Implement insert and overwrite editing modes

levelonecommands.cpp

@@ -21,26 +21,36 @@
 
 #include "document.h"
 
-OverwriteCharacterCommand::OverwriteCharacterCommand(TeletextDocument *teletextDocument, unsigned char newCharacter, QUndoCommand *parent) : QUndoCommand(parent)
+TypeCharacterCommand::TypeCharacterCommand(TeletextDocument *teletextDocument, unsigned char newCharacter, bool insertMode, QUndoCommand *parent) : QUndoCommand(parent)
 {
 	m_teletextDocument = teletextDocument;
 	m_subPageIndex = teletextDocument->currentSubPageIndex();
 	m_row = teletextDocument->cursorRow();
 	m_columnStart = m_columnEnd = teletextDocument->cursorColumn();
+	m_newCharacter = newCharacter;
+	m_insertMode = insertMode;
+
 	for (int c=0; c<40; c++)
 		m_oldRowContents[c] = m_newRowContents[c] = m_teletextDocument->currentSubPage()->character(m_row, c);
-	m_newCharacter = newCharacter;
 
-	setText(QObject::tr("overwrite char"));
+	if (m_insertMode)
+		setText(QObject::tr("insert character"));
+	else
+		setText(QObject::tr("overwrite character"));
 	m_firstDo = true;
 }
 
-void OverwriteCharacterCommand::redo()
+void TypeCharacterCommand::redo()
 {
 	m_teletextDocument->selectSubPageIndex(m_subPageIndex);
 
 	// Only apply the typed character on the first do, m_newRowContents will remember it if we redo
 	if (m_firstDo) {
+		if (m_insertMode) {
+			// Insert - Move characters rightwards
+			for (int c=39; c>m_columnEnd; c--)
+				m_newRowContents[c] = m_newRowContents[c-1];
+		}
 		m_newRowContents[m_columnEnd] = m_newCharacter;
 		m_firstDo = false;
 	}
@@ -52,7 +62,7 @@ void OverwriteCharacterCommand::redo()
 	emit m_teletextDocument->contentsChange(m_row);
 }
 
-void OverwriteCharacterCommand::undo()
+void TypeCharacterCommand::undo()
 {
 	m_teletextDocument->selectSubPageIndex(m_subPageIndex);
 
@@ -63,9 +73,9 @@ void OverwriteCharacterCommand::undo()
 	emit m_teletextDocument->contentsChange(m_row);
 }
 
-bool OverwriteCharacterCommand::mergeWith(const QUndoCommand *command)
+bool TypeCharacterCommand::mergeWith(const QUndoCommand *command)
 {
-	const OverwriteCharacterCommand *newerCommand = static_cast<const OverwriteCharacterCommand *>(command);
+	const TypeCharacterCommand *newerCommand = static_cast<const TypeCharacterCommand *>(command);
 
 	// Has to be the next typed column on the same row
 	if (m_subPageIndex != newerCommand->m_subPageIndex || m_row != newerCommand->m_row || m_columnEnd != newerCommand->m_columnEnd-1)
@@ -90,14 +100,17 @@ ToggleMosaicBitCommand::ToggleMosaicBitCommand(TeletextDocument *teletextDocumen
 		m_newCharacter = bitToToggle;
 	else
 		m_newCharacter = m_oldCharacter ^ bitToToggle;
+
+	setText(QObject::tr("mosaic"));
+
 }
 
 void ToggleMosaicBitCommand::redo()
 {
 	m_teletextDocument->selectSubPageIndex(m_subPageIndex);
 	m_teletextDocument->currentSubPage()->setCharacter(m_row, m_column, m_newCharacter);
+
 	m_teletextDocument->moveCursor(m_row, m_column);
-	setText(QObject::tr("mosaic"));
 	emit m_teletextDocument->contentsChange(m_row);
 }
 
@@ -105,8 +118,8 @@ void ToggleMosaicBitCommand::undo()
 {
 	m_teletextDocument->selectSubPageIndex(m_subPageIndex);
 	m_teletextDocument->currentSubPage()->setCharacter(m_row, m_column, m_oldCharacter);
+
 	m_teletextDocument->moveCursor(m_row, m_column);
-	setText(QObject::tr("mosaic"));
 	emit m_teletextDocument->contentsChange(m_row);
 }
 
@@ -121,7 +134,7 @@ bool ToggleMosaicBitCommand::mergeWith(const QUndoCommand *command)
 }
 
 
-BackspaceCommand::BackspaceCommand(TeletextDocument *teletextDocument, QUndoCommand *parent) : QUndoCommand(parent)
+BackspaceKeyCommand::BackspaceKeyCommand(TeletextDocument *teletextDocument, bool insertMode, QUndoCommand *parent) : QUndoCommand(parent)
 {
 	m_teletextDocument = teletextDocument;
 	m_subPageIndex = teletextDocument->currentSubPageIndex();
@@ -133,6 +146,8 @@ BackspaceCommand::BackspaceCommand(TeletextDocument *teletextDocument, QUndoComm
 			m_row = 24;
 	}
 	m_columnEnd = m_columnStart;
+	m_insertMode = insertMode;
+
 	for (int c=0; c<40; c++)
 		m_oldRowContents[c] = m_newRowContents[c] = m_teletextDocument->currentSubPage()->character(m_row, c);
 
@@ -140,14 +155,22 @@ BackspaceCommand::BackspaceCommand(TeletextDocument *teletextDocument, QUndoComm
 	m_firstDo = true;
 }
 
-void BackspaceCommand::redo()
+void BackspaceKeyCommand::redo()
 {
 	m_teletextDocument->selectSubPageIndex(m_subPageIndex);
 
 	if (m_firstDo) {
+		if (m_insertMode) {
+			// Insert - Move characters leftwards and put a space on the far right
+			for (int c=m_columnEnd; c<39; c++)
+				m_newRowContents[c] = m_newRowContents[c+1];
+			m_newRowContents[39] = 0x20;
+		} else
+			// Replace - Overwrite backspaced character with a space
 			m_newRowContents[m_columnEnd] = 0x20;
 		m_firstDo = false;
 	}
+
 	for (int c=0; c<40; c++)
 		m_teletextDocument->currentSubPage()->setCharacter(m_row, c, m_newRowContents[c]);
 
@@ -155,7 +178,7 @@ void BackspaceCommand::redo()
 	emit m_teletextDocument->contentsChange(m_row);
 }
 
-void BackspaceCommand::undo()
+void BackspaceKeyCommand::undo()
 {
 	m_teletextDocument->selectSubPageIndex(m_subPageIndex);
 
@@ -167,9 +190,9 @@ void BackspaceCommand::undo()
 	emit m_teletextDocument->contentsChange(m_row);
 }
 
-bool BackspaceCommand::mergeWith(const QUndoCommand *command)
+bool BackspaceKeyCommand::mergeWith(const QUndoCommand *command)
 {
-	const BackspaceCommand *newerCommand = static_cast<const BackspaceCommand *>(command);
+	const BackspaceKeyCommand *newerCommand = static_cast<const BackspaceKeyCommand *>(command);
 
 	// Has to be the next backspaced column on the same row
 	if (m_subPageIndex != newerCommand->m_subPageIndex || m_row != newerCommand->m_row || m_columnEnd != newerCommand->m_columnEnd+1)
@@ -191,6 +214,7 @@ DeleteKeyCommand::DeleteKeyCommand(TeletextDocument *teletextDocument, QUndoComm
 	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);
 
@@ -201,6 +225,7 @@ void DeleteKeyCommand::redo()
 {
 	m_teletextDocument->selectSubPageIndex(m_subPageIndex);
 
+	// Move characters leftwards and put a space on the far right
 	for (int c=m_column; c<39; c++)
 		m_newRowContents[c] = m_newRowContents[c+1];
 	m_newRowContents[39] = 0x20;
@@ -243,6 +268,11 @@ InsertRowCommand::InsertRowCommand(TeletextDocument *teletextDocument, bool copy
 	m_subPageIndex = teletextDocument->currentSubPageIndex();
 	m_row = teletextDocument->cursorRow();
 	m_copyRow = copyRow;
+
+	if (m_copyRow)
+		setText(QObject::tr("insert copy row"));
+	else
+		setText(QObject::tr("insert blank row"));
 }
 
 void InsertRowCommand::redo()
@@ -252,18 +282,15 @@ void InsertRowCommand::redo()
 	// Store copy of the bottom row we're about to push out, for undo
 	for (int c=0; c<40; c++)
 		m_deletedBottomRow[c] = m_teletextDocument->currentSubPage()->character(23, c);
-	// Shuffle lines below the inserting row downwards without affecting the FastText row
+	// Move lines below the inserting row downwards without affecting the FastText row
 	for (int r=22; r>=m_row; r--)
 		for (int c=0; c<40; c++)
 			m_teletextDocument->currentSubPage()->setCharacter(r+1, c, m_teletextDocument->currentSubPage()->character(r, c));
-	if (m_copyRow)
-		setText(QObject::tr("insert copy row"));
-	else {
-		// The above shuffle leaves a duplicate of the current row, so blank it if requested
+	if (!m_copyRow)
+		// The above movement leaves a duplicate of the current row, so blank it if requested
 		for (int c=0; c<40; c++)
 			m_teletextDocument->currentSubPage()->setCharacter(m_row, c, ' ');
-		setText(QObject::tr("insert blank row"));
-	}
+
 	emit m_teletextDocument->refreshNeeded();
 }
 
@@ -271,17 +298,14 @@ void InsertRowCommand::undo()
 {
 	m_teletextDocument->selectSubPageIndex(m_subPageIndex);
 	m_teletextDocument->moveCursor(m_row, -1);
-	// Shuffle lines below the deleting row upwards without affecting the FastText row
+	// Move lines below the deleting row upwards without affecting the FastText row
 	for (int r=m_row; r<23; r++)
 		for (int c=0; c<40; c++)
 			m_teletextDocument->currentSubPage()->setCharacter(r, c, m_teletextDocument->currentSubPage()->character(r+1, c));
 	// Now repair the bottom row we pushed out
 	for (int c=0; c<40; c++)
 		m_teletextDocument->currentSubPage()->setCharacter(23, c, m_deletedBottomRow[c]);
-	if (m_copyRow)
-		setText(QObject::tr("insert copy row"));
-	else
-		setText(QObject::tr("insert blank row"));
+
 	emit m_teletextDocument->refreshNeeded();
 }
 
@@ -291,6 +315,8 @@ DeleteRowCommand::DeleteRowCommand(TeletextDocument *teletextDocument, QUndoComm
 	m_teletextDocument = teletextDocument;
 	m_subPageIndex = teletextDocument->currentSubPageIndex();
 	m_row = teletextDocument->cursorRow();
+
+	setText(QObject::tr("delete row"));
 }
 
 void DeleteRowCommand::redo()
@@ -300,7 +326,7 @@ void DeleteRowCommand::redo()
 	// Store copy of the row we're going to delete, for undo
 	for (int c=0; c<40; c++)
 		m_deletedRow[c] = m_teletextDocument->currentSubPage()->character(m_row, c);
-	// Shuffle lines below the deleting row upwards without affecting the FastText row
+	// Move lines below the deleting row upwards without affecting the FastText row
 	for (int r=m_row; r<23; r++)
 		for (int c=0; c<40; c++)
 			m_teletextDocument->currentSubPage()->setCharacter(r, c, m_teletextDocument->currentSubPage()->character(r+1, c));
@@ -308,7 +334,7 @@ void DeleteRowCommand::redo()
 	int blankingRow = (m_row < 24) ? 23 : 24;
 		for (int c=0; c<40; c++)
 			m_teletextDocument->currentSubPage()->setCharacter(blankingRow, c, ' ');
-	setText(QObject::tr("delete row"));
+
 	emit m_teletextDocument->refreshNeeded();
 }
 
@@ -316,14 +342,14 @@ void DeleteRowCommand::undo()
 {
 	m_teletextDocument->selectSubPageIndex(m_subPageIndex);
 	m_teletextDocument->moveCursor(m_row, -1);
-	// Shuffle lines below the inserting row downwards without affecting the FastText row
+	// Move lines below the inserting row downwards without affecting the FastText row
 	for (int r=22; r>=m_row; r--)
 		for (int c=0; c<40; c++)
 			m_teletextDocument->currentSubPage()->setCharacter(r+1, c, m_teletextDocument->currentSubPage()->character(r, c));
 	// Now repair the row we deleted
 	for (int c=0; c<40; c++)
 		m_teletextDocument->currentSubPage()->setCharacter(m_row, c, m_deletedRow[c]);
-	setText(QObject::tr("delete row"));
+
 	emit m_teletextDocument->refreshNeeded();
 }
 
@@ -333,21 +359,24 @@ InsertSubPageCommand::InsertSubPageCommand(TeletextDocument *teletextDocument, b
 	m_teletextDocument = teletextDocument;
 	m_newSubPageIndex = teletextDocument->currentSubPageIndex()+afterCurrentSubPage;
 	m_copySubPage = copySubPage;
+
+	setText(QObject::tr("insert subpage"));
+
 }
 
 void InsertSubPageCommand::redo()
 {
 	m_teletextDocument->insertSubPage(m_newSubPageIndex, m_copySubPage);
+
 	m_teletextDocument->selectSubPageIndex(m_newSubPageIndex, true);
-	setText(QObject::tr("insert subpage"));
 }
 
 void InsertSubPageCommand::undo()
 {
 	m_teletextDocument->deleteSubPage(m_newSubPageIndex);
 	//TODO should we always wrench to "subpage viewed when we inserted"? Or just if subpage viewed is being deleted?
+
 	m_teletextDocument->selectSubPageIndex(qMin(m_newSubPageIndex, m_teletextDocument->numberOfSubPages()-1), true);
-	setText(QObject::tr("insert subpage"));
 }
 
 
@@ -378,14 +407,17 @@ SetColourCommand::SetColourCommand(TeletextDocument *teletextDocument, int colou
 	m_colourIndex = colourIndex;
 	m_oldColour = teletextDocument->currentSubPage()->CLUT(colourIndex);
 	m_newColour = newColour;
+
+	setText(QObject::tr("colour change"));
+
 }
 
 void SetColourCommand::redo()
 {
 	m_teletextDocument->selectSubPageIndex(m_subPageIndex);
 	m_teletextDocument->currentSubPage()->setCLUT(m_colourIndex, m_newColour);
+
 	emit m_teletextDocument->colourChanged(m_colourIndex);
-	setText(QObject::tr("colour change"));
 	emit m_teletextDocument->refreshNeeded();
 }
 
@@ -393,8 +425,8 @@ void SetColourCommand::undo()
 {
 	m_teletextDocument->selectSubPageIndex(m_subPageIndex);
 	m_teletextDocument->currentSubPage()->setCLUT(m_colourIndex, m_oldColour);
+
 	emit m_teletextDocument->colourChanged(m_colourIndex);
-	setText(QObject::tr("colour change"));
 	emit m_teletextDocument->refreshNeeded();
 }
 
@@ -406,6 +438,8 @@ ResetCLUTCommand::ResetCLUTCommand(TeletextDocument *teletextDocument, int colou
 	m_colourTable = colourTable;
 	for (int i=m_colourTable*8; i<m_colourTable*8+8; i++)
 		m_oldColourEntry[i&7] = teletextDocument->currentSubPage()->CLUT(i);
+
+	setText(QObject::tr("CLUT %1 reset").arg(m_colourTable));
 }
 
 void ResetCLUTCommand::redo()
@@ -415,7 +449,7 @@ void ResetCLUTCommand::redo()
 		m_teletextDocument->currentSubPage()->setCLUT(i, m_teletextDocument->currentSubPage()->CLUT(i, 0));
 		emit m_teletextDocument->colourChanged(i);
 	}
-	setText(QObject::tr("CLUT %1 reset").arg(m_colourTable));
+
 	emit m_teletextDocument->refreshNeeded();
 }
 
@@ -426,6 +460,6 @@ void ResetCLUTCommand::undo()
 		m_teletextDocument->currentSubPage()->setCLUT(i, m_oldColourEntry[i&7]);
 		emit m_teletextDocument->colourChanged(i);
 	}
-	setText(QObject::tr("CLUT %1 reset").arg(m_colourTable));
+
 	emit m_teletextDocument->refreshNeeded();
 }

levelonecommands.h

@@ -24,12 +24,12 @@
 
 #include "document.h"
 
-class OverwriteCharacterCommand : public QUndoCommand
+class TypeCharacterCommand : public QUndoCommand
 {
 public:
 	enum { Id = 101 };
 
-	OverwriteCharacterCommand(TeletextDocument *, unsigned char, QUndoCommand *parent = 0);
+	TypeCharacterCommand(TeletextDocument *, unsigned char, bool, QUndoCommand *parent = 0);
 
 	void redo() override;
 	void undo() override;
@@ -40,7 +40,7 @@ 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;
+	bool m_firstDo, m_insertMode;
 };
 
 class ToggleMosaicBitCommand : public QUndoCommand
@@ -61,12 +61,12 @@ private:
 	int m_subPageIndex, m_row, m_column;
 };
 
-class BackspaceCommand : public QUndoCommand
+class BackspaceKeyCommand : public QUndoCommand
 {
 public:
 	enum { Id = 103 };
 
-	BackspaceCommand(TeletextDocument *, QUndoCommand *parent = 0);
+	BackspaceKeyCommand(TeletextDocument *, bool insertMode, QUndoCommand *parent = 0);
 
 	void redo() override;
 	void undo() override;
@@ -77,7 +77,7 @@ private:
 	TeletextDocument *m_teletextDocument;
 	unsigned char m_oldRowContents[40], m_newRowContents[40];
 	int m_subPageIndex, m_row, m_columnStart, m_columnEnd;
-	bool m_firstDo;
+	bool m_firstDo, m_insertMode;
 };
 
 class DeleteKeyCommand : public QUndoCommand

mainwidget.cpp

@@ -144,6 +144,11 @@ void TeletextWidget::timerEvent(QTimerEvent *event)
 		QWidget::timerEvent(event);
 }
 
+void TeletextWidget::setInsertMode(bool insertMode)
+{
+	m_insertMode = insertMode;
+}
+
 void TeletextWidget::toggleReveal(bool revealOn)
 {
 	m_pageRender.setReveal(revealOn);
@@ -330,7 +335,10 @@ void TeletextWidget::keyPressEvent(QKeyEvent *event)
 	}
 	switch (event->key()) {
 		case Qt::Key_Backspace:
-			backspaceEvent();
+			m_teletextDocument->undoStack()->push(new BackspaceKeyCommand(m_teletextDocument, m_insertMode));
+			break;
+		case Qt::Key_Tab:
+			m_teletextDocument->undoStack()->push(new TypeCharacterCommand(m_teletextDocument, 0x20, true));
 			break;
 		case Qt::Key_Delete:
 			m_teletextDocument->undoStack()->push(new DeleteKeyCommand(m_teletextDocument));
@@ -383,8 +391,7 @@ void TeletextWidget::keyPressEvent(QKeyEvent *event)
 
 void TeletextWidget::setCharacter(unsigned char newCharacter)
 {
-	QUndoCommand *overwriteCharacterCommand = new OverwriteCharacterCommand(m_teletextDocument, newCharacter);
-	m_teletextDocument->undoStack()->push(overwriteCharacterCommand);
+	m_teletextDocument->undoStack()->push(new TypeCharacterCommand(m_teletextDocument, newCharacter, m_insertMode));
 }
 
 void TeletextWidget::toggleCharacterBit(unsigned char bitToToggle)
@@ -393,12 +400,6 @@ void TeletextWidget::toggleCharacterBit(unsigned char bitToToggle)
 	m_teletextDocument->undoStack()->push(toggleMosaicBitCommand);
 }
 
-void TeletextWidget::backspaceEvent()
-{
-	QUndoCommand *backspaceCommand = new BackspaceCommand(m_teletextDocument);
-	m_teletextDocument->undoStack()->push(backspaceCommand);
-}
-
 QPair<int, int> TeletextWidget::mouseToRowAndColumn(const QPoint &mousePosition)
 {
 	int row = mousePosition.y() / 10;

mainwidget.h

@@ -43,7 +43,8 @@ public:
 	~TeletextWidget();
 	void setCharacter(unsigned char);
 	void toggleCharacterBit(unsigned char);
-	void backspaceEvent();
+	bool insertMode() const { return m_insertMode; };
+	void setInsertMode(bool);
 
 	QSize sizeHint() { return QSize(480+(pageRender()->leftSidePanelColumns()+pageRender()->rightSidePanelColumns())*12, 250); }
 

mainwindow.cpp

@@ -23,6 +23,7 @@
 #include <QList>
 #include <QMenuBar>
 #include <QMessageBox>
+#include <QPushButton>
 #include <QRadioButton>
 #include <QSaveFile>
 #include <QScreen>
@@ -180,6 +181,8 @@ void MainWindow::init()
 
 	QShortcut *blockShortCut = new QShortcut(QKeySequence(Qt::Key_Escape, Qt::Key_J), m_textView);
 	connect(blockShortCut, &QShortcut::activated, [=]() { m_textWidget->setCharacter(0x7f); });
+	QShortcut *insertModeShortCut = new QShortcut(QKeySequence(Qt::Key_Insert), this);
+	connect(insertModeShortCut, &QShortcut::activated, this, &MainWindow::toggleInsertMode);
 
 	setUnifiedTitleAndToolBarOnMac(true);
 
@@ -622,6 +625,15 @@ void MainWindow::zoomReset()
 	setSceneDimensions();
 }
 
+void MainWindow::toggleInsertMode()
+{
+	m_textWidget->setInsertMode(!m_textWidget->insertMode());
+	if (m_textWidget->insertMode())
+		m_insertModePushButton->setText("INSERT");
+	else
+		m_insertModePushButton->setText("OVERWRITE");
+}
+
 void MainWindow::createStatusBar()
 {
 	QLabel *subPageLabel = new QLabel("Subpage");
@@ -649,6 +661,12 @@ void MainWindow::createStatusBar()
 	m_cursorPositionLabel = new QLabel("Row 1 Column 1");
 	statusBar()->insertWidget(4, m_cursorPositionLabel);
 
+	m_insertModePushButton = new QPushButton("OVERWRITE");
+	m_insertModePushButton->setFlat(true);
+	m_insertModePushButton->setFocusProxy(m_textWidget);
+	statusBar()->addPermanentWidget(m_insertModePushButton);
+	connect(m_insertModePushButton, &QPushButton::clicked, this, &MainWindow::toggleInsertMode);
+
 	statusBar()->addPermanentWidget(new QLabel("Level"));
 
 	m_levelRadioButton[0] = new QRadioButton("1");

mainwindow.h

@@ -27,6 +27,7 @@
 #include <QGraphicsView>
 #include <QMainWindow>
 #include <QLabel>
+#include <QPushButton>
 #include <QToolButton>
 
 #include "mainwidget.h"
@@ -77,6 +78,8 @@ private slots:
 	void zoomOut();
 	void zoomReset();
 
+	void toggleInsertMode();
+
 private:
 	enum { m_MaxRecentFiles = 10 };
 
@@ -115,6 +118,7 @@ private:
 
 	QLabel *m_subPageLabel, *m_cursorPositionLabel;
 	QToolButton *m_previousSubPageButton, *m_nextSubPageButton;
+	QPushButton *m_insertModePushButton;
 	QRadioButton *m_levelRadioButton[4];
 
 	QString m_curFile;