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QGraphicsDropShadowEffect on form widget

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  • J Offline
    J Offline
    janfaroe
    wrote on last edited by
    #4

    Um, I'm not sure how that would work. I'm having one instance of the effect, which is applied only on the top level widget. Disabling it would sort of defeat the purpose.

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    • Chris KawaC Offline
      Chris KawaC Offline
      Chris Kawa
      Lifetime Qt Champion
      wrote on last edited by
      #5

      You can explicitly set a background color on the top level widget. This will force the drop shadow effect to treat it as a opaque rectangle (or whatever the shape is) and apply the effect around it leaving children unchanged.

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      • J Offline
        J Offline
        janfaroe
        wrote on last edited by
        #6

        I suppose you mean with a stylesheet? Just did this on the top level widget; did not stop the effect from propagating to the children:

        #MediaItemForm {
        background-color:#FFFFFF;
        }

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        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #7

          Sorry, I misread your post.

          From the documentation of QWidget::setGraphicsEffect:

          bq. Note: This function will apply the effect on itself and all its children.

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          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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          • J Offline
            J Offline
            janfaroe
            wrote on last edited by
            #8

            SGaist: Yes, but how to avoid it? It would be a terrible solution to subclass all child elements to ignore the effect.

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            • Chris KawaC Offline
              Chris KawaC Offline
              Chris Kawa
              Lifetime Qt Champion
              wrote on last edited by
              #9

              Hm, that's weird. This is what I'm getting with and without the background:
              !http://img46.imageshack.us/img46/9097/ifgk.jpg(drop shadow example)!

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              • raven-worxR Offline
                raven-worxR Offline
                raven-worx
                Moderators
                wrote on last edited by
                #10

                [quote author="janfaroe" date="1383368356"]SGaist: Yes, but how to avoid it? It would be a terrible solution to subclass all child elements to ignore the effect.[/quote]

                you can try a method which sets the effect for you (untested):
                @
                setDropShadowEffectOnWidgetOnly(QWidget* w)
                {
                if( ! w ) return;

                w->setGraphicsEffect( new QGraphicsDropShadowEffect );
                foreach( QWidget* child, this->findChildren<QWidget*>() )
                     child->setGraphicsEffect(0);   //unset effect for children
                

                }
                @

                --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
                If you have a question please use the forum so others can benefit from the solution in the future

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                • J Offline
                  J Offline
                  janfaroe
                  wrote on last edited by
                  #11

                  Chris Kawa: That's odd indeed. And you set bg color with style sheet? Could it be one of these things that despite all are platform dependent? Or because I'm using 5.2 beta?

                  [quote author="Chris Kawa" date="1383555753"]Hm, that's weird. This is what I'm getting with and without the background:
                  !http://img46.imageshack.us/img46/9097/ifgk.jpg(drop shadow example)![/quote]

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                  • J Offline
                    J Offline
                    janfaroe
                    wrote on last edited by
                    #12

                    Thanks for the suggestion. However, since I'm rendering quite a few parent widgets, it does not seem terribly efficient? But of course, if anything else fails, I might resort to it.

                    [quote author="raven-worx" date="1383557940"][quote author="janfaroe" date="1383368356"]SGaist: Yes, but how to avoid it? It would be a terrible solution to subclass all child elements to ignore the effect.[/quote]

                    you can try a method which sets the effect for you (untested):
                    @
                    setDropShadowEffectOnWidgetOnly(QWidget* w)
                    {
                    if( ! w ) return;

                    w->setGraphicsEffect( new QGraphicsDropShadowEffect );
                    foreach( QWidget* child, this->findChildren<QWidget*>() )
                         child->setGraphicsEffect(0);   //unset effect for children
                    

                    }
                    @[/quote]

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                    • raven-worxR Offline
                      raven-worxR Offline
                      raven-worx
                      Moderators
                      wrote on last edited by
                      #13

                      [quote author="janfaroe" date="1383558917"]Thanks for the suggestion. However, since I'm rendering quite a few parent widgets, it does not seem terribly efficient?
                      [/quote]
                      yes most probably.

                      --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
                      If you have a question please use the forum so others can benefit from the solution in the future

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                      • Chris KawaC Offline
                        Chris KawaC Offline
                        Chris Kawa
                        Lifetime Qt Champion
                        wrote on last edited by
                        #14

                        [quote author="janfaroe" date="1383558759"]Chris Kawa: That's odd indeed. And you set bg color with style sheet? Could it be one of these things that despite all are platform dependent? Or because I'm using 5.2 beta?
                        [/quote]

                        I'm using Qt5.1.1 with both VS2012 and MinGW. This is basically all the code I wrote:
                        @
                        ui->frame->setStyleSheet("QFrame { background-color: palette(window)}");
                        ui->frame->setGraphicsEffect(new QGraphicsDropShadowEffect(this));
                        ui->frame_2->setGraphicsEffect(new QGraphicsDropShadowEffect(this));
                        @

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