Qt Widget Overlays

Answer 1

If they're child of a widget without a layout, you should be able to move them around as you please, I think.

Answer 2

You just need to create your QPushButton (or any QWidget), indicate its parent QWidget and then display it.

Don't add it to the parent layout else you will not be able to move it as you want.

Don't forget to indicate its parent else it will be displayed as independant QWidget.

In these conditions your QPushButton will be considered as child of the QWidget but not member of the parent's layout. So it will be a "floating" child and you must manage it's behaviour when resizing parent's QWidget.

If you want a unified behaviour for all overlay buttons, you should subclass QLayout and redefine members bahaviour.