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// Copyright 2013 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_TIMEOUT_MONITOR_H_
#define COMPONENTS_INPUT_TIMEOUT_MONITOR_H_
#include "base/functional/callback.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "base/component_export.h"
namespace input {
// Utility class for handling a timeout callback with periodic starts and stops.
class COMPONENT_EXPORT(INPUT) TimeoutMonitor {
public:
typedef base::RepeatingClosure TimeoutHandler;
// |task_runner| must run tasks on the same sequence which TimeoutMonitor is
// constructed on.
explicit TimeoutMonitor(const TimeoutHandler& timeout_handler,
scoped_refptr<base::SequencedTaskRunner> task_runner);
TimeoutMonitor(const TimeoutMonitor&) = delete;
TimeoutMonitor& operator=(const TimeoutMonitor&) = delete;
~TimeoutMonitor();
// Schedule the timeout timer to fire at |delay| into the future. If a timeout
// has already been scheduled, reschedule only if |delay| is sooner than the
// currently scheduled timeout time.
void Start(base::TimeDelta delay);
void Restart(base::TimeDelta delay);
void Stop();
bool IsRunning() const;
base::TimeDelta GetCurrentDelay();
private:
void StartImpl(base::TimeDelta delay);
void CheckTimedOut();
TimeoutHandler timeout_handler_;
// Indicates a time in the future when we would consider the input as
// having timed out, if it does not receive an appropriate stop request.
base::TimeTicks time_when_considered_timed_out_;
// This timer runs to check if |time_when_considered_timed_out_| has past.
base::OneShotTimer timeout_timer_;
};
} // namespace input
#endif // COMPONENTS_INPUT_TIMEOUT_MONITOR_H_
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