Adding synthetic touch/mouse drag [Part1]

content/browser/renderer_host/input/synthetic_smooth_move_gesture.h

 // Copyright 2013 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 CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_SMOOTH_SCROLL_GESTURE_H_
-#define CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_SMOOTH_SCROLL_GESTURE_H_
+#ifndef CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_SMOOTH_MOVE_GESTURE_H_
+#define CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_SMOOTH_MOVE_GESTURE_H_
+
+#include <vector>
 
 #include "base/time/time.h"
 #include "content/browser/renderer_host/input/synthetic_gesture.h"
 #include "content/browser/renderer_host/input/synthetic_gesture_target.h"
 #include "content/common/content_export.h"
-#include "content/common/input/synthetic_smooth_scroll_gesture_params.h"
 #include "content/common/input/synthetic_web_input_event_builders.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "ui/gfx/geometry/vector2d.h"
 #include "ui/gfx/geometry/vector2d_f.h"
 
 namespace content {
 
-// Simulates scrolling given a sequence of scroll distances as a continuous
-// gestures (i.e. when synthesizing touch events, the touch pointer is not
-// lifted when changing scroll direction).
+// This class is used as helper class for simulation of scroll and drag.
+// Simulates scrolling/dragging given a sequence of distances as a continuous
+// gestures (i.e. when synthesizing touch or mouse drag events, the pointer is
+// not lifted when changing scroll direction).
 // If no distance is provided or the first one is 0, no touch events are
 // generated.
-// When synthesizing touch events, the first distance is extended to compensate
-// for the touch slop.
-class CONTENT_EXPORT SyntheticSmoothScrollGesture : public SyntheticGesture {
+// When synthesizing touch events for scrolling, the first distance is extended
+// to compensate for the touch slop.
+class CONTENT_EXPORT SyntheticSmoothMoveGesture : public SyntheticGesture {
  public:
-  explicit SyntheticSmoothScrollGesture(
-      const SyntheticSmoothScrollGestureParams& params);
-  ~SyntheticSmoothScrollGesture() override;
+  enum InputType {
+    MOUSE_DRAG_INPUT,
+    MOUSE_WHEEL_INPUT,
+    TOUCH_DRAG_INPUT,

[Sami, 2015/02/20 17:57:07]

What's the difference between TOUCH_DRAG and TOUCH_SCROLL? I don't think they
should be separate, and I don't think the move class should know anything about
scrolling in general.

+    TOUCH_SCROLL_INPUT
+  };
 
+  SyntheticSmoothMoveGesture(
+      InputType input_type,
+      gfx::PointF start_point,
+      std::vector<gfx::Vector2dF> distances,
+      int speed_in_pixels_s,
+      bool prevent_fling);
+  ~SyntheticSmoothMoveGesture() override;
+
+  // SyntheticGesture implementation:
   SyntheticGesture::Result ForwardInputEvents(
       const base::TimeTicks& timestamp,
       SyntheticGestureTarget* target) override;
 
  private:
   enum GestureState {
     SETUP,
     STARTED,
     MOVING,
     STOPPING,
     DONE
   };
 
   void ForwardTouchInputEvents(
       const base::TimeTicks& timestamp, SyntheticGestureTarget* target);
-  void ForwardMouseInputEvents(
+  void ForwardMouseWheelInputEvents(
+      const base::TimeTicks& timestamp, SyntheticGestureTarget* target);
+  void ForwardMouseClickInputEvents(
       const base::TimeTicks& timestamp, SyntheticGestureTarget* target);
 
   void ForwardTouchEvent(SyntheticGestureTarget* target,
                          const base::TimeTicks& timestamp);
   void ForwardMouseWheelEvent(SyntheticGestureTarget* target,
                               const gfx::Vector2dF& delta,
                               const base::TimeTicks& timestamp) const;
 
   void PressTouchPoint(SyntheticGestureTarget* target,
                        const base::TimeTicks& timestamp);
   void MoveTouchPoint(SyntheticGestureTarget* target,
                       const gfx::Vector2dF& delta,
                       const base::TimeTicks& timestamp);
   void ReleaseTouchPoint(SyntheticGestureTarget* target,
                          const base::TimeTicks& timestamp);
 
+  void PressMousePoint(SyntheticGestureTarget* target,
+                       const base::TimeTicks& timestamp);
+  void ReleaseMousePoint(SyntheticGestureTarget* target,
+                         const base::TimeTicks& timestamp);
+  void MoveMousePoint(SyntheticGestureTarget* target,
+                      const gfx::Vector2dF& delta,
+                      const base::TimeTicks& timestamp);
+
   void AddTouchSlopToFirstDistance(SyntheticGestureTarget* target);
-  gfx::Vector2dF GetPositionDeltaAtTime(const base::TimeTicks& timestamp)
-      const;
-  void ComputeNextScrollSegment();
+  gfx::Vector2dF GetPositionDeltaAtTime(const base::TimeTicks& timestamp) const;
+  void ComputeNextMoveSegment();
   base::TimeTicks ClampTimestamp(const base::TimeTicks& timestamp) const;
-  bool FinishedCurrentScrollSegment(const base::TimeTicks& timestamp) const;
-  bool IsLastScrollSegment() const;
-  bool ScrollIsNoOp() const;
+  bool FinishedCurrentMoveSegment(const base::TimeTicks& timestamp) const;
+  bool IsLastMoveSegment() const;
+  bool MoveIsNoOp() const;
 
-  SyntheticSmoothScrollGestureParams params_;
   // Used for mouse input.
-  gfx::Vector2d current_scroll_segment_total_delta_discrete_;
+  gfx::Vector2d current_move_segment_total_delta_discrete_;
   // Used for touch input.
-  gfx::Point current_scroll_segment_start_position_;
+  gfx::PointF current_move_segment_start_position_;
   SyntheticWebTouchEvent touch_event_;
-  SyntheticGestureParams::GestureSourceType gesture_source_type_;
+  InputType input_type_;
   GestureState state_;
-  int current_scroll_segment_;
-  base::TimeTicks current_scroll_segment_start_time_;
-  base::TimeTicks current_scroll_segment_stop_time_;
+  int current_move_segment_;
+  base::TimeTicks current_move_segment_start_time_;
+  base::TimeTicks current_move_segment_stop_time_;
+  std::vector<gfx::Vector2dF> move_distances_;
+  int speed_in_pixels_s_;
+  bool prevent_fling_;
 
-  DISALLOW_COPY_AND_ASSIGN(SyntheticSmoothScrollGesture);
+  DISALLOW_COPY_AND_ASSIGN(SyntheticSmoothMoveGesture);
 };
 
 }  // namespace content
 
-#endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_SMOOTH_SCROLL_GESTURE_H_
+#endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_SMOOTH_MOVE_GESTURE_H_