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// Copyright 2017 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/font_pref_change_notifier.h"
#include "base/check.h"
#include "base/functional/bind.h"
#include "base/observer_list.h"
#include "base/strings/string_util.h"
#include "chrome/common/pref_names_util.h"
#include "components/prefs/pref_service.h"
FontPrefChangeNotifier::Registrar::Registrar() = default;
FontPrefChangeNotifier::Registrar::~Registrar() {
if (is_registered())
Unregister();
}
void FontPrefChangeNotifier::Registrar::Register(
FontPrefChangeNotifier* notifier,
FontPrefChangeNotifier::Callback cb) {
DCHECK(!is_registered());
notifier_ = notifier;
callback_ = std::move(cb);
notifier_->AddRegistrar(this);
}
void FontPrefChangeNotifier::Registrar::Unregister() {
DCHECK(is_registered());
notifier_->RemoveRegistrar(this);
notifier_ = nullptr;
callback_ = FontPrefChangeNotifier::Callback();
}
FontPrefChangeNotifier::FontPrefChangeNotifier(PrefService* pref_service)
: pref_service_(pref_service) {
pref_service_->AddPrefObserverAllPrefs(this);
}
FontPrefChangeNotifier::~FontPrefChangeNotifier() {
pref_service_->RemovePrefObserverAllPrefs(this);
// There could be a shutdown race between this class and the objects
// registered with it. We don't want the registrars to call back into us
// when we're deleted, so tell them to unregister now.
for (auto& reg : registrars_)
reg.Unregister();
}
void FontPrefChangeNotifier::AddRegistrar(Registrar* registrar) {
registrars_.AddObserver(registrar);
}
void FontPrefChangeNotifier::RemoveRegistrar(Registrar* registrar) {
registrars_.RemoveObserver(registrar);
}
void FontPrefChangeNotifier::OnPreferenceChanged(PrefService* pref_service,
std::string_view pref_name) {
if (base::StartsWith(pref_name, pref_names_util::kWebKitFontPrefPrefix,
base::CompareCase::SENSITIVE)) {
const std::string pref_name_string(pref_name);
for (auto& reg : registrars_)
reg.callback_.Run(pref_name_string);
}
}
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