author | fm |
Mon, 23 Apr 2007 11:32:45 +0200 | |
changeset 2323 | c038faba10bf |
parent 1815 | 5f6fb98a3479 |
child 2530 | a40d597a31ed |
permissions | -rw-r--r-- |
145 | 1 |
" |
2 |
COPYRIGHT (c) 1995 by Claus Gittinger |
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158 | 3 |
All Rights Reserved |
145 | 4 |
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5 |
This software is furnished under a license and may be used |
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only in accordance with the terms of that license and with the |
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inclusion of the above copyright notice. This software may not |
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be provided or otherwise made available to, or used by, any |
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other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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||
13 |
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1665 | 14 |
"{ Package: 'stx:libview2' }" |
15 |
||
145 | 16 |
ValueModel subclass:#BlockValue |
17 |
instanceVariableNames:'cachedValue arguments block' |
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classVariableNames:'NeverComputed' |
145 | 19 |
poolDictionaries:'' |
20 |
category:'Interface-Support-Models' |
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21 |
! |
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22 |
||
23 |
!BlockValue class methodsFor:'documentation'! |
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24 |
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25 |
copyright |
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26 |
" |
|
27 |
COPYRIGHT (c) 1995 by Claus Gittinger |
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158 | 28 |
All Rights Reserved |
145 | 29 |
|
30 |
This software is furnished under a license and may be used |
|
31 |
only in accordance with the terms of that license and with the |
|
32 |
inclusion of the above copyright notice. This software may not |
|
33 |
be provided or otherwise made available to, or used by, any |
|
34 |
other person. No title to or ownership of the software is |
|
35 |
hereby transferred. |
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36 |
" |
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37 |
||
38 |
! |
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||
40 |
documentation |
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41 |
" |
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42 |
BlockValues depend on multiple other objects (typically valueHolders) |
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43 |
and recompute a value whenever one of them changes. |
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44 |
If the new value is different, it triggers itself a change to its dependents. |
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45 |
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46 |
Example use is to base an enableChannels value on multiple other boolean values. |
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47 |
(See example for how this is done) |
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223 | 48 |
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231 | 49 |
Notice: |
50 |
this class was implemented using protocol information |
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51 |
from alpha testers - it may not be complete or compatible to |
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52 |
the corresponding ST-80 class. |
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53 |
If you encounter any incompatibilities, please forward a note |
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describing the incompatibility verbal (i.e. no code) to the ST/X team. |
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||
223 | 56 |
[author:] |
57 |
Claus Gittinger |
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145 | 58 |
" |
59 |
||
60 |
! |
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61 |
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62 |
examples |
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63 |
" |
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155 | 64 |
checkToggle 3 shows the value of toggle1 AND toggle2 |
231 | 65 |
[exBegin] |
66 |
|val1 val2 both box| |
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155 | 67 |
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231 | 68 |
val1 := false asValue. |
69 |
val2 := false asValue. |
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70 |
both := BlockValue |
|
71 |
with:[:v1 :v2 | |
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268 | 72 |
Transcript showCR:'evaluating ...'. |
231 | 73 |
v1 value and:[v2 value] |
74 |
] |
|
75 |
arguments:(Array with:val1 with:val2). |
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155 | 76 |
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231 | 77 |
box := Dialog new. |
78 |
box addCheckBox:'one' on:val1. |
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79 |
box addCheckBox:'two' on:val2. |
|
80 |
box addHorizontalLine. |
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81 |
box addCheckBox:'both' on:both. |
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911 | 82 |
box addOkButton. |
231 | 83 |
box open |
84 |
[exEnd] |
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155 | 85 |
|
86 |
the same, using a convenient instance creation message: |
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231 | 87 |
[exBegin] |
88 |
|val1 val2 both box| |
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155 | 89 |
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231 | 90 |
val1 := false asValue. |
91 |
val2 := false asValue. |
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92 |
both := BlockValue forLogical:val1 and:val2. |
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145 | 93 |
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231 | 94 |
box := Dialog new. |
95 |
box addCheckBox:'one' on:val1. |
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96 |
box addCheckBox:'two' on:val2. |
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97 |
box addHorizontalLine. |
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911 | 98 |
(box addCheckBox:'both' on:both) disable. |
99 |
box addOkButton. |
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231 | 100 |
box open |
101 |
[exEnd] |
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155 | 102 |
|
103 |
logical or: |
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231 | 104 |
[exBegin] |
105 |
|val1 val2 both box| |
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155 | 106 |
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231 | 107 |
val1 := false asValue. |
108 |
val2 := false asValue. |
|
109 |
both := BlockValue forLogical:val1 or:val2. |
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145 | 110 |
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231 | 111 |
box := Dialog new. |
112 |
box addCheckBox:'one' on:val1. |
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113 |
box addCheckBox:'two' on:val2. |
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114 |
box addHorizontalLine. |
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115 |
box addCheckBox:'both' on:both. |
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911 | 116 |
box addOkButton. |
231 | 117 |
box open |
118 |
[exEnd] |
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155 | 119 |
|
120 |
example use: enabling an element depending on two others: |
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231 | 121 |
[exBegin] |
122 |
|val1 val2 enabler val3 box| |
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155 | 123 |
|
231 | 124 |
val1 := false asValue. |
125 |
val2 := false asValue. |
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126 |
val3 := false asValue. |
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127 |
enabler := BlockValue forLogical:val1 and:val2. |
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155 | 128 |
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231 | 129 |
box := Dialog new. |
130 |
box addCheckBox:'one' on:val1. |
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131 |
box addCheckBox:'two' on:val2. |
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132 |
box addHorizontalLine. |
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911 | 133 |
(box addCheckBox:'three (both of the above)' on:val3) enableChannel:enabler. |
134 |
box addOkButton. |
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231 | 135 |
box open |
136 |
[exEnd] |
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382 | 137 |
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138 |
||
139 |
like above, using a logical-or block: |
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140 |
[exBegin] |
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141 |
|val1 val2 enabler val3 box| |
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142 |
||
143 |
val1 := false asValue. |
|
144 |
val2 := false asValue. |
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145 |
val3 := false asValue. |
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146 |
enabler := BlockValue forLogical:val1 or:val2. |
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147 |
||
148 |
box := Dialog new. |
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149 |
box addCheckBox:'one' on:val1. |
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150 |
box addCheckBox:'two' on:val2. |
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151 |
box addHorizontalLine. |
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911 | 152 |
(box addCheckBox:'three (any of the above)' on:val3) enableChannel:enabler. |
153 |
box addOkButton. |
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382 | 154 |
box open |
155 |
[exEnd] |
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156 |
||
157 |
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158 |
like above, using a bunch of toggles: |
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159 |
[exBegin] |
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160 |
|values anyValue box| |
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161 |
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162 |
values := (1 to:10) collect:[:i | false asValue]. |
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163 |
anyValue := BlockValue forLogicalOrAll:values. |
|
164 |
anyValue onChangeSend:#value to:[Transcript showCR:'any is true']. |
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165 |
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166 |
box := Dialog new. |
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167 |
values keysAndValuesDo:[:index :aValueHolder | |
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168 |
box addCheckBox:index printString on:aValueHolder. |
|
169 |
]. |
|
170 |
box addHorizontalLine. |
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911 | 171 |
(box addOkButton) enableChannel:anyValue. |
382 | 172 |
box open |
173 |
[exEnd] |
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145 | 174 |
" |
175 |
! ! |
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176 |
||
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177 |
!BlockValue class methodsFor:'initialization'! |
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178 |
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179 |
initialize |
158 | 180 |
NeverComputed isNil ifTrue:[ |
181 |
NeverComputed := Object new. |
|
182 |
] |
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! ! |
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184 |
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145 | 185 |
!BlockValue class methodsFor:'instance creation'! |
186 |
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block:aBlock arguments:aCollectionOfArguments |
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"return a new BlockValue computing aBlock. |
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189 |
Same as #with:arguments: for ST80 compatibility" |
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190 |
|
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191 |
^ self with:aBlock arguments:aCollectionOfArguments |
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192 |
|
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193 |
"Created: / 20.6.1998 / 14:00:16 / cg" |
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194 |
! |
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added #block:arguments: for ST80 compatibility.
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195 |
|
155 | 196 |
forLogical:arg1 and:arg2 |
1326 | 197 |
"return a new BlockValue computing the logical AND of its args |
198 |
(which are usually other valueHolders)" |
|
155 | 199 |
|
1815 | 200 |
^ (self new) |
1326 | 201 |
setBlock:[:a :b | a value and:[b value]] |
202 |
arguments:(Array with:arg1 with:arg2) |
|
155 | 203 |
|
1326 | 204 |
"Created: / 16.12.1995 / 19:20:14 / cg" |
205 |
"Modified: / 30.1.2000 / 23:24:50 / cg" |
|
155 | 206 |
! |
207 |
||
208 |
forLogical:arg1 or:arg2 |
|
1326 | 209 |
"return a new BlockValue computing the logical OR of its args |
210 |
(which are usually other valueHolders)" |
|
155 | 211 |
|
1815 | 212 |
^ (self new) |
1326 | 213 |
setBlock:[:a :b | a value or:[b value]] |
214 |
arguments:(Array with:arg1 with:arg2) |
|
155 | 215 |
|
1326 | 216 |
"Created: / 16.12.1995 / 19:20:14 / cg" |
217 |
"Modified: / 30.1.2000 / 23:24:46 / cg" |
|
155 | 218 |
! |
219 |
||
382 | 220 |
forLogicalAndAll:argArray |
221 |
"return a new BlockValue computing the logical OR of all elements |
|
1326 | 222 |
in the passed argArray (which are usually other valueHolders)" |
382 | 223 |
|
1815 | 224 |
^ (self new) |
382 | 225 |
setBlock:[:a | (argArray findFirst:[:a | a value not]) == 0] |
911 | 226 |
argumentArray:argArray asArray |
382 | 227 |
|
911 | 228 |
"Created: / 22.1.1997 / 19:12:44 / cg" |
229 |
"Modified: / 28.4.1998 / 20:16:38 / ca" |
|
1326 | 230 |
"Modified: / 30.1.2000 / 23:24:40 / cg" |
382 | 231 |
! |
232 |
||
1045 | 233 |
forLogicalNot:arg |
1326 | 234 |
"return a new BlockValue computing the logical NOT of its arg |
235 |
(which is usually another valueHolder)" |
|
1045 | 236 |
|
1815 | 237 |
^ (self new) |
1045 | 238 |
setBlock:[:a | a value not] |
239 |
arguments:(Array with:arg) |
|
240 |
||
241 |
"Created: / 17.8.1998 / 10:06:41 / cg" |
|
1326 | 242 |
"Modified: / 30.1.2000 / 23:24:18 / cg" |
1045 | 243 |
! |
244 |
||
382 | 245 |
forLogicalOrAll:argArray |
246 |
"return a new BlockValue computing the logical OR of all elements |
|
1326 | 247 |
in the passed argArray (which are usually other valueHolders)" |
382 | 248 |
|
1815 | 249 |
^ (self new) |
606 | 250 |
setBlock:[:arg | (arg findFirst:[:el | el value]) ~~ 0] |
911 | 251 |
argumentArray:argArray asArray |
382 | 252 |
|
911 | 253 |
"Created: / 22.1.1997 / 19:13:01 / cg" |
254 |
"Modified: / 28.4.1998 / 20:20:09 / ca" |
|
1326 | 255 |
"Modified: / 30.1.2000 / 23:24:34 / cg" |
382 | 256 |
! |
257 |
||
145 | 258 |
with:aBlock |
259 |
"return a new BlockValue computing aBlock" |
|
260 |
||
1815 | 261 |
^ (self new) setBlock:aBlock |
145 | 262 |
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263 |
"Created: 16.12.1995 / 19:16:33 / cg" |
|
264 |
! |
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265 |
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266 |
with:aBlock argument:anArgument |
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267 |
"return a new BlockValue computing aBlock" |
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|
268 |
|
1815 | 269 |
^ (self new) |
1352 | 270 |
setBlock:aBlock |
271 |
arguments:(Array with:anArgument) |
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272 |
|
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273 |
"Created: 16.12.1995 / 19:20:14 / cg" |
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274 |
! |
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275 |
|
1255 | 276 |
with:aBlock argument:anArgument1 argument:anArgument2 |
277 |
"return a new BlockValue computing aBlock" |
|
278 |
||
1815 | 279 |
^ (self new) |
1352 | 280 |
setBlock:aBlock |
281 |
arguments:(Array with:anArgument1 with:anArgument2) |
|
1255 | 282 |
|
283 |
"Created: 16.12.1995 / 19:20:14 / cg" |
|
284 |
! |
|
285 |
||
1352 | 286 |
with:aBlock argument:anArgument1 argument:anArgument2 argument:anArgument3 |
287 |
"return a new BlockValue computing aBlock" |
|
288 |
||
1815 | 289 |
^ (self new) |
1352 | 290 |
setBlock:aBlock |
291 |
arguments:(Array with:anArgument1 with:anArgument2 with:anArgument3) |
|
1815 | 292 |
! |
1352 | 293 |
|
1815 | 294 |
with:aBlock argument:anArgument1 argument:anArgument2 argument:anArgument3 argument:anArgument4 |
295 |
"return a new BlockValue computing aBlock" |
|
296 |
||
297 |
^ (self new) |
|
298 |
setBlock:aBlock |
|
299 |
arguments:(Array with:anArgument1 with:anArgument2 with:anArgument3 with:anArgument4) |
|
1352 | 300 |
! |
301 |
||
145 | 302 |
with:aBlock arguments:aCollectionOfArguments |
303 |
"return a new BlockValue computing aBlock" |
|
304 |
||
1815 | 305 |
^ (self new) |
1352 | 306 |
setBlock:aBlock |
307 |
arguments:aCollectionOfArguments |
|
145 | 308 |
|
309 |
"Created: 16.12.1995 / 19:20:14 / cg" |
|
310 |
! ! |
|
311 |
||
312 |
!BlockValue methodsFor:'accessing'! |
|
313 |
||
314 |
setBlock:aBlock |
|
382 | 315 |
"set the receivers action block" |
316 |
||
145 | 317 |
block := aBlock. |
318 |
arguments notNil ifTrue:[ |
|
382 | 319 |
self release |
145 | 320 |
]. |
321 |
arguments := nil. |
|
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|
322 |
cachedValue := NeverComputed. |
145 | 323 |
|
324 |
"Created: 16.12.1995 / 19:16:59 / cg" |
|
382 | 325 |
"Modified: 22.1.1997 / 19:05:54 / cg" |
326 |
! |
|
327 |
||
328 |
setBlock:aBlock argumentArray:anArgumentCollection |
|
329 |
"set the receivers action block, and define an arguments collection |
|
330 |
to be passed to it. |
|
331 |
A change in any element of the collection will force reevaluation of the |
|
332 |
action block (passing the collection as a single argument) |
|
333 |
- possibly generating another change from myself" |
|
334 |
||
335 |
block := aBlock. |
|
336 |
arguments notNil ifTrue:[ |
|
337 |
self release |
|
338 |
]. |
|
339 |
arguments := Array with:anArgumentCollection. |
|
340 |
anArgumentCollection do:[:arg | |
|
341 |
arg addDependent:self |
|
342 |
]. |
|
343 |
cachedValue := NeverComputed. |
|
344 |
||
345 |
"Modified: 22.1.1997 / 19:08:51 / cg" |
|
346 |
"Created: 22.1.1997 / 19:22:13 / cg" |
|
145 | 347 |
! |
348 |
||
349 |
setBlock:aBlock arguments:aCollectionOfArguments |
|
382 | 350 |
"set the receivers action block, and define arguments to be passed to it. |
351 |
A change in any of the arguments will force reevaluation of the action |
|
352 |
block - possibly generating another change from myself" |
|
353 |
||
145 | 354 |
block := aBlock. |
355 |
arguments notNil ifTrue:[ |
|
382 | 356 |
self release |
145 | 357 |
]. |
358 |
arguments := aCollectionOfArguments. |
|
359 |
arguments do:[:arg | |
|
382 | 360 |
arg addDependent:self |
145 | 361 |
]. |
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362 |
cachedValue := NeverComputed. |
145 | 363 |
|
364 |
"Created: 16.12.1995 / 19:21:41 / cg" |
|
382 | 365 |
"Modified: 22.1.1997 / 19:08:51 / cg" |
145 | 366 |
! |
367 |
||
155 | 368 |
setValue:newValue |
369 |
"physically set my value, without change notifications. |
|
370 |
This is a noop here, since my value is computed." |
|
371 |
||
372 |
^ self |
|
373 |
||
374 |
||
375 |
! |
|
376 |
||
145 | 377 |
value |
382 | 378 |
"retrieve my value - this does not always evaluate the action block, |
379 |
since the returned value is cached internally" |
|
380 |
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|
381 |
cachedValue == NeverComputed ifTrue:[ |
491 | 382 |
cachedValue := self computeValue |
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|
383 |
]. |
145 | 384 |
^ cachedValue |
385 |
||
386 |
"Created: 16.12.1995 / 19:23:26 / cg" |
|
382 | 387 |
"Modified: 22.1.1997 / 19:06:59 / cg" |
145 | 388 |
! ! |
389 |
||
347 | 390 |
!BlockValue methodsFor:'change & update'! |
145 | 391 |
|
1788 | 392 |
recomputeValue |
393 |
"reevaluate my actionBlock, and possibly send a change notification to my dependents" |
|
382 | 394 |
|
145 | 395 |
|oldValue| |
396 |
||
397 |
oldValue := cachedValue. |
|
491 | 398 |
cachedValue := self computeValue. |
145 | 399 |
oldValue ~~ cachedValue ifTrue:[ |
382 | 400 |
self changed:#value |
145 | 401 |
]. |
1788 | 402 |
! |
403 |
||
404 |
update:something with:aParameter from:someone |
|
405 |
"the one I depend on has changed - reevaluate my actionBlock, |
|
406 |
and possibly send a change notification to my dependents" |
|
407 |
||
408 |
self recomputeValue |
|
145 | 409 |
|
410 |
"Created: 16.12.1995 / 19:22:54 / cg" |
|
382 | 411 |
"Modified: 22.1.1997 / 19:07:39 / cg" |
145 | 412 |
! ! |
413 |
||
1788 | 414 |
!BlockValue methodsFor:'misc'! |
415 |
||
416 |
computeValue |
|
417 |
"evaluate the receivers action block" |
|
418 |
||
419 |
|sz arg1 arg2 argValues| |
|
420 |
||
421 |
arguments isNil ifTrue:[ |
|
422 |
^ block value |
|
423 |
]. |
|
424 |
sz := arguments size. |
|
425 |
sz == 0 ifTrue:[ |
|
426 |
^ block value |
|
427 |
]. |
|
428 |
arg1 := (arguments at:1) value. |
|
429 |
sz == 1 ifTrue:[ |
|
430 |
^ block value:arg1 |
|
431 |
]. |
|
432 |
arg2 := (arguments at:2) value. |
|
433 |
sz == 2 ifTrue:[ |
|
434 |
^ block value:arg1 value:arg2 |
|
435 |
]. |
|
436 |
"/ do not evaluate arg[1-2] twice |
|
437 |
argValues := Array new:arguments size. |
|
438 |
argValues at:1 put:arg1. "/ do not evaluate twice |
|
439 |
argValues at:2 put:arg2. "/ do not evaluate twice |
|
440 |
3 to:arguments size do:[:i | argValues at:i put:(arguments at:i) value]. |
|
441 |
||
442 |
^ block valueWithArguments:argValues |
|
443 |
||
444 |
"Created: 16.12.1995 / 19:27:40 / cg" |
|
445 |
"Modified: 22.1.1997 / 19:05:57 / cg" |
|
446 |
! |
|
447 |
||
448 |
dependOn:someObject |
|
449 |
"arrange for the blockValue to be reevaluated, whenever someObject |
|
450 |
changes (i.e. sends a change notification)" |
|
451 |
||
452 |
arguments isNil ifTrue:[ |
|
453 |
arguments := Array with:someObject |
|
454 |
] ifFalse:[ |
|
455 |
arguments := arguments copyWith:someObject |
|
456 |
]. |
|
457 |
someObject addDependent:self |
|
458 |
||
459 |
"Modified: 22.1.1997 / 19:05:26 / cg" |
|
460 |
! |
|
461 |
||
462 |
resetValue |
|
463 |
"evaluate the receivers action block" |
|
464 |
||
465 |
cachedValue := self computeValue |
|
466 |
! ! |
|
467 |
||
145 | 468 |
!BlockValue methodsFor:'release'! |
469 |
||
470 |
release |
|
382 | 471 |
"release any dependencies upon the arguments" |
472 |
||
145 | 473 |
arguments notNil ifTrue:[ |
382 | 474 |
arguments do:[:arg | arg removeDependent:self]. |
145 | 475 |
]. |
476 |
||
382 | 477 |
"Modified: 22.1.1997 / 19:08:06 / cg" |
145 | 478 |
! ! |
479 |
||
480 |
!BlockValue class methodsFor:'documentation'! |
|
481 |
||
482 |
version |
|
1815 | 483 |
^ '$Header: /cvs/stx/stx/libview2/BlockValue.st,v 1.21 2003-09-12 14:00:17 cg Exp $' |
145 | 484 |
! ! |
1665 | 485 |
|
146
9603cec98ac2
oops change notification was wrong
Claus Gittinger <cg@exept.de>
parents:
145
diff
changeset
|
486 |
BlockValue initialize! |