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Can't see Items List of QComboBox, when use showFullScreen

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  • mrjjM mrjj

    Hi
    That sounds really odd.
    So the QComboBoxes are shown on screen but when you click to open the dropdown list, there is no items in it anymore?
    No other widgets does strange things when showFullScreen is used ?

    Q Offline
    Q Offline
    Qingshui Kong
    wrote on last edited by
    #3

    @mrjj Hi
    Thank you for replying so quickly!

    Yes, it is very odd.

    I find there is one more widget doing the strange things. It is QDateTimeEdit. It acts the same with QComboBox.

    What's more, even though I can't see dropdown list, I can select one item by clicking.

    mrjjM 1 Reply Last reply
    0
    • Q Qingshui Kong

      @mrjj Hi
      Thank you for replying so quickly!

      Yes, it is very odd.

      I find there is one more widget doing the strange things. It is QDateTimeEdit. It acts the same with QComboBox.

      What's more, even though I can't see dropdown list, I can select one item by clicking.

      mrjjM Offline
      mrjjM Offline
      mrjj
      Lifetime Qt Champion
      wrote on last edited by
      #4

      @Qingshui-Kong
      Hi
      Would be possible to test with newer/newest version of Qt ?

      Also, did full screen work at some point but stopped or this is from beginning ?

      Im wondering if it could be some sort of gfx driver issue or font rendering issue.

      Q 1 Reply Last reply
      0
      • mrjjM mrjj

        @Qingshui-Kong
        Hi
        Would be possible to test with newer/newest version of Qt ?

        Also, did full screen work at some point but stopped or this is from beginning ?

        Im wondering if it could be some sort of gfx driver issue or font rendering issue.

        Q Offline
        Q Offline
        Qingshui Kong
        wrote on last edited by
        #5

        @mrjj
        Hi,

        I haven't install newer version of Qt. So I can't test it now. Could you help to test that?

        Full screen doesn't work. At least, I haven't seen that it works. So I think this is from the beginning.

        If it is some sort of gfx driver issue or font rendering issue, how could I confirm it and how could I fix it?

        Thanks!

        mrjjM 1 Reply Last reply
        0
        • Q Qingshui Kong

          @mrjj
          Hi,

          I haven't install newer version of Qt. So I can't test it now. Could you help to test that?

          Full screen doesn't work. At least, I haven't seen that it works. So I think this is from the beginning.

          If it is some sort of gfx driver issue or font rendering issue, how could I confirm it and how could I fix it?

          Thanks!

          mrjjM Offline
          mrjjM Offline
          mrjj
          Lifetime Qt Champion
          wrote on last edited by mrjj
          #6

          @Qingshui-Kong
          hi
          well i tested with
          https://www.dropbox.com/s/3hlqg2hqm22m3gu/testfullscreen.zip?dl=0
          and it works as expected.
          Could You try same sample ?

          Well you can check if any new drivers are available for your gfx card if not already done. ( like from Intel or nvidia)

          Q 1 Reply Last reply
          1
          • mrjjM mrjj

            @Qingshui-Kong
            hi
            well i tested with
            https://www.dropbox.com/s/3hlqg2hqm22m3gu/testfullscreen.zip?dl=0
            and it works as expected.
            Could You try same sample ?

            Well you can check if any new drivers are available for your gfx card if not already done. ( like from Intel or nvidia)

            Q Offline
            Q Offline
            Qingshui Kong
            wrote on last edited by
            #7

            @mrjj
            Hi,

            Thank you very much!

            This sample works.

            Maybe, my program is a little complex. I should debug my program to find out the problem.

            mrjjM 1 Reply Last reply
            0
            • Q Qingshui Kong

              @mrjj
              Hi,

              Thank you very much!

              This sample works.

              Maybe, my program is a little complex. I should debug my program to find out the problem.

              mrjjM Offline
              mrjjM Offline
              mrjj
              Lifetime Qt Champion
              wrote on last edited by
              #8

              @Qingshui-Kong
              Hi
              ok, that is good news. \o/
              Its just a normal bug then.
              Do you start app at once in full screen or
              you toggle it ? ( like sample)

              Q 1 Reply Last reply
              1
              • mrjjM mrjj

                @Qingshui-Kong
                Hi
                ok, that is good news. \o/
                Its just a normal bug then.
                Do you start app at once in full screen or
                you toggle it ? ( like sample)

                Q Offline
                Q Offline
                Qingshui Kong
                wrote on last edited by
                #9

                @mrjj
                Hi

                I start app at once in full screen. I use w.showFullscreen() in the main() function.

                mrjjM 1 Reply Last reply
                0
                • Q Qingshui Kong

                  @mrjj
                  Hi

                  I start app at once in full screen. I use w.showFullscreen() in the main() function.

                  mrjjM Offline
                  mrjjM Offline
                  mrjj
                  Lifetime Qt Champion
                  wrote on last edited by
                  #10

                  @Qingshui-Kong
                  hi
                  ok, i tried with sample that way too but still there are items.
                  So it seems its something in the real app code.
                  if you just do // w.showFullscreen()
                  then there is items visible ?
                  How do you fill the items to the combobox. any chance they can be empty strings for some reason ?

                  Q 1 Reply Last reply
                  0
                  • mrjjM mrjj

                    @Qingshui-Kong
                    hi
                    ok, i tried with sample that way too but still there are items.
                    So it seems its something in the real app code.
                    if you just do // w.showFullscreen()
                    then there is items visible ?
                    How do you fill the items to the combobox. any chance they can be empty strings for some reason ?

                    Q Offline
                    Q Offline
                    Qingshui Kong
                    wrote on last edited by
                    #11

                    @mrjj
                    Hi,
                    Yes, there should be some bugs in my app code.

                    If I use w.show() in the main function, it works.

                    I am sure that I have fill the items to the combobox. And I can select them by clicking, even though I can't see them.

                    1 Reply Last reply
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                    • AndySA Offline
                      AndySA Offline
                      AndyS
                      Moderators
                      wrote on last edited by
                      #12

                      This is a known limitation on Windows, I suggest you have a look at https://doc.qt.io/qt-5/windows-issues.html#fullscreen-opengl-based-windows as that describes the problem in more detail and gives a solution which you can use.

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

                      Q 2 Replies Last reply
                      2
                      • AndySA AndyS

                        This is a known limitation on Windows, I suggest you have a look at https://doc.qt.io/qt-5/windows-issues.html#fullscreen-opengl-based-windows as that describes the problem in more detail and gives a solution which you can use.

                        Q Offline
                        Q Offline
                        Qingshui Kong
                        wrote on last edited by
                        #13

                        @AndyS

                        Thanks very much!

                        1 Reply Last reply
                        1
                        • AndySA AndyS

                          This is a known limitation on Windows, I suggest you have a look at https://doc.qt.io/qt-5/windows-issues.html#fullscreen-opengl-based-windows as that describes the problem in more detail and gives a solution which you can use.

                          Q Offline
                          Q Offline
                          Qingshui Kong
                          wrote on last edited by
                          #14

                          @AndyS

                          Hi AndyS,

                          Could you answer my another question?
                          Here is the link.
                          https://forum.qt.io/topic/95431/how-to-set-window-flags-for-qfiledialog

                          Thanks.

                          1 Reply Last reply
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