[Urwid] Edit widgets with multiple attributes

Ian Ward ian at excess.org
Mon Jun 4 09:48:36 EDT 2007

James Reeves wrote:
> Hi there,
> I'm having a little difficulty understanding how urwid renders palette 
> attributes to a canvas. I'd like to subclass the Edit widget and have it 
> apply different attributes to areas of text that match certain regular 
> expressions - in other words, a syntax-highlighting feature.
> Is it currently possible to do this in urwid, and if so, does anyone 
> have any suggestions about how might be the best way to go about it?

You can either override the get_text() method to figure out which 
attributes are needed on the fly, or you can modify the attrib array in 
the Edit object after each call to set_edit_text().

Attribute arrays look like this:
 >>> urwid.Text(["hello", ('big', " there")]).attrib
[(None, 5), ('big', 6)]

ie. they are (attribute, number of character) tuples in a list.



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