Add undo stack

Add an instance of QUndoStack in the mainwindow, and add undo/redo
actions in the edit menu. The QUndoStack will have a collection
of QUndoCommands to process the undo and redo events.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

qt-ui/mainwindow.cpp

@@ -36,6 +36,7 @@
 #include "usermanual.h"
 #endif
 #include <QNetworkProxy>
+#include <QUndoStack>
 
 MainWindow *MainWindow::m_Instance = NULL;
 
@@ -180,6 +181,16 @@ MainWindow::MainWindow() : QMainWindow(),
 	toolBar->setContentsMargins(zeroMargins);
 
 	updateManager = new UpdateManager(this);
+
+	undoStack = new QUndoStack(this);
+	QAction *undoAction = undoStack->createUndoAction(this, tr("&Undo"));
+	QAction *redoAction = undoStack->createRedoAction(this, tr("&Redo"));
+	undoAction->setShortcut(QKeySequence(Qt::CTRL + Qt::Key_Z));
+	redoAction->setShortcut(QKeySequence(Qt::CTRL + Qt::SHIFT + Qt::Key_Z));
+	QList<QAction*>undoRedoActions;
+	undoRedoActions.append(undoAction);
+	undoRedoActions.append(redoAction);
+	ui.menu_Edit->addActions(undoRedoActions);
 }
 
 MainWindow::~MainWindow()

qt-ui/mainwindow.h

@@ -34,6 +34,7 @@ class DivePlannerWidget;
 class ProfileWidget2;
 class PlannerDetails;
 class PlannerSettingsWidget;
+class QUndoStack;
 
 enum MainWindowTitleFormat {
 	MWTF_DEFAULT,
@@ -88,6 +89,7 @@ public:
 	void printPlan();
 	void checkSurvey(QSettings *s);
 	void setApplicationState(const QByteArray& state);
+	QUndoStack *undoStack;
 private
 slots:
 	/* file menu action */