| // Copyright 2017 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/touch_timeout_handler.h" |
| |
| #include <utility> |
| |
| #include "base/auto_reset.h" |
| #include "base/bind.h" |
| #include "base/macros.h" |
| #include "base/metrics/histogram_macros.h" |
| #include "base/trace_event/trace_event.h" |
| #include "content/browser/renderer_host/input/passthrough_touch_event_queue.h" |
| #include "content/common/input/web_touch_event_traits.h" |
| #include "ui/events/base_event_utils.h" |
| #include "ui/gfx/geometry/point_f.h" |
| |
| using blink::WebInputEvent; |
| using blink::WebTouchEvent; |
| using blink::WebTouchPoint; |
| using ui::LatencyInfo; |
| |
| namespace content { |
| namespace { |
| |
| bool ShouldTouchTriggerTimeout(const WebTouchEvent& event) { |
| return (event.GetType() == WebInputEvent::kTouchStart || |
| event.GetType() == WebInputEvent::kTouchMove) && |
| event.dispatch_type == WebInputEvent::kBlocking; |
| } |
| |
| } // namespace |
| |
| TouchTimeoutHandler::TouchTimeoutHandler( |
| PassthroughTouchEventQueue* touch_queue, |
| base::TimeDelta desktop_timeout_delay, |
| base::TimeDelta mobile_timeout_delay) |
| : touch_queue_(touch_queue), |
| desktop_timeout_delay_(desktop_timeout_delay), |
| mobile_timeout_delay_(mobile_timeout_delay), |
| use_mobile_timeout_(false), |
| pending_ack_state_(PENDING_ACK_NONE), |
| timeout_monitor_( |
| base::Bind(&TouchTimeoutHandler::OnTimeOut, base::Unretained(this))), |
| enabled_(true), |
| enabled_for_current_sequence_(false), |
| sequence_awaiting_uma_update_(false), |
| sequence_using_mobile_timeout_(false) { |
| SetUseMobileTimeout(false); |
| } |
| |
| TouchTimeoutHandler::~TouchTimeoutHandler() { |
| LogSequenceEndForUMAIfNecessary(false); |
| } |
| |
| void TouchTimeoutHandler::StartIfNecessary( |
| const TouchEventWithLatencyInfo& event) { |
| if (pending_ack_state_ != PENDING_ACK_NONE) |
| return; |
| |
| if (!enabled_) |
| return; |
| |
| const base::TimeDelta timeout_delay = GetTimeoutDelay(); |
| if (timeout_delay.is_zero()) |
| return; |
| |
| if (!ShouldTouchTriggerTimeout(event.event)) |
| return; |
| |
| if (WebTouchEventTraits::IsTouchSequenceStart(event.event)) { |
| LogSequenceStartForUMA(); |
| enabled_for_current_sequence_ = true; |
| } |
| |
| if (!enabled_for_current_sequence_) |
| return; |
| |
| timeout_event_ = event; |
| timeout_monitor_.Restart(timeout_delay); |
| } |
| |
| bool TouchTimeoutHandler::ConfirmTouchEvent(uint32_t unique_touch_event_id, |
| InputEventAckState ack_result, |
| bool should_stop_timeout_monitor) { |
| if (timeout_event_.event.unique_touch_event_id != unique_touch_event_id) |
| return false; |
| |
| switch (pending_ack_state_) { |
| case PENDING_ACK_NONE: |
| if (ack_result == INPUT_EVENT_ACK_STATE_CONSUMED) |
| enabled_for_current_sequence_ = false; |
| if (should_stop_timeout_monitor) |
| timeout_monitor_.Stop(); |
| return false; |
| case PENDING_ACK_ORIGINAL_EVENT: |
| if (AckedTimeoutEventRequiresCancel(ack_result)) { |
| SetPendingAckState(PENDING_ACK_CANCEL_EVENT); |
| touch_queue_->SendTouchCancelEventForTouchEvent(timeout_event_); |
| } else { |
| SetPendingAckState(PENDING_ACK_NONE); |
| touch_queue_->UpdateTouchConsumerStates(timeout_event_.event, |
| ack_result); |
| } |
| return true; |
| case PENDING_ACK_CANCEL_EVENT: |
| SetPendingAckState(PENDING_ACK_NONE); |
| return true; |
| } |
| return false; |
| } |
| |
| bool TouchTimeoutHandler::FilterEvent(const WebTouchEvent& event) { |
| if (!HasTimeoutEvent()) |
| return false; |
| |
| if (WebTouchEventTraits::IsTouchSequenceStart(event)) { |
| // If a new sequence is observed while we're still waiting on the |
| // timed-out sequence response, also count the new sequence as timed-out. |
| LogSequenceStartForUMA(); |
| LogSequenceEndForUMAIfNecessary(true); |
| } |
| |
| return true; |
| } |
| |
| void TouchTimeoutHandler::StopTimeoutMonitor() { |
| timeout_monitor_.Stop(); |
| } |
| |
| void TouchTimeoutHandler::SetEnabled(bool enabled) { |
| if (enabled_ == enabled) |
| return; |
| |
| enabled_ = enabled; |
| |
| if (enabled_) |
| return; |
| |
| enabled_for_current_sequence_ = false; |
| // Only reset the |timeout_handler_| if the timer is running and has not |
| // yet timed out. This ensures that an already timed out sequence is |
| // properly flushed by the handler. |
| if (IsTimeoutTimerRunning()) { |
| pending_ack_state_ = PENDING_ACK_NONE; |
| timeout_monitor_.Stop(); |
| } |
| } |
| |
| void TouchTimeoutHandler::SetUseMobileTimeout(bool use_mobile_timeout) { |
| use_mobile_timeout_ = use_mobile_timeout; |
| } |
| |
| void TouchTimeoutHandler::OnTimeOut() { |
| LogSequenceEndForUMAIfNecessary(true); |
| SetPendingAckState(PENDING_ACK_ORIGINAL_EVENT); |
| touch_queue_->FlushQueue(); |
| } |
| |
| // Skip a cancel event if the timed-out event had no consumer and was the |
| // initial event in the gesture. |
| bool TouchTimeoutHandler::AckedTimeoutEventRequiresCancel( |
| InputEventAckState ack_result) const { |
| DCHECK(HasTimeoutEvent()); |
| if (ack_result != INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS) |
| return true; |
| return !WebTouchEventTraits::IsTouchSequenceStart(timeout_event_.event); |
| } |
| |
| void TouchTimeoutHandler::SetPendingAckState( |
| PendingAckState new_pending_ack_state) { |
| DCHECK_NE(pending_ack_state_, new_pending_ack_state); |
| switch (new_pending_ack_state) { |
| case PENDING_ACK_ORIGINAL_EVENT: |
| DCHECK_EQ(pending_ack_state_, PENDING_ACK_NONE); |
| TRACE_EVENT_ASYNC_BEGIN0("input", "TouchEventTimeout", this); |
| break; |
| case PENDING_ACK_CANCEL_EVENT: |
| DCHECK_EQ(pending_ack_state_, PENDING_ACK_ORIGINAL_EVENT); |
| DCHECK(!timeout_monitor_.IsRunning()); |
| DCHECK(touch_queue_->Empty()); |
| TRACE_EVENT_ASYNC_STEP_INTO0("input", "TouchEventTimeout", this, |
| "CancelEvent"); |
| break; |
| case PENDING_ACK_NONE: |
| DCHECK(!timeout_monitor_.IsRunning()); |
| DCHECK(touch_queue_->Empty()); |
| TRACE_EVENT_ASYNC_END0("input", "TouchEventTimeout", this); |
| break; |
| } |
| pending_ack_state_ = new_pending_ack_state; |
| } |
| |
| void TouchTimeoutHandler::LogSequenceStartForUMA() { |
| // Always flush any unlogged entries before starting a new one. |
| LogSequenceEndForUMAIfNecessary(false); |
| sequence_awaiting_uma_update_ = true; |
| sequence_using_mobile_timeout_ = use_mobile_timeout_; |
| } |
| |
| void TouchTimeoutHandler::LogSequenceEndForUMAIfNecessary(bool timed_out) { |
| if (!sequence_awaiting_uma_update_) |
| return; |
| |
| sequence_awaiting_uma_update_ = false; |
| |
| if (sequence_using_mobile_timeout_) { |
| UMA_HISTOGRAM_BOOLEAN("Event.Touch.TimedOutOnMobileSite", timed_out); |
| } else { |
| UMA_HISTOGRAM_BOOLEAN("Event.Touch.TimedOutOnDesktopSite", timed_out); |
| } |
| } |
| |
| base::TimeDelta TouchTimeoutHandler::GetTimeoutDelay() const { |
| return use_mobile_timeout_ ? mobile_timeout_delay_ : desktop_timeout_delay_; |
| } |
| |
| bool TouchTimeoutHandler::HasTimeoutEvent() const { |
| return pending_ack_state_ != PENDING_ACK_NONE; |
| } |
| |
| } // namespace content |