WindowStaysOnTopHint

[roxton]

Hello! I want to implement a simple function to toggle normal window/on top state. For this, I write this code:

Qt::WindowFlags f = 0;
 
  Qt::WindowFlags flags = windowFlags ();
  if (flags & Qt::WindowStaysOnTopHint)
      f = Qt::Window;
  else
      {
       f = Qt::Window;
       f |= Qt::WindowStaysOnTopHint;
      }
  setWindowFlags (f);

Qt::WindowFlags f = 0;

  Qt::WindowFlags flags = windowFlags ();
  if (flags & Qt::WindowStaysOnTopHint)
      f = Qt::Window;
  else
      {
       f = Qt::Window;
       f |= Qt::WindowStaysOnTopHint;
      }
  setWindowFlags (f);

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But when I run it, the window just disappears.

[jacek]

If you want to toggle one flag use this code:

Qt::WindowFlags flags = windowFlags();
flags ^= Qt::WindowStaysOnTopHint;
setWindowFlags( flags );

Qt::WindowFlags flags = windowFlags();
flags ^= Qt::WindowStaysOnTopHint;
setWindowFlags( flags );

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[roxton]

But the window disappears anyway!
I'm trying to apply this "toggle" to the main window.
P.S.: Qt 4.4, Linux

[roxton]

Update:
This code works fine ,and the window is visible:

Qt::WindowFlags flags = windowFlags();
  flags ^= Qt::WindowStaysOnTopHint;
  setWindowFlags( flags );
  show();
  activateWindow();

Qt::WindowFlags flags = windowFlags();
  flags ^= Qt::WindowStaysOnTopHint;
  setWindowFlags( flags );
  show();
  activateWindow();

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[McKee]

The documentation for setWindowFlags() states that it calls setParent(), which in turn documents that it hides the window, necessitating the call to show(). But it appears you discovered that.

I have another question related to WindowStaysOnTopHint. I notice that when I toggle the option on my top level widget (by means of a checkbox in the window itself), the widget is automatically repositioned on the screen. It's harmless but annoying. Is there a simple way to suppress that repositioning action?

[Boy]

The documentation for setWindowFlags() states that it calls setParent(), which in turn documents that it hides the window, necessitating the call to show(). But it appears you discovered that.

I have another question related to WindowStaysOnTopHint. I notice that when I toggle the option on my top level widget (by means of a checkbox in the window itself), the widget is automatically repositioned on the screen. It's harmless but annoying. Is there a simple way to suppress that repositioning action?

I don't know, but my guess is maybe by reimplementing the paint function (paintEvent()?) and set a position you want it to be drawn an then call its parents paint function

[kaushal_gaurav]

But using

Qt::WindowFlags flags = windowFlags();
        flags ^= Qt::WindowStaysOnTopHint;
        setWindowFlags( flags );
        show();
        activateWindow();

Qt::WindowFlags flags = windowFlags();
        flags ^= Qt::WindowStaysOnTopHint;
        setWindowFlags( flags );
        show();
        activateWindow();

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the window remains on the top of all running applications. what if we just want it to be bound with my application and not other applications running.

When i press ALT + Tab the window whose flag was set remains on top of new application..this is not what is expected..

What can be done to avoid this behavior and retaining WindowStaysOnTopHint?