Implement cut, copy and paste

document.h

@@ -76,6 +76,8 @@ public:
 	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();

levelonecommands.cpp

@@ -17,6 +17,12 @@
  * 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"
@@ -340,6 +346,192 @@ void DeleteRowCommand::undo()
 }
 
 
+#ifndef QT_NO_CLIPBOARD
+CutCommand::CutCommand(TeletextDocument *teletextDocument, QUndoCommand *parent) : LevelOneCommand(teletextDocument, parent)
+{
+	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, 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
+	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;
+	}
+
+	if (m_clipboardDataWidth == 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)
+		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, m_column+m_clipboardDataWidth-1);
+		m_teletextDocument->cursorRight();
+	}
+}
+
+void PasteCommand::undo()
+{
+	if (m_clipboardDataWidth == 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++;
+	}
+}
+#endif // !QT_NO_CLIPBOARD
+
+
 InsertSubPageCommand::InsertSubPageCommand(TeletextDocument *teletextDocument, bool afterCurrentSubPage, bool copySubPage, QUndoCommand *parent) : LevelOneCommand(teletextDocument, parent)
 {
 	m_newSubPageIndex = m_subPageIndex + afterCurrentSubPage;

levelonecommands.h

@@ -20,6 +20,7 @@
 #ifndef LEVELONECOMMANDS_H
 #define LEVELONECOMMANDS_H
 
+#include <QByteArrayList>
 #include <QUndoCommand>
 
 #include "document.h"
@@ -150,6 +151,38 @@ private:
 	unsigned char m_deletedRow[40];
 };
 
+#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 *, 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:

mainwidget.cpp

@@ -17,7 +17,9 @@
  * along with QTeletextMaker.  If not, see <https://www.gnu.org/licenses/>.
  */
 
+#include <QApplication>
 #include <QBitmap>
+#include <QClipboard>
 #include <QFrame>
 #include <QGraphicsItem>
 #include <QGraphicsItemGroup>
@@ -25,6 +27,7 @@
 #include <QGraphicsScene>
 #include <QKeyEvent>
 #include <QMenu>
+#include <QMimeData>
 #include <QPainter>
 #include <QPair>
 #include <QUndoCommand>
@@ -387,6 +390,48 @@ void TeletextWidget::toggleCharacterBit(unsigned char bitToToggle)
 	m_teletextDocument->undoStack()->push(new ToggleMosaicBitCommand(m_teletextDocument, bitToToggle));
 }
 
+void TeletextWidget::selectionToClipboard()
+{
+	QByteArray nativeData;
+	QClipboard *clipboard = QApplication::clipboard();
+
+	nativeData.resize(2 + m_teletextDocument->selectionWidth() * m_teletextDocument->selectionHeight());
+	nativeData[0] = m_teletextDocument->selectionHeight();
+	nativeData[1] = m_teletextDocument->selectionWidth();
+
+	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);
+
+	QMimeData *mimeData = new QMimeData();
+	mimeData->setData("application/x-teletext", nativeData);
+	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));
+}
+
 QPair<int, int> TeletextWidget::mouseToRowAndColumn(const QPoint &mousePosition)
 {
 	int row = mousePosition.y() / 10;

mainwidget.h

@@ -75,6 +75,11 @@ public slots:
 	void setBlackBackgroundSubst(bool);
 	void setSidePanelWidths(int, int);
 	void setSidePanelAtL35Only(bool);
+
+	void cut();
+	void copy();
+	void paste();
+
 	void changeSize();
 
 protected:
@@ -96,6 +101,7 @@ private:
 	int m_flashTiming, m_flashPhase;
 
 	void timerEvent(QTimerEvent *event) override;
+	void selectionToClipboard();
 
 	QPair<int, int> mouseToRowAndColumn(const QPoint &);
 };

mainwindow.cpp

@@ -292,36 +292,33 @@ 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 "
+	cutAct->setStatusTip(tr("Cut the current selection's contents to the clipboard"));
-                            "clipboard"));
+	connect(cutAct, &QAction::triggered, m_textWidget, &TeletextWidget::cut);
-	connect(cutAct, &QAction::triggered, textWidget, &QTextEdit::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 "
+	copyAct->setStatusTip(tr("Copy the current selection's contents to the clipboard"));
-                             "clipboard"));
+	connect(copyAct, &QAction::triggered, m_textWidget, &TeletextWidget::copy);
-	connect(copyAct, &QAction::triggered, textWidget, &QTextEdit::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 "
+	pasteAct->setStatusTip(tr("Paste the clipboard's contents into the current selection"));
-                              "selection"));
+	connect(pasteAct, &QAction::triggered, m_textWidget, &TeletextWidget::paste);
-	connect(pasteAct, &QAction::triggered, textWidget, &QTextEdit::paste);
 	editMenu->addAction(pasteAct);
 	editToolBar->addAction(pasteAct);
 
 	editMenu->addSeparator();
-*/
 #endif // !QT_NO_CLIPBOARD
 
 	QAction *insertBlankRowAct = editMenu->addAction(tr("Insert blank row"));