| // 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. |
| |
| #include "content/browser/renderer_host/input/synthetic_smooth_move_gesture.h" |
| |
| #include <stdint.h> |
| |
| #include "base/logging.h" |
| #include "ui/gfx/geometry/point_f.h" |
| |
| namespace content { |
| namespace { |
| |
| gfx::Vector2dF ProjectScalarOntoVector(float scalar, |
| const gfx::Vector2dF& vector) { |
| return gfx::ScaleVector2d(vector, scalar / vector.Length()); |
| } |
| |
| const int kDefaultSpeedInPixelsPerSec = 800; |
| |
| } // namespace |
| |
| SyntheticSmoothMoveGestureParams::SyntheticSmoothMoveGestureParams() |
| : speed_in_pixels_s(kDefaultSpeedInPixelsPerSec), |
| fling_velocity_x(0), |
| fling_velocity_y(0), |
| prevent_fling(true), |
| add_slop(true), |
| precise_scrolling_deltas(false), |
| scroll_by_page(false) {} |
| |
| SyntheticSmoothMoveGestureParams::SyntheticSmoothMoveGestureParams( |
| const SyntheticSmoothMoveGestureParams& other) = default; |
| |
| SyntheticSmoothMoveGestureParams::~SyntheticSmoothMoveGestureParams() {} |
| |
| SyntheticSmoothMoveGesture::SyntheticSmoothMoveGesture( |
| SyntheticSmoothMoveGestureParams params) |
| : params_(params), |
| current_move_segment_start_position_(params.start_point), |
| state_(SETUP), |
| needs_scroll_begin_(true) {} |
| |
| SyntheticSmoothMoveGesture::~SyntheticSmoothMoveGesture() {} |
| |
| SyntheticGesture::Result SyntheticSmoothMoveGesture::ForwardInputEvents( |
| const base::TimeTicks& timestamp, |
| SyntheticGestureTarget* target) { |
| if (state_ == SETUP) { |
| state_ = STARTED; |
| current_move_segment_ = -1; |
| current_move_segment_stop_time_ = timestamp; |
| } |
| |
| switch (params_.input_type) { |
| case SyntheticSmoothMoveGestureParams::TOUCH_INPUT: |
| if (!synthetic_pointer_driver_) |
| synthetic_pointer_driver_ = |
| SyntheticPointerDriver::Create(SyntheticGestureParams::TOUCH_INPUT); |
| ForwardTouchInputEvents(timestamp, target); |
| break; |
| case SyntheticSmoothMoveGestureParams::MOUSE_DRAG_INPUT: |
| if (!synthetic_pointer_driver_) |
| synthetic_pointer_driver_ = |
| SyntheticPointerDriver::Create(SyntheticGestureParams::MOUSE_INPUT); |
| ForwardMouseClickInputEvents(timestamp, target); |
| break; |
| case SyntheticSmoothMoveGestureParams::MOUSE_WHEEL_INPUT: |
| ForwardMouseWheelInputEvents(timestamp, target); |
| break; |
| default: |
| return SyntheticGesture::GESTURE_SOURCE_TYPE_NOT_IMPLEMENTED; |
| } |
| return (state_ == DONE) ? SyntheticGesture::GESTURE_FINISHED |
| : SyntheticGesture::GESTURE_RUNNING; |
| } |
| |
| // TODO(ssid): Clean up the switch statements by adding functions instead of |
| // large code, in the Forward*Events functions. Move the actions for all input |
| // types to different class (SyntheticInputDevice) which generates input events |
| // for all input types. The gesture class can use instance of device actions. |
| // Refer: crbug.com/461825 |
| |
| void SyntheticSmoothMoveGesture::ForwardTouchInputEvents( |
| const base::TimeTicks& timestamp, |
| SyntheticGestureTarget* target) { |
| switch (state_) { |
| case STARTED: |
| if (MoveIsNoOp()) { |
| state_ = DONE; |
| break; |
| } |
| if (params_.add_slop) |
| AddTouchSlopToFirstDistance(target); |
| ComputeNextMoveSegment(); |
| PressPoint(target, timestamp); |
| state_ = MOVING; |
| break; |
| case MOVING: { |
| base::TimeTicks event_timestamp = ClampTimestamp(timestamp); |
| gfx::Vector2dF delta = GetPositionDeltaAtTime(event_timestamp); |
| MovePoint(target, delta, event_timestamp); |
| |
| if (FinishedCurrentMoveSegment(event_timestamp)) { |
| if (!IsLastMoveSegment()) { |
| current_move_segment_start_position_ += |
| params_.distances[current_move_segment_]; |
| ComputeNextMoveSegment(); |
| } else if (params_.prevent_fling) { |
| state_ = STOPPING; |
| } else { |
| ReleasePoint(target, event_timestamp); |
| state_ = DONE; |
| } |
| } |
| } break; |
| case STOPPING: |
| if (timestamp - current_move_segment_stop_time_ >= |
| target->PointerAssumedStoppedTime()) { |
| base::TimeTicks event_timestamp = current_move_segment_stop_time_ + |
| target->PointerAssumedStoppedTime(); |
| ReleasePoint(target, event_timestamp); |
| state_ = DONE; |
| } |
| break; |
| case SETUP: |
| NOTREACHED() |
| << "State SETUP invalid for synthetic scroll using touch input."; |
| break; |
| case DONE: |
| NOTREACHED() |
| << "State DONE invalid for synthetic scroll using touch input."; |
| break; |
| } |
| } |
| |
| void SyntheticSmoothMoveGesture::ForwardMouseWheelInputEvents( |
| const base::TimeTicks& timestamp, |
| SyntheticGestureTarget* target) { |
| switch (state_) { |
| case STARTED: |
| if (MoveIsNoOp()) { |
| state_ = DONE; |
| break; |
| } |
| ComputeNextMoveSegment(); |
| state_ = MOVING; |
| break; |
| case MOVING: { |
| base::TimeTicks event_timestamp = ClampTimestamp(timestamp); |
| gfx::Vector2dF delta = GetPositionDeltaAtTime(event_timestamp) - |
| current_move_segment_total_delta_; |
| |
| // Android MotionEvents that carry mouse wheel ticks and the tick |
| // granularity. Since it's not easy to change this granularity, it means |
| // we can only scroll in terms of number of these ticks. Note also: if |
| // the delta is smaller than one tick size we wont send an event or |
| // accumulate it in current_move_segment_total_delta_ so that we don't |
| // consider that delta applied. If we did, slow scrolls would be entirely |
| // lost since we'd send 0 ticks in each event but assume delta was |
| // applied. |
| int pixels_per_wheel_tick = target->GetMouseWheelMinimumGranularity(); |
| if (pixels_per_wheel_tick) { |
| int wheel_ticks_x = static_cast<int>(delta.x() / pixels_per_wheel_tick); |
| int wheel_ticks_y = static_cast<int>(delta.y() / pixels_per_wheel_tick); |
| delta = gfx::Vector2dF(wheel_ticks_x * pixels_per_wheel_tick, |
| wheel_ticks_y * pixels_per_wheel_tick); |
| } |
| |
| if (delta.x() || delta.y()) { |
| blink::WebMouseWheelEvent::Phase phase = |
| needs_scroll_begin_ ? blink::WebMouseWheelEvent::kPhaseBegan |
| : blink::WebMouseWheelEvent::kPhaseChanged; |
| ForwardMouseWheelEvent(target, delta, phase, event_timestamp); |
| current_move_segment_total_delta_ += delta; |
| needs_scroll_begin_ = false; |
| } |
| |
| if (FinishedCurrentMoveSegment(event_timestamp)) { |
| if (!IsLastMoveSegment()) { |
| current_move_segment_total_delta_ = gfx::Vector2dF(); |
| ComputeNextMoveSegment(); |
| } else { |
| state_ = DONE; |
| |
| // Start flinging on the swipe action. |
| if (!params_.prevent_fling && (params_.fling_velocity_x != 0 || |
| params_.fling_velocity_y != 0)) { |
| ForwardFlingGestureEvent( |
| target, blink::WebGestureEvent::kGestureFlingStart); |
| } else { |
| // Forward a wheel event with phase ended and zero deltas. |
| ForwardMouseWheelEvent(target, gfx::Vector2d(), |
| blink::WebMouseWheelEvent::kPhaseEnded, |
| event_timestamp); |
| } |
| needs_scroll_begin_ = true; |
| } |
| } |
| } break; |
| case SETUP: |
| NOTREACHED() << "State SETUP invalid for synthetic scroll using mouse " |
| "wheel input."; |
| break; |
| case STOPPING: |
| NOTREACHED() << "State STOPPING invalid for synthetic scroll using mouse " |
| "wheel input."; |
| break; |
| case DONE: |
| NOTREACHED() |
| << "State DONE invalid for synthetic scroll using mouse wheel input."; |
| break; |
| } |
| } |
| |
| void SyntheticSmoothMoveGesture::ForwardMouseClickInputEvents( |
| const base::TimeTicks& timestamp, |
| SyntheticGestureTarget* target) { |
| switch (state_) { |
| case STARTED: |
| if (MoveIsNoOp()) { |
| state_ = DONE; |
| break; |
| } |
| ComputeNextMoveSegment(); |
| PressPoint(target, timestamp); |
| state_ = MOVING; |
| break; |
| case MOVING: { |
| base::TimeTicks event_timestamp = ClampTimestamp(timestamp); |
| gfx::Vector2dF delta = GetPositionDeltaAtTime(event_timestamp); |
| MovePoint(target, delta, event_timestamp); |
| |
| if (FinishedCurrentMoveSegment(event_timestamp)) { |
| if (!IsLastMoveSegment()) { |
| current_move_segment_start_position_ += |
| params_.distances[current_move_segment_]; |
| ComputeNextMoveSegment(); |
| } else { |
| ReleasePoint(target, event_timestamp); |
| state_ = DONE; |
| } |
| } |
| } break; |
| case STOPPING: |
| NOTREACHED() |
| << "State STOPPING invalid for synthetic drag using mouse input."; |
| break; |
| case SETUP: |
| NOTREACHED() |
| << "State SETUP invalid for synthetic drag using mouse input."; |
| break; |
| case DONE: |
| NOTREACHED() |
| << "State DONE invalid for synthetic drag using mouse input."; |
| break; |
| } |
| } |
| |
| void SyntheticSmoothMoveGesture::ForwardMouseWheelEvent( |
| SyntheticGestureTarget* target, |
| const gfx::Vector2dF& delta, |
| const blink::WebMouseWheelEvent::Phase phase, |
| const base::TimeTicks& timestamp) const { |
| blink::WebMouseWheelEvent mouse_wheel_event = |
| SyntheticWebMouseWheelEventBuilder::Build( |
| 0, 0, delta.x(), delta.y(), 0, params_.precise_scrolling_deltas, |
| params_.scroll_by_page); |
| |
| mouse_wheel_event.SetPositionInWidget( |
| current_move_segment_start_position_.x(), |
| current_move_segment_start_position_.y()); |
| mouse_wheel_event.phase = phase; |
| |
| mouse_wheel_event.SetTimeStamp(timestamp); |
| |
| target->DispatchInputEventToPlatform(mouse_wheel_event); |
| } |
| |
| void SyntheticSmoothMoveGesture::ForwardFlingGestureEvent( |
| SyntheticGestureTarget* target, |
| const blink::WebInputEvent::Type type) const { |
| blink::WebGestureEvent fling_gesture_event = |
| SyntheticWebGestureEventBuilder::Build( |
| type, blink::WebGestureDevice::kTouchpad); |
| fling_gesture_event.data.fling_start.velocity_x = params_.fling_velocity_x; |
| fling_gesture_event.data.fling_start.velocity_y = params_.fling_velocity_y; |
| fling_gesture_event.SetPositionInWidget(current_move_segment_start_position_); |
| target->DispatchInputEventToPlatform(fling_gesture_event); |
| } |
| |
| void SyntheticSmoothMoveGesture::PressPoint(SyntheticGestureTarget* target, |
| const base::TimeTicks& timestamp) { |
| DCHECK_EQ(current_move_segment_, 0); |
| synthetic_pointer_driver_->Press(current_move_segment_start_position_.x(), |
| current_move_segment_start_position_.y()); |
| synthetic_pointer_driver_->DispatchEvent(target, timestamp); |
| } |
| |
| void SyntheticSmoothMoveGesture::MovePoint(SyntheticGestureTarget* target, |
| const gfx::Vector2dF& delta, |
| const base::TimeTicks& timestamp) { |
| DCHECK_GE(current_move_segment_, 0); |
| DCHECK_LT(current_move_segment_, static_cast<int>(params_.distances.size())); |
| gfx::PointF new_position = current_move_segment_start_position_ + delta; |
| synthetic_pointer_driver_->Move(new_position.x(), new_position.y()); |
| synthetic_pointer_driver_->DispatchEvent(target, timestamp); |
| } |
| |
| void SyntheticSmoothMoveGesture::ReleasePoint( |
| SyntheticGestureTarget* target, |
| const base::TimeTicks& timestamp) { |
| DCHECK_EQ(current_move_segment_, |
| static_cast<int>(params_.distances.size()) - 1); |
| gfx::PointF position; |
| if (params_.input_type == |
| SyntheticSmoothMoveGestureParams::MOUSE_DRAG_INPUT) { |
| position = current_move_segment_start_position_ + |
| GetPositionDeltaAtTime(timestamp); |
| } |
| synthetic_pointer_driver_->Release(); |
| synthetic_pointer_driver_->DispatchEvent(target, timestamp); |
| } |
| |
| void SyntheticSmoothMoveGesture::AddTouchSlopToFirstDistance( |
| SyntheticGestureTarget* target) { |
| DCHECK_GE(params_.distances.size(), 1ul); |
| gfx::Vector2dF& first_move_distance = params_.distances[0]; |
| DCHECK_GT(first_move_distance.Length(), 0); |
| first_move_distance += ProjectScalarOntoVector(target->GetTouchSlopInDips(), |
| first_move_distance); |
| } |
| |
| gfx::Vector2dF SyntheticSmoothMoveGesture::GetPositionDeltaAtTime( |
| const base::TimeTicks& timestamp) const { |
| // Make sure the final delta is correct. Using the computation below can lead |
| // to issues with floating point precision. |
| // TODO(bokan): This comment makes it sound like we have pixel perfect |
| // precision. In fact, gestures can accumulate a significant amount of |
| // error (e.g. due to snapping to physical pixels on each event). |
| if (FinishedCurrentMoveSegment(timestamp)) |
| return params_.distances[current_move_segment_]; |
| |
| float delta_length = |
| params_.speed_in_pixels_s * |
| (timestamp - current_move_segment_start_time_).InSecondsF(); |
| return ProjectScalarOntoVector(delta_length, |
| params_.distances[current_move_segment_]); |
| } |
| |
| void SyntheticSmoothMoveGesture::ComputeNextMoveSegment() { |
| current_move_segment_++; |
| DCHECK_LT(current_move_segment_, static_cast<int>(params_.distances.size())); |
| int64_t total_duration_in_us = static_cast<int64_t>( |
| 1e6 * (params_.distances[current_move_segment_].Length() / |
| params_.speed_in_pixels_s)); |
| DCHECK_GT(total_duration_in_us, 0); |
| current_move_segment_start_time_ = current_move_segment_stop_time_; |
| current_move_segment_stop_time_ = |
| current_move_segment_start_time_ + |
| base::TimeDelta::FromMicroseconds(total_duration_in_us); |
| } |
| |
| base::TimeTicks SyntheticSmoothMoveGesture::ClampTimestamp( |
| const base::TimeTicks& timestamp) const { |
| return std::min(timestamp, current_move_segment_stop_time_); |
| } |
| |
| bool SyntheticSmoothMoveGesture::FinishedCurrentMoveSegment( |
| const base::TimeTicks& timestamp) const { |
| return timestamp >= current_move_segment_stop_time_; |
| } |
| |
| bool SyntheticSmoothMoveGesture::IsLastMoveSegment() const { |
| DCHECK_LT(current_move_segment_, static_cast<int>(params_.distances.size())); |
| return current_move_segment_ == |
| static_cast<int>(params_.distances.size()) - 1; |
| } |
| |
| bool SyntheticSmoothMoveGesture::MoveIsNoOp() const { |
| return params_.distances.size() == 0 || params_.distances[0].IsZero(); |
| } |
| |
| } // namespace content |
