Snap/Dock QDialog to the edge of the screen

[durbrak]

Hello,
I have a subclassed QDialog. Now I want to implement this "snap" or also called "dock" feature - when the user moves the window somewhere next to the screen edge, the window automatically snaps/docks to that edge. It's a pretty handy feature, I guess.
Well, my idea is to use moveEvent() and see if the right edge of the window is (say 5pixels) away from the edge - if so: this->move(edgeOfScreen). But I can't think of something how the "undock" feature should work? I mean if the user wants to move the window away from the edge again he probably won't be able to do it since it always will snap/dock back to the edge... ? Any ideas ?

One more thing: I have QDialog::moveEvent here like this:

void MyWindow::moveEvent(QMoveEvent *moveEvent)
{
	moveEvent->ignore();
}

void MyWindow::moveEvent(QMoveEvent *moveEvent)
{
	moveEvent->ignore();
}

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Shouldn't Qt suppress the moving so the window can't be moved or do I misinterpret something here?