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.
4
5#include "ui/views/view_targeter.h"
6
7#include "ui/events/event_target.h"
8#include "ui/views/focus/focus_manager.h"
9#include "ui/views/view.h"
10#include "ui/views/view_targeter_delegate.h"
11
12namespace views {
13
14ViewTargeter::ViewTargeter(ViewTargeterDelegate* delegate)
15    : delegate_(delegate) {
16  DCHECK(delegate_);
17}
18
19ViewTargeter::~ViewTargeter() {}
20
21bool ViewTargeter::DoesIntersectRect(const View* target,
22                                     const gfx::Rect& rect) const {
23  return delegate_->DoesIntersectRect(target, rect);
24}
25
26View* ViewTargeter::TargetForRect(View* root, const gfx::Rect& rect) const {
27  return delegate_->TargetForRect(root, rect);
28}
29
30ui::EventTarget* ViewTargeter::FindTargetForEvent(ui::EventTarget* root,
31                                                  ui::Event* event) {
32  View* view = static_cast<View*>(root);
33
34  if (event->IsKeyEvent())
35    return FindTargetForKeyEvent(view, *static_cast<ui::KeyEvent*>(event));
36
37  if (event->IsScrollEvent()) {
38    return FindTargetForScrollEvent(view,
39                                    *static_cast<ui::ScrollEvent*>(event));
40  }
41
42  if (event->IsGestureEvent()) {
43    ui::GestureEvent* gesture = event->AsGestureEvent();
44    View* gesture_target = FindTargetForGestureEvent(view, *gesture);
45    root->ConvertEventToTarget(gesture_target, gesture);
46    return gesture_target;
47  }
48
49  NOTREACHED() << "ViewTargeter does not yet support this event type.";
50  return NULL;
51}
52
53ui::EventTarget* ViewTargeter::FindNextBestTarget(
54    ui::EventTarget* previous_target,
55    ui::Event* event) {
56  if (!previous_target)
57    return NULL;
58
59  if (event->IsGestureEvent()) {
60    ui::GestureEvent* gesture = event->AsGestureEvent();
61    ui::EventTarget* next_target =
62        FindNextBestTargetForGestureEvent(previous_target, *gesture);
63    previous_target->ConvertEventToTarget(next_target, gesture);
64    return next_target;
65  }
66
67  return previous_target->GetParentTarget();
68}
69
70bool ViewTargeter::SubtreeCanAcceptEvent(
71    ui::EventTarget* target,
72    const ui::LocatedEvent& event) const {
73  NOTREACHED();
74  return false;
75}
76
77bool ViewTargeter::EventLocationInsideBounds(
78    ui::EventTarget* target,
79    const ui::LocatedEvent& event) const {
80  NOTREACHED();
81  return false;
82}
83
84View* ViewTargeter::FindTargetForKeyEvent(View* root, const ui::KeyEvent& key) {
85  if (root->GetFocusManager())
86    return root->GetFocusManager()->GetFocusedView();
87  return NULL;
88}
89
90View* ViewTargeter::FindTargetForScrollEvent(View* root,
91                                             const ui::ScrollEvent& scroll) {
92  gfx::Rect rect(scroll.location(), gfx::Size(1, 1));
93  return root->GetEffectiveViewTargeter()->TargetForRect(root, rect);
94}
95
96View* ViewTargeter::FindTargetForGestureEvent(View* root,
97                                              const ui::GestureEvent& gesture) {
98  // TODO(tdanderson): The only code path that performs targeting for gestures
99  //                   uses the ViewTargeter installed on the RootView (i.e.,
100  //                   a RootViewTargeter). Provide a default implementation
101  //                   here if we need to be able to perform gesture targeting
102  //                   starting at an arbitrary node in a Views tree.
103  NOTREACHED();
104  return NULL;
105}
106
107ui::EventTarget* ViewTargeter::FindNextBestTargetForGestureEvent(
108    ui::EventTarget* previous_target,
109    const ui::GestureEvent& gesture) {
110  NOTREACHED();
111  return NULL;
112}
113
114}  // namespace views
115