[SOLVED] Add custom actions for menu shown upon clicking the title bar icon

[bharath144]

Hello all,

I have a need to add a custom action (say 'About' clicking which a messagebox needs to be displayed) in the context menu (system menu) shown when the icon on the title bar of a QDialog is clicked. How do I achieve this?

!http://i.msdn.microsoft.com/dynimg/IC163369.png!

Regards,
Bharath

[bharath144]

I tried doing this.

@ setContextMenuPolicy(Qt::CustomContextMenu);
connect(this, SIGNAL(customContextMenuRequested(QPoint)),
this, SLOT(addContextMenuAction(QPoint)));@

In this case the slot isn't getting called when I click on the window title icon or right click any where on the title bar (which displays the popup menu with Maximize, Minimize and Close actions).

Regards,
Bharath

[bharath144]

Hello,

I found the way to solve this. The solution is specific to windows platform. Here's what I did.

1. Add a separator and 'About' text to the system menu
   @HMENU sysMenu = ::GetSystemMenu((HWND) winId(), FALSE);
   if (sysMenu != NULL) {
   ::AppendMenuA(sysMenu, MF_SEPARATOR, 0, 0);
   ::AppendMenuA(sysMenu, MF_STRING, IDM_ABOUTBOX, "About");
   }@

2. Override QWidget::nativeEvent (in Qt 5.x) or QWidget::winEvent (in Qt 4.x) and handle the event
   @ MSG msg = (MSG) message;
   Q_UNUSED(type)

   if (msg->message == WM_SYSCOMMAND) {
   if ((msg->wParam & 0xfff0) == IDM_ABOUTBOX) {
   *result = 0;
   // Show the About dialog
   displayAboutInformation();

        return true;
    }
   

   }

   return false;@

3. IDM_ABOUTBOX is defined as below
   @// IDM_ABOUTBOX must be in the system command range
   // (IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX)
   // and (IDM_ABOUTBOX < 0xF000)
   #define IDM_ABOUTBOX 0x0010@

4. Include user32 in the pro file
   @LIBS += -lUser32@

I got this information from an older thread "https://qt-project.org/forums/viewthread/21165":https://qt-project.org/forums/viewthread/21165