Re: Stock item "GO_BACK"

[Kjell Ahlstedt <kjell ahlstedt bredband net>]

2013-12-04 16:28, John Emmas skrev:
> I'm building a gtkmm dialog which uses the following line of code to 
> add a button (where 'back_button' is of type Gtk::Button*):-
>
>         back_button = add_button (Stock::GO_BACK, RESPONSE_NO);
>
> When the specified button is 'Stock::GO_BACK' the program repeatedly 
> crashes at run time.  I've tried around 20 other values (Stock::OPEN / 
> Stock::CANCEL / Stock::QUIT etc) and all of them worked successfully.  
> It's just that one value which crashes.  The only discrepancy I can 
> see is this (in gtkmm/stock.h):-
>
>     extern GTKMM_API const Gtk::BuiltinStockID GO_BACK; /*!< 
> left-to-right languages: @image html gtk-go-back-ltr.png */
>
> compared to this, in gtkstock.h (libgtk):-
>
>     /**
>      * GTK_STOCK_GO_BACK:
>      *
>      * The "Back" item.
>      * <inlinegraphic fileref="go-previous-ltr.png" 
> format="PNG"></inlinegraphic>
>      * RTL variant
>      * <inlinegraphic fileref="go-previous-rtl.png" 
> format="PNG"></inlinegraphic>
>      */
>     #define GTK_STOCK_GO_BACK  "gtk-go-back"
>
> Notice from the comments that gtkmm seems to think the graphic image 
> should be called "gtk-go-back-ltr.png" whereas gtkmm thinks it's 
> called "go-previous-ltr.png".  I don't know if I happened to pick 20 
> good examples but in all the other cases, gtkmm and gtk+ seemed to 
> agree about the name.  Could this disagreement be causing my crash? 
> And if so, which name is the right one?
>
> John
No, this disagreement can't cause your crash. It's in a comment. It 
probably affects the reference documentation. Probably no icon is shown 
in the documentation. GO_FORWARD has a similar disagreement.

Gtk::Stock::GO_BACK is initialized like so:
  const Gtk::BuiltinStockID GO_BACK = { GTK_STOCK_GO_BACK };

The icon files are probably called go-previous-ltr.png and 
go-previous-rtl.png. I found the following line in gtkiconfactory.c, but 
I don't know exactly what it means:
  register_bidi_stock_icon (factory, GTK_STOCK_GO_BACK, "go-previous");