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  1. Qt
  2. QTBUG-55510

Windows are the wrong size when moved between monitors with different DPI

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Details

    • Bug
    • Resolution: Out of scope
    • Not Evaluated
    • None
    • 5.7.0
    • QPA: Windows
    • None
    • Windows 10

    Description

      On windows, when you move a window between two monitors with differing DPI the window keeps the same raw pixel dimensions, so either the content ends up squashed or cut when moving from low DPI -> high DPI or the window ends up bigger than the screen in the other direction. The window should keep the same logical size relative to its content instead.

      For anyone else having this problem, as a workaround you can force system DPI scaling so the window is down/upscaled by windows when it's not on the primary display using the following code at the top of main():

      #ifdef _WIN32
  {
    typedef BOOL (*SetProcessDpiAwarenessT)(int value);
    QLibrary user32("user32.dll", NULL);
    SetProcessDpiAwarenessT SetProcessDpiAwarenessD =
        (SetProcessDpiAwarenessT)user32.resolve("SetProcessDpiAwarenessInternal");
    if (SetProcessDpiAwarenessD)
      SetProcessDpiAwarenessD(1); //PROCESS_PER_MONITOR_DPI_AWARE
  }
#endif

      Attachments

        1. qtbug55510.zip
          5 kB
          Friedemann Kleint

        Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-55449 Window and Widgets are scaled inproperly when per-monitor-dpi awareness is set and application is moved between 1080p/4k monitors

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-58959 QMessageBox does not scale well when using per monitor dpiawareness mode

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-55639 [REG: 5.5.1->5.6.1] QDockWidget cannot be properly docked on a secondary screen that has negative position

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
          For Gerrit Dashboard: QTBUG-55510
          # Subject Branch Project Status CR V
          185451,2 Resize the window when the screen's dpi changes 5.9 qt/qtbase Status: MERGED +2 0
          199461,7 Windows QPA: Further restrict windows for WM_DPICHANGED 5.9 qt/qtbase Status: MERGED +2 0

          Activity

            People

              kleint Friedemann Kleint
              patstew Patrick Stewart
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              Dates

                Created:
                Updated:
                Resolved:

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