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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.
#include "chrome/browser/ui/views/web_apps/isolated_web_apps/callback_delayer.h"
#include <memory>
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/time/time.h"
#include "base/timer/elapsed_timer.h"
namespace web_app {
namespace {
constexpr int kRefreshRateHz = 60;
} // namespace
// A timer that can be paused and resumed.
class Stopwatch {
public:
Stopwatch() = default;
~Stopwatch() = default;
void Start() {
if (!timer_) {
timer_ = std::make_unique<base::ElapsedTimer>();
}
}
void Pause() {
if (!timer_) {
return;
}
previously_elapsed_ += timer_->Elapsed();
timer_.reset();
}
base::TimeDelta Elapsed() {
if (timer_) {
return previously_elapsed_ + timer_->Elapsed();
}
return previously_elapsed_;
}
private:
base::TimeDelta previously_elapsed_;
std::unique_ptr<base::ElapsedTimer> timer_;
};
CallbackDelayer::CallbackDelayer(
base::TimeDelta duration,
double progress_pause_percentage,
base::RepeatingCallback<void(double)> progress_callback)
: duration_(duration),
progress_pause_percentage_(progress_pause_percentage),
progress_callback_(progress_callback),
stopwatch_(std::make_unique<Stopwatch>()) {}
CallbackDelayer::~CallbackDelayer() = default;
void CallbackDelayer::StartTimer() {
stopwatch_->Start();
repeating_timer_.Start(FROM_HERE, base::Seconds(1) / kRefreshRateHz,
base::BindRepeating(&CallbackDelayer::OnTimerTick,
weak_ptr_factory_.GetWeakPtr()));
}
void CallbackDelayer::OnTimerTick() {
int64_t elapsed = stopwatch_->Elapsed().InMillisecondsRoundedUp();
double progress = elapsed / duration_.InMillisecondsF();
progress_callback_.Run(progress);
if (progress >= 1.0) {
CHECK(!complete_callback_.is_null());
repeating_timer_.Stop();
std::move(complete_callback_).Run();
return;
}
if (progress >= progress_pause_percentage_ && complete_callback_.is_null()) {
stopwatch_->Pause();
repeating_timer_.Stop();
}
}
} // namespace web_app
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