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nsSVGCoordCtxProvider.h
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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
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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 #ifndef __NS_SVGCOORDCTXPROVIDER_H__
00040 #define __NS_SVGCOORDCTXPROVIDER_H__
00041 
00042 #include "nsCOMPtr.h"
00043 #include "nsAutoPtr.h"
00044 #include "nsSVGCoordCtx.h"
00045 #include "nsIDOMSVGRect.h"
00046 #include "nsISVGValueObserver.h"
00047 #include "nsWeakReference.h"
00048 
00050 // nsSVGCoordCtxHolder: This is a private inner helper class for
00051 // nsSVGCoordCtxProvider. It holds the actual coordinate contexts; the
00052 // accessors (GetContextX,etc.) on nsSVGCoordCtxProvider are delegated
00053 // to it. The sole purpose for having this separate inner class is to
00054 // hide the nsISVGValueObserver interface which we require to listen
00055 // in on viewbox (mCtxRect) size changes.
00056 
00057 class nsSVGCoordCtxHolder : nsISVGValueObserver,
00058                             nsSupportsWeakReference
00059 {
00060 private:
00061   friend class nsSVGCoordCtxProvider;
00062   nsSVGCoordCtxHolder(); // addrefs
00063   ~nsSVGCoordCtxHolder();
00064   
00065   // nsISupports interface:
00066   NS_DECL_ISUPPORTS
00067   
00068   // nsISVGValueObserver interface:
00069   NS_IMETHOD WillModifySVGObservable(nsISVGValue* observable,
00070                                      nsISVGValue::modificationType aModType);
00071   NS_IMETHOD DidModifySVGObservable (nsISVGValue* observable,
00072                                      nsISVGValue::modificationType aModType);
00073 
00074   void SetContextRect(nsIDOMSVGRect* ctxRect);
00075   void SetMMPerPx(float mmPerPxX, float mmPerPxY);
00076 
00077   void Update();
00078   
00079   already_AddRefed<nsSVGCoordCtx> GetContextX();
00080   already_AddRefed<nsSVGCoordCtx> GetContextY();
00081   already_AddRefed<nsSVGCoordCtx> GetContextUnspecified();
00082   
00083   nsCOMPtr<nsIDOMSVGRect> mCtxRect;
00084   nsRefPtr<nsSVGCoordCtx> mCtxX;
00085   nsRefPtr<nsSVGCoordCtx> mCtxY;
00086   nsRefPtr<nsSVGCoordCtx> mCtxUnspec;
00087 };
00088 
00090 // pseudo interface nsSVGCoordCtxProvider
00091 
00092 // {0C083184-4462-4B5D-B925-0BEC5A7E6779}
00093 #define NS_SVGCOORDCTXPROVIDER_IID \
00094 { 0x0c083184, 0x4462, 0x4b5d, { 0xb9, 0x25, 0x0b, 0xec, 0x5a, 0x7e, 0x67, 0x79 } }
00095 
00096 class nsSVGCoordCtxProvider : public nsISupports
00097 {
00098 public:
00099   NS_DEFINE_STATIC_IID_ACCESSOR(NS_SVGCOORDCTXPROVIDER_IID)
00100 
00101   nsSVGCoordCtxProvider() : mInner(new nsSVGCoordCtxHolder) {}
00102     
00103   already_AddRefed<nsSVGCoordCtx> GetContextX() { return mInner ? mInner->GetContextX() : nsnull; }
00104   already_AddRefed<nsSVGCoordCtx> GetContextY() { return mInner ? mInner->GetContextY() : nsnull; }
00105   already_AddRefed<nsSVGCoordCtx> GetContextUnspecified() { return mInner ? mInner->GetContextUnspecified() : nsnull; }
00106 
00107 protected:
00108   void SetCoordCtxRect(nsIDOMSVGRect* ctxRect) { if(mInner) mInner->SetContextRect(ctxRect); }
00109   void SetCoordCtxMMPerPx(float mmPerPxX, float mmPerPxY) {
00110     if(mInner)
00111       mInner->SetMMPerPx(mmPerPxX, mmPerPxY);
00112   }
00113   
00114 private:
00115   nsRefPtr<nsSVGCoordCtxHolder> mInner;
00116 };
00117 
00118 #endif // __NS_SVGCOORDCTXPROVIDER_H__