1 ! Copyright (C) 2005, 2008 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors arrays ui.gadgets ui.gadgets.viewports
4 ui.gadgets.frames ui.gadgets.grids ui.gadgets.theme
5 ui.gadgets.sliders ui.gestures kernel math namespaces sequences
6 models models.range models.compose combinators math.vectors
7 classes.tuple math.geometry.rect combinators.short-circuit ;
8 IN: ui.gadgets.scrollers
10 TUPLE: scroller < frame viewport x y follows ;
12 : find-scroller ( gadget -- scroller/f )
13 [ scroller? ] find-parent ;
15 : scroll-up-page ( scroller -- ) y>> -1 swap slide-by-page ;
17 : scroll-down-page ( scroller -- ) y>> 1 swap slide-by-page ;
19 : scroll-up-line ( scroller -- ) y>> -1 swap slide-by-line ;
21 : scroll-down-line ( scroller -- ) y>> 1 swap slide-by-line ;
23 : do-mouse-scroll ( scroller -- )
24 scroll-direction get-global
25 [ first swap x>> slide-by-line ]
26 [ second swap y>> slide-by-line ]
30 { T{ mouse-scroll } [ do-mouse-scroll ] }
33 : <scroller-model> ( -- model )
34 0 0 0 0 <range> 0 0 0 0 <range> 2array <compose> ;
36 : new-scroller ( gadget class -- scroller )
39 <scroller-model> >>model
42 dup model>> dependencies>> first <x-slider> >>x dup x>> @bottom grid-add
43 dup model>> dependencies>> second <y-slider> >>y dup y>> @right grid-add
45 tuck model>> <viewport> >>viewport
46 dup viewport>> @center grid-add ; inline
48 : <scroller> ( gadget -- scroller ) scroller new-scroller ;
50 : scroll ( value scroller -- )
52 viewport>> [ rect-dim { 0 0 } ] [ viewport-dim ] bi
55 2dup control-value = [ 2drop ] [ set-control-value ] if ;
57 : rect-min ( rect dim -- rect' )
58 [ [ loc>> ] [ dim>> ] bi ] dip vmin <rect> ;
60 : (scroll>rect) ( rect scroller -- )
61 [ [ loc>> { 1 1 } v- ] [ dim>> { 1 1 } v+ ] bi <rect> ] dip
63 [ scroller-value vneg offset-rect viewport-gap offset-rect ]
64 [ viewport>> dim>> rect-min ]
65 [ viewport>> 2rect-extent [ v- { 0 0 } vmin ] [ v- { 0 0 } vmax ] 2bi* v+ ]
70 : relative-scroll-rect ( rect gadget scroller -- newrect )
71 viewport>> gadget-child relative-loc offset-rect ;
73 : find-scroller* ( gadget -- scroller/f )
75 { [ nip ] [ viewport>> gadget-child swap child? ] [ nip ] }
78 : scroll>rect ( rect gadget -- )
79 dup find-scroller* dup [
80 [ relative-scroll-rect ] keep
85 : (update-scroller) ( scroller -- )
86 [ scroller-value ] keep scroll ;
88 : (scroll>gadget) ( gadget scroller -- )
90 [ [ pref-dim { 0 0 } swap <rect> ] keep ] dip
91 [ relative-scroll-rect ] keep
93 ] [ f >>follows (update-scroller) drop ] if ;
95 : scroll>gadget ( gadget -- )
96 dup find-scroller* dup [
103 : (scroll>bottom) ( scroller -- )
104 [ viewport>> viewport-dim { 0 1 } v* ] keep scroll ;
106 : scroll>bottom ( gadget -- )
107 find-scroller [ t >>follows relayout-1 ] when* ;
109 : scroll>top ( gadget -- )
110 <zero-rect> swap scroll>rect ;
112 GENERIC: update-scroller ( scroller follows -- )
114 M: t update-scroller drop (scroll>bottom) ;
116 M: gadget update-scroller swap (scroll>gadget) ;
118 M: rect update-scroller swap (scroll>rect) ;
120 M: f update-scroller drop (update-scroller) ;
123 [ call-next-method ] [
125 [ update-scroller ] [ >>follows drop ] 2bi
128 M: scroller focusable-child*
131 M: scroller model-changed
134 TUPLE: limited-scroller < scroller
135 { min-dim initial: { 0 0 } }
136 { max-dim initial: { 1/0. 1/0. } } ;
138 : <limited-scroller> ( gadget -- scroller )
139 limited-scroller new-scroller ;
141 M: limited-scroller pref-dim*
142 [ call-next-method ] [ min-dim>> vmax ] [ max-dim>> vmin ] tri ;