[ChromeOS] WebUI OOBE/Login refactoring.

chrome/browser/ui/webui/chromeos/login/base_screen_handler.h

+// 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_UI_WEBUI_CHROMEOS_LOGIN_BASE_SCREEN_HANDLER_H_
+#define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_BASE_SCREEN_HANDLER_H_
+#pragma once
+
+#include "content/browser/webui/web_ui.h"
+
+namespace chromeos {
+
+// Base class for the OOBE/Login WebUI handlers.
+class BaseScreenHandler : public WebUIMessageHandler {
+ public:
+  BaseScreenHandler();
+  virtual ~BaseScreenHandler();
+
+  // Gets localized strings to be used on the page.
+  virtual void GetLocalizedStrings(
+      base::DictionaryValue* localized_strings) = 0;
+
+  // This method is called when page is ready. It propagates to inherited class
+  // via virtual Initialize() method (see below).
+  void InitializeBase();
+
+ protected:
+  // Called when the page is ready and handler can do initialization.
+  virtual void Initialize() = 0;
+
+  // Show selected WebUI |screen|. Optionally it can pass screen initialization
+  // data via |data| parameter.
+  void ShowScreen(const char* screen, const char* data);
+
+  // Whether page is ready.
+  bool page_is_ready() const { return page_is_ready_; }
+
+ private:
+  // Keeps whether page is ready.
+  bool page_is_ready_;
+
+  DISALLOW_COPY_AND_ASSIGN(BaseScreenHandler);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_BASE_SCREEN_HANDLER_H_