Managed preferences warning banner for the Linux preferences dialog.

BUG=43423
TEST=Unit test in managed_prefs_banner_base_unittest.cc, manual UI tests

Review URL: http://codereview.chromium.org/2425006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@49151 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 47 insertions, 0 deletions

diff --git a/chrome/browser/managed_prefs_banner_base.cc b/chrome/browser/managed_prefs_banner_base.cc
new file mode 100644
index 0000000..5251d7f
--- /dev/null
+++ b/chrome/browser/managed_prefs_banner_base.cc
@@ -0,0 +1,47 @@
+// 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/managed_prefs_banner_base.h"
+
+#include "chrome/browser/pref_service.h"
+#include "chrome/common/notification_details.h"
+#include "chrome/common/notification_source.h"
+#include "chrome/common/notification_type.h"
+
+ManagedPrefsBannerBase::ManagedPrefsBannerBase(PrefService* prefs,
+                                               const wchar_t** relevant_prefs,
+                                               size_t count)
+    : prefs_(prefs),
+      relevant_prefs_(relevant_prefs, relevant_prefs + count) {
+  for (PrefSet::const_iterator pref(relevant_prefs_.begin());
+       pref != relevant_prefs_.end(); ++pref)
+    prefs_->AddPrefObserver(pref->c_str(), this);
+}
+
+ManagedPrefsBannerBase::~ManagedPrefsBannerBase() {
+  for (PrefSet::const_iterator pref(relevant_prefs_.begin());
+       pref != relevant_prefs_.end(); ++pref)
+    prefs_->RemovePrefObserver(pref->c_str(), this);
+}
+
+void ManagedPrefsBannerBase::Observe(NotificationType type,
+                                     const NotificationSource& source,
+                                     const NotificationDetails& details) {
+  if (NotificationType::PREF_CHANGED == type) {
+    std::wstring* pref = Details<std::wstring>(details).ptr();
+    if (pref && relevant_prefs_.count(*pref))
+      OnUpdateVisibility();
+  }
+}
+
+bool ManagedPrefsBannerBase::DetermineVisibility() const {
+  for (PrefSet::const_iterator pref_name(relevant_prefs_.begin());
+       pref_name != relevant_prefs_.end(); ++pref_name) {
+    const PrefService::Preference* pref =
+        prefs_->FindPreference(pref_name->c_str());
+    if (pref && pref->IsManaged())
+      return true;
+  }
+  return false;
+}