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// Copyright (c) 2012 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_AURA_WINDOW_OBSERVER_H_
#define UI_AURA_WINDOW_OBSERVER_H_
#pragma once
#include "ui/aura/aura_export.h"
namespace gfx {
class Rect;
} // namespace gfx
namespace aura {
class Window;
class AURA_EXPORT WindowObserver {
public:
// Invoked when |new_window| has been added as a child of this window.
virtual void OnWindowAdded(Window* new_window) {}
// Invoked prior to removing |window| as a child of this window.
virtual void OnWillRemoveWindow(Window* window) {}
// Invoked when this window's parent window changes. |parent| may be NULL.
virtual void OnWindowParentChanged(Window* window, Window* parent) {}
// Invoked when SetProperty(), ClearProperty(), or
// NativeWidgetAura::SetNativeWindowProperty() is called on the window.
// |key| is either a WindowProperty<T>* (SetProperty, ClearProperty)
// or a const char* (SetNativeWindowProperty). Either way, it can simply be
// compared for equality with the property constant. |old| is the old property
// value, which must be cast to the appropriate type before use.
virtual void OnWindowPropertyChanged(Window* window,
const void* key,
intptr_t old) {}
// Invoked when SetVisible() is invoked on a window. |visible| is the
// value supplied to SetVisible(). If |visible| is true, window->IsVisible()
// may still return false. See description in Window::IsVisible() for details.
virtual void OnWindowVisibilityChanged(Window* window, bool visible) {}
// Invoked when SetBounds() is invoked on |window|. |bounds| contains the
// window's new bounds.
virtual void OnWindowBoundsChanged(Window* window, const gfx::Rect& bounds) {}
// Invoked when |window|'s position among its siblings in the stacking order
// has changed.
virtual void OnWindowStackingChanged(Window* window) {}
// Invoked when a region of |window| is scheduled to be redrawn.
virtual void OnWindowPaintScheduled(Window* window,
const gfx::Rect& region) {}
// Invoked when the Window is being destroyed (i.e. from the start of its
// destructor). This is called before the window is removed from its parent.
virtual void OnWindowDestroying(Window* window) {}
// Invoked when the Window has been destroyed (i.e. at the end of its
// destructor). This is called after the window is removed from its parent.
virtual void OnWindowDestroyed(Window* window) {}
// Called when a Window has been added to a RootWindow.
virtual void OnWindowAddedToRootWindow(Window* window) {}
// Called when a Window is about to be removed from a RootWindow.
virtual void OnWindowRemovingFromRootWindow(Window* window) {}
protected:
virtual ~WindowObserver() {}
};
} // namespace aura
#endif // UI_AURA_WINDOW_OBSERVER_H_
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