RE: Displaying simple HTML in gtkmm app (got it!)

["Erik Ohrnberger" <erik echohome org>]

Chris,
    I've since found out that embedded mozilla is a far easier solution to
displaying HTML content, images, etc., than the gtkhtml library (Thanks
Murray).

    So this issue is moot at present.

    Thanks for your response anyway.

    Erik.

> -----Original Message-----
> From: gtkmm-list-bounces gnome org 
> [mailto:gtkmm-list-bounces gnome org] On Behalf Of Chris Vine
> Sent: Saturday, April 23, 2005 8:38 PM
> To: gtkmm-list gnome org
> Cc: erik_ohrnberger dme net
> Subject: Re: Displaying simple HTML in gtkmm app (got it!)
> 
> 
> On Thursday 21 April 2005 19:06, erik_ohrnberger dme net wrote:
> 
> [snip]
> 
> >  The other thing that I noticed about this way of 
> implementing this is 
> > that you are limited to a single instance of a window that 
> can render 
> > HTML.  I was starting to create a C++ wrapper class, but found out 
> > that the
> > lines:
> >
> >  g_signal_connect( G_OBJECT( document ), "request_url", G_CALLBACK( 
> > &gtkhtml::url_requested ), NULL );  g_signal_connect( G_OBJECT( 
> > document ), "link_clicked", G_CALLBACK( &gtkhtml::link_clicked ),  
> > NULL );
> >
> >  are proving to be difficult to resolve.  How would you 
> connect gtk+ 
> > signals to a C++ class instance?  That appears to be the 
> question now, 
> > for me at least.
> 
> I am not sure I have understood the question but if relates 
> to making the 
> callback aware of the class instance invoking the callback 
> (say the one in 
> whose constructor the call to g_signal_connect() was made) 
> then pass the 
> address of that instance (the this pointer) as the data 
> argument, which is 
> the last argument and is of type void*, thus:
> 
>   g_signal_connect( G_OBJECT( document ), "request_url",
>                     G_CALLBACK(&gtkhtml::url_requested ), this );
> 
> then gtkhtml::url_requested() would use static_cast<>() to 
> cast its last 
> argument back to a pointer of the relevant type.
> 
> gtkhtml::url_requested() should have extern "C" linkage (and 
> made a friend if 
> it needs to have access to the class internals), but it looks 
> as if it is a 
> static class member function, which cannot have "C" linkage.  
> Using a static 
> member function will work with some compilers (eg g++) but 
> not with others - 
> it is implementation dependent.
> 
> Chris.
> 
> -- 
> Summer is y-cumen in, lhude sing, cuccu!
> Groweth sed and bloweth med, springeth the wude nu. 
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