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nsILink.h
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2006-05-08
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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):
* L. David Baron <dbaron@dbaron.org>
*
* 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 ***** */
#ifndef nsILink_h___
#define nsILink_h___
#include "nsISupports.h"
#include "nsILinkHandler.h" // definition of nsLinkState
class nsIURI;
// IID for the nsILink interface
#define NS_ILINK_IID \
{ 0x0c212bc4, 0xfcd7, 0x479d, \
{ 0x8c, 0x3f, 0x3b, 0xe8, 0xe6, 0x78, 0x74, 0x50 } }
/**
* This interface allows SelectorMatches to get the canonical
* URL pointed to by an element representing a link and allows
* it to store the visited state of a link element in the link.
* It is needed for performance reasons (to prevent copying of
* strings and excessive calls to history).
*/
class nsILink : public nsISupports {
public:
NS_DEFINE_STATIC_IID_ACCESSOR(NS_ILINK_IID)
/**
* Get the cached state of the link. If the state is unknown,
* return eLinkState_Unknown.
*
* @param aState [out] The cached link state of the link.
* @return NS_OK
*/
NS_IMETHOD GetLinkState(nsLinkState &aState) = 0;
/**
* Set the cached state of the link.
*
* @param aState The cached link state of the link.
* @return NS_OK
*/
NS_IMETHOD SetLinkState(nsLinkState aState) = 0;
/**
* Get a pointer to the fully href URI (fully resolved and canonicalized,
* since it's an nsIURI object).
*
* @param aURI [out] A pointer to be filled in with a pointer to the URI
* If the element has no HREF attribute, it is set to nsnull.
* @return NS_OK if the out pointer is filled in (possibly with nsnull)
*/
NS_IMETHOD GetHrefURI(nsIURI** aURI) = 0;
/**
* Dispatch a LinkAdded event to the nsIChromeEventHandler for this document.
* This is used to notify the chrome listeners when restoring a page
* presentation. Currently, this only applies to HTML <link> elements.
*/
NS_IMETHOD LinkAdded() = 0;
/**
* Dispatch a LinkRemoved event to the nsIChromeEventHandler for this
* document. This is used to notify the chrome listeners when saving a page
* presentation (since the document is not torn down). Currently, this only
* applies to HTML <link> elements.
*/
NS_IMETHOD LinkRemoved() = 0;
};
#endif /* nsILink_h___ */