gecko/layout/generic/nsImageMap.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla 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/MPL/
*
* 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 the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* code for HTML client-side image maps */
#ifndef nsImageMap_h
#define nsImageMap_h
#include "nsISupports.h"
#include "nsCoord.h"
#include "nsTArray.h"
#include "nsStubMutationObserver.h"
#include "nsIDOMEventListener.h"
#include "nsIFrame.h"
class Area;
class nsIDOMEvent;
class nsRenderingContext;
class nsImageFrame;
class nsImageMap : public nsStubMutationObserver,
public nsIDOMEventListener
{
public:
nsImageMap();
nsresult Init(nsImageFrame* aImageFrame, nsIContent* aMap);
/**
* Return the first area element (in content order) for the given aX,aY pixel
* coordinate or nsnull if the coordinate is outside all areas.
*/
nsIContent* GetArea(nscoord aX, nscoord aY) const;
/**
* Return area elements count associated with the image map.
*/
PRUint32 AreaCount() const { return mAreas.Length(); }
/**
* Return area element at the given index.
*/
nsIContent* GetAreaAt(PRUint32 aIndex) const;
void Draw(nsIFrame* aFrame, nsRenderingContext& aRC);
/**
* Called just before the nsImageFrame releases us.
* Used to break the cycle caused by the DOM listener.
*/
void Destroy();
// nsISupports
NS_DECL_ISUPPORTS
// nsIMutationObserver
NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
NS_DECL_NSIMUTATIONOBSERVER_PARENTCHAINCHANGED
//nsIDOMEventListener
NS_DECL_NSIDOMEVENTLISTENER
nsresult GetBoundsForAreaContent(nsIContent *aContent,
nsRect& aBounds);
protected:
virtual ~nsImageMap();
void FreeAreas();
nsresult UpdateAreas();
nsresult SearchForAreas(nsIContent* aParent, bool& aFoundArea,
bool& aFoundAnchor);
nsresult AddArea(nsIContent* aArea);
void MaybeUpdateAreas(nsIContent *aContent);
nsImageFrame* mImageFrame; // the frame that owns us
nsCOMPtr<nsIContent> mMap;
nsAutoTArray<Area*, 8> mAreas; // almost always has some entries
bool mContainsBlockContents;
};
#endif /* nsImageMap_h */