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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/base/idle/idle_polling_service.h"
#include "base/no_destructor.h"
#include "base/observer_list.h"
#include "base/task/sequenced_task_runner.h"
#include "ui/base/idle/idle.h"
#include "ui/base/idle/idle_time_provider.h"
namespace ui {
namespace {
// Default provider implementation. Everything is delegated to
// ui::CalculateIdleTime and ui::CheckIdleStateIsLocked.
class DefaultIdleProvider : public IdleTimeProvider {
public:
DefaultIdleProvider() = default;
~DefaultIdleProvider() override = default;
base::TimeDelta CalculateIdleTime() override {
return base::Seconds(ui::CalculateIdleTime());
}
bool CheckIdleStateIsLocked() override {
return ui::CheckIdleStateIsLocked();
}
};
} // namespace
// static
IdlePollingService* IdlePollingService::GetInstance() {
static base::NoDestructor<IdlePollingService> instance;
return instance.get();
}
const IdlePollingService::State& IdlePollingService::GetIdleState() {
// |last_state_| won't be valid if we aren't polling.
DCHECK(timer_.IsRunning());
return last_state_;
}
void IdlePollingService::AddObserver(Observer* observer) {
// Fetch the current state and start polling if this was the first observer.
if (observers_.empty()) {
DCHECK(!timer_.IsRunning());
PollIdleState();
timer_.Start(FROM_HERE, poll_interval_,
base::BindRepeating(&IdlePollingService::PollIdleState,
base::Unretained(this)));
}
observers_.AddObserver(observer);
}
void IdlePollingService::RemoveObserver(Observer* observer) {
DCHECK(timer_.IsRunning());
observers_.RemoveObserver(observer);
// Stop polling when there are no observers to save resources.
if (observers_.empty()) {
timer_.Stop();
}
}
void IdlePollingService::SetProviderForTest(
std::unique_ptr<IdleTimeProvider> provider) {
provider_ = std::move(provider);
if (!provider_) {
provider_ = std::make_unique<DefaultIdleProvider>();
}
}
void IdlePollingService::SetPollIntervalForTest(base::TimeDelta poll_interval) {
DCHECK(!timer_.IsRunning());
poll_interval_ = poll_interval;
}
bool IdlePollingService::IsPollingForTest() {
return timer_.IsRunning();
}
void IdlePollingService::SetTaskRunnerForTest(
scoped_refptr<base::SequencedTaskRunner> task_runner) {
timer_.SetTaskRunner(std::move(task_runner));
}
IdlePollingService::IdlePollingService()
: poll_interval_(kPollInterval),
provider_(std::make_unique<DefaultIdleProvider>()) {
DCHECK(!timer_.IsRunning());
}
IdlePollingService::~IdlePollingService() = default;
IdlePollingService::State IdlePollingService::CreateCurrentIdleState() const {
return {
.locked = provider_->CheckIdleStateIsLocked(),
.idle_time = provider_->CalculateIdleTime(),
};
}
void IdlePollingService::PollIdleState() {
if (auto cur_state = CreateCurrentIdleState(); cur_state != last_state_) {
last_state_ = std::move(cur_state);
observers_.Notify(&Observer::OnIdleStateChange, last_state_);
}
}
} // namespace ui
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