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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_UI_VIEWS_WEB_APPS_ISOLATED_WEB_APPS_CALLBACK_DELAYER_H_
#define CHROME_BROWSER_UI_VIEWS_WEB_APPS_ISOLATED_WEB_APPS_CALLBACK_DELAYER_H_
#include <memory>
#include "base/functional/callback.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
namespace web_app {
class Stopwatch;
// Buffers the execution of a callback until a minimum amount of time has
// passed, pausing the timer at a configurable percentage if the incoming
// callback hasn't been invoked. A progress update callback will be invoked at
// 60hz while the timer is running.
//
// Usage example:
// CallbackDelayer delayer(base::Seconds(3), 0.8,
// base::BindOnce(&UpdateProgressBar, ...));
// long_task->Run(delayer.StartDelayingCallback(
// base::BindOnce(&OnLongTaskComplete, ...)));
class CallbackDelayer {
public:
CallbackDelayer(base::TimeDelta duration,
double progress_pause_percentage,
base::RepeatingCallback<void(double)> progress_callback);
~CallbackDelayer();
// Starts the timer and returns a callback that, when run, will result in
// |callback| being run after the configured delay has been reached, and
// will unpause the timer if necessary.
template <typename... Args>
base::OnceCallback<void(Args...)> StartDelayingCallback(
base::OnceCallback<void(Args...)> callback) {
CHECK(!started_);
started_ = true;
StartTimer();
return base::BindOnce(&CallbackDelayer::BindArguments<Args...>,
weak_ptr_factory_.GetWeakPtr(), std::move(callback));
}
private:
template <typename... Args>
void BindArguments(base::OnceCallback<void(Args...)> callback, Args... args) {
complete_callback_ = base::BindOnce(std::move(callback), args...);
StartTimer();
}
void StartTimer();
void OnTimerTick();
base::TimeDelta duration_;
double progress_pause_percentage_;
base::RepeatingCallback<void(double)> progress_callback_;
bool started_ = false;
std::unique_ptr<Stopwatch> stopwatch_;
base::OnceClosure complete_callback_;
base::RepeatingTimer repeating_timer_;
base::WeakPtrFactory<CallbackDelayer> weak_ptr_factory_{this};
};
} // namespace web_app
#endif // CHROME_BROWSER_UI_VIEWS_WEB_APPS_ISOLATED_WEB_APPS_CALLBACK_DELAYER_H_
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