Hi Tim,
On 27.01.2012, at 13:42, Tim Docker wrote:
> Hi,
>
> I am attempting to use widgetModifyBase to change the background of a
> text entry, and then restore it again later. It's not clear to me how
> the restore should be done. It looks like the function should be
> taking
> (Maybe Color), and indeed the comment suggests this - see below.
>
> According to the gtk c library documentation, a null pointer for color
> should be passed in to undo previous calls.
>
> Am I missing something, or is this an oversight in the implementation?
>
Yes, this is an oversight. The right thing would be to add
widgetRestoreBase, widgetRestoreText, widgetRestoreFg, widgetRestorBg
in order not to break the existing API. In case you feel like
implementing them (with docs, please) then we'll gladly apply a patch.
Cheers,
Axel
> Thanks,
>
> Tim
>
>
> widgetModifyBase :: WidgetClass self => self
> -> StateType -- ^ @state@ - the state for which to set the base
> color.
> -> Color -- ^ @color@ - the color to assign (does not need to be
> -- allocated), or @Nothing@ to undo the effect of
> previous calls
> -- to of 'widgetModifyBase'.
> -> IO ()
> widgetModifyBase self state color =
> with color $ \colorPtr ->
> {# call gtk_widget_modify_base #}
> (toWidget self)
> ((fromIntegral . fromEnum) state)
> (castPtr colorPtr)
>
>
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