1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef CHROME_BROWSER_POLICY_MANAGED_PREFS_BANNER_BASE_H_ 6 #define CHROME_BROWSER_POLICY_MANAGED_PREFS_BANNER_BASE_H_ 7 #pragma once 8 9 #include "base/basictypes.h" 10 #include "base/memory/scoped_ptr.h" 11 #include "chrome/browser/ui/options/options_window.h" 12 #include "content/common/notification_observer.h" 13 14 class PrefService; 15 class PrefSetObserver; 16 17 namespace policy { 18 19 // Common base functionality for the managed prefs warning banner displayed in 20 // the preference dialogs when there are options that are controlled by 21 // configuration policy and thus cannot be changed by the user. 22 class ManagedPrefsBannerBase : public NotificationObserver { 23 public: 24 // Initialize the banner with a set of preferences suitable for the given 25 // options |page|. Subclasses may change that set by calling AddPref() and 26 // RemovePref() afterwards. 27 ManagedPrefsBannerBase(PrefService* local_state, 28 PrefService* user_prefs, 29 OptionsPage page); 30 31 // Convenience constructor that fetches the local state PrefService from the 32 // global g_browser_process. 33 ManagedPrefsBannerBase(PrefService* user_prefs, OptionsPage page); 34 35 virtual ~ManagedPrefsBannerBase(); 36 37 // Determine whether the banner should be visible. 38 bool DetermineVisibility() const; 39 40 // Add a local state preference as visibility trigger. 41 void AddLocalStatePref(const char* pref); 42 // Remove a local state preference from being a visibility trigger. 43 void RemoveLocalStatePref(const char* pref); 44 45 // Add a user preference as visibility trigger. 46 void AddUserPref(const char* pref); 47 // Remove a user preference from being a visibility trigger. 48 void RemoveUserPref(const char* pref); 49 50 protected: 51 // Update banner visibility. This is called whenever a preference change is 52 // observed that may lead to changed visibility of the banner. Subclasses may 53 // override this in order to show/hide the banner. OnUpdateVisibility()54 virtual void OnUpdateVisibility() { } 55 56 private: 57 // Initialization helper, called from the constructors. 58 void Init(PrefService* local_state, 59 PrefService* user_prefs, 60 OptionsPage page); 61 62 // |NotificationObserver| implementation. 63 virtual void Observe(NotificationType type, 64 const NotificationSource& source, 65 const NotificationDetails& details); 66 67 scoped_ptr<PrefSetObserver> local_state_set_; 68 scoped_ptr<PrefSetObserver> user_pref_set_; 69 70 DISALLOW_COPY_AND_ASSIGN(ManagedPrefsBannerBase); 71 }; 72 73 } // namespace policy 74 75 #endif // CHROME_BROWSER_POLICY_MANAGED_PREFS_BANNER_BASE_H_ 76