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// Copyright (c) 2011 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_POLICY_MANAGED_PREFS_BANNER_BASE_H_
#define CHROME_BROWSER_POLICY_MANAGED_PREFS_BANNER_BASE_H_
#pragma once
#include "base/basictypes.h"
#include "base/scoped_ptr.h"
#include "chrome/browser/ui/options/options_window.h"
#include "content/common/notification_observer.h"
class PrefService;
class PrefSetObserver;
namespace policy {
// 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:
// Initialize the banner with a set of preferences suitable for the given
// options |page|. Subclasses may change that set by calling AddPref() and
// RemovePref() afterwards.
ManagedPrefsBannerBase(PrefService* local_state,
PrefService* user_prefs,
OptionsPage page);
// Convenience constructor that fetches the local state PrefService from the
// global g_browser_process.
ManagedPrefsBannerBase(PrefService* user_prefs, OptionsPage page);
virtual ~ManagedPrefsBannerBase();
// Determine whether the banner should be visible.
bool DetermineVisibility() const;
// Add a local state preference as visibility trigger.
void AddLocalStatePref(const char* pref);
// Remove a local state preference from being a visibility trigger.
void RemoveLocalStatePref(const char* pref);
// Add a user preference as visibility trigger.
void AddUserPref(const char* pref);
// Remove a user preference from being a visibility trigger.
void RemoveUserPref(const char* pref);
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:
// Initialization helper, called from the constructors.
void Init(PrefService* local_state,
PrefService* user_prefs,
OptionsPage page);
// |NotificationObserver| implementation.
virtual void Observe(NotificationType type,
const NotificationSource& source,
const NotificationDetails& details);
scoped_ptr<PrefSetObserver> local_state_set_;
scoped_ptr<PrefSetObserver> user_pref_set_;
DISALLOW_COPY_AND_ASSIGN(ManagedPrefsBannerBase);
};
} // namespace policy
#endif // CHROME_BROWSER_POLICY_MANAGED_PREFS_BANNER_BASE_H_
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