factor/library/ui/labels.factor

! Copyright (C) 2005 Slava Pestov.
! See http://factor.sf.net/license.txt for BSD license.
IN: gadgets-labels
USING: arrays gadgets gadgets-layouts generic hashtables io
kernel math namespaces sequences styles ;

! A label gadget draws a string.
TUPLE: label text ;

C: label ( text -- label )
    dup delegate>gadget [ set-label-text ] keep ;

: label-size ( gadget text -- dim )
    >r gadget-font r> size-string 0 3array ;

: set-label-text* ( text label -- )
    2dup label-text =
    [ 2dup [ set-label-text ] keep relayout ] unless 2drop ;

M: label pref-dim ( label -- dim )
    dup label-text label-size ;

M: label draw-gadget* ( label -- )
    dup delegate draw-gadget* drop ; ! label-text draw-string ;

M: label set-message ( string/f label -- )
    >r [ "" ] unless* r> set-label-text* ;