Changing AlwaysOnTop window flag

[bpetty]

Hey guys. I have this app that the user can choose if he/she wants it always on top or not via a menu option. This is a chackable menu action that toggles the following method:

void MainForm::menuAlwaysOnTop(bool bEnable)
{
    if (bEnable == true)
    {
        // This line is hiding my window :(
        setWindowFlags(windowFlags() | Qt::WindowStaysOnTopHint);
    }
    else
    {
        // remove Qt::WindowStaysOnTopHint
    }
}

void MainForm::menuAlwaysOnTop(bool bEnable)
{
    if (bEnable == true)
    {
        // This line is hiding my window :(
        setWindowFlags(windowFlags() | Qt::WindowStaysOnTopHint);
    }
    else
    {
        // remove Qt::WindowStaysOnTopHint
    }
}

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My MainForm class derives from QMainWindow. The problem I am having is that when this method runs... my window disappears! Augh. I can't explain why. Does anyone have an idea of what I can do to fix this?

[jacek]

Does it disappear when bEnable is true or when it's false?

[wysota]

Did you try calling show() on the widget again?

[bpetty]

It happens when bEnable == true. ... calling show() right afterwords did the trick. Is this by design? It seems a little funny.

[jacek]

It seems a little funny.

Indeed, it's weird, but it musn't be necessarily Qt's fault.

[bpetty]

For all of those interested in a working code snippet 4 your own projects:

ui.actionAlwaysOnTop->setCheckable(true);
connect(ui.actionAlwaysOnTop, SIGNAL(toggled(bool)), this, SLOT(menuAlwaysOnTop(bool)));
 
...
 
void MainForm::menuAlwaysOnTop(bool bEnable)
{
    if (bEnable == true)
    {
        setWindowFlags(windowFlags() | Qt::WindowStaysOnTopHint);
    }
    else
    {
        setWindowFlags(windowFlags() & ~Qt::WindowStaysOnTopHint);
    }
 
    show();
}

ui.actionAlwaysOnTop->setCheckable(true);
connect(ui.actionAlwaysOnTop, SIGNAL(toggled(bool)), this, SLOT(menuAlwaysOnTop(bool)));

...

void MainForm::menuAlwaysOnTop(bool bEnable)
{
    if (bEnable == true)
    {
        setWindowFlags(windowFlags() | Qt::WindowStaysOnTopHint);
    }
    else
    {
        setWindowFlags(windowFlags() & ~Qt::WindowStaysOnTopHint);
    }

    show();
}

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