1 ! Copyright (C) 2009 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: kernel accessors sequences locals ;
4 IN: ui.tools.browser.history
6 TUPLE: history owner back forward ;
8 : <history> ( owner -- history )
9 V{ } clone V{ } clone history boa ;
11 GENERIC: history-value ( object -- value )
13 GENERIC: set-history-value ( value object -- )
15 : (add-history) ( history to -- )
16 swap owner>> history-value dup [ swap push ] [ 2drop ] if ;
18 :: go-back/forward ( history to from -- )
20 history to (add-history)
21 from pop history owner>> set-history-value
24 : go-back ( history -- )
25 dup [ forward>> ] [ back>> ] bi go-back/forward ;
27 : go-forward ( history -- )
28 dup [ back>> ] [ forward>> ] bi go-back/forward ;
30 : add-history ( history -- )
31 dup forward>> delete-all
32 dup back>> (add-history) ;