gecko-dev/view/public/nsIViewObserver.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#ifndef nsIViewObserver_h___
#define nsIViewObserver_h___
#include "nsISupports.h"
#include "nsGUIEvent.h"
class nsIRenderingContext;
struct nsRect;
#define NS_IVIEWOBSERVER_IID \
{ 0x6a1529e0, 0x3d2c, 0x11d2, \
{ 0xa8, 0x32, 0x00, 0x40, 0x95, 0x9a, 0x28, 0xc9 } }
class nsIViewObserver : public nsISupports
{
public:
static const nsIID& GetIID() { static nsIID iid = NS_IVIEWOBSERVER_IID; return iid; }
/* called when the observer needs to paint
* @param aRenderingContext - rendering context to paint to
* @param aDirtyRect - rectangle of dirty area
* @return error status
*/
NS_IMETHOD Paint(nsIView * aView,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect) = 0;
/* called when the observer needs to handle an event
* @param aEvent - event notification
* @param aEventStatus - out parameter for event handling
* status
* @return error status
*/
NS_IMETHOD HandleEvent(nsIView * aView,
nsGUIEvent* aEvent,
nsEventStatus& aEventStatus) = 0;
/* called when the view has been repositioned due to scrolling
* @return error status
*/
NS_IMETHOD Scrolled(nsIView * aView) = 0;
/* called when the view has been resized and the
* content within the view needs to be reflowed.
* @param aWidth - new width of view
* @param aHeight - new height of view
* @return error status
*/
NS_IMETHOD ResizeReflow(nsIView * aView, nscoord aWidth, nscoord aHeight) = 0;
};
#endif