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| 1 // Copyright 2017 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 #include "content/browser/renderer_host/mouse_wheel_phase_handler.h" |
| 6 |
| 7 #include "content/browser/renderer_host/render_widget_host_input_event_router.h" |
| 8 |
| 9 namespace content { |
| 10 MouseWheelPhaseHandler::MouseWheelPhaseHandler( |
| 11 RenderWidgetHostImpl* host, |
| 12 RenderWidgetHostViewBase* host_view) |
| 13 : host_(RenderWidgetHostImpl::From(host)), host_view_(host_view) {} |
| 14 |
| 15 void MouseWheelPhaseHandler::AddPhaseIfNeededAndScheduleEndEvent( |
| 16 blink::WebMouseWheelEvent& mouse_wheel_event, |
| 17 bool should_route_event) { |
| 18 bool has_phase = |
| 19 mouse_wheel_event.phase != blink::WebMouseWheelEvent::kPhaseNone || |
| 20 mouse_wheel_event.momentum_phase != blink::WebMouseWheelEvent::kPhaseNone; |
| 21 if (has_phase) { |
| 22 if (mouse_wheel_event.phase == blink::WebMouseWheelEvent::kPhaseEnded) { |
| 23 // Don't send the wheel end event immediately, start a timer instead to |
| 24 // see whether momentum phase of the scrolling starts or not. |
| 25 ScheduleMouseWheelEndDispatching(mouse_wheel_event, should_route_event); |
| 26 } else if (mouse_wheel_event.phase == |
| 27 blink::WebMouseWheelEvent::kPhaseBegan) { |
| 28 // A new scrolling sequence has started, send the pending wheel end |
| 29 // event to end the previous scrolling sequence. |
| 30 DispatchPendingWheelEndEvent(); |
| 31 } else if (mouse_wheel_event.momentum_phase == |
| 32 blink::WebMouseWheelEvent::kPhaseBegan) { |
| 33 // Momentum phase has started, drop the pending wheel end event to make |
| 34 // sure that no wheel end event will be sent during the momentum phase |
| 35 // of scrolling. |
| 36 IgnorePendingWheelEndEvent(); |
| 37 } |
| 38 } else { // !has_phase |
| 39 if (!mouse_wheel_end_dispatch_timer_.IsRunning()) { |
| 40 mouse_wheel_event.phase = blink::WebMouseWheelEvent::kPhaseBegan; |
| 41 ScheduleMouseWheelEndDispatching(mouse_wheel_event, should_route_event); |
| 42 } else { // mouse_wheel_end_dispatch_timer_.IsRunning() |
| 43 bool non_zero_delta = |
| 44 mouse_wheel_event.delta_x || mouse_wheel_event.delta_y; |
| 45 mouse_wheel_event.phase = |
| 46 non_zero_delta ? blink::WebMouseWheelEvent::kPhaseChanged |
| 47 : blink::WebMouseWheelEvent::kPhaseStationary; |
| 48 mouse_wheel_end_dispatch_timer_.Reset(); |
| 49 } |
| 50 } |
| 51 } |
| 52 |
| 53 void MouseWheelPhaseHandler::DispatchPendingWheelEndEvent() { |
| 54 if (!mouse_wheel_end_dispatch_timer_.IsRunning()) |
| 55 return; |
| 56 |
| 57 base::Closure task = mouse_wheel_end_dispatch_timer_.user_task(); |
| 58 mouse_wheel_end_dispatch_timer_.Stop(); |
| 59 task.Run(); |
| 60 } |
| 61 |
| 62 void MouseWheelPhaseHandler::IgnorePendingWheelEndEvent() { |
| 63 mouse_wheel_end_dispatch_timer_.Stop(); |
| 64 } |
| 65 |
| 66 void MouseWheelPhaseHandler::SendSyntheticWheelEventWithPhaseEnded( |
| 67 blink::WebMouseWheelEvent last_mouse_wheel_event, |
| 68 bool should_route_event) { |
| 69 DCHECK(host_view_->wheel_scroll_latching_enabled()); |
| 70 blink::WebMouseWheelEvent mouse_wheel_event = last_mouse_wheel_event; |
| 71 mouse_wheel_event.delta_x = 0; |
| 72 mouse_wheel_event.delta_y = 0; |
| 73 mouse_wheel_event.phase = blink::WebMouseWheelEvent::kPhaseEnded; |
| 74 mouse_wheel_event.dispatch_type = |
| 75 blink::WebInputEvent::DispatchType::kEventNonBlocking; |
| 76 if (should_route_event) { |
| 77 host_->delegate()->GetInputEventRouter()->RouteMouseWheelEvent( |
| 78 host_view_, &mouse_wheel_event, |
| 79 ui::LatencyInfo(ui::SourceEventType::WHEEL)); |
| 80 } else { |
| 81 host_view_->ProcessMouseWheelEvent( |
| 82 mouse_wheel_event, ui::LatencyInfo(ui::SourceEventType::WHEEL)); |
| 83 } |
| 84 } |
| 85 |
| 86 void MouseWheelPhaseHandler::ScheduleMouseWheelEndDispatching( |
| 87 blink::WebMouseWheelEvent wheel_event, |
| 88 bool should_route_event) { |
| 89 mouse_wheel_end_dispatch_timer_.Start( |
| 90 FROM_HERE, |
| 91 base::TimeDelta::FromMilliseconds( |
| 92 kDefaultMouseWheelLatchingTransactionMs), |
| 93 base::Bind(&MouseWheelPhaseHandler::SendSyntheticWheelEventWithPhaseEnded, |
| 94 base::Unretained(this), wheel_event, should_route_event)); |
| 95 } |
| 96 |
| 97 } // namespace content |
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