How to disable drag of QWidget with Qt::CustomizeWindowHint?

Question

I create simple QWidget with Qt::Window | Qt::CustomizeWindowHint flags + fixed size (OS: Windows 7). How can I disable dragging of this window by the top border?

Window created without title bar - so it should not be draggable by mouse. Is it bug in Qt (4.8.4)?

Code:

#include <QtGui/QApplication>
#include <QWidget>

int main( int argc, char *argv[] )
{
    QApplication a(argc, argv);
    QWidget w;
    w.setWindowFlags( Qt::Window | Qt::CustomizeWindowHint );
    w.setFixedSize( 300, 200 );
    w.show();
    return a.exec();
}

Screenshot:

UPD: please, do not propose Qt::FramelessWindowHint, because it completery removes border.

The only question is: Why dragging is available only for top border?

Reported as bug: QT-BUG-31144

Answer 1

You could set your whole widget as disabled.

http://qt-project.org/doc/qt-4.8/qwidget.html#setDisabled

http://qt-project.org/doc/qt-4.8/qwidget.html#enabled-prop

Or you could try making a frameless window.

http://qt-project.org/doc/qt-4.8/widgets-windowflags.html

Or subclass your own QFrame, and have it consume any mouse events on it.

http://qt-project.org/doc/qt-4.8/qframe.html

http://qt-project.org/doc/qt-4.8/qmouseevent.html

Hope that helps.

To prevent moving specifically in windows you can look into handling:

WM_NCHITTEST

http://msdn.microsoft.com/en-us/magazine/cc301402.aspx