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- // Copyright 2016 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #ifndef ASH_FAST_INK_FAST_INK_POINTS_H_
- #define ASH_FAST_INK_FAST_INK_POINTS_H_
- #include "ash/ash_export.h"
- #include "base/containers/circular_deque.h"
- #include "base/time/time.h"
- #include "third_party/skia/include/core/SkColor.h"
- #include "ui/gfx/geometry/rect.h"
- #include "ui/gfx/geometry/rect_f.h"
- namespace fast_ink {
- // FastInkPoints is a helper class used for displaying low-latency palette
- // tools. It contains a collection of points representing one or more
- // contiguous trajectory segments.
- class ASH_EXPORT FastInkPoints {
- public:
- static const SkColor kDefaultColor;
- // Struct to describe each point.
- struct FastInkPoint {
- gfx::PointF location;
- base::TimeTicks time;
- SkColor color = kDefaultColor;
- bool gap_after = false; // True when there is a gap after this point.
- };
- // Constructor with a parameter to choose the fade out time of the points in
- // the collection. Zero means no fadeout.
- explicit FastInkPoints(base::TimeDelta life_duration);
- FastInkPoints(const FastInkPoints&) = delete;
- FastInkPoints& operator=(const FastInkPoints&) = delete;
- ~FastInkPoints();
- // Adds a point.
- void AddPoint(const gfx::PointF& point, const base::TimeTicks& time);
- void AddPoint(const gfx::PointF& point,
- const base::TimeTicks& time,
- SkColor color);
- // Adds a gap after the most recent point. This is useful for multi-stroke
- // gesture handling (e.g. strokes going over the bezel).
- void AddGap();
- // Updates the collection latest time. Automatically clears points that are
- // too old.
- void MoveForwardToTime(const base::TimeTicks& latest_time);
- // Removes the last stroke by removing the points since the last gap. If there
- // are no gaps, deletes all points. Returns the bounding rectangle of the
- // deleted points.
- gfx::Rect UndoLastStroke();
- // Removes all points.
- void Clear();
- // Gets the bounding box of the points, int coordinates.
- gfx::Rect GetBoundingBox() const;
- // Gets the bounding box of the points, float coordinates.
- gfx::RectF GetBoundingBoxF() const;
- // Returns the oldest point in the collection.
- FastInkPoint GetOldest() const;
- // Returns the newest point in the collection.
- FastInkPoint GetNewest() const;
- // Returns the number of points in the collection.
- int GetNumberOfPoints() const;
- // Whether there are any points or not.
- bool IsEmpty() const;
- // Expose the collection so callers can work with the points.
- const base::circular_deque<FastInkPoint>& points() const;
- // Returns the fadeout factor for a point. This is a value between 0.0 and
- // 1.0, where 0.0 corresponds to a recently added point, and 1.0 to a point
- // that is about to expire. Do not call this method if |life_duration_| is 0.
- float GetFadeoutFactor(int index) const;
- // Fills the container with predicted points based on |real_points|.
- void Predict(const FastInkPoints& real_points,
- const base::TimeTicks& current_time,
- base::TimeDelta prediction_duration,
- const gfx::Size& screen_size);
- private:
- const base::TimeDelta life_duration_;
- base::circular_deque<FastInkPoint> points_;
- // The latest time of the collection of points. This gets updated when new
- // points are added or when MoveForwardToTime is called.
- base::TimeTicks collection_latest_time_;
- };
- } // namespace fast_ink
- #endif // ASH_FAST_INK_FAST_INK_POINTS_H_
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