL,26,@lD@Ib\UbTXb\ZbT]b\`B]mD@HB{VBsWB{[Bs\B{
+OL,26,AaBRnD@`BraB]oD@HBXVBPWBX[BP\BX`B}pD@Iby
+OL,26,BUbqXbyZbq]byaBruD@KBYLBSRbTVb\ZbT^b\cbY
+OL,26,CdBSvD@JBYKBSLBywD@Fb\JBTKByLBsVB^ZbX[bU
+OL,26,D\bS^bxxD@[bx\bu]bsyD@BbqFbyRbqVbyCC
+OL,3,W    <,,,,,,,,,,,,,,,,,,,,,,,,,,,,,l    
+OL,4,W    5t   xt xt 5 j    
+OL,5,W    5 "         !"/ !"  j    
+OL,6,W    5              j5j    
+OL,7,W    5 `         0`| 0`  j    
+OL,8,W    5'      +' +'  jj    
+OL,9,W    -,,,,,,,,,,,,,,,,,,,,,,,,,,,,,.    
+OL,12,V<,,,,,lR<,,,,,lS<,,,,,lQ<,,,,,lW<,,,,,l
+OL,13,V5jR5 `5jS5xtjQ5xtjW5 `~5 j
+OL,14,V55   jR5 ~75jS5/% jjQ5/% jjW5 #5 j
+OL,15,V5tjR5z? 5jS5 j5jQ5`x~/jW5  5 j
+OL,16,V5|4 jjR5jS5|4 jjQ5?#  jW5  5 j
+OL,17,V5+'jR5   5jS5+'jQ5jW5  5 j
+OL,18,V-,,,,,.R-,,,,,.S-,,,,,.Q-,,,,,.W-,,,,,.

examples/SidePanels-PriceChop.tti

@@ -0,0 +1,33 @@
+PN,13200
+SC,0000
+PS,8000
+CT,8,T
+OL,28,@@@|H@p_@|wsA@@AfUrLs_w}ww]_}_wM@p
+OL,26,@rD@Ab|BBpKBxLbtsD@BB{CbqJbyKBstD@Db|EBp
+OL,26,AHBxIbtuD@EB{FbqGbyHBswD@AbqLbyxD@Bb|CBp
+OL,26,BJBxKbtyD@CB{DbqIbyJBszD@Eb|FBpGBxHbt{D@
+OL,26,CFB{GBs}aJ@cJhPThr]hP`hre~aI@cI_Cxv]@It
+OL,26,DAipBitCIwGi\iD@@@H@irAiyBIzCirDIyxve@Iy
+OL,26,EAIqCiqDItEipFitGIwiD@@@HAisBIvCipDiyEis
+OL,26,FFiwGi{BBBBBBBBBBB
+OL,1, calls cost #5  WZ`p0ppb`p0pp `p0up`p0pp
+OL,2, 0909 879 0100  WZjp55"jj 1=.(j 15jj 5uz
+OL,3, GB  #9.99 p&p  WZ*  ! ""#!## "#!!""#!% 
+OL,4,                                W Zn,h h
+OL,5,C]Dstart #89 \                  W Zjp"d&
+OL,6,S############                           
+OL,7,                                    LIVE
+OL,8,E]G now at   \                          
+OL,9,Ussssssssssss                           
+OL,10,U+'                           
+OL,11,U^"o]G#3U?\!                            
+OL,12,U   +'                              
+OL,13,U    "o?!                               
+OL,14,Spppppppppppp                           
+OL,15,S+]D^leftS\'                           
+OL,16,S^"o]D24S?\!                            
+OL,17,S   +'                              
+OL,18,S    "o?!                               
+OL,19,S                                       
+OL,21,E]G9ct gold curb chain   9ct gold curb c
+OL,22,C]DNEW BUYER   JOHN london   JANET manch

hamming.h

@@ -0,0 +1,262 @@
+#ifndef HAMMING_H
+#define HAMMING_H
+
+// Hamming 8/4 encoding table
+// encoded_value = hamming_8_4_encode[value_to_encode]
+const unsigned char hamming_8_4_encode[16] = {
+	0x15, 0x02, 0x49, 0x5e, 0x64, 0x73, 0x38, 0x2f,
+	0xd0, 0xc7, 0x8c, 0x9b, 0xa1, 0xb6, 0xfd, 0xea
+};
+
+// Hamming 8/4 decoding table
+// decoded_value = hamming_8_4_decode[encoded_value]
+// 0xff - double bit error that can't be corrected
+const unsigned char hamming_8_4_decode[256] = {
+	0x01, 0xff, 0x01, 0x01, 0xff, 0x00, 0x01, 0xff,
+	0xff, 0x02, 0x01, 0xff, 0x0a, 0xff, 0xff, 0x07,
+	0xff, 0x00, 0x01, 0xff, 0x00, 0x00, 0xff, 0x00,
+	0x06, 0xff, 0xff, 0x0b, 0xff, 0x00, 0x03, 0xff,
+	0xff, 0x0c, 0x01, 0xff, 0x04, 0xff, 0xff, 0x07,
+	0x06, 0xff, 0xff, 0x07, 0xff, 0x07, 0x07, 0x07,
+	0x06, 0xff, 0xff, 0x05, 0xff, 0x00, 0x0d, 0xff,
+	0x06, 0x06, 0x06, 0xff, 0x06, 0xff, 0xff, 0x07,
+	0xff, 0x02, 0x01, 0xff, 0x04, 0xff, 0xff, 0x09,
+	0x02, 0x02, 0xff, 0x02, 0xff, 0x02, 0x03, 0xff,
+	0x08, 0xff, 0xff, 0x05, 0xff, 0x00, 0x03, 0xff,
+	0xff, 0x02, 0x03, 0xff, 0x03, 0xff, 0x03, 0x03,
+	0x04, 0xff, 0xff, 0x05, 0x04, 0x04, 0x04, 0xff,
+	0xff, 0x02, 0x0f, 0xff, 0x04, 0xff, 0xff, 0x07,
+	0xff, 0x05, 0x05, 0x05, 0x04, 0xff, 0xff, 0x05,
+	0x06, 0xff, 0xff, 0x05, 0xff, 0x0e, 0x03, 0xff,
+	0xff, 0x0c, 0x01, 0xff, 0x0a, 0xff, 0xff, 0x09,
+	0x0a, 0xff, 0xff, 0x0b, 0x0a, 0x0a, 0x0a, 0xff,
+	0x08, 0xff, 0xff, 0x0b, 0xff, 0x00, 0x0d, 0xff,
+	0xff, 0x0b, 0x0b, 0x0b, 0x0a, 0xff, 0xff, 0x0b,
+	0x0c, 0x0c, 0xff, 0x0c, 0xff, 0x0c, 0x0d, 0xff,
+	0xff, 0x0c, 0x0f, 0xff, 0x0a, 0xff, 0xff, 0x07,
+	0xff, 0x0c, 0x0d, 0xff, 0x0d, 0xff, 0x0d, 0x0d,
+	0x06, 0xff, 0xff, 0x0b, 0xff, 0x0e, 0x0d, 0xff,
+	0x08, 0xff, 0xff, 0x09, 0xff, 0x09, 0x09, 0x09,
+	0xff, 0x02, 0x0f, 0xff, 0x0a, 0xff, 0xff, 0x09,
+	0x08, 0x08, 0x08, 0xff, 0x08, 0xff, 0xff, 0x09,
+	0x08, 0xff, 0xff, 0x0b, 0xff, 0x0e, 0x03, 0xff,
+	0xff, 0x0c, 0x0f, 0xff, 0x04, 0xff, 0xff, 0x09,
+	0x0f, 0xff, 0x0f, 0x0f, 0xff, 0x0e, 0x0f, 0xff,
+	0x08, 0xff, 0xff, 0x05, 0xff, 0x0e, 0x0d, 0xff,
+	0xff, 0x0e, 0x0f, 0xff, 0x0e, 0x0e, 0xff, 0x0e
+};
+
+const unsigned char hamming_24_18_forward[2][256] = {
+	{
+		0x8b, 0x8c, 0x92, 0x95, 0xa1, 0xa6, 0xb8, 0xbf,
+		0xc0, 0xc7, 0xd9, 0xde, 0xea, 0xed, 0xf3, 0xf4,
+		0x0a, 0x0d, 0x13, 0x14, 0x20, 0x27, 0x39, 0x3e,
+		0x41, 0x46, 0x58, 0x5f, 0x6b, 0x6c, 0x72, 0x75,
+		0x09, 0x0e, 0x10, 0x17, 0x23, 0x24, 0x3a, 0x3d,
+		0x42, 0x45, 0x5b, 0x5c, 0x68, 0x6f, 0x71, 0x76,
+		0x88, 0x8f, 0x91, 0x96, 0xa2, 0xa5, 0xbb, 0xbc,
+		0xc3, 0xc4, 0xda, 0xdd, 0xe9, 0xee, 0xf0, 0xf7,
+		0x08, 0x0f, 0x11, 0x16, 0x22, 0x25, 0x3b, 0x3c,
+		0x43, 0x44, 0x5a, 0x5d, 0x69, 0x6e, 0x70, 0x77,
+		0x89, 0x8e, 0x90, 0x97, 0xa3, 0xa4, 0xba, 0xbd,
+		0xc2, 0xc5, 0xdb, 0xdc, 0xe8, 0xef, 0xf1, 0xf6,
+		0x8a, 0x8d, 0x93, 0x94, 0xa0, 0xa7, 0xb9, 0xbe,
+		0xc1, 0xc6, 0xd8, 0xdf, 0xeb, 0xec, 0xf2, 0xf5,
+		0x0b, 0x0c, 0x12, 0x15, 0x21, 0x26, 0x38, 0x3f,
+		0x40, 0x47, 0x59, 0x5e, 0x6a, 0x6d, 0x73, 0x74,
+		0x03, 0x04, 0x1a, 0x1d, 0x29, 0x2e, 0x30, 0x37,
+		0x48, 0x4f, 0x51, 0x56, 0x62, 0x65, 0x7b, 0x7c,
+		0x82, 0x85, 0x9b, 0x9c, 0xa8, 0xaf, 0xb1, 0xb6,
+		0xc9, 0xce, 0xd0, 0xd7, 0xe3, 0xe4, 0xfa, 0xfd,
+		0x81, 0x86, 0x98, 0x9f, 0xab, 0xac, 0xb2, 0xb5,
+		0xca, 0xcd, 0xd3, 0xd4, 0xe0, 0xe7, 0xf9, 0xfe,
+		0x00, 0x07, 0x19, 0x1e, 0x2a, 0x2d, 0x33, 0x34,
+		0x4b, 0x4c, 0x52, 0x55, 0x61, 0x66, 0x78, 0x7f,
+		0x80, 0x87, 0x99, 0x9e, 0xaa, 0xad, 0xb3, 0xb4,
+		0xcb, 0xcc, 0xd2, 0xd5, 0xe1, 0xe6, 0xf8, 0xff,
+		0x01, 0x06, 0x18, 0x1f, 0x2b, 0x2c, 0x32, 0x35,
+		0x4a, 0x4d, 0x53, 0x54, 0x60, 0x67, 0x79, 0x7e,
+		0x02, 0x05, 0x1b, 0x1c, 0x28, 0x2f, 0x31, 0x36,
+		0x49, 0x4e, 0x50, 0x57, 0x63, 0x64, 0x7a, 0x7d,
+		0x83, 0x84, 0x9a, 0x9d, 0xa9, 0xae, 0xb0, 0xb7,
+		0xc8, 0xcf, 0xd1, 0xd6, 0xe2, 0xe5, 0xfb, 0xfc
+	},
+	{
+		0x00, 0x89, 0x8a, 0x03, 0x8b, 0x02, 0x01, 0x88,
+		0x01, 0x88, 0x8b, 0x02, 0x8a, 0x03, 0x00, 0x89,
+		0x02, 0x8b, 0x88, 0x01, 0x89, 0x00, 0x03, 0x8a,
+		0x03, 0x8a, 0x89, 0x00, 0x88, 0x01, 0x02, 0x8b,
+		0x03, 0x8a, 0x89, 0x00, 0x88, 0x01, 0x02, 0x8b,
+		0x02, 0x8b, 0x88, 0x01, 0x89, 0x00, 0x03, 0x8a,
+		0x01, 0x88, 0x8b, 0x02, 0x8a, 0x03, 0x00, 0x89,
+		0x00, 0x89, 0x8a, 0x03, 0x8b, 0x02, 0x01, 0x88,
+		0x08, 0x81, 0x82, 0x0b, 0x83, 0x0a, 0x09, 0x80,
+		0x09, 0x80, 0x83, 0x0a, 0x82, 0x0b, 0x08, 0x81,
+		0x0a, 0x83, 0x80, 0x09, 0x81, 0x08, 0x0b, 0x82,
+		0x0b, 0x82, 0x81, 0x08, 0x80, 0x09, 0x0a, 0x83,
+		0x0b, 0x82, 0x81, 0x08, 0x80, 0x09, 0x0a, 0x83,
+		0x0a, 0x83, 0x80, 0x09, 0x81, 0x08, 0x0b, 0x82,
+		0x09, 0x80, 0x83, 0x0a, 0x82, 0x0b, 0x08, 0x81,
+		0x08, 0x81, 0x82, 0x0b, 0x83, 0x0a, 0x09, 0x80,
+		0x09, 0x80, 0x83, 0x0a, 0x82, 0x0b, 0x08, 0x81,
+		0x08, 0x81, 0x82, 0x0b, 0x83, 0x0a, 0x09, 0x80,
+		0x0b, 0x82, 0x81, 0x08, 0x80, 0x09, 0x0a, 0x83,
+		0x0a, 0x83, 0x80, 0x09, 0x81, 0x08, 0x0b, 0x82,
+		0x0a, 0x83, 0x80, 0x09, 0x81, 0x08, 0x0b, 0x82,
+		0x0b, 0x82, 0x81, 0x08, 0x80, 0x09, 0x0a, 0x83,
+		0x08, 0x81, 0x82, 0x0b, 0x83, 0x0a, 0x09, 0x80,
+		0x09, 0x80, 0x83, 0x0a, 0x82, 0x0b, 0x08, 0x81,
+		0x01, 0x88, 0x8b, 0x02, 0x8a, 0x03, 0x00, 0x89,
+		0x00, 0x89, 0x8a, 0x03, 0x8b, 0x02, 0x01, 0x88,
+		0x03, 0x8a, 0x89, 0x00, 0x88, 0x01, 0x02, 0x8b,
+		0x02, 0x8b, 0x88, 0x01, 0x89, 0x00, 0x03, 0x8a,
+		0x02, 0x8b, 0x88, 0x01, 0x89, 0x00, 0x03, 0x8a,
+		0x03, 0x8a, 0x89, 0x00, 0x88, 0x01, 0x02, 0x8b,
+		0x00, 0x89, 0x8a, 0x03, 0x8b, 0x02, 0x01, 0x88,
+		0x01, 0x88, 0x8b, 0x02, 0x8a, 0x03, 0x00, 0x89
+	}
+};
+
+const unsigned char hamming_24_18_forward_2[4] = {
+	0x00, 0x0a, 0x0b, 0x01
+};
+
+
+const unsigned char hamming_24_18_parities[3][256] = {
+	{ // Parities of first byte
+		0x00, 0x21, 0x22, 0x03, 0x23, 0x02, 0x01, 0x20, 
+		0x24, 0x05, 0x06, 0x27, 0x07, 0x26, 0x25, 0x04, 
+		0x25, 0x04, 0x07, 0x26, 0x06, 0x27, 0x24, 0x05, 
+		0x01, 0x20, 0x23, 0x02, 0x22, 0x03, 0x00, 0x21, 
+		0x26, 0x07, 0x04, 0x25, 0x05, 0x24, 0x27, 0x06, 
+		0x02, 0x23, 0x20, 0x01, 0x21, 0x00, 0x03, 0x22, 
+		0x03, 0x22, 0x21, 0x00, 0x20, 0x01, 0x02, 0x23, 
+		0x27, 0x06, 0x05, 0x24, 0x04, 0x25, 0x26, 0x07, 
+		0x27, 0x06, 0x05, 0x24, 0x04, 0x25, 0x26, 0x07, 
+		0x03, 0x22, 0x21, 0x00, 0x20, 0x01, 0x02, 0x23, 
+		0x02, 0x23, 0x20, 0x01, 0x21, 0x00, 0x03, 0x22, 
+		0x26, 0x07, 0x04, 0x25, 0x05, 0x24, 0x27, 0x06, 
+		0x01, 0x20, 0x23, 0x02, 0x22, 0x03, 0x00, 0x21, 
+		0x25, 0x04, 0x07, 0x26, 0x06, 0x27, 0x24, 0x05, 
+		0x24, 0x05, 0x06, 0x27, 0x07, 0x26, 0x25, 0x04, 
+		0x00, 0x21, 0x22, 0x03, 0x23, 0x02, 0x01, 0x20, 
+		0x28, 0x09, 0x0a, 0x2b, 0x0b, 0x2a, 0x29, 0x08, 
+		0x0c, 0x2d, 0x2e, 0x0f, 0x2f, 0x0e, 0x0d, 0x2c, 
+		0x0d, 0x2c, 0x2f, 0x0e, 0x2e, 0x0f, 0x0c, 0x2d, 
+		0x29, 0x08, 0x0b, 0x2a, 0x0a, 0x2b, 0x28, 0x09, 
+		0x0e, 0x2f, 0x2c, 0x0d, 0x2d, 0x0c, 0x0f, 0x2e, 
+		0x2a, 0x0b, 0x08, 0x29, 0x09, 0x28, 0x2b, 0x0a, 
+		0x2b, 0x0a, 0x09, 0x28, 0x08, 0x29, 0x2a, 0x0b, 
+		0x0f, 0x2e, 0x2d, 0x0c, 0x2c, 0x0d, 0x0e, 0x2f, 
+		0x0f, 0x2e, 0x2d, 0x0c, 0x2c, 0x0d, 0x0e, 0x2f, 
+		0x2b, 0x0a, 0x09, 0x28, 0x08, 0x29, 0x2a, 0x0b, 
+		0x2a, 0x0b, 0x08, 0x29, 0x09, 0x28, 0x2b, 0x0a, 
+		0x0e, 0x2f, 0x2c, 0x0d, 0x2d, 0x0c, 0x0f, 0x2e, 
+		0x29, 0x08, 0x0b, 0x2a, 0x0a, 0x2b, 0x28, 0x09, 
+		0x0d, 0x2c, 0x2f, 0x0e, 0x2e, 0x0f, 0x0c, 0x2d, 
+		0x0c, 0x2d, 0x2e, 0x0f, 0x2f, 0x0e, 0x0d, 0x2c, 
+		0x28, 0x09, 0x0a, 0x2b, 0x0b, 0x2a, 0x29, 0x08
+	},
+	{ // Parities of second byte
+		0x00, 0x29, 0x2a, 0x03, 0x2b, 0x02, 0x01, 0x28, 
+		0x2c, 0x05, 0x06, 0x2f, 0x07, 0x2e, 0x2d, 0x04, 
+		0x2d, 0x04, 0x07, 0x2e, 0x06, 0x2f, 0x2c, 0x05, 
+		0x01, 0x28, 0x2b, 0x02, 0x2a, 0x03, 0x00, 0x29, 
+		0x2e, 0x07, 0x04, 0x2d, 0x05, 0x2c, 0x2f, 0x06, 
+		0x02, 0x2b, 0x28, 0x01, 0x29, 0x00, 0x03, 0x2a, 
+		0x03, 0x2a, 0x29, 0x00, 0x28, 0x01, 0x02, 0x2b, 
+		0x2f, 0x06, 0x05, 0x2c, 0x04, 0x2d, 0x2e, 0x07, 
+		0x2f, 0x06, 0x05, 0x2c, 0x04, 0x2d, 0x2e, 0x07, 
+		0x03, 0x2a, 0x29, 0x00, 0x28, 0x01, 0x02, 0x2b, 
+		0x02, 0x2b, 0x28, 0x01, 0x29, 0x00, 0x03, 0x2a, 
+		0x2e, 0x07, 0x04, 0x2d, 0x05, 0x2c, 0x2f, 0x06, 
+		0x01, 0x28, 0x2b, 0x02, 0x2a, 0x03, 0x00, 0x29, 
+		0x2d, 0x04, 0x07, 0x2e, 0x06, 0x2f, 0x2c, 0x05, 
+		0x2c, 0x05, 0x06, 0x2f, 0x07, 0x2e, 0x2d, 0x04, 
+		0x00, 0x29, 0x2a, 0x03, 0x2b, 0x02, 0x01, 0x28, 
+		0x30, 0x19, 0x1a, 0x33, 0x1b, 0x32, 0x31, 0x18, 
+		0x1c, 0x35, 0x36, 0x1f, 0x37, 0x1e, 0x1d, 0x34, 
+		0x1d, 0x34, 0x37, 0x1e, 0x36, 0x1f, 0x1c, 0x35, 
+		0x31, 0x18, 0x1b, 0x32, 0x1a, 0x33, 0x30, 0x19, 
+		0x1e, 0x37, 0x34, 0x1d, 0x35, 0x1c, 0x1f, 0x36, 
+		0x32, 0x1b, 0x18, 0x31, 0x19, 0x30, 0x33, 0x1a, 
+		0x33, 0x1a, 0x19, 0x30, 0x18, 0x31, 0x32, 0x1b, 
+		0x1f, 0x36, 0x35, 0x1c, 0x34, 0x1d, 0x1e, 0x37, 
+		0x1f, 0x36, 0x35, 0x1c, 0x34, 0x1d, 0x1e, 0x37, 
+		0x33, 0x1a, 0x19, 0x30, 0x18, 0x31, 0x32, 0x1b, 
+		0x32, 0x1b, 0x18, 0x31, 0x19, 0x30, 0x33, 0x1a, 
+		0x1e, 0x37, 0x34, 0x1d, 0x35, 0x1c, 0x1f, 0x36, 
+		0x31, 0x18, 0x1b, 0x32, 0x1a, 0x33, 0x30, 0x19, 
+		0x1d, 0x34, 0x37, 0x1e, 0x36, 0x1f, 0x1c, 0x35, 
+		0x1c, 0x35, 0x36, 0x1f, 0x37, 0x1e, 0x1d, 0x34, 
+		0x30, 0x19, 0x1a, 0x33, 0x1b, 0x32, 0x31, 0x18
+	},
+	{ // Parities of third byte
+		0x3f, 0x0e, 0x0d, 0x3c, 0x0c, 0x3d, 0x3e, 0x0f, 
+		0x0b, 0x3a, 0x39, 0x08, 0x38, 0x09, 0x0a, 0x3b, 
+		0x0a, 0x3b, 0x38, 0x09, 0x39, 0x08, 0x0b, 0x3a, 
+		0x3e, 0x0f, 0x0c, 0x3d, 0x0d, 0x3c, 0x3f, 0x0e, 
+		0x09, 0x38, 0x3b, 0x0a, 0x3a, 0x0b, 0x08, 0x39, 
+		0x3d, 0x0c, 0x0f, 0x3e, 0x0e, 0x3f, 0x3c, 0x0d, 
+		0x3c, 0x0d, 0x0e, 0x3f, 0x0f, 0x3e, 0x3d, 0x0c, 
+		0x08, 0x39, 0x3a, 0x0b, 0x3b, 0x0a, 0x09, 0x38, 
+		0x08, 0x39, 0x3a, 0x0b, 0x3b, 0x0a, 0x09, 0x38, 
+		0x3c, 0x0d, 0x0e, 0x3f, 0x0f, 0x3e, 0x3d, 0x0c, 
+		0x3d, 0x0c, 0x0f, 0x3e, 0x0e, 0x3f, 0x3c, 0x0d, 
+		0x09, 0x38, 0x3b, 0x0a, 0x3a, 0x0b, 0x08, 0x39, 
+		0x3e, 0x0f, 0x0c, 0x3d, 0x0d, 0x3c, 0x3f, 0x0e, 
+		0x0a, 0x3b, 0x38, 0x09, 0x39, 0x08, 0x0b, 0x3a, 
+		0x0b, 0x3a, 0x39, 0x08, 0x38, 0x09, 0x0a, 0x3b, 
+		0x3f, 0x0e, 0x0d, 0x3c, 0x0c, 0x3d, 0x3e, 0x0f, 
+		0x1f, 0x2e, 0x2d, 0x1c, 0x2c, 0x1d, 0x1e, 0x2f, 
+		0x2b, 0x1a, 0x19, 0x28, 0x18, 0x29, 0x2a, 0x1b, 
+		0x2a, 0x1b, 0x18, 0x29, 0x19, 0x28, 0x2b, 0x1a, 
+		0x1e, 0x2f, 0x2c, 0x1d, 0x2d, 0x1c, 0x1f, 0x2e, 
+		0x29, 0x18, 0x1b, 0x2a, 0x1a, 0x2b, 0x28, 0x19, 
+		0x1d, 0x2c, 0x2f, 0x1e, 0x2e, 0x1f, 0x1c, 0x2d, 
+		0x1c, 0x2d, 0x2e, 0x1f, 0x2f, 0x1e, 0x1d, 0x2c, 
+		0x28, 0x19, 0x1a, 0x2b, 0x1b, 0x2a, 0x29, 0x18, 
+		0x28, 0x19, 0x1a, 0x2b, 0x1b, 0x2a, 0x29, 0x18, 
+		0x1c, 0x2d, 0x2e, 0x1f, 0x2f, 0x1e, 0x1d, 0x2c, 
+		0x1d, 0x2c, 0x2f, 0x1e, 0x2e, 0x1f, 0x1c, 0x2d, 
+		0x29, 0x18, 0x1b, 0x2a, 0x1a, 0x2b, 0x28, 0x19, 
+		0x1e, 0x2f, 0x2c, 0x1d, 0x2d, 0x1c, 0x1f, 0x2e, 
+		0x2a, 0x1b, 0x18, 0x29, 0x19, 0x28, 0x2b, 0x1a, 
+		0x2b, 0x1a, 0x19, 0x28, 0x18, 0x29, 0x2a, 0x1b, 
+		0x1f, 0x2e, 0x2d, 0x1c, 0x2c, 0x1d, 0x1e, 0x2f
+	}
+};
+
+static const unsigned char hamming_24_18_decode_d1_d4[64] = {
+	0x00, 0x01, 0x00, 0x01, 0x02, 0x03, 0x02, 0x03, 
+	0x04, 0x05, 0x04, 0x05, 0x06, 0x07, 0x06, 0x07, 
+	0x08, 0x09, 0x08, 0x09, 0x0a, 0x0b, 0x0a, 0x0b, 
+	0x0c, 0x0d, 0x0c, 0x0d, 0x0e, 0x0f, 0x0e, 0x0f, 
+	0x00, 0x01, 0x00, 0x01, 0x02, 0x03, 0x02, 0x03, 
+	0x04, 0x05, 0x04, 0x05, 0x06, 0x07, 0x06, 0x07, 
+	0x08, 0x09, 0x08, 0x09, 0x0a, 0x0b, 0x0a, 0x0b, 
+	0x0c, 0x0d, 0x0c, 0x0d, 0x0e, 0x0f, 0x0e, 0x0f
+};
+
+// Mapping from parity checks in hamming_24_18_parities to incorrect bit
+// 0x80000000 - double bit error that can't be corrected
+static const unsigned int hamming_24_18_decode_correct[64] = {
+	0x00000000, 0x80000000, 0x80000000, 0x80000000, 
+	0x80000000, 0x80000000, 0x80000000, 0x80000000, 
+	0x80000000, 0x80000000, 0x80000000, 0x80000000, 
+	0x80000000, 0x80000000, 0x80000000, 0x80000000, 
+	0x80000000, 0x80000000, 0x80000000, 0x80000000, 
+	0x80000000, 0x80000000, 0x80000000, 0x80000000, 
+	0x80000000, 0x80000000, 0x80000000, 0x80000000, 
+	0x80000000, 0x80000000, 0x80000000, 0x80000000, 
+	0x00000000, 0x00000000, 0x00000000, 0x00000001, 
+	0x00000000, 0x00000002, 0x00000004, 0x00000008, 
+	0x00000000, 0x00000010, 0x00000020, 0x00000040, 
+	0x00000080, 0x00000100, 0x00000200, 0x00000400, 
+	0x00000000, 0x00000800, 0x00001000, 0x00002000, 
+	0x00004000, 0x00008000, 0x00010000, 0x00020000, 
+	0x80000000, 0x80000000, 0x80000000, 0x80000000, 
+	0x80000000, 0x80000000, 0x80000000, 0x80000000
+};
+
+#endif

keymap.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *

levelonecommands.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -17,16 +17,29 @@
  * along with QTeletextMaker.  If not, see <https://www.gnu.org/licenses/>.
  */
 
+#include <QApplication>
+#include <QByteArray>
+#include <QByteArrayList>
+#include <QClipboard>
+#include <QMimeData>
+
 #include "levelonecommands.h"
 
 #include "document.h"
+#include "keymap.h"
 
-TypeCharacterCommand::TypeCharacterCommand(TeletextDocument *teletextDocument, unsigned char newCharacter, bool insertMode, QUndoCommand *parent) : QUndoCommand(parent)
+LevelOneCommand::LevelOneCommand(TeletextDocument *teletextDocument, QUndoCommand *parent) : QUndoCommand(parent)
 {
 	m_teletextDocument = teletextDocument;
 	m_subPageIndex = teletextDocument->currentSubPageIndex();
 	m_row = teletextDocument->cursorRow();
-	m_columnStart = m_columnEnd = teletextDocument->cursorColumn();
+	m_column = teletextDocument->cursorColumn();
+	m_firstDo = true;
+}
+
+TypeCharacterCommand::TypeCharacterCommand(TeletextDocument *teletextDocument, unsigned char newCharacter, bool insertMode, QUndoCommand *parent) : LevelOneCommand(teletextDocument, parent)
+{
+	m_columnStart = m_columnEnd = m_column;
 	m_newCharacter = newCharacter;
 	m_insertMode = insertMode;
 
@@ -37,7 +50,6 @@ TypeCharacterCommand::TypeCharacterCommand(TeletextDocument *teletextDocument, u
 		setText(QObject::tr("insert character"));
 	else
 		setText(QObject::tr("overwrite character"));
-	m_firstDo = true;
 }
 
 void TypeCharacterCommand::redo()
@@ -89,12 +101,8 @@ bool TypeCharacterCommand::mergeWith(const QUndoCommand *command)
 }
 
 
-ToggleMosaicBitCommand::ToggleMosaicBitCommand(TeletextDocument *teletextDocument, unsigned char bitToToggle, QUndoCommand *parent) : QUndoCommand(parent)
+ToggleMosaicBitCommand::ToggleMosaicBitCommand(TeletextDocument *teletextDocument, unsigned char bitToToggle, QUndoCommand *parent) : LevelOneCommand(teletextDocument, parent)
 {
-	m_teletextDocument = teletextDocument;
-	m_subPageIndex = teletextDocument->currentSubPageIndex();
-	m_row = teletextDocument->cursorRow();
-	m_column = teletextDocument->cursorColumn();
 	m_oldCharacter = teletextDocument->currentSubPage()->character(m_row, m_column);
 	if (bitToToggle == 0x20 || bitToToggle == 0x7f)
 		m_newCharacter = bitToToggle;
@@ -134,12 +142,10 @@ bool ToggleMosaicBitCommand::mergeWith(const QUndoCommand *command)
 }
 
 
-BackspaceKeyCommand::BackspaceKeyCommand(TeletextDocument *teletextDocument, bool insertMode, QUndoCommand *parent) : QUndoCommand(parent)
+BackspaceKeyCommand::BackspaceKeyCommand(TeletextDocument *teletextDocument, bool insertMode, QUndoCommand *parent) : LevelOneCommand(teletextDocument, parent)
 {
-	m_teletextDocument = teletextDocument;
-	m_subPageIndex = teletextDocument->currentSubPageIndex();
-	m_row = teletextDocument->cursorRow();
-	m_columnStart = teletextDocument->cursorColumn()-1;
+	m_columnStart = m_column - 1;
+
 	if (m_columnStart == -1) {
 		m_columnStart = 39;
 		if (--m_row == 0)
@@ -152,7 +158,6 @@ BackspaceKeyCommand::BackspaceKeyCommand(TeletextDocument *teletextDocument, boo
 		m_oldRowContents[c] = m_newRowContents[c] = m_teletextDocument->currentSubPage()->character(m_row, c);
 
 	setText(QObject::tr("backspace"));
-	m_firstDo = true;
 }
 
 void BackspaceKeyCommand::redo()
@@ -208,13 +213,8 @@ bool BackspaceKeyCommand::mergeWith(const QUndoCommand *command)
 }
 
 
-DeleteKeyCommand::DeleteKeyCommand(TeletextDocument *teletextDocument, QUndoCommand *parent) : QUndoCommand(parent)
+DeleteKeyCommand::DeleteKeyCommand(TeletextDocument *teletextDocument, QUndoCommand *parent) : LevelOneCommand(teletextDocument, parent)
 {
-	m_teletextDocument = teletextDocument;
-	m_subPageIndex = teletextDocument->currentSubPageIndex();
-	m_row = teletextDocument->cursorRow();
-	m_column = teletextDocument->cursorColumn();
-
 	for (int c=0; c<40; c++)
 		m_oldRowContents[c] = m_newRowContents[c] = m_teletextDocument->currentSubPage()->character(m_row, c);
 
@@ -262,11 +262,8 @@ bool DeleteKeyCommand::mergeWith(const QUndoCommand *command)
 }
 
 
-InsertRowCommand::InsertRowCommand(TeletextDocument *teletextDocument, bool copyRow, QUndoCommand *parent) : QUndoCommand(parent)
+InsertRowCommand::InsertRowCommand(TeletextDocument *teletextDocument, bool copyRow, QUndoCommand *parent) : LevelOneCommand(teletextDocument, parent)
 {
-	m_teletextDocument = teletextDocument;
-	m_subPageIndex = teletextDocument->currentSubPageIndex();
-	m_row = teletextDocument->cursorRow();
 	m_copyRow = copyRow;
 
 	if (m_copyRow)
@@ -310,12 +307,8 @@ void InsertRowCommand::undo()
 }
 
 
-DeleteRowCommand::DeleteRowCommand(TeletextDocument *teletextDocument, QUndoCommand *parent) : QUndoCommand(parent)
+DeleteRowCommand::DeleteRowCommand(TeletextDocument *teletextDocument, QUndoCommand *parent) : LevelOneCommand(teletextDocument, parent)
 {
-	m_teletextDocument = teletextDocument;
-	m_subPageIndex = teletextDocument->currentSubPageIndex();
-	m_row = teletextDocument->cursorRow();
-
 	setText(QObject::tr("delete row"));
 }
 
@@ -354,10 +347,233 @@ void DeleteRowCommand::undo()
 }
 
 
-InsertSubPageCommand::InsertSubPageCommand(TeletextDocument *teletextDocument, bool afterCurrentSubPage, bool copySubPage, QUndoCommand *parent) : QUndoCommand(parent)
+#ifndef QT_NO_CLIPBOARD
+CutCommand::CutCommand(TeletextDocument *teletextDocument, QUndoCommand *parent) : LevelOneCommand(teletextDocument, parent)
 {
-	m_teletextDocument = teletextDocument;
-	m_newSubPageIndex = teletextDocument->currentSubPageIndex()+afterCurrentSubPage;
+	m_selectionTopRow = m_teletextDocument->selectionTopRow();
+	m_selectionBottomRow = m_teletextDocument->selectionBottomRow();
+	m_selectionLeftColumn = m_teletextDocument->selectionLeftColumn();
+	m_selectionRightColumn = m_teletextDocument->selectionRightColumn();
+
+	m_selectionCornerRow = m_teletextDocument->selectionCornerRow();
+	m_selectionCornerColumn = m_teletextDocument->selectionCornerColumn();
+
+	// Store copy of the characters that we're about to blank
+	for (int r=m_selectionTopRow; r<=m_selectionBottomRow; r++) {
+		QByteArray rowArray;
+
+		for (int c=m_selectionLeftColumn; c<=m_selectionRightColumn; c++)
+			rowArray.append(m_teletextDocument->currentSubPage()->character(r, c));
+
+		m_deletedCharacters.append(rowArray);
+	}
+
+	setText(QObject::tr("cut"));
+}
+
+void CutCommand::redo()
+{
+	m_teletextDocument->selectSubPageIndex(m_subPageIndex);
+
+	for (int r=m_selectionTopRow; r<=m_selectionBottomRow; r++) {
+		for (int c=m_selectionLeftColumn; c<=m_selectionRightColumn; c++)
+			m_teletextDocument->currentSubPage()->setCharacter(r, c, 0x20);
+		emit m_teletextDocument->contentsChange(r);
+	}
+}
+
+void CutCommand::undo()
+{
+	m_teletextDocument->selectSubPageIndex(m_subPageIndex);
+
+	int arrayR = 0;
+	int arrayC;
+
+	for (int r=m_selectionTopRow; r<=m_selectionBottomRow; r++) {
+		arrayC = 0;
+		for (int c=m_selectionLeftColumn; c<=m_selectionRightColumn; c++)
+			m_teletextDocument->currentSubPage()->setCharacter(r, c, m_deletedCharacters[arrayR].at(arrayC++));
+
+		emit m_teletextDocument->contentsChange(r);
+		arrayR++;
+	}
+
+	m_teletextDocument->setSelectionCorner(m_selectionCornerRow, m_selectionCornerColumn);
+	m_teletextDocument->moveCursor(m_row, m_column, true);
+}
+
+
+PasteCommand::PasteCommand(TeletextDocument *teletextDocument, int pageCharSet, QUndoCommand *parent) : LevelOneCommand(teletextDocument, parent)
+{
+	const QClipboard *clipboard = QApplication::clipboard();
+	const QMimeData *mimeData = clipboard->mimeData();
+	QByteArray nativeData;
+
+	m_selectionActive = m_teletextDocument->selectionActive();
+	if (m_selectionActive) {
+		m_selectionCornerRow = m_teletextDocument->selectionCornerRow();
+		m_selectionCornerColumn = m_teletextDocument->selectionCornerColumn();
+	}
+
+	m_clipboardDataHeight = m_clipboardDataWidth = 0;
+
+	// Try to get something from the clipboard
+	// FIXME is this a correct "custom" mime type? Or should we use vnd?
+	nativeData = mimeData->data("application/x-teletext");
+	if (nativeData.size() > 2) {
+		// Native clipboard data: we put it there ourselves
+		m_clipboardDataHeight = nativeData.at(0);
+		m_clipboardDataWidth = nativeData.at(1);
+
+		// Guard against invalid dimensions or total size not matching stated dimensions
+		if (m_clipboardDataHeight > 0 && m_clipboardDataWidth > 0 && m_clipboardDataHeight <= 25 && m_clipboardDataWidth <= 40 && nativeData.size() == m_clipboardDataHeight * m_clipboardDataWidth + 2)
+			for (int r=0; r<m_clipboardDataHeight; r++)
+				m_pastingCharacters.append(nativeData.mid(2 + r * m_clipboardDataWidth, m_clipboardDataWidth));
+		else
+			// Invalidate
+			m_clipboardDataHeight = m_clipboardDataWidth = 0;
+	} else if (mimeData->hasText()) {
+		// Plain text
+		QStringList plainTextData = mimeData->text().split(QRegExp("\n|\r\n|\r"));
+
+		m_clipboardDataHeight = plainTextData.size();
+		m_clipboardDataWidth = 0;
+
+		for (int r=0; r<m_clipboardDataHeight; r++) {
+			m_pastingCharacters.append(QByteArray());
+			for (int c=0; c<plainTextData.at(r).size(); c++) {
+				// Try to map the unicode character to the current Level 1 character set of this page
+
+				char convertedChar;
+				const QChar charToConvert = plainTextData.at(r).at(c);
+
+				if (keymapping[pageCharSet].contains(charToConvert))
+					// Remapped character or non-Latin character converted successfully
+					convertedChar = keymapping[pageCharSet].value(charToConvert);
+				else {
+					// Either a Latin character or non-Latin character that can't be converted
+					// See if it's a Latin character
+					convertedChar = charToConvert.toLatin1();
+					if (convertedChar == 0)
+						// Couldn't convert - make it a block character so it doesn't need to be inserted-between later on
+						convertedChar = 0x7f;
+				}
+
+				m_pastingCharacters[r].append(convertedChar);
+			}
+			m_clipboardDataWidth = qMax(m_pastingCharacters.at(r).size(), m_clipboardDataWidth);
+		}
+		// Pad short lines with spaces to make a box
+		for (int r=0; r<m_clipboardDataHeight; r++)
+			m_pastingCharacters[r] = m_pastingCharacters.at(r).leftJustified(m_clipboardDataWidth);
+	}
+
+	if (m_clipboardDataWidth == 0 || m_clipboardDataHeight == 0)
+		return;
+
+	if (m_selectionActive) {
+		m_pasteTopRow = m_teletextDocument->selectionTopRow();
+		m_pasteBottomRow = m_teletextDocument->selectionBottomRow();
+		m_pasteLeftColumn = m_teletextDocument->selectionLeftColumn();
+		m_pasteRightColumn = m_teletextDocument->selectionRightColumn();
+	} else {
+		m_pasteTopRow = m_row;
+		m_pasteBottomRow = m_row + m_clipboardDataHeight - 1;
+		m_pasteLeftColumn = m_column;
+		m_pasteRightColumn = m_column + m_clipboardDataWidth - 1;
+	}
+
+	// Store copy of the characters that we're about to overwrite
+	for (int r=m_pasteTopRow; r<=m_pasteBottomRow; r++) {
+		QByteArray rowArray;
+
+		for (int c=m_pasteLeftColumn; c<=m_pasteRightColumn; c++)
+			// Guard against size of pasted block going beyond last line or column
+			if (r < 25 && c < 40)
+				rowArray.append(m_teletextDocument->currentSubPage()->character(r, c));
+			else
+				// Gone beyond last line or column - store a filler character which we won't see
+				// Not sure if this is really necessary as out-of-bounds access might not occur?
+				rowArray.append(0x7f);
+
+		m_deletedCharacters.append(rowArray);
+	}
+
+	setText(QObject::tr("paste"));
+}
+
+void PasteCommand::redo()
+{
+	if (m_clipboardDataWidth == 0 || m_clipboardDataHeight == 0)
+		return;
+
+	m_teletextDocument->selectSubPageIndex(m_subPageIndex);
+
+	int arrayR = 0;
+	int arrayC;
+
+	for (int r=m_pasteTopRow; r<=m_pasteBottomRow; r++) {
+		arrayC = 0;
+		for (int c=m_pasteLeftColumn; c<=m_pasteRightColumn; c++)
+			// Guard against size of pasted block going beyond last line or column
+			if (r < 25 && c < 40) {
+				m_teletextDocument->currentSubPage()->setCharacter(r, c, m_pastingCharacters[arrayR].at(arrayC++));
+
+				// If paste area is wider than clipboard data, repeat the pattern
+				if (arrayC == m_clipboardDataWidth)
+					arrayC = 0;
+			}
+
+		if (r < 25)
+			emit m_teletextDocument->contentsChange(r);
+
+		arrayR++;
+		// If paste area is taller than clipboard data, repeat the pattern
+		if (arrayR == m_clipboardDataHeight)
+			arrayR = 0;
+	}
+
+	if (m_selectionActive) {
+		m_teletextDocument->setSelectionCorner(m_selectionCornerRow, m_selectionCornerColumn);
+		m_teletextDocument->moveCursor(m_row, m_column, true);
+	} else {
+		m_teletextDocument->moveCursor(m_row, qMin(m_column+m_clipboardDataWidth-1, 39));
+		m_teletextDocument->cursorRight();
+	}
+}
+
+void PasteCommand::undo()
+{
+	if (m_clipboardDataWidth == 0 || m_clipboardDataHeight == 0)
+		return;
+
+	m_teletextDocument->selectSubPageIndex(m_subPageIndex);
+
+	int arrayR = 0;
+	int arrayC;
+
+	for (int r=m_pasteTopRow; r<=m_pasteBottomRow; r++) {
+		arrayC = 0;
+		for (int c=m_pasteLeftColumn; c<=m_pasteRightColumn; c++)
+			// Guard against size of pasted block going beyond last line or column
+			if (r < 25 && c < 40)
+				m_teletextDocument->currentSubPage()->setCharacter(r, c, m_deletedCharacters[arrayR].at(arrayC++));
+
+		if (r < 25)
+			emit m_teletextDocument->contentsChange(r);
+
+		arrayR++;
+	}
+
+	if (!m_selectionActive)
+		m_teletextDocument->moveCursor(m_row, m_column);
+}
+#endif // !QT_NO_CLIPBOARD
+
+
+InsertSubPageCommand::InsertSubPageCommand(TeletextDocument *teletextDocument, bool afterCurrentSubPage, bool copySubPage, QUndoCommand *parent) : LevelOneCommand(teletextDocument, parent)
+{
+	m_newSubPageIndex = m_subPageIndex + afterCurrentSubPage;
 	m_copySubPage = copySubPage;
 
 	setText(QObject::tr("insert subpage"));
@@ -380,30 +596,26 @@ void InsertSubPageCommand::undo()
 }
 
 
-DeleteSubPageCommand::DeleteSubPageCommand(TeletextDocument *teletextDocument, QUndoCommand *parent) : QUndoCommand(parent)
+DeleteSubPageCommand::DeleteSubPageCommand(TeletextDocument *teletextDocument, QUndoCommand *parent) : LevelOneCommand(teletextDocument, parent)
 {
-	m_teletextDocument = teletextDocument;
-	m_subPageToDelete = teletextDocument->currentSubPageIndex();
 	setText(QObject::tr("delete subpage"));
 }
 
 void DeleteSubPageCommand::redo()
 {
-	m_teletextDocument->deleteSubPageToRecycle(m_subPageToDelete);
-	m_teletextDocument->selectSubPageIndex(qMin(m_subPageToDelete, m_teletextDocument->numberOfSubPages()-1), true);
+	m_teletextDocument->deleteSubPageToRecycle(m_subPageIndex);
+	m_teletextDocument->selectSubPageIndex(qMin(m_subPageIndex, m_teletextDocument->numberOfSubPages()-1), true);
 }
 
 void DeleteSubPageCommand::undo()
 {
-	m_teletextDocument->unDeleteSubPageFromRecycle(m_subPageToDelete);
-	m_teletextDocument->selectSubPageIndex(m_subPageToDelete, true);
+	m_teletextDocument->unDeleteSubPageFromRecycle(m_subPageIndex);
+	m_teletextDocument->selectSubPageIndex(m_subPageIndex, true);
 }
 
 
-SetColourCommand::SetColourCommand(TeletextDocument *teletextDocument, int colourIndex, int newColour, QUndoCommand *parent) : QUndoCommand(parent)
+SetColourCommand::SetColourCommand(TeletextDocument *teletextDocument, int colourIndex, int newColour, QUndoCommand *parent) : LevelOneCommand(teletextDocument, parent)
 {
-	m_teletextDocument = teletextDocument;
-	m_subPageIndex = teletextDocument->currentSubPageIndex();
 	m_colourIndex = colourIndex;
 	m_oldColour = teletextDocument->currentSubPage()->CLUT(colourIndex);
 	m_newColour = newColour;
@@ -431,10 +643,8 @@ void SetColourCommand::undo()
 }
 
 
-ResetCLUTCommand::ResetCLUTCommand(TeletextDocument *teletextDocument, int colourTable, QUndoCommand *parent) : QUndoCommand(parent)
+ResetCLUTCommand::ResetCLUTCommand(TeletextDocument *teletextDocument, int colourTable, QUndoCommand *parent) : LevelOneCommand(teletextDocument, parent)
 {
-	m_teletextDocument = teletextDocument;
-	m_subPageIndex = teletextDocument->currentSubPageIndex();
 	m_colourTable = colourTable;
 	for (int i=m_colourTable*8; i<m_colourTable*8+8; i++)
 		m_oldColourEntry[i&7] = teletextDocument->currentSubPage()->CLUT(i);

levelonecommands.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -20,11 +20,23 @@
 #ifndef LEVELONECOMMANDS_H
 #define LEVELONECOMMANDS_H
 
+#include <QByteArrayList>
 #include <QUndoCommand>
 
 #include "document.h"
 
-class TypeCharacterCommand : public QUndoCommand
+class LevelOneCommand : public QUndoCommand
+{
+public:
+	LevelOneCommand(TeletextDocument *, QUndoCommand *parent = 0);
+
+protected:
+	TeletextDocument *m_teletextDocument;
+	int m_subPageIndex, m_row, m_column;
+	bool m_firstDo;
+};
+
+class TypeCharacterCommand : public LevelOneCommand
 {
 public:
 	enum { Id = 101 };
@@ -37,13 +49,12 @@ public:
 	int id() const override { return Id; }
 
 private:
-	TeletextDocument *m_teletextDocument;
 	unsigned char m_newCharacter, m_oldRowContents[40], m_newRowContents[40];
-	int m_subPageIndex, m_row, m_columnStart, m_columnEnd;
-	bool m_firstDo, m_insertMode;
+	int m_columnStart, m_columnEnd;
+	bool m_insertMode;
 };
 
-class ToggleMosaicBitCommand : public QUndoCommand
+class ToggleMosaicBitCommand : public LevelOneCommand
 {
 public:
 	enum { Id = 102 };
@@ -56,12 +67,10 @@ public:
 	int id() const override { return Id; }
 
 private:
-	TeletextDocument *m_teletextDocument;
 	unsigned char m_oldCharacter, m_newCharacter;
-	int m_subPageIndex, m_row, m_column;
 };
 
-class BackspaceKeyCommand : public QUndoCommand
+class BackspaceKeyCommand : public LevelOneCommand
 {
 public:
 	enum { Id = 103 };
@@ -74,13 +83,12 @@ public:
 	int id() const override { return Id; }
 
 private:
-	TeletextDocument *m_teletextDocument;
 	unsigned char m_oldRowContents[40], m_newRowContents[40];
-	int m_subPageIndex, m_row, m_columnStart, m_columnEnd;
-	bool m_firstDo, m_insertMode;
+	int m_columnStart, m_columnEnd;
+	bool m_insertMode;
 };
 
-class DeleteKeyCommand : public QUndoCommand
+class DeleteKeyCommand : public LevelOneCommand
 {
 public:
 	enum { Id = 104 };
@@ -93,12 +101,10 @@ public:
 	int id() const override { return Id; }
 
 private:
-	TeletextDocument *m_teletextDocument;
 	unsigned char m_oldRowContents[40], m_newRowContents[40];
-	int m_subPageIndex, m_row, m_column;
 };
 
-class InsertSubPageCommand : public QUndoCommand
+class InsertSubPageCommand : public LevelOneCommand
 {
 public:
 	InsertSubPageCommand(TeletextDocument *, bool, bool, QUndoCommand *parent = 0);
@@ -107,25 +113,20 @@ public:
 	void undo() override;
 
 private:
-	TeletextDocument *m_teletextDocument;
 	int m_newSubPageIndex;
 	bool m_copySubPage;
 };
 
-class DeleteSubPageCommand : public QUndoCommand
+class DeleteSubPageCommand : public LevelOneCommand
 {
 public:
 	DeleteSubPageCommand(TeletextDocument *, QUndoCommand *parent = 0);
 
 	void redo() override;
 	void undo() override;
-
-private:
-	TeletextDocument *m_teletextDocument;
-	int m_subPageToDelete;
 };
 
-class InsertRowCommand : public QUndoCommand
+class InsertRowCommand : public LevelOneCommand
 {
 public:
 	InsertRowCommand(TeletextDocument *, bool, QUndoCommand *parent = 0);
@@ -134,13 +135,11 @@ public:
 	void undo() override;
 
 private:
-	TeletextDocument *m_teletextDocument;
-	int m_subPageIndex, m_row;
 	bool m_copyRow;
 	unsigned char m_deletedBottomRow[40];
 };
 
-class DeleteRowCommand : public QUndoCommand
+class DeleteRowCommand : public LevelOneCommand
 {
 public:
 	DeleteRowCommand(TeletextDocument *, QUndoCommand *parent = 0);
@@ -149,12 +148,42 @@ public:
 	void undo() override;
 
 private:
-	TeletextDocument *m_teletextDocument;
-	int m_subPageIndex, m_row;
 	unsigned char m_deletedRow[40];
 };
 
-class SetColourCommand : public QUndoCommand
+#ifndef QT_NO_CLIPBOARD
+class CutCommand : public LevelOneCommand
+{
+public:
+	CutCommand(TeletextDocument *, QUndoCommand *parent = 0);
+
+	void redo() override;
+	void undo() override;
+
+private:
+	QByteArrayList m_deletedCharacters;
+	int m_selectionTopRow, m_selectionBottomRow, m_selectionLeftColumn, m_selectionRightColumn;
+	int m_selectionCornerRow, m_selectionCornerColumn;
+};
+
+class PasteCommand : public LevelOneCommand
+{
+public:
+	PasteCommand(TeletextDocument *, int, QUndoCommand *parent = 0);
+
+	void redo() override;
+	void undo() override;
+
+private:
+	QByteArrayList m_deletedCharacters, m_pastingCharacters;
+	int m_pasteTopRow, m_pasteBottomRow, m_pasteLeftColumn, m_pasteRightColumn;
+	int m_clipboardDataHeight, m_clipboardDataWidth;
+	int m_selectionCornerRow, m_selectionCornerColumn;
+	bool m_selectionActive;
+};
+#endif // !QT_NO_CLIPBOARD
+
+class SetColourCommand : public LevelOneCommand
 {
 public:
 	SetColourCommand(TeletextDocument *, int, int, QUndoCommand *parent = 0);
@@ -163,11 +192,10 @@ public:
 	void undo() override;
 
 private:
-	TeletextDocument *m_teletextDocument;
-	int m_subPageIndex, m_colourIndex, m_oldColour, m_newColour;
+	int m_colourIndex, m_oldColour, m_newColour;
 };
 
-class ResetCLUTCommand : public QUndoCommand
+class ResetCLUTCommand : public LevelOneCommand
 {
 public:
 	ResetCLUTCommand(TeletextDocument *, int, QUndoCommand *parent = 0);
@@ -176,8 +204,7 @@ public:
 	void undo() override;
 
 private:
-	TeletextDocument *m_teletextDocument;
-	int m_subPageIndex, m_colourTable;
+	int m_colourTable;
 	int m_oldColourEntry[8];
 };
 

levelonepage.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -27,21 +27,21 @@
 
 LevelOnePage::LevelOnePage()
 {
-	m_enhancements.reserve(208);
+	m_enhancements.reserve(maxEnhancements());
 	clearPage();
 }
 
 LevelOnePage::LevelOnePage(const PageBase &other)
 {
-	m_enhancements.reserve(208);
+	m_enhancements.reserve(maxEnhancements());
 	clearPage();
 
 	for (int i=0; i<26; i++)
-		if (other.packetNeeded(i))
+		if (other.packetExists(i))
 			setPacket(i, other.packet(i));
 	for (int i=26; i<30; i++)
 		for (int j=0; j<16; j++)
-			if (other.packetNeeded(i, j))
+			if (other.packetExists(i, j))
 				setPacket(i, j, other.packet(i));
 
 	for (int i=PageBase::C4ErasePage; i<=PageBase::C14NOS; i++)
@@ -125,12 +125,12 @@ QByteArray LevelOnePage::packet(int packetNumber, int designationCode) const
 			result[i*6+1] = m_fastTextLink[i].pageNumber & 0x00f;
 			result[i*6+2] = (m_fastTextLink[i].pageNumber & 0x0f0) >> 4;
 			result[i*6+3] = m_fastTextLink[i].subPageNumber & 0x000f;
-			result[i*6+4] = ((m_fastTextLink[i].subPageNumber & 0x0070) >> 4) | ((m_fastTextLink[i].pageNumber & 0x100) >> 8);
+			result[i*6+4] = ((m_fastTextLink[i].subPageNumber & 0x0070) >> 4) | ((m_fastTextLink[i].pageNumber & 0x100) >> 5);
 			result[i*6+5] = (m_fastTextLink[i].subPageNumber & 0x0f00) >> 8;
 			result[i*6+6] = ((m_fastTextLink[i].subPageNumber & 0x3000) >> 12) | ((m_fastTextLink[i].pageNumber & 0x600) >> 7);
 		}
-		result[43] = 0xf;
-		result[44] = result[45] = 0;
+		result[37] = 0xf;
+		result[38] = result[39] = 0;
 
 		return result;
 	}
@@ -254,7 +254,7 @@ bool LevelOnePage::setPacket(int packetNumber, int designationCode, QByteArray p
 	return PageBase::setPacket(packetNumber, designationCode, packetContents);
 }
 
-bool LevelOnePage::packetNeeded(int packetNumber) const
+bool LevelOnePage::packetExists(int packetNumber) const
 {
 	if (packetNumber <= 24) {
 		for (int c=0; c<40; c++)
@@ -263,10 +263,10 @@ bool LevelOnePage::packetNeeded(int packetNumber) const
 		return false;
 	}
 
-	return PageBase::packetNeeded(packetNumber);
+	return PageBase::packetExists(packetNumber);
 }
 
-bool LevelOnePage::packetNeeded(int packetNumber, int designationCode) const
+bool LevelOnePage::packetExists(int packetNumber, int designationCode) const
 {
 	if (packetNumber == 26)
 		return packetFromEnhancementListNeeded(designationCode);
@@ -298,7 +298,7 @@ bool LevelOnePage::packetNeeded(int packetNumber, int designationCode) const
 			return !isPaletteDefault(0,15);
 	}
 
-	return PageBase::packetNeeded(packetNumber, designationCode);
+	return PageBase::packetExists(packetNumber, designationCode);
 }
 
 bool LevelOnePage::controlBit(int bitNumber) const

levelonepage.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -42,8 +42,8 @@ public:
 
 	QByteArray packet(int) const override;
 	QByteArray packet(int, int) const override;
-	bool packetNeeded(int) const override;
-	bool packetNeeded(int, int) const override;
+	bool packetExists(int) const override;
+	bool packetExists(int, int) const override;
 	bool setPacket(int, QByteArray) override;
 	bool setPacket(int, int, QByteArray) override;
 
@@ -52,6 +52,8 @@ public:
 
 	void clearPage();
 
+	int maxEnhancements() const { return 208; };
+
 /*	void setSubPageNumber(int); */
 	int cycleValue() const { return m_cycleValue; };
 	void setCycleValue(int);

loadsave.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -20,12 +20,14 @@
 #include "loadsave.h"
 
 #include <QByteArray>
+#include <QDataStream>
 #include <QFile>
 #include <QSaveFile>
 #include <QString>
 #include <QTextStream>
 
 #include "document.h"
+#include "hamming.h"
 #include "levelonepage.h"
 #include "pagebase.h"
 
@@ -52,7 +54,7 @@ void loadTTI(QFile *inFile, TeletextDocument *document)
 				document->insertSubPage(document->numberOfSubPages(), false);
 				loadingPage = document->subPage(document->numberOfSubPages()-1);
 			} else {
-				document->setPageNumber(inLine.mid(3,3));
+				document->setPageNumberFromString(inLine.mid(3,3));
 				firstSubPageAlreadyFound = true;
 			}
 		}
@@ -146,6 +148,12 @@ void loadTTI(QFile *inFile, TeletextDocument *document)
 					}
 					for (int i=1; i<=39; i++)
 						inLine[i] = inLine.at(i) & 0x3f;
+					// Import M/29 whole-magazine packets as X/28 per-page packets
+					if (lineNumber == 29) {
+						if ((document->pageNumber() & 0xff) != 0xff)
+							qDebug("M/29/%d packet found, but page number is not xFF!", designationCode);
+						lineNumber = 28;
+					}
 					loadingPage->setPacket(lineNumber, designationCode, inLine);
 				}
 			}
@@ -160,6 +168,198 @@ void loadTTI(QFile *inFile, TeletextDocument *document)
 		}
 }
 
+void importT42(QFile *inFile, TeletextDocument *document)
+{
+	unsigned char inLine[42];
+	int readMagazineNumber, readPacketNumber;
+	int foundMagazineNumber = -1;
+	int foundPageNumber = -1;
+	bool firstPacket0Found = false;
+	bool pageBodyPacketsFound = false;
+
+	for (;;) {
+		if (inFile->read((char *)inLine, 42) != 42)
+			// Reached end of .t42 file, or less than 42 bytes left
+			break;
+
+		// Magazine and packet numbers
+		inLine[0] = hamming_8_4_decode[inLine[0]];
+		inLine[1] = hamming_8_4_decode[inLine[1]];
+		if (inLine[0] == 0xff || inLine[1] == 0xff)
+			// Error decoding magazine or packet number
+			continue;
+		readMagazineNumber = inLine[0] & 0x07;
+		readPacketNumber = (inLine[0] >> 3) | (inLine[1] << 1);
+
+		if (readPacketNumber == 0) {
+			// Hamming decode page number, subcodes and control bits
+			for (int i=2; i<10; i++)
+				inLine[i] = hamming_8_4_decode[inLine[i]];
+			// See if the page number is valid
+			if (inLine[2] == 0xff || inLine[3] == 0xff)
+				// Error decoding page number
+				continue;
+
+			const int readPageNumber = (inLine[3] << 4) | inLine[2];
+
+			if (readPageNumber == 0xff)
+				// Time filling header
+				continue;
+
+			// A second or subsequent X/0 has been found
+			if (firstPacket0Found) {
+				if (readMagazineNumber != foundMagazineNumber)
+					// Packet from different magazine broadcast in parallel mode
+					continue;
+				if ((readPageNumber == foundPageNumber) && pageBodyPacketsFound)
+					// X/0 with same page number found after page body packets loaded - assume end of page
+					break;
+				if (readPageNumber != foundPageNumber) {
+					// More than one page in .t42 file - end of current page reached
+					qDebug("More than one page in .t42 file");
+					break;
+				}
+				// Could get here if X/0 with same page number was found with no body packets inbetween
+				continue;
+			} else {
+				// First X/0 found
+				foundMagazineNumber = readMagazineNumber;
+				foundPageNumber = readPageNumber;
+				firstPacket0Found = true;
+
+				if (foundMagazineNumber == 0)
+					document->setPageNumber(0x800 | foundPageNumber);
+				else
+					document->setPageNumber((foundMagazineNumber << 8) | foundPageNumber);
+
+				document->subPage(0)->setControlBit(PageBase::C4ErasePage, inLine[5] & 0x08);
+				document->subPage(0)->setControlBit(PageBase::C5Newsflash, inLine[7] & 0x04);
+				document->subPage(0)->setControlBit(PageBase::C6Subtitle, inLine[7] & 0x08);
+				for (int i=0; i<4; i++)
+					document->subPage(0)->setControlBit(PageBase::C7SuppressHeader+i, inLine[8] & (1 << i));
+				document->subPage(0)->setControlBit(PageBase::C11SerialMagazine, inLine[9] & 0x01);
+				document->subPage(0)->setControlBit(PageBase::C12NOS, inLine[9] & 0x08);
+				document->subPage(0)->setControlBit(PageBase::C13NOS, inLine[9] & 0x04);
+				document->subPage(0)->setControlBit(PageBase::C14NOS, inLine[9] & 0x02);
+
+				continue;
+			}
+		}
+
+		// No X/0 has been found yet, keep looking for one
+		if (!firstPacket0Found)
+			continue;
+
+		// Disregard whole-magazine packets
+		if (readPacketNumber > 28)
+			continue;
+
+		// We get here when a page-body packet belonging to the found X/0 header was found
+		pageBodyPacketsFound = true;
+
+		// At the moment this only loads a Level One Page properly
+		// because it assumes X/1 to X/25 is odd partity
+		if (readPacketNumber < 25) {
+			for (int i=2; i<42; i++)
+				// TODO - obey odd parity?
+				inLine[i] &= 0x7f;
+			document->subPage(0)->setPacket(readPacketNumber, QByteArray((const char *)&inLine[2], 40));
+			continue;
+		}
+
+		// X/26, X/27 or X/28
+		int readDesignationCode = hamming_8_4_decode[inLine[2]];
+
+		if (readDesignationCode == 0xff)
+			// Error decoding designation code
+			continue;
+
+		if (readPacketNumber == 27 && readDesignationCode < 4) {
+			// X/27/0 to X/27/3 for Editorial Linking
+			// Decode Hamming 8/4 on each of the six links, checking for errors on the way
+			for (int i=0; i<6; i++) {
+				bool decodingError = false;
+				const int b = 3 + i*6; // First byte of this link
+
+				for (int j=0; j<6; j++) {
+					inLine[b+j] = hamming_8_4_decode[inLine[b+j]];
+					if (inLine[b+j] == 0xff) {
+						decodingError = true;
+						break;
+					}
+				}
+
+				if (decodingError) {
+					// Error found in at least one byte of the link
+					// Neutralise the whole link to same magazine, page FF, subcode 3F7F
+					qDebug("X/27/%d link %d decoding error", readDesignationCode, i);
+					inLine[b]   = 0xf;
+					inLine[b+1] = 0xf;
+					inLine[b+2] = 0xf;
+					inLine[b+3] = 0x7;
+					inLine[b+4] = 0xf;
+					inLine[b+5] = 0x3;
+				}
+			}
+			document->subPage(0)->setPacket(readPacketNumber, readDesignationCode, QByteArray((const char *)&inLine[2], 40));
+
+			continue;
+		}
+
+		// X/26, or X/27/4 to X/27/15, or X/28
+		// Decode Hamming 24/18
+		for (int i=0; i<13; i++) {
+			const int b = 3 + i*3; // First byte of triplet
+
+			const int p0 = inLine[b];
+			const int p1 = inLine[b+1];
+			const int p2 = inLine[b+2];
+
+			unsigned int D1_D4;
+			unsigned int D5_D11;
+			unsigned int D12_D18;
+			unsigned int ABCDEF;
+			int32_t d;
+
+			D1_D4 = hamming_24_18_decode_d1_d4[p0 >> 2];
+			D5_D11 = p1 & 0x7f;
+			D12_D18 = p2 & 0x7f;
+
+			d = D1_D4 | (D5_D11 << 4) | (D12_D18 << 11);
+
+			ABCDEF = (hamming_24_18_parities[0][p0] ^ hamming_24_18_parities[1][p1]  ^ hamming_24_18_parities[2][p2]);
+
+			d ^= (int)hamming_24_18_decode_correct[ABCDEF];
+
+			if ((d & 0x80000000) == 0x80000000) {
+				// Error decoding Hamming 24/18
+				qDebug("X/%d/%d triplet %d decoding error", readPacketNumber, readDesignationCode, i);
+				if (readPacketNumber == 26) {
+					// Enhancements packet, set to "dummy" Address 41, Mode 0x1e, Data 0
+					inLine[b]   = 41;
+					inLine[b+1] = 0x1e;
+					inLine[b+2] = 0;
+				} else {
+					// Zero out whole decoded triplet, bound to make things go wrong...
+					inLine[b]   = 0x00;
+					inLine[b+1] = 0x00;
+					inLine[b+2] = 0x00;
+				}
+			} else {
+				inLine[b]   = d & 0x0003f;
+				inLine[b+1] = (d & 0x00fc0) >> 6;
+				inLine[b+2] = d >> 12;
+			}
+		}
+		document->subPage(0)->setPacket(readPacketNumber, readDesignationCode, QByteArray((const char *)&inLine[2], 40));
+	}
+
+	if (!firstPacket0Found)
+		qDebug("No X/0 found");
+	else if (!pageBodyPacketsFound)
+		qDebug("X/0 found, but no page body packets were found");
+}
+
 // Used by saveTTI and HashString
 int controlBitsToPS(PageBase *subPage)
 {
@@ -182,7 +382,7 @@ void saveTTI(QSaveFile &file, const TeletextDocument &document)
 
 	auto write7bitPacket=[&](int packetNumber)
 	{
-		if (document.subPage(p)->packetNeeded(packetNumber)) {
+		if (document.subPage(p)->packetExists(packetNumber)) {
 			QByteArray outLine = document.subPage(p)->packet(packetNumber);
 
 			outStream << QString("OL,%1,").arg(packetNumber);
@@ -193,13 +393,17 @@ void saveTTI(QSaveFile &file, const TeletextDocument &document)
 					outLine.insert(c, 0x1b);
 					c++;
 				}
+#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
 			outStream << outLine << Qt::endl;
+#else
+			outStream << outLine << endl;
+#endif
 		}
 	};
 
 	auto writeHammingPacket=[&](int packetNumber, int designationCode=0)
 	{
-		if (document.subPage(p)->packetNeeded(packetNumber, designationCode)) {
+		if (document.subPage(p)->packetExists(packetNumber, designationCode)) {
 			QByteArray outLine = document.subPage(p)->packet(packetNumber, designationCode);
 
 			outStream << QString("OL,%1,").arg(packetNumber);
@@ -207,14 +411,22 @@ void saveTTI(QSaveFile &file, const TeletextDocument &document)
 			outLine[0] = designationCode | 0x40;
 			for (int c=1; c<outLine.size(); c++)
 				outLine[c] = outLine.at(c) | 0x40;
+#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
 			outStream << outLine << Qt::endl;
+#else
+			outStream << outLine << endl;
+#endif
 		}
 	};
 
 	outStream.setCodec("ISO-8859-1");
 
 	if (!document.description().isEmpty())
+#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
 		outStream << "DE," << document.description() << Qt::endl;
+#else
+		outStream << "DE," << document.description() << endl;
+#endif
 
 	// TODO DS and SP commands
 
@@ -224,23 +436,50 @@ void saveTTI(QSaveFile &file, const TeletextDocument &document)
 
 	for (p=0; p<document.numberOfSubPages(); p++) {
 
-		outStream << QString("PN,%1%2").arg(document.pageNumber(), 3, 16, QChar('0')).arg(subPageNumber & 0xff, 2, 16, QChar('0')) << Qt::endl;
+		// Page number
+		outStream << QString("PN,%1%2").arg(document.pageNumber(), 3, 16, QChar('0')).arg(subPageNumber & 0xff, 2, 10, QChar('0'));
+#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
+			outStream << Qt::endl;
+#else
+			outStream << endl;
+#endif
+
+		// Subpage
 		// Magazine Organisation Table and Magazine Inventory Page don't have subpages
-		if (document.pageFunction() != TeletextDocument::PFMOT && document.pageFunction() != TeletextDocument::PFMIP)
-			outStream << QString("SC,%1").arg(subPageNumber, 4, 16, QChar('0')) << Qt::endl;
+		if (document.pageFunction() != TeletextDocument::PFMOT && document.pageFunction() != TeletextDocument::PFMIP) {
+			outStream << QString("SC,%1").arg(subPageNumber, 4, 10, QChar('0'));
+#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
+			outStream << Qt::endl;
+#else
+			outStream << endl;
+#endif
+		}
 
-		outStream << QString("PS,%1").arg(0x8000 | controlBitsToPS(document.subPage(p)), 4, 16, QChar('0')) << Qt::endl;
+		// Status bits
+		outStream << QString("PS,%1").arg(0x8000 | controlBitsToPS(document.subPage(p)), 4, 16, QChar('0'));
+#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
+		outStream << Qt::endl;
+#else
+		outStream << endl;
+#endif
 
+		// Cycle time
 		if (document.pageFunction() == TeletextDocument::PFLevelOnePage)
 			// Assume that only Level One Pages have configurable cycle times
-			outStream << QString("CT,%1,%2").arg(document.subPage(p)->cycleValue()).arg(document.subPage(p)->cycleType()==LevelOnePage::CTcycles ? 'C' : 'T') << Qt::endl;
+			outStream << QString("CT,%1,%2").arg(document.subPage(p)->cycleValue()).arg(document.subPage(p)->cycleType()==LevelOnePage::CTcycles ? 'C' : 'T');
 		else
 			// X/28/0 specifies page function and coding but the PF command
 			// should make it obvious to a human that this isn't a Level One Page
-			outStream << QString("PF,%1,%2").arg(document.pageFunction()).arg(document.packetCoding()) << Qt::endl;
+			outStream << QString("PF,%1,%2").arg(document.pageFunction()).arg(document.packetCoding());
+#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
+		outStream << Qt::endl;
+#else
+		outStream << endl;
+#endif
 
+		// FastText links
 		bool writeFLCommand = false;
-		if (document.pageFunction() == TeletextDocument::PFLevelOnePage && document.subPage(p)->packetNeeded(27,0)) {
+		if (document.pageFunction() == TeletextDocument::PFLevelOnePage && document.subPage(p)->packetExists(27,0)) {
 			// Subpage has FastText links - if any link to a specific subpage, we need to write X/27/0 as raw
 			// otherwise we write the links as a human-readable FL command later on
 			writeFLCommand = true;
@@ -252,7 +491,7 @@ void saveTTI(QSaveFile &file, const TeletextDocument &document)
 				}*/
 		}
 
-		// X27 then X28 always come first
+		// X/27 then X/28 always come first
 		for (int i=(writeFLCommand ? 1 : 0); i<16; i++)
 			writeHammingPacket(27, i);
 		for (int i=0; i<16; i++)
@@ -285,16 +524,204 @@ void saveTTI(QSaveFile &file, const TeletextDocument &document)
 				if (i<5)
 					outStream << ',';
 			}
+#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
 			outStream << Qt::endl;
+#else
+			outStream << endl;
+#endif
 		}
 
 		subPageNumber++;
 	}
 }
 
+void exportM29File(QSaveFile &file, const TeletextDocument &document)
+{
+	const PageBase &subPage = *document.currentSubPage();
+	QTextStream outStream(&file);
+
+	auto writeM29Packet=[&](int designationCode)
+	{
+		if (subPage.packetExists(28, designationCode)) {
+			QByteArray outLine = subPage.packet(28, designationCode);
+
+			outStream << QString("OL,29,");
+			// TTI stores raw values with bit 6 set, doesn't do Hamming encoding
+			outLine[0] = designationCode | 0x40;
+			for (int c=1; c<outLine.size(); c++)
+				outLine[c] = outLine.at(c) | 0x40;
+#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
+			outStream << outLine << Qt::endl;
+#else
+			outStream << outLine << endl;
+#endif
+		}
+	};
+
+	outStream.setCodec("ISO-8859-1");
+
+	if (!document.description().isEmpty())
+#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
+	outStream << "DE," << document.description() << Qt::endl;
+#else
+	outStream << "DE," << document.description() << endl;
+#endif
+
+	// Force page number to xFF
+	outStream << QString("PN,%1ff00").arg(document.pageNumber() >> 8, 1, 16);
+#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
+	outStream << Qt::endl;
+#else
+	outStream << endl;
+#endif
+
+	outStream << "PS,8000";
+#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
+	outStream << Qt::endl;
+#else
+	outStream << endl;
+#endif
+
+	writeM29Packet(0);
+	writeM29Packet(1);
+	writeM29Packet(4);
+}
+
+void exportT42File(QSaveFile &file, const TeletextDocument &document)
+{
+	const PageBase &subPage = *document.currentSubPage();
+
+	QDataStream outStream(&file);
+	// Displayable row header we export as spaces, hence the (odd parity valid) 0x20 init value
+	QByteArray outLine(42, 0x20);
+	int magazineNumber = (document.pageNumber() & 0xf00) >> 8;
+
+	auto write7bitPacket=[&](int packetNumber)
+	{
+		if (subPage.packetExists(packetNumber)) {
+			outLine[0] = hamming_8_4_encode[magazineNumber | ((packetNumber & 0x01) << 3)];
+			outLine[1] = hamming_8_4_encode[packetNumber >> 1];
+			outLine.replace(2, 40, subPage.packet(packetNumber));
+
+			// Odd parity encoding
+			for (int c=0; c<outLine.size(); c++) {
+				char p = outLine.at(c);
+
+				// Recursively divide integer into two equal halves and take their XOR until only 1 bit is left
+				p ^= p >> 4;
+				p ^= p >> 2;
+				p ^= p >> 1;
+				// If last bit left is 0 then it started with an even number of bits, so do the odd parity
+				if (!(p & 1))
+					outLine[c] = outLine.at(c) | 0x80;
+			}
+			outStream.writeRawData(outLine.constData(), 42);
+		}
+	};
+
+	auto writeHamming8_4Packet=[&](int packetNumber, int designationCode=0)
+	{
+		if (subPage.packetExists(packetNumber, designationCode)) {
+			outLine[0] = hamming_8_4_encode[magazineNumber | ((packetNumber & 0x01) << 3)];
+			outLine[1] = hamming_8_4_encode[packetNumber >> 1];
+			outLine.replace(2, 40, subPage.packet(packetNumber, designationCode));
+			outLine[2] = hamming_8_4_encode[designationCode];
+
+			for (int c=3; c<outLine.size(); c++)
+				outLine[c] = hamming_8_4_encode[(int)outLine.at(c)];
+
+			outStream.writeRawData(outLine.constData(), 42);
+		}
+	};
+
+	auto writeHamming24_18Packet=[&](int packetNumber, int designationCode=0)
+	{
+		if (subPage.packetExists(packetNumber, designationCode)) {
+			outLine[0] = hamming_8_4_encode[magazineNumber | ((packetNumber & 0x01) << 3)];
+			outLine[1] = hamming_8_4_encode[packetNumber >> 1];
+			outLine.replace(2, 40, subPage.packet(packetNumber, designationCode));
+			outLine[2] = hamming_8_4_encode[designationCode];
+
+			for (int c=3; c<outLine.size(); c+=3) {
+				unsigned int D5_D11;
+				unsigned int D12_D18;
+				unsigned int P5, P6;
+				unsigned int Byte_0;
+
+				const unsigned int toEncode = outLine[c] | (outLine[c+1] << 6) | (outLine[c+2] << 12);
+
+				Byte_0 = (hamming_24_18_forward[0][(toEncode >> 0) & 0xff] ^ hamming_24_18_forward[1][(toEncode >> 8) & 0xff] ^ hamming_24_18_forward_2[(toEncode >> 16) & 0x03]);
+				outLine[c] = Byte_0;
+
+				D5_D11 = (toEncode >> 4) & 0x7f;
+				D12_D18 = (toEncode >> 11) & 0x7f;
+
+				P5 = 0x80 & ~(hamming_24_18_parities[0][D12_D18] << 2);
+				outLine[c+1] = D5_D11 | P5;
+
+				P6 = 0x80 & ((hamming_24_18_parities[0][Byte_0] ^ hamming_24_18_parities[0][D5_D11]) << 2);
+				outLine[c+2] = D12_D18 | P6;
+			}
+
+			outStream.writeRawData(outLine.constData(), 42);
+		}
+	};
+
+
+	if (magazineNumber == 8)
+		magazineNumber = 0;
+
+	// Write X/0 separately as it features both Hamming 8/4 and 7-bit odd parity within
+	outLine[0] = magazineNumber & 0x07;
+	outLine[1] = 0; // Packet number 0
+	outLine[2] = document.pageNumber() & 0x00f;
+	outLine[3] = (document.pageNumber() & 0x0f0) >> 4;
+	outLine[4] = 0; // Subcode S1 - always export as 0
+	outLine[5] = subPage.controlBit(PageBase::C4ErasePage) << 3;
+	outLine[6] = 0; // Subcode S3 - always export as 0
+	outLine[7] = (subPage.controlBit(PageBase::C5Newsflash) << 2) | (subPage.controlBit(PageBase::C6Subtitle) << 3);
+	outLine[8] = subPage.controlBit(PageBase::C7SuppressHeader) | (subPage.controlBit(PageBase::C8Update) << 1) | (subPage.controlBit(PageBase::C9InterruptedSequence) << 2) | (subPage.controlBit(PageBase::C10InhibitDisplay) << 3);
+	outLine[9] = subPage.controlBit(PageBase::C11SerialMagazine) | (subPage.controlBit(PageBase::C14NOS) << 1) | (subPage.controlBit(PageBase::C13NOS) << 2) | (subPage.controlBit(PageBase::C12NOS) << 3);
+
+	for (int i=0; i<10; i++)
+		outLine[i] = hamming_8_4_encode[(int)outLine.at(i)];
+
+	// If we allow text in the row header, we'd odd-parity encode it here
+
+	outStream.writeRawData(outLine.constData(), 42);
+
+	// After X/0, X/27 then X/28 always come next
+	for (int i=0; i<4; i++)
+		writeHamming8_4Packet(27, i);
+	for (int i=4; i<16; i++)
+		writeHamming24_18Packet(27, i);
+	for (int i=0; i<16; i++)
+		writeHamming24_18Packet(28, i);
+
+	if (document.packetCoding() == TeletextDocument::Coding7bit) {
+		// For 7 bit coding i.e. Level One Pages, X/26 are written before X/1 to X/25
+		for (int i=0; i<16; i++)
+			writeHamming24_18Packet(26, i);
+		for (int i=1; i<=24; i++)
+			write7bitPacket(i);
+	} else {
+		// For others (especially (G)POP pages) X/1 to X/25 are written before X/26
+		if (document.packetCoding() == TeletextDocument::Coding18bit)
+			for (int i=1; i<=25; i++)
+				writeHamming24_18Packet(i);
+		else if (document.packetCoding() == TeletextDocument::Coding4bit)
+			for (int i=1; i<=25; i++)
+				writeHamming8_4Packet(i);
+		else
+			qDebug("Exported broken file as page coding is not supported");
+		for (int i=0; i<16; i++)
+			writeHamming24_18Packet(26, i);
+	}
+}
+
 QByteArray rowPacketAlways(PageBase *subPage, int packetNumber)
 {
-	if (subPage->packetNeeded(packetNumber))
+	if (subPage->packetExists(packetNumber))
 		return subPage->packet(packetNumber);
 	else
 		return QByteArray(40, ' ');
@@ -345,7 +772,7 @@ QString exportHashStringPackets(LevelOnePage *subPage)
 	const char base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
 	QString result;
 
-	if (subPage->packetNeeded(28,0) || subPage->packetNeeded(28,4)) {
+	if (subPage->packetExists(28,0) || subPage->packetExists(28,4)) {
 		// X/28/0 and X/28/4 are duplicates apart from the CLUT definitions
 		// Assemble the duplicate beginning and ending of both packets
 		QString x28StringBegin, x28StringEnd;
@@ -356,9 +783,9 @@ QString exportHashStringPackets(LevelOnePage *subPage)
 
 		x28StringEnd = QString("%1%2%3%4").arg(subPage->defaultScreenColour(), 2, 16, QChar('0')).arg(subPage->defaultRowColour(), 2, 16, QChar('0')).arg(subPage->blackBackgroundSubst(), 1, 10).arg(subPage->colourTableRemap(), 1, 10);
 
-		if (subPage->packetNeeded(28,0))
+		if (subPage->packetExists(28,0))
 			result.append(":X280=" + x28StringBegin + colourToHexString(2) + colourToHexString(3) + x28StringEnd);
-		if (subPage->packetNeeded(28,4))
+		if (subPage->packetExists(28,4))
 			result.append(":X284=" + x28StringBegin + colourToHexString(0) + colourToHexString(1) + x28StringEnd);
 	}
 

loadsave.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -30,11 +30,14 @@
 #include "levelonepage.h"
 #include "pagebase.h"
 
-void loadTTI(QFile *inFile, TeletextDocument *document);
+void loadTTI(QFile *, TeletextDocument *);
+void importT42(QFile *, TeletextDocument *);
 
 int controlBitsToPS(PageBase *);
 
 void saveTTI(QSaveFile &, const TeletextDocument &);
+void exportT42File(QSaveFile &, const TeletextDocument &);
+void exportM29File(QSaveFile &, const TeletextDocument &);
 
 QByteArray rowPacketAlways(PageBase *, int);
 

main.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -30,7 +30,7 @@ int main(int argc, char *argv[])
 	QApplication::setApplicationDisplayName(QApplication::applicationName());
 	QApplication::setOrganizationName("gkmac.co.uk");
 	QApplication::setOrganizationDomain("gkmac.co.uk");
-	QApplication::setApplicationVersion("0.1-alpha");
+	QApplication::setApplicationVersion("0.5.3-alpha");
 	QCommandLineParser parser;
 	parser.setApplicationDescription(QApplication::applicationName());
 	parser.addHelpOption();

mainwidget.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -17,13 +17,18 @@
  * along with QTeletextMaker.  If not, see <https://www.gnu.org/licenses/>.
  */
 
+#include <QApplication>
 #include <QBitmap>
+#include <QClipboard>
 #include <QFrame>
 #include <QGraphicsItem>
+#include <QGraphicsItemGroup>
 #include <QGraphicsProxyWidget>
 #include <QGraphicsScene>
+#include <QGraphicsSceneEvent>
 #include <QKeyEvent>
 #include <QMenu>
+#include <QMimeData>
 #include <QPainter>
 #include <QPair>
 #include <QUndoCommand>
@@ -50,7 +55,6 @@ TeletextWidget::TeletextWidget(QFrame *parent) : QFrame(parent)
 	m_pageRender.setTeletextPage(m_levelOnePage);
 	m_insertMode = false;
 	m_selectionInProgress = false;
-	m_grid = false;
 	setFocusPolicy(Qt::StrongFocus);
 	m_flashTiming = m_flashPhase = 0;
 	connect(&m_pageRender, &TeletextPageRender::flashChanged, this, &TeletextWidget::updateFlashTimer);
@@ -58,7 +62,6 @@ TeletextWidget::TeletextWidget(QFrame *parent) : QFrame(parent)
 	connect(m_teletextDocument, &TeletextDocument::subPageSelected, this, &TeletextWidget::subPageSelected);
 	connect(m_teletextDocument, &TeletextDocument::contentsChange, this, &TeletextWidget::refreshRow);
 	connect(m_teletextDocument, &TeletextDocument::refreshNeeded, this, &TeletextWidget::refreshPage);
-	connect(m_teletextDocument, &TeletextDocument::selectionMoved, this, QOverload<>::of(&TeletextWidget::update));
 }
 
 TeletextWidget::~TeletextWidget()
@@ -109,13 +112,6 @@ void TeletextWidget::paintEvent(QPaintEvent *event)
 		widgetPainter.drawPixmap(0, 0, *m_pageRender.pagePixmap(m_flashPhase), 864-m_pageRender.leftSidePanelColumns()*12, 0, m_pageRender.leftSidePanelColumns()*12, 250);
 	if (m_pageRender.rightSidePanelColumns())
 		widgetPainter.drawPixmap(480+m_pageRender.leftSidePanelColumns()*12, 0, *m_pageRender.pagePixmap(m_flashPhase), 480, 0, m_pageRender.rightSidePanelColumns()*12, 250);
-	if (this->hasFocus())
-		widgetPainter.fillRect((m_teletextDocument->cursorColumn()+m_pageRender.leftSidePanelColumns())*12, m_teletextDocument->cursorRow()*10, 12, 10, QColor(128, 128, 128, 192));
-	if (m_teletextDocument->selectionActive()) {
-		widgetPainter.setPen(QPen(QColor(192, 192, 192, 224), 1, Qt::DashLine));
-		widgetPainter.setBrush(QBrush(QColor(255, 255, 255, 64)));
-		widgetPainter.drawRect((m_teletextDocument->selectionLeftColumn()+m_pageRender.leftSidePanelColumns())*12, m_teletextDocument->selectionTopRow()*10, m_teletextDocument->selectionWidth()*12-1, m_teletextDocument->selectionHeight()*10-1);
-	}
 }
 
 void TeletextWidget::updateFlashTimer(int newFlashTimer)
@@ -144,6 +140,16 @@ void TeletextWidget::timerEvent(QTimerEvent *event)
 		QWidget::timerEvent(event);
 }
 
+void TeletextWidget::pauseFlash(bool pauseNow)
+{
+	if (pauseNow && m_flashTiming != 0) {
+		m_flashTimer.stop();
+		m_flashPhase = 0;
+		update();
+	} else if (m_flashTiming != 0)
+		m_flashTimer.start((m_flashTiming == 1) ? 500 : 167, this);
+}
+
 void TeletextWidget::setInsertMode(bool insertMode)
 {
 	m_insertMode = insertMode;
@@ -161,14 +167,6 @@ void TeletextWidget::toggleMix(bool mixOn)
 	update();
 }
 
-void TeletextWidget::toggleGrid(bool gridOn)
-{
-	m_grid = gridOn;
-	m_pageRender.setGrid(gridOn);
-	m_pageRender.renderPage();
-	update();
-}
-
 void TeletextWidget::setControlBit(int bitNumber, bool active)
 {
 	m_levelOnePage->setControlBit(bitNumber, active);
@@ -354,32 +352,27 @@ void TeletextWidget::keyPressEvent(QKeyEvent *event)
 			break;
 
 		case Qt::Key_Up:
-			m_teletextDocument->cursorUp();
-			update();
+			m_teletextDocument->cursorUp(event->modifiers() & Qt::ShiftModifier);
 			break;
 		case Qt::Key_Down:
-			m_teletextDocument->cursorDown();
-			update();
+			m_teletextDocument->cursorDown(event->modifiers() & Qt::ShiftModifier);
 			break;
 		case Qt::Key_Left:
-			m_teletextDocument->cursorLeft();
-			update();
+			m_teletextDocument->cursorLeft(event->modifiers() & Qt::ShiftModifier);
 			break;
 		case Qt::Key_Right:
-			m_teletextDocument->cursorRight();
-			update();
+			m_teletextDocument->cursorRight(event->modifiers() & Qt::ShiftModifier);
 			break;
 		case Qt::Key_Return:
 		case Qt::Key_Enter:
 			m_teletextDocument->cursorDown();
-			// fall through
-		case Qt::Key_Home:
 			m_teletextDocument->moveCursor(m_teletextDocument->cursorRow(), 0);
-			update();
+			break;
+		case Qt::Key_Home:
+			m_teletextDocument->moveCursor(m_teletextDocument->cursorRow(), 0, event->modifiers() & Qt::ShiftModifier);
 			break;
 		case Qt::Key_End:
-			m_teletextDocument->moveCursor(m_teletextDocument->cursorRow(), 39);
-			update();
+			m_teletextDocument->moveCursor(m_teletextDocument->cursorRow(), 39, event->modifiers() & Qt::ShiftModifier);
 			break;
 
 		case Qt::Key_PageUp:
@@ -405,8 +398,62 @@ void TeletextWidget::setCharacter(unsigned char newCharacter)
 
 void TeletextWidget::toggleCharacterBit(unsigned char bitToToggle)
 {
-	QUndoCommand *toggleMosaicBitCommand = new ToggleMosaicBitCommand(m_teletextDocument, bitToToggle);
-	m_teletextDocument->undoStack()->push(toggleMosaicBitCommand);
+	m_teletextDocument->undoStack()->push(new ToggleMosaicBitCommand(m_teletextDocument, bitToToggle));
+}
+
+void TeletextWidget::selectionToClipboard()
+{
+	QByteArray nativeData;
+	QString plainTextData;
+	QClipboard *clipboard = QApplication::clipboard();
+
+	nativeData.resize(2 + m_teletextDocument->selectionWidth() * m_teletextDocument->selectionHeight());
+	nativeData[0] = m_teletextDocument->selectionHeight();
+	nativeData[1] = m_teletextDocument->selectionWidth();
+
+	plainTextData.reserve((m_teletextDocument->selectionWidth()+1) * m_teletextDocument->selectionHeight() - 1);
+
+	int i=2;
+
+	for (int r=m_teletextDocument->selectionTopRow(); r<=m_teletextDocument->selectionBottomRow(); r++) {
+		for (int c=m_teletextDocument->selectionLeftColumn(); c<=m_teletextDocument->selectionRightColumn(); c++) {
+			nativeData[i++] = m_teletextDocument->currentSubPage()->character(r, c);
+
+			if (m_teletextDocument->currentSubPage()->character(r, c) >= 0x20)
+				plainTextData.append(keymapping[m_pageRender.level1CharSet(r, c)].key(m_teletextDocument->currentSubPage()->character(r, c), m_teletextDocument->currentSubPage()->character(r, c)));
+			else
+				plainTextData.append(' ');
+		}
+
+		plainTextData.append('\n');
+	}
+
+	QMimeData *mimeData = new QMimeData();
+	mimeData->setData("application/x-teletext", nativeData);
+	mimeData->setText(plainTextData);
+	clipboard->setMimeData(mimeData);
+}
+
+void TeletextWidget::cut()
+{
+	if (!m_teletextDocument->selectionActive())
+		return;
+
+	selectionToClipboard();
+	m_teletextDocument->undoStack()->push(new CutCommand(m_teletextDocument));
+}
+
+void TeletextWidget::copy()
+{
+	if (!m_teletextDocument->selectionActive())
+		return;
+
+	selectionToClipboard();
+}
+
+void TeletextWidget::paste()
+{
+	m_teletextDocument->undoStack()->push(new PasteCommand(m_teletextDocument, m_pageRender.level1CharSet(m_teletextDocument->cursorRow(), m_teletextDocument->cursorColumn())));
 }
 
 QPair<int, int> TeletextWidget::mouseToRowAndColumn(const QPoint &mousePosition)
@@ -438,25 +485,12 @@ void TeletextWidget::mouseMoveEvent(QMouseEvent *event)
 {
 	if (event->buttons() & Qt::LeftButton) {
 		QPair<int, int> position = mouseToRowAndColumn(event->pos());
-		if (m_selectionInProgress || position.first != m_teletextDocument->cursorRow() || position.second != m_teletextDocument->cursorColumn()) {
-			int topRow, bottomRow, leftColumn, rightColumn;
-
-			m_selectionInProgress = true;
-			if (m_teletextDocument->cursorRow() < position.first) {
-				topRow = m_teletextDocument->cursorRow();
-				bottomRow = position.first;
-			} else {
-				topRow = position.first;
-				bottomRow = m_teletextDocument->cursorRow();
+		if (position.first != m_teletextDocument->cursorRow() || position.second != m_teletextDocument->cursorColumn()) {
+			if (!m_selectionInProgress) {
+				m_selectionInProgress = true;
+				m_teletextDocument->setSelectionCorner(m_teletextDocument->cursorRow(), m_teletextDocument->cursorColumn());
 			}
-			if (m_teletextDocument->cursorColumn() < position.second) {
-				leftColumn = m_teletextDocument->cursorColumn();
-				rightColumn = position.second;
-			} else {
-				leftColumn = position.second;
-				rightColumn = m_teletextDocument->cursorColumn();
-			}
-			m_teletextDocument->setSelection(topRow, leftColumn, bottomRow, rightColumn);
+			m_teletextDocument->moveCursor(position.first, position.second, true);
 		}
 	}
 }
@@ -480,7 +514,12 @@ void TeletextWidget::focusOutEvent(QFocusEvent *event)
 
 LevelOneScene::LevelOneScene(QWidget *levelOneWidget, QObject *parent) : QGraphicsScene(parent)
 {
+	m_grid = false;
+
+	// These dimensions are scratch, setBorderDimensions will get called straight away to adjust them
 	setSceneRect(0, 0, 600, 288);
+
+	// Full screen colours
 	m_fullScreenTopRectItem = new QGraphicsRectItem(0, 0, 600, 19);
 	m_fullScreenTopRectItem->setPen(Qt::NoPen);
 	m_fullScreenTopRectItem->setBrush(QBrush(QColor(0, 0, 0)));
@@ -490,6 +529,7 @@ LevelOneScene::LevelOneScene(QWidget *levelOneWidget, QObject *parent) : QGraphi
 	m_fullScreenBottomRectItem->setBrush(QBrush(QColor(0, 0, 0)));
 	addItem(m_fullScreenBottomRectItem);
 
+	// Full row colours
 	for (int r=0; r<25; r++) {
 		m_fullRowLeftRectItem[r] = new QGraphicsRectItem(0, 19+r*10, 60, 10);
 		m_fullRowLeftRectItem[r]->setPen(Qt::NoPen);
@@ -501,16 +541,59 @@ LevelOneScene::LevelOneScene(QWidget *levelOneWidget, QObject *parent) : QGraphi
 		addItem(m_fullRowRightRectItem[r]);
 	}
 
+	// Main text widget
 	m_levelOneProxyWidget = addWidget(levelOneWidget);
 	m_levelOneProxyWidget->setPos(60, 19);
 	m_levelOneProxyWidget->setAutoFillBackground(false);
+	m_levelOneProxyWidget->setFocus();
+
+	// Selection
+	m_selectionRectItem = new QGraphicsRectItem(0, 0, 12, 10);
+	m_selectionRectItem->setVisible(false);
+	m_selectionRectItem->setPen(QPen(QColor(192, 192, 192), 1, Qt::DashLine));
+	m_selectionRectItem->setBrush(QBrush(QColor(255, 255, 255, 64)));
+	addItem(m_selectionRectItem);
+
+	// Cursor
+	m_cursorRectItem = new QGraphicsRectItem(0, 0, 12, 10);
+	m_cursorRectItem->setPen(Qt::NoPen);
+	m_cursorRectItem->setBrush(QBrush(QColor(128, 128, 128, 192)));
+	addItem(m_cursorRectItem);
+
+	// Optional grid overlay for text widget
+	m_mainGridItemGroup = new QGraphicsItemGroup;
+	m_mainGridItemGroup->setVisible(false);
+	addItem(m_mainGridItemGroup);
+	// Additional vertical pieces of grid for side panels
+	for (int i=0; i<32; i++) {
+		m_sidePanelGridNeeded[i] = false;
+		m_sidePanelGridItemGroup[i] = new QGraphicsItemGroup;
+		m_sidePanelGridItemGroup[i]->setVisible(false);
+		addItem(m_sidePanelGridItemGroup[i]);
+	}
+	for (int r=1; r<25; r++) {
+		for (int c=0; c<40; c++) {
+			QGraphicsRectItem *gridPiece = new QGraphicsRectItem(c*12, r*10, 12, 10);
+			gridPiece->setPen(QPen(QBrush(QColor(128, 128, 128, r<24 ? 192 : 128)), 0));
+			m_mainGridItemGroup->addToGroup(gridPiece);
+		}
+
+		if (r < 24)
+			for (int c=0; c<32; c++) {
+				QGraphicsRectItem *gridPiece = new QGraphicsRectItem(0, r*10, 12, 10);
+				gridPiece->setPen(QPen(QBrush(QColor(128, 128, 128, 64)), 0));
+				m_sidePanelGridItemGroup[c]->addToGroup(gridPiece);
+			}
+	}
+
+	installEventFilter(this);
 }
 
-void LevelOneScene::setDimensions(int sceneWidth, int sceneHeight, int widgetWidth)
+void LevelOneScene::setBorderDimensions(int sceneWidth, int sceneHeight, int widgetWidth, int leftSidePanelColumns, int rightSidePanelColumns)
 {
 	setSceneRect(0, 0, sceneWidth, sceneHeight);
 
-	// Assume widget height is always 250
+	// Assume text widget height is always 250
 	int topBottomBorders = (sceneHeight-250) / 2;
 	// Ideally we'd use m_levelOneProxyWidget->size() to discover the widget width ourselves
 	// but this causes a stubborn segfault, so we have to receive the widgetWidth as a parameter
@@ -518,15 +601,103 @@ void LevelOneScene::setDimensions(int sceneWidth, int sceneHeight, int widgetWid
 
 	m_levelOneProxyWidget->setPos(leftRightBorders, topBottomBorders);
 
+	// Position grid to cover central 40 columns
+	m_mainGridItemGroup->setPos(leftRightBorders + leftSidePanelColumns*12, topBottomBorders);
+
+	updateCursor();
+	updateSelection();
+
+	// Grid for right side panel
+	for (int c=0; c<16; c++)
+		if (rightSidePanelColumns > c) {
+			m_sidePanelGridItemGroup[c]->setPos(leftRightBorders + leftSidePanelColumns*12 + 480 + c*12, topBottomBorders);
+			m_sidePanelGridItemGroup[c]->setVisible(m_grid);
+			m_sidePanelGridNeeded[c] = true;
+		} else {
+			m_sidePanelGridItemGroup[c]->setVisible(false);
+			m_sidePanelGridNeeded[c] = false;
+		}
+	// Grid for left side panel
+	for (int c=0; c<16; c++)
+		if (c < leftSidePanelColumns) {
+			m_sidePanelGridItemGroup[31-c]->setPos(leftRightBorders + (leftSidePanelColumns-c-1)*12, topBottomBorders);
+			m_sidePanelGridItemGroup[31-c]->setVisible(m_grid);
+			m_sidePanelGridNeeded[31-c] = true;
+		} else {
+			m_sidePanelGridItemGroup[31-c]->setVisible(false);
+			m_sidePanelGridNeeded[31-c] = false;
+		}
+
+	// Full screen colours
 	m_fullScreenTopRectItem->setRect(0, 0, sceneWidth, topBottomBorders);
 	m_fullScreenBottomRectItem->setRect(0, 250+topBottomBorders, sceneWidth, topBottomBorders);
-
+	// Full row colours
 	for (int r=0; r<25; r++) {
 		m_fullRowLeftRectItem[r]->setRect(0, topBottomBorders+r*10, leftRightBorders+1, 10);
 		m_fullRowRightRectItem[r]->setRect(sceneWidth-leftRightBorders-1, topBottomBorders+r*10, leftRightBorders+1, 10);
 	}
 }
 
+void LevelOneScene::updateCursor()
+{
+	m_cursorRectItem->setPos(m_mainGridItemGroup->pos().x() + static_cast<TeletextWidget *>(m_levelOneProxyWidget->widget())->document()->cursorColumn()*12, m_mainGridItemGroup->pos().y() + static_cast<TeletextWidget *>(m_levelOneProxyWidget->widget())->document()->cursorRow()*10);
+}
+
+void LevelOneScene::updateSelection()
+{
+	if (!static_cast<TeletextWidget *>(m_levelOneProxyWidget->widget())->document()->selectionActive()) {
+		m_selectionRectItem->setVisible(false);
+		return;
+	}
+
+	m_selectionRectItem->setRect(m_mainGridItemGroup->pos().x() + static_cast<TeletextWidget *>(m_levelOneProxyWidget->widget())->document()->selectionLeftColumn()*12, m_mainGridItemGroup->pos().y() + static_cast<TeletextWidget *>(m_levelOneProxyWidget->widget())->document()->selectionTopRow()*10, static_cast<TeletextWidget *>(m_levelOneProxyWidget->widget())->document()->selectionWidth()*12-1, static_cast<TeletextWidget *>(m_levelOneProxyWidget->widget())->document()->selectionHeight()*10-1);
+
+	m_selectionRectItem->setVisible(true);
+}
+
+void LevelOneScene::toggleGrid(bool gridOn)
+{
+	m_grid = gridOn;
+	m_mainGridItemGroup->setVisible(gridOn);
+	for (int i=0; i<32; i++)
+		if (m_sidePanelGridNeeded[i])
+			m_sidePanelGridItemGroup[i]->setVisible(gridOn);
+}
+
+void LevelOneScene::hideGUIElements(bool hidden)
+{
+	if (hidden) {
+		m_mainGridItemGroup->setVisible(false);
+		m_cursorRectItem->setVisible(false);
+		m_selectionRectItem->setVisible(false);
+		for (int i=0; i<32; i++)
+			if (m_sidePanelGridNeeded[i])
+				m_sidePanelGridItemGroup[i]->setVisible(false);
+	} else {
+		if (static_cast<TeletextWidget *>(m_levelOneProxyWidget->widget())->document()->selectionActive())
+			m_selectionRectItem->setVisible(true);
+
+		m_cursorRectItem->setVisible(true);
+		toggleGrid(m_grid);
+	}
+}
+
+bool LevelOneScene::eventFilter(QObject *object, QEvent *event)
+{
+	Q_UNUSED(object);
+
+	if (event->type() == QEvent::GraphicsSceneWheel && static_cast<QGraphicsSceneWheelEvent *>(event)->modifiers() == Qt::ControlModifier) {
+		if (static_cast<QGraphicsSceneWheelEvent *>(event)->delta() > 0)
+			emit mouseZoomIn();
+		else if (static_cast<QGraphicsSceneWheelEvent *>(event)->delta() < 0)
+			emit mouseZoomOut();
+
+		event->accept();
+		return true;
+	}
+	return false;
+}
+
 void LevelOneScene::setFullScreenColour(const QColor &newColor)
 {
 	m_fullScreenTopRectItem->setBrush(QBrush(newColor));

mainwidget.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -22,6 +22,7 @@
 
 #include <QBasicTimer>
 #include <QFrame>
+#include <QGraphicsItemGroup>
 #include <QGraphicsProxyWidget>
 #include <QGraphicsScene>
 #include <QPair>
@@ -62,8 +63,8 @@ public slots:
 	void refreshPage();
 	void toggleReveal(bool);
 	void toggleMix(bool);
-	void toggleGrid(bool);
 	void updateFlashTimer(int);
+	void pauseFlash(bool);
 	void refreshRow(int);
 
 	void setControlBit(int, bool);
@@ -75,6 +76,11 @@ public slots:
 	void setBlackBackgroundSubst(bool);
 	void setSidePanelWidths(int, int);
 	void setSidePanelAtL35Only(bool);
+
+	void cut();
+	void copy();
+	void paste();
+
 	void changeSize();
 
 protected:
@@ -91,13 +97,12 @@ protected:
 private:
 	TeletextDocument* m_teletextDocument;
 	LevelOnePage* m_levelOnePage;
-	bool m_insertMode, m_grid, m_selectionInProgress;
+	bool m_insertMode, m_selectionInProgress;
 	QBasicTimer m_flashTimer;
 	int m_flashTiming, m_flashPhase;
 
 	void timerEvent(QTimerEvent *event) override;
-
-	void calculateDimensions();
+	void selectionToClipboard();
 
 	QPair<int, int> mouseToRowAndColumn(const QPoint &);
 };
@@ -108,16 +113,30 @@ class LevelOneScene : public QGraphicsScene
 
 public:
 	LevelOneScene(QWidget *, QObject *parent = nullptr);
-	void setDimensions(int, int, int);
+	void setBorderDimensions(int, int, int, int, int);
+	QGraphicsRectItem *cursorRectItem() const { return m_cursorRectItem; }
 
 public slots:
+	void updateCursor();
+	void updateSelection();
+	void toggleGrid(bool);
+	void hideGUIElements(bool);
 	void setFullScreenColour(const QColor &);
 	void setFullRowColour(int, const QColor &);
 
+signals:
+	void mouseZoomIn();
+	void mouseZoomOut();
+
 private:
+	bool eventFilter(QObject *, QEvent *);
+
 	QGraphicsRectItem *m_fullScreenTopRectItem, *m_fullScreenBottomRectItem;
 	QGraphicsRectItem *m_fullRowLeftRectItem[25], *m_fullRowRightRectItem[25];
 	QGraphicsProxyWidget *m_levelOneProxyWidget;
+	QGraphicsRectItem *m_cursorRectItem, *m_selectionRectItem;
+	QGraphicsItemGroup *m_mainGridItemGroup, *m_sidePanelGridItemGroup[32];
+	bool m_grid, m_sidePanelGridNeeded[32];
 };
 
 #endif

mainwindow.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -20,11 +20,14 @@
 #include <QApplication>
 #include <QDesktopServices>
 #include <QFileDialog>
+#include <QImage>
 #include <QList>
 #include <QMenuBar>
 #include <QMessageBox>
+#include <QPainter>
 #include <QPushButton>
 #include <QRadioButton>
+#include <QRegExp>
 #include <QSaveFile>
 #include <QScreen>
 #include <QSettings>
@@ -106,20 +109,95 @@ void MainWindow::openFile(const QString &fileName)
 	other->show();
 }
 
+static inline bool hasTTISuffix(const QString &filename)
+{
+	return filename.endsWith(".tti", Qt::CaseInsensitive) || filename.endsWith(".ttix", Qt::CaseInsensitive);
+}
+
+static inline void changeSuffixFromTTI(QString &filename, const QString &newSuffix)
+{
+	if (filename.endsWith(".tti", Qt::CaseInsensitive)) {
+		filename.chop(4);
+		filename.append("." + newSuffix);
+	} else if (filename.endsWith(".ttix", Qt::CaseInsensitive)) {
+		filename.chop(5);
+		filename.append("." + newSuffix);
+	}
+}
+
 bool MainWindow::save()
 {
-	return m_isUntitled ? saveAs() : saveFile(m_curFile);
+	// If imported from non-.tti, force "Save As" so we don't clobber the original imported file
+	return m_isUntitled || !hasTTISuffix(m_curFile) ? saveAs() : saveFile(m_curFile);
 }
 
 bool MainWindow::saveAs()
 {
-	QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"), m_curFile);
+	QString suggestedName = m_curFile;
+
+	// If imported from non-.tti, change extension so we don't clobber the original imported file
+	if (suggestedName.endsWith(".t42", Qt::CaseInsensitive)) {
+		suggestedName.chop(4);
+		suggestedName.append(".tti");
+	}
+
+	QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"), suggestedName, "TTI teletext page (*.tti *.ttix)");
 	if (fileName.isEmpty())
 		return false;
 
 	return saveFile(fileName);
 }
 
+void MainWindow::exportPNG()
+{
+	QString exportFileName = QFileDialog::getSaveFileName(this, tr("Export PNG"), QString(), "PNG image (*.png)");
+	if (exportFileName.isEmpty())
+		return;
+
+	// Prepare widget image for extraction
+	m_textWidget->pauseFlash(true);
+	m_textScene->hideGUIElements(true);
+	bool reshowCodes = m_textWidget->pageRender()->showCodes();
+	if (reshowCodes)
+		m_textWidget->pageRender()->setShowCodes(false);
+	// Disable exporting in Mix mode as it corrupts the background
+	bool reMix = m_textWidget->pageRender()->mix();
+	if (reMix)
+		m_textWidget->pageRender()->setMix(false);
+
+	// Extract the image from the scene
+	QImage interImage = QImage(m_textScene->sceneRect().size().toSize(), QImage::Format_RGB32);
+//	This ought to make the background transparent in Mix mode, but it doesn't
+//	if (m_textWidget->pageRender()->mix())
+//		interImage.fill(QColor(0, 0, 0, 0));
+	QPainter interPainter(&interImage);
+	m_textScene->render(&interPainter);
+
+	// Now we've extracted the image we can put the GUI things back
+	m_textScene->hideGUIElements(false);
+	if (reshowCodes)
+		m_textWidget->pageRender()->setShowCodes(true);
+	if (reMix)
+		m_textWidget->pageRender()->setMix(true);
+	m_textWidget->pauseFlash(false);
+
+	// Now scale the extracted image to the selected aspect ratio
+	// We do this in two steps so that anti-aliasing only occurs on vertical lines
+
+	// Double the vertical height first
+	const QImage doubleHeightImage = interImage.scaled(interImage.width(), interImage.height()*2, Qt::IgnoreAspectRatio, Qt::FastTransformation);
+
+	// If aspect ratio is Pixel 1:2 we're already at the correct scale
+	if (m_viewAspectRatio != 3) {
+		// Scale it horizontally to the selected aspect ratio
+		const QImage scaledImage = doubleHeightImage.scaled((int)((float)doubleHeightImage.width() * aspectRatioHorizontalScaling[m_viewAspectRatio] * 2), doubleHeightImage.height(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
+
+		if (!scaledImage.save(exportFileName, "PNG"))
+			QMessageBox::warning(this, QApplication::applicationDisplayName(), tr("Cannot export file %1.").arg(QDir::toNativeSeparators(exportFileName)));
+	} else if (!doubleHeightImage.save(exportFileName, "PNG"))
+		QMessageBox::warning(this, QApplication::applicationDisplayName(), tr("Cannot export file %1.").arg(QDir::toNativeSeparators(exportFileName)));
+}
+
 void MainWindow::exportZXNet()
 {
 	QDesktopServices::openUrl(QUrl("http://zxnet.co.uk/teletext/editor/" + exportHashStringPage(m_textWidget->document()->currentSubPage()) + exportHashStringPackets(m_textWidget->document()->currentSubPage())));
@@ -132,12 +210,12 @@ void MainWindow::exportEditTF()
 
 void MainWindow::about()
 {
-	QMessageBox::about(this, tr("About QTeletextMaker"), tr("<b>QTeletextMaker</b><br>"
+	QMessageBox::about(this, tr("About"), QString("<b>%1</b><br>"
 	"An open source Level 2.5 teletext page editor.<br>"
-	"<i>Version 0.1-alpha</i><br><br>"
-	"Copyright (C) 2020, 2021 Gavin MacGregor<br><br>"
+	"<i>Version %2</i><br><br>"
+	"Copyright (C) 2020-2022 Gavin MacGregor<br><br>"
 	"Released under the GNU General Public License version 3<br>"
-	"<a href=\"https://github.com/gkthemac/qteletextmaker\">https://github.com/gkthemac/qteletextmaker</a>"));
+	"<a href=\"https://github.com/gkthemac/qteletextmaker\">https://github.com/gkthemac/qteletextmaker</a>").arg(QApplication::applicationDisplayName()).arg(QApplication::applicationVersion()));
 }
 
 void MainWindow::init()
@@ -157,21 +235,23 @@ void MainWindow::init()
 	m_paletteDockWidget = new PaletteDockWidget(m_textWidget);
 	addDockWidget(Qt::RightDockWidgetArea, m_paletteDockWidget);
 
+	m_textScene = new LevelOneScene(m_textWidget, this);
+
 	createActions();
 	createStatusBar();
 
 	readSettings();
 
-	m_textScene = new LevelOneScene(m_textWidget, this);
-
 	m_textView = new QGraphicsView(this);
 	m_textView->setScene(m_textScene);
-	m_textView->setRenderHints(QPainter::SmoothPixmapTransform);
+	if (m_viewSmoothTransform)
+		m_textView->setRenderHints(QPainter::SmoothPixmapTransform);
 	m_textView->setBackgroundBrush(QBrush(QColor(32, 48, 96)));
 	setSceneDimensions();
 	setCentralWidget(m_textView);
 
 	connect(m_textWidget->document(), &TeletextDocument::cursorMoved, this, &MainWindow::updateCursorPosition);
+	connect(m_textWidget->document(), &TeletextDocument::selectionMoved, m_textScene, &LevelOneScene::updateSelection);
 	connect(m_textWidget->document()->undoStack(), &QUndoStack::cleanChanged, this, [=]() { setWindowModified(!m_textWidget->document()->undoStack()->isClean()); } );
 	connect(m_textWidget->document(), &TeletextDocument::aboutToChangeSubPage, m_x26DockWidget, &X26DockWidget::unloadX26List);
 	connect(m_textWidget->document(), &TeletextDocument::subPageSelected, this, &MainWindow::updatePageWidgets);
@@ -180,12 +260,17 @@ void MainWindow::init()
 	connect(m_textWidget->pageRender(), &TeletextPageRender::fullRowColourChanged, m_textScene, &LevelOneScene::setFullRowColour);
 	connect(m_textWidget, &TeletextWidget::insertKeyPressed, this, &MainWindow::toggleInsertMode);
 
+	connect(m_textScene, &LevelOneScene::mouseZoomIn, this, &MainWindow::zoomIn);
+	connect(m_textScene, &LevelOneScene::mouseZoomOut, this, &MainWindow::zoomOut);
+
 	QShortcut *blockShortCut = new QShortcut(QKeySequence(Qt::Key_Escape, Qt::Key_J), m_textView);
 	connect(blockShortCut, &QShortcut::activated, [=]() { m_textWidget->setCharacter(0x7f); });
 
 	setUnifiedTitleAndToolBarOnMac(true);
 
 	updatePageWidgets();
+
+	m_textView->setFocus();
 }
 
 void MainWindow::tile(const QMainWindow *previous)
@@ -251,16 +336,28 @@ void MainWindow::createActions()
 
 	setRecentFilesVisible(MainWindow::hasRecentFiles());
 
-	QMenu *exportHashStringSubMenu = fileMenu->addMenu(tr("Export to online editor"));
+	QAction *exportT42Act = fileMenu->addAction(tr("Export subpage as t42..."));
+	exportT42Act->setStatusTip("Export this subpage as a t42 file");
+	connect(exportT42Act, &QAction::triggered, this, &MainWindow::exportT42);
+
+	QMenu *exportHashStringSubMenu = fileMenu->addMenu(tr("Export subpage to online editor"));
 
 	QAction *exportZXNetAct = exportHashStringSubMenu->addAction(tr("Open in zxnet.co.uk"));
-	exportZXNetAct->setStatusTip("Export and open page in zxnet.co.uk online editor");
+	exportZXNetAct->setStatusTip("Export and open this subpage in the zxnet.co.uk online editor");
 	connect(exportZXNetAct, &QAction::triggered, this, &MainWindow::exportZXNet);
 
 	QAction *exportEditTFAct = exportHashStringSubMenu->addAction(tr("Open in edit.tf"));
-	exportEditTFAct->setStatusTip("Export and open page in edit.tf online editor");
+	exportEditTFAct->setStatusTip("Export and open this subpage in the edit.tf online editor");
 	connect(exportEditTFAct, &QAction::triggered, this, &MainWindow::exportEditTF);
 
+	QAction *exportPNGAct = fileMenu->addAction(tr("Export subpage as PNG..."));
+	exportPNGAct->setStatusTip("Export a PNG image of this subpage");
+	connect(exportPNGAct, &QAction::triggered, this, &MainWindow::exportPNG);
+
+	QAction *exportM29Act = fileMenu->addAction(tr("Export subpage X/28 as M/29..."));
+	exportM29Act->setStatusTip("Export this subpage's X/28 packets as a tti file with M/29 packets");
+	connect(exportM29Act, &QAction::triggered, this, &MainWindow::exportM29);
+
 	fileMenu->addSeparator();
 
 	QAction *closeAct = fileMenu->addAction(tr("&Close"), this, &QWidget::close);
@@ -291,36 +388,33 @@ void MainWindow::createActions()
 	redoAction->setShortcuts(QKeySequence::Redo);
 
 	editMenu->addSeparator();
+
 #ifndef QT_NO_CLIPBOARD
-/*	const QIcon cutIcon = QIcon::fromTheme("edit-cut", QIcon(":/images/cut.png"));
+	const QIcon cutIcon = QIcon::fromTheme("edit-cut", QIcon(":/images/cut.png"));
 	QAction *cutAct = new QAction(cutIcon, tr("Cu&t"), this);
 	cutAct->setShortcuts(QKeySequence::Cut);
-	cutAct->setStatusTip(tr("Cut the current selection's contents to the "
-                            "clipboard"));
-	connect(cutAct, &QAction::triggered, textWidget, &QTextEdit::cut);
+	cutAct->setStatusTip(tr("Cut the current selection's contents to the clipboard"));
+	connect(cutAct, &QAction::triggered, m_textWidget, &TeletextWidget::cut);
 	editMenu->addAction(cutAct);
 	editToolBar->addAction(cutAct);
 
 	const QIcon copyIcon = QIcon::fromTheme("edit-copy", QIcon(":/images/copy.png"));
 	QAction *copyAct = new QAction(copyIcon, tr("&Copy"), this);
 	copyAct->setShortcuts(QKeySequence::Copy);
-	copyAct->setStatusTip(tr("Copy the current selection's contents to the "
-                             "clipboard"));
-	connect(copyAct, &QAction::triggered, textWidget, &QTextEdit::copy);
+	copyAct->setStatusTip(tr("Copy the current selection's contents to the clipboard"));
+	connect(copyAct, &QAction::triggered, m_textWidget, &TeletextWidget::copy);
 	editMenu->addAction(copyAct);
 	editToolBar->addAction(copyAct);
 
 	const QIcon pasteIcon = QIcon::fromTheme("edit-paste", QIcon(":/images/paste.png"));
 	QAction *pasteAct = new QAction(pasteIcon, tr("&Paste"), this);
 	pasteAct->setShortcuts(QKeySequence::Paste);
-	pasteAct->setStatusTip(tr("Paste the clipboard's contents into the current "
-                              "selection"));
-	connect(pasteAct, &QAction::triggered, textWidget, &QTextEdit::paste);
+	pasteAct->setStatusTip(tr("Paste the clipboard's contents into the current selection"));
+	connect(pasteAct, &QAction::triggered, m_textWidget, &TeletextWidget::paste);
 	editMenu->addAction(pasteAct);
 	editToolBar->addAction(pasteAct);
 
 	editMenu->addSeparator();
-*/
 #endif // !QT_NO_CLIPBOARD
 
 	QAction *insertBlankRowAct = editMenu->addAction(tr("Insert blank row"));
@@ -374,7 +468,7 @@ void MainWindow::createActions()
 	gridAct->setCheckable(true);
 	gridAct->setShortcut(QKeySequence(Qt::CTRL + Qt::Key_G));
 	gridAct->setStatusTip(tr("Toggle the text grid"));
-	connect(gridAct, &QAction::toggled, m_textWidget, &TeletextWidget::toggleGrid);
+	connect(gridAct, &QAction::toggled, m_textScene, &LevelOneScene::toggleGrid);
 
 	QAction *showCodesAct = viewMenu->addAction(tr("Show codes"));
 	showCodesAct->setCheckable(true);
@@ -415,6 +509,13 @@ void MainWindow::createActions()
 		borderGroup->addAction(m_borderActs[i]);
 	}
 
+	viewMenu->addSeparator();
+
+	m_smoothTransformAction = viewMenu->addAction(tr("Smooth font scaling"));
+	m_smoothTransformAction->setCheckable(true);
+	m_smoothTransformAction->setStatusTip(tr("Toggle smooth font scaling"));
+	connect(m_smoothTransformAction, &QAction::toggled, this, &MainWindow::setSmoothTransform);
+
 	QAction *zoomInAct = viewMenu->addAction(tr("Zoom In"));
 	zoomInAct->setShortcuts(QKeySequence::ZoomIn);
 	zoomInAct->setStatusTip(tr("Zoom in"));
@@ -552,7 +653,6 @@ void MainWindow::createActions()
 
 void MainWindow::setSceneDimensions()
 {
-	const float aspectRatioHorizontalScaling[4] = { 0.6, 0.6, 0.8, 0.5 };
 	const int topBottomBorders[3] = { 0, 10, 19 };
 	const int pillarBoxSizes[3] = { 672, 720, 854 };
 	const int leftRightBorders[3] = { 0, 24, 77 };
@@ -568,7 +668,7 @@ void MainWindow::setSceneDimensions()
 	else
 		newSceneWidth = m_textWidget->width() + leftRightBorders[m_viewBorder]*2;
 
-	m_textScene->setDimensions(newSceneWidth, 250+topBottomBorders[m_viewBorder]*2, m_textWidget->width());
+	m_textScene->setBorderDimensions(newSceneWidth, 250+topBottomBorders[m_viewBorder]*2, m_textWidget->width(), m_textWidget->pageRender()->leftSidePanelColumns(), m_textWidget->pageRender()->rightSidePanelColumns());
 	m_textView->setTransform(QTransform((1+(float)m_viewZoom/2)*aspectRatioHorizontalScaling[m_viewAspectRatio], 0, 0, 1+(float)m_viewZoom/2, 0, 0));
 }
 
@@ -576,20 +676,17 @@ void MainWindow::insertRow(bool copyRow)
 {
 	if (m_textWidget->document()->cursorRow() == 24)
 		return;
-	QUndoCommand *insertRowCommand = new InsertRowCommand(m_textWidget->document(), copyRow);
-	m_textWidget->document()->undoStack()->push(insertRowCommand);
+	m_textWidget->document()->undoStack()->push(new InsertRowCommand(m_textWidget->document(), copyRow));
 }
 
 void MainWindow::deleteRow()
 {
-	QUndoCommand *deleteRowCommand = new DeleteRowCommand(m_textWidget->document());
-	m_textWidget->document()->undoStack()->push(deleteRowCommand);
+	m_textWidget->document()->undoStack()->push(new DeleteRowCommand(m_textWidget->document()));
 }
 
 void MainWindow::insertSubPage(bool afterCurrentSubPage, bool copyCurrentSubPage)
 {
-	QUndoCommand *insertSubPageCommand = new InsertSubPageCommand(m_textWidget->document(), afterCurrentSubPage, copyCurrentSubPage);
-	m_textWidget->document()->undoStack()->push(insertSubPageCommand);
+	m_textWidget->document()->undoStack()->push(new InsertSubPageCommand(m_textWidget->document(), afterCurrentSubPage, copyCurrentSubPage));
 }
 
 void MainWindow::deleteSubPage()
@@ -612,16 +709,29 @@ void MainWindow::setAspectRatio(int newViewAspectRatio)
 	setSceneDimensions();
 }
 
+void MainWindow::setSmoothTransform(bool smoothTransform)
+{
+	m_viewSmoothTransform = smoothTransform;
+	if (smoothTransform)
+		m_textView->setRenderHints(QPainter::SmoothPixmapTransform);
+	else
+		m_textView->setRenderHints({ });
+}
+
 void MainWindow::zoomIn()
 {
 	if (m_viewZoom < 4)
 		m_viewZoom++;
+	else if (m_viewZoom < 12)
+		m_viewZoom += 2;
 	setSceneDimensions();
 }
 
 void MainWindow::zoomOut()
 {
-	if (m_viewZoom > 0)
+	if (m_viewZoom > 4)
+		m_viewZoom -= 2;
+	else if (m_viewZoom > 0)
 		m_viewZoom--;
 	setSceneDimensions();
 }
@@ -705,8 +815,12 @@ void MainWindow::readSettings()
 	m_viewAspectRatio = settings.value("aspectratio", 0).toInt();
 	m_viewAspectRatio = (m_viewAspectRatio < 0 || m_viewAspectRatio > 2) ? 0 : m_viewAspectRatio;
 	m_aspectRatioActs[m_viewAspectRatio]->setChecked(true);
+	m_viewSmoothTransform = settings.value("smoothTransform", 0).toBool();
+	m_smoothTransformAction->blockSignals(true);
+	m_smoothTransformAction->setChecked(m_viewSmoothTransform);
+	m_smoothTransformAction->blockSignals(false);
 	m_viewZoom = settings.value("zoom", 2).toInt();
-	m_viewZoom = (m_viewZoom < 0 || m_viewZoom > 4) ? 2 : m_viewZoom;
+	m_viewZoom = (m_viewZoom < 0 || m_viewZoom > 12) ? 2 : m_viewZoom;
 
 	// zoom 0 = 420,426px, 1 = 620,570px, 2 = 780,720px
 	if (geometry.isEmpty()) {
@@ -743,6 +857,7 @@ void MainWindow::writeSettings()
 	settings.setValue("windowState", saveState());
 	settings.setValue("border", m_viewBorder);
 	settings.setValue("aspectratio", m_viewAspectRatio);
+	settings.setValue("smoothTransform", m_viewSmoothTransform);
 	settings.setValue("zoom", m_viewZoom);
 }
 
@@ -750,7 +865,7 @@ bool MainWindow::maybeSave()
 {
 	if (m_textWidget->document()->undoStack()->isClean())
 		return true;
-	const QMessageBox::StandardButton ret = QMessageBox::warning(this, tr("QTeletextMaker"), tr("The document has been modified.\nDo you want to save your changes?"), QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel);
+	const QMessageBox::StandardButton ret = QMessageBox::warning(this, QApplication::applicationDisplayName(), tr("The document \"%1\" has been modified.\nDo you want to save your changes or discard them?").arg(QFileInfo(m_curFile).fileName()), QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel);
 	switch (ret) {
 		case QMessageBox::Save:
 			return save();
@@ -767,14 +882,27 @@ void MainWindow::loadFile(const QString &fileName)
 	int levelSeen;
 
 	QFile file(fileName);
-	if (!file.open(QFile::ReadOnly | QFile::Text)) {
-		QMessageBox::warning(this, tr("QTeletextMaker"), tr("Cannot read file %1:\n%2.").arg(QDir::toNativeSeparators(fileName), file.errorString()));
+	const QFileInfo fileInfo(file);
+	QIODevice::OpenMode fileOpenMode;
+
+	if (fileInfo.suffix() == "t42")
+		fileOpenMode = QFile::ReadOnly;
+	else
+		fileOpenMode = QFile::ReadOnly | QFile::Text;
+
+	if (!file.open(fileOpenMode)) {
+		QMessageBox::warning(this, QApplication::applicationDisplayName(), tr("Cannot read file %1:\n%2.").arg(QDir::toNativeSeparators(fileName), file.errorString()));
 		setCurrentFile(QString());
 		return;
 	}
 
 	QApplication::setOverrideCursor(Qt::WaitCursor);
-	loadTTI(&file, m_textWidget->document());
+
+	if (fileInfo.suffix() == "t42")
+		importT42(&file, m_textWidget->document());
+	else
+		loadTTI(&file, m_textWidget->document());
+
 	levelSeen = m_textWidget->document()->levelRequired();
 	m_levelRadioButton[levelSeen]->toggle();
 	m_textWidget->pageRender()->setRenderLevel(levelSeen);
@@ -872,13 +1000,13 @@ bool MainWindow::saveFile(const QString &fileName)
 	if (file.open(QFile::WriteOnly | QFile::Text)) {
 		saveTTI(file, *m_textWidget->document());
 		if (!file.commit())
-			errorMessage = tr("Cannot write file %1:\n%2.") .arg(QDir::toNativeSeparators(fileName), file.errorString());
+			errorMessage = tr("Cannot write file %1:\n%2.").arg(QDir::toNativeSeparators(fileName), file.errorString());
 	} else
 		errorMessage = tr("Cannot open file %1 for writing:\n%2.").arg(QDir::toNativeSeparators(fileName), file.errorString());
 	QApplication::restoreOverrideCursor();
 
 	if (!errorMessage.isEmpty()) {
-		QMessageBox::warning(this, tr("QTeletextMaker"), errorMessage);
+		QMessageBox::warning(this, QApplication::applicationDisplayName(), errorMessage);
 		return false;
 	}
 
@@ -887,6 +1015,82 @@ bool MainWindow::saveFile(const QString &fileName)
 	return true;
 }
 
+void MainWindow::exportT42()
+{
+	QString errorMessage;
+	QString exportFileName = m_curFile;
+
+	changeSuffixFromTTI(exportFileName, "t42");
+
+	exportFileName = QFileDialog::getSaveFileName(this, tr("Export t42"), exportFileName, "t42 stream (*.t42)");
+	if (exportFileName.isEmpty())
+		return;
+
+	QApplication::setOverrideCursor(Qt::WaitCursor);
+	QSaveFile file(exportFileName);
+	if (file.open(QFile::WriteOnly)) {
+		exportT42File(file, *m_textWidget->document());
+		if (!file.commit())
+			errorMessage = tr("Cannot write file %1:\n%2.").arg(QDir::toNativeSeparators(exportFileName), file.errorString());
+	} else
+		errorMessage = tr("Cannot open file %1 for writing:\n%2.").arg(QDir::toNativeSeparators(exportFileName), file.errorString());
+	QApplication::restoreOverrideCursor();
+
+	if (!errorMessage.isEmpty())
+		QMessageBox::warning(this, QApplication::applicationDisplayName(), errorMessage);
+}
+
+void MainWindow::exportM29()
+{
+	QString errorMessage;
+	QString exportFileName = m_curFile;
+
+	if (m_isUntitled || !QFileInfo(m_curFile).exists())
+		exportFileName = QString("P%1FF.tti").arg(m_textWidget->document()->pageNumber() >> 8, 1, 16);
+	else {
+		exportFileName = QFileInfo(m_curFile).fileName();
+		// Suggest a new filename to avoid clobbering the original file
+		if (QRegExp(("^[Pp]?[1-8][0-9A-Fa-f][0-9A-Fa-f]")).indexIn(exportFileName) != -1) {
+			// Page number forms start of file name, change it to xFF
+			if (exportFileName.at(0) == 'P' || exportFileName.at(0) == 'p') {
+				exportFileName[2] = 'F';
+				exportFileName[3] = 'F';
+			} else {
+				exportFileName[1] = 'F';
+				exportFileName[2] = 'F';
+			}
+		// No page number at start of file name. Try to insert "-m29" while preserving .tti(x) suffix
+		} else if (exportFileName.endsWith(".tti", Qt::CaseInsensitive)) {
+			exportFileName.chop(4);
+			exportFileName.append("-m29.tti");
+		} else if (exportFileName.endsWith(".ttix", Qt::CaseInsensitive)) {
+			exportFileName.chop(5);
+			exportFileName.append("-m29.ttix");
+		} else
+			// Shouldn't get here, bit of a messy escape but still better than clobbering the original file
+			exportFileName.append("-m29.tti");
+
+		exportFileName = QDir(QFileInfo(m_curFile).absoluteDir()).filePath(exportFileName);
+	}
+
+	exportFileName = QFileDialog::getSaveFileName(this, tr("Export M/29 tti"), exportFileName, "TTI teletext page (*.tti *.ttix)");
+	if (exportFileName.isEmpty())
+		return;
+
+	QApplication::setOverrideCursor(Qt::WaitCursor);
+	QSaveFile file(exportFileName);
+	if (file.open(QFile::WriteOnly | QFile::Text)) {
+		exportM29File(file, *m_textWidget->document());
+		if (!file.commit())
+			errorMessage = tr("Cannot write file %1:\n%2.").arg(QDir::toNativeSeparators(exportFileName), file.errorString());
+	} else
+		errorMessage = tr("Cannot open file %1 for writing:\n%2.").arg(QDir::toNativeSeparators(exportFileName), file.errorString());
+	QApplication::restoreOverrideCursor();
+
+	if (!errorMessage.isEmpty())
+		QMessageBox::warning(this, QApplication::applicationDisplayName(), errorMessage);
+}
+
 void MainWindow::setCurrentFile(const QString &fileName)
 {
 	static int sequenceNumber = 1;
@@ -926,6 +1130,8 @@ MainWindow *MainWindow::findMainWindow(const QString &fileName) const
 void MainWindow::updateCursorPosition()
 {
 	m_cursorPositionLabel->setText(QString("Row %1 Column %2").arg(m_textWidget->document()->cursorRow()).arg(m_textWidget->document()->cursorColumn()));
+	m_textScene->updateCursor();
+	m_textView->ensureVisible(m_textScene->cursorRectItem(), 16, 24);
 }
 
 void MainWindow::updatePageWidgets()

mainwindow.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -58,8 +58,11 @@ private slots:
 	void open();
 	bool save();
 	bool saveAs();
+	void exportT42();
 	void exportZXNet();
 	void exportEditTF();
+	void exportPNG();
+	void exportM29();
 	void updateRecentFileActions();
 	void openRecentFile();
 	void about();
@@ -74,6 +77,7 @@ private slots:
 	void setSceneDimensions();
 	void setBorder(int);
 	void setAspectRatio(int);
+	void setSmoothTransform(bool);
 	void zoomIn();
 	void zoomOut();
 	void zoomReset();
@@ -82,6 +86,7 @@ private slots:
 
 private:
 	enum { m_MaxRecentFiles = 10 };
+	const float aspectRatioHorizontalScaling[4] = { 0.6, 0.6, 0.8, 0.5 };
 
 	void init();
 	void createActions();
@@ -104,6 +109,7 @@ private:
 	QGraphicsView *m_textView;
 
 	int m_viewBorder, m_viewAspectRatio, m_viewZoom;
+	bool m_viewSmoothTransform;
 	PageOptionsDockWidget *m_pageOptionsDockWidget;
 	PageEnhancementsDockWidget *m_pageEnhancementsDockWidget;
 	X26DockWidget *m_x26DockWidget;
@@ -115,6 +121,7 @@ private:
 	QAction *m_deleteSubPageAction;
 	QAction *m_borderActs[3];
 	QAction *m_aspectRatioActs[4];
+	QAction *m_smoothTransformAction;
 
 	QLabel *m_subPageLabel, *m_cursorPositionLabel;
 	QToolButton *m_previousSubPageButton, *m_nextSubPageButton;

pagebase.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *

pagebase.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -37,8 +37,8 @@ public:
 
 	virtual QByteArray packet(int) const;
 	virtual QByteArray packet(int, int) const;
-	virtual bool packetNeeded(int i) const { return m_displayPackets[i] != nullptr; }
-	virtual bool packetNeeded(int i, int j) const { return m_designationPackets[i-26][j] != nullptr; }
+	virtual bool packetExists(int i) const { return m_displayPackets[i] != nullptr; }
+	virtual bool packetExists(int i, int j) const { return m_designationPackets[i-26][j] != nullptr; }
 	virtual bool setPacket(int, QByteArray);
 	virtual bool setPacket(int, int, QByteArray);
 //	bool deletePacket(int);

pageenhancementsdockwidget.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -25,6 +25,7 @@
 #include <QLineEdit>
 #include <QMap>
 #include <QPair>
+#include <QRegExpValidator>
 #include <QSpinBox>
 #include <QString>
 
@@ -47,12 +48,9 @@ PageEnhancementsDockWidget::PageEnhancementsDockWidget(TeletextWidget *parent):
 	x28Layout->addWidget(new QLabel(tr("Default screen colour")), 0, 0, 1, 1);
 	x28Layout->addWidget(new QLabel(tr("Default row colour")), 1, 0, 1, 1);
 	m_defaultScreenColourCombo = new QComboBox;
+	m_defaultScreenColourCombo->setModel(m_parentMainWidget->document()->clutModel());
 	m_defaultRowColourCombo = new QComboBox;
-	for (int r=0; r<=3; r++)
-		for (int c=0; c<=7; c++) {
-			m_defaultScreenColourCombo->addItem(tr("CLUT %1:%2").arg(r).arg(c));
-			m_defaultRowColourCombo->addItem(tr("CLUT %1:%2").arg(r).arg(c));
-		}
+	m_defaultRowColourCombo->setModel(m_parentMainWidget->document()->clutModel());
 	x28Layout->addWidget(m_defaultScreenColourCombo, 0, 1, 1, 1, Qt::AlignTop);
 	connect(m_defaultScreenColourCombo, QOverload<int>::of(&QComboBox::currentIndexChanged), [=](int index){ m_parentMainWidget->setDefaultScreenColour(index); });
 	x28Layout->addWidget(m_defaultRowColourCombo, 1, 1, 1, 1, Qt::AlignTop);
@@ -117,6 +115,8 @@ PageEnhancementsDockWidget::PageEnhancementsDockWidget(TeletextWidget *parent):
 	level3p5OnlyLabel->setAlignment(Qt::AlignCenter);
 	x27Layout->addWidget(level3p5OnlyLabel, 5, 0, 1, 5);
 
+	m_pageNumberValidator = new QRegExpValidator(QRegExp("[1-8][0-9A-Fa-f][0-9A-Fa-f]"), this);
+
 	for (int i=0; i<8; i++) {
 		if (i < 4) {
 			// Required at which Levels
@@ -139,8 +139,8 @@ PageEnhancementsDockWidget::PageEnhancementsDockWidget(TeletextWidget *parent):
 		// Page link
 		m_composeLinkPageNumberLineEdit[i] = new QLineEdit("100");
 		m_composeLinkPageNumberLineEdit[i]->setMaxLength(3);
-		m_composeLinkPageNumberLineEdit[i]->setInputMask("DHH");
-		// TODO restrict first digit of page number to 1-8
+		m_composeLinkPageNumberLineEdit[i]->setInputMask(">DHH");
+		m_composeLinkPageNumberLineEdit[i]->setValidator(m_pageNumberValidator);
 		x27Layout->addWidget(m_composeLinkPageNumberLineEdit[i], i+(i<4 ? 1 : 2), 3, 1, 1);
 		connect(m_composeLinkPageNumberLineEdit[i], &QLineEdit::textEdited, [=](QString value) { setComposeLinkPageNumber(i, value); } );
 

pageenhancementsdockwidget.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -24,6 +24,7 @@
 #include <QComboBox>
 #include <QDockWidget>
 #include <QLineEdit>
+#include <QRegExpValidator>
 #include <QSpinBox>
 #include <QString>
 
@@ -51,6 +52,8 @@ private:
 	QCheckBox *m_composeLinkLevelCheckbox[4][2]; // For links 0-3
 	QComboBox *m_composeLinkFunctionComboBox[4]; // For links 4-7; remember to subtract 4!
 	QLineEdit *m_composeLinkPageNumberLineEdit[8], *m_composeLinkSubPageNumbersLineEdit[8];
+
+	QRegExpValidator *m_pageNumberValidator;
 };
 
 #endif

pageoptionsdockwidget.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -24,6 +24,7 @@
 #include <QHBoxLayout>
 #include <QLabel>
 #include <QLineEdit>
+#include <QRegExpValidator>
 #include <QSpinBox>
 #include <QVBoxLayout>
 
@@ -40,14 +41,16 @@ PageOptionsDockWidget::PageOptionsDockWidget(TeletextWidget *parent): QDockWidge
 	this->setWindowTitle("Page options");
 
 	// Page number
+	m_pageNumberValidator = new QRegExpValidator(QRegExp("[1-8][0-9A-Fa-f][0-9A-Fa-f]"), this);
+
 	QHBoxLayout *pageNumberLayout = new QHBoxLayout;
 	pageNumberLayout->addWidget(new QLabel(tr("Page number")));
 	m_pageNumberEdit = new QLineEdit("100");
 	m_pageNumberEdit->setMaxLength(3);
-	m_pageNumberEdit->setInputMask("DHH");
-	//TODO restrict first digit of page number to 1-8
+	m_pageNumberEdit->setInputMask(">DHH");
+	m_pageNumberEdit->setValidator(m_pageNumberValidator);
 	pageNumberLayout->addWidget(m_pageNumberEdit);
-	connect(m_pageNumberEdit, &QLineEdit::textEdited, m_parentMainWidget->document(), &TeletextDocument::setPageNumber);
+	connect(m_pageNumberEdit, &QLineEdit::textEdited, m_parentMainWidget->document(), &TeletextDocument::setPageNumberFromString);
 
 	pageOptionsLayout->addLayout(pageNumberLayout);
 
@@ -66,8 +69,8 @@ PageOptionsDockWidget::PageOptionsDockWidget(TeletextWidget *parent): QDockWidge
 		fastTextLayout->addWidget(new QLabel(fastTextLabel[i]), 0, i, 1, 1, Qt::AlignCenter);
 		m_fastTextEdit[i] = new QLineEdit;
 		m_fastTextEdit[i]->setMaxLength(3);
-		m_fastTextEdit[i]->setInputMask("DHH");
-		//TODO restrict first digit of page number to 1-8
+		m_fastTextEdit[i]->setInputMask(">DHH");
+		m_fastTextEdit[i]->setValidator(m_pageNumberValidator);
 		fastTextLayout->addWidget(m_fastTextEdit[i], 1, i, 1, 1);
 		connect(m_fastTextEdit[i], &QLineEdit::textEdited, [=](QString value) { setFastTextLinkPageNumber(i, value); } );
 	}

pageoptionsdockwidget.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -24,6 +24,7 @@
 #include <QComboBox>
 #include <QDockWidget>
 #include <QLineEdit>
+#include <QRegExpValidator>
 #include <QSpinBox>
 
 #include "mainwidget.h"
@@ -45,6 +46,8 @@ private:
 	QComboBox *m_defaultRegionCombo, *m_defaultNOSCombo, *m_secondRegionCombo, *m_secondNOSCombo;
 	QLineEdit *m_fastTextEdit[6];
 
+	QRegExpValidator *m_pageNumberValidator;
+
 	void addRegionList(QComboBox *);
 	void setFastTextLinkPageNumber(int, const QString &);
 	void setDefaultRegion();

pagex26base.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -74,7 +74,7 @@ void PageX26Base::setEnhancementListFromPacket(int packetNumber, QByteArray pack
 		newX26Triplet.setAddress(packetContents.at(i*3+1) & 0x3f);
 		newX26Triplet.setMode(packetContents.at(i*3+2) & 0x1f);
 		newX26Triplet.setData(((packetContents.at(i*3+3) & 0x3f) << 1) | ((packetContents.at(i*3+2) & 0x20) >> 5));
-		m_enhancements[enhanceListPointer] = newX26Triplet;
+		m_enhancements.replace(enhanceListPointer, newX26Triplet);
 	}
 	if (newX26Triplet.mode() == 0x1f && newX26Triplet.address() == 0x3f && newX26Triplet.data() & 0x01)
 		// Last triplet was a Termination Marker (without ..follows) so clean up the repeated ones

pagex26base.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -31,14 +31,15 @@ class PageX26Base : public PageBase //: public QObject
 	//Q_OBJECT
 
 public:
-	QList<X26Triplet> *enhancements() { return &m_enhancements; };
+	X26TripletList *enhancements() { return &m_enhancements; };
+	virtual int maxEnhancements() const =0;
 
 protected:
 	QByteArray packetFromEnhancementList(int) const;
 	void setEnhancementListFromPacket(int, QByteArray);
 	bool packetFromEnhancementListNeeded(int n) const { return ((m_enhancements.size()+12) / 13) > n; };
 
-	QList<X26Triplet> m_enhancements;
+	X26TripletList m_enhancements;
 	const X26Triplet m_paddingX26Triplet { 41, 0x1e, 0 };
 };
 

palettedockwidget.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -108,14 +108,11 @@ void PaletteDockWidget::selectColour(int colourIndex)
 {
     const QColor newColour = QColorDialog::getColor(m_parentMainWidget->document()->currentSubPage()->CLUTtoQColor(colourIndex), this, "Select Colour");
 
-	if (newColour.isValid()) {
-		QUndoCommand *setColourCommand = new SetColourCommand(m_parentMainWidget->document(), colourIndex, ((newColour.red() & 0xf0) << 4) | (newColour.green() & 0xf0) | ((newColour.blue() & 0xf0) >> 4));
-		m_parentMainWidget->document()->undoStack()->push(setColourCommand);
-	}
+	if (newColour.isValid())
+		m_parentMainWidget->document()->undoStack()->push(new SetColourCommand(m_parentMainWidget->document(), colourIndex, ((newColour.red() & 0xf0) << 4) | (newColour.green() & 0xf0) | ((newColour.blue() & 0xf0) >> 4)));
 }
 
 void PaletteDockWidget::resetCLUT(int colourTable)
 {
-	QUndoCommand *resetCLUTCommand = new ResetCLUTCommand(m_parentMainWidget->document(), colourTable);
-	m_parentMainWidget->document()->undoStack()->push(resetCLUTCommand);
+	m_parentMainWidget->document()->undoStack()->push(new ResetCLUTCommand(m_parentMainWidget->document(), colourTable));
 }

palettedockwidget.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *

qteletextmaker.pro

@@ -2,6 +2,7 @@ QT += widgets
 requires(qtConfig(filedialog))
 
 HEADERS       = document.h \
+                hamming.h \
                 keymap.h \
                 levelonecommands.h \
                 levelonepage.h \

render.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -26,15 +26,30 @@
 
 #include "render.h"
 
+int TeletextFontBitmap::s_instances = 0;
+
+QBitmap *TeletextFontBitmap::s_fontBitmap = nullptr;
+
+TeletextFontBitmap::TeletextFontBitmap()
+{
+	if (s_instances == 0)
+		s_fontBitmap = new QBitmap(":/images/teletextfont.png");
+	s_instances++;
+}
+
+TeletextFontBitmap::~TeletextFontBitmap()
+{
+	s_instances--;
+	if (s_instances == 0)
+		delete s_fontBitmap;
+}
+
 TeletextPageRender::TeletextPageRender()
 {
-	QPainter pixmapPainter;
-
-	m_fontBitmap = new QBitmap(":/images/teletextfont.png");
 	for (int i=0; i<6; i++)
 		m_pagePixmap[i] = new QPixmap(864, 250);
 	m_pagePixmap[0]->fill(Qt::transparent);
-	m_grid = m_mix = m_reveal = m_showCodes = false;
+	m_mix = m_reveal = m_showCodes = false;
 	m_renderLevel = 0;
 	m_flashRequired = 0;
 	m_finalFullScreenColour = 0;
@@ -58,7 +73,6 @@ TeletextPageRender::~TeletextPageRender()
 	}
 	for (int i=0; i<6; i++)
 		delete m_pagePixmap[i];
-	delete m_fontBitmap;
 }
 
 void TeletextPageRender::setTeletextPage(LevelOnePage *newCurrentPage)
@@ -92,7 +106,6 @@ void TeletextPageRender::setRenderLevel(int newRenderLevel)
 	renderPage();
 }
 
-void TeletextPageRender::setGrid(bool newGrid) { m_grid = newGrid; }
 void TeletextPageRender::setShowCodes(bool newShowCodes)
 {
 	m_showCodes = newShowCodes;
@@ -164,7 +177,7 @@ void TeletextPageRender::buildEnhanceMap(TextLayer *enhanceLayer, int tripletNum
 						if ((x26Triplet->address() & 0x18) == 0x08) {
 							// Local Object
 							// Check if the pointer in the Invocation triplet is valid
-							// Can't point to triplets 13-15; only 12 triplets per packet
+							// Can't point to triplets 13-15; only triplets 0-12 per packet
 							if ((x26Triplet->data() & 0x0f) > 12)
 								break;
 							int tripletPointer = ((x26Triplet->data() >> 4) | ((x26Triplet->address() & 1) << 3)) * 13 + (x26Triplet->data() & 0x0f);
@@ -174,12 +187,15 @@ void TeletextPageRender::buildEnhanceMap(TextLayer *enhanceLayer, int tripletNum
 							// Check if we're pointing to an actual Object Definition of the same type
 							if ((x26Triplet->mode() | 0x04) != m_levelOnePage->enhancements()->at(tripletPointer).mode())
 								break;
-							// The Object Definition can't declare it's at triplet 13-15; only 12 triplets per packet
+							// The Object Definition can't declare it's at triplet 13-15; only triplets 0-12 per packet
 							if ((m_levelOnePage->enhancements()->at(tripletPointer).data() & 0x0f) > 12)
 								break;
 							// Check if the Object Definition triplet is where it declares it is
 							if ((((m_levelOnePage->enhancements()->at(tripletPointer).data() >> 4) | ((m_levelOnePage->enhancements()->at(tripletPointer).address() & 1) << 3)) * 13 + (m_levelOnePage->enhancements()->at(tripletPointer).data() & 0x0f)) != tripletPointer)
 								break;
+							// Check if (sub)Object type can be invoked by Object type we're within
+							if (enhanceLayer->objectType() >= (x26Triplet->mode() & 0x03))
+								break;
 							// Is the object required at the current presentation Level?
 							if (m_renderLevel == 2 && (m_levelOnePage->enhancements()->at(tripletPointer).address() & 0x08) == 0x00)
 								break;
@@ -188,7 +204,7 @@ void TeletextPageRender::buildEnhanceMap(TextLayer *enhanceLayer, int tripletNum
 							EnhanceLayer *newLayer = new EnhanceLayer;
 							m_textLayer.push_back(newLayer);
 							newLayer->setObjectType(x26Triplet->mode() & 0x03);
-							newLayer->setOrigin(activePosition.row()+originModifierR, activePosition.column()+originModifierC);
+							newLayer->setOrigin(enhanceLayer->originR() + activePosition.row() + originModifierR, enhanceLayer->originC() + activePosition.column() + originModifierC);
 							buildEnhanceMap(newLayer, tripletPointer+1);
 						} else
 							qDebug("POP or GPOP");
@@ -235,7 +251,6 @@ void TeletextPageRender::buildEnhanceMap(TextLayer *enhanceLayer, int tripletNum
 
 void TeletextPageRender::decodePage()
 {
-	QPainter pixmapPainter;
 	int currentFullRowColour, downwardsFullRowColour;
 	int renderedFullScreenColour;
 
@@ -257,7 +272,7 @@ void TeletextPageRender::decodePage()
 		setFullRowColour(r ,downwardsFullRowColour);
 
 	m_textLayer[1]->enhanceMap.clear();
-	if (m_renderLevel == 0 || m_levelOnePage->enhancements()->empty())
+	if (m_renderLevel == 0 || m_levelOnePage->enhancements()->isEmpty())
 		return;
 
 	m_textLayer[1]->setFullScreenColour(-1);
@@ -346,10 +361,10 @@ void TeletextPageRender::renderPage(int r)
 				pixmapPainter.setBackground(QBrush(backQColour));
 			}
 			pixmapPainter.setPen(foreQColour);
-			pixmapPainter.drawPixmap(c*12, r*10, charWidth, charHeight, *m_fontBitmap, (resultCharacter.code-32)*12, resultCharacter.set*10, 12, 10);
+			pixmapPainter.drawPixmap(c*12, r*10, charWidth, charHeight, *m_fontBitmap.rawBitmap(), (resultCharacter.code-32)*12, resultCharacter.set*10, 12, 10);
 			if (resultCharacter.diacritical) {
 				pixmapPainter.setBackgroundMode(Qt::TransparentMode);
-				pixmapPainter.drawPixmap(c*12, r*10, charWidth, charHeight, *m_fontBitmap, 384+resultCharacter.diacritical*12, 70, 12, 10);
+				pixmapPainter.drawPixmap(c*12, r*10, charWidth, charHeight, *m_fontBitmap.rawBitmap(), 384+resultCharacter.diacritical*12, 70, 12, 10);
 				pixmapPainter.setBackgroundMode(Qt::OpaqueMode);
 			}
 		}
@@ -360,12 +375,6 @@ void TeletextPageRender::renderPage(int r)
 			else
 				pixmapPainter.drawRect(c*12, r*10+18, charWidth-1, 1);
 		}
-
-		if (m_grid) {
-			pixmapPainter.setPen(QColor(128, 128, 128, (c <= 39) ? 192 : 64));
-			pixmapPainter.drawRect(c*12, r*10, 11, 9);
-		}
-
 	};
 
 	pixmapPainter.begin(m_pagePixmap[0]);
@@ -487,7 +496,7 @@ void TeletextPageRender::renderPage(int r)
 		if (m_showCodes && c < 40 && m_levelOnePage->character(r, c)<0x20 && !m_level1Layer.isRowBottomHalf(r) && !m_cell[r][c].bottomHalf) {
 			pixmapPainter.setBackground(QBrush(QColor(0, 0, 0, 128)));
 			pixmapPainter.setPen(QColor(255, 255, 255, 224));
-			pixmapPainter.drawPixmap(c*12, r*10, 12, 10, *m_fontBitmap, (m_levelOnePage->character(r, c)+32)*12, 250, 12, 10);
+			pixmapPainter.drawPixmap(c*12, r*10, 12, 10, *m_fontBitmap.rawBitmap(), (m_levelOnePage->character(r, c)+32)*12, 250, 12, 10);
 		}
 
 		if (resultAttributes.display.doubleHeight)

render.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -107,6 +107,8 @@ public:
 	virtual int fullRowColour(int) const =0;
 	virtual bool fullRowDownwards(int) const =0;
 	virtual int objectType() const =0;
+	virtual int originR() const { return 0; };
+	virtual int originC() const { return 0; };
 	void setFullScreenColour(int);
 	void setFullRowColour(int, int, bool);
 
@@ -131,6 +133,8 @@ public:
 	int fullRowColour(int r) const { return m_layerFullRowColour[r]; };
 	bool fullRowDownwards(int r) const { return m_layerFullRowDownwards[r]; };
 	int objectType() const { return m_objectType; };
+	int originR() const { return m_originR; };
+	int originC() const { return m_originC; };
 	void setObjectType(int);
 	void setOrigin(int, int);
 
@@ -175,6 +179,18 @@ private:
 	enum rowHeightEnum { RHnormal=-1, RHtophalf, RHbottomhalf } m_rowHeight[25];
 };
 
+class TeletextFontBitmap
+{
+public:
+	TeletextFontBitmap();
+	~TeletextFontBitmap();
+	QBitmap *rawBitmap() const { return s_fontBitmap; }
+
+private:
+	static int s_instances;
+	static QBitmap* s_fontBitmap;
+};
+
 class TeletextPageRender : public QObject
 {
 	Q_OBJECT
@@ -185,6 +201,8 @@ public:
 	void decodePage();
 	void renderPage();
 	void renderPage(int r);
+	bool mix() const { return m_mix; };
+	bool showCodes() const { return m_showCodes; };
 	void setTeletextPage(LevelOnePage *);
 	void updateSidePanels();
 	void buildEnhanceMap(TextLayer *, int=0);
@@ -193,7 +211,6 @@ public:
 	int level1CharSet(int r, int c) const { return m_cell[r][c].level1CharSet; };
 	int leftSidePanelColumns() const { return m_leftSidePanelColumns; };
 	int rightSidePanelColumns() const { return m_rightSidePanelColumns; };
-	void setGrid(bool);
 
 public slots:
 	void setReveal(bool);
@@ -212,12 +229,12 @@ protected:
 	inline void setFullScreenColour(int);
 	inline void setFullRowColour(int, int);
 
-	QBitmap* m_fontBitmap;
+	TeletextFontBitmap m_fontBitmap;
 	QPixmap* m_pagePixmap[6];
 	int m_finalFullScreenColour, m_renderLevel;
 	QColor m_finalFullScreenQColor;
 	int m_leftSidePanelColumns, m_rightSidePanelColumns;
-	bool m_reveal, m_mix, m_grid, m_showCodes;
+	bool m_reveal, m_mix, m_showCodes;
 	Level1Layer m_level1Layer;
 	std::vector<TextLayer *> m_textLayer;
 	const int m_foregroundRemap[8] = { 0,  0,  0,  8,  8, 16, 16, 16 };

x26commands.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -50,12 +50,25 @@ void InsertTripletCommand::redo()
 	for (int i=0; i<m_count; i++)
 		m_teletextDocument->currentSubPage()->enhancements()->insert(m_row+i, m_insertedTriplet);
 
+	if (!changingSubPage)
+		m_x26Model->endInsertRows();
+
+	// Preserve pointers to local object definitions that have moved
+	for (int i=0; i<m_teletextDocument->currentSubPage()->enhancements()->size(); i++) {
+		X26Triplet triplet = m_teletextDocument->currentSubPage()->enhancements()->at(i);
+
+		if (triplet.modeExt() >= 0x11 && triplet.modeExt() <= 0x13 && ((triplet.address() & 0x18) == 0x08) && triplet.objectLocalIndex() >= m_row) {
+			triplet.setObjectLocalIndex(triplet.objectLocalIndex() + m_count);
+			m_teletextDocument->currentSubPage()->enhancements()->replace(i, triplet);
+			if (!changingSubPage)
+				m_x26Model->emit dataChanged(m_x26Model->createIndex(i, 0), m_x26Model->createIndex(i, 3));
+		}
+	}
+
 	if (changingSubPage)
 		m_teletextDocument->emit subPageSelected();
-	else {
-		m_x26Model->endInsertRows();
+	else
 		m_teletextDocument->emit refreshNeeded();
-	}
 
 	if (m_firstDo)
 		m_firstDo = false;
@@ -76,12 +89,25 @@ void InsertTripletCommand::undo()
 	for (int i=0; i<m_count; i++)
 		m_teletextDocument->currentSubPage()->enhancements()->removeAt(m_row);
 
+	if (!changingSubPage)
+		m_x26Model->endRemoveRows();
+
+	// Preserve pointers to local object definitions that have moved
+	for (int i=0; i<m_teletextDocument->currentSubPage()->enhancements()->size(); i++) {
+		X26Triplet triplet = m_teletextDocument->currentSubPage()->enhancements()->at(i);
+
+		if (triplet.modeExt() >= 0x11 && triplet.modeExt() <= 0x13 && ((triplet.address() & 0x18) == 0x08) && triplet.objectLocalIndex() >= m_row) {
+			triplet.setObjectLocalIndex(triplet.objectLocalIndex() - m_count);
+			m_teletextDocument->currentSubPage()->enhancements()->replace(i, triplet);
+			if (!changingSubPage)
+				m_x26Model->emit dataChanged(m_x26Model->createIndex(i, 0), m_x26Model->createIndex(i, 3));
+		}
+	}
+
 	if (changingSubPage)
 		m_teletextDocument->emit subPageSelected();
-	else {
-		m_x26Model->endRemoveRows();
+	else
 		m_teletextDocument->emit refreshNeeded();
-	}
 }
 
 
@@ -101,15 +127,35 @@ DeleteTripletCommand::DeleteTripletCommand(TeletextDocument *teletextDocument, X
 
 void DeleteTripletCommand::redo()
 {
-	m_teletextDocument->emit aboutToChangeSubPage();
-	m_teletextDocument->selectSubPageIndex(m_subPageIndex);
+	bool changingSubPage = (m_teletextDocument->currentSubPageIndex() != m_subPageIndex);
+
+	if (changingSubPage) {
+		m_teletextDocument->emit aboutToChangeSubPage();
+		m_teletextDocument->selectSubPageIndex(m_subPageIndex);
+	} else
+		m_x26Model->beginRemoveRows(QModelIndex(), m_row, m_row+m_count-1);
 
-	m_x26Model->beginRemoveRows(QModelIndex(), m_row, m_row+m_count-1);
 	for (int i=0; i<m_count; i++)
 		m_teletextDocument->currentSubPage()->enhancements()->removeAt(m_row);
-	m_x26Model->endRemoveRows();
 
-	m_teletextDocument->emit subPageSelected();
+	if (!changingSubPage)
+		m_x26Model->endRemoveRows();
+
+	// Preserve pointers to local object definitions that have moved
+	for (int i=0; i<m_teletextDocument->currentSubPage()->enhancements()->size(); i++) {
+		X26Triplet triplet = m_teletextDocument->currentSubPage()->enhancements()->at(i);
+
+		if (triplet.modeExt() >= 0x11 && triplet.modeExt() <= 0x13 && ((triplet.address() & 0x18) == 0x08) && triplet.objectLocalIndex() >= m_row) {
+			triplet.setObjectLocalIndex(triplet.objectLocalIndex() - m_count);
+			m_teletextDocument->currentSubPage()->enhancements()->replace(i, triplet);
+			m_x26Model->emit dataChanged(m_x26Model->createIndex(i, 0), m_x26Model->createIndex(i, 3));
+		}
+	}
+
+	if (changingSubPage)
+		m_teletextDocument->emit subPageSelected();
+	else
+		m_teletextDocument->emit refreshNeeded();
 }
 
 void DeleteTripletCommand::undo()
@@ -125,12 +171,25 @@ void DeleteTripletCommand::undo()
 	for (int i=0; i<m_count; i++)
 		m_teletextDocument->currentSubPage()->enhancements()->insert(m_row+i, m_deletedTriplet);
 
+	if (!changingSubPage)
+		m_x26Model->endInsertRows();
+
+	// Preserve pointers to local object definitions that have moved
+	for (int i=0; i<m_teletextDocument->currentSubPage()->enhancements()->size(); i++) {
+		X26Triplet triplet = m_teletextDocument->currentSubPage()->enhancements()->at(i);
+
+		if (triplet.modeExt() >= 0x11 && triplet.modeExt() <= 0x13 && ((triplet.address() & 0x18) == 0x08) && triplet.objectLocalIndex() >= m_row) {
+			triplet.setObjectLocalIndex(triplet.objectLocalIndex() + m_count);
+			m_teletextDocument->currentSubPage()->enhancements()->replace(i, triplet);
+			if (!changingSubPage)
+				m_x26Model->emit dataChanged(m_x26Model->createIndex(i, 0), m_x26Model->createIndex(i, 3));
+		}
+	}
+
 	if (changingSubPage)
 		m_teletextDocument->emit subPageSelected();
-	else {
-		m_x26Model->endInsertRows();
+	else
 		m_teletextDocument->emit refreshNeeded();
-	}
 
 	m_teletextDocument->emit tripletCommandHighlight(m_row);
 }
@@ -164,7 +223,7 @@ void EditTripletCommand::redo()
 	if (m_teletextDocument->currentSubPageIndex() != m_subPageIndex)
 		m_teletextDocument->selectSubPageIndex(m_subPageIndex, true);
 
-	m_teletextDocument->currentSubPage()->enhancements()->operator[](m_row) = m_newTriplet;
+	m_teletextDocument->currentSubPage()->enhancements()->replace(m_row, m_newTriplet);
 	m_x26Model->emit dataChanged(m_x26Model->createIndex(m_row, 0), m_x26Model->createIndex(m_row, 3), {m_role});
 	m_teletextDocument->emit refreshNeeded();
 
@@ -179,7 +238,7 @@ void EditTripletCommand::undo()
 	if (m_teletextDocument->currentSubPageIndex() != m_subPageIndex)
 		m_teletextDocument->selectSubPageIndex(m_subPageIndex, true);
 
-	m_teletextDocument->currentSubPage()->enhancements()->operator[](m_row) = m_oldTriplet;
+	m_teletextDocument->currentSubPage()->enhancements()->replace(m_row, m_oldTriplet);
 	m_x26Model->emit dataChanged(m_x26Model->createIndex(m_row, 0), m_x26Model->createIndex(m_row, 3), {m_role});
 	m_teletextDocument->emit refreshNeeded();
 	m_teletextDocument->emit tripletCommandHighlight(m_row);

x26commands.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *

x26dockwidget.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -17,6 +17,7 @@
  * along with QTeletextMaker.  If not, see <https://www.gnu.org/licenses/>.
  */
 
+#include <QAbstractListModel>
 #include <QActionGroup>
 #include <QButtonGroup>
 #include <QCheckBox>
@@ -34,8 +35,42 @@
 #include <QToolButton>
 #include <QVBoxLayout>
 
+#include "render.h"
 #include "x26dockwidget.h"
 
+CharacterListModel::CharacterListModel(QObject *parent): QAbstractListModel(parent)
+{
+	m_characterSet = 0;
+}
+
+int CharacterListModel::rowCount(const QModelIndex & /*parent*/) const
+{
+	return 96;
+}
+
+QVariant CharacterListModel::data(const QModelIndex &index, int role) const
+{
+	if (!index.isValid())
+		return QVariant();
+
+	if (role == Qt::DisplayRole)
+		return QString("0x%1").arg(index.row()+0x20, 2, 16);
+
+	if (role == Qt::DecorationRole)
+		return m_fontBitmap.rawBitmap()->copy(index.row()*12, m_characterSet*10, 12, 10);
+
+	return QVariant();
+}
+
+void CharacterListModel::setCharacterSet(int characterSet)
+{
+	if (characterSet != m_characterSet) {
+		m_characterSet = characterSet;
+		emit dataChanged(createIndex(0, 0), createIndex(95, 0), QVector<int>(Qt::DecorationRole));
+	}
+}
+
+
 X26DockWidget::X26DockWidget(TeletextWidget *parent): QDockWidget(parent)
 {
 	QVBoxLayout *x26Layout = new QVBoxLayout;
@@ -70,16 +105,6 @@ X26DockWidget::X26DockWidget(TeletextWidget *parent): QDockWidget(parent)
 	// "Cooked" or user-friendly triplet type, row and column selection
 	QHBoxLayout *cookedTripletLayout = new QHBoxLayout;
 
-	m_cookedModeTypeComboBox = new QComboBox;
-	m_cookedModeTypeComboBox->addItem("Set Active Position");
-	m_cookedModeTypeComboBox->addItem("Row triplet");
-	m_cookedModeTypeComboBox->addItem("Column triplet");
-	m_cookedModeTypeComboBox->addItem("Object");
-	m_cookedModeTypeComboBox->addItem("Terminator");
-	m_cookedModeTypeComboBox->addItem("PDC/reserved");
-	cookedTripletLayout->addWidget(m_cookedModeTypeComboBox);
-	connect(m_cookedModeTypeComboBox, QOverload<int>::of(&QComboBox::activated), this, &X26DockWidget::updateCookedModeFromCookedType);
-
 	// Cooked row spinbox
 	QLabel *rowLabel = new QLabel(tr("Row"));
 	rowLabel->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Preferred);
@@ -102,10 +127,81 @@ X26DockWidget::X26DockWidget(TeletextWidget *parent): QDockWidget(parent)
 	connect(m_cookedColumnSpinBox, QOverload<int>::of(&QSpinBox::valueChanged), this, &X26DockWidget::cookedColumnSpinBoxChanged);
 
 	// Cooked triplet mode
-	m_cookedModeComboBox = new QComboBox;
-	m_cookedModeComboBox->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
-	cookedTripletLayout->addWidget(m_cookedModeComboBox);
-	connect(m_cookedModeComboBox, QOverload<int>::of(&QComboBox::activated), this, &X26DockWidget::cookedModeComboBoxChanged);
+	QLabel *modeLabel = new QLabel(tr("Mode"));
+	modeLabel->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Preferred);
+	cookedTripletLayout->addWidget(modeLabel);
+	m_cookedModePushButton = new QPushButton;
+	cookedTripletLayout->addWidget(m_cookedModePushButton);
+
+	auto newModeMenuAction=[&](QMenu *menu, int mode)
+	{
+		QAction *action = menu->addAction(m_x26Model->modeTripletName(mode));
+		connect(action, &QAction::triggered, [=]() { cookedModeMenuSelected(mode); });
+	};
+
+	// Cooked triplet menu
+	m_cookedModeMenu = new QMenu(this);
+	newModeMenuAction(m_cookedModeMenu, 0x04);
+	QMenu *rowTripletSubMenu = m_cookedModeMenu->addMenu(tr("Row triplet"));
+	newModeMenuAction(rowTripletSubMenu, 0x00);
+	newModeMenuAction(rowTripletSubMenu, 0x01);
+	newModeMenuAction(rowTripletSubMenu, 0x07);
+	newModeMenuAction(rowTripletSubMenu, 0x18);
+	QMenu *columnTripletSubMenu = m_cookedModeMenu->addMenu(tr("Column triplet"));
+	newModeMenuAction(columnTripletSubMenu, 0x20);
+	newModeMenuAction(columnTripletSubMenu, 0x23);
+	newModeMenuAction(columnTripletSubMenu, 0x27);
+	newModeMenuAction(columnTripletSubMenu, 0x2c);
+	newModeMenuAction(columnTripletSubMenu, 0x2e);
+	newModeMenuAction(columnTripletSubMenu, 0x28);
+	columnTripletSubMenu->addSeparator();
+	newModeMenuAction(columnTripletSubMenu, 0x29);
+	newModeMenuAction(columnTripletSubMenu, 0x2f);
+	newModeMenuAction(columnTripletSubMenu, 0x21);
+	newModeMenuAction(columnTripletSubMenu, 0x22);
+	newModeMenuAction(columnTripletSubMenu, 0x2b);
+	newModeMenuAction(columnTripletSubMenu, 0x2d);
+	QMenu *diacriticalSubMenu = columnTripletSubMenu->addMenu(tr("G0 diacritical"));
+	for (int i=0; i<16; i++)
+		newModeMenuAction(diacriticalSubMenu, 0x30 + i);
+	QMenu *objectSubMenu = m_cookedModeMenu->addMenu(tr("Object"));
+	newModeMenuAction(objectSubMenu, 0x10);
+	newModeMenuAction(objectSubMenu, 0x11);
+	newModeMenuAction(objectSubMenu, 0x12);
+	newModeMenuAction(objectSubMenu, 0x13);
+	newModeMenuAction(objectSubMenu, 0x15);
+	newModeMenuAction(objectSubMenu, 0x16);
+	newModeMenuAction(objectSubMenu, 0x17);
+	newModeMenuAction(m_cookedModeMenu, 0x1f);
+	m_cookedModeMenu->addSeparator();
+	QMenu *pdcSubMenu = m_cookedModeMenu->addMenu(tr("PDC/reserved"));
+	newModeMenuAction(pdcSubMenu, 0x08);
+	newModeMenuAction(pdcSubMenu, 0x09);
+	newModeMenuAction(pdcSubMenu, 0x0a);
+	newModeMenuAction(pdcSubMenu, 0x0b);
+	newModeMenuAction(pdcSubMenu, 0x0c);
+	newModeMenuAction(pdcSubMenu, 0x0d);
+	newModeMenuAction(pdcSubMenu, 0x26);
+	QMenu *reservedRowSubMenu = pdcSubMenu->addMenu(tr("Reserved row"));
+	newModeMenuAction(reservedRowSubMenu, 0x02);
+	newModeMenuAction(reservedRowSubMenu, 0x03);
+	newModeMenuAction(reservedRowSubMenu, 0x05);
+	newModeMenuAction(reservedRowSubMenu, 0x06);
+	newModeMenuAction(reservedRowSubMenu, 0x0e);
+	newModeMenuAction(reservedRowSubMenu, 0x0f);
+	newModeMenuAction(reservedRowSubMenu, 0x14);
+	newModeMenuAction(reservedRowSubMenu, 0x19);
+	newModeMenuAction(reservedRowSubMenu, 0x1a);
+	newModeMenuAction(reservedRowSubMenu, 0x1b);
+	newModeMenuAction(reservedRowSubMenu, 0x1c);
+	newModeMenuAction(reservedRowSubMenu, 0x1d);
+	newModeMenuAction(reservedRowSubMenu, 0x1e);
+	QMenu *reservedColumnSubMenu = pdcSubMenu->addMenu(tr("Reserved column"));
+	newModeMenuAction(reservedColumnSubMenu, 0x24);
+	newModeMenuAction(reservedColumnSubMenu, 0x25);
+	newModeMenuAction(reservedColumnSubMenu, 0x26);
+
+	m_cookedModePushButton->setMenu(m_cookedModeMenu);
 
 	// Raw triplet values
 	QHBoxLayout *rawTripletLayout = new QHBoxLayout;
@@ -161,9 +257,7 @@ X26DockWidget::X26DockWidget(TeletextWidget *parent): QDockWidget(parent)
 	QHBoxLayout *colourAndRowLayout = new QHBoxLayout;
 
 	m_colourComboBox = new QComboBox;
-	for (int c=0; c<=3; c++)
-		for (int e=0; e<=7; e++)
-			m_colourComboBox->addItem(tr("CLUT %1:%2").arg(c).arg(e));
+	m_colourComboBox->setModel(m_parentMainWidget->document()->clutModel());
 	colourAndRowLayout->addWidget(m_colourComboBox);
 	connect(m_colourComboBox, QOverload<int>::of(&QComboBox::activated), this, [=](const int value) { updateModelFromCookedWidget(value, Qt::UserRole+1); } );
 
@@ -181,8 +275,7 @@ X26DockWidget::X26DockWidget(TeletextWidget *parent): QDockWidget(parent)
 	QHBoxLayout *characterCodeLayout = new QHBoxLayout;
 
 	m_characterCodeComboBox = new QComboBox;
-	for (int i=32; i<128; i++)
-		m_characterCodeComboBox->addItem(QString("0x%1").arg(i, 2, 16), i);
+	m_characterCodeComboBox->setModel(&m_characterListModel);
 	characterCodeLayout->addWidget(m_characterCodeComboBox);
 	connect(m_characterCodeComboBox, QOverload<int>::of(&QComboBox::activated), this, [=](const int value) { updateModelFromCookedWidget(value+32, Qt::UserRole+1); } );
 
@@ -240,7 +333,7 @@ X26DockWidget::X26DockWidget(TeletextWidget *parent): QDockWidget(parent)
 	m_objectSourceComboBox->addItem("POP");
 	m_objectSourceComboBox->addItem("GPOP");
 	invokeObjectLayout->addWidget(m_objectSourceComboBox);
-	connect(m_objectSourceComboBox, QOverload<int>::of(&QComboBox::currentIndexChanged), [=](const int value) { updateModelFromCookedWidget(value, Qt::UserRole+1); updateCookedTripletParameters(m_x26View->currentIndex()); } );
+	connect(m_objectSourceComboBox, QOverload<int>::of(&QComboBox::currentIndexChanged), [=](const int value) { updateModelFromCookedWidget(value, Qt::UserRole+1); updateAllCookedTripletWidgets(m_x26View->currentIndex()); } );
 
 	// Object required at which levels
 	m_objectRequiredAtLevelsComboBox = new QComboBox;
@@ -253,13 +346,15 @@ X26DockWidget::X26DockWidget(TeletextWidget *parent): QDockWidget(parent)
 	// Invoke Local Objects
 	QHBoxLayout *invokeLocalObjectLayout = new QHBoxLayout;
 
-	invokeLocalObjectLayout->addWidget(new QLabel(tr("Designation")));
+	m_invokeLocalObjectDesignationCodeLabel = new QLabel(tr("Designation"));
+	invokeLocalObjectLayout->addWidget(m_invokeLocalObjectDesignationCodeLabel);
 	m_invokeLocalObjectDesignationCodeSpinBox = new QSpinBox;
 	m_invokeLocalObjectDesignationCodeSpinBox->setMaximum(15);
 	invokeLocalObjectLayout->addWidget(m_invokeLocalObjectDesignationCodeSpinBox);
 	connect(m_invokeLocalObjectDesignationCodeSpinBox, QOverload<int>::of(&QSpinBox::valueChanged), this, [=](const int value) { updateModelFromCookedWidget(value, Qt::UserRole+2); } );
 
-	invokeLocalObjectLayout->addWidget(new QLabel(tr("Triplet")));
+	m_invokeLocalObjectTripletNumberLabel = new QLabel(tr("Triplet"));
+	invokeLocalObjectLayout->addWidget(m_invokeLocalObjectTripletNumberLabel);
 	m_invokeLocalObjectTripletNumberSpinBox = new QSpinBox;
 	m_invokeLocalObjectTripletNumberSpinBox->setMaximum(12);
 	invokeLocalObjectLayout->addWidget(m_invokeLocalObjectTripletNumberSpinBox);
@@ -546,135 +641,7 @@ void X26DockWidget::updateAllCookedTripletWidgets(const QModelIndex &index)
 {
 	const int modeExt = index.model()->data(index.model()->index(index.row(), 2), Qt::EditRole).toInt();
 
-	// Find which triplettype the triplet is
-	const int oldCookedModeType = m_cookedModeTypeComboBox->currentIndex();
-	switch (modeExt) {
-		case 0x04:
-			m_cookedModeTypeComboBox->setCurrentIndex(0);
-			break;
-		case 0x00:
-		case 0x01:
-		case 0x07:
-		case 0x18:
-			m_cookedModeTypeComboBox->setCurrentIndex(1);
-			break;
-		case 0x20 ... 0x23:
-		case 0x27 ... 0x29:
-		case 0x2b ... 0x3f:
-			m_cookedModeTypeComboBox->setCurrentIndex(2);
-			break;
-		case 0x10 ... 0x13:
-		case 0x15 ... 0x17:
-			m_cookedModeTypeComboBox->setCurrentIndex(3);
-			break;
-		case 0x1f:
-			m_cookedModeTypeComboBox->setCurrentIndex(4);
-			break;
-		default:
-			m_cookedModeTypeComboBox->setCurrentIndex(5);
-	}
-
-	// If the triplettype has changed, update the triplet mode combobox
-	if (oldCookedModeType != m_cookedModeTypeComboBox->currentIndex())
-		updateCookedModeFromCookedType(-1);
-	for (int i=0; i<m_cookedModeComboBox->count(); i++)
-		if (m_cookedModeComboBox->itemData(i) == modeExt) {
-			m_cookedModeComboBox->blockSignals(true);
-			m_cookedModeComboBox->setCurrentIndex(i);
-			m_cookedModeComboBox->blockSignals(false);
-			break;
-		}
-
-	updateCookedTripletParameters(index);
-}
-
-void X26DockWidget::updateCookedModeFromCookedType(const int value)
-{
-	while (m_cookedModeComboBox->count() > 0)
-		m_cookedModeComboBox->removeItem(0);
-	// When called as a slot, "value" parameter would be the same as this currentIndex
-	switch (m_cookedModeTypeComboBox->currentIndex()) {
-		case 1:
-			m_cookedModeComboBox->addItem("select...", -1);
-			m_cookedModeComboBox->addItem("Full screen colour", 0x00);
-			m_cookedModeComboBox->addItem("Full row colour", 0x01);
-			m_cookedModeComboBox->addItem("Address row 0", 0x07);
-			m_cookedModeComboBox->addItem("DRCS mode", 0x18);
-			break;
-		case 2:
-			m_cookedModeComboBox->addItem("select...", -1);
-			m_cookedModeComboBox->addItem("Foreground colour", 0x20);
-			m_cookedModeComboBox->addItem("Background colour", 0x23);
-			m_cookedModeComboBox->addItem("Flash functions", 0x27);
-			m_cookedModeComboBox->addItem("Display attrs", 0x2c);
-			m_cookedModeComboBox->addItem("Font style L 3.5", 0x2e);
-			m_cookedModeComboBox->addItem("Mod G0 and G2", 0x28);
-			m_cookedModeComboBox->addItem("G0 character", 0x29);
-			m_cookedModeComboBox->addItem("G2 character", 0x2f);
-			m_cookedModeComboBox->addItem("G1 block mosaic", 0x21);
-			m_cookedModeComboBox->addItem("G3 at L 1.5", 0x22);
-			m_cookedModeComboBox->addItem("G3 at L 2.5", 0x2b);
-			m_cookedModeComboBox->addItem("DRCS character", 0x2d);
-			for (int i=0; i<16; i++)
-				m_cookedModeComboBox->addItem(QString("G0 diactricial ")+QString("%1").arg(i, 1, 16).toUpper(), 0x30 | i);
-			break;
-		case 3:
-			m_cookedModeComboBox->addItem("select...", -1);
-			m_cookedModeComboBox->addItem("Origin modifier", 0x10);
-			m_cookedModeComboBox->addItem("Invoke active obj", 0x11);
-			m_cookedModeComboBox->addItem("Invoke adaptive obj", 0x12);
-			m_cookedModeComboBox->addItem("Invoke passive obj", 0x13);
-			m_cookedModeComboBox->addItem("Define active obj", 0x15);
-			m_cookedModeComboBox->addItem("Define adaptive obj", 0x16);
-			m_cookedModeComboBox->addItem("Define passive obj", 0x17);
-			break;
-		case 5:
-			m_cookedModeComboBox->addItem("select...", -1);
-			m_cookedModeComboBox->addItem("Origin and Source", 0x08);
-			m_cookedModeComboBox->addItem("Month and day", 0x09);
-			m_cookedModeComboBox->addItem("Row + start hours", 0x0a);
-			m_cookedModeComboBox->addItem("Row + end hours", 0x0b);
-			m_cookedModeComboBox->addItem("Row + time offset", 0x0c);
-			m_cookedModeComboBox->addItem("Series ID and code", 0x0d);
-			m_cookedModeComboBox->addItem("Col + start/end mins", 0x26);
-			m_cookedModeComboBox->addItem("Reserved row 0x02", 0x02);
-			m_cookedModeComboBox->addItem("Reserved row 0x03", 0x03);
-			m_cookedModeComboBox->addItem("Reserved row 0x05", 0x05);
-			m_cookedModeComboBox->addItem("Reserved row 0x06", 0x06);
-			m_cookedModeComboBox->addItem("Reserved row 0x0e", 0x0e);
-			m_cookedModeComboBox->addItem("Reserved row 0x0f", 0x0f);
-			m_cookedModeComboBox->addItem("Reserved row 0x14", 0x14);
-			m_cookedModeComboBox->addItem("Reserved row 0x19", 0x19);
-			m_cookedModeComboBox->addItem("Reserved row 0x1a", 0x1a);
-			m_cookedModeComboBox->addItem("Reserved row 0x1b", 0x1b);
-			m_cookedModeComboBox->addItem("Reserved row 0x1c", 0x1c);
-			m_cookedModeComboBox->addItem("Reserved row 0x1d", 0x1d);
-			m_cookedModeComboBox->addItem("Reserved row 0x1e", 0x1e);
-			m_cookedModeComboBox->addItem("Reserved col 0x04", 0x04);
-			m_cookedModeComboBox->addItem("Reserved col 0x05", 0x05);
-			m_cookedModeComboBox->addItem("Reserved col 0x0a", 0x0a);
-			break;
-		case 0:
-			// When called as a slot the user set the combobox themself, so set the triplet mode immediately
-			if (value != -1) {
-				m_x26Model->setData(m_x26Model->index(m_x26View->currentIndex().row(), 2), 4, Qt::EditRole);
-				updateAllRawTripletSpinBoxes(m_x26View->currentIndex());
-				updateCookedTripletParameters(m_x26View->currentIndex());
-			}
-			break;
-		case 4:
-			if (value != -1) {
-				m_x26Model->setData(m_x26Model->index(m_x26View->currentIndex().row(), 2), 31, Qt::EditRole);
-				updateAllRawTripletSpinBoxes(m_x26View->currentIndex());
-				updateCookedTripletParameters(m_x26View->currentIndex());
-			}
-			break;
-	}
-}
-
-void X26DockWidget::updateCookedTripletParameters(const QModelIndex &index)
-{
-	const int modeExt = index.model()->data(index.model()->index(index.row(), 2), Qt::EditRole).toInt();
+	m_cookedModePushButton->setText(m_x26Model->modeTripletName(modeExt));
 
 	switch (modeExt) {
 		case 0x04: // Set active position
@@ -705,7 +672,16 @@ void X26DockWidget::updateCookedTripletParameters(const QModelIndex &index)
 		case 0x29: // G0 character
 		case 0x2b: // G3 character at Level 2.5
 		case 0x2f ... 0x3f: // G2 character, G0 character with diacritical
+			// TODO non-Latin G0 and G2 character sets
 			m_characterCodeComboBox->blockSignals(true);
+			if (modeExt == 0x22 || modeExt == 0x2b)
+				m_characterListModel.setCharacterSet(26);
+			else if (modeExt == 0x2f)
+				m_characterListModel.setCharacterSet(7);
+			else if (modeExt == 0x21)
+				m_characterListModel.setCharacterSet(24);
+			else
+				m_characterListModel.setCharacterSet(0);
 			m_characterCodeComboBox->setCurrentIndex(index.model()->data(index.model()->index(index.row(), 0), Qt::UserRole+1).toInt()-32);
 			m_characterCodeComboBox->blockSignals(false);
 			m_tripletParameterStackedLayout->setCurrentIndex(2);
@@ -756,14 +732,22 @@ void X26DockWidget::updateCookedTripletParameters(const QModelIndex &index)
 			// BUG we're only dealing with Local Object Definitions at the moment!
 			if (index.model()->data(index.model()->index(index.row(), 0), Qt::UserRole+1).toInt() == 0 || (index.model()->data(index.model()->index(index.row(), 1), Qt::UserRole).toInt() & 0x04)) {
 //			if (triplet.objectSource() == X26Triplet::LocalObjectSource) {
+				const bool tripletLocationWidgetsVisible = (modeExt & 0x04) != 0x04;
+
+				m_invokeLocalObjectDesignationCodeLabel->setVisible(tripletLocationWidgetsVisible);
+				m_invokeLocalObjectDesignationCodeSpinBox->setVisible(tripletLocationWidgetsVisible);
+				m_invokeLocalObjectTripletNumberLabel->setVisible(tripletLocationWidgetsVisible);
+				m_invokeLocalObjectTripletNumberSpinBox->setVisible(tripletLocationWidgetsVisible);
 				m_objectSourceComboBox->setCurrentIndex(0);
 				m_invokeObjectSourceStackedLayout->setCurrentIndex(0);
-				m_invokeLocalObjectDesignationCodeSpinBox->blockSignals(true);
-				m_invokeLocalObjectTripletNumberSpinBox->blockSignals(true);
-				m_invokeLocalObjectDesignationCodeSpinBox->setValue(index.model()->data(index.model()->index(index.row(), 0), Qt::UserRole+2).toInt());
-				m_invokeLocalObjectTripletNumberSpinBox->setValue(index.model()->data(index.model()->index(index.row(), 0), Qt::UserRole+3).toInt());
-				m_invokeLocalObjectDesignationCodeSpinBox->blockSignals(false);
-				m_invokeLocalObjectTripletNumberSpinBox->blockSignals(false);
+				if (tripletLocationWidgetsVisible) {
+					m_invokeLocalObjectDesignationCodeSpinBox->blockSignals(true);
+					m_invokeLocalObjectTripletNumberSpinBox->blockSignals(true);
+					m_invokeLocalObjectDesignationCodeSpinBox->setValue(index.model()->data(index.model()->index(index.row(), 0), Qt::UserRole+2).toInt());
+					m_invokeLocalObjectTripletNumberSpinBox->setValue(index.model()->data(index.model()->index(index.row(), 0), Qt::UserRole+3).toInt());
+					m_invokeLocalObjectDesignationCodeSpinBox->blockSignals(false);
+					m_invokeLocalObjectTripletNumberSpinBox->blockSignals(false);
+				}
 			} else { // if (triplet.objectSource() != X26Triplet::IllegalObjectSource) {
 				m_objectSourceComboBox->setCurrentIndex(index.model()->data(index.model()->index(index.row(), 0), Qt::UserRole+1).toInt());
 				m_invokeObjectSourceStackedLayout->setCurrentIndex(1);
@@ -849,28 +833,36 @@ void X26DockWidget::updateCookedTripletParameters(const QModelIndex &index)
 	// Now deal with cooked row and column spinboxes
 	m_cookedRowSpinBox->blockSignals(true);
 	m_cookedColumnSpinBox->blockSignals(true);
-	QVariant rowVariant = index.model()->data(index.model()->index(index.row(), 0), Qt::EditRole);
+	const QVariant rowVariant = index.model()->data(index.model()->index(index.row(), 0), Qt::EditRole);
 	if (rowVariant.isNull()) {
 		m_cookedRowSpinBox->setEnabled(false);
 		m_cookedRowSpinBox->setValue(0);
+		m_cookedRowSpinBox->setPrefix("");
 	} else {
 		m_cookedRowSpinBox->setEnabled(true);
-		if (index.model()->data(index.model()->index(index.row(), 2), Qt::EditRole) == 0x10)
+		if (modeExt == 0x10) {
 			m_cookedRowSpinBox->setRange(0, 23);
-		else
+			m_cookedRowSpinBox->setPrefix("+");
+		} else {
 			m_cookedRowSpinBox->setRange(1, 24);
+			m_cookedRowSpinBox->setPrefix("");
+		}
 		m_cookedRowSpinBox->setValue(rowVariant.toInt());
 	}
-	QVariant columnVariant = index.model()->data(index.model()->index(index.row(), 1), Qt::EditRole);
+	const QVariant columnVariant = index.model()->data(index.model()->index(index.row(), 1), Qt::EditRole);
 	if (columnVariant.isNull()) {
 		m_cookedColumnSpinBox->setEnabled(false);
 		m_cookedColumnSpinBox->setValue(0);
+		m_cookedColumnSpinBox->setPrefix("");
 	} else {
 		m_cookedColumnSpinBox->setEnabled(true);
-		if (index.model()->data(index.model()->index(index.row(), 2), Qt::EditRole) == 0x10)
+		if (modeExt == 0x10) {
 			m_cookedColumnSpinBox->setMaximum(71);
-		else
+			m_cookedColumnSpinBox->setPrefix("+");
+		} else {
 			m_cookedColumnSpinBox->setMaximum(39);
+			m_cookedColumnSpinBox->setPrefix("");
+		}
 		m_cookedColumnSpinBox->setValue(columnVariant.toInt());
 	}
 	m_cookedRowSpinBox->blockSignals(false);
@@ -945,21 +937,18 @@ void X26DockWidget::cookedColumnSpinBoxChanged(const int value)
 	updateAllRawTripletSpinBoxes(m_x26View->currentIndex());
 }
 
-void X26DockWidget::cookedModeComboBoxChanged(const int value)
+void X26DockWidget::cookedModeMenuSelected(const int value)
 {
 	if (!m_x26View->currentIndex().isValid())
 		return;
 
-	// Avoid "select..."
-	if (m_cookedModeComboBox->itemData(value) == -1)
-		return;
-
-	m_x26Model->setData(m_x26Model->index(m_x26View->currentIndex().row(), 2), m_cookedModeComboBox->itemData(value).toInt(), Qt::EditRole);
+	m_x26Model->setData(m_x26Model->index(m_x26View->currentIndex().row(), 2), value, Qt::EditRole);
 
 	updateAllRawTripletSpinBoxes(m_x26View->currentIndex());
-	updateCookedTripletParameters(m_x26View->currentIndex());
+	updateAllCookedTripletWidgets(m_x26View->currentIndex());
 }
 
+
 void X26DockWidget::updateModelFromCookedWidget(const int value, const int role)
 {
 	m_x26Model->setData(m_x26Model->index(m_x26View->currentIndex().row(), 0), value, role);

x26dockwidget.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -20,10 +20,13 @@
 #ifndef X26DOCKWIDGET_H
 #define X26DOCKWIDGET_H
 
+#include <QAbstractListModel>
 #include <QCheckBox>
 #include <QComboBox>
 #include <QDockWidget>
 #include <QGroupBox>
+#include <QLabel>
+#include <QMenu>
 #include <QPushButton>
 #include <QRadioButton>
 #include <QSpinBox>
@@ -31,8 +34,25 @@
 #include <QTableView>
 
 #include "mainwidget.h"
+#include "render.h"
 #include "x26model.h"
 
+class CharacterListModel : public QAbstractListModel
+{
+	Q_OBJECT
+
+public:
+	CharacterListModel(QObject *parent = 0);
+
+	int rowCount(const QModelIndex &parent = QModelIndex()) const override;
+	QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
+	void setCharacterSet(int);
+
+private:
+	TeletextFontBitmap m_fontBitmap;
+	int m_characterSet;
+};
+
 class X26DockWidget : public QDockWidget
 {
 	Q_OBJECT
@@ -50,26 +70,25 @@ public slots:
 	void updateAllRawTripletSpinBoxes(const QModelIndex &);
 	void updateRawTripletDataSpinBox(const QModelIndex &);
 	void updateAllCookedTripletWidgets(const QModelIndex &);
-	void updateCookedModeFromCookedType(const int);
-	void updateCookedTripletParameters(const QModelIndex &);
 	void rawTripletAddressSpinBoxChanged(int);
 	void rawTripletModeSpinBoxChanged(int);
 	void rawTripletDataSpinBoxChanged(int);
 	void cookedRowSpinBoxChanged(const int);
 	void cookedColumnSpinBoxChanged(const int);
-	void cookedModeComboBoxChanged(const int);
+	void cookedModeMenuSelected(const int);
 	void updateModelFromCookedWidget(const int, const int);
 	void selectX26ListRow(int);
 
 protected:
 	void keyPressEvent(QKeyEvent *event) override;
+	CharacterListModel m_characterListModel;
 
 private:
 	QTableView *m_x26View;
 	X26Model *m_x26Model;
-	QComboBox *m_cookedModeTypeComboBox;
 	QSpinBox *m_cookedRowSpinBox, *m_cookedColumnSpinBox;
-	QComboBox *m_cookedModeComboBox;
+	QMenu *m_cookedModeMenu;
+	QPushButton *m_cookedModePushButton;
 	QSpinBox *m_rawTripletAddressSpinBox, *m_rawTripletModeSpinBox, *m_rawTripletDataSpinBox;
 	QStackedLayout *m_rawOrCookedStackedLayout;
 	QComboBox *m_colourComboBox;
@@ -79,6 +98,7 @@ private:
 	QComboBox *m_textSizeComboBox;
 	QCheckBox *m_displayAttributeBoxingCheckBox, *m_displayAttributeConcealCheckBox, *m_displayAttributeInvertCheckBox, *m_displayAttributeUnderlineCheckBox;
 	QComboBox *m_objectSourceComboBox, *m_objectRequiredAtLevelsComboBox;
+	QLabel *m_invokeLocalObjectDesignationCodeLabel, *m_invokeLocalObjectTripletNumberLabel;
 	QSpinBox *m_invokeLocalObjectDesignationCodeSpinBox, *m_invokeLocalObjectTripletNumberSpinBox;
 	QSpinBox *m_invokePOPSubPageSpinBox, *m_invokePOPPacketNumberSpinBox;
 	QComboBox *m_invokePOPTripletNumberComboBox, *m_invokePOPPointerBitsComboBox;

x26model.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -22,6 +22,7 @@
 
 #include <QAbstractListModel>
 #include "mainwidget.h"
+#include "render.h"
 
 class X26Model : public QAbstractListModel
 {
@@ -40,6 +41,8 @@ public:
 	bool removeRows(int position, int rows, const QModelIndex &index);
 //	Qt::ItemFlags flags(const QModelIndex &index) const;
 
+	const QString modeTripletName(int i) const { return m_modeTripletName[i]; }
+
 	// The x26commands classes manipulate the model but beginInsertRows and endInsertRows
 	// are protected methods, so we need to friend them
 	friend class InsertTripletCommand;
@@ -49,87 +52,99 @@ public:
 private:
 	TeletextWidget *m_parentMainWidget;
 	bool m_listLoaded;
-};
+	TeletextFontBitmap m_fontBitmap;
 
-static const QString modeTripletName[64] {
-	// Row triplet modes
-	"Full screen colour",
-	"Full row colour",
-	"Reserved 0x02",
-	"Reserved 0x03",
+	const QString m_modeTripletName[64] {
+		// Row triplet modes
+		"Full screen colour",
+		"Full row colour",
+		"Reserved 0x02",
+		"Reserved 0x03",
 
-	"Set Active Position",
-	"Reserved 0x05",
-	"Reserved 0x06",
-	"Address row 0",
+		"Set Active Position",
+		"Reserved 0x05",
+		"Reserved 0x06",
+		"Address row 0",
 
-	"PDC origin, source",
-	"PDC month and day",
-	"PDC cursor and start hour",
-	"PDC cursor and end hour",
+		"PDC origin, source",
+		"PDC month and day",
+		"PDC cursor and start hour",
+		"PDC cursor and end hour",
 
-	"PDC cursor local offset",
-	"PDC series ID and code",
-	"Reserved 0x0e",
-	"Reserved 0x0f",
+		"PDC cursor local offset",
+		"PDC series ID and code",
+		"Reserved 0x0e",
+		"Reserved 0x0f",
 
-	"Origin modifier",
-	"Invoke active object",
-	"Invoke adaptive object",
-	"Invoke passive object",
+		"Origin modifier",
+		"Invoke active object",
+		"Invoke adaptive object",
+		"Invoke passive object",
 
-	"Reserved 0x14",
-	"Define active object",
-	"Define adaptive object",
-	"Define passive object",
+		"Reserved 0x14",
+		"Define active object",
+		"Define adaptive object",
+		"Define passive object",
 
-	"DRCS mode",
-	"Reserved 0x19",
-	"Reserved 0x1a",
-	"Reserved 0x1b",
+		"DRCS mode",
+		"Reserved 0x19",
+		"Reserved 0x1a",
+		"Reserved 0x1b",
 
-	"Reserved 0x1c",
-	"Reserved 0x1d",
-	"Reserved 0x1e",
-	"Termination marker",
+		"Reserved 0x1c",
+		"Reserved 0x1d",
+		"Reserved 0x1e",
+		"Termination marker",
 
-	// Column triplet modes
-	"Foreground colour",
-	"G1 character",
-	"G3 character, level 1.5",
-	"Background colour",
+		// Column triplet modes
+		"Foreground colour",
+		"G1 block mosaic",
+		"G3 smooth mosaic, level 1.5",
+		"Background colour",
 
-	"Reserved 0x04",
-	"Reserved 0x05",
-	"PDC cursor, start end min",
-	"Additional flash functions",
+		"Reserved 0x04",
+		"Reserved 0x05",
+		"PDC cursor, start end min",
+		"Additional flash functions",
 
-	"Modified G0/G2 character set",
-	"G0 character",
-	"Reserved 0x0a",
-	"G3 character, level 2.5",
+		"Modified G0/G2 character set",
+		"G0 character",
+		"Reserved 0x0a",
+		"G3 smooth mosaic, level 2.5",
 
-	"Display attributes",
-	"DRCS character",
-	"Font style",
-	"G2 character",
+		"Display attributes",
+		"DRCS character",
+		"Font style, level 3.5",
+		"G2 supplementary character",
 
-	"G0 character no diacritical",
-	"G0 character diacritical 1",
-	"G0 character diacritical 2",
-	"G0 character diacritical 3",
-	"G0 character diacritical 4",
-	"G0 character diacritical 5",
-	"G0 character diacritical 6",
-	"G0 character diacritical 7",
-	"G0 character diacritical 8",
-	"G0 character diacritical 9",
-	"G0 character diacritical A",
-	"G0 character diacritical B",
-	"G0 character diacritical C",
-	"G0 character diacritical D",
-	"G0 character diacritical E",
-	"G0 character diacritical F"
+		"G0 character no diacritical",
+		"G0 character diacritical 1",
+		"G0 character diacritical 2",
+		"G0 character diacritical 3",
+		"G0 character diacritical 4",
+		"G0 character diacritical 5",
+		"G0 character diacritical 6",
+		"G0 character diacritical 7",
+		"G0 character diacritical 8",
+		"G0 character diacritical 9",
+		"G0 character diacritical A",
+		"G0 character diacritical B",
+		"G0 character diacritical C",
+		"G0 character diacritical D",
+		"G0 character diacritical E",
+		"G0 character diacritical F"
+	};
+
+	struct tripletErrorShow {
+		QString message;
+		int columnHighlight;
+	};
+
+	const tripletErrorShow m_tripletErrors[3] {
+		{ "", 0 }, // No error
+		{ "Active Position can't move up", 0 },
+		{ "Active Position can't move left within row", 1 }
+	};
 };
 
 #endif

x26triplets.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -50,3 +50,140 @@ void X26Triplet::setAddressColumn(int addressColumn)
 {
 	m_address = addressColumn;
 }
+
+void X26Triplet::setObjectLocalDesignationCode(int i)
+{
+	m_address = (m_address & 0x38) | (i >> 3);
+	m_data = (m_data & 0x0f) | ((i & 0x07) << 4);
+}
+
+void X26Triplet::setObjectLocalTripletNumber(int i)
+{
+	m_data = (m_data & 0x70) | i;
+}
+
+void X26Triplet::setObjectLocalIndex(int i)
+{
+	m_address = (m_address & 0x38) + (i >= 104); // Set bit 0 of address if triplet >= 8
+	m_data = (((i / 13) & 0x07) << 4) | (i % 13);
+}
+
+
+void X26TripletList::updateInternalData(int r)
+{
+	ActivePosition activePosition;
+	X26Triplet *triplet;
+
+	if (r != 0) {
+		activePosition.setRow(m_list[r-1].m_activePositionRow);
+		activePosition.setColumn(m_list[r-1].m_activePositionColumn);
+	}
+
+	for (int i=r; i < m_list.size(); i++) {
+		triplet = &m_list[i];
+		triplet->m_error = X26Triplet::NoError;
+		if (triplet->isRowTriplet()) {
+			switch (m_list.at(i).modeExt()) {
+				case 0x00: // Full screen colour
+					if (activePosition.isDeployed())
+						// TODO more specific error needed
+						triplet->m_error = X26Triplet::ActivePositionMovedUp;
+					break;
+				case 0x01: // Full row colour
+					if (!activePosition.setRow(triplet->addressRow()))
+						triplet->m_error = X26Triplet::ActivePositionMovedUp;
+					break;
+				case 0x04: // Set Active Position;
+					if (!activePosition.setRow(triplet->addressRow()))
+						triplet->m_error = X26Triplet::ActivePositionMovedUp;
+					else if (triplet->data() >= 40 || !activePosition.setColumn(triplet->data()))
+						triplet->m_error = X26Triplet::ActivePositionMovedLeft;
+					break;
+				case 0x07: // Address row 0
+					if (activePosition.isDeployed())
+						triplet->m_error = X26Triplet::ActivePositionMovedUp;
+					else {
+						activePosition.setRow(0);
+						activePosition.setColumn(8);
+					}
+					break;
+				case 0x15 ... 0x17: // Define Object
+					activePosition.reset();
+					// Make sure data field holds correct place of triplet
+					// otherwise the object won't appear
+					triplet->setObjectLocalIndex(i);
+					break;
+			};
+		// Column triplet: make sure that PDC and reserved triplets don't affect the Active Position
+		} else if (triplet->modeExt() != 0x24 && triplet->modeExt() != 0x25 && triplet->modeExt() != 0x26 && triplet->modeExt() != 0x2a)
+			if (!activePosition.setColumn(triplet->addressColumn()))
+				triplet->m_error = X26Triplet::ActivePositionMovedLeft;
+		triplet->m_activePositionRow = activePosition.row();
+		triplet->m_activePositionColumn = activePosition.column();
+	}
+}
+
+void X26TripletList::append(const X26Triplet &value)
+{
+	m_list.append(value);
+	updateInternalData(m_list.size()-1);
+}
+
+void X26TripletList::insert(int i, const X26Triplet &value)
+{
+	m_list.insert(i, value);
+	updateInternalData(i);
+}
+
+void X26TripletList::removeAt(int i)
+{
+	m_list.removeAt(i);
+	if (m_list.size() != 0 && i < m_list.size())
+		updateInternalData(i);
+}
+
+void X26TripletList::replace(int i, const X26Triplet &value)
+{
+	m_list.replace(i, value);
+	updateInternalData(i);
+}
+
+
+X26TripletList::ActivePosition::ActivePosition()
+{
+	m_row = m_column = -1;
+}
+
+void X26TripletList::ActivePosition::reset()
+{
+	m_row = m_column = -1;
+}
+
+bool X26TripletList::ActivePosition::setRow(int row)
+{
+	if (row < m_row)
+		return false;
+	if (row > m_row) {
+		m_row = row;
+		m_column = -1;
+	}
+	return true;
+}
+
+bool X26TripletList::ActivePosition::setColumn(int column)
+{
+	if (column < m_column)
+		return false;
+	if (m_row == -1 and column >= 0)
+		m_row = 0;
+	m_column = column;
+	return true;
+}
+/*
+bool X26TripletList::ActivePosition::setRowAndColumn(int newRow, int newColumn)
+{
+	if (!setRow(newRow))
+		return false;
+	return setColumn(newColumn);
+}
+*/

x26triplets.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020, 2021 Gavin MacGregor
+ * Copyright (C) 2020-2022 Gavin MacGregor
  *
  * This file is part of QTeletextMaker.
  *
@@ -20,9 +20,13 @@
 #ifndef X26TRIPLETS_H
 #define X26TRIPLETS_H
 
+#include <QList>
+
 class X26Triplet
 {
 public:
+	enum X26TripletError { NoError, ActivePositionMovedUp, ActivePositionMovedLeft };
+
 	X26Triplet() {}
 //	X26Triplet(const X26Triplet &other);
 
@@ -44,9 +48,63 @@ public:
 	void setAddressRow(int);
 	void setAddressColumn(int);
 
+	int objectLocalDesignationCode() const { return (((m_address & 0x01) << 3) | (m_data >> 4)); }
+	int objectLocalTripletNumber() const { return m_data & 0x0f; }
+	int objectLocalIndex() const { return objectLocalDesignationCode() * 13 + objectLocalTripletNumber(); }
+	void setObjectLocalDesignationCode(int);
+	void setObjectLocalTripletNumber(int);
+	void setObjectLocalIndex(int);
+
+	int activePositionRow() const { return m_activePositionRow; }
+	int activePositionColumn() const { return m_activePositionColumn; }
+	X26TripletError error() const { return m_error; }
+
+	friend class X26TripletList;
+
 private:
 	int m_address, m_mode, m_data;
+	int m_activePositionRow = -1;
+	int m_activePositionColumn = -1;
+	X26TripletError m_error = NoError;
+};
 
+class X26TripletList
+{
+public:
+	void append(const X26Triplet &);
+	void insert(int, const X26Triplet &);
+	void removeAt(int);
+	void replace(int, const X26Triplet &);
+
+	void removeLast() { m_list.removeLast(); }
+
+	const X26Triplet &at(int i) const { return m_list.at(i); }
+	bool isEmpty() const { return m_list.isEmpty(); }
+	void reserve(int alloc) { m_list.reserve(alloc); }
+	int size() const { return m_list.size(); }
+
+private:
+	void updateInternalData(int);
+
+	QList<X26Triplet> m_list;
+
+	class ActivePosition
+	{
+	public:
+		ActivePosition();
+		void reset();
+//		int row() const { return (m_row == -1) ? 0 : m_row; }
+//		int column() const { return (m_column == -1) ? 0 : m_column; }
+		int row() const { return m_row; }
+		int column() const { return m_column; }
+		bool isDeployed() const { return m_row != -1; }
+		bool setRow(int);
+		bool setColumn(int);
+//		bool setRowAndColumn(int, int);
+
+	private:
+		int m_row, m_column;
+	};
 };
 
 #endif