How do you distinguish between clicking and dragging?

Question

User interface

Actually, the question is: how do you do it so that a (mouse) click is guaranteed not to move anything? I still have this thing: a range of more than 4 pixels or a time of more than 400 ms. In this case, when you release it, it checks for a click and does not check for a drag - thus, if you move the mouse and hold it exactly in place for a long time, there will be no click or drag.
Thank you.

Answer 1

Why do you need time?