[Interest] Semi transparent background for contextual menu

[Nicolas Krieger]

You're right. I think having a semi-opaque contextual menu is feasible, 
but the management has to be done by the application and no more by Qt.

Thank's for your answers

Nicolas


Le 17/03/2017 à 20:03, Etienne Sandré-Chardonnal a écrit :
> Child widget transparency is rendered by Qt styles directly. On the 
> other hand, on a top level window, transparency must be handled by the 
> system. This is completely different.
>
> It is actually possible but more complicated to make transparent 
> windows, look for WA_TranslucentBackground.
>
> Cheers,
>
> Etienne
>
> 2017-03-17 9:59 GMT+01:00 Nicolas Krieger 
> <nicolas.krieger-medecom29 at orange.fr 
> <mailto:nicolas.krieger-medecom29 at orange.fr>>:
>
>     Hi,
>
>     Thank you for the answer. I made it work with your help, but I
>     lost the transparency of  the popup.
>
>     If the widget has a parent, there is transparency, but I lost the
>     Qt::ActiveWindowFocusReason when I lost focus
>
>     Le 16/03/2017 à 22:38, Etienne Sandré-Chardonnal a écrit :
>>     I forgot, in order to detect when the window lost "focus" (ie is
>>     no longer the active window), you need to catch QFocusEvent, and
>>     check if reason() is Qt::ActiveWindowFocusReason
>>
>>     Cheers,
>>
>>     Etienne
>>
>>     2017-03-16 22:34 GMT+01:00 Etienne Sandré-Chardonnal
>>     <etienne.sandre at m4x.org <mailto:etienne.sandre at m4x.org>>:
>>
>>         Hi,
>>
>>         That's because a context menu is a system level window, not a
>>         widget.
>>         And what you call focus is in fact not focus, but active
>>         window. See QApplication::activeWindow
>>
>>         You create such a window by creating a QWidget with no parent
>>         and a WindowFlag:
>>
>>         QWidget(0, Qt::Popup);
>>
>>         2017-03-16 15:56 GMT+01:00 Nicolas Krieger
>>         <nicolas.krieger-medecom29 at orange.fr
>>         <mailto:nicolas.krieger-medecom29 at orange.fr>>:
>>
>>             Hi,
>>
>>             I try to have a contextual menu with a semi-transparent
>>             background. I didnt manage to to it with QMenu, so I
>>             decided to use a custom widget.
>>
>>             I have no problem to have a widget with a
>>             semi-transparent background, I just changed the alpha of
>>             the background color.
>>
>>             My problem is that I want this widget to behave like a
>>             contextual menu, that is to say, I want it to be closed
>>             when focus is lost. But this is lot as soon as I clic on
>>             a children-widget of this menu. I don't know how to do.
>>
>>             Nicolas Krieger
>>
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>>
>>
>
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