ash/login/ui/login_big_user_view.h

// Copyright 2018 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_LOGIN_UI_LOGIN_BIG_USER_VIEW_H_
#define ASH_LOGIN_UI_LOGIN_BIG_USER_VIEW_H_

#include "ash/ash_export.h"
#include "ash/login/ui/login_auth_user_view.h"
#include "ash/login/ui/login_public_account_user_view.h"
#include "ash/login/ui/login_user_view.h"
#include "ash/login/ui/non_accessible_view.h"
#include "ash/login/ui/parent_access_view.h"
#include "ash/public/interfaces/user_info.mojom.h"
#include "ash/wallpaper/wallpaper_controller_observer.h"

namespace ash {

class WallpaperController;

// Displays the big user view in the login screen. This is a container view
// which has one of the following views as its only child:
//  - LoginAuthUserView: for regular user.
//  - LoginPublicAccountUserView: for public account user.
//  - ParentAccessView: for child user when parent access was requested
//    (it is swapped with LoginAuthUserView).
// ParentAccessView cannot be used as a standalone view, it is only used
// together with LoginAuthUserView. ParentAccessView cannot be used with
// LoginPublicAccountUserView.
class ASH_EXPORT LoginBigUserView : public NonAccessibleView,
                                    public WallpaperControllerObserver {
 public:
  LoginBigUserView(
      const mojom::LoginUserInfoPtr& user,
      const LoginAuthUserView::Callbacks& auth_user_callbacks,
      const LoginPublicAccountUserView::Callbacks& public_account_callbacks,
      const ParentAccessView::Callbacks& parent_access_callbacks);
  ~LoginBigUserView() override;

  // Base on the user type, call CreateAuthUser or CreatePublicAccount.
  void CreateChildView(const mojom::LoginUserInfoPtr& user);

  // Update the displayed name, icon, etc to that of |user|.
  // It is safe to call it when ParentAccessView is shown.
  // LoginPublicAccountUserView, even if not visible, will be updated and the
  // result will be displayed after ParentAccessView is dismissed.
  void UpdateForUser(const mojom::LoginUserInfoPtr& user);

  // Replaces LoginAuthUserView with ParentAccessView. Does not destroy
  // LoginAuthUserView. Should not be called for LoginBigUserView that contains
  // LoginPublicAccountUserView.
  void ShowParentAccessView();

  // Replaces ParentAccessView with previously stored LoginAuthUserView.
  // Destroys ParentAccessView. Should not be called for LoginBigUserView that
  // contains LoginPublicAccountUserView. Should only be called if
  // ShowParentAccessView() was called before.
  void HideParentAccessView();

  // Safe to call in any state.
  const mojom::LoginUserInfoPtr& GetCurrentUser() const;

  // Safe to call in any state.
  LoginUserView* GetUserView();

  // Safe to call in any state.
  bool IsAuthEnabled() const;

  LoginPublicAccountUserView* public_account() { return public_account_; }
  LoginAuthUserView* auth_user() { return auth_user_; }
  ParentAccessView* parent_access() { return parent_access_; }

  // views::View:
  void RequestFocus() override;
  void ChildPreferredSizeChanged(views::View* child) override;

  // WallpaperControllerObserver:
  void OnWallpaperBlurChanged() override;

 private:
  // Create LoginAuthUserView and add it as child view.
  // |public_account_| will be deleted if exists to ensure the single child.
  void CreateAuthUser(const mojom::LoginUserInfoPtr& user);

  // Create LoginPublicAccountUserView and add it as child view.
  // |auth_user_| and |parent_acesss_| will be deleted if exists to ensure the
  // single child.
  void CreatePublicAccount(const mojom::LoginUserInfoPtr& user);

  // Either |auth_user_| or |public_account_| must be null.
  LoginPublicAccountUserView* public_account_ = nullptr;
  LoginAuthUserView* auth_user_ = nullptr;

  // It can be only used together with |auth_user_|. It is disallowed with
  // |public_account_|.
  ParentAccessView* parent_access_ = nullptr;

  LoginAuthUserView::Callbacks auth_user_callbacks_;
  LoginPublicAccountUserView::Callbacks public_account_callbacks_;
  ParentAccessView::Callbacks parent_access_callbacks_;

  ScopedObserver<WallpaperController, LoginBigUserView> observer_{this};

  DISALLOW_COPY_AND_ASSIGN(LoginBigUserView);
};

}  // namespace ash

#endif  // ASH_LOGIN_UI_LOGIN_BIG_USER_VIEW_H_