1 // Copyright (c) 2012 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_AURA_CLIENT_EVENT_CLIENT_H_ 6 #define UI_AURA_CLIENT_EVENT_CLIENT_H_ 7 8 #include "ui/aura/aura_export.h" 9 #include "ui/aura/window.h" 10 11 namespace aura { 12 13 class Event; 14 class RootWindow; 15 16 namespace client { 17 18 // An interface implemented by an object that alters event processing. 19 class AURA_EXPORT EventClient { 20 public: 21 // Returns true if events can be processed by |window| or any of its children. 22 virtual bool CanProcessEventsWithinSubtree(const Window* window) const = 0; 23 24 // Returns the top level EventTarget for the current environment. 25 virtual ui::EventTarget* GetToplevelEventTarget() = 0; 26 27 protected: 28 virtual ~EventClient() {} 29 }; 30 31 // Sets/Gets the event client on the RootWindow. 32 AURA_EXPORT void SetEventClient(RootWindow* root_window, EventClient* client); 33 AURA_EXPORT EventClient* GetEventClient(const RootWindow* root_window); 34 35 } // namespace clients 36 } // namespace aura 37 38 #endif // UI_AURA_CLIENT_EVENT_CLIENT_H_ 39
