1 ! Copyright (C) 2006, 2008 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors continuations kernel math math.order sequences ;
6 TUPLE: model < identity-tuple
7 value connections dependencies ref locked? ;
9 : new-model ( value class -- model )
12 V{ } clone >>connections
13 V{ } clone >>dependencies
16 : <model> ( value -- model )
19 : add-dependency ( dep model -- )
22 : remove-dependency ( dep model -- )
23 dependencies>> remove! drop ;
27 GENERIC: model-activated ( model -- )
29 M: model model-activated drop ;
31 : ref-model ( model -- n )
32 [ 1 + dup ] change-ref drop ;
34 : unref-model ( model -- n )
35 [ 1 - dup ] change-ref drop ;
37 : activate-model ( model -- )
40 [ dup activate-model dupd add-connection ] each
46 DEFER: remove-connection
48 : deactivate-model ( model -- )
49 dup unref-model zero? [
51 [ dup deactivate-model remove-connection ] with each
56 : compute-model ( model -- value )
57 [ activate-model ] [ deactivate-model ] [ value>> ] tri ;
59 GENERIC: model-changed ( model observer -- )
61 : add-connection ( observer model -- )
63 [ empty? [ activate-model ] [ drop ] if ]
66 : remove-connection ( observer model -- )
67 [ connections>> remove! ] keep swap
68 empty? [ deactivate-model ] [ drop ] if ;
70 : with-locked-model ( model quot -- )
71 [ '[ _ t >>locked? @ ] ]
72 [ drop '[ f _ locked?<< ] ]
75 GENERIC: update-model ( model -- )
77 M: model update-model drop ;
79 : notify-connections ( model -- )
80 dup connections>> [ model-changed ] with each ;
82 : set-model ( value model -- )
88 [ update-model ] [ notify-connections ] bi
92 : ?set-model ( value model -- )
93 2dup value>> = [ 2drop ] [ set-model ] if ;
95 : call-change-model ( model quot -- newvalue model )
96 over [ [ value>> ] dip call ] dip ; inline
98 : change-model ( ..a model quot: ( ..a obj -- ..b newobj ) -- ..b )
99 call-change-model set-model ; inline
101 : (change-model) ( ..a model quot: ( ..a obj -- ..b newobj ) -- ..b )
102 call-change-model value<< ; inline
104 GENERIC: range-value ( model -- value )
105 GENERIC: range-page-value ( model -- value )
106 GENERIC: range-min-value ( model -- value )
107 GENERIC: range-max-value ( model -- value )
108 GENERIC: range-max-value* ( model -- value )
109 GENERIC: set-range-value ( value model -- )
110 GENERIC: set-range-page-value ( value model -- )
111 GENERIC: set-range-min-value ( value model -- )
112 GENERIC: set-range-max-value ( value model -- )
114 : clamp-value ( value range -- newvalue )
115 [ range-min-value ] [ range-max-value* ] bi clamp ;
117 : change-model* ( ..a model quot: ( ..a obj -- ..b ) -- ..b )
118 '[ _ keep ] change-model ; inline
120 : push-model ( value model -- )
121 [ push ] change-model* ;
123 : pop-model ( model -- value )
124 [ pop ] change-model* ;