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  4. widget with Qt::WA_NoSystemBackground attribute make text coincides with previous text
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widget with Qt::WA_NoSystemBackground attribute make text coincides with previous text

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  • SGaistS Offline
    SGaistS Offline
    SGaist
    Lifetime Qt Champion
    wrote on last edited by
    #2

    Hi,

    What is your question ?

    Interested in AI ? www.idiap.ch
    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

    hello qterH 1 Reply Last reply
    0
    • SGaistS SGaist

      Hi,

      What is your question ?

      hello qterH Offline
      hello qterH Offline
      hello qter
      wrote on last edited by
      #3

      @SGaist

      in this programm,when i change the label's text,the previous text does't disappear,old and new text show together
      and i must have the code(widget.setAttribute(Qt::WA_NoSystemBackground);) to solve some issue

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      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #4

        What issues do you have that requires that attribute set ?

        Interested in AI ? www.idiap.ch
        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

        hello qterH 1 Reply Last reply
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        • SGaistS SGaist

          What issues do you have that requires that attribute set ?

          hello qterH Offline
          hello qterH Offline
          hello qter
          wrote on last edited by
          #5

          @SGaist sorry for reply later and my unskilled english
          Because flicker appears When i run my application in embedeed system,then i found that set that attribute will solve the issue,But another issue comes,as you see in that picture,the previouse text and the new text show together.Yestoday i found that setAttribute(Qt::WA_TranslucentBackground) worked,But it makes the widget's background transparent

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          • SGaistS Offline
            SGaistS Offline
            SGaist
            Lifetime Qt Champion
            wrote on last edited by
            #6

            Did you try to track the reason of the flickering ?

            What else are you doing that could trigger that ?

            Interested in AI ? www.idiap.ch
            Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

            hello qterH 1 Reply Last reply
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            • SGaistS SGaist

              Did you try to track the reason of the flickering ?

              What else are you doing that could trigger that ?

              hello qterH Offline
              hello qterH Offline
              hello qter
              wrote on last edited by
              #7

              @SGaist The reason of the flickering i have asked in another topic,the main code bring the issue is
              QGraphicsView view;
              view.setViewport(new QGLWidget)
              i don't know how it happen

              thank you very much

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              • SGaistS Offline
                SGaistS Offline
                SGaist
                Lifetime Qt Champion
                wrote on last edited by
                #8

                Ok, then can you explain exactly what is the original problem you have since everything seems related to that flickering issue ? Are you trying to put a label over a QGraphicsScene ? Are you trying to have text on that scene ?

                Interested in AI ? www.idiap.ch
                Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                hello qterH 1 Reply Last reply
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                • SGaistS SGaist

                  Ok, then can you explain exactly what is the original problem you have since everything seems related to that flickering issue ? Are you trying to put a label over a QGraphicsScene ? Are you trying to have text on that scene ?

                  hello qterH Offline
                  hello qterH Offline
                  hello qter
                  wrote on last edited by
                  #9

                  @SGaist neither,the original problem is my application flicker in embedded system, i tracked that
                  QGraphicsView view;
                  view.setViewport(new QGLWidget)
                  this code case the problem,But i have no any idea why,I have tryed to track the Qt open-source but failed,then i found that
                  this->setAttribute(Qt::WA_NoSystemBackground)
                  this code is effective,But it bring a new problem that the text overlapping,Then i found that set the transparent attribute will solve the overlapping problem,
                  so this problem seems has solved

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                  • SGaistS Offline
                    SGaistS Offline
                    SGaist
                    Lifetime Qt Champion
                    wrote on last edited by
                    #10

                    Did you check that your embedded system has proper OpenGL support ?

                    Interested in AI ? www.idiap.ch
                    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                    hello qterH 1 Reply Last reply
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                    • SGaistS SGaist

                      Did you check that your embedded system has proper OpenGL support ?

                      hello qterH Offline
                      hello qterH Offline
                      hello qter
                      wrote on last edited by
                      #11

                      @SGaist Yes,it support OpenGL

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