Unity UI IPointerClickHandler ignores drag threshold?

I am guessing IPointerClickHandler ignores drag threshold so as long as you press down and release on the same control it will register anyway?

Thing is I was using to test for clicks on the whole canvas/rect behind a load of controls and so it just fires even if you press and drag right across the screen and release which seems a bit weird.

Is this the intended functionality? Edit: seems can just check event for 'dragging' at least