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  1. Qt
  2. QTBUG-94782

QPropertyAnimation doesn't work properly in Linux

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    Details

    • Type: Bug
    • Status: Reported
    • Priority: P2: Important
    • Resolution: Unresolved
    • Affects Version/s: 6.2.0 Alpha, 5.15.0 RC2
    • Fix Version/s: None
    • Labels:
      None
    • Environment:
      Fedora 34 x64, Xfce 4.16, GCC 11.1.1
    • Platform/s:
      Linux/X11

      Description

      Bug reproduction:

      1. Create a new Qt Widgets project with a default QWidget or QMainWindow.

      2. Write following codes to add the fade-in effect on that default Widget:

       

      void
      MainWindow::show()
      {
          QPropertyAnimation *fadeInAnimation = new QPropertyAnimation(this, "windowOpacity");
          fadeInAnimation->setDuration(2000);
          fadeInAnimation->setStartValue(0);
          fadeInAnimation->setEndValue(1);
          fadeInAnimation->start(QAbstractAnimation::DeleteWhenStopped);
          QWidget::show();
      }
      

      3. Compile and run.

       

      I tested the same code in Microsoft Windows 10 with Qt MinGW 8.1.0 and it worked like a charm.

      However, in Linux, the problem is that the fading animation will show properly only when I keep moving mouse cursor inside the window. Otherwise, the animation will be omitted. it will just wait for 2 seconds before showing up a totally opaque window directly.

      I tested with Qt 6.2.0 Alpha and Qt 5.15.2 and this problem occurs in both of the versions.

       

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            People

            Assignee:
            qt.team.quick.subscriptions Qt Quick and Widgets Team
            Reporter:
            zxfksie Xiang Zhang
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              Dates

              Created:
              Updated:

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