Allow header row editing

src/qteletextdecoder/document.cpp

@@ -68,6 +68,7 @@ TeletextDocument::TeletextDocument()
 	m_undoStack = new QUndoStack(this);
 	m_cursorRow = 1;
 	m_cursorColumn = 0;
+	m_rowZeroAllowed = false;
 	m_selectionCornerRow = m_selectionCornerColumn = -1;
 	m_selectionSubPage = nullptr;
 
@@ -252,7 +253,7 @@ void TeletextDocument::cursorUp(bool shiftKey)
 	if (shiftKey && !selectionActive())
 		setSelectionCorner(m_cursorRow, m_cursorColumn);
 
-	if (--m_cursorRow == 0)
+	if (--m_cursorRow == 0 - (int)m_rowZeroAllowed)
 		m_cursorRow = 24;
 
 	if (shiftKey)
@@ -269,7 +270,7 @@ void TeletextDocument::cursorDown(bool shiftKey)
 		setSelectionCorner(m_cursorRow, m_cursorColumn);
 
 	if (++m_cursorRow == 25)
-		m_cursorRow = 1;
+		m_cursorRow = (int)!m_rowZeroAllowed;
 
 	if (shiftKey)
 		emit selectionMoved();
@@ -333,6 +334,13 @@ void TeletextDocument::moveCursor(int cursorRow, int cursorColumn, bool selectio
 	emit cursorMoved();
 }
 
+void TeletextDocument::setRowZeroAllowed(bool allowed)
+{
+	m_rowZeroAllowed = allowed;
+	if (m_cursorRow == 0 && !allowed)
+		cursorDown();
+}
+
 void TeletextDocument::setSelectionCorner(int row, int column)
 {
 	if (m_selectionCornerRow != row || m_selectionCornerColumn != column) {

src/qteletextdecoder/document.h

@@ -89,6 +89,8 @@ public:
 	void cursorLeft(bool shiftKey=false);
 	void cursorRight(bool shiftKey=false);
 	void moveCursor(int cursorRow, int cursorColumn, bool selectionInProgress=false);
+	bool rowZeroAllowed() const { return m_rowZeroAllowed; };
+	void setRowZeroAllowed(bool allowed);
 	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); }
@@ -123,6 +125,7 @@ private:
 	std::vector<LevelOnePage *> m_recycleSubPages;
 	QUndoStack *m_undoStack;
 	int m_cursorRow, m_cursorColumn, m_selectionCornerRow, m_selectionCornerColumn;
+	bool m_rowZeroAllowed;
 	LevelOnePage *m_selectionSubPage;
 	ClutModel *m_clutModel;
 };

src/qteletextmaker/loadformats.cpp

@@ -274,6 +274,22 @@ bool LoadT42Format::load(QFile *inFile, TeletextDocument *document)
 				document->subPage(0)->setControlBit(PageBase::C13NOS, m_inLine[9] & 0x04);
 				document->subPage(0)->setControlBit(PageBase::C14NOS, m_inLine[9] & 0x02);
 
+				// See if there's text in the header row
+				bool headerText = false;
+
+				for (int i=10; i<42; i++)
+					if (m_inLine[i] != 0x20) {
+						// TODO - obey odd parity?
+						m_inLine[i] &= 0x7f;
+						headerText = true;
+					}
+				if (headerText) {
+					// Clear the page address and control bits to spaces before putting the row in
+					for (int i=0; i<10; i++)
+						m_inLine[i] = 0x20;
+
+					document->subPage(0)->setPacket(0, QByteArray((const char *)&m_inLine[2], 40));
+				}
 				continue;
 			}
 		}

src/qteletextmaker/mainwidget.cpp

@@ -543,8 +543,10 @@ QPair<int, int> TeletextWidget::mouseToRowAndColumn(const QPoint &mousePosition)
 {
 	int row = mousePosition.y() / 10;
 	int column = mousePosition.x() / 12 - m_pageDecode.leftSidePanelColumns();
-	if (row < 1)
-		row = 1;
+	const int topRow = (int)!m_teletextDocument->rowZeroAllowed();
+
+	if (row < topRow)
+		row = topRow;
 	if (row > 24)
 		row = 24;
 	if (column < 0)
@@ -647,6 +649,9 @@ LevelOneScene::LevelOneScene(QWidget *levelOneWidget, QObject *parent) : QGraphi
 	m_mainGridItemGroup = new QGraphicsItemGroup;
 	m_mainGridItemGroup->setVisible(false);
 	addItem(m_mainGridItemGroup);
+	m_rowZeroGridItemGroup = new QGraphicsItemGroup;
+	m_rowZeroGridItemGroup->setVisible(false);
+	addItem(m_rowZeroGridItemGroup);
 	// Additional vertical pieces of grid for side panels
 	for (int i=0; i<32; i++) {
 		m_sidePanelGridNeeded[i] = false;
@@ -654,14 +659,17 @@ LevelOneScene::LevelOneScene(QWidget *levelOneWidget, QObject *parent) : QGraphi
 		m_sidePanelGridItemGroup[i]->setVisible(false);
 		addItem(m_sidePanelGridItemGroup[i]);
 	}
-	for (int r=1; r<25; r++) {
+	for (int r=0; 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);
+			gridPiece->setPen(QPen(QBrush(QColor(128, 128, 128, (r != 0 && r != 24) ? 192 : 128)), 0));
+			if (r == 0)
+				m_rowZeroGridItemGroup->addToGroup(gridPiece);
+			else
+				m_mainGridItemGroup->addToGroup(gridPiece);
 		}
 
-		if (r < 24)
+		if (r != 0 && 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));
@@ -686,6 +694,7 @@ void LevelOneScene::setBorderDimensions(int sceneWidth, int sceneHeight, int wid
 
 	// Position grid to cover central 40 columns
 	m_mainGridItemGroup->setPos(leftRightBorders + leftSidePanelColumns*12, topBottomBorders);
+	m_rowZeroGridItemGroup->setPos(leftRightBorders + leftSidePanelColumns*12, topBottomBorders);
 
 	updateCursor();
 	updateSelection();
@@ -772,12 +781,23 @@ void LevelOneScene::setRenderMode(TeletextPageRender::RenderMode renderMode)
 void LevelOneScene::toggleGrid(bool gridOn)
 {
 	m_grid = gridOn;
+
 	m_mainGridItemGroup->setVisible(gridOn);
+	if (static_cast<TeletextWidget *>(m_levelOneProxyWidget->widget())->document()->rowZeroAllowed())
+		m_rowZeroGridItemGroup->setVisible(gridOn);
 	for (int i=0; i<32; i++)
 		if (m_sidePanelGridNeeded[i])
 			m_sidePanelGridItemGroup[i]->setVisible(gridOn);
 }
 
+void LevelOneScene::toggleRowZeroAllowed(bool allowed)
+{
+	static_cast<TeletextWidget *>(m_levelOneProxyWidget->widget())->document()->setRowZeroAllowed(allowed);
+
+	if (m_grid)
+		m_rowZeroGridItemGroup->setVisible(allowed);
+}
+
 void LevelOneScene::hideGUIElements(bool hidden)
 {
 	if (hidden) {

src/qteletextmaker/mainwidget.h

@@ -125,6 +125,7 @@ public slots:
 	void updateSelection();
 	void setRenderMode(TeletextPageRender::RenderMode renderMode);
 	void toggleGrid(bool gridOn);
+	void toggleRowZeroAllowed(bool allowed);
 	void hideGUIElements(bool hidden);
 	void setFullScreenColour(const QColor &newColor);
 	void setFullRowColour(int row, const QColor &newColor);
@@ -143,7 +144,7 @@ private:
 	QGraphicsRectItem *m_fullRowLeftRectItem[25], *m_fullRowRightRectItem[25];
 	QGraphicsProxyWidget *m_levelOneProxyWidget;
 	QGraphicsRectItem *m_cursorRectItem, *m_selectionRectItem;
-	QGraphicsItemGroup *m_mainGridItemGroup, *m_sidePanelGridItemGroup[32];
+	QGraphicsItemGroup *m_mainGridItemGroup, *m_rowZeroGridItemGroup, *m_sidePanelGridItemGroup[32];
 	bool m_grid, m_sidePanelGridNeeded[32];
 };
 

src/qteletextmaker/mainwindow.cpp

@@ -576,6 +576,13 @@ void MainWindow::createActions()
 	m_deleteSubPageAction->setStatusTip(tr("Delete this subpage"));
 	connect(m_deleteSubPageAction, &QAction::triggered, this, &MainWindow::deleteSubPage);
 
+	editMenu->addSeparator();
+
+	m_rowZeroAct = editMenu->addAction(tr("Edit header row"));
+	m_rowZeroAct->setCheckable(true);
+	m_rowZeroAct->setStatusTip(tr("Allow editing of header row"));
+	connect(m_rowZeroAct, &QAction::toggled, m_textScene, &LevelOneScene::toggleRowZeroAllowed);
+
 	QMenu *viewMenu = menuBar()->addMenu(tr("&View"));
 
 	QAction *revealAct = viewMenu->addAction(tr("&Reveal"));
@@ -1090,6 +1097,12 @@ void MainWindow::loadFile(const QString &fileName)
 
 	m_reExportWarning = loadingFormat->reExportWarning();
 
+	for (int i=0; i<m_textWidget->document()->numberOfSubPages(); i++)
+		if (m_textWidget->document()->subPage(i)->packetExists(0)) {
+			m_rowZeroAct->setChecked(true);
+			break;
+		}
+
 	setCurrentFile(fileName);
 	statusBar()->showMessage(tr("File loaded"), 2000);
 }

src/qteletextmaker/mainwindow.h

@@ -131,6 +131,7 @@ private:
 	QAction *m_borderActs[3];
 	QAction *m_aspectRatioActs[4];
 	QAction *m_smoothTransformAction;
+	QAction *m_rowZeroAct;
 
 	QLabel *m_subPageLabel, *m_cursorPositionLabel;
 	QToolButton *m_previousSubPageButton, *m_nextSubPageButton;

src/qteletextmaker/saveformats.cpp

@@ -202,6 +202,10 @@ void SaveTTIFormat::writeSubPageStart(const PageBase &subPage, int subPageNumber
 
 void SaveTTIFormat::writeSubPageBody(const PageBase &subPage)
 {
+	// Header row
+	if (subPage.packetExists(0))
+		writePacket(format7BitPacket(subPage.packet(0)), 0);
+
 	// FLOF links
 	bool writeFLCommand = false;
 	if (m_document->pageFunction() == TeletextDocument::PFLevelOnePage && subPage.packetExists(27,0)) {
@@ -358,19 +362,27 @@ int SaveT42Format::writePacket(QByteArray packet, int packetNumber, int designat
 
 void SaveT42Format::writeSubPageStart(const PageBase &subPage, int subPageNumber)
 {
+	QByteArray packet;
+
 	// Convert integer to Binary Coded Decimal
 	subPageNumber = QString::number(subPageNumber).toInt(nullptr, 16);
 
-	// Displayable row header we export as spaces, hence the (odd parity valid) 0x20 init value
-	QByteArray packet(42, 0x20);
-
 	m_magazineNumber = (m_document->pageNumber() & 0xf00) >> 8;
 	if (m_magazineNumber == 8)
 		m_magazineNumber = 0;
 
-	// Write X/0 separately as it features both Hamming 8/4 and 7-bit odd parity within
-	packet[0] = m_magazineNumber & 0x07;
-	packet[1] = 0; // Packet number 0
+	// Retrieve and apply odd parity to header row if there's text there,
+	// otherwise create an initial packet of (odd parity valid) spaces
+	if (subPage.packetExists(0))
+		packet = format7BitPacket(subPage.packet(0));
+	else
+		packet.fill(0x20, 40);
+
+	// Byte 1 of MRAG - packet number 0
+	packet.prepend((char)0);
+	// Byte 0 of MRAG - magazine number, and packet number 0
+	packet.prepend(m_magazineNumber & 0x07);
+
 	packet[2] = m_document->pageNumber() & 0x00f;
 	packet[3] = (m_document->pageNumber() & 0x0f0) >> 4;
 	packet[4] = subPageNumber & 0xf;