io/router,widget: give every key.InputOp a chance to process events

If the currently focused handler don't want the key event, try every
other handler, from top to bottom. This change requires widgets to
only react when focused.

Fixes: https://todo.sr.ht/~eliasnaur/gio/406
Signed-off-by: Elias Naur <mail@eliasnaur.com>

io/router/key_test.go

@@ -333,32 +333,16 @@ func TestKeyRouting(t *testing.T) {
 	key.InputOp{Tag: &handlers[2], Keys: "A"}.Add(ops)
 	cl1.Pop()
 
-	key.FocusOp{Tag: &handlers[2]}.Add(ops)
-
 	r.Frame(ops)
 
 	A, B := key.Event{Name: "A"}, key.Event{Name: "B"}
 	r.Queue(A, B)
 
-	assertKeyEvent(t, r.Events(&handlers[2]), true, A)
+	assertKeyEvent(t, r.Events(&handlers[2]), false, A)
 	assertKeyEvent(t, r.Events(&handlers[1]), false, B)
 	assertKeyEvent(t, r.Events(&handlers[0]), false)
 }
 
-func TestTopLevelInputOp(t *testing.T) {
-	h := new(int)
-	ops := new(op.Ops)
-	r := new(Router)
-
-	key.InputOp{Tag: h, Keys: "A"}.Add(ops)
-	r.Frame(ops)
-
-	A := key.Event{Name: "A"}
-	r.Queue(A)
-
-	assertKeyEvent(t, r.Events(h), false, A)
-}
-
 func assertKeyEvent(t *testing.T, events []event.Event, expected bool, expectedInputs ...event.Event) {
 	t.Helper()
 	var evtFocus int

io/router/router.go

@@ -182,25 +182,12 @@ func rangeNorm(r key.Range) key.Range {
 
 func (q *Router) queueKeyEvent(e key.Event) {
 	kq := &q.key.queue
-	f := q.key.queue.focus
-	a := 0 // Root area
-	if f != nil {
-		if kq.Accepts(f, e) {
-			q.handlers.Add(f, e)
-			return
-		}
-		a = kq.AreaFor(f)
+	if f := q.key.queue.focus; f != nil && kq.Accepts(f, e) {
+		q.handlers.Add(f, e)
+		return
 	}
 	pq := &q.pointer.queue
 	idx := len(pq.hitTree) - 1
-	// Locate first potential receiver.
-	for idx != -1 {
-		n := &pq.hitTree[idx]
-		if n.area == a {
-			break
-		}
-		idx--
-	}
 	for idx != -1 {
 		n := &pq.hitTree[idx]
 		idx = n.next

widget/button.go

@@ -166,7 +166,7 @@ func (b *Clickable) update(gtx layout.Context) {
 		case key.FocusEvent:
 			b.focused = e.Focus
 		case key.Event:
-			if e.State != key.Release {
+			if !b.focused || e.State != key.Release {
 				break
 			}
 			if e.Name != key.NameReturn && e.Name != key.NameSpace {

widget/enum.go

@@ -98,7 +98,7 @@ func (e *Enum) Layout(gtx layout.Context, k string, content layout.Widget) layou
 				e.focused = false
 			}
 		case key.Event:
-			if ev.State != key.Release {
+			if !e.focused || ev.State != key.Release {
 				break
 			}
 			if ev.Name != key.NameEnter && ev.Name != key.NameSpace {