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168 lines
7.6 KiB
Plaintext
168 lines
7.6 KiB
Plaintext
/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1999
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsISupports.idl"
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interface nsIRequest;
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interface nsIStreamListener;
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interface nsIURI;
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/**
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* nsIURIContentListener is an interface used by components which
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* want to know (and have a chance to handle) a particular content type.
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* Typical usage scenarios will include running applications which register
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* a nsIURIContentListener for each of its content windows with the uri
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* dispatcher service.
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*
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* @status FROZEN
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*/
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[scriptable, uuid(94928AB3-8B63-11d3-989D-001083010E9B)]
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interface nsIURIContentListener : nsISupports
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{
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/**
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* Gives the original content listener first crack at stopping a load before
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* it happens.
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*
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* @param aURI URI that is being opened.
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*
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* @return <code>false</code> if the load can continue;
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* <code>true</code> if the open should be aborted.
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*/
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boolean onStartURIOpen(in nsIURI aURI);
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/**
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* Notifies the content listener to hook up an nsIStreamListener capable of
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* consuming the data stream.
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*
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* @param aContentType Content type of the data.
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* @param aIsContentPreferred Indicates whether the content should be
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* preferred by this listener.
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* @param aRequest Request that is providing the data.
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* @param aContentHandler nsIStreamListener that will consume the data.
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* This should be set to <code>nsnull</code> if
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* this content listener can't handle the content
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* type.
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*
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* @return <code>true</code> if the consumer wants to
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* handle the load completely by itself. This
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* causes the URI Loader do nothing else...
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* <code>false</code> if the URI Loader should
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* continue handling the load and call the
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* returned streamlistener's methods.
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*/
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boolean doContent(in string aContentType,
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in boolean aIsContentPreferred,
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in nsIRequest aRequest,
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out nsIStreamListener aContentHandler);
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/**
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* When given a uri to dispatch, if the URI is specified as 'preferred
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* content' then the uri loader tries to find a preferred content handler
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* for the content type. The thought is that many content listeners may
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* be able to handle the same content type if they have to. i.e. the mail
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* content window can handle text/html just like a browser window content
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* listener. However, if the user clicks on a link with text/html content,
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* then the browser window should handle that content and not the mail
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* window where the user may have clicked the link. This is the difference
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* between isPreferred and canHandleContent.
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*
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* @param aContentType Content type of the data.
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* @param aDesiredContentType Indicates that aContentType must be converted
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* to aDesiredContentType before processing the
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* data. This causes a stream converted to be
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* inserted into the nsIStreamListener chain.
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* This argument can be <code>nsnull</code> if
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* the content should be consumed directly as
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* aContentType.
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*
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* @return <code>true</code> if this is a preferred
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* content handler for aContentType;
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* <code>false<code> otherwise.
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*/
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boolean isPreferred(in string aContentType, out string aDesiredContentType);
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/**
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* When given a uri to dispatch, if the URI is not specified as 'preferred
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* content' then the uri loader calls canHandleContent to see if the content
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* listener is capable of handling the content.
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*
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* @param aContentType Content type of the data.
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* @param aIsContentPreferred Indicates whether the content should be
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* preferred by this listener.
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* @param aDesiredContentType Indicates that aContentType must be converted
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* to aDesiredContentType before processing the
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* data. This causes a stream converted to be
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* inserted into the nsIStreamListener chain.
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* This argument can be <code>nsnull</code> if
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* the content should be consumed directly as
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* aContentType.
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*
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* @return <code>true</code> if the data can be consumed.
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* <code>false</code> otherwise.
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*
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* Note: I really envision canHandleContent as a method implemented
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* by the docshell as the implementation is generic to all doc
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* shells. The isPreferred decision is a decision made by a top level
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* application content listener that sits at the top of the docshell
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* hierarchy.
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*/
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boolean canHandleContent(in string aContentType,
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in boolean aIsContentPreferred,
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out string aDesiredContentType);
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/**
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* The load context associated with a particular content listener.
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* The URI Loader stores and accesses this value as needed.
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*/
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attribute nsISupports loadCookie;
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/**
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* The parent content listener if this particular listener is part of a chain
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* of content listeners (i.e. a docshell!)
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*
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* @note If this attribute is set to an object that implements
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* nsISupportsWeakReference, the implementation should get the
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* nsIWeakReference and hold that. Otherwise, the implementation
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* should not refcount this interface; it should assume that a non
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* null value is always valid. In that case, the caller is
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* responsible for explicitly setting this value back to null if the
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* parent content listener is destroyed.
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*/
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attribute nsIURIContentListener parentContentListener;
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};
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