Implement row insertion and deletion

document.cpp

@@ -279,10 +279,12 @@ void TeletextDocument::cursorRight()
 	emit cursorMoved();
 }
 
-void TeletextDocument::moveCursor(int newCursorRow, int newCursorColumn)
+void TeletextDocument::moveCursor(int cursorRow, int cursorColumn)
 {
-	m_cursorRow = newCursorRow;
-	m_cursorColumn = newCursorColumn;
+	if (cursorRow != -1)
+		m_cursorRow = cursorRow;
+	if (cursorColumn != -1)
+		m_cursorColumn = cursorColumn;
 	emit cursorMoved();
 }
 
@@ -410,6 +412,97 @@ void BackspaceCommand::undo()
 }
 
 
+InsertRowCommand::InsertRowCommand(TeletextDocument *teletextDocument, bool copyRow, QUndoCommand *parent) : QUndoCommand(parent)
+{
+	m_teletextDocument = teletextDocument;
+	m_subPageIndex = teletextDocument->currentSubPageIndex();
+	m_row = teletextDocument->cursorRow();
+	m_copyRow = copyRow;
+}
+
+void InsertRowCommand::redo()
+{
+	m_teletextDocument->selectSubPageIndex(m_subPageIndex);
+	m_teletextDocument->moveCursor(m_row, -1);
+	// 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
+	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
+		for (int c=0; c<40; c++)
+			m_teletextDocument->currentSubPage()->setCharacter(m_row, c, ' ');
+		setText(QObject::tr("insert blank row"));
+	}
+	emit m_teletextDocument->refreshNeeded();
+}
+
+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
+	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();
+}
+
+
+DeleteRowCommand::DeleteRowCommand(TeletextDocument *teletextDocument, QUndoCommand *parent) : QUndoCommand(parent)
+{
+	m_teletextDocument = teletextDocument;
+	m_subPageIndex = teletextDocument->currentSubPageIndex();
+	m_row = teletextDocument->cursorRow();
+}
+
+void DeleteRowCommand::redo()
+{
+	m_teletextDocument->selectSubPageIndex(m_subPageIndex);
+	m_teletextDocument->moveCursor(m_row, -1);
+	// 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
+	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));
+	// If we deleted the FastText row blank that row, otherwise blank the last row
+	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();
+}
+
+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
+	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();
+}
+
+
 InsertSubPageCommand::InsertSubPageCommand(TeletextDocument *teletextDocument, bool afterCurrentSubPage, bool copySubPage, QUndoCommand *parent) : QUndoCommand(parent)
 {
 	m_teletextDocument = teletextDocument;

document.h

@@ -152,6 +152,35 @@ private:
 	bool m_copySubPage;
 };
 
+class InsertRowCommand : public QUndoCommand
+{
+public:
+	InsertRowCommand(TeletextDocument *, bool, QUndoCommand *parent = 0);
+
+	void redo() override;
+	void undo() override;
+
+private:
+	TeletextDocument *m_teletextDocument;
+	int m_subPageIndex, m_row;
+	bool m_copyRow;
+	unsigned char m_deletedBottomRow[40];
+};
+
+class DeleteRowCommand : public QUndoCommand
+{
+public:
+	DeleteRowCommand(TeletextDocument *, QUndoCommand *parent = 0);
+
+	void redo() override;
+	void undo() override;
+
+private:
+	TeletextDocument *m_teletextDocument;
+	int m_subPageIndex, m_row;
+	unsigned char m_deletedRow[40];
+};
+
 class SetColourCommand : public QUndoCommand
 {
 public:

mainwindow.cpp

@@ -324,6 +324,20 @@ void MainWindow::createActions()
 */
 #endif // !QT_NO_CLIPBOARD
 
+	QAction *insertBlankRowAct = editMenu->addAction(tr("Insert blank row"));
+	insertBlankRowAct->setStatusTip(tr("Insert a blank row at the cursor position"));
+	connect(insertBlankRowAct, &QAction::triggered, [=]() { insertRow(false); } );
+
+	QAction *insertCopyRowAct = editMenu->addAction(tr("Insert copy row"));
+	insertCopyRowAct->setStatusTip(tr("Insert a row that's a copy of the row at the cursor position"));
+	connect(insertCopyRowAct, &QAction::triggered, [=]() { insertRow(true); } );
+
+	QAction *deleteRowAct = editMenu->addAction(tr("Delete row"));
+	deleteRowAct->setStatusTip(tr("Delete the row at the cursor position"));
+	connect(deleteRowAct, &QAction::triggered, this, &MainWindow::deleteRow);
+
+	editMenu->addSeparator();
+
 	QAction *insertBeforeAct = editMenu->addAction(tr("&Insert subpage before"));
 	insertBeforeAct->setStatusTip(tr("Insert a blank subpage before this subpage"));
 	connect(insertBeforeAct, &QAction::triggered, [=]() { insertSubPage(false, false); });
@@ -538,6 +552,20 @@ void MainWindow::setSceneDimensions()
 	}
 }
 
+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);
+}
+
+void MainWindow::deleteRow()
+{
+	QUndoCommand *deleteRowCommand = new DeleteRowCommand(m_textWidget->document());
+	m_textWidget->document()->undoStack()->push(deleteRowCommand);
+}
+
 void MainWindow::insertSubPage(bool afterCurrentSubPage, bool copyCurrentSubPage)
 {
 	QUndoCommand *insertSubPageCommand = new InsertSubPageCommand(m_textWidget->document(), afterCurrentSubPage, copyCurrentSubPage);

mainwindow.h

@@ -63,6 +63,8 @@ private slots:
 	void updatePageWidgets();
 	void updateCursorPosition();
 
+	void insertRow(bool);
+	void deleteRow();
 	void insertSubPage(bool, bool);
 
 	void setSceneDimensions();