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      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 ASH_TOUCH_TOUCH_OBSERVER_HUD_H_
      6 #define ASH_TOUCH_TOUCH_OBSERVER_HUD_H_
      7 
      8 #include "ash/ash_export.h"
      9 #include "ash/display/display_controller.h"
     10 #include "ui/events/event_handler.h"
     11 #include "ui/gfx/display_observer.h"
     12 #include "ui/views/widget/widget_observer.h"
     13 
     14 #if defined(OS_CHROMEOS)
     15 #include "ui/display/chromeos/display_configurator.h"
     16 #endif  // defined(OS_CHROMEOS)
     17 
     18 namespace views {
     19 class Widget;
     20 }
     21 
     22 namespace ash {
     23 
     24 // An event filter which handles system level gesture events. Objects of this
     25 // class manage their own lifetime.
     26 class ASH_EXPORT TouchObserverHUD : public ui::EventHandler,
     27                                     public views::WidgetObserver,
     28                                     public gfx::DisplayObserver,
     29 #if defined(OS_CHROMEOS)
     30                                     public ui::DisplayConfigurator::Observer,
     31 #endif  // defined(OS_CHROMEOS)
     32                                     public DisplayController::Observer {
     33  public:
     34   // Called to clear touch points and traces from the screen. Default
     35   // implementation does nothing. Sub-classes should implement appropriately.
     36   virtual void Clear();
     37 
     38   // Removes the HUD from the screen.
     39   void Remove();
     40 
     41   int64 display_id() const { return display_id_; }
     42 
     43  protected:
     44   explicit TouchObserverHUD(aura::Window* initial_root);
     45 
     46   virtual ~TouchObserverHUD();
     47 
     48   virtual void SetHudForRootWindowController(
     49       RootWindowController* controller) = 0;
     50   virtual void UnsetHudForRootWindowController(
     51       RootWindowController* controller) = 0;
     52 
     53   views::Widget* widget() { return widget_; }
     54 
     55   // Overriden from ui::EventHandler.
     56   virtual void OnTouchEvent(ui::TouchEvent* event) OVERRIDE;
     57 
     58   // Overridden from views::WidgetObserver.
     59   virtual void OnWidgetDestroying(views::Widget* widget) OVERRIDE;
     60 
     61   // Overridden from gfx::DisplayObserver.
     62   virtual void OnDisplayAdded(const gfx::Display& new_display) OVERRIDE;
     63   virtual void OnDisplayRemoved(const gfx::Display& old_display) OVERRIDE;
     64   virtual void OnDisplayMetricsChanged(const gfx::Display& display,
     65                                        uint32_t metrics) OVERRIDE;
     66 
     67 #if defined(OS_CHROMEOS)
     68   // Overriden from ui::DisplayConfigurator::Observer.
     69   virtual void OnDisplayModeChanged(
     70       const ui::DisplayConfigurator::DisplayStateList& outputs) OVERRIDE;
     71 #endif  // defined(OS_CHROMEOS)
     72 
     73   // Overriden form DisplayController::Observer.
     74   virtual void OnDisplaysInitialized() OVERRIDE;
     75   virtual void OnDisplayConfigurationChanging() OVERRIDE;
     76   virtual void OnDisplayConfigurationChanged() OVERRIDE;
     77 
     78  private:
     79   friend class TouchHudTestBase;
     80 
     81   const int64 display_id_;
     82   aura::Window* root_window_;
     83 
     84   views::Widget* widget_;
     85 
     86   DISALLOW_COPY_AND_ASSIGN(TouchObserverHUD);
     87 };
     88 
     89 }  // namespace ash
     90 
     91 #endif  // ASH_TOUCH_TOUCH_OBSERVER_HUD_H_
     92