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| 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 |
| 5 #ifndef ASH_COMMON_SYSTEM_CHROMEOS_PALETTE_TOOLS_LASER_POINTER_POINTS_H_ |
| 6 #define ASH_COMMON_SYSTEM_CHROMEOS_PALETTE_TOOLS_LASER_POINTER_POINTS_H_ |
| 7 |
| 8 #include <deque> |
| 9 #include <memory> |
| 10 |
| 11 #include "ash/ash_export.h" |
| 12 #include "base/time/time.h" |
| 13 #include "ui/gfx/geometry/point.h" |
| 14 #include "ui/gfx/geometry/rect.h" |
| 15 |
| 16 namespace ash { |
| 17 |
| 18 // LaserPointerPoints is a helper class used for displaying the palette tool |
| 19 // laser pointer. It keeps track of the points needed to render the laser |
| 20 // pointer and its tail. |
| 21 class ASH_EXPORT LaserPointerPoints { |
| 22 public: |
| 23 // Struct to describe each point. |
| 24 struct LaserPoint { |
| 25 gfx::Point location; |
| 26 base::Time creation_time; |
| 27 }; |
| 28 |
| 29 // Constructor with a parameter to choose the fade out time of the points in |
| 30 // the collection. |
| 31 explicit LaserPointerPoints(base::TimeDelta life_duration); |
| 32 ~LaserPointerPoints(); |
| 33 |
| 34 // Adds a point. Automatically clears points that are too old. |
| 35 void AddPoint(const gfx::Point& point); |
| 36 // Removes all points. |
| 37 void Clear(); |
| 38 // Gets the bounding box of the points. |
| 39 gfx::Rect GetBoundingBox(); |
| 40 // Returns the oldest point in the collection. |
| 41 LaserPoint GetOldest() const; |
| 42 // Returns the newest point in the collection. |
| 43 LaserPoint GetNewest() const; |
| 44 // Returns the number of points in the collection. |
| 45 int GetNumberOfPoints() const; |
| 46 // Whether there are any points or not. |
| 47 bool IsEmpty() const; |
| 48 // Expose the collection so callers can work with the points. |
| 49 const std::deque<LaserPoint>& laser_points(); |
| 50 |
| 51 private: |
| 52 friend class LaserPointerPointsTestApi; |
| 53 |
| 54 void ClearOldPoints(); |
| 55 |
| 56 base::TimeDelta life_duration_; |
| 57 std::deque<LaserPoint> points_; |
| 58 |
| 59 DISALLOW_COPY_AND_ASSIGN(LaserPointerPoints); |
| 60 }; |
| 61 |
| 62 } // namespace ash |
| 63 |
| 64 #endif // ASH_COMMON_SYSTEM_CHROMEOS_PALETTE_TOOLS_LASER_POINTER_POINTS_H_ |
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