ash/common/wm_shell_common.h

// Copyright 2016 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_COMMON_WM_SHELL_COMMON_H_
#define ASH_COMMON_WM_SHELL_COMMON_H_

#include <memory>

#include "ash/ash_export.h"
#include "base/macros.h"
#include "base/observer_list.h"

namespace ash {

class MruWindowTracker;
class ShellObserver;
class WmWindow;

// Contains code used by both shell implementations.
class ASH_EXPORT WmShellCommon {
 public:
  WmShellCommon();
  ~WmShellCommon();

  MruWindowTracker* mru_window_tracker() { return mru_window_tracker_.get(); }

  void CreateMruWindowTracker();
  void DeleteMruWindowTracker();

  // ShellObserver related functions:
  void AddShellObserver(ShellObserver* observer);
  void RemoveShellObserver(ShellObserver* observer);
  base::ObserverList<ShellObserver>* shell_observers() {
    return &shell_observers_;
  }

  // Notifies |observers_| when entering or exiting pinned mode for
  // |pinned_window|. Entering or exiting can be checked by looking at
  // |pinned_window|'s window state.
  void NotifyPinnedStateChanged(WmWindow* pinned_window);

 private:
  std::unique_ptr<MruWindowTracker> mru_window_tracker_;

  base::ObserverList<ShellObserver> shell_observers_;

  DISALLOW_COPY_AND_ASSIGN(WmShellCommon);
};

}  // namespace ash

#endif  // ASH_COMMON_WM_SHELL_COMMON_H_