Dockable widgets in Qt are possible (example). However, usually one can dock a widget in a dockable area of a larger surrounding parent frame. I wonder whether there is a way to attach floating windows with each other, as it is possible in WinAmp (see screenshot).
Can someone point out whether something like this can be done with Qt?

!http://i.stack.imgur.com/igajc.png(winamp)!

What i tried so far: Created a second QMainWindow which overrides the moveEvent(QMoveEvent * event) function and calculate the distance to the parent QMainWindow (line 8). If the second window is near to the parent window, i move it directly next to the parent window (line 13).
My Problem with this approach: After i moved the second window, the mouse key is still pressed and the window moves back to the position before i automatically moved it.

My code example right now only works if you try to dock it on the left side of the parent window.
@void playlistWindow::moveEvent(QMoveEvent * event){
// Get positions of the two QMainWindows
QPoint childPosition = event->pos();
int frameWidth = this->frameGeometry().width() - this->width();
QPoint parentPosition = this->parentWidget()->pos();

// Calculate distance to parent Window
int diffRight = parentPosition.x() - childPosition.x() - this->width() - frameWidth;

// If it is near, move it to the frame of the parent window
if( diffRight > 5 && diffRight < 30 && !isDocked){
    isDocked = true;
    this->move(childPosition.x() + diffRight, childPosition.y());
} else {      
    if(diffRight > 30){
        isDocked = false;
    } 
}

}@
Is this the right way to do it?

Thanks for your help,

Buhmann