Re: States in GailLabel

[Bill Haneman <bill haneman sun com>]

Brian Cameron wrote:
> 
> GtkLabel's support single-line and multi-line labels.  There is no
> direct gtk_label_function to tell if a label is single-line or
> multi-line, but you can tell with a little bit of digging through
> the GtkLabel's pango structures.
> 
> Here is the definitions of ATK_STATE_MULTI_LINE and
> ATK_STATE_SINGLE_LINE:
> 
>   ATK_STATE_MULTI_LINE:
>     Indicates this (text) object can contain multiple lines of text
>   ATK_STATE_SINGLE_LINE:
>     Indicates this (text) object can contain only a single line of text
> 
> Since labels are read-only, they do not typically change.  They can
> change programmatically, and they could change between a single-line
> label and a multi-line label, though this is probably not very common.
> 
> Currently GailLabel just blindly says it is ATK_STATE_MULTI_LINE since
> GtkLabel "can contain multiple lines of text".
> 
> However, should it be more dynamic and actually check to see if it
> is single-line or multi-line, and set its value appropriately.
> If this is so, then it will need to possibly update its state value
> each time it generates a "text-changed" signal.
> 
> Is there a use-case where knowing if a label has state SINGLE_LINE
> or MULTI_LINE is actually useful?

I would expect that a 'get_text' on a multiline label would (unlike
some situations) might contain newline characters from which one could
determine this trivially.  If labels do auto-wordwrap then this might
not be the case, but if multiline labels require explicit newlines on
creation then this simple method might suffice.

> Brian
> 
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-- 
--------------
Bill Haneman
Gnome Accessibility / Batik SVG Toolkit
Sun Microsystems Ireland