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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 Communicator client 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 ***** */
#ifndef nsILinkHandler_h___
#define nsILinkHandler_h___

#include "nsISupports.h"
#include "nsIContent.h"

class nsIInputStream;
class nsIDocShell;
class nsIRequest;
class nsString;
class nsGUIEvent;

// Interface ID for nsILinkHandler
#define NS_ILINKHANDLER_IID \
  { 0xd85670a1, 0x224a, 0x4562, \
    { 0x87, 0xa9, 0x43, 0xa5, 0x24, 0xe7, 0xd0, 0x1b } }

/**
 * Interface used for handling clicks on links
 */
class nsILinkHandler : public nsISupports {
public:
  NS_DECLARE_STATIC_IID_ACCESSOR(NS_ILINKHANDLER_IID)

  /**
   * Process a click on a link.
   *
   * @param aContent the content for the frame that generated the trigger
   * @param aURI a URI object that defines the destination for the link
   * @param aTargetSpec indicates where the link is targeted (may be an empty
   *        string)
   * @param aPostDataStream the POST data to send
   * @param aHeadersDataStream ???
   * @param aIsTrusted false if the triggerer is an untrusted DOM event.
   */
  NS_IMETHOD OnLinkClick(nsIContent* aContent, 
                         nsIURI* aURI,
                         const PRUnichar* aTargetSpec,
                         nsIInputStream* aPostDataStream,
                         nsIInputStream* aHeadersDataStream,
                         bool aIsTrusted) = 0;

  /**
   * Process a click on a link.
   *
   * Works the same as OnLinkClick() except it happens immediately rather than
   * through an event.
   *
   * @param aContent the content for the frame that generated the trigger
   * @param aURI a URI obect that defines the destination for the link
   * @param aTargetSpec indicates where the link is targeted (may be an empty
   *        string)
   * @param aPostDataStream the POST data to send
   * @param aHeadersDataStream ???
   * @param aDocShell (out-param) the DocShell that the request was opened on
   * @param aRequest the request that was opened
   */
  NS_IMETHOD OnLinkClickSync(nsIContent* aContent, 
                             nsIURI* aURI,
                             const PRUnichar* aTargetSpec,
                             nsIInputStream* aPostDataStream = 0,
                             nsIInputStream* aHeadersDataStream = 0,
                             nsIDocShell** aDocShell = 0,
                             nsIRequest** aRequest = 0) = 0;

  /**
   * Process a mouse-over a link.
   *
   * @param aContent the linked content.
   * @param aURI an URI object that defines the destination for the link
   * @param aTargetSpec indicates where the link is targeted (it may be an empty
   *        string)
   */
  NS_IMETHOD OnOverLink(nsIContent* aContent, 
                        nsIURI* aURLSpec,
                        const PRUnichar* aTargetSpec) = 0;

  /**
   * Process the mouse leaving a link.
   */
  NS_IMETHOD OnLeaveLink() = 0;
};

NS_DEFINE_STATIC_IID_ACCESSOR(nsILinkHandler, NS_ILINKHANDLER_IID)

#endif /* nsILinkHandler_h___ */