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// Copyright 2014 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.
#ifndef CONTENT_BROWSER_RENDERER_HOST_INPUT_RENDER_WIDGET_HOST_LATENCY_TRACKER_H_
#define CONTENT_BROWSER_RENDERER_HOST_INPUT_RENDER_WIDGET_HOST_LATENCY_TRACKER_H_
#include <stdint.h>
#include <vector>
#include "base/macros.h"
#include "content/browser/renderer_host/event_with_latency_info.h"
#include "content/common/content_export.h"
#include "content/public/common/input_event_ack_state.h"
#include "ui/latency/latency_info.h"
#include "ui/latency/latency_tracker.h"
namespace content {
class RenderWidgetHostDelegate;
// Utility class for tracking the latency of events passing through
// a given RenderWidgetHost.
class CONTENT_EXPORT RenderWidgetHostLatencyTracker {
public:
RenderWidgetHostLatencyTracker(RenderWidgetHostDelegate* delegate);
virtual ~RenderWidgetHostLatencyTracker();
// Associates the latency tracker with a given route and process.
// Called once after the RenderWidgetHost is fully initialized.
void Initialize(int routing_id, int process_id);
void ComputeInputLatencyHistograms(blink::WebInputEvent::Type type,
const ui::LatencyInfo& latency,
InputEventAckState ack_result);
// 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);
// 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,
InputEventAckState ack_result);
void reset_delegate() { render_widget_host_delegate_ = nullptr; }
private:
void OnEventStart(ui::LatencyInfo* latency);
bool has_seen_first_gesture_scroll_update_;
// 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_;
RenderWidgetHostDelegate* render_widget_host_delegate_;
DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostLatencyTracker);
};
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_INPUT_RENDER_WIDGET_HOST_LATENCY_TRACKER_H_
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