QMainWindow with own dialog taskbar icon

flautzr

Hi,

I have a dialog in an Application. The dialog is derived from QMainWindow and lives in the bigger Application which creates and destroys the dialog. I know that QmainWindow is not the correct class to use for a sub-dialog but changing that is a task for another day.

The issue is, when the dialog is open, it doesnt have a taskbar icon. When minimized, it reduces itself to a tiny window at the lower left corner where it can be reopened by clicking the respective icon on it but our customer wants it to be accessible through a taskbar icon.

I've read that it should actually be having an own icon by default, but since our App still uses MFC, there is a wrapper that ensures compatibility. Basically an instance of the wrapper class (QWinWidget) is created and the dialog is then created with the wrapper class as parent. I assume this is the cause for this behaviour.

Any ideas on how to achieve that?

Gojir4

Hi @flautzr ,

If you let the parent of your dialog to null_ptr, it should create a "standalone" window with its own taskbar icon.

JonB

@Gojir4
Ooohhh, that's a good one (provided it works!) :)

Hang on though! Remember, the OP is not using a QDialog for the "dialog" only a QMainWindow. Does that "null parent produces taskbar icon" require a Windows dialog?

flautzr

@Gojir4 This does work surprisingly ...

i never doubted your suggestion, what surprises me is the wrapper class around the dialog is not needed at all so now I have to talk to my fellow developer what this means.

thanks for the solution!

Gojir4

@JonB said in QMainWindow with own dialog taskbar icon:

Does that "null parent produces taskbar icon" require a Windows dialog?

That's behavior of any QWidget so no matter if it's a QMainWindow or a QDialog.
I just did test with Python and I see the same result using a dialog .

As said in the doc of QWidget:

If parent is nullptr, the new widget becomes a window. If parent is another widget, this widget becomes a child window inside parent. The new widget is deleted when its parent is deleted.