| // 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/renderer/input/input_handler_proxy.h" |
| |
| #include "base/auto_reset.h" |
| #include "base/command_line.h" |
| #include "base/logging.h" |
| #include "base/metrics/histogram.h" |
| #include "base/trace_event/trace_event.h" |
| #include "content/common/input/did_overscroll_params.h" |
| #include "content/common/input/web_input_event_traits.h" |
| #include "content/public/common/content_switches.h" |
| #include "content/renderer/input/input_handler_proxy_client.h" |
| #include "content/renderer/input/input_scroll_elasticity_controller.h" |
| #include "third_party/WebKit/public/platform/Platform.h" |
| #include "third_party/WebKit/public/web/WebInputEvent.h" |
| #include "ui/events/latency_info.h" |
| #include "ui/gfx/frame_time.h" |
| #include "ui/gfx/geometry/point_conversions.h" |
| |
| using blink::WebFloatPoint; |
| using blink::WebFloatSize; |
| using blink::WebGestureEvent; |
| using blink::WebInputEvent; |
| using blink::WebMouseEvent; |
| using blink::WebMouseWheelEvent; |
| using blink::WebPoint; |
| using blink::WebTouchEvent; |
| using blink::WebTouchPoint; |
| |
| namespace { |
| |
| // Maximum time between a fling event's timestamp and the first |Animate| call |
| // for the fling curve to use the fling timestamp as the initial animation time. |
| // Two frames allows a minor delay between event creation and the first animate. |
| const double kMaxSecondsFromFlingTimestampToFirstAnimate = 2. / 60.; |
| |
| // Threshold for determining whether a fling scroll delta should have caused the |
| // client to scroll. |
| const float kScrollEpsilon = 0.1f; |
| |
| // Minimum fling velocity required for the active fling and new fling for the |
| // two to accumulate. |
| const double kMinBoostFlingSpeedSquare = 350. * 350.; |
| |
| // Minimum velocity for the active touch scroll to preserve (boost) an active |
| // fling for which cancellation has been deferred. |
| const double kMinBoostTouchScrollSpeedSquare = 150 * 150.; |
| |
| // Timeout window after which the active fling will be cancelled if no scrolls |
| // or flings of sufficient velocity relative to the current fling are received. |
| // The default value on Android native views is 40ms, but we use a slightly |
| // increased value to accomodate small IPC message delays. |
| const double kFlingBoostTimeoutDelaySeconds = 0.045; |
| |
| gfx::Vector2dF ToClientScrollIncrement(const WebFloatSize& increment) { |
| return gfx::Vector2dF(-increment.width, -increment.height); |
| } |
| |
| double InSecondsF(const base::TimeTicks& time) { |
| return (time - base::TimeTicks()).InSecondsF(); |
| } |
| |
| bool ShouldSuppressScrollForFlingBoosting( |
| const gfx::Vector2dF& current_fling_velocity, |
| const WebGestureEvent& scroll_update_event, |
| double time_since_last_boost_event) { |
| DCHECK_EQ(WebInputEvent::GestureScrollUpdate, scroll_update_event.type); |
| |
| gfx::Vector2dF dx(scroll_update_event.data.scrollUpdate.deltaX, |
| scroll_update_event.data.scrollUpdate.deltaY); |
| if (gfx::DotProduct(current_fling_velocity, dx) <= 0) |
| return false; |
| |
| if (time_since_last_boost_event < 0.001) |
| return true; |
| |
| // TODO(jdduke): Use |scroll_update_event.data.scrollUpdate.velocity{X,Y}|. |
| // The scroll must be of sufficient velocity to maintain the active fling. |
| const gfx::Vector2dF scroll_velocity = |
| gfx::ScaleVector2d(dx, 1. / time_since_last_boost_event); |
| if (scroll_velocity.LengthSquared() < kMinBoostTouchScrollSpeedSquare) |
| return false; |
| |
| return true; |
| } |
| |
| bool ShouldBoostFling(const gfx::Vector2dF& current_fling_velocity, |
| const WebGestureEvent& fling_start_event) { |
| DCHECK_EQ(WebInputEvent::GestureFlingStart, fling_start_event.type); |
| |
| gfx::Vector2dF new_fling_velocity( |
| fling_start_event.data.flingStart.velocityX, |
| fling_start_event.data.flingStart.velocityY); |
| |
| if (gfx::DotProduct(current_fling_velocity, new_fling_velocity) <= 0) |
| return false; |
| |
| if (current_fling_velocity.LengthSquared() < kMinBoostFlingSpeedSquare) |
| return false; |
| |
| if (new_fling_velocity.LengthSquared() < kMinBoostFlingSpeedSquare) |
| return false; |
| |
| return true; |
| } |
| |
| WebGestureEvent ObtainGestureScrollBegin(const WebGestureEvent& event) { |
| WebGestureEvent scroll_begin_event = event; |
| scroll_begin_event.type = WebInputEvent::GestureScrollBegin; |
| scroll_begin_event.data.scrollBegin.deltaXHint = 0; |
| scroll_begin_event.data.scrollBegin.deltaYHint = 0; |
| return scroll_begin_event; |
| } |
| |
| void ReportInputEventLatencyUma(const WebInputEvent& event, |
| const ui::LatencyInfo& latency_info) { |
| if (!(event.type == WebInputEvent::GestureScrollBegin || |
| event.type == WebInputEvent::GestureScrollUpdate || |
| event.type == WebInputEvent::GesturePinchBegin || |
| event.type == WebInputEvent::GesturePinchUpdate || |
| event.type == WebInputEvent::GestureFlingStart)) { |
| return; |
| } |
| |
| ui::LatencyInfo::LatencyMap::const_iterator it = |
| latency_info.latency_components.find(std::make_pair( |
| ui::INPUT_EVENT_LATENCY_ORIGINAL_COMPONENT, 0)); |
| |
| if (it == latency_info.latency_components.end()) |
| return; |
| |
| base::TimeDelta delta = base::TimeTicks::Now() - it->second.event_time; |
| for (size_t i = 0; i < it->second.event_count; ++i) { |
| switch (event.type) { |
| case blink::WebInputEvent::GestureScrollBegin: |
| UMA_HISTOGRAM_CUSTOM_COUNTS( |
| "Event.Latency.RendererImpl.GestureScrollBegin", |
| delta.InMicroseconds(), 1, 1000000, 100); |
| break; |
| case blink::WebInputEvent::GestureScrollUpdate: |
| UMA_HISTOGRAM_CUSTOM_COUNTS( |
| // So named for historical reasons. |
| "Event.Latency.RendererImpl.GestureScroll2", |
| delta.InMicroseconds(), 1, 1000000, 100); |
| break; |
| case blink::WebInputEvent::GesturePinchBegin: |
| UMA_HISTOGRAM_CUSTOM_COUNTS( |
| "Event.Latency.RendererImpl.GesturePinchBegin", |
| delta.InMicroseconds(), 1, 1000000, 100); |
| break; |
| case blink::WebInputEvent::GesturePinchUpdate: |
| UMA_HISTOGRAM_CUSTOM_COUNTS( |
| "Event.Latency.RendererImpl.GesturePinchUpdate", |
| delta.InMicroseconds(), 1, 1000000, 100); |
| break; |
| case blink::WebInputEvent::GestureFlingStart: |
| UMA_HISTOGRAM_CUSTOM_COUNTS( |
| "Event.Latency.RendererImpl.GestureFlingStart", |
| delta.InMicroseconds(), 1, 1000000, 100); |
| break; |
| default: |
| NOTREACHED(); |
| break; |
| } |
| } |
| } |
| |
| } // namespace |
| |
| namespace content { |
| |
| InputHandlerProxy::InputHandlerProxy(cc::InputHandler* input_handler, |
| InputHandlerProxyClient* client) |
| : client_(client), |
| input_handler_(input_handler), |
| deferred_fling_cancel_time_seconds_(0), |
| #ifndef NDEBUG |
| expect_scroll_update_end_(false), |
| #endif |
| gesture_scroll_on_impl_thread_(false), |
| gesture_pinch_on_impl_thread_(false), |
| fling_may_be_active_on_main_thread_(false), |
| disallow_horizontal_fling_scroll_(false), |
| disallow_vertical_fling_scroll_(false), |
| has_fling_animation_started_(false), |
| uma_latency_reporting_enabled_(base::TimeTicks::IsHighResolution()) { |
| DCHECK(client); |
| input_handler_->BindToClient(this); |
| smooth_scroll_enabled_ = base::CommandLine::ForCurrentProcess()->HasSwitch( |
| switches::kEnableSmoothScrolling); |
| cc::ScrollElasticityHelper* scroll_elasticity_helper = |
| input_handler_->CreateScrollElasticityHelper(); |
| if (scroll_elasticity_helper) { |
| scroll_elasticity_controller_.reset( |
| new InputScrollElasticityController(scroll_elasticity_helper)); |
| } |
| } |
| |
| InputHandlerProxy::~InputHandlerProxy() {} |
| |
| void InputHandlerProxy::WillShutdown() { |
| scroll_elasticity_controller_.reset(); |
| input_handler_ = NULL; |
| client_->WillShutdown(); |
| } |
| |
| InputHandlerProxy::EventDisposition |
| InputHandlerProxy::HandleInputEventWithLatencyInfo( |
| const WebInputEvent& event, |
| ui::LatencyInfo* latency_info) { |
| DCHECK(input_handler_); |
| |
| if (uma_latency_reporting_enabled_) |
| ReportInputEventLatencyUma(event, *latency_info); |
| |
| TRACE_EVENT_FLOW_STEP0("input,benchmark", |
| "LatencyInfo.Flow", |
| TRACE_ID_DONT_MANGLE(latency_info->trace_id), |
| "HandleInputEventImpl"); |
| |
| scoped_ptr<cc::SwapPromiseMonitor> latency_info_swap_promise_monitor = |
| input_handler_->CreateLatencyInfoSwapPromiseMonitor(latency_info); |
| InputHandlerProxy::EventDisposition disposition = HandleInputEvent(event); |
| return disposition; |
| } |
| |
| InputHandlerProxy::EventDisposition InputHandlerProxy::HandleInputEvent( |
| const WebInputEvent& event) { |
| DCHECK(input_handler_); |
| TRACE_EVENT1("input,benchmark", "InputHandlerProxy::HandleInputEvent", |
| "type", WebInputEventTraits::GetName(event.type)); |
| |
| client_->DidReceiveInputEvent(event.type); |
| if (FilterInputEventForFlingBoosting(event)) |
| return DID_HANDLE; |
| |
| switch (event.type) { |
| case WebInputEvent::MouseWheel: |
| return HandleMouseWheel(static_cast<const WebMouseWheelEvent&>(event)); |
| |
| case WebInputEvent::GestureScrollBegin: |
| return HandleGestureScrollBegin( |
| static_cast<const WebGestureEvent&>(event)); |
| |
| case WebInputEvent::GestureScrollUpdate: |
| return HandleGestureScrollUpdate( |
| static_cast<const WebGestureEvent&>(event)); |
| |
| case WebInputEvent::GestureScrollEnd: |
| return HandleGestureScrollEnd(static_cast<const WebGestureEvent&>(event)); |
| |
| case WebInputEvent::GesturePinchBegin: { |
| DCHECK(!gesture_pinch_on_impl_thread_); |
| const WebGestureEvent& gesture_event = |
| static_cast<const WebGestureEvent&>(event); |
| if (gesture_event.sourceDevice == blink::WebGestureDeviceTouchpad && |
| input_handler_->HaveWheelEventHandlersAt( |
| gfx::Point(gesture_event.x, gesture_event.y))) { |
| return DID_NOT_HANDLE; |
| } else { |
| input_handler_->PinchGestureBegin(); |
| gesture_pinch_on_impl_thread_ = true; |
| return DID_HANDLE; |
| } |
| } |
| |
| case WebInputEvent::GesturePinchEnd: |
| if (gesture_pinch_on_impl_thread_) { |
| gesture_pinch_on_impl_thread_ = false; |
| input_handler_->PinchGestureEnd(); |
| return DID_HANDLE; |
| } else { |
| return DID_NOT_HANDLE; |
| } |
| |
| case WebInputEvent::GesturePinchUpdate: { |
| if (gesture_pinch_on_impl_thread_) { |
| const WebGestureEvent& gesture_event = |
| static_cast<const WebGestureEvent&>(event); |
| input_handler_->PinchGestureUpdate( |
| gesture_event.data.pinchUpdate.scale, |
| gfx::Point(gesture_event.x, gesture_event.y)); |
| return DID_HANDLE; |
| } else { |
| return DID_NOT_HANDLE; |
| } |
| } |
| |
| case WebInputEvent::GestureFlingStart: |
| return HandleGestureFlingStart( |
| *static_cast<const WebGestureEvent*>(&event)); |
| |
| case WebInputEvent::GestureFlingCancel: |
| if (CancelCurrentFling()) |
| return DID_HANDLE; |
| else if (!fling_may_be_active_on_main_thread_) |
| return DROP_EVENT; |
| return DID_NOT_HANDLE; |
| |
| case WebInputEvent::TouchStart: |
| return HandleTouchStart(static_cast<const WebTouchEvent&>(event)); |
| |
| case WebInputEvent::MouseMove: { |
| const WebMouseEvent& mouse_event = |
| static_cast<const WebMouseEvent&>(event); |
| // TODO(tony): Ignore when mouse buttons are down? |
| // TODO(davemoore): This should never happen, but bug #326635 showed some |
| // surprising crashes. |
| CHECK(input_handler_); |
| input_handler_->MouseMoveAt(gfx::Point(mouse_event.x, mouse_event.y)); |
| return DID_NOT_HANDLE; |
| } |
| |
| default: |
| if (WebInputEvent::isKeyboardEventType(event.type)) { |
| // Only call |CancelCurrentFling()| if a fling was active, as it will |
| // otherwise disrupt an in-progress touch scroll. |
| if (fling_curve_) |
| CancelCurrentFling(); |
| } |
| break; |
| } |
| |
| return DID_NOT_HANDLE; |
| } |
| |
| InputHandlerProxy::EventDisposition InputHandlerProxy::HandleMouseWheel( |
| const WebMouseWheelEvent& wheel_event) { |
| InputHandlerProxy::EventDisposition result = DID_NOT_HANDLE; |
| cc::InputHandlerScrollResult scroll_result; |
| |
| if (wheel_event.scrollByPage) { |
| // TODO(jamesr): We don't properly handle scroll by page in the compositor |
| // thread, so punt it to the main thread. http://crbug.com/236639 |
| result = DID_NOT_HANDLE; |
| } else if (!wheel_event.canScroll) { |
| // Wheel events with |canScroll| == false will not trigger scrolling, |
| // only event handlers. Forward to the main thread. |
| result = DID_NOT_HANDLE; |
| } else if (smooth_scroll_enabled_) { |
| cc::InputHandler::ScrollStatus scroll_status = |
| input_handler_->ScrollAnimated( |
| gfx::Point(wheel_event.x, wheel_event.y), |
| gfx::Vector2dF(-wheel_event.deltaX, -wheel_event.deltaY)); |
| switch (scroll_status) { |
| case cc::InputHandler::ScrollStarted: |
| result = DID_HANDLE; |
| break; |
| case cc::InputHandler::ScrollIgnored: |
| result = DROP_EVENT; |
| default: |
| result = DID_NOT_HANDLE; |
| break; |
| } |
| } else { |
| cc::InputHandler::ScrollStatus scroll_status = input_handler_->ScrollBegin( |
| gfx::Point(wheel_event.x, wheel_event.y), cc::InputHandler::Wheel); |
| switch (scroll_status) { |
| case cc::InputHandler::ScrollStarted: { |
| TRACE_EVENT_INSTANT2( |
| "input", "InputHandlerProxy::handle_input wheel scroll", |
| TRACE_EVENT_SCOPE_THREAD, "deltaX", -wheel_event.deltaX, "deltaY", |
| -wheel_event.deltaY); |
| gfx::Point scroll_point(wheel_event.x, wheel_event.y); |
| gfx::Vector2dF scroll_delta(-wheel_event.deltaX, -wheel_event.deltaY); |
| scroll_result = input_handler_->ScrollBy(scroll_point, scroll_delta); |
| HandleOverscroll(scroll_point, scroll_result); |
| input_handler_->ScrollEnd(); |
| result = scroll_result.did_scroll ? DID_HANDLE : DROP_EVENT; |
| break; |
| } |
| case cc::InputHandler::ScrollIgnored: |
| // TODO(jamesr): This should be DROP_EVENT, but in cases where we fail |
| // to properly sync scrollability it's safer to send the event to the |
| // main thread. Change back to DROP_EVENT once we have synchronization |
| // bugs sorted out. |
| result = DID_NOT_HANDLE; |
| break; |
| case cc::InputHandler::ScrollUnknown: |
| case cc::InputHandler::ScrollOnMainThread: |
| result = DID_NOT_HANDLE; |
| break; |
| case cc::InputHandler::ScrollStatusCount: |
| NOTREACHED(); |
| break; |
| } |
| } |
| |
| // Send the event and its disposition to the elasticity controller to update |
| // the over-scroll animation. If the event is to be handled on the main |
| // thread, the event and its disposition will be sent to the elasticity |
| // controller after being handled on the main thread. |
| if (scroll_elasticity_controller_ && result != DID_NOT_HANDLE) { |
| // Note that the call to the elasticity controller is made asynchronously, |
| // to minimize divergence between main thread and impl thread event |
| // handling paths. |
| base::MessageLoop::current()->PostTask( |
| FROM_HERE, |
| base::Bind(&InputScrollElasticityController::ObserveWheelEventAndResult, |
| scroll_elasticity_controller_->GetWeakPtr(), wheel_event, |
| scroll_result)); |
| } |
| return result; |
| } |
| |
| InputHandlerProxy::EventDisposition InputHandlerProxy::HandleGestureScrollBegin( |
| const WebGestureEvent& gesture_event) { |
| DCHECK(!gesture_scroll_on_impl_thread_); |
| #ifndef NDEBUG |
| DCHECK(!expect_scroll_update_end_); |
| expect_scroll_update_end_ = true; |
| #endif |
| cc::InputHandler::ScrollStatus scroll_status = input_handler_->ScrollBegin( |
| gfx::Point(gesture_event.x, gesture_event.y), |
| cc::InputHandler::Gesture); |
| UMA_HISTOGRAM_ENUMERATION("Renderer4.CompositorScrollHitTestResult", |
| scroll_status, |
| cc::InputHandler::ScrollStatusCount); |
| switch (scroll_status) { |
| case cc::InputHandler::ScrollStarted: |
| TRACE_EVENT_INSTANT0("input", |
| "InputHandlerProxy::handle_input gesture scroll", |
| TRACE_EVENT_SCOPE_THREAD); |
| gesture_scroll_on_impl_thread_ = true; |
| return DID_HANDLE; |
| case cc::InputHandler::ScrollUnknown: |
| case cc::InputHandler::ScrollOnMainThread: |
| return DID_NOT_HANDLE; |
| case cc::InputHandler::ScrollIgnored: |
| return DROP_EVENT; |
| case cc::InputHandler::ScrollStatusCount: |
| NOTREACHED(); |
| break; |
| } |
| return DID_NOT_HANDLE; |
| } |
| |
| InputHandlerProxy::EventDisposition |
| InputHandlerProxy::HandleGestureScrollUpdate( |
| const WebGestureEvent& gesture_event) { |
| #ifndef NDEBUG |
| DCHECK(expect_scroll_update_end_); |
| #endif |
| |
| if (!gesture_scroll_on_impl_thread_ && !gesture_pinch_on_impl_thread_) |
| return DID_NOT_HANDLE; |
| |
| gfx::Point scroll_point(gesture_event.x, gesture_event.y); |
| gfx::Vector2dF scroll_delta(-gesture_event.data.scrollUpdate.deltaX, |
| -gesture_event.data.scrollUpdate.deltaY); |
| cc::InputHandlerScrollResult scroll_result = input_handler_->ScrollBy( |
| scroll_point, scroll_delta); |
| HandleOverscroll(scroll_point, scroll_result); |
| return scroll_result.did_scroll ? DID_HANDLE : DROP_EVENT; |
| } |
| |
| InputHandlerProxy::EventDisposition InputHandlerProxy::HandleGestureScrollEnd( |
| const WebGestureEvent& gesture_event) { |
| #ifndef NDEBUG |
| DCHECK(expect_scroll_update_end_); |
| expect_scroll_update_end_ = false; |
| #endif |
| input_handler_->ScrollEnd(); |
| if (!gesture_scroll_on_impl_thread_) |
| return DID_NOT_HANDLE; |
| gesture_scroll_on_impl_thread_ = false; |
| return DID_HANDLE; |
| } |
| |
| InputHandlerProxy::EventDisposition InputHandlerProxy::HandleGestureFlingStart( |
| const WebGestureEvent& gesture_event) { |
| cc::InputHandler::ScrollStatus scroll_status; |
| |
| if (gesture_event.sourceDevice == blink::WebGestureDeviceTouchpad) { |
| scroll_status = input_handler_->ScrollBegin( |
| gfx::Point(gesture_event.x, gesture_event.y), |
| cc::InputHandler::NonBubblingGesture); |
| } else { |
| if (!gesture_scroll_on_impl_thread_) |
| scroll_status = cc::InputHandler::ScrollOnMainThread; |
| else |
| scroll_status = input_handler_->FlingScrollBegin(); |
| } |
| |
| #ifndef NDEBUG |
| expect_scroll_update_end_ = false; |
| #endif |
| |
| switch (scroll_status) { |
| case cc::InputHandler::ScrollStarted: { |
| if (gesture_event.sourceDevice == blink::WebGestureDeviceTouchpad) |
| input_handler_->ScrollEnd(); |
| |
| const float vx = gesture_event.data.flingStart.velocityX; |
| const float vy = gesture_event.data.flingStart.velocityY; |
| current_fling_velocity_ = gfx::Vector2dF(vx, vy); |
| DCHECK(!current_fling_velocity_.IsZero()); |
| fling_curve_.reset(client_->CreateFlingAnimationCurve( |
| gesture_event.sourceDevice, |
| WebFloatPoint(vx, vy), |
| blink::WebSize())); |
| disallow_horizontal_fling_scroll_ = !vx; |
| disallow_vertical_fling_scroll_ = !vy; |
| TRACE_EVENT_ASYNC_BEGIN2("input", |
| "InputHandlerProxy::HandleGestureFling::started", |
| this, |
| "vx", |
| vx, |
| "vy", |
| vy); |
| // Note that the timestamp will only be used to kickstart the animation if |
| // its sufficiently close to the timestamp of the first call |Animate()|. |
| has_fling_animation_started_ = false; |
| fling_parameters_.startTime = gesture_event.timeStampSeconds; |
| fling_parameters_.delta = WebFloatPoint(vx, vy); |
| fling_parameters_.point = WebPoint(gesture_event.x, gesture_event.y); |
| fling_parameters_.globalPoint = |
| WebPoint(gesture_event.globalX, gesture_event.globalY); |
| fling_parameters_.modifiers = gesture_event.modifiers; |
| fling_parameters_.sourceDevice = gesture_event.sourceDevice; |
| input_handler_->SetNeedsAnimate(); |
| return DID_HANDLE; |
| } |
| case cc::InputHandler::ScrollUnknown: |
| case cc::InputHandler::ScrollOnMainThread: { |
| TRACE_EVENT_INSTANT0("input", |
| "InputHandlerProxy::HandleGestureFling::" |
| "scroll_on_main_thread", |
| TRACE_EVENT_SCOPE_THREAD); |
| fling_may_be_active_on_main_thread_ = true; |
| return DID_NOT_HANDLE; |
| } |
| case cc::InputHandler::ScrollIgnored: { |
| TRACE_EVENT_INSTANT0( |
| "input", |
| "InputHandlerProxy::HandleGestureFling::ignored", |
| TRACE_EVENT_SCOPE_THREAD); |
| if (gesture_event.sourceDevice == blink::WebGestureDeviceTouchpad) { |
| // We still pass the curve to the main thread if there's nothing |
| // scrollable, in case something |
| // registers a handler before the curve is over. |
| return DID_NOT_HANDLE; |
| } |
| return DROP_EVENT; |
| } |
| case cc::InputHandler::ScrollStatusCount: |
| NOTREACHED(); |
| break; |
| } |
| return DID_NOT_HANDLE; |
| } |
| |
| InputHandlerProxy::EventDisposition InputHandlerProxy::HandleTouchStart( |
| const blink::WebTouchEvent& touch_event) { |
| for (size_t i = 0; i < touch_event.touchesLength; ++i) { |
| if (touch_event.touches[i].state != WebTouchPoint::StatePressed) |
| continue; |
| if (input_handler_->DoTouchEventsBlockScrollAt( |
| gfx::Point(touch_event.touches[i].position.x, |
| touch_event.touches[i].position.y))) { |
| // TODO(rbyers): We should consider still sending the touch events to |
| // main asynchronously (crbug.com/455539). |
| return DID_NOT_HANDLE; |
| } |
| } |
| return DROP_EVENT; |
| } |
| |
| bool InputHandlerProxy::FilterInputEventForFlingBoosting( |
| const WebInputEvent& event) { |
| if (!WebInputEvent::isGestureEventType(event.type)) |
| return false; |
| |
| if (!fling_curve_) { |
| DCHECK(!deferred_fling_cancel_time_seconds_); |
| return false; |
| } |
| |
| const WebGestureEvent& gesture_event = |
| static_cast<const WebGestureEvent&>(event); |
| if (gesture_event.type == WebInputEvent::GestureFlingCancel) { |
| if (gesture_event.data.flingCancel.preventBoosting) |
| return false; |
| |
| if (current_fling_velocity_.LengthSquared() < kMinBoostFlingSpeedSquare) |
| return false; |
| |
| TRACE_EVENT_INSTANT0("input", |
| "InputHandlerProxy::FlingBoostStart", |
| TRACE_EVENT_SCOPE_THREAD); |
| deferred_fling_cancel_time_seconds_ = |
| event.timeStampSeconds + kFlingBoostTimeoutDelaySeconds; |
| return true; |
| } |
| |
| // A fling is either inactive or is "free spinning", i.e., has yet to be |
| // interrupted by a touch gesture, in which case there is nothing to filter. |
| if (!deferred_fling_cancel_time_seconds_) |
| return false; |
| |
| // Gestures from a different source should immediately interrupt the fling. |
| if (gesture_event.sourceDevice != fling_parameters_.sourceDevice) { |
| CancelCurrentFling(); |
| return false; |
| } |
| |
| switch (gesture_event.type) { |
| case WebInputEvent::GestureTapCancel: |
| case WebInputEvent::GestureTapDown: |
| return false; |
| |
| case WebInputEvent::GestureScrollBegin: |
| if (!input_handler_->IsCurrentlyScrollingLayerAt( |
| gfx::Point(gesture_event.x, gesture_event.y), |
| fling_parameters_.sourceDevice == blink::WebGestureDeviceTouchpad |
| ? cc::InputHandler::NonBubblingGesture |
| : cc::InputHandler::Gesture)) { |
| CancelCurrentFling(); |
| return false; |
| } |
| |
| // TODO(jdduke): Use |gesture_event.data.scrollBegin.delta{X,Y}Hint| to |
| // determine if the ScrollBegin should immediately cancel the fling. |
| ExtendBoostedFlingTimeout(gesture_event); |
| return true; |
| |
| case WebInputEvent::GestureScrollUpdate: { |
| const double time_since_last_boost_event = |
| event.timeStampSeconds - last_fling_boost_event_.timeStampSeconds; |
| if (ShouldSuppressScrollForFlingBoosting(current_fling_velocity_, |
| gesture_event, |
| time_since_last_boost_event)) { |
| ExtendBoostedFlingTimeout(gesture_event); |
| return true; |
| } |
| |
| CancelCurrentFling(); |
| return false; |
| } |
| |
| case WebInputEvent::GestureScrollEnd: |
| // Clear the last fling boost event *prior* to fling cancellation, |
| // preventing insertion of a synthetic GestureScrollBegin. |
| last_fling_boost_event_ = WebGestureEvent(); |
| CancelCurrentFling(); |
| return true; |
| |
| case WebInputEvent::GestureFlingStart: { |
| DCHECK_EQ(fling_parameters_.sourceDevice, gesture_event.sourceDevice); |
| |
| bool fling_boosted = |
| fling_parameters_.modifiers == gesture_event.modifiers && |
| ShouldBoostFling(current_fling_velocity_, gesture_event); |
| |
| gfx::Vector2dF new_fling_velocity( |
| gesture_event.data.flingStart.velocityX, |
| gesture_event.data.flingStart.velocityY); |
| DCHECK(!new_fling_velocity.IsZero()); |
| |
| if (fling_boosted) |
| current_fling_velocity_ += new_fling_velocity; |
| else |
| current_fling_velocity_ = new_fling_velocity; |
| |
| WebFloatPoint velocity(current_fling_velocity_.x(), |
| current_fling_velocity_.y()); |
| deferred_fling_cancel_time_seconds_ = 0; |
| disallow_horizontal_fling_scroll_ = !velocity.x; |
| disallow_vertical_fling_scroll_ = !velocity.y; |
| last_fling_boost_event_ = WebGestureEvent(); |
| fling_curve_.reset(client_->CreateFlingAnimationCurve( |
| gesture_event.sourceDevice, |
| velocity, |
| blink::WebSize())); |
| fling_parameters_.startTime = gesture_event.timeStampSeconds; |
| fling_parameters_.delta = velocity; |
| fling_parameters_.point = WebPoint(gesture_event.x, gesture_event.y); |
| fling_parameters_.globalPoint = |
| WebPoint(gesture_event.globalX, gesture_event.globalY); |
| |
| TRACE_EVENT_INSTANT2("input", |
| fling_boosted ? "InputHandlerProxy::FlingBoosted" |
| : "InputHandlerProxy::FlingReplaced", |
| TRACE_EVENT_SCOPE_THREAD, |
| "vx", |
| current_fling_velocity_.x(), |
| "vy", |
| current_fling_velocity_.y()); |
| |
| // The client expects balanced calls between a consumed GestureFlingStart |
| // and |DidStopFlinging()|. TODO(jdduke): Provide a count parameter to |
| // |DidStopFlinging()| and only send after the accumulated fling ends. |
| client_->DidStopFlinging(); |
| return true; |
| } |
| |
| default: |
| // All other types of gestures (taps, presses, etc...) will complete the |
| // deferred fling cancellation. |
| CancelCurrentFling(); |
| return false; |
| } |
| } |
| |
| void InputHandlerProxy::ExtendBoostedFlingTimeout( |
| const blink::WebGestureEvent& event) { |
| TRACE_EVENT_INSTANT0("input", |
| "InputHandlerProxy::ExtendBoostedFlingTimeout", |
| TRACE_EVENT_SCOPE_THREAD); |
| deferred_fling_cancel_time_seconds_ = |
| event.timeStampSeconds + kFlingBoostTimeoutDelaySeconds; |
| last_fling_boost_event_ = event; |
| } |
| |
| void InputHandlerProxy::Animate(base::TimeTicks time) { |
| if (scroll_elasticity_controller_) |
| scroll_elasticity_controller_->Animate(time); |
| |
| if (!fling_curve_) |
| return; |
| |
| double monotonic_time_sec = InSecondsF(time); |
| |
| if (deferred_fling_cancel_time_seconds_ && |
| monotonic_time_sec > deferred_fling_cancel_time_seconds_) { |
| CancelCurrentFling(); |
| return; |
| } |
| |
| client_->DidAnimateForInput(); |
| |
| if (!has_fling_animation_started_) { |
| has_fling_animation_started_ = true; |
| // Guard against invalid, future or sufficiently stale start times, as there |
| // are no guarantees fling event and animation timestamps are compatible. |
| if (!fling_parameters_.startTime || |
| monotonic_time_sec <= fling_parameters_.startTime || |
| monotonic_time_sec >= fling_parameters_.startTime + |
| kMaxSecondsFromFlingTimestampToFirstAnimate) { |
| fling_parameters_.startTime = monotonic_time_sec; |
| input_handler_->SetNeedsAnimate(); |
| return; |
| } |
| } |
| |
| bool fling_is_active = |
| fling_curve_->apply(monotonic_time_sec - fling_parameters_.startTime, |
| this); |
| |
| if (disallow_vertical_fling_scroll_ && disallow_horizontal_fling_scroll_) |
| fling_is_active = false; |
| |
| if (fling_is_active) { |
| input_handler_->SetNeedsAnimate(); |
| } else { |
| TRACE_EVENT_INSTANT0("input", |
| "InputHandlerProxy::animate::flingOver", |
| TRACE_EVENT_SCOPE_THREAD); |
| CancelCurrentFling(); |
| } |
| } |
| |
| void InputHandlerProxy::MainThreadHasStoppedFlinging() { |
| fling_may_be_active_on_main_thread_ = false; |
| client_->DidStopFlinging(); |
| } |
| |
| void InputHandlerProxy::ReconcileElasticOverscrollAndRootScroll() { |
| if (scroll_elasticity_controller_) |
| scroll_elasticity_controller_->ReconcileStretchAndScroll(); |
| } |
| |
| void InputHandlerProxy::HandleOverscroll( |
| const gfx::Point& causal_event_viewport_point, |
| const cc::InputHandlerScrollResult& scroll_result) { |
| DCHECK(client_); |
| if (!scroll_result.did_overscroll_root) |
| return; |
| |
| TRACE_EVENT2("input", |
| "InputHandlerProxy::DidOverscroll", |
| "dx", |
| scroll_result.unused_scroll_delta.x(), |
| "dy", |
| scroll_result.unused_scroll_delta.y()); |
| |
| DidOverscrollParams params; |
| params.accumulated_overscroll = scroll_result.accumulated_root_overscroll; |
| params.latest_overscroll_delta = scroll_result.unused_scroll_delta; |
| params.current_fling_velocity = |
| ToClientScrollIncrement(current_fling_velocity_); |
| params.causal_event_viewport_point = causal_event_viewport_point; |
| |
| if (fling_curve_) { |
| static const int kFlingOverscrollThreshold = 1; |
| disallow_horizontal_fling_scroll_ |= |
| std::abs(params.accumulated_overscroll.x()) >= |
| kFlingOverscrollThreshold; |
| disallow_vertical_fling_scroll_ |= |
| std::abs(params.accumulated_overscroll.y()) >= |
| kFlingOverscrollThreshold; |
| } |
| |
| client_->DidOverscroll(params); |
| } |
| |
| bool InputHandlerProxy::CancelCurrentFling() { |
| if (CancelCurrentFlingWithoutNotifyingClient()) { |
| client_->DidStopFlinging(); |
| return true; |
| } |
| return false; |
| } |
| |
| bool InputHandlerProxy::CancelCurrentFlingWithoutNotifyingClient() { |
| bool had_fling_animation = fling_curve_; |
| if (had_fling_animation && |
| fling_parameters_.sourceDevice == blink::WebGestureDeviceTouchscreen) { |
| input_handler_->ScrollEnd(); |
| TRACE_EVENT_ASYNC_END0( |
| "input", |
| "InputHandlerProxy::HandleGestureFling::started", |
| this); |
| } |
| |
| TRACE_EVENT_INSTANT1("input", |
| "InputHandlerProxy::CancelCurrentFling", |
| TRACE_EVENT_SCOPE_THREAD, |
| "had_fling_animation", |
| had_fling_animation); |
| fling_curve_.reset(); |
| has_fling_animation_started_ = false; |
| gesture_scroll_on_impl_thread_ = false; |
| current_fling_velocity_ = gfx::Vector2dF(); |
| fling_parameters_ = blink::WebActiveWheelFlingParameters(); |
| |
| if (deferred_fling_cancel_time_seconds_) { |
| deferred_fling_cancel_time_seconds_ = 0; |
| |
| WebGestureEvent last_fling_boost_event = last_fling_boost_event_; |
| last_fling_boost_event_ = WebGestureEvent(); |
| if (last_fling_boost_event.type == WebInputEvent::GestureScrollBegin || |
| last_fling_boost_event.type == WebInputEvent::GestureScrollUpdate) { |
| // Synthesize a GestureScrollBegin, as the original was suppressed. |
| HandleInputEvent(ObtainGestureScrollBegin(last_fling_boost_event)); |
| } |
| } |
| |
| return had_fling_animation; |
| } |
| |
| bool InputHandlerProxy::TouchpadFlingScroll( |
| const WebFloatSize& increment) { |
| WebMouseWheelEvent synthetic_wheel; |
| synthetic_wheel.type = WebInputEvent::MouseWheel; |
| synthetic_wheel.deltaX = increment.width; |
| synthetic_wheel.deltaY = increment.height; |
| synthetic_wheel.hasPreciseScrollingDeltas = true; |
| synthetic_wheel.x = fling_parameters_.point.x; |
| synthetic_wheel.y = fling_parameters_.point.y; |
| synthetic_wheel.globalX = fling_parameters_.globalPoint.x; |
| synthetic_wheel.globalY = fling_parameters_.globalPoint.y; |
| synthetic_wheel.modifiers = fling_parameters_.modifiers; |
| |
| InputHandlerProxy::EventDisposition disposition = |
| HandleInputEvent(synthetic_wheel); |
| switch (disposition) { |
| case DID_HANDLE: |
| return true; |
| case DROP_EVENT: |
| break; |
| case DID_NOT_HANDLE: |
| TRACE_EVENT_INSTANT0("input", |
| "InputHandlerProxy::scrollBy::AbortFling", |
| TRACE_EVENT_SCOPE_THREAD); |
| // If we got a DID_NOT_HANDLE, that means we need to deliver wheels on the |
| // main thread. In this case we need to schedule a commit and transfer the |
| // fling curve over to the main thread and run the rest of the wheels from |
| // there. This can happen when flinging a page that contains a scrollable |
| // subarea that we can't scroll on the thread if the fling starts outside |
| // the subarea but then is flung "under" the pointer. |
| client_->TransferActiveWheelFlingAnimation(fling_parameters_); |
| fling_may_be_active_on_main_thread_ = true; |
| CancelCurrentFlingWithoutNotifyingClient(); |
| break; |
| } |
| |
| return false; |
| } |
| |
| bool InputHandlerProxy::scrollBy(const WebFloatSize& increment, |
| const WebFloatSize& velocity) { |
| WebFloatSize clipped_increment; |
| WebFloatSize clipped_velocity; |
| if (!disallow_horizontal_fling_scroll_) { |
| clipped_increment.width = increment.width; |
| clipped_velocity.width = velocity.width; |
| } |
| if (!disallow_vertical_fling_scroll_) { |
| clipped_increment.height = increment.height; |
| clipped_velocity.height = velocity.height; |
| } |
| |
| current_fling_velocity_ = clipped_velocity; |
| |
| // Early out if the increment is zero, but avoid early terimination if the |
| // velocity is still non-zero. |
| if (clipped_increment == WebFloatSize()) |
| return clipped_velocity != WebFloatSize(); |
| |
| TRACE_EVENT2("input", |
| "InputHandlerProxy::scrollBy", |
| "x", |
| clipped_increment.width, |
| "y", |
| clipped_increment.height); |
| |
| bool did_scroll = false; |
| |
| switch (fling_parameters_.sourceDevice) { |
| case blink::WebGestureDeviceTouchpad: |
| did_scroll = TouchpadFlingScroll(clipped_increment); |
| break; |
| case blink::WebGestureDeviceTouchscreen: { |
| clipped_increment = ToClientScrollIncrement(clipped_increment); |
| cc::InputHandlerScrollResult scroll_result = input_handler_->ScrollBy( |
| fling_parameters_.point, clipped_increment); |
| HandleOverscroll(fling_parameters_.point, scroll_result); |
| did_scroll = scroll_result.did_scroll; |
| } break; |
| } |
| |
| if (did_scroll) { |
| fling_parameters_.cumulativeScroll.width += clipped_increment.width; |
| fling_parameters_.cumulativeScroll.height += clipped_increment.height; |
| } |
| |
| // It's possible the provided |increment| is sufficiently small as to not |
| // trigger a scroll, e.g., with a trivial time delta between fling updates. |
| // Return true in this case to prevent early fling termination. |
| if (std::abs(clipped_increment.width) < kScrollEpsilon && |
| std::abs(clipped_increment.height) < kScrollEpsilon) |
| return true; |
| |
| return did_scroll; |
| } |
| |
| } // namespace content |
