io/pointer,io/router: make PassOp apply to InputOps, not areas

We're about to make clip.Ops act as pointer areas, in which case we'd
like to contain the effect of PassOp to just pointer InputOps.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

io/router/pointer_test.go

@@ -686,6 +686,53 @@ func TestCursorNameOp(t *testing.T) {
 	}
 }
 
+func TestPassOp(t *testing.T) {
+	var ops op.Ops
+
+	h1, h2, h3, h4 := new(int), new(int), new(int), new(int)
+	area := pointer.Rect(image.Rect(0, 0, 100, 100))
+	root := area.Push(&ops)
+	pointer.InputOp{Tag: h1, Types: pointer.Press}.Add(&ops)
+	child1 := area.Push(&ops)
+	pointer.InputOp{Tag: h2, Types: pointer.Press}.Add(&ops)
+	child1.Pop()
+	child2 := area.Push(&ops)
+	pass := pointer.PassOp{}.Push(&ops)
+	pointer.InputOp{Tag: h3, Types: pointer.Press}.Add(&ops)
+	pointer.InputOp{Tag: h4, Types: pointer.Press}.Add(&ops)
+	pass.Pop()
+	child2.Pop()
+	root.Pop()
+
+	var r Router
+	r.Frame(&ops)
+	r.Queue(
+		pointer.Event{
+			Type: pointer.Press,
+		},
+	)
+	assertEventSequence(t, r.Events(h1), pointer.Cancel, pointer.Press)
+	assertEventSequence(t, r.Events(h2), pointer.Cancel, pointer.Press)
+	assertEventSequence(t, r.Events(h3), pointer.Cancel, pointer.Press)
+	assertEventSequence(t, r.Events(h4), pointer.Cancel, pointer.Press)
+}
+
+func TestAreaPassthrough(t *testing.T) {
+	var ops op.Ops
+
+	h := new(int)
+	pointer.InputOp{Tag: h, Types: pointer.Press}.Add(&ops)
+	pointer.Rect(image.Rect(0, 0, 100, 100)).Push(&ops).Pop()
+	var r Router
+	r.Frame(&ops)
+	r.Queue(
+		pointer.Event{
+			Type: pointer.Press,
+		},
+	)
+	assertEventSequence(t, r.Events(h), pointer.Cancel, pointer.Press)
+}
+
 // addPointerHandler adds a pointer.InputOp for the tag in a
 // rectangular area.
 func addPointerHandler(ops *op.Ops, tag event.Tag, area image.Rectangle) {