MuteBackingStoreSubject.h

//========================================================================================
// 
// $File$
// 
// Owner: Matt Joss
// 
// $Author$
// 
// $DateTime$
// 
// $Revision$
// 
// $Change$
// 
// Copyright 1997-2010 Adobe Systems Incorporated. All rights reserved.
// 
// NOTICE: Adobe permits you to use, modify, and distribute this file in accordance 
// with the terms of the Adobe license agreement accompanying it. If you have received
// this file from a source other than Adobe, then your use, modification, or 
// distribution of it requires the prior written permission of Adobe.
// 
// 
// Purpose:
// Helper class for muting the ISubject of the backing store. For many commands,
// we don't want to broadcast their subcommands. Clients should just be able to listen for 
// The higher level commands
// 
//========================================================================================

#include "VCPlugInHeaders.h"

#include "IDataBase.h"
#include "IDocument.h"
#include "IXMLUtils.h"
#include "IIDXMLElement.h"
#include "ISubject.h"

class MuteBackingStoreSubject
{
 public:
 MuteBackingStoreSubject(IDataBase* db) : fSubject(nil), fWasMuted(kFalse)
 { 
 // -- We have to hang on to the subject here because it is not persistant. With the instance cache
 // -- turned off the state of mute gets lost as soon as ISubject goes out of scope. Then the next
 // -- time it is instantiated it gets un-muted. Hanging on to the subject will ensure that the
 // -- mute state will persist as long as this class is in scope. [LDM]
 /* fSubject = (ISubject*)Utils<IXMLUtils>()->GetBackingStore(db).Instantiate(IID_ISUBJECT);
 if (fSubject)
 {
 fWasMuted = fSubject->IsMuted();
 fSubject->Mute(kTrue);
 }*/
 }
 
 ~MuteBackingStoreSubject()
 {
 /* if (fSubject)
 {
 if (!fWasMuted)
 fSubject->Mute(kFalse);
 
 fSubject->Release();
 fSubject = nil;
 }*/
 }

 
 private:
 MuteBackingStoreSubject() {}
 
 ISubject* fSubject;
 bool16 fWasMuted;
};