1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "ui/views/widget/root_view_targeter.h"
7 #include "ui/views/view.h"
8 #include "ui/views/view_targeter_delegate.h"
9 #include "ui/views/views_switches.h"
10 #include "ui/views/widget/root_view.h"
11 #include "ui/views/widget/widget.h"
15 RootViewTargeter::RootViewTargeter(ViewTargeterDelegate
* delegate
,
16 internal::RootView
* root_view
)
17 : ViewTargeter(delegate
), root_view_(root_view
) {
20 RootViewTargeter::~RootViewTargeter() {
23 View
* RootViewTargeter::FindTargetForGestureEvent(
25 const ui::GestureEvent
& gesture
) {
26 CHECK_EQ(root
, root_view_
);
28 // Return the default gesture handler if one is already set.
29 if (root_view_
->gesture_handler_
) {
30 CHECK(!root_view_
->allow_gesture_event_retargeting_
);
31 return root_view_
->gesture_handler_
;
34 // If rect-based targeting is enabled, use the gesture's bounding box to
35 // determine the target. Otherwise use the center point of the gesture's
36 // bounding box to determine the target.
37 gfx::Rect
rect(gesture
.location(), gfx::Size(1, 1));
38 if (views::switches::IsRectBasedTargetingEnabled() &&
39 !gesture
.details().bounding_box().IsEmpty()) {
40 // TODO(tdanderson): Pass in the bounding box to GetEventHandlerForRect()
41 // once crbug.com/313392 is resolved.
42 rect
.set_size(gesture
.details().bounding_box().size());
43 rect
.Offset(-rect
.width() / 2, -rect
.height() / 2);
46 return root
->GetEffectiveViewTargeter()->TargetForRect(root
, rect
);
49 ui::EventTarget
* RootViewTargeter::FindNextBestTargetForGestureEvent(
50 ui::EventTarget
* previous_target
,
51 const ui::GestureEvent
& gesture
) {
52 // GESTURE_SCROLL_BEGIN events are always permitted to be re-targeted, even
53 // if |allow_gesture_event_retargeting_| is false.
54 if (!root_view_
->allow_gesture_event_retargeting_
&&
55 gesture
.type() != ui::ET_GESTURE_SCROLL_BEGIN
) {
59 // If |gesture_handler_| is NULL, it is either because the view was removed
60 // from the tree by the previous dispatch of |gesture| or because |gesture| is
61 // the GESTURE_END event corresponding to the removal of the last touch
62 // point. In either case, no further re-targeting of |gesture| should be
64 if (!root_view_
->gesture_handler_
)
67 return previous_target
->GetParentTarget();