chromium/ui/wm/core/transient_window_manager.h

// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_WM_CORE_TRANSIENT_WINDOW_MANAGER_H_
#define UI_WM_CORE_TRANSIENT_WINDOW_MANAGER_H_

#include <vector>

#include "base/component_export.h"
#include "base/memory/raw_ptr.h"
#include "base/observer_list.h"
#include "ui/aura/window_observer.h"

namespace wm {

class TransientWindowObserver;

// TransientWindowManager manages the set of transient children for a window
// along with the transient parent. Transient children get the following
// behavior:
// . The transient parent destroys any transient children when it is
//   destroyed. This means a transient child is destroyed if either its parent
//   or transient parent is destroyed.
// . If a transient child and its transient parent share the same parent, then
//   transient children are always ordered above the transient parent.
// . If a transient parent is hidden, it hides all transient children.
//   For show operation, please refer to |set_parent_controls_visibility(bool)|.
// Transient windows are typically used for popups and menus.
class COMPONENT_EXPORT(UI_WM) TransientWindowManager
    : public aura::WindowObserver { … };

}  // namespace wm

#endif  // UI_WM_CORE_TRANSIENT_WINDOW_MANAGER_H_