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.h b/chrome/browser/managed_prefs_banner_base.h
new file mode 100644
index 0000000..f0013ca
--- /dev/null
+++ b/chrome/browser/managed_prefs_banner_base.h
@@ -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.
+
+#ifndef CHROME_BROWSER_MANAGED_PREFS_BANNER_BASE_H_
+#define CHROME_BROWSER_MANAGED_PREFS_BANNER_BASE_H_
+
+#include <set>
+#include <string>
+
+#include "base/basictypes.h"
+#include "chrome/common/notification_observer.h"
+
+class PrefService;
+
+// Common base functionality for the managed prefs warning banner displayed in
+// the preference dialogs when there are options that are controlled by
+// configuration policy and thus cannot be changed by the user.
+class ManagedPrefsBannerBase : public NotificationObserver {
+ public:
+  ManagedPrefsBannerBase(PrefService* prefs,
+                         const wchar_t** relevant_prefs,
+                         size_t count);
+  virtual ~ManagedPrefsBannerBase();
+
+  // Determine whether the banner should be visible.
+  bool DetermineVisibility() const;
+
+  // |NotificationObserver| implementation.
+  virtual void Observe(NotificationType type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details);
+
+ protected:
+  // Update banner visibility. This is called whenever a preference change is
+  // observed that may lead to changed visibility of the banner. Subclasses may
+  // override this in order to show/hide the banner.
+  virtual void OnUpdateVisibility() { }
+
+ private:
+  PrefService* prefs_;
+  typedef std::set<std::wstring> PrefSet;
+  const PrefSet relevant_prefs_;
+
+  DISALLOW_COPY_AND_ASSIGN(ManagedPrefsBannerBase);
+};
+#endif  // CHROME_BROWSER_MANAGED_PREFS_BANNER_BASE_H_