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 class View; 14 15 // Contains the logic used to determine the View to which an 16 // event should be dispatched. A ViewTargeter (or one of its 17 // derived classes) is installed on a View to specify the 18 // targeting behaviour to be used for the subtree rooted at 19 // that View. 20 class VIEWS_EXPORT ViewTargeter : public ui::EventTargeter { 21 public: 22 ViewTargeter(); 23 virtual ~ViewTargeter(); 24 25 protected: 26 // Returns the location of |event| represented as a rect. If |event| is 27 // a gesture event, its bounding box is returned. Otherwise, a 1x1 rect 28 // having its origin at the location of |event| is returned. 29 gfx::RectF BoundsForEvent(const ui::LocatedEvent& event) const; 30 31 // ui::EventTargeter: 32 virtual ui::EventTarget* FindTargetForEvent(ui::EventTarget* root, 33 ui::Event* event) OVERRIDE; 34 virtual ui::EventTarget* FindNextBestTarget(ui::EventTarget* previous_target, 35 ui::Event* event) OVERRIDE; 36 virtual bool SubtreeCanAcceptEvent( 37 ui::EventTarget* target, 38 const ui::LocatedEvent& event) const OVERRIDE; 39 virtual bool EventLocationInsideBounds( 40 ui::EventTarget* target, 41 const ui::LocatedEvent& event) const OVERRIDE; 42 43 private: 44 View* FindTargetForKeyEvent(View* view, const ui::KeyEvent& key); 45 46 DISALLOW_COPY_AND_ASSIGN(ViewTargeter); 47 }; 48 49 } // namespace views 50 51 #endif // UI_VIEWS_VIEW_TARGETER_H_ 52