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  1. Qt
  2. QTBUG-76130

QDesktopWidget::primaryScreenChanged & QScreen::availableGeometryChanged do not get triggered consistently

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    Details

    • Type: Bug
    • Status: Reported
    • Priority: P2: Important
    • Resolution: Unresolved
    • Affects Version/s: 5.10.1
    • Fix Version/s: None
    • Labels:
      None
    • Environment:
      Ubuntu
    • Platform/s:
      Linux/X11, Windows

      Description

      I am trying to find a way to have my Qt app signaled when the user moves it from one monitor to another monitor. This is necessary to handle changes in screen sizes and dpi.
      Unfortunately, the only two things that I have found that might help here do not consistently produce a signal. I have only tried Ubuntu, not Windows nor MacOSX

      void
      MainGUIImpl::fileOpenInterfShow()

      { ... QDesktopWidget* theDTWidget = qApp->desktop(); QGuiApplication* theGuiApp = dynamic_cast<QGuiApplication*>(qApp); connect(theDTWidget, &QDesktopWidget::primaryScreenChanged, this, &MainGUIImpl::mainGUIPrimaryScreenChanged); connect(theGuiApp->primaryScreen(), &QScreen::availableGeometryChanged, this, &MainGUIImpl::mainGUIAvailGeomChanged); ... }

      // End of MainGUIImpl::fileOpenInterfShow()

      void MainGUIImpl::mainGUIAvailGeomChanged(const QRect &newqrect)

      { fprintf(stderr,"AVAILABLE GUI SIZE CHANGED TO: [%d,%d,%d,%d]\n", newqrect.x(),newqrect.y(),newqrect.width(),newqrect.height()); }

      void MainGUIImpl::mainGUIPrimaryScreenChanged()

      { fprintf(stderr,"MAIN GUI SCREEN CHANGED\n"); }

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            Assignee:
            qt.team.quick.subscriptions Qt Quick and Widgets Team
            Reporter:
            daveb David Baumgartner
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              Dates

              Created:
              Updated:

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