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  1. Qt
  2. QTBUG-40765

QQuickWidget::winId() breaks rendering

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Details

    • Bug
    • Resolution: Done
    • P3: Somewhat important
    • None
    • 5.3.1, 5.4.0
    • Quick: Widget
    • None

    Description

      If winId() gets called at any point on a qquickwidget instance (or even on any of the ancestors of the qquickwidget), rendering will stop immediately, turning it to a black window.
      stderr starts to repeat over and over:
      QQuickWidget cannot be used as a native child widget. Consider setting Qt::AA_DontCreateNativeWidgetSiblings

      Given that error message, the problem seems that winId() turns it into a native window and calls QWidgetPrivate::createWinId, breaking the conditions QQuickWidget needs in order to be able to render correctly.
      Attached there i a simple patch to the qquickwidget example (5.4 branch) that shows the problem.

      Attachments

        1. break.diff
          0.6 kB
        2. testcase.zip
          2 kB

        Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-41779 qtwebengine breaks on X11 if a QGLWidget or a widget with native window is in the same QMainWindow

          • 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; 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-41779 qtwebengine breaks on X11 if a QGLWidget or a widget with native window is in the same QMainWindow

          • 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; 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-48130 Calling winId() on a widget breaks QOpenGLWidget/QQuickWidget/QWebEngineView in the same TLW

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

          Suggestion - Public suggestions QTCREATORBUG-15727 Please port the welcome screen back to widgets

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed
          For Gerrit Dashboard: QTBUG-40765
          # Subject Branch Project Status CR V
          94880,3 Add a note about winId() to QQuickWidget 5.4 qt/qtdeclarative Status: MERGED +2 0
          94882,2 Add a note about winId() to QOpenGLWidget docs 5.4 qt/qtbase Status: MERGED +2 0

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            People

              lagocs Laszlo Agocs
              notmart Marco Martin
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              Dates

                Created:
                Updated:
                Resolved:

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