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lightning-sunbird  0.9+nobinonly
nsSVGCoordCtxProvider.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) 2002
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *   Alex Fritze <alex@croczilla.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 "nsSVGCoordCtxProvider.h"
00040 #include "nsISVGValue.h"
00041 #include "nsISVGValueUtils.h"
00042 #include <math.h>
00043 
00045 // nsSVGCoordCtxHolder implementation
00046 
00047 nsSVGCoordCtxHolder::nsSVGCoordCtxHolder()
00048     : mCtxX(dont_AddRef(new nsSVGCoordCtx)),
00049       mCtxY(dont_AddRef(new nsSVGCoordCtx)),
00050       mCtxUnspec(dont_AddRef(new nsSVGCoordCtx))
00051 {}
00052 
00053 nsSVGCoordCtxHolder::~nsSVGCoordCtxHolder()
00054 {
00055   if (mCtxRect)
00056     NS_REMOVE_SVGVALUE_OBSERVER(mCtxRect);  
00057 }
00058 
00059 //----------------------------------------------------------------------
00060 // nsISupports methods:
00061 
00062 NS_IMPL_ADDREF(nsSVGCoordCtxHolder)
00063 NS_IMPL_RELEASE(nsSVGCoordCtxHolder)
00064 
00065 NS_INTERFACE_MAP_BEGIN(nsSVGCoordCtxHolder)
00066   NS_INTERFACE_MAP_ENTRY(nsISVGValueObserver)
00067   NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
00068   NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsISVGValueObserver)
00069 NS_INTERFACE_MAP_END
00070 
00071 //----------------------------------------------------------------------
00072 // nsISVGValueObserver methods:
00073 
00074 NS_IMETHODIMP
00075 nsSVGCoordCtxHolder::WillModifySVGObservable(nsISVGValue* observable,
00076                                              nsISVGValue::modificationType aModType)
00077 {
00078   return NS_OK;
00079 }
00080 
00081 NS_IMETHODIMP
00082 nsSVGCoordCtxHolder::DidModifySVGObservable(nsISVGValue* observable,
00083                                             nsISVGValue::modificationType aModType)
00084 {
00085   Update();
00086   return NS_OK;
00087 }
00088 
00089 //----------------------------------------------------------------------
00090 
00091 void
00092 nsSVGCoordCtxHolder::SetContextRect(nsIDOMSVGRect* ctxRect)
00093 {
00094   if (mCtxRect)
00095     NS_REMOVE_SVGVALUE_OBSERVER(mCtxRect);
00096   mCtxRect = ctxRect;
00097   if (mCtxRect) {
00098     NS_ADD_SVGVALUE_OBSERVER(mCtxRect);
00099     Update();
00100   }
00101 }
00102 
00103 void
00104 nsSVGCoordCtxHolder::SetMMPerPx(float mmPerPxX, float mmPerPxY)
00105 {
00106   mCtxX->mmPerPx = mmPerPxX;
00107   mCtxY->mmPerPx = mmPerPxY;
00108   mCtxUnspec->mmPerPx = (float)sqrt((mmPerPxX*mmPerPxX + mmPerPxY*mmPerPxY)/2.0);
00109 }
00110 
00111 void
00112 nsSVGCoordCtxHolder::Update()
00113 {
00114   float w,h;
00115   mCtxRect->GetWidth(&w);
00116   mCtxRect->GetHeight(&h);
00117   mCtxX->mLength->SetValue(w);
00118   mCtxY->mLength->SetValue(h);
00119   mCtxUnspec->mLength->SetValue((float)sqrt((w*w+h*h)/2.0));
00120 }
00121 
00122 already_AddRefed<nsSVGCoordCtx>
00123 nsSVGCoordCtxHolder::GetContextX()
00124 {
00125   nsSVGCoordCtx *rv = mCtxX.get();
00126   NS_IF_ADDREF(rv);
00127   return rv;
00128 }
00129 
00130 already_AddRefed<nsSVGCoordCtx>
00131 nsSVGCoordCtxHolder::GetContextY()
00132 {
00133   nsSVGCoordCtx *rv = mCtxY.get();
00134   NS_IF_ADDREF(rv);
00135   return rv;
00136 }
00137 
00138 already_AddRefed<nsSVGCoordCtx>
00139 nsSVGCoordCtxHolder::GetContextUnspecified()
00140 {
00141   nsSVGCoordCtx *rv = mCtxUnspec.get();
00142   NS_IF_ADDREF(rv);
00143   return rv;
00144 }