Disable proxy config button and show banner if proxy prefs are managed.

chrome/browser/pref_set_observer.cc

+// 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 "chrome/browser/pref_set_observer.h"
+
+#include "chrome/common/notification_type.h"
+#include "chrome/common/pref_names.h"
+
+PrefSetObserver::PrefSetObserver(PrefService* pref_service,
+                                 NotificationObserver* observer)
+    : pref_service_(pref_service),
+      observer_(observer) {
+}
+
+PrefSetObserver::~PrefSetObserver() {
+  for (PrefSet::const_iterator i(prefs_.begin()); i != prefs_.end(); ++i)
+    pref_service_->RemovePrefObserver(i->c_str(), this);
+}
+
+void PrefSetObserver::AddPref(const std::wstring& pref) {
+  if (!prefs_.count(pref) && pref_service_->FindPreference(pref.c_str())) {
+    prefs_.insert(pref);
+    pref_service_->AddPrefObserver(pref.c_str(), this);
+  }
+}
+
+void PrefSetObserver::RemovePref(const std::wstring& pref) {
+  if (prefs_.erase(pref))
+    pref_service_->RemovePrefObserver(pref.c_str(), this);
+}
+
+bool PrefSetObserver::IsObserved(const std::wstring& pref) {
+  return prefs_.count(pref) > 0;
+}
+
+bool PrefSetObserver::IsManaged() {
+  for (PrefSet::const_iterator i(prefs_.begin()); i != prefs_.end(); ++i) {
+    const PrefService::Preference* pref =
+        pref_service_->FindPreference(i->c_str());
+    if (pref && pref->IsManaged())
+      return true;
+  }
+  return false;
+}
+
+// static
+PrefSetObserver* PrefSetObserver::CreateProxyPrefSetObserver(
+    PrefService* pref_service,
+    NotificationObserver* observer) {
+  PrefSetObserver* pref_set = new PrefSetObserver(pref_service, observer);
+  pref_set->AddPref(prefs::kNoProxyServer);
+  pref_set->AddPref(prefs::kProxyAutoDetect);
+  pref_set->AddPref(prefs::kProxyServer);
+  pref_set->AddPref(prefs::kProxyPacUrl);
+  pref_set->AddPref(prefs::kProxyBypassList);
+
+  return pref_set;
+}
+
+void PrefSetObserver::Observe(NotificationType type,
+                              const NotificationSource& source,
+                              const NotificationDetails& details) {
+  if (observer_)
+    observer_->Observe(type, source, details);
+}