Is OnMouseMove usually called when the user presses the left mouse button?

Because I override the OnMouseMove function in a widget and also OnMouseButtonDown. When I put a breakpoint on OnMouseMove it is called when I click. Not sure why but I need to make a camera controlled by the user and I need to move the camera only when the user holds the left button down and moves the mouse. How could I do that? Also what does “bubbled” mean in terms of events?

Thanks.

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