Method Deliver

io/input/pointer.go:682–715

Deliver is like Push, but delivers an event to a particular area.

(handlers map[event.Tag]*handler, areaIdx int, e pointer.Event)

// Deliver is like Push, but delivers an event to a particular area.
func (q *pointerQueue) Deliver(handlers map[event.Tag]*handler, areaIdx int, e pointer.Event) []taggedEvent {
	scroll := e.Scroll
	idx := len(q.hitTree) - 1
	// Locate first potential receiver.
	for idx != -1 {
		n := &q.hitTree[idx]
		if n.area == areaIdx {
			break
		}
		idx--
	}
	var evts []taggedEvent
	for idx != -1 {
		n := &q.hitTree[idx]
		idx = n.next
		h, ok := handlers[n.tag]
		if !ok || !h.filter.pointer.Matches(e) {
			continue
		}
		e := e
		if e.Kind == pointer.Scroll {
			if scroll == (f32.Point{}) {
				break
			}
			scroll, e.Scroll = h.filter.pointer.clampScroll(scroll)
		}
		e.Position = q.invTransform(h.pointer.areaPlusOne-1, e.Position)
		evts = append(evts, taggedEvent{tag: n.tag, event: e})
		if e.Kind != pointer.Scroll {
			break
		}
	}
	return evts
}

// SemanticArea returns the sematic content for area, and its parent area.
func (q *pointerQueue) SemanticArea(areaIdx int) (semanticContent, int) {