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lightning-sunbird  0.9+nobinonly
nsSVGValue.cpp
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is the Mozilla SVG project.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Crocodile Clips Ltd..
00019  * Portions created by the Initial Developer are Copyright (C) 2001
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *   Alex Fritze <alex.fritze@crocodile-clips.com> (original author)
00024  *
00025  * Alternatively, the contents of this file may be used under the terms of
00026  * either of the GNU General Public License Version 2 or later (the "GPL"),
00027  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00028  * in which case the provisions of the GPL or the LGPL are applicable instead
00029  * of those above. If you wish to allow use of your version of this file only
00030  * under the terms of either the GPL or the LGPL, and not to allow others to
00031  * use your version of this file under the terms of the MPL, indicate your
00032  * decision by deleting the provisions above and replace them with the notice
00033  * and other provisions required by the GPL or the LGPL. If you do not delete
00034  * the provisions above, a recipient may use your version of this file under
00035  * the terms of any one of the MPL, the GPL or the LGPL.
00036  *
00037  * ***** END LICENSE BLOCK ***** */
00038 
00039 #include "nsSVGValue.h"
00040 #include "nsIWeakReference.h"
00041 
00042 nsSVGValue::nsSVGValue()
00043     : mModifyNestCount(0)
00044 {
00045 }
00046 
00047 nsSVGValue::~nsSVGValue()
00048 {
00049   ReleaseObservers();
00050 }
00051 
00052 void
00053 nsSVGValue::ReleaseObservers()
00054 {
00055   PRInt32 count = mObservers.Count();
00056   PRInt32 i;
00057   for (i = 0; i < count; ++i) {
00058     nsIWeakReference* wr = NS_STATIC_CAST(nsIWeakReference*,mObservers.ElementAt(i));
00059     NS_RELEASE(wr);
00060   }
00061   while (i)
00062     mObservers.RemoveElementAt(--i);
00063 }
00064 
00065 void
00066 nsSVGValue::NotifyObservers(SVGObserverNotifyFunction f,
00067                             modificationType aModType)
00068 {
00069   PRInt32 count = mObservers.Count();
00070   for (PRInt32 i = 0; i < count; ++i) {
00071     nsIWeakReference* wr = NS_STATIC_CAST(nsIWeakReference*,mObservers.ElementAt(i));
00072     nsCOMPtr<nsISVGValueObserver> observer = do_QueryReferent(wr);
00073     if (observer)
00074        (NS_STATIC_CAST(nsISVGValueObserver*,observer)->*f)(this, aModType);
00075   }
00076 }
00077 
00078 void
00079 nsSVGValue::WillModify(modificationType aModType)
00080 {
00081   if (++mModifyNestCount == 1)
00082     NotifyObservers(&nsISVGValueObserver::WillModifySVGObservable, aModType);
00083 }
00084 
00085 void
00086 nsSVGValue::DidModify(modificationType aModType)
00087 {
00088   NS_ASSERTION(mModifyNestCount>0, "unbalanced Will/DidModify calls");
00089   if (--mModifyNestCount == 0) {
00090     OnDidModify();
00091     NotifyObservers(&nsISVGValueObserver::DidModifySVGObservable, aModType);
00092   }
00093 }
00094 
00095 
00096 NS_IMETHODIMP
00097 nsSVGValue::AddObserver(nsISVGValueObserver* observer)
00098 {
00099   nsIWeakReference* wr = NS_GetWeakReference(observer);
00100   if (!wr) return NS_ERROR_FAILURE;
00101   mObservers.AppendElement((void*)wr);
00102   return NS_OK;
00103 }
00104 
00105 NS_IMETHODIMP
00106 nsSVGValue::RemoveObserver(nsISVGValueObserver* observer)
00107 {
00108   nsCOMPtr<nsIWeakReference> wr = do_GetWeakReference(observer);
00109   if (!wr) return NS_ERROR_FAILURE;
00110   PRInt32 i = mObservers.IndexOf((void*)wr);
00111   if (i<0) return NS_ERROR_FAILURE;
00112   nsIWeakReference* wr2 = NS_STATIC_CAST(nsIWeakReference*,mObservers.ElementAt(i));
00113   NS_RELEASE(wr2);
00114   mObservers.RemoveElementAt(i);
00115   return NS_OK;
00116 }
00117 
00118 NS_IMETHODIMP
00119 nsSVGValue::BeginBatchUpdate()
00120 {
00121   WillModify();
00122   return NS_OK;
00123 }
00124 
00125 NS_IMETHODIMP
00126 nsSVGValue::EndBatchUpdate()
00127 {
00128   DidModify();
00129   return NS_OK;
00130 }
00131 
00132