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      1 // Copyright 2013 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 CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_PINCH_GESTURE_H_
      6 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_PINCH_GESTURE_H_
      7 
      8 #include "base/time/time.h"
      9 #include "content/browser/renderer_host/input/synthetic_gesture.h"
     10 #include "content/browser/renderer_host/input/synthetic_gesture_target.h"
     11 #include "content/common/content_export.h"
     12 #include "content/common/input/synthetic_pinch_gesture_params.h"
     13 #include "content/common/input/synthetic_web_input_event_builders.h"
     14 #include "third_party/WebKit/public/web/WebInputEvent.h"
     15 
     16 namespace content {
     17 
     18 class CONTENT_EXPORT SyntheticPinchGesture : public SyntheticGesture {
     19  public:
     20   explicit SyntheticPinchGesture(const SyntheticPinchGestureParams& params);
     21   virtual ~SyntheticPinchGesture();
     22 
     23   virtual SyntheticGesture::Result ForwardInputEvents(
     24       const base::TimeTicks& timestamp,
     25       SyntheticGestureTarget* target) OVERRIDE;
     26 
     27  private:
     28   enum GestureState {
     29     SETUP,
     30     STARTED,
     31     MOVING,
     32     DONE
     33   };
     34 
     35   void ForwardTouchInputEvents(const base::TimeTicks& timestamp,
     36                                SyntheticGestureTarget* target);
     37 
     38   void UpdateTouchPoints(const base::TimeTicks& timestamp);
     39   void PressTouchPoints(SyntheticGestureTarget* target,
     40                         const base::TimeTicks& timestamp);
     41   void MoveTouchPoints(SyntheticGestureTarget* target, float delta,
     42                        const base::TimeTicks& timestamp);
     43   void ReleaseTouchPoints(SyntheticGestureTarget* target,
     44                           const base::TimeTicks& timestamp);
     45   void ForwardTouchEvent(SyntheticGestureTarget* target,
     46                          const base::TimeTicks& timestamp);
     47 
     48   void SetupCoordinatesAndStopTime(SyntheticGestureTarget* target);
     49   float GetDeltaForPointer0AtTime(const base::TimeTicks& timestamp) const;
     50   base::TimeTicks ClampTimestamp(const base::TimeTicks& timestamp) const;
     51   bool HasReachedTarget(const base::TimeTicks& timestamp) const;
     52 
     53   SyntheticPinchGestureParams params_;
     54   float start_y_0_;
     55   float start_y_1_;
     56   float max_pointer_delta_0_;
     57   SyntheticGestureParams::GestureSourceType gesture_source_type_;
     58   GestureState state_;
     59   SyntheticWebTouchEvent touch_event_;
     60   base::TimeTicks start_time_;
     61   base::TimeTicks stop_time_;
     62 
     63  private:
     64   DISALLOW_COPY_AND_ASSIGN(SyntheticPinchGesture);
     65 };
     66 
     67 }  // namespace content
     68 
     69 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_PINCH_GESTURE_H_
     70