| // 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_ |
| |
| #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/vector2d.h" |
| #include "ui/gfx/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). |
| // 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 { |
| public: |
| explicit SyntheticSmoothScrollGesture( |
| const SyntheticSmoothScrollGestureParams& params); |
| virtual ~SyntheticSmoothScrollGesture(); |
| |
| virtual 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( |
| 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 AddTouchSlopToFirstDistance(SyntheticGestureTarget* target); |
| gfx::Vector2dF GetPositionDeltaAtTime(const base::TimeTicks& timestamp) |
| const; |
| void ComputeNextScrollSegment(); |
| base::TimeTicks ClampTimestamp(const base::TimeTicks& timestamp) const; |
| bool FinishedCurrentScrollSegment(const base::TimeTicks& timestamp) const; |
| bool IsLastScrollSegment() const; |
| bool ScrollIsNoOp() const; |
| |
| SyntheticSmoothScrollGestureParams params_; |
| // Used for mouse input. |
| gfx::Vector2d current_scroll_segment_total_delta_discrete_; |
| // Used for touch input. |
| gfx::Point current_scroll_segment_start_position_; |
| SyntheticWebTouchEvent touch_event_; |
| SyntheticGestureParams::GestureSourceType gesture_source_type_; |
| GestureState state_; |
| int current_scroll_segment_; |
| base::TimeTicks current_scroll_segment_start_time_; |
| base::TimeTicks current_scroll_segment_stop_time_; |
| |
| DISALLOW_COPY_AND_ASSIGN(SyntheticSmoothScrollGesture); |
| }; |
| |
| } // namespace content |
| |
| #endif // CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_SMOOTH_SCROLL_GESTURE_H_ |