[Interest] Semi transparent background for contextual menu

[Nicolas Krieger]

I have finally managed to do what I wanted to. I herited from QMenu with 
the following attributes, so that the window is transparent. Then, I add 
a widget (with QWidgetAction) with a semi-opaque background.

Snippet

setAttribute( Qt::WA_TranslucentBackground );
setWindowFlags( windowFlags() | Qt::FramelessWindowHint | Qt::NoDropShadowWindowHint ); 

setStyleSheet( "QMenu{background:rgba(0, 0, 0, 0%);}" );

Nicolas Krieger

Le 20/03/2017 à 11:21, Nicolas Krieger a écrit :
>
> 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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>
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