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_ENV_H_ 6 #define UI_AURA_ENV_H_ 7 8 #include "base/memory/scoped_ptr.h" 9 #include "base/observer_list.h" 10 #include "base/supports_user_data.h" 11 #include "ui/aura/aura_export.h" 12 #include "ui/events/event_handler.h" 13 #include "ui/events/event_target.h" 14 #include "ui/gfx/point.h" 15 16 namespace ui { 17 class ContextFactory; 18 class PlatformEventSource; 19 } 20 namespace aura { 21 22 namespace test { 23 class EnvTestHelper; 24 } 25 26 class EnvObserver; 27 class InputStateLookup; 28 class Window; 29 class WindowTreeHost; 30 31 // A singleton object that tracks general state within Aura. 32 class AURA_EXPORT Env : public ui::EventTarget, public base::SupportsUserData { 33 public: 34 // Creates the single Env instance (if it hasn't been created yet). If 35 // |create_event_source| is true a PlatformEventSource is created. 36 // TODO(sky): nuke |create_event_source|. Only necessary while mojo's 37 // nativeviewportservice lives in the same process as the viewmanager. 38 static void CreateInstance(bool create_event_source); 39 static Env* GetInstance(); 40 static void DeleteInstance(); 41 42 void AddObserver(EnvObserver* observer); 43 void RemoveObserver(EnvObserver* observer); 44 mouse_button_flags()45 const int mouse_button_flags() const { return mouse_button_flags_; } set_mouse_button_flags(int mouse_button_flags)46 void set_mouse_button_flags(int mouse_button_flags) { 47 mouse_button_flags_ = mouse_button_flags; 48 } 49 // Returns true if a mouse button is down. This may query the native OS, 50 // otherwise it uses |mouse_button_flags_|. 51 bool IsMouseButtonDown() const; 52 53 // Gets/sets the last mouse location seen in a mouse event in the screen 54 // coordinates. last_mouse_location()55 const gfx::Point& last_mouse_location() const { return last_mouse_location_; } set_last_mouse_location(const gfx::Point & last_mouse_location)56 void set_last_mouse_location(const gfx::Point& last_mouse_location) { 57 last_mouse_location_ = last_mouse_location; 58 } 59 60 // Whether any touch device is currently down. is_touch_down()61 bool is_touch_down() const { return is_touch_down_; } set_touch_down(bool value)62 void set_touch_down(bool value) { is_touch_down_ = value; } 63 set_context_factory(ui::ContextFactory * context_factory)64 void set_context_factory(ui::ContextFactory* context_factory) { 65 context_factory_ = context_factory; 66 } context_factory()67 ui::ContextFactory* context_factory() { return context_factory_; } 68 69 private: 70 friend class test::EnvTestHelper; 71 friend class Window; 72 friend class WindowTreeHost; 73 74 Env(); 75 virtual ~Env(); 76 77 // See description of CreateInstance() for deatils of |create_event_source|. 78 void Init(bool create_event_source); 79 80 // Called by the Window when it is initialized. Notifies observers. 81 void NotifyWindowInitialized(Window* window); 82 83 // Called by the WindowTreeHost when it is initialized. Notifies observers. 84 void NotifyHostInitialized(WindowTreeHost* host); 85 86 // Invoked by WindowTreeHost when it is activated. Notifies observers. 87 void NotifyHostActivated(WindowTreeHost* host); 88 89 // Overridden from ui::EventTarget: 90 virtual bool CanAcceptEvent(const ui::Event& event) OVERRIDE; 91 virtual ui::EventTarget* GetParentTarget() OVERRIDE; 92 virtual scoped_ptr<ui::EventTargetIterator> GetChildIterator() const OVERRIDE; 93 virtual ui::EventTargeter* GetEventTargeter() OVERRIDE; 94 95 ObserverList<EnvObserver> observers_; 96 97 int mouse_button_flags_; 98 // Location of last mouse event, in screen coordinates. 99 gfx::Point last_mouse_location_; 100 bool is_touch_down_; 101 102 scoped_ptr<InputStateLookup> input_state_lookup_; 103 scoped_ptr<ui::PlatformEventSource> event_source_; 104 105 ui::ContextFactory* context_factory_; 106 107 DISALLOW_COPY_AND_ASSIGN(Env); 108 }; 109 110 } // namespace aura 111 112 #endif // UI_AURA_ENV_H_ 113