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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/memory/ptr_util.h"
#include "base/memory/raw_ptr.h"
#include "base/metrics/user_metrics.h"
#include "base/metrics/user_metrics_action.h"
#include "base/supports_user_data.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/sessions/tab_restore_service_factory.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_commands.h"
#include "chrome/browser/ui/browser_list.h"
#include "chrome/browser/ui/browser_list_observer.h"
#include "chrome/browser/ui/browser_live_tab_context.h"
#include "components/sessions/core/tab_restore_service.h"
#include "components/sessions/core/tab_restore_service_observer.h"
namespace chrome {
namespace {
const char kBrowserTabRestorerKey[] = "BrowserTabRestorer";
// BrowserTabRestorer is responsible for restoring a tab when the
// sessions::TabRestoreService finishes loading. A TabRestoreService is
// associated with a
// single Browser and deletes itself if the Browser is destroyed.
// BrowserTabRestorer is installed on the Profile (by way of user data), only
// one instance is created per profile at a time.
class BrowserTabRestorer : public sessions::TabRestoreServiceObserver,
public BrowserListObserver,
public base::SupportsUserData::Data {
public:
BrowserTabRestorer(const BrowserTabRestorer&) = delete;
BrowserTabRestorer& operator=(const BrowserTabRestorer&) = delete;
~BrowserTabRestorer() override;
static void CreateIfNecessary(Browser* browser);
private:
explicit BrowserTabRestorer(Browser* browser);
// TabRestoreServiceObserver:
void TabRestoreServiceDestroyed(
sessions::TabRestoreService* service) override;
void TabRestoreServiceLoaded(sessions::TabRestoreService* service) override;
// BrowserListObserver:
void OnBrowserRemoved(Browser* browser) override;
raw_ptr<Browser> browser_;
raw_ptr<sessions::TabRestoreService> tab_restore_service_;
};
BrowserTabRestorer::~BrowserTabRestorer() {
tab_restore_service_->RemoveObserver(this);
BrowserList::RemoveObserver(this);
}
// static
void BrowserTabRestorer::CreateIfNecessary(Browser* browser) {
DCHECK(browser);
if (browser->profile()->GetUserData(kBrowserTabRestorerKey)) {
return; // Only allow one restore for a given profile at a time.
}
// BrowserTabRestorer is deleted at the appropriate time.
new BrowserTabRestorer(browser);
}
BrowserTabRestorer::BrowserTabRestorer(Browser* browser)
: browser_(browser),
tab_restore_service_(
TabRestoreServiceFactory::GetForProfile(browser->profile())) {
DCHECK(tab_restore_service_);
DCHECK(!tab_restore_service_->IsLoaded());
tab_restore_service_->AddObserver(this);
BrowserList::AddObserver(this);
browser_->profile()->SetUserData(kBrowserTabRestorerKey,
base::WrapUnique(this));
tab_restore_service_->LoadTabsFromLastSession();
}
void BrowserTabRestorer::TabRestoreServiceDestroyed(
sessions::TabRestoreService* service) {}
void BrowserTabRestorer::TabRestoreServiceLoaded(
sessions::TabRestoreService* service) {
RestoreTab(browser_);
// This deletes us.
browser_->profile()->SetUserData(kBrowserTabRestorerKey, nullptr);
}
void BrowserTabRestorer::OnBrowserRemoved(Browser* browser) {
// This deletes us.
browser_->profile()->SetUserData(kBrowserTabRestorerKey, nullptr);
}
} // namespace
void RestoreTab(Browser* browser) {
base::RecordAction(base::UserMetricsAction("RestoreTab"));
sessions::TabRestoreService* service =
TabRestoreServiceFactory::GetForProfile(browser->profile());
if (!service) {
return;
}
if (service->IsLoaded()) {
service->RestoreMostRecentEntry(browser->live_tab_context());
return;
}
BrowserTabRestorer::CreateIfNecessary(browser);
}
} // namespace chrome
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