Add menu entries for undo/redo

Add an edit menu with undo and redo submenus, and connect them to
the UndoBuffer class. The submenus are only enabled when needed.

Signed-off-by: Grace Karanja <gracie.karanja89@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

qt-ui/mainwindow.cpp

@@ -31,6 +31,7 @@
 #include "usermanual.h"
 #endif
 #include <QNetworkProxy>
+#include "undobuffer.h"
 
 MainWindow *MainWindow::m_Instance = NULL;
 
@@ -77,6 +78,7 @@ MainWindow::MainWindow() : QMainWindow(),
 	connect(DivePlannerPointsModel::instance(), SIGNAL(planCreated()), this, SLOT(planCreated()));
 	connect(DivePlannerPointsModel::instance(), SIGNAL(planCanceled()), this, SLOT(planCanceled()));
 	connect(ui.printPlan, SIGNAL(pressed()), ui.divePlannerWidget, SLOT(printDecoPlan()));
+	connect(ui.menu_Edit, SIGNAL(aboutToShow()), this, SLOT(checkForUndoAndRedo()));
 #ifdef NO_PRINTING
 	ui.printPlan->hide();
 #endif
@@ -152,6 +154,7 @@ MainWindow::MainWindow() : QMainWindow(),
 	toolBar->setContentsMargins(zeroMargins);
 
 	updateManager = new UpdateManager(this);
+	undoBuffer = new UndoBuffer(this);
 }
 
 MainWindow::~MainWindow()
@@ -1466,3 +1469,19 @@ void MainWindow::on_actionFilterTags_triggered()
 	else
 		ui.multiFilter->setVisible(true);
 }
+
+void MainWindow::on_action_Undo_triggered()
+{
+	undoBuffer->undo();
+}
+
+void MainWindow::on_action_Redo_triggered()
+{
+	undoBuffer->redo();
+}
+
+void MainWindow::checkForUndoAndRedo()
+{
+	ui.action_Undo->setEnabled(undoBuffer->canUndo());
+	ui.action_Redo->setEnabled(undoBuffer->canRedo());
+}

qt-ui/mainwindow.h

@@ -30,6 +30,7 @@ class QWebView;
 class QSettings;
 class UpdateManager;
 class UserManual;
+class UndoBuffer;
 
 enum MainWindowTitleFormat {
 	MWTF_DEFAULT,
@@ -82,6 +83,7 @@ public:
 	void setPlanNotes(const char *notes);
 	void printPlan();
 	void checkSurvey(QSettings *s);
+	UndoBuffer *undoBuffer;
 private
 slots:
 	/* file menu action */
@@ -151,6 +153,9 @@ slots:
 	void on_paste_triggered();
 	void on_actionFilterTags_triggered();
 	void on_actionConfigure_Dive_Computer_triggered();
+	void on_action_Undo_triggered();
+	void on_action_Redo_triggered();
+	void checkForUndoAndRedo();
 
 protected:
 	void closeEvent(QCloseEvent *);

qt-ui/mainwindow.ui

@@ -195,7 +195,7 @@ p, li { white-space: pre-wrap; }
      <x>0</x>
      <y>0</y>
      <width>1682</width>
-     <height>27</height>
+     <height>25</height>
     </rect>
    </property>
    <widget class="QMenu" name="menuFile">
@@ -271,7 +271,15 @@ p, li { white-space: pre-wrap; }
     <addaction name="actionDownloadWeb"/>
     <addaction name="actionDivelogs_de"/>
    </widget>
+   <widget class="QMenu" name="menu_Edit">
+    <property name="title">
+     <string>&amp;Edit</string>
+    </property>
+    <addaction name="action_Undo"/>
+    <addaction name="action_Redo"/>
+   </widget>
    <addaction name="menuFile"/>
+   <addaction name="menu_Edit"/>
    <addaction name="menuImport"/>
    <addaction name="menuLog"/>
    <addaction name="menuView"/>
@@ -813,6 +821,22 @@ p, li { white-space: pre-wrap; }
     <string>User &amp;survey</string>
    </property>
   </action>
+  <action name="action_Undo">
+   <property name="text">
+    <string>&amp;Undo</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+Z</string>
+   </property>
+  </action>
+  <action name="action_Redo">
+   <property name="text">
+    <string>&amp;Redo</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+Shift+Z</string>
+   </property>
+  </action>
  </widget>
  <customwidgets>
   <customwidget>