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// Copyright 2020 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/visibility_timer_tab_helper.h"
#include <utility>
#include "base/functional/callback_helpers.h"
#include "base/logging.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "content/public/browser/visibility.h"
#include "content/public/browser/web_contents.h"
WEB_CONTENTS_USER_DATA_KEY_IMPL(VisibilityTimerTabHelper);
struct VisibilityTimerTabHelper::Task {
base::TimeDelta visible_delay;
base::Location from_here;
base::OnceClosure task;
};
VisibilityTimerTabHelper::~VisibilityTimerTabHelper() = default;
void VisibilityTimerTabHelper::PostTaskAfterVisibleDelay(
const base::Location& from_here,
base::OnceClosure task,
base::TimeDelta visible_delay) {
if (web_contents()->IsBeingDestroyed())
return;
task_queue_.push_back({visible_delay, from_here, std::move(task)});
if (web_contents()->GetVisibility() == content::Visibility::VISIBLE &&
task_queue_.size() == 1) {
StartNextTaskTimer();
}
}
void VisibilityTimerTabHelper::OnVisibilityChanged(
content::Visibility visibility) {
if (!task_queue_.empty()) {
if (visibility == content::Visibility::VISIBLE)
StartNextTaskTimer();
else
timer_.Stop();
}
}
VisibilityTimerTabHelper::VisibilityTimerTabHelper(
content::WebContents* contents)
: content::WebContentsObserver(contents),
content::WebContentsUserData<VisibilityTimerTabHelper>(*contents) {}
void VisibilityTimerTabHelper::RunTask(base::OnceClosure task) {
DCHECK_EQ(web_contents()->GetVisibility(), content::Visibility::VISIBLE);
task_queue_.pop_front();
if (!task_queue_.empty())
StartNextTaskTimer();
std::move(task).Run();
}
void VisibilityTimerTabHelper::StartNextTaskTimer() {
Task& task = task_queue_.front();
DCHECK(task.task);
// Split the callback, as we might need to use it again if the timer is
// stopped.
auto callback_pair = base::SplitOnceCallback(std::move(task.task));
task.task = std::move(callback_pair.first);
// Safe to use Unretained, as destroying |this| will destroy timer_,
// hence cancelling the callback.
timer_.Start(
task.from_here, task.visible_delay,
base::BindOnce(&VisibilityTimerTabHelper::RunTask, base::Unretained(this),
std::move(callback_pair.second)));
}
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