vrplayer: added help about and fix seg fault when closing

vrplayer/mainwindow.cpp

@@ -483,3 +483,13 @@ void MainWindow::onMoveCompleted()
     interface->setVcrOp(VCR_PLAY);
     vcrFlag = VCR_PLAY;
 }
+
+void MainWindow::on_actionAbout_triggered()
+{
+    QMessageBox msgBox;
+
+    msgBox.setText("VRPlayer version 1.2");
+    msgBox.setStandardButtons(QMessageBox::Ok);
+    msgBox.setDefaultButton(QMessageBox::Ok);
+    msgBox.exec();
+}

vrplayer/mainwindow.h

@@ -79,6 +79,8 @@ private slots:
     void onSliderActionTriggered(int value);
     void onMoveCompleted();
 
+    void on_actionAbout_triggered();
+
 protected:
     void resizeEvent(QResizeEvent *e);
     void closeEvent(QCloseEvent *e);

vrplayer/mainwindow.ui

@@ -31,7 +31,14 @@
     <addaction name="separator"/>
     <addaction name="actionExit"/>
    </widget>
+   <widget class="QMenu" name="menuHelp">
+    <property name="title">
+     <string>Help</string>
+    </property>
+    <addaction name="actionAbout"/>
+   </widget>
    <addaction name="menuFile"/>
+   <addaction name="menuHelp"/>
   </widget>
   <widget class="QToolBar" name="mainToolBar">
    <attribute name="toolBarArea">
@@ -55,6 +62,11 @@
     <string>Exit application</string>
    </property>
   </action>
+  <action name="actionAbout">
+   <property name="text">
+    <string>About</string>
+   </property>
+  </action>
  </widget>
  <layoutdefault spacing="6" margin="11"/>
  <resources/>