chrome/browser/ui/webui/options/options_ui.h

   1 // Copyright (c) 2012 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_UI_WEBUI_OPTIONS_OPTIONS_UI_H_
   6 #define CHROME_BROWSER_UI_WEBUI_OPTIONS_OPTIONS_UI_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "base/compiler_specific.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "content/public/browser/notification_registrar.h"
  14 #include "content/public/browser/web_contents_observer.h"
  15 #include "content/public/browser/web_ui_controller.h"
  16 #include "content/public/browser/web_ui_message_handler.h"
  17 #include "ui/base/layout.h"
  18
  19 class AutocompleteResult;
  20
  21 namespace base {
  22 class DictionaryValue;
  23 class ListValue;
  24 class RefCountedMemory;
  25 }
  26
  27 #if defined(OS_CHROMEOS)
  28 namespace chromeos {
  29 namespace system {
  30 class PointerDeviceObserver;
  31 }  // namespace system
  32 }  // namespace chromeos
  33 #endif
  34
  35 namespace options {
  36
  37 // The base class handler of Javascript messages of options pages.
  38 class OptionsPageUIHandler : public content::WebUIMessageHandler {
  39  public:
  40   // Key for identifying the Settings App localized_strings in loadTimeData.
  41   static const char kSettingsAppKey[];
  42
  43   OptionsPageUIHandler();
  44   virtual ~OptionsPageUIHandler();
  45
  46   // Is this handler enabled?
  47   virtual bool IsEnabled();
  48
  49   // Collects localized strings for options page.
  50   virtual void GetLocalizedValues(base::DictionaryValue* localized_strings) = 0;
  51
  52   virtual void PageLoadStarted() {}
  53
  54   // Will be called only once in the life time of the handler. Generally used to
  55   // add observers, initializes preferences, or start asynchronous calls from
  56   // various services.
  57   virtual void InitializeHandler() {}
  58
  59   // Initialize the page. Called once the DOM is available for manipulation.
  60   // This will be called when a RenderView is re-used (when navigated to with
  61   // back/forward or session restored in some cases) or when created.
  62   virtual void InitializePage() {}
  63
  64   // Uninitializes the page.  Called just before the object is destructed.
  65   virtual void Uninitialize() {}
  66
  67   // WebUIMessageHandler implementation.
  68   virtual void RegisterMessages() OVERRIDE {}
  69
  70  protected:
  71   struct OptionsStringResource {
  72     // The name of the resource in templateData.
  73     const char* name;
  74     // The .grd ID for the resource (IDS_*).
  75     int id;
  76     // The .grd ID of the string to replace $1 in |id|'s string. If zero or
  77     // omitted (default initialized), no substitution is attempted.
  78     int substitution_id;
  79   };
  80
  81   // A helper to simplify string registration in WebUI for strings which do not
  82   // change at runtime and optionally contain a single substitution.
  83   static void RegisterStrings(base::DictionaryValue* localized_strings,
  84                               const OptionsStringResource* resources,
  85                               size_t length);
  86
  87   // Registers string resources for a page's header and tab title.
  88   static void RegisterTitle(base::DictionaryValue* localized_strings,
  89                             const std::string& variable_name,
  90                             int title_id);
  91
  92   content::NotificationRegistrar registrar_;
  93
  94  private:
  95   DISALLOW_COPY_AND_ASSIGN(OptionsPageUIHandler);
  96 };
  97
  98 // An interface for common operations that a host of OptionsPageUIHandlers
  99 // should provide.
 100 class OptionsPageUIHandlerHost {
 101  public:
 102   virtual void InitializeHandlers() = 0;
 103
 104  protected:
 105   virtual ~OptionsPageUIHandlerHost() {}
 106 };
 107
 108 // The WebUI for chrome:settings-frame.
 109 class OptionsUI : public content::WebUIController,
 110                   public content::WebContentsObserver,
 111                   public OptionsPageUIHandlerHost {
 112  public:
 113   explicit OptionsUI(content::WebUI* web_ui);
 114   virtual ~OptionsUI();
 115
 116   // Takes the suggestions from |result| and adds them to |suggestions| so that
 117   // they can be passed to a JavaScript function.
 118   static void ProcessAutocompleteSuggestions(
 119       const AutocompleteResult& result,
 120       base::ListValue* const suggestions);
 121
 122   static base::RefCountedMemory* GetFaviconResourceBytes(
 123       ui::ScaleFactor scale_factor);
 124
 125   // Overridden from content::WebContentsObserver:
 126   virtual void DidStartProvisionalLoadForFrame(
 127       int64 frame_id,
 128       int64 parent_frame_id,
 129       bool is_main_frame,
 130       const GURL& validated_url,
 131       bool is_error_page,
 132       bool is_iframe_srcdoc,
 133       content::RenderViewHost* render_view_host) OVERRIDE;
 134
 135   // Overridden from OptionsPageUIHandlerHost:
 136   virtual void InitializeHandlers() OVERRIDE;
 137
 138  private:
 139   // Adds OptionsPageUiHandler to the handlers list if handler is enabled.
 140   void AddOptionsPageUIHandler(base::DictionaryValue* localized_strings,
 141                                OptionsPageUIHandler* handler);
 142
 143   bool initialized_handlers_;
 144
 145   std::vector<OptionsPageUIHandler*> handlers_;
 146
 147 #if defined(OS_CHROMEOS)
 148   scoped_ptr<chromeos::system::PointerDeviceObserver>
 149       pointer_device_observer_;
 150 #endif
 151
 152   DISALLOW_COPY_AND_ASSIGN(OptionsUI);
 153 };
 154
 155 }  // namespace options
 156
 157 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_OPTIONS_UI_H_