Class DndCollisions

Namespace

Velvet

Assembly

Velvet.Docs.dll

The built-in collision strategies: RectIntersection, ClosestCenter, and PointerWithin. All are pure functions over a DndCollisionQuery (no panel access), returning a single winning id or null rather than a ranked collision list — the context only ever consumes the first collision anyway, and the delegate's return can be extended compatibly later. None of them consider occlusion; all are rect-based only.

public static class DndCollisions

Inheritance

object

DndCollisions

Fields

ClosestCenter

Droppable whose center is nearest ActiveRect's center wins — the forgiving strategy sortable lists and coarse grids want. Every candidate collides by definition, so this never returns null while any candidate exists.

PointerWithin

Droppable rect containing the pointer wins; on nesting, the innermost (smallest area) container takes it.

RectIntersection

Largest ActiveRect-droppable intersection area wins. Ties resolve by registration order (first candidate wins).