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// 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);
~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;
scoped_ptr<AssociationObserver> association_observer_;
DISALLOW_COPY_AND_ASSIGN(WindowReorderer);
};
} // namespace views
#endif // UI_VIEWS_WIDGET_WINDOW_REORDERER_H_
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