// 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 "base/compiler_specific.h" #include "base/memory/scoped_ptr.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); virtual ~WindowReorderer(); // 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: virtual void OnWindowAdded(aura::Window* new_window) OVERRIDE; virtual void OnWillRemoveWindow(aura::Window* window) OVERRIDE; virtual 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; scoped_ptr<AssociationObserver> association_observer_; DISALLOW_COPY_AND_ASSIGN(WindowReorderer); }; } // namespace views #endif // UI_VIEWS_WIDGET_WINDOW_REORDERER_H_