mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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121 lines
4.0 KiB
C++
121 lines
4.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=2 sw=2 et tw=78: */
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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 Mozilla.org.
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* Portions created by the Initial Developer are Copyright (C) 2008
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Robert O'Callahan <robert@ocallahan.org>
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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 NSREFERENCEDELEMENT_H_
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#define NSREFERENCEDELEMENT_H_
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#include "nsIContent.h"
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#include "nsIAtom.h"
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#include "nsIDocument.h"
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#include "nsThreadUtils.h"
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#include "nsAutoPtr.h"
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class nsIURI;
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class nsCycleCollectionCallback;
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/**
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* Class to track what content is referenced by a given ID.
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*
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* By default this is a single-shot tracker --- i.e., when ContentChanged
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* fires, we will automatically stop tracking. Override IsPersistent
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* to return PR_TRUE if you want to keep tracking after the content for
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* an ID has changed.
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*/
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class nsReferencedElement {
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public:
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nsReferencedElement() {}
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~nsReferencedElement() {
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Unlink();
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if (mPendingNotification) {
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mPendingNotification->Clear();
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}
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}
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nsIContent* get() { return mContent; }
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void Reset(nsIContent* aFrom, nsIURI* aURI, PRBool aWatch = PR_TRUE);
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void Unlink();
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void Traverse(nsCycleCollectionTraversalCallback* aCB);
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protected:
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/**
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* Override this to be notified of content changes. Don't forget
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* to call this method to change mContent.
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*/
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virtual void ContentChanged(nsIContent* aFrom, nsIContent* aTo) {
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mContent = aTo;
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}
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/**
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* Override this to convert from a single-shot notification to
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* a persistent notification.
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*/
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virtual PRBool IsPersistent() { return PR_FALSE; }
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private:
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static PRBool Observe(nsIContent* aOldContent,
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nsIContent* aNewContent, void* aData);
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class Notification : public nsRunnable {
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public:
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Notification(nsReferencedElement* aTarget, nsIContent* aFrom, nsIContent* aTo)
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: mTarget(aTarget), mFrom(aFrom), mTo(aTo) {}
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virtual nsresult Run() {
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if (mTarget) {
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mTarget->mPendingNotification = nsnull;
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mTarget->ContentChanged(mFrom, mTo);
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}
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return NS_OK;
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}
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void SetTo(nsIContent* aTo) { mTo = aTo; }
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void Clear() { mTarget = nsnull; mFrom = nsnull; mTo = nsnull; }
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private:
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nsReferencedElement* mTarget;
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nsCOMPtr<nsIContent> mFrom;
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nsCOMPtr<nsIContent> mTo;
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};
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friend class Notification;
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nsCOMPtr<nsIAtom> mWatchID;
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nsCOMPtr<nsIDocument> mWatchDocument;
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nsCOMPtr<nsIContent> mContent;
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nsRefPtr<Notification> mPendingNotification;
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};
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#endif /*NSREFERENCEDELEMENT_H_*/
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