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  1. Qt
  2. QTBUG-112537

A Window's background cannot be semitransparent anymore

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    • bf0f1fa7d (dev), 87fdd0cf8 (6.5), fd56ad806 (dev), 941fb88d0 (6.6), 5a85af7e0 (6.5)

    Description

      I was migrating all the projects I've been working on from Qt5 to Qt6 to take advantage of the new Material 3 implementation in Qt Quick Controls, when I realized that all my splash screens and all the custom window decorations (rounded corners or translucid title bars) are broken.

      Check and run this simple example with the qml tool. At least on Microsoft Windows, the alpha channel is not respected anymore when used as window color:

      import QtQuick.Controls

ApplicationWindow {
    width: 200
    height: 200
    visible: true
    flags: Qt.SplashScreen | Qt.WindowStaysOnTopHint
    color: "transparent" // this doesn't work in Qt 6.5.0
}

      I've tried other flags and changing the color (e.g. #00FF0000) without success. It still shows a 200x200 semitransparent rectangle.

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          duplicates

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-112473 Background of splash screen of QtQuick example Window and Screen is not transparent

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; Flaky tests; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-109603 Window transparency doesn't work

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; Flaky tests; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-112473 Background of splash screen of QtQuick example Window and Screen is not transparent

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; Flaky tests; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-112524 The Color Property of Window is no Effect

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
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              tvete Paul Olav Tvete
              ceperez1996 Carlos Pérez
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                Updated:
                Resolved: