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  1. Qt
  2. QTBUG-57882

Cannot show maximized window minimized

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Details

    • Bug
    • Resolution: Done
    • P3: Somewhat important
    • 5.10.0 Alpha
    • 5.6.2, 5.7.1
    • Widgets: Widgets and Dialogs
    • None
    • Issue reproduced on Windows 10 with Qt 5.6.2, Fedora 25 Linux with Qt 5.7.1 and Qt 4.8.7.

    Description

      The Qt::WindowMaximized flag is cleared when setVisible(true) is called when QWidget::windowState() = Qt::WindowMaximized|Qt::WindowMinimized.

      #include <QApplication>
#include <QMainWindow>
#include <QtDebug>
#include <QTimer>

int main(int argc, char **argv)
{
    QApplication app(argc, argv);

    QMainWindow window;
    window.setWindowState(Qt::WindowMaximized | Qt::WindowMinimized);
    qDebug() << "window state after setting it: " <<  window.windowState();
    window.setVisible(true);

    QTimer timer;
    QObject::connect(&timer, &QTimer::timeout, [&window] {
        qDebug() << "window state: " <<  window.windowState();
    });
    timer.setInterval(2000);
    timer.start();
    app.exec();
}

      The program above will print the following output:

      window state after setting it:  QFlags<Qt::WindowState>(WindowMinimized|WindowMaximized)
window state:  QFlags<Qt::WindowState>(WindowMinimized)
window state:  QFlags<Qt::WindowState>(WindowMinimized)
window state:  QFlags<Qt::WindowState>(WindowMinimized)
window state:  QFlags<Qt::WindowState>(WindowMinimized)
window state:  QFlags<Qt::WindowState>(WindowMinimized)
window state:  QFlags<Qt::WindowState>(WindowMinimized)
window state:  QFlags<Qt::WindowState>(WindowNoState) # After clicking the button in task bar to unminimize
window state:  QFlags<Qt::WindowState>(WindowMaximized) # After clicking on maximize button in the window decoration
window state:  QFlags<Qt::WindowState>(WindowMaximized)
window state:  QFlags<Qt::WindowState>(WindowMaximized)
window state:  QFlags<Qt::WindowState>(WindowMinimized|WindowMaximized) # After clicking on minimize button in the window decoration
window state:  QFlags<Qt::WindowState>(WindowMinimized|WindowMaximized)
window state:  QFlags<Qt::WindowState>(WindowMinimized|WindowMaximized)

      This shows that the Qt::WindowMaximized | Qt::WindowMinimized state is perfectly legal, and I can set it, but it doesn't work when I do. Qt simply unsets it for me.

      If you comment in the the 200ms single-shot timer that sets the flag after a while the following output is produced:

      window state after setting it:  QFlags<Qt::WindowState>(WindowMinimized|WindowMaximized)
window state:  QFlags<Qt::WindowState>(WindowMinimized|WindowMaximized)
window state:  QFlags<Qt::WindowState>(WindowMinimized|WindowMaximized)
window state:  QFlags<Qt::WindowState>(WindowNoState) # After clicking the button in task bar to unminimize
window state:  QFlags<Qt::WindowState>(WindowNoState)
window state:  QFlags<Qt::WindowState>(WindowNoState)

      So not even a dirty workaround works.

      This may be the same issue that was reported in QTBUG-32753, but it was closed with resolution "Incomplete".

      Attachments

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-69711 [REG 5.9->5.10] QWindow doesn't restore previously maximized state after calling showMinimized()

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Reported

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-61595 setWindowState(Qt::WindowFullScreen) and showMinimized() does not work correctly together when QWindowsWindowFunctions::setHasBorderInFullScreen is set

          • P4: Low - Would be nice to fix, but it's not very important.
          • Closed

          Activity

            People

              ogoffart Olivier Goffart (Woboq GmbH)
              ts Thomas Sondergaard
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              2 Vote for this issue
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              Dates

                Created:
                Updated:
                Resolved: