[Shapefusion-devel] Fwd: Doc/View framework, and stopping LoadObject

[tiennou <tie...@gm...>]

Here is the response I got from wx-users... Guess we'll have to cope  
with this by making our own wxDoc subclass... I'll look into this.

Début du message réexpédié :

> De : Klaas Holwerda <db...@nl...>
> Date : 16 mars 2007 10:27:49 HNEC
> À : wx-...@li...
> Objet : Rép : Doc/View framework, and stopping LoadObject
> Répondre à : wx-...@li...
>
> tiennou wrote:
>
>> I guess I should return something wrong somewhere in LoadObject,  
>> but I can't return NULL (compiler give me an error), so what is  
>> the correct way of telling the Document that I should use ?
>
> In wxArt2D derived doec/view framework i handled this problem by  
> having m_parsedWell flag in a2dDocument.
> And i have several ways to find a handler for the document to load.
> A handler is coupled to a document template.
> Like in void a2dDocument::OnOpenDocument( a2dDocumentEvent& event )  
> find a handler based on the document template.
>
>     a2dIOHandlerStrIn* handler = m_documentTemplate- 
> >GetDocumentIOHandlerForLoad( store, this );
>
>     LoadObject( store, handler );
>     if ( !m_parsedWell || (!store && !store.eof()) )
>     {
>         a2dDocviewGlobals->ReportErrorF( a2dError_FileCouldNotOpen,  
> _("Sorry, could not Load file %s"), file.GetFullPath().c_str() );
>         event.Veto();
>     }
>
> Here GetDocumentIOHandlerForLoad normaly only returns the handler  
> of the document template.
> But it also does test with the handler its CanLoad() method if at  
> least the file header is oke.
> This makes it possible to load files without extensions too.
> And the one down here searches a handler in all available templates.
>
> a2dIOHandlerStrIn*  
> a2dDocumentTemplateAuto::GetDocumentIOHandlerForLoad 
> ( a2dDocumentInputStream& stream, a2dDocument* document )
> {
>     // Find the template for this type of document.
>     const a2dDocumentTemplateList& allDocTemplates =  
> a2dDocviewGlobals->GetDocviewCommandProcessor()->GetDocTemplates();
> 	for( a2dDocumentTemplateList::const_iterator iter =  
> allDocTemplates.begin(); iter != allDocTemplates.end(); ++iter )
> 	{
> 	    a2dDocumentTemplateList::value_type temp = *iter;
>         if ( temp != this && temp->GetDocumentTypeName() ==  
> GetDocumentTypeName() && temp->GetDocumentIOHandlerStrIn() && temp- 
> >GetDocumentIOHandlerStrIn()->CanLoad( stream, document ) )
>              return temp->GetDocumentIOHandlerStrIn();
>     }
>     return NULL;
> }
>
> To bad for you, you can not do these things with the standard Doc/ 
> view framework. I found several other short comings, which made  
> certain things impossible.
> So i think you best can take mine, our you modify the existing one  
> to suit your needs.
>
> Klaas
>
>
>
>
>
> -- 
> Unclassified
>
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tiennou