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/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   ~TouchObserverHUD() override;
  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   void OnTouchEvent(ui::TouchEvent* event) override;
  57
  58   // Overridden from views::WidgetObserver.
  59   void OnWidgetDestroying(views::Widget* widget) override;
  60
  61   // Overridden from gfx::DisplayObserver.
  62   void OnDisplayAdded(const gfx::Display& new_display) override;
  63   void OnDisplayRemoved(const gfx::Display& old_display) override;
  64   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   void OnDisplaysInitialized() override;
  75   void OnDisplayConfigurationChanging() override;
  76   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_