Qt. How to combine mouseMoveEvent and mousePressEvent events?

Question

Qt

It is necessary to draw a rectangle (I was going to do this by calling paintEvent) while holding down the left mouse button, and after releasing it, place this rectangle in a vector.

It is clear that for clamping - mousePressEvent, for tracking movement - mouseMoveEvent, and for releasing - mouseLeaveEvent (I enabled mouseTracking). The question is, how do I combine the actions of these events? After all, you need to draw not when moving, and not when clamping, but when clamping and moving at the same time.

Answer 1

There are two great things in programming - the boolean flag and the conditional operator. Their combination makes it possible to solve this problem. These are the very basics.