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| 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 | |
| 12 namespace views { | |
| 13 | |
| 14 ViewTargeter::ViewTargeter(ViewTargeterDelegate* delegate) | |
| 15 : delegate_(delegate) { | |
| 16 DCHECK(delegate_); | |
| 17 } | |
| 18 | |
| 19 ViewTargeter::~ViewTargeter() {} | |
| 20 | |
| 21 bool ViewTargeter::DoesIntersectRect(const View* target, | |
| 22 const gfx::Rect& rect) const { | |
| 23 return delegate_->DoesIntersectRect(target, rect); | |
| 24 } | |
| 25 | |
| 26 View* ViewTargeter::TargetForRect(View* root, const gfx::Rect& rect) const { | |
| 27 return delegate_->TargetForRect(root, rect); | |
| 28 } | |
| 29 | |
| 30 ui::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 | |
| 53 ui::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 | |
| 70 bool ViewTargeter::SubtreeCanAcceptEvent( | |
| 71 ui::EventTarget* target, | |
| 72 const ui::LocatedEvent& event) const { | |
| 73 NOTREACHED(); | |
| 74 return false; | |
| 75 } | |
| 76 | |
| 77 bool ViewTargeter::EventLocationInsideBounds( | |
| 78 ui::EventTarget* target, | |
| 79 const ui::LocatedEvent& event) const { | |
| 80 NOTREACHED(); | |
| 81 return false; | |
| 82 } | |
| 83 | |
| 84 View* ViewTargeter::FindTargetForKeyEvent(View* root, const ui::KeyEvent& key) { | |
| 85 if (root->GetFocusManager()) | |
| 86 return root->GetFocusManager()->GetFocusedView(); | |
| 87 return NULL; | |
| 88 } | |
| 89 | |
| 90 View* 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 | |
| 96 View* 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 | |
| 107 ui::EventTarget* ViewTargeter::FindNextBestTargetForGestureEvent( | |
| 108 ui::EventTarget* previous_target, | |
| 109 const ui::GestureEvent& gesture) { | |
| 110 NOTREACHED(); | |
| 111 return NULL; | |
| 112 } | |
| 113 | |
| 114 } // namespace views | |
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