Implement user selected wallpaper feature.

chrome/browser/ui/webui/options2/chromeos/set_wallpaper_options_handler2.h

 // Copyright (c) 2012 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_OPTIONS2_CHROMEOS_SET_WALLPAPER_OPTIONS_HANDLER2_H_
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS2_CHROMEOS_SET_WALLPAPER_OPTIONS_HANDLER2_H_
 
+#include "ash/desktop_background/desktop_background_resources.h"
 #include "base/memory/weak_ptr.h"
+#include "chrome/browser/ui/select_file_dialog.h"
 #include "chrome/browser/ui/webui/options2/options_ui2.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace base {
 class DictionaryValue;
 class ListValue;
 }
 
 namespace chromeos {
+
+class WallpaperDelegate {
+ public:
+  // Call javascript function to add/update custom wallpaper thumbnail in
+  // picker UI.
+  virtual void SetCustomWallpaperThumbnail() = 0;

[James Hawkins, 2012/05/11 18:13:23]

nit: Add protected destructor.

+};
+
 namespace options2 {
 
 // ChromeOS user image options page UI handler.
-class SetWallpaperOptionsHandler : public ::options2::OptionsPageUIHandler{
+class SetWallpaperOptionsHandler : public ::options2::OptionsPageUIHandler,
+                                   public SelectFileDialog::Listener,
+                                   public WallpaperDelegate {
  public:
   SetWallpaperOptionsHandler();
   virtual ~SetWallpaperOptionsHandler();
 
   // OptionsPageUIHandler implementation.
   virtual void GetLocalizedValues(
       base::DictionaryValue* localized_strings) OVERRIDE;
 
   // WebUIMessageHandler implementation.
   virtual void RegisterMessages() OVERRIDE;
 
+  // WallpaperDelegate implementation.
+  virtual void SetCustomWallpaperThumbnail() OVERRIDE;
+
  private:
+  // SelectFileDialog::Delegate implementation.
+  virtual void FileSelected(const FilePath& path, int index,
+                            void* params) OVERRIDE;
+
   // Sends list of available default images to the page.
   void SendDefaultImages();
 
+  // Sends layout options for custom wallpaper. Only exposes CENTER,
+  // CENTER_CROPPED, STRETCH to users. Set the selected option to specified
+  // |layout|.
+  void SendLayoutOptions(ash::WallpaperLayout layout);
+
   // Handles page initialized event.
   void HandlePageInitialized(const base::ListValue* args);
 
   // Handles page shown event.
   void HandlePageShown(const base::ListValue* args);
 
+  // Opens a file selection dialog to choose user image from file.
+  void HandleChooseFile(const base::ListValue* args);
+
+  // Redraws the wallpaper with specified wallpaper layout.
+  void HandleLayoutChanged(const base::ListValue* args);
+
   // Selects one of the available default wallpapers.
   void HandleDefaultWallpaper(const base::ListValue* args);
 
   // Sets user wallpaper to a random one from the default wallpapers.
   void HandleRandomWallpaper(const base::ListValue* args);
 
   // Returns handle to browser window or NULL if it can't be found.
   gfx::NativeWindow GetBrowserWindow() const;
 
+  // Shows a dialog box for selecting a file.
+  scoped_refptr<SelectFileDialog> select_file_dialog_;
+
   base::WeakPtrFactory<SetWallpaperOptionsHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SetWallpaperOptionsHandler);
 };
 
 }  // namespace options2
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS2_CHROMEOS_SET_WALLPAPER_OPTIONS_HANDLER2_H_