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818aafcc15
sync and which return async, move the handling of alternates more completely into the CSSLoader, make it possible for observers to tell whether the load actually succeeded. Bug 293825, r+sr=peterv
230 lines
9.9 KiB
C++
230 lines
9.9 KiB
C++
/* -*- Mode: C++; 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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#ifndef nsICSSLoader_h___
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#define nsICSSLoader_h___
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#include "nsISupports.h"
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#include "nsSubstring.h"
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#include "nsCompatibility.h"
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class nsIAtom;
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class nsIURI;
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class nsICSSParser;
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class nsICSSStyleSheet;
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class nsPresContext;
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class nsIContent;
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class nsIParser;
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class nsIDocument;
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class nsIUnicharInputStream;
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class nsICSSLoaderObserver;
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class nsMediaList;
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class nsICSSImportRule;
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// IID for the nsICSSLoader interface
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// ff43802a-b355-41f2-919d-5c7ab3dbfb91
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#define NS_ICSS_LOADER_IID \
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{0xff43802a, 0xb355, 0x41f2, {0x91, 0x9d, 0x5c, 0x7a, 0xb3, 0xdb, 0xfb, 0x91}}
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typedef void (*nsCSSLoaderCallbackFunc)(nsICSSStyleSheet* aSheet, void *aData, PRBool aDidNotify);
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class nsICSSLoader : public nsISupports {
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public:
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NS_DEFINE_STATIC_IID_ACCESSOR(NS_ICSS_LOADER_IID)
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NS_IMETHOD Init(nsIDocument* aDocument) = 0;
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NS_IMETHOD DropDocumentReference(void) = 0; // notification that doc is going away
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NS_IMETHOD SetCaseSensitive(PRBool aCaseSensitive) = 0;
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NS_IMETHOD SetCompatibilityMode(nsCompatibility aCompatMode) = 0;
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NS_IMETHOD SetPreferredSheet(const nsAString& aTitle) = 0;
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NS_IMETHOD GetPreferredSheet(nsAString& aTitle) = 0;
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// Get/Recycle a CSS parser for general use
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NS_IMETHOD GetParserFor(nsICSSStyleSheet* aSheet,
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nsICSSParser** aParser) = 0;
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NS_IMETHOD RecycleParser(nsICSSParser* aParser) = 0;
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// XXXbz sort out what the deal is with events! When should they fire?
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/**
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* Load an inline style sheet. If a successful result is returned and
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* *aCompleted is false, then aObserver is guaranteed to be notified
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* asynchronously once the sheet is marked complete. If an error is
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* returned, or if *aCompleted is true, aObserver will not be notified. In
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* addition to parsing the sheet, this method will insert it into the
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* stylesheet list of this CSSLoader's document.
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*
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* @param aElement the element linking to the stylesheet. This must not be
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* null and must implement nsIStyleSheetLinkingElement.
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* @param aStream the character stream that holds the stylesheet data.
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* @param aLineNumber the line number at which the stylesheet data started.
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* @param aTitle the title of the sheet.
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* @param aMedia the media string for the sheet.
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* @param aParserToUnblock the parser to unblock when the load completes.
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* Only loads that returned false for both aIsAlternate and
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* aCompleted will unblock the parser.
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* @param aObserver the observer to notify when the load completes.
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* May be null.
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* @param [out] aCompleted whether parsing of the sheet completed.
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* @param [out] aIsAlternate whether the stylesheet ended up being an
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* alternate sheet.
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*/
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NS_IMETHOD LoadInlineStyle(nsIContent* aElement,
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nsIUnicharInputStream* aStream,
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PRUint32 aLineNumber,
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const nsSubstring& aTitle,
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const nsSubstring& aMedia,
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nsIParser* aParserToUnblock,
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nsICSSLoaderObserver* aObserver,
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PRBool* aCompleted,
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PRBool* aIsAlternate) = 0;
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/**
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* Load a linked (document) stylesheet. If a successful result is returned,
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* aObserver is guaranteed to be notified asynchronously once the sheet is
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* loaded and marked complete. If an error is returned, aObserver will not
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* be notified. In addition to loading the sheet, this method will insert it
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* into the stylesheet list of this CSSLoader's document.
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*
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* @param aElement the element linking to the the stylesheet. May be null.
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* @param aURL the URL of the sheet.
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* @param aTitle the title of the sheet.
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* @param aMedia the media string for the sheet.
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* @param aHasAlternateRel whether the rel for this link included
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* "alternate".
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* @param aParserToUnblock the parser to unblock when the load completes.
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* Only loads that returned false for aIsAlternate will unblock
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* the parser.
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* @param aObserver the observer to notify when the load completes.
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* May be null.
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* @param [out] aIsAlternate whether the stylesheet actually ended up beinga
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* an alternate sheet. Note that this need not match
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* aHasAlternateRel.
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*/
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NS_IMETHOD LoadStyleLink(nsIContent* aElement,
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nsIURI* aURL,
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const nsSubstring& aTitle,
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const nsSubstring& aMedia,
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PRBool aHasAlternateRel,
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nsIParser* aParserToUnblock,
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nsICSSLoaderObserver* aObserver,
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PRBool* aIsAlternate) = 0;
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/**
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* Load a child (@import-ed) style sheet. In addition to loading the sheet,
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* this method will insert it into the child sheet list of aParentSheet. If
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* there is no sheet currently being parsed and the child sheet is not
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* complete when this method returns, then when the child sheet becomes
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* complete aParentSheet will be QIed to nsICSSLoaderObserver and
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* asynchronously notified, just like for LoadStyleLink. Note that if the
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* child sheet is already complete when this method returns, no
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* nsICSSLoaderObserver notification will be sent.
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*
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* @param aParentSheet the parent of this child sheet
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* @param aURL the URL of the child sheet
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* @param aMedia the already-parsed media list for the child sheet
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* @param aRule the @import rule importing this child. This is used to
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* properly order the child sheet list of aParentSheet.
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*/
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NS_IMETHOD LoadChildSheet(nsICSSStyleSheet* aParentSheet,
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nsIURI* aURL,
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nsMediaList* aMedia,
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nsICSSImportRule* aRule) = 0;
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/**
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* Synchronously load and return the stylesheet at aURL. Any child sheets
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* will also be loaded synchronously. Note that synchronous loads over some
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* protocols may involve spinning up a new event loop, so use of this method
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* does NOT guarantee not receiving any events before the sheet loads. This
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* method can be used to load sheets not associated with a document.
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*
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* @param aURL the URL of the sheet to load
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* @param [out] aSheet the loaded, complete sheet.
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*
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* NOTE: At the moment, this method assumes the sheet will be UTF-8, but
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* ideally it would allow arbitrary encodings. Callers should NOT depend on
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* non-UTF8 sheets being treated as UTF-8 by this method.
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*
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* NOTE: A successful return from this method doesn't indicate anything about
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* whether the data could be parsed as CSS and doesn't indicate anything
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* about the status of child sheets of the returned sheet.
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*/
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NS_IMETHOD LoadSheetSync(nsIURI* aURL, nsICSSStyleSheet** aSheet) = 0;
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/**
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* Asynchronously load the stylesheet at aURL. If a successful result is
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* returned, aObserver is guaranteed to be notified asynchronously once the
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* sheet is loaded and marked complete. This method can be used to load
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* sheets not associated with a document.
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*
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* @param aURL the URL of the sheet to load
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* @param aObserver the observer to notify when the load completes.
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* Must not be null.
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*/
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NS_IMETHOD LoadSheet(nsIURI* aURL, nsICSSLoaderObserver* aObserver) = 0;
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/**
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* Stop loading all sheets. All nsICSSLoaderObservers involved will be
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* notified with NS_BINDING_ABORTED as the status, possibly synchronously.
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*/
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NS_IMETHOD Stop(void) = 0;
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/**
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* Stop loading one sheet. The nsICSSLoaderObserver involved will be
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* notified with NS_BINDING_ABORTED as the status, possibly synchronously.
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*/
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NS_IMETHOD StopLoadingSheet(nsIURI* aURL) = 0;
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/**
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* Whether the loader is enabled or not.
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* When disabled, processing of new styles is disabled and an attempt
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* to do so will fail with a return code of
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* NS_ERROR_NOT_AVAILABLE. Note that this DOES NOT disable
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* currently loading styles or already processed styles.
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*/
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NS_IMETHOD GetEnabled(PRBool *aEnabled) = 0;
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NS_IMETHOD SetEnabled(PRBool aEnabled) = 0;
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};
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nsresult
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NS_NewCSSLoader(nsIDocument* aDocument, nsICSSLoader** aLoader);
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nsresult
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NS_NewCSSLoader(nsICSSLoader** aLoader);
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#endif /* nsICSSLoader_h___ */
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