// 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 ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_CONTROLLER_H_
#define ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_CONTROLLER_H_
#pragma once

#include "ash/ash_export.h"
#include "ash/desktop_background/desktop_background_resources.h"
#include "base/basictypes.h"

class SkBitmap;

namespace ash {

class UserWallpaperDelegate {
 public:
  virtual ~UserWallpaperDelegate() {}

  // Gets the index of user selected wallpaper.
  virtual const int GetUserWallpaperIndex() = 0;

  // Open the set wallpaper page in the browser.
  virtual void OpenSetWallpaperPage() = 0;

  // Returns true if user can open set wallpaper page. Only guest user returns
  // false currently.
  virtual bool CanOpenSetWallpaperPage() = 0;
};

// A class to listen for login and desktop background change events and set the
// corresponding default wallpaper in Aura shell.
class ASH_EXPORT DesktopBackgroundController {
 public:
  enum BackgroundMode {
    BACKGROUND_IMAGE,
    BACKGROUND_SOLID_COLOR
  };

  DesktopBackgroundController();
  virtual ~DesktopBackgroundController();

  // Get the desktop background mode.
  BackgroundMode desktop_background_mode() const {
    return desktop_background_mode_;
  }

  // Sets the desktop background to image mode and create a new background
  // widget with user selected wallpaper or default wallpaper. Delete the old
  // widget if any.
  void SetDesktopBackgroundImageMode();

  // Sets the desktop background to solid color mode and create a solid color
  // layout.
  void SetDesktopBackgroundSolidColorMode();

 private:
  // Can change at runtime.
  BackgroundMode desktop_background_mode_;

  DISALLOW_COPY_AND_ASSIGN(DesktopBackgroundController);
};

}  // namespace ash

#endif  // ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_CONTROLLER_H_