Add PointerCaptureMap#24396
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Allows entities to lock a pointer's hover state. While captured, generate_hovermap reports only the capturing entity as hovered, even if the pointer drifts outside its bounding box. Useful for drag interactions like sliders where the pointer can move faster than the widget. Includes unit tests and draggable_slider example. Closes bevyengine#21754 Co-authored-by: Rodrigo Gomes <rodrigo.c.gomes@tecnico.ulisboa.pt> Signed-off-by: João Conceição <joao.conceicao@tecnico.ulisboa.pt>
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Objective
Fixes #21754
When dragging widgets like sliders, the pointer often moves faster than the widget can follow. It drifts outside the bounding box while the button is held, breaking the interaction.
Solution
Added
PointerCaptureMapresource to lock a pointer's hover state to an entity. Thegenerate_hovermapsystem now applies captures after computing the normal hover map, so captured pointers only report the capturing entity.Public API:
capture(pointer, entity, hit)— lock pointerrelease(pointer)— unlockget(pointer)— query captureis_captured(pointer)— check statusIncludes unit tests and a
draggable_sliderexample demonstrating the feature.