gecko-dev/gfx/public/nsIImageRequest.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 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#ifndef nsIImageRequest_h___
#define nsIImageRequest_h___
#include <stdio.h>
#include "nsISupports.h"
#include "nscore.h"
class nsIImageRequestObserver;
class nsIImage;
// IID for the nsIImageRequest interface
#define NS_IIMAGEREQUEST_IID \
{ 0xc31444c0, 0xaec9, 0x11d1, \
{ 0x9b, 0xc3, 0x00, 0x60, 0x08, 0x8c, 0xa6, 0xb3 } }
/**
*
* An image request generated as a result of invoking the
* <code>GetImage</code> method of the <code>nsIImageGroup</code>
* interface.
*/
class nsIImageRequest : public nsISupports {
public:
NS_DEFINE_STATIC_IID_ACCESSOR(NS_IIMAGEREQUEST_IID)
/// @return the image object associated with the request.
virtual nsIImage* GetImage() = 0;
/**
* Returns the natural dimensions of the image. Returns 0,0
* if the dimensions are unknown.
*
* Note: the dimensions that are returned are in pixels
*
* @param aWidth, aHeight - pointers to integers to be filled in with
* the dimensions.
*/
virtual void GetNaturalDimensions(PRUint32 *aWidth, PRUint32 *aHeight) = 0;
/**
* Add an observers to be informed of image loading notifications.
*
* @param aObserver - An observer to add to the observer list.
* @param boolean indicating whether addition was successful.
*/
virtual PRBool AddObserver(nsIImageRequestObserver *aObserver) = 0;
/**
* Remove a previously added observer from the observer list.
*
* @param aObserver - An observer to remove from the observer list.
* @param boolean indicating whether the removal was successful.
*/
virtual PRBool RemoveObserver(nsIImageRequestObserver *aObserver) = 0;
/// Interrupt loading of just this image.
virtual void Interrupt() = 0;
};
#endif