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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_INPUT_RENDER_INPUT_ROUTER_LATENCY_TRACKER_H_
#define COMPONENTS_INPUT_RENDER_INPUT_ROUTER_LATENCY_TRACKER_H_
#include <stdint.h>
#include "base/memory/raw_ptr.h"
#include "base/sequence_checker.h"
#include "components/input/event_with_latency_info.h"
#include "base/component_export.h"
#include "third_party/blink/public/mojom/input/input_event_result.mojom-shared.h"
#include "ui/latency/latency_info.h"
namespace input {
class RenderInputRouterDelegate;
// Utility class for tracking the latency of events passing through
// a given RenderWidgetHost.
class COMPONENT_EXPORT(INPUT) RenderInputRouterLatencyTracker {
public:
explicit RenderInputRouterLatencyTracker(RenderInputRouterDelegate* delegate);
RenderInputRouterLatencyTracker(const RenderInputRouterLatencyTracker&) =
delete;
RenderInputRouterLatencyTracker& operator=(
const RenderInputRouterLatencyTracker&) = delete;
virtual ~RenderInputRouterLatencyTracker();
// Sets `latency`'s `trace_id` field to the next global ID.
void OnEventStart(ui::LatencyInfo* latency);
// Populates the LatencyInfo with relevant entries for latency tracking.
// Called when an event is received by the RenderWidgetHost, prior to
// that event being forwarded to the renderer (via the InputRouter).
void OnInputEvent(const blink::WebInputEvent& event,
ui::LatencyInfo* latency,
ui::EventLatencyMetadata* event_latency_metadata);
// Populates the LatencyInfo with relevant entries for latency tracking, also
// terminating latency tracking for events that did not trigger rendering and
// performing relevant UMA latency reporting. Called when an event is ack'ed
// to the RenderWidgetHost (from the InputRouter).
void OnInputEventAck(const blink::WebInputEvent& event,
ui::LatencyInfo* latency,
blink::mojom::InputEventResultState ack_result);
void reset_delegate() { render_input_router_delegate_ = nullptr; }
private:
bool has_seen_first_gesture_scroll_update_ = false;
int64_t gesture_scroll_id_ = -1;
int64_t touch_trace_id_ = -1;
// Whether the current stream of touch events includes more than one active
// touch point. This is set in OnInputEvent, and cleared in OnInputEventAck.
bool active_multi_finger_gesture_;
// Whether the touch start for the current stream of touch events had its
// default action prevented. Only valid for single finger gestures.
bool touch_start_default_prevented_;
raw_ptr<RenderInputRouterDelegate> render_input_router_delegate_;
// This class expects to be constructed and used on the same sequence.
SEQUENCE_CHECKER(sequence_checker_);
};
} // namespace input
#endif // COMPONENTS_INPUT_RENDER_INPUT_ROUTER_LATENCY_TRACKER_H_
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