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  1. Qt
  2. QTBUG-93497

Mac: drop-downs don't work when in the right or bottom and QT_SCALE_FACTOR is used

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    Details

    • Type: Bug
    • Status: Reported
    • Priority: P3: Somewhat important
    • Resolution: Unresolved
    • Affects Version/s: 5.12.10, 5.14.2, 5.15.2
    • Fix Version/s: None
    • Component/s: GUI: High-DPI
    • Labels:
      None
    • Platform/s:
      macOS

      Description

      We use Qt inside Adobe Illustrator. Illustrator offers custom UI scaling on top of OS scaling. We use QT_SCALE_FACTOR to have the extra scaling also in our Qt UI.

      When QT_SCALE_FACTOR is set (and > 1.0) the following issue occurs on macOS:

      When a drop-down is close to the right or bottom edge of the screen, then clicking on the drop-down does nothing, instead of showing a pop-up with all the entries.

      Namely, when QT_SCALE_FACTOR is 1.5, then it is the right resp. bottom 33% of the screen. If it is 2.0, then it is 50% on the right and 50% at the bottom.

      The rootcause: QWindow uses the logical coordinates, whereas QPlatformWindow and QCocoaWindow use the screen or native coordinates. Therefore when passing coordinates between these 2 objects, they need to be converted to or from native,

      Therefore, I believe the call window()->setGeometry(geometry()) in QCocoaWindow::initialize() is wrong. Instead, something like window()->setGeometry(QHighDpi::fromNativePixels(geometry(), window())) should be called.

      Patches for Qt 5.12.10, 5.14.2, 5.15.2 are attached.

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            Assignee:
            sorvig Morten Sørvig
            Reporter:
            jan.patera Jan Patera
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              Dates

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              Updated:

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