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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_DELEGATE_H_
#define UI_AURA_WINDOW_DELEGATE_H_
#pragma once
#include "ui/aura/aura_export.h"
#include "ui/base/events.h"
#include "ui/gfx/native_widget_types.h"
namespace gfx {
class Canvas;
class Point;
class Rect;
class Size;
}
namespace aura {
class Event;
class GestureEvent;
class KeyEvent;
class MouseEvent;
class TouchEvent;
// Delegate interface for aura::Window.
class AURA_EXPORT WindowDelegate {
public:
// Returns the window's minimum size, or size 0,0 if there is no limit.
virtual gfx::Size GetMinimumSize() const = 0;
// Called when the Window's position and/or size changes.
virtual void OnBoundsChanged(const gfx::Rect& old_bounds,
const gfx::Rect& new_bounds) = 0;
// Sent to the Window's delegate when the Window gains or loses focus.
virtual void OnFocus() = 0;
virtual void OnBlur() = 0;
virtual bool OnKeyEvent(KeyEvent* event) = 0;
// Returns the native cursor for the specified point, in window coordinates,
// or NULL for the default cursor.
virtual gfx::NativeCursor GetCursor(const gfx::Point& point) = 0;
// Returns the non-client component (see hit_test.h) containing |point|, in
// window coordinates.
virtual int GetNonClientComponent(const gfx::Point& point) const = 0;
virtual bool OnMouseEvent(MouseEvent* event) = 0;
virtual ui::TouchStatus OnTouchEvent(TouchEvent* event) = 0;
virtual ui::GestureStatus OnGestureEvent(GestureEvent* event) = 0;
// Returns true of the window can be focused.
virtual bool CanFocus() = 0;
// Invoked when mouse capture is lost on the window.
virtual void OnCaptureLost() = 0;
// Asks the delegate to paint window contents into the supplied canvas.
virtual void OnPaint(gfx::Canvas* canvas) = 0;
// Called from Window's destructor before OnWindowDestroyed and before the
// children have been destroyed and the window has been removed from its
// parent.
virtual void OnWindowDestroying() = 0;
// Called when the Window has been destroyed (i.e. from its destructor). This
// is called after OnWindowDestroying and after the children have been
// deleted and the window has been removed from its parent.
// The delegate can use this as an opportunity to delete itself if necessary.
virtual void OnWindowDestroyed() = 0;
// Called when the visibility of a Window changed.
virtual void OnWindowVisibilityChanged(bool visible) = 0;
protected:
virtual ~WindowDelegate() {}
};
} // namespace aura
#endif // UI_AURA_WINDOW_DELEGATE_H_
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