Home | History | Annotate | Download | only in aura 
      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/message_loop/message_loop.h"
     10 #include "base/observer_list.h"
     11 #include "ui/aura/aura_export.h"
     12 #include "ui/base/events/event_handler.h"
     13 #include "ui/base/events/event_target.h"
     14 #include "ui/gfx/point.h"
     15 
     16 #if defined(USE_X11)
     17 #include "ui/aura/device_list_updater_aurax11.h"
     18 #endif
     19 
     20 namespace aura {
     21 class EnvObserver;
     22 class RootWindow;
     23 class Window;
     24 
     25 #if !defined(USE_X11)
     26 // Creates a platform-specific native event dispatcher.
     27 base::MessageLoop::Dispatcher* CreateDispatcher();
     28 #endif
     29 
     30 // A singleton object that tracks general state within Aura.
     31 // TODO(beng): manage RootWindows.
     32 class AURA_EXPORT Env : public ui::EventTarget {
     33  public:
     34   Env();
     35   virtual ~Env();
     36 
     37   static Env* GetInstance();
     38   static void DeleteInstance();
     39 
     40   void AddObserver(EnvObserver* observer);
     41   void RemoveObserver(EnvObserver* observer);
     42 
     43   bool is_mouse_button_down() const { return mouse_button_flags_ != 0; }
     44   void set_mouse_button_flags(int mouse_button_flags) {
     45     mouse_button_flags_ = mouse_button_flags;
     46   }
     47 
     48   // Gets/sets the last mouse location seen in a mouse event in the screen
     49   // coordinates.
     50   const gfx::Point& last_mouse_location() const { return last_mouse_location_; }
     51   void set_last_mouse_location(const gfx::Point& last_mouse_location) {
     52     last_mouse_location_ = last_mouse_location;
     53   }
     54 
     55   // Whether any touch device is currently down.
     56   bool is_touch_down() const { return is_touch_down_; }
     57   void set_touch_down(bool value) { is_touch_down_ = value; }
     58 
     59 
     60   // Returns the native event dispatcher. The result should only be passed to
     61   // base::RunLoop(dispatcher), or used to dispatch an event by
     62   // |Dispatch(const NativeEvent&)| on it. It must never be stored.
     63 #if !defined(OS_MACOSX)
     64   base::MessageLoop::Dispatcher* GetDispatcher();
     65 #endif
     66 
     67   // Invoked by RootWindow when its host is activated.
     68   void RootWindowActivated(RootWindow* root_window);
     69 
     70  private:
     71   friend class Window;
     72   friend class RootWindow;
     73 
     74   void Init();
     75 
     76   // Called by the Window when it is initialized. Notifies observers.
     77   void NotifyWindowInitialized(Window* window);
     78 
     79   // Called by the RootWindow when it is initialized. Notifies observers.
     80   void NotifyRootWindowInitialized(RootWindow* root_window);
     81 
     82   // Overridden from ui::EventTarget:
     83   virtual bool CanAcceptEvent(const ui::Event& event) OVERRIDE;
     84   virtual ui::EventTarget* GetParentTarget() OVERRIDE;
     85 
     86   ObserverList<EnvObserver> observers_;
     87 #if !defined(USE_X11)
     88   scoped_ptr<base::MessageLoop::Dispatcher> dispatcher_;
     89 #endif
     90 
     91   static Env* instance_;
     92   int mouse_button_flags_;
     93   // Location of last mouse event, in screen coordinates.
     94   gfx::Point last_mouse_location_;
     95   bool is_touch_down_;
     96 
     97 #if defined(USE_X11)
     98   DeviceListUpdaterAuraX11 device_list_updater_aurax11_;
     99 #endif
    100 
    101   DISALLOW_COPY_AND_ASSIGN(Env);
    102 };
    103 
    104 }  // namespace aura
    105 
    106 #endif  // UI_AURA_ENV_H_
    107