Pointer Focus Registration Code Repack Site

is the exclusive right of a single UI element to receive input events originating from a pointing device (mouse, pen, touch). Unlike keyboard focus (which can be transferred via Tab ), pointer focus is transient, aggressive, and inherently tied to geometry and z-order.

# 3. Notify old focus (asynchronous, allow cleanup) if old_focus and old_focus != candidate: old_focus.on_pointer_focus_lost(event) pointer focus registration code

occurs when pointer focus registers and releases multiple times within a single frame—usually due to overlapping transparent hitboxes or async layout recalculations. is the exclusive right of a single UI

Be the former.

def register_pointer_focus(candidate, event): # 1. Pre-condition: candidate is alive and hittable assert candidate.is_alive() assert candidate.hit_test(event.x, event.y) == True # 2. Invalidate current focus without releasing events yet old_focus = system.pointer_focus system.pointer_focus = None Notify old focus (asynchronous, allow cleanup) if old_focus

You click a button. It highlights. You type, and text appears. It feels instantaneous, obvious, even banal.