ash/touch/touch_observer_hud.h

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