chrome/browser/ui/webui/chromeos/login/base_screen_handler.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_CHROMEOS_LOGIN_BASE_SCREEN_HANDLER_H_
   6 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_BASE_SCREEN_HANDLER_H_
   7
   8 #include <string>
   9
  10 #include "base/bind.h"
  11 #include "base/bind_helpers.h"
  12 #include "base/callback.h"
  13 #include "base/strings/string16.h"
  14 #include "chrome/browser/ui/webui/chromeos/login/base_screen_handler_utils.h"
  15 #include "content/public/browser/web_ui.h"
  16 #include "content/public/browser/web_ui_message_handler.h"
  17 #include "ui/gfx/native_widget_types.h"
  18
  19 namespace base {
  20 class DictionaryValue;
  21 class ListValue;
  22 class Value;
  23 }
  24
  25 namespace chromeos {
  26
  27 // Class that collects Localized Values for translation.
  28 class LocalizedValuesBuilder {
  29  public:
  30   explicit LocalizedValuesBuilder(base::DictionaryValue* dict);
  31   // Method to declare localized value. |key| is the i18n key used in html.
  32   // |message| is text of the message.
  33   void Add(const std::string& key, const std::string& message);
  34
  35   // Method to declare localized value. |key| is the i18n key used in html.
  36   // |message| is text of the message.
  37   void Add(const std::string& key, const base::string16& message);
  38
  39   // Method to declare localized value. |key| is the i18n key used in html.
  40   // |message_id| is a resource id of message.
  41   void Add(const std::string& key, int message_id);
  42
  43   // Method to declare localized value. |key| is the i18n key used in html.
  44   // |message_id| is a resource id of message. Message is expected to have
  45   // one format parameter subsituted by |a|.
  46   void AddF(const std::string& key,
  47             int message_id,
  48             const base::string16& a);
  49
  50   // Method to declare localized value. |key| is the i18n key used in html.
  51   // |message_id| is a resource id of message. Message is expected to have
  52   // two format parameters subsituted by |a| and |b| respectively.
  53   void AddF(const std::string& key,
  54             int message_id,
  55             const base::string16& a,
  56             const base::string16& b);
  57
  58   // Method to declare localized value. |key| is the i18n key used in html.
  59   // |message_id| is a resource id of message. Message is expected to have
  60   // one format parameter subsituted by resource identified by |message_id_a|.
  61   void AddF(const std::string& key,
  62             int message_id,
  63             int message_id_a);
  64
  65   // Method to declare localized value. |key| is the i18n key used in html.
  66   // |message_id| is a resource id of message. Message is expected to have
  67   // two format parameters subsituted by resource identified by |message_id_a|
  68   // and |message_id_b| respectively.
  69   void AddF(const std::string& key,
  70             int message_id,
  71             int message_id_a,
  72             int message_id_b);
  73  private:
  74   // Not owned.
  75   base::DictionaryValue* dict_;
  76 };
  77
  78 // Base class for the OOBE/Login WebUI handlers.
  79 class BaseScreenHandler : public content::WebUIMessageHandler {
  80  public:
  81   // C-tor used when JS screen prefix is not needed.
  82   BaseScreenHandler();
  83
  84   // C-tor used when JS screen prefix is needed.
  85   explicit BaseScreenHandler(const std::string& js_screen_path);
  86
  87   virtual ~BaseScreenHandler();
  88
  89   // Gets localized strings to be used on the page.
  90   void GetLocalizedStrings(
  91       base::DictionaryValue* localized_strings);
  92
  93   // This method is called when page is ready. It propagates to inherited class
  94   // via virtual Initialize() method (see below).
  95   void InitializeBase();
  96
  97   void set_async_assets_load_id(const std::string& async_assets_load_id) {
  98     async_assets_load_id_ = async_assets_load_id;
  99   }
 100   const std::string& async_assets_load_id() const {
 101     return async_assets_load_id_;
 102   }
 103
 104  protected:
 105   // All subclasses should implement this method to provide localized values.
 106   virtual void DeclareLocalizedValues(LocalizedValuesBuilder* builder) = 0;
 107
 108   // Subclasses can override these methods to pass additional parameters
 109   // to loadTimeData. Generally, it is a bad approach, and it should be replaced
 110   // with Context at some point.
 111   virtual void GetAdditionalParameters(base::DictionaryValue* parameters);
 112
 113   // Shortcut for calling JS methods on WebUI side.
 114   void CallJS(const std::string& method);
 115
 116   template<typename A1>
 117   void CallJS(const std::string& method, const A1& arg1) {
 118     web_ui()->CallJavascriptFunction(FullMethodPath(method), MakeValue(arg1));
 119   }
 120
 121   template<typename A1, typename A2>
 122   void CallJS(const std::string& method, const A1& arg1, const A2& arg2) {
 123     web_ui()->CallJavascriptFunction(FullMethodPath(method), MakeValue(arg1),
 124                                      MakeValue(arg2));
 125   }
 126
 127   template<typename A1, typename A2, typename A3>
 128   void CallJS(const std::string& method,
 129               const A1& arg1,
 130               const A2& arg2,
 131               const A3& arg3) {
 132     web_ui()->CallJavascriptFunction(FullMethodPath(method),
 133                                      MakeValue(arg1),
 134                                      MakeValue(arg2),
 135                                      MakeValue(arg3));
 136   }
 137
 138   template<typename A1, typename A2, typename A3, typename A4>
 139   void CallJS(const std::string& method,
 140               const A1& arg1,
 141               const A2& arg2,
 142               const A3& arg3,
 143               const A4& arg4) {
 144     web_ui()->CallJavascriptFunction(FullMethodPath(method),
 145                                      MakeValue(arg1),
 146                                      MakeValue(arg2),
 147                                      MakeValue(arg3),
 148                                      MakeValue(arg4));
 149   }
 150
 151   // Shortcut methods for adding WebUI callbacks.
 152   template<typename T>
 153   void AddRawCallback(const std::string& name,
 154                       void (T::*method)(const base::ListValue* args)) {
 155     web_ui()->RegisterMessageCallback(
 156         name,
 157         base::Bind(method, base::Unretained(static_cast<T*>(this))));
 158   }
 159
 160   template<typename T>
 161   void AddCallback(const std::string& name, void (T::*method)()) {
 162     base::Callback<void()> callback =
 163         base::Bind(method, base::Unretained(static_cast<T*>(this)));
 164     web_ui()->RegisterMessageCallback(
 165         name, base::Bind(&CallbackWrapper0, callback));
 166   }
 167
 168   template<typename T, typename A1>
 169   void AddCallback(const std::string& name, void (T::*method)(A1 arg1)) {
 170     base::Callback<void(A1)> callback =
 171         base::Bind(method, base::Unretained(static_cast<T*>(this)));
 172     web_ui()->RegisterMessageCallback(
 173         name, base::Bind(&CallbackWrapper1<A1>, callback));
 174   }
 175
 176   template<typename T, typename A1, typename A2>
 177   void AddCallback(const std::string& name,
 178                    void (T::*method)(A1 arg1, A2 arg2)) {
 179     base::Callback<void(A1, A2)> callback =
 180         base::Bind(method, base::Unretained(static_cast<T*>(this)));
 181     web_ui()->RegisterMessageCallback(
 182         name, base::Bind(&CallbackWrapper2<A1, A2>, callback));
 183   }
 184
 185   template<typename T, typename A1, typename A2, typename A3>
 186   void AddCallback(const std::string& name,
 187                    void (T::*method)(A1 arg1, A2 arg2, A3 arg3)) {
 188     base::Callback<void(A1, A2, A3)> callback =
 189         base::Bind(method, base::Unretained(static_cast<T*>(this)));
 190     web_ui()->RegisterMessageCallback(
 191         name, base::Bind(&CallbackWrapper3<A1, A2, A3>, callback));
 192   }
 193
 194   template<typename T, typename A1, typename A2, typename A3, typename A4>
 195   void AddCallback(const std::string& name,
 196                    void (T::*method)(A1 arg1, A2 arg2, A3 arg3, A4 arg4)) {
 197     base::Callback<void(A1, A2, A3, A4)> callback =
 198         base::Bind(method, base::Unretained(static_cast<T*>(this)));
 199     web_ui()->RegisterMessageCallback(
 200         name, base::Bind(&CallbackWrapper4<A1, A2, A3, A4>, callback));
 201   }
 202
 203   // Called when the page is ready and handler can do initialization.
 204   virtual void Initialize() = 0;
 205
 206   // Show selected WebUI |screen|. Optionally it can pass screen initialization
 207   // data via |data| parameter.
 208   void ShowScreen(const char* screen, const base::DictionaryValue* data);
 209
 210   // Whether page is ready.
 211   bool page_is_ready() const { return page_is_ready_; }
 212
 213   // Returns the window which shows us.
 214   virtual gfx::NativeWindow GetNativeWindow();
 215
 216  private:
 217   // Returns full name of JS method based on screen and method
 218   // names.
 219   std::string FullMethodPath(const std::string& method) const;
 220
 221   // Keeps whether page is ready.
 222   bool page_is_ready_;
 223
 224   base::DictionaryValue* localized_values_;
 225
 226   // Full name of the corresponding JS screen object. Can be empty, if
 227   // there are no corresponding screen object or several different
 228   // objects.
 229   std::string js_screen_path_prefix_;
 230
 231   // The string id used in the async asset load in JS. If it is set to a
 232   // non empty value, the Initialize will be deferred until the underlying load
 233   // is finished.
 234   std::string async_assets_load_id_;
 235
 236   DISALLOW_COPY_AND_ASSIGN(BaseScreenHandler);
 237 };
 238
 239 }  // namespace chromeos
 240
 241 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_BASE_SCREEN_HANDLER_H_