Drag n Drop Button and Drop-down menu PyQt/Qt designer

Question

I would like to know the \"best practice\" to change the behavior of some buttons to do the following:

I want with a click to appear a menu. Or when you drag this sa

Answer 1

If you want to draw a line between the buttons, it means you need to reimplement the "paintEvent" of the background widget (Possibly the parent widget of all subwidgets), as you said, this is NOT the best practice to do so. Instead, you need to use QGraphicsWidget, for drawing line, you need to use QGraphicsLineItem. It have the following member functions:

setAcceptDrops
dragEnterEvent ( QGraphicsSceneDragDropEvent * )
dragLeaveEvent ( QGraphicsSceneDragDropEvent * )
dragMoveEvent ( QGraphicsSceneDragDropEvent * )

In the PyQt4 installation folder, there should exist a folder naming examples\graphicsview\diagramscene, which you take it for a reference.