// 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_SHELL_DELEGATE_H_
#define ASH_SHELL_DELEGATE_H_

#include <string>

#include "ash/ash_export.h"
#include "ash/shell.h"
#include "base/callback.h"
#include "base/strings/string16.h"

namespace app_list {
class AppListViewDelegate;
}

namespace aura {
class Window;
}

namespace gfx {
class Image;
}

namespace ui {
class MenuModel;
}

namespace keyboard {
class KeyboardUI;
}

namespace ash {

class AccessibilityDelegate;
class MediaDelegate;
class NewWindowDelegate;
class SessionStateDelegate;
class ShelfDelegate;
class ShelfModel;
class SystemTrayDelegate;
class UserWallpaperDelegate;
class Shelf;
struct ShelfItem;

class ASH_EXPORT VirtualKeyboardStateObserver {
 public:
  // Called when keyboard is activated/deactivated.
  virtual void OnVirtualKeyboardStateChanged(bool activated) {}

 protected:
  virtual ~VirtualKeyboardStateObserver() {}
};

// Delegate of the Shell.
class ASH_EXPORT ShellDelegate {
 public:
  // The Shell owns the delegate.
  virtual ~ShellDelegate() {}

  // Returns true if this is the first time that the shell has been run after
  // the system has booted.  false is returned after the shell has been
  // restarted, typically due to logging in as a guest or logging out.
  virtual bool IsFirstRunAfterBoot() const = 0;

  // Returns true if multi-profiles feature is enabled.
  virtual bool IsMultiProfilesEnabled() const = 0;

  // Returns true if incognito mode is allowed for the user.
  // Incognito windows are restricted for supervised users.
  virtual bool IsIncognitoAllowed() const = 0;

  // Returns true if we're running in forced app mode.
  virtual bool IsRunningInForcedAppMode() const = 0;

  // Returns true if |window| can be shown for the delegate's concept of current
  // user.
  virtual bool CanShowWindowForUser(aura::Window* window) const = 0;

  // Returns true if the first window shown on first run should be
  // unconditionally maximized, overriding the heuristic that normally chooses
  // the window size.
  virtual bool IsForceMaximizeOnFirstRun() const = 0;

  // Called before processing |Shell::Init()| so that the delegate
  // can perform tasks necessary before the shell is initialized.
  virtual void PreInit() = 0;

  // Called at the beginninig of Shell destructor so that
  // delegate can use Shell instance to perform cleanup tasks.
  virtual void PreShutdown() = 0;

  // Invoked when the user uses Ctrl-Shift-Q to close chrome.
  virtual void Exit() = 0;

  // Create a shell-specific keyboard::KeyboardUI
  virtual keyboard::KeyboardUI* CreateKeyboardUI() = 0;

  // Called when virtual keyboard has been activated/deactivated.
  virtual void VirtualKeyboardActivated(bool activated) = 0;

  // Adds or removes virtual keyboard state observer.
  virtual void AddVirtualKeyboardStateObserver(
      VirtualKeyboardStateObserver* observer) = 0;
  virtual void RemoveVirtualKeyboardStateObserver(
      VirtualKeyboardStateObserver* observer) = 0;

  // Get the AppListViewDelegate, creating one if it does not yet exist.
  // Ownership stays with Chrome's AppListService, or the ShellDelegate.
  virtual app_list::AppListViewDelegate* GetAppListViewDelegate() = 0;

  // Creates a new ShelfDelegate. Shell takes ownership of the returned
  // value.
  virtual ShelfDelegate* CreateShelfDelegate(ShelfModel* model) = 0;

  // Creates a system-tray delegate. Shell takes ownership of the delegate.
  virtual SystemTrayDelegate* CreateSystemTrayDelegate() = 0;

  // Creates a user wallpaper delegate. Shell takes ownership of the delegate.
  virtual UserWallpaperDelegate* CreateUserWallpaperDelegate() = 0;

  // Creates a session state delegate. Shell takes ownership of the delegate.
  virtual SessionStateDelegate* CreateSessionStateDelegate() = 0;

  // Creates a accessibility delegate. Shell takes ownership of the delegate.
  virtual AccessibilityDelegate* CreateAccessibilityDelegate() = 0;

  // Creates an application delegate. Shell takes ownership of the delegate.
  virtual NewWindowDelegate* CreateNewWindowDelegate() = 0;

  // Creates a media delegate. Shell takes ownership of the delegate.
  virtual MediaDelegate* CreateMediaDelegate() = 0;

  // Creates a menu model for the |shelf| and optional shelf |item|.
  // If |item| is null, this creates a context menu for the desktop or shelf.
  virtual ui::MenuModel* CreateContextMenu(ash::Shelf* shelf,
                                           const ash::ShelfItem* item) = 0;

  // Creates a GPU support object. Shell takes ownership of the object.
  virtual GPUSupport* CreateGPUSupport() = 0;

  // Get the product name.
  virtual base::string16 GetProductName() const = 0;

  virtual void OpenKeyboardShortcutHelpPage() const {}

  virtual gfx::Image GetDeprecatedAcceleratorImage() const = 0;

  // Toggles the status of the touchpad / touchscreen on or off.
  virtual void ToggleTouchpad() {}
  virtual void ToggleTouchscreen() {}
};

}  // namespace ash

#endif  // ASH_SHELL_DELEGATE_H_