ui: Added singleton QtContextMenu with global back and forward actions

* QtContextMenu holds default actions for back and forward
* additional actions can be passed to extend the default menu
* currently used in QtMainWindow and QtCodeArea
* fixed crash on undo when only view actions happened since project load

bug id = 108

src/lib_gui/CMakeLists.txt

@@ -52,6 +52,8 @@ add_files(
 	qt/network/QtTcpWrapper.cpp
 	qt/network/QtTcpWrapper.h
 
+	qt/utility/QtContextMenu.cpp
+	qt/utility/QtContextMenu.h
 	qt/utility/QtDeviceScaledPixmap.cpp
 	qt/utility/QtDeviceScaledPixmap.h
 	qt/utility/QtHighlighter.cpp

src/lib_gui/qt/element/QtCodeArea.cpp

@@ -21,6 +21,7 @@
 #include "data/location/TokenLocationFile.h"
 #include "qt/element/QtCodeFile.h"
 #include "qt/element/QtCodeSnippet.h"
+#include "qt/utility/QtContextMenu.h"
 #include "qt/utility/QtHighlighter.h"
 #include "settings/ApplicationSettings.h"
 #include "settings/ColorScheme.h"
@@ -498,10 +499,7 @@ void QtCodeArea::contextMenuEvent(QContextMenuEvent* event)
 	if (m_setIDECursorPositionAction != nullptr)
 	{
 		m_eventPosition = event->pos();
-
-		QMenu menu(this);
-		menu.addAction(m_setIDECursorPositionAction);
-		menu.exec(event->globalPos());
+		QtContextMenu::getInstance()->showExtended(event, this, std::vector<QAction*>(1, m_setIDECursorPositionAction));
 	}
 }
 

src/lib_gui/qt/utility/QtContextMenu.cpp

@@ -0,0 +1,67 @@
+#include "qt/utility/QtContextMenu.h"
+
+#include <QMenu>
+#include <QContextMenuEvent>
+
+#include "utility/messaging/type/MessageRedo.h"
+#include "utility/messaging/type/MessageUndo.h"
+
+std::shared_ptr<QtContextMenu> QtContextMenu::s_instance;
+
+QtContextMenu* QtContextMenu::getInstance()
+{
+	if (!s_instance)
+	{
+		s_instance = std::make_shared<QtContextMenu>();
+	}
+
+	return s_instance.get();
+}
+
+QtContextMenu::QtContextMenu()
+{
+	m_undoAction = new QAction(tr("Back"), this);
+	m_undoAction->setStatusTip(tr("Go back to last active symbol"));
+	m_undoAction->setToolTip(tr("Go back to last active symbol"));
+	connect(m_undoAction, SIGNAL(triggered()), this, SLOT(undoActionTriggered()));
+
+	m_redoAction = new QAction(tr("Forward"), this);
+	m_redoAction->setStatusTip(tr("Go forward to next active symbol"));
+	m_redoAction->setToolTip(tr("Go forward to next active symbol"));
+	connect(m_redoAction, SIGNAL(triggered()), this, SLOT(redoActionTriggered()));
+}
+
+void QtContextMenu::showDefault(QContextMenuEvent* event, QWidget* origin)
+{
+	showExtended(event, origin, std::vector<QAction*>());
+}
+
+void QtContextMenu::showExtended(QContextMenuEvent* event, QWidget* origin, const std::vector<QAction*>& actions)
+{
+	QMenu menu(origin);
+
+	menu.addAction(m_undoAction);
+	menu.addAction(m_redoAction);
+
+	if (actions.size())
+	{
+		menu.addSeparator();
+
+		for (QAction* action : actions)
+		{
+			menu.addAction(action);
+		}
+	}
+
+	menu.exec(event->globalPos());
+}
+
+void QtContextMenu::undoActionTriggered()
+{
+	MessageUndo().dispatch();
+}
+
+void QtContextMenu::redoActionTriggered()
+{
+	MessageRedo().dispatch();
+}

src/lib_gui/qt/utility/QtContextMenu.h

@@ -0,0 +1,31 @@
+#ifndef QT_CONTEXT_MENU_H
+#define QT_CONTEXT_MENU_H
+
+#include <QAction>
+#include <QObject>
+
+class QtContextMenu
+	: public QObject
+{
+	Q_OBJECT
+
+public:
+	static QtContextMenu* getInstance();
+
+	QtContextMenu();
+
+	void showDefault(QContextMenuEvent* event, QWidget* origin);
+	void showExtended(QContextMenuEvent* event, QWidget* origin, const std::vector<QAction*>& actions);
+
+private slots:
+	void undoActionTriggered();
+	void redoActionTriggered();
+
+private:
+	static std::shared_ptr<QtContextMenu> s_instance;
+
+	QAction* m_undoAction;
+	QAction* m_redoAction;
+};
+
+#endif // QT_CONTEXT_MENU_H

src/lib_gui/qt/window/QtMainWindow.cpp

@@ -12,6 +12,7 @@
 
 #include "component/view/View.h"
 #include "component/view/CompositeView.h"
+#include "qt/utility/QtContextMenu.h"
 #include "qt/utility/utilityQt.h"
 #include "qt/view/QtViewWidgetWrapper.h"
 #include "qt/window/project_wizzard/QtProjectWizzard.h"
@@ -139,8 +140,6 @@ QtMainWindow::QtMainWindow()
 	setWindowIcon(QIcon((ResourcePaths::getGuiPath() + "icon/logo_1024_1024.png").c_str()));
 	setWindowFlags(Qt::Widget);
 
-//	QApplication::setOverrideCursor(Qt::ArrowCursor);
-
 	QApplication* app = dynamic_cast<QApplication*>(QCoreApplication::instance());
 	app->installEventFilter(new MouseReleaseFilter(this));
 	app->installEventFilter(new MouseWheelFilter(this));
@@ -314,6 +313,11 @@ void QtMainWindow::keyPressEvent(QKeyEvent* event)
 	}
 }
 
+void QtMainWindow::contextMenuEvent(QContextMenuEvent* event)
+{
+	QtContextMenu::getInstance()->showDefault(event, this);
+}
+
 void QtMainWindow::activateWindow()
 {
 	this->setEnabled(true);

src/lib_gui/qt/window/QtMainWindow.h

@@ -89,6 +89,7 @@ public:
 protected:
 	bool event(QEvent* event);
 	void keyPressEvent(QKeyEvent* event);
+	void contextMenuEvent(QContextMenuEvent* event);
 
 public slots:
 	void activateWindow();
@@ -157,6 +158,7 @@ private:
 	QAction* m_viewSeparator;
 	QAction** m_recentProjectAction;
 	QAction* m_showTitleBarsAction;
+
 	bool m_showDockWidgetTitleBars;
 
 	QtWindowStack m_windowStack;