| // Copyright 2013 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 UI_VIEWS_WIDGET_WINDOW_REORDERER_H_ |
| #define UI_VIEWS_WIDGET_WINDOW_REORDERER_H_ |
| |
| #include <memory> |
| |
| #include "base/compiler_specific.h" |
| #include "base/macros.h" |
| #include "ui/aura/window_observer.h" |
| |
| namespace aura { |
| class Window; |
| } |
| |
| namespace views { |
| class View; |
| |
| // Class which reorders the widget's child windows which have an associated view |
| // in the widget's view tree according the z-order of the views in the view |
| // tree. Windows not associated to a view are stacked above windows with an |
| // associated view. The child windows' layers are additionally reordered |
| // according to the z-order of the associated views relative to views with |
| // layers. |
| class WindowReorderer : public aura::WindowObserver { |
| public: |
| WindowReorderer(aura::Window* window, View* root_view); |
| ~WindowReorderer() override; |
| |
| // Explicitly reorder the children of |window_| (and their layers). This |
| // method should be called when the position of a view with an associated |
| // window changes in the view hierarchy. This method assumes that the |
| // child layers of |window_| which are owned by views are already in the |
| // correct z-order relative to each other and does no reordering if there |
| // are no views with an associated window. |
| void ReorderChildWindows(); |
| |
| private: |
| // aura::WindowObserver overrides: |
| void OnWindowAdded(aura::Window* new_window) override; |
| void OnWillRemoveWindow(aura::Window* window) override; |
| void OnWindowDestroying(aura::Window* window) override; |
| |
| // The window and the root view of the native widget which owns the |
| // WindowReorderer. |
| aura::Window* parent_window_; |
| View* root_view_; |
| |
| // Reorders windows as a result of the kHostViewKey being set on a child of |
| // |parent_window_|. |
| class AssociationObserver; |
| std::unique_ptr<AssociationObserver> association_observer_; |
| |
| DISALLOW_COPY_AND_ASSIGN(WindowReorderer); |
| }; |
| |
| } // namespace views |
| |
| #endif // UI_VIEWS_WIDGET_WINDOW_REORDERER_H_ |