touch_observer_hud.h 2.8 KB

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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. #ifndef ASH_TOUCH_TOUCH_OBSERVER_HUD_H_
  5. #define ASH_TOUCH_TOUCH_OBSERVER_HUD_H_
  6. #include <stdint.h>
  7. #include <string>
  8. #include "ash/ash_export.h"
  9. #include "ash/display/window_tree_host_manager.h"
  10. #include "ui/display/display_observer.h"
  11. #include "ui/display/manager/display_configurator.h"
  12. #include "ui/events/event_handler.h"
  13. #include "ui/views/widget/widget_observer.h"
  14. namespace views {
  15. class Widget;
  16. }
  17. namespace ash {
  18. // An event filter which handles system level gesture events. Objects of this
  19. // class manage their own lifetime. TODO(estade): find a more descriptive name
  20. // for this class that aligns with its subclasses (or consider using composition
  21. // over inheritance).
  22. class ASH_EXPORT TouchObserverHud
  23. : public ui::EventHandler,
  24. public views::WidgetObserver,
  25. public display::DisplayObserver,
  26. public display::DisplayConfigurator::Observer,
  27. public WindowTreeHostManager::Observer {
  28. public:
  29. TouchObserverHud(const TouchObserverHud&) = delete;
  30. TouchObserverHud& operator=(const TouchObserverHud&) = delete;
  31. // Called to clear touch points and traces from the screen.
  32. virtual void Clear() = 0;
  33. // Removes the HUD from the screen.
  34. void Remove();
  35. int64_t display_id() const { return display_id_; }
  36. protected:
  37. // |widget_name| is set on Widget::InitParams::name, and is used purely for
  38. // debugging.
  39. TouchObserverHud(aura::Window* initial_root, const std::string& widget_name);
  40. ~TouchObserverHud() override;
  41. virtual void SetHudForRootWindowController(
  42. RootWindowController* controller) = 0;
  43. virtual void UnsetHudForRootWindowController(
  44. RootWindowController* controller) = 0;
  45. views::Widget* widget() { return widget_; }
  46. // ui::EventHandler:
  47. void OnTouchEvent(ui::TouchEvent* event) override = 0;
  48. // views::WidgetObserver:
  49. void OnWidgetDestroying(views::Widget* widget) override;
  50. // display::DisplayObserver:
  51. void OnDisplayRemoved(const display::Display& old_display) override;
  52. void OnDisplayMetricsChanged(const display::Display& display,
  53. uint32_t metrics) override;
  54. // display::DisplayConfigurator::Observer:
  55. void OnDisplayModeChanged(
  56. const display::DisplayConfigurator::DisplayStateList& outputs) override;
  57. // WindowTreeHostManager::Observer:
  58. void OnDisplaysInitialized() override;
  59. void OnDisplayConfigurationChanging() override;
  60. void OnDisplayConfigurationChanged() override;
  61. private:
  62. friend class TouchHudTestBase;
  63. const int64_t display_id_;
  64. aura::Window* root_window_;
  65. views::Widget* widget_;
  66. display::ScopedDisplayObserver display_observer_{this};
  67. };
  68. } // namespace ash
  69. #endif // ASH_TOUCH_TOUCH_OBSERVER_HUD_H_