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