1 ! Copyright (C) 2009 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: sequences kernel accessors math math.vectors
4 math.rectangles math.order arrays locals fry
5 combinators.short-circuit ;
6 IN: math.rectangles.positioning
8 ! Some geometry code for positioning popups and menus
9 ! in a semi-intelligent manner
13 : adjust-visible-rect ( visible-rect popup-dim screen-dim -- visible-rect' )
14 [ drop clone ] dip '[ _ vmin ] change-loc ;
16 : popup-x ( visible-rect popup-dim screen-dim -- x )
17 [ loc>> first ] 2dip swap [ first ] bi@ - min 0 max ;
19 : preferred-y ( visible-rect -- y )
20 [ loc>> ] [ dim>> ] bi [ second ] bi@ + ;
22 : alternate-y ( visible-rect popup-dim -- y )
23 [ loc>> ] dip [ second ] bi@ - ;
25 : preferred-fit? ( visible-rect popup-dim screen-dim -- ? )
26 [ [ preferred-y ] [ second ] bi* + ] dip second < ;
28 : alternate-fit? ( visible-rect popup-dim -- ? )
31 : popup-y ( visible-rect popup-dim screen-dim -- y )
32 3dup { [ preferred-fit? not ] [ drop alternate-fit? ] } 3&&
33 [ drop alternate-y ] [ 2drop preferred-y ] if ;
35 : popup-loc ( visible-rect popup-dim screen-dim -- loc )
36 [ popup-x ] [ popup-y ] 3bi 2array ;
38 :: popup-dim ( loc popup-dim screen-dim -- dim )
39 screen-dim loc v- popup-dim vmin ;
43 : popup-rect ( visible-rect popup-dim screen-dim -- rect )
44 [ adjust-visible-rect ] 2keep
45 [ popup-loc dup ] 2keep popup-dim <rect> ;