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- // Copyright (c) 2010 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include "components/prefs/pref_change_registrar.h"
- #include "base/bind.h"
- #include "base/check.h"
- #include "base/notreached.h"
- #include "components/prefs/pref_service.h"
- PrefChangeRegistrar::PrefChangeRegistrar() : service_(nullptr) {}
- PrefChangeRegistrar::~PrefChangeRegistrar() {
- // If you see an invalid memory access in this destructor, this
- // PrefChangeRegistrar might be subscribed to an OffTheRecordProfileImpl that
- // has been destroyed. This should not happen any more but be warned.
- // Feel free to contact battre@chromium.org in case this happens.
- //
- // This can also happen for non-OTR profiles, when the
- // DestroyProfileOnBrowserClose flag is enabled. In that case, contact
- // nicolaso@chromium.org.
- RemoveAll();
- }
- void PrefChangeRegistrar::Init(PrefService* service) {
- DCHECK(IsEmpty() || service_ == service);
- service_ = service;
- }
- void PrefChangeRegistrar::Add(const std::string& path,
- const base::RepeatingClosure& obs) {
- Add(path,
- base::BindRepeating(&PrefChangeRegistrar::InvokeUnnamedCallback, obs));
- }
- void PrefChangeRegistrar::Add(const std::string& path,
- const NamedChangeCallback& obs) {
- if (!service_) {
- NOTREACHED();
- return;
- }
- DCHECK(!IsObserved(path)) << "Already had pref, \"" << path
- << "\", registered.";
- service_->AddPrefObserver(path, this);
- observers_[path] = obs;
- }
- void PrefChangeRegistrar::Remove(const std::string& path) {
- DCHECK(IsObserved(path));
- observers_.erase(path);
- service_->RemovePrefObserver(path, this);
- }
- void PrefChangeRegistrar::RemoveAll() {
- for (ObserverMap::const_iterator it = observers_.begin();
- it != observers_.end(); ++it) {
- service_->RemovePrefObserver(it->first, this);
- }
- observers_.clear();
- }
- bool PrefChangeRegistrar::IsEmpty() const {
- return observers_.empty();
- }
- bool PrefChangeRegistrar::IsObserved(const std::string& pref) {
- return observers_.find(pref) != observers_.end();
- }
- void PrefChangeRegistrar::OnPreferenceChanged(PrefService* service,
- const std::string& pref) {
- if (IsObserved(pref))
- observers_[pref].Run(pref);
- }
- void PrefChangeRegistrar::InvokeUnnamedCallback(
- const base::RepeatingClosure& callback,
- const std::string& pref_name) {
- callback.Run();
- }
- PrefService* PrefChangeRegistrar::prefs() {
- return service_;
- }
- const PrefService* PrefChangeRegistrar::prefs() const {
- return service_;
- }
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