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How to keep physical window size constant when working with multiple monitors?

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  • Q Offline
    Q Offline
    Qt_User72653
    wrote on 19 Apr 2018, 16:41 last edited by
    #1

    I have a frameless window with a custom drop shadow applied to it, with a fixed sized widget in the window. The issue I'm having is that if I move the window between monitors with different DPIs the window resizes, which results in the drop shadow being drawn in the top left corner of the window, while the widget is drawn on the bottom right. The effect is that the drop shadow is 'split' from the widget when the window is resized.

    Is there any way to prevent a window from being resized in this case? I tried setting the size policy of it but that didn't work.

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    • M Offline
      M Offline
      mrjj
      Lifetime Qt Champion
      wrote on 19 Apr 2018, 17:50 last edited by
      #2

      Hi
      Do you intercept resizeEvent and recalculate the drop shadow ?
      also
      if you do this->setFixedSize(500,500);
      and qDebug () << this->width() << " - " << this->height();
      once moved. What does it say ?
      ( "this" is most likely mainwindow)

      Q 1 Reply Last reply 19 Apr 2018, 18:20
      1
      • M mrjj
        19 Apr 2018, 17:50

        Hi
        Do you intercept resizeEvent and recalculate the drop shadow ?
        also
        if you do this->setFixedSize(500,500);
        and qDebug () << this->width() << " - " << this->height();
        once moved. What does it say ?
        ( "this" is most likely mainwindow)

        Q Offline
        Q Offline
        Qt_User72653
        wrote on 19 Apr 2018, 18:20 last edited by Qt_User72653
        #3

        @mrjj said in How to keep physical window size constant when working with multiple monitors?:

        Do you intercept resizeEvent and recalculate the drop shadow ?

        No, I was hoping to just be able to 'cancel' the window resize.

        It looks like my mistake was in thinking that I wouldn't have to manually resize the drop shadow and the window.

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        • M Offline
          M Offline
          mrjj
          Lifetime Qt Champion
          wrote on 19 Apr 2018, 18:53 last edited by
          #4

          what values did u get from the test ?

          Q 1 Reply Last reply 19 Apr 2018, 19:07
          0
          • M mrjj
            19 Apr 2018, 18:53

            what values did u get from the test ?

            Q Offline
            Q Offline
            Qt_User72653
            wrote on 19 Apr 2018, 19:07 last edited by
            #5

            @mrjj

            500 and 500. It wasn't a Qt problem, just my understanding of how to fix the issue.

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            • M Offline
              M Offline
              mrjj
              Lifetime Qt Champion
              wrote on 19 Apr 2018, 19:13 last edited by
              #6

              Hi
              Ok super. just wanted to be sure. i assumed the mere movement would call for
              a recalc since its other monitor.

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              19 Apr 2018, 16:41

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