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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 #ifndef UI_VIEWS_VIEW_TARGETER_H_ | |
| 6 #define UI_VIEWS_VIEW_TARGETER_H_ | |
| 7 | |
| 8 #include "ui/events/event_targeter.h" | |
| 9 #include "ui/views/views_export.h" | |
| 10 | |
| 11 namespace views { | |
| 12 | |
| 13 namespace internal { | |
| 14 class RootView; | |
| 15 } // namespace internal | |
| 16 | |
| 17 class View; | |
| 18 class ViewTargeterDelegate; | |
| 19 | |
| 20 // A ViewTargeter is installed on a View that wishes to use the custom | |
| 21 // hit-testing or event-targeting behaviour defined by |delegate|. | |
| 22 class VIEWS_EXPORT ViewTargeter : public ui::EventTargeter { | |
| 23 public: | |
| 24 explicit ViewTargeter(ViewTargeterDelegate* delegate); | |
| 25 ~ViewTargeter() override; | |
| 26 | |
| 27 // A call-through to DoesIntersectRect() on |delegate_|. | |
| 28 bool DoesIntersectRect(const View* target, const gfx::Rect& rect) const; | |
| 29 | |
| 30 // A call-through to TargetForRect() on |delegate_|. | |
| 31 View* TargetForRect(View* root, const gfx::Rect& rect) const; | |
| 32 | |
| 33 protected: | |
| 34 // ui::EventTargeter: | |
| 35 ui::EventTarget* FindTargetForEvent(ui::EventTarget* root, | |
| 36 ui::Event* event) override; | |
| 37 ui::EventTarget* FindNextBestTarget(ui::EventTarget* previous_target, | |
| 38 ui::Event* event) override; | |
| 39 bool SubtreeCanAcceptEvent(ui::EventTarget* target, | |
| 40 const ui::LocatedEvent& event) const override; | |
| 41 bool EventLocationInsideBounds(ui::EventTarget* target, | |
| 42 const ui::LocatedEvent& event) const override; | |
| 43 | |
| 44 private: | |
| 45 // TODO(tdanderson): Un-friend RootView once RootView::DispatchGestureEvent() | |
| 46 // has been removed. | |
| 47 friend class internal::RootView; | |
| 48 | |
| 49 View* FindTargetForKeyEvent(View* root, const ui::KeyEvent& key); | |
| 50 View* FindTargetForScrollEvent(View* root, const ui::ScrollEvent& scroll); | |
| 51 | |
| 52 virtual View* FindTargetForGestureEvent(View* root, | |
| 53 const ui::GestureEvent& gesture); | |
| 54 virtual ui::EventTarget* FindNextBestTargetForGestureEvent( | |
| 55 ui::EventTarget* previous_target, | |
| 56 const ui::GestureEvent& gesture); | |
| 57 | |
| 58 // ViewTargeter does not own the |delegate_|, but |delegate_| must | |
| 59 // outlive the targeter. | |
| 60 ViewTargeterDelegate* delegate_; | |
| 61 | |
| 62 DISALLOW_COPY_AND_ASSIGN(ViewTargeter); | |
| 63 }; | |
| 64 | |
| 65 } // namespace views | |
| 66 | |
| 67 #endif // UI_VIEWS_VIEW_TARGETER_H_ | |
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