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Application hangs after using up/down arrows in scrollbar of scrollarea widget

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

    How huge is this QScrollArea ?

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

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    • V Offline
      V Offline
      Vidya H
      wrote on last edited by
      #5

      7dfe986e-ee5a-4ab8-b964-2bbcf2d2abe1-image.png

      This is how the screen looks like. I have hidden sensitive information.

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

        Can you provide a minimal compilable example that reproduces this behavior ?

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

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        • V Offline
          V Offline
          Vidya H
          wrote on last edited by Vidya H
          #7

          I tested the example code in Qt and it works fine on the target board. I am using linuxfb platform. Could this be something to do with the environment variables?

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          • V Offline
            V Offline
            Vidya H
            wrote on last edited by
            #8

            @SGaist , could you please help on this issue? Is this due to Qt framework or my application or root file system or environment variables setting? I want to narrow down the issue.

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            • O Offline
              O Offline
              OZVID Technologies
              wrote on last edited by
              #9
              This post is deleted!
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              • V Vidya H

                I am running a Qt5.15 based application on a embedded Linux platform target. I have a QScrollArea widget to display particular information. There is a scrollbar with up and down arrows.

                When I use the scrollbar, the scrolling is smooth. However, when I press and hold the up/down arrow, it starts to scroll and within few seconds, the UI hangs.

                Please suggest how to fix this. Let me know if further details are required.

                E Offline
                E Offline
                ElizabethTurner
                wrote on last edited by
                #10
                This post is deleted!
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                • V Vidya H

                  @SGaist , could you please help on this issue? Is this due to Qt framework or my application or root file system or environment variables setting? I want to narrow down the issue.

                  SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #11

                  @Vidya-H If the Qt example is working properly on the target then it means that something is wrong with your application.

                  Not knowing more about it, one classical way to find the issue is to remove everything from the application then add gradually things back until it breaks again.

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

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                  • V Offline
                    V Offline
                    Vidya H
                    wrote on last edited by
                    #12

                    Okay. I added delay of 20 millisecond when scroll bar value changed. I am seeing performance improvement with this. The application hang frequency has reduced drastically. Is this a correct approach? Please suggest.

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                    • SGaistS Offline
                      SGaistS Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote on last edited by
                      #13

                      No it's not a correct approach.
                      You have to find what is currently slowing down your application.
                      Like I wrote above, the most basic version of it is starting from scratch adding your elements one at a time to determine what is going wrong.
                      Another option is to instrument your application and analyse it with a tool such as Hotspot.

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

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                      • V Offline
                        V Offline
                        Vidya H
                        wrote on last edited by
                        #14

                        Thank you for the support. I will use this tool for further analysis.

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