touch_hud_renderer.h 1.4 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657
  1. // Copyright 2016 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_HUD_RENDERER_H_
  5. #define ASH_TOUCH_TOUCH_HUD_RENDERER_H_
  6. #include <map>
  7. #include "ash/ash_export.h"
  8. #include "ui/views/widget/widget_observer.h"
  9. namespace ui {
  10. class TouchEvent;
  11. }
  12. namespace views {
  13. class Widget;
  14. }
  15. namespace ash {
  16. class TouchPointView;
  17. // Handles touch events to draw out touch points for TouchHudProjection
  18. // (--show-taps).
  19. class ASH_EXPORT TouchHudRenderer : public views::WidgetObserver {
  20. public:
  21. explicit TouchHudRenderer(views::Widget* parent_widget);
  22. TouchHudRenderer(const TouchHudRenderer&) = delete;
  23. TouchHudRenderer& operator=(const TouchHudRenderer&) = delete;
  24. ~TouchHudRenderer() override;
  25. // Called to clear touch points and traces from the screen.
  26. void Clear();
  27. // Receives a touch event and draws its touch point.
  28. void HandleTouchEvent(const ui::TouchEvent& event);
  29. // views::WidgetObserver:
  30. void OnWidgetDestroying(views::Widget* widget) override;
  31. private:
  32. friend class TouchHudProjectionTest;
  33. // The parent widget that all touch points would be drawn in.
  34. views::Widget* parent_widget_;
  35. // A map of touch ids to TouchPointView.
  36. std::map<int, TouchPointView*> points_;
  37. };
  38. } // namespace ash
  39. #endif // ASH_TOUCH_TOUCH_HUD_RENDERER_H_