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  1. Qt
  2. QTBUG-135429

Title bar cannot be restored after using QWidget::setGeometry

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Details

    • Bug
    • Resolution: Unresolved
    • P2: Important
    • None
    • 6.8.1
    • Widgets: Widgets and Dialogs
    • None
    • Windows 11
    • Windows

    Description

      When a window is in fullscreen mode and setGeometry is called, it loses the ability to restore the title bar.

      I've only tested on Windows.

      From the debugging I've done, it seems like the issue is caused by setGeometry changing the window state, but not calling SetWindowPos to refresh the style. Then, when calling showNormal after setGeometry, the state (and therefore the style) is not updated because the widget thinks it's still in the same state and early returns.

       

      Noteworthy functions:

      QWidgetPrivate::setGeometry_sys
QWindowsBaseWindow::setGeometry_sys
QWindowsWindow::setWindowState_sys

       

      Code to reproduce: 

      QApplication application(argc, argv);	
QMainWindow window;

window.showFullScreen();

// Commenting the following line prevents the bug from happening 
// Can also be move or resize, they have the same behavior 
window.setGeometry(100, 50, 500, 500);

window.showNormal();

application.exec();

       

      The issue can be worked around by using the following code instead of showNormal:

      HWND hwnd = reinterpret_cast<HWND>(window.winId());

LONG_PTR style = GetWindowLongPtr(hwnd, GWL_STYLE);
		
style = WS_POPUP | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN | WS_SIZEBOX | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX | WS_MAXIMIZEBOX;	
	
SetWindowLongPtr(hwnd, GWL_STYLE, style);
		
SetWindowPos(hwnd, nullptr, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE | SWP_NOZORDER | SWP_NOACTIVATE | SWP_FRAMECHANGED); 

window.show();

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-135434 Issue with showNormal after moving window to a different screen in fullscreen

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • In Progress
          For Gerrit Dashboard: QTBUG-135429
          # Subject Branch Project Status CR V
          658184,3 When window is full screen update it's normal geometry if os accepts it dev qt/qtbase Status: NEW 0 0

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            People

              morteza.jamshidi Morteza Jamshidi
              felixsoftdrive Félix Lamontagne
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              Dates

                Created:
                Updated:

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