author | Claus Gittinger <cg@exept.de> |
Fri, 21 Mar 2003 18:07:42 +0100 | |
changeset 1721 | 61b4b99ffce6 |
parent 1701 | 4a6810f39053 |
child 1788 | 7edafbabe844 |
permissions | -rw-r--r-- |
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" |
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COPYRIGHT (c) 1995 by Claus Gittinger |
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All Rights Reserved |
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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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"{ Package: 'stx:libview2' }" |
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ValueModel subclass:#BlockValue |
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instanceVariableNames:'cachedValue arguments block' |
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classVariableNames:'NeverComputed' |
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poolDictionaries:'' |
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category:'Interface-Support-Models' |
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! |
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!BlockValue class methodsFor:'documentation'! |
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copyright |
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" |
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COPYRIGHT (c) 1995 by Claus Gittinger |
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All Rights Reserved |
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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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! |
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documentation |
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" |
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BlockValues depend on multiple other objects (typically valueHolders) |
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and recompute a value whenever one of them changes. |
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If the new value is different, it triggers itself a change to its dependents. |
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Example use is to base an enableChannels value on multiple other boolean values. |
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(See example for how this is done) |
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Notice: |
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this class was implemented using protocol information |
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from alpha testers - it may not be complete or compatible to |
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the corresponding ST-80 class. |
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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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[author:] |
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Claus Gittinger |
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" |
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! |
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examples |
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" |
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checkToggle 3 shows the value of toggle1 AND toggle2 |
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[exBegin] |
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|val1 val2 both box| |
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val1 := false asValue. |
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val2 := false asValue. |
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both := BlockValue |
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with:[:v1 :v2 | |
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Transcript showCR:'evaluating ...'. |
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v1 value and:[v2 value] |
74 |
] |
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arguments:(Array with:val1 with:val2). |
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box := Dialog new. |
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box addCheckBox:'one' on:val1. |
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box addCheckBox:'two' on:val2. |
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box addHorizontalLine. |
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box addCheckBox:'both' on:both. |
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box addOkButton. |
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box open |
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[exEnd] |
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the same, using a convenient instance creation message: |
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[exBegin] |
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|val1 val2 both box| |
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val1 := false asValue. |
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val2 := false asValue. |
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both := BlockValue forLogical:val1 and:val2. |
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box := Dialog new. |
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box addCheckBox:'one' on:val1. |
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box addCheckBox:'two' on:val2. |
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box addHorizontalLine. |
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(box addCheckBox:'both' on:both) disable. |
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box addOkButton. |
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box open |
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[exEnd] |
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logical or: |
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[exBegin] |
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|val1 val2 both box| |
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val1 := false asValue. |
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val2 := false asValue. |
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both := BlockValue forLogical:val1 or:val2. |
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box := Dialog new. |
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box addCheckBox:'one' on:val1. |
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box addCheckBox:'two' on:val2. |
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box addHorizontalLine. |
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box addCheckBox:'both' on:both. |
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box addOkButton. |
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box open |
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[exEnd] |
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example use: enabling an element depending on two others: |
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[exBegin] |
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|val1 val2 enabler val3 box| |
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val1 := false asValue. |
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val2 := false asValue. |
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val3 := false asValue. |
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enabler := BlockValue forLogical:val1 and:val2. |
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box := Dialog new. |
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box addCheckBox:'one' on:val1. |
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box addCheckBox:'two' on:val2. |
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box addHorizontalLine. |
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(box addCheckBox:'three (both of the above)' on:val3) enableChannel:enabler. |
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box addOkButton. |
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box open |
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[exEnd] |
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like above, using a logical-or block: |
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[exBegin] |
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|val1 val2 enabler val3 box| |
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val1 := false asValue. |
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val2 := false asValue. |
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val3 := false asValue. |
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enabler := BlockValue forLogical:val1 or:val2. |
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box := Dialog new. |
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box addCheckBox:'one' on:val1. |
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box addCheckBox:'two' on:val2. |
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box addHorizontalLine. |
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(box addCheckBox:'three (any of the above)' on:val3) enableChannel:enabler. |
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box addOkButton. |
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box open |
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[exEnd] |
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like above, using a bunch of toggles: |
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[exBegin] |
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|values anyValue box| |
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values := (1 to:10) collect:[:i | false asValue]. |
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anyValue := BlockValue forLogicalOrAll:values. |
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anyValue onChangeSend:#value to:[Transcript showCR:'any is true']. |
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box := Dialog new. |
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values keysAndValuesDo:[:index :aValueHolder | |
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box addCheckBox:index printString on:aValueHolder. |
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]. |
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box addHorizontalLine. |
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(box addOkButton) enableChannel:anyValue. |
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box open |
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[exEnd] |
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" |
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! ! |
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!BlockValue class methodsFor:'initialization'! |
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initialize |
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NeverComputed isNil ifTrue:[ |
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NeverComputed := Object new. |
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] |
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! ! |
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!BlockValue class methodsFor:'instance creation'! |
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block:aBlock arguments:aCollectionOfArguments |
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"return a new BlockValue computing aBlock. |
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Same as #with:arguments: for ST80 compatibility" |
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^ self with:aBlock arguments:aCollectionOfArguments |
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"Created: / 20.6.1998 / 14:00:16 / cg" |
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! |
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forLogical:arg1 and:arg2 |
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"return a new BlockValue computing the logical AND of its args |
198 |
(which are usually other valueHolders)" |
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^ (super new) |
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setBlock:[:a :b | a value and:[b value]] |
202 |
arguments:(Array with:arg1 with:arg2) |
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"Created: / 16.12.1995 / 19:20:14 / cg" |
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"Modified: / 30.1.2000 / 23:24:50 / cg" |
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! |
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forLogical:arg1 or:arg2 |
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"return a new BlockValue computing the logical OR of its args |
210 |
(which are usually other valueHolders)" |
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^ (super new) |
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setBlock:[:a :b | a value or:[b value]] |
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arguments:(Array with:arg1 with:arg2) |
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"Created: / 16.12.1995 / 19:20:14 / cg" |
217 |
"Modified: / 30.1.2000 / 23:24:46 / cg" |
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! |
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forLogicalAndAll:argArray |
221 |
"return a new BlockValue computing the logical OR of all elements |
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in the passed argArray (which are usually other valueHolders)" |
382 | 223 |
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^ (super new) |
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setBlock:[:a | (argArray findFirst:[:a | a value not]) == 0] |
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argumentArray:argArray asArray |
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"Created: / 22.1.1997 / 19:12:44 / cg" |
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"Modified: / 28.4.1998 / 20:16:38 / ca" |
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"Modified: / 30.1.2000 / 23:24:40 / cg" |
382 | 231 |
! |
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forLogicalNot:arg |
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"return a new BlockValue computing the logical NOT of its arg |
235 |
(which is usually another valueHolder)" |
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^ (super new) |
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setBlock:[:a | a value not] |
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arguments:(Array with:arg) |
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"Created: / 17.8.1998 / 10:06:41 / cg" |
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"Modified: / 30.1.2000 / 23:24:18 / cg" |
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! |
244 |
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forLogicalOrAll:argArray |
246 |
"return a new BlockValue computing the logical OR of all elements |
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in the passed argArray (which are usually other valueHolders)" |
382 | 248 |
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^ (super new) |
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setBlock:[:arg | (arg findFirst:[:el | el value]) ~~ 0] |
911 | 251 |
argumentArray:argArray asArray |
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"Created: / 22.1.1997 / 19:13:01 / cg" |
254 |
"Modified: / 28.4.1998 / 20:20:09 / ca" |
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"Modified: / 30.1.2000 / 23:24:34 / cg" |
382 | 256 |
! |
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with:aBlock |
259 |
"return a new BlockValue computing aBlock" |
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^ (super new) setBlock:aBlock |
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"Created: 16.12.1995 / 19:16:33 / cg" |
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! |
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with:aBlock argument:anArgument |
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"return a new BlockValue computing aBlock" |
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^ (super new) |
270 |
setBlock:aBlock |
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arguments:(Array with:anArgument) |
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"Created: 16.12.1995 / 19:20:14 / cg" |
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! |
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with:aBlock argument:anArgument1 argument:anArgument2 |
277 |
"return a new BlockValue computing aBlock" |
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^ (super new) |
280 |
setBlock:aBlock |
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arguments:(Array with:anArgument1 with:anArgument2) |
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283 |
"Created: 16.12.1995 / 19:20:14 / cg" |
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284 |
! |
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285 |
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with:aBlock argument:anArgument1 argument:anArgument2 argument:anArgument3 |
287 |
"return a new BlockValue computing aBlock" |
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288 |
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289 |
^ (super new) |
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290 |
setBlock:aBlock |
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291 |
arguments:(Array with:anArgument1 with:anArgument2 with:anArgument3) |
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292 |
||
293 |
! |
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294 |
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145 | 295 |
with:aBlock arguments:aCollectionOfArguments |
296 |
"return a new BlockValue computing aBlock" |
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297 |
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^ (super new) |
299 |
setBlock:aBlock |
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300 |
arguments:aCollectionOfArguments |
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302 |
"Created: 16.12.1995 / 19:20:14 / cg" |
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! ! |
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304 |
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305 |
!BlockValue methodsFor:'accessing'! |
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306 |
||
491 | 307 |
computeValue |
308 |
"evaluate the receivers action block" |
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309 |
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1665 | 310 |
|sz arg1 arg2 argValues| |
491 | 311 |
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312 |
arguments isNil ifTrue:[ |
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313 |
^ block value |
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314 |
]. |
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315 |
sz := arguments size. |
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316 |
sz == 0 ifTrue:[ |
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317 |
^ block value |
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318 |
]. |
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1665 | 319 |
arg1 := (arguments at:1) value. |
491 | 320 |
sz == 1 ifTrue:[ |
1665 | 321 |
^ block value:arg1 |
491 | 322 |
]. |
1665 | 323 |
arg2 := (arguments at:2) value. |
491 | 324 |
sz == 2 ifTrue:[ |
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325 |
^ block value:arg1 value:arg2 |
491 | 326 |
]. |
1665 | 327 |
"/ do not evaluate arg[1-2] twice |
328 |
argValues := Array new:arguments size. |
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329 |
argValues at:1 put:arg1. "/ do not evaluate twice |
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330 |
argValues at:2 put:arg2. "/ do not evaluate twice |
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331 |
3 to:arguments size do:[:i | argValues at:i put:(arguments at:i) value]. |
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332 |
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333 |
^ block valueWithArguments:argValues |
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491 | 334 |
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335 |
"Created: 16.12.1995 / 19:27:40 / cg" |
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336 |
"Modified: 22.1.1997 / 19:05:57 / cg" |
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337 |
! |
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338 |
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145 | 339 |
dependOn:someObject |
382 | 340 |
"arrange for the blockValue to be reevaluated, whenever someObject |
341 |
changes (i.e. sends a change notification)" |
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342 |
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145 | 343 |
arguments isNil ifTrue:[ |
382 | 344 |
arguments := Array with:someObject |
145 | 345 |
] ifFalse:[ |
382 | 346 |
arguments := arguments copyWith:someObject |
145 | 347 |
]. |
348 |
someObject addDependent:self |
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349 |
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382 | 350 |
"Modified: 22.1.1997 / 19:05:26 / cg" |
145 | 351 |
! |
352 |
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353 |
evaluate |
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382 | 354 |
"evaluate the receivers action block" |
355 |
||
145 | 356 |
arguments isNil ifTrue:[ |
382 | 357 |
^ block value |
145 | 358 |
]. |
359 |
^ block valueWithArguments:(arguments asArray) |
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360 |
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361 |
"Created: 16.12.1995 / 19:27:40 / cg" |
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382 | 362 |
"Modified: 22.1.1997 / 19:05:57 / cg" |
145 | 363 |
! |
364 |
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365 |
setBlock:aBlock |
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382 | 366 |
"set the receivers action block" |
367 |
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145 | 368 |
block := aBlock. |
369 |
arguments notNil ifTrue:[ |
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382 | 370 |
self release |
145 | 371 |
]. |
372 |
arguments := nil. |
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373 |
cachedValue := NeverComputed. |
145 | 374 |
|
375 |
"Created: 16.12.1995 / 19:16:59 / cg" |
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382 | 376 |
"Modified: 22.1.1997 / 19:05:54 / cg" |
377 |
! |
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378 |
||
379 |
setBlock:aBlock argumentArray:anArgumentCollection |
|
380 |
"set the receivers action block, and define an arguments collection |
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381 |
to be passed to it. |
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382 |
A change in any element of the collection will force reevaluation of the |
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383 |
action block (passing the collection as a single argument) |
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384 |
- possibly generating another change from myself" |
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385 |
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386 |
block := aBlock. |
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387 |
arguments notNil ifTrue:[ |
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388 |
self release |
|
389 |
]. |
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390 |
arguments := Array with:anArgumentCollection. |
|
391 |
anArgumentCollection do:[:arg | |
|
392 |
arg addDependent:self |
|
393 |
]. |
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394 |
cachedValue := NeverComputed. |
|
395 |
||
396 |
"Modified: 22.1.1997 / 19:08:51 / cg" |
|
397 |
"Created: 22.1.1997 / 19:22:13 / cg" |
|
145 | 398 |
! |
399 |
||
400 |
setBlock:aBlock arguments:aCollectionOfArguments |
|
382 | 401 |
"set the receivers action block, and define arguments to be passed to it. |
402 |
A change in any of the arguments will force reevaluation of the action |
|
403 |
block - possibly generating another change from myself" |
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404 |
||
145 | 405 |
block := aBlock. |
406 |
arguments notNil ifTrue:[ |
|
382 | 407 |
self release |
145 | 408 |
]. |
409 |
arguments := aCollectionOfArguments. |
|
410 |
arguments do:[:arg | |
|
382 | 411 |
arg addDependent:self |
145 | 412 |
]. |
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413 |
cachedValue := NeverComputed. |
145 | 414 |
|
415 |
"Created: 16.12.1995 / 19:21:41 / cg" |
|
382 | 416 |
"Modified: 22.1.1997 / 19:08:51 / cg" |
145 | 417 |
! |
418 |
||
155 | 419 |
setValue:newValue |
420 |
"physically set my value, without change notifications. |
|
421 |
This is a noop here, since my value is computed." |
|
422 |
||
423 |
^ self |
|
424 |
||
425 |
||
426 |
! |
|
427 |
||
145 | 428 |
value |
382 | 429 |
"retrieve my value - this does not always evaluate the action block, |
430 |
since the returned value is cached internally" |
|
431 |
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9603cec98ac2
oops change notification was wrong
Claus Gittinger <cg@exept.de>
parents:
145
diff
changeset
|
432 |
cachedValue == NeverComputed ifTrue:[ |
491 | 433 |
cachedValue := self computeValue |
146
9603cec98ac2
oops change notification was wrong
Claus Gittinger <cg@exept.de>
parents:
145
diff
changeset
|
434 |
]. |
145 | 435 |
^ cachedValue |
436 |
||
437 |
"Created: 16.12.1995 / 19:23:26 / cg" |
|
382 | 438 |
"Modified: 22.1.1997 / 19:06:59 / cg" |
145 | 439 |
! ! |
440 |
||
347 | 441 |
!BlockValue methodsFor:'change & update'! |
145 | 442 |
|
443 |
update:something with:aParameter from:someone |
|
382 | 444 |
"the one I depend on has changed - reevaluate may actionBlock, |
445 |
and possibly send a change notification to my dependents" |
|
446 |
||
145 | 447 |
|oldValue| |
448 |
||
449 |
oldValue := cachedValue. |
|
491 | 450 |
cachedValue := self computeValue. |
145 | 451 |
oldValue ~~ cachedValue ifTrue:[ |
382 | 452 |
self changed:#value |
145 | 453 |
]. |
454 |
||
455 |
"Created: 16.12.1995 / 19:22:54 / cg" |
|
382 | 456 |
"Modified: 22.1.1997 / 19:07:39 / cg" |
145 | 457 |
! ! |
458 |
||
459 |
!BlockValue methodsFor:'release'! |
|
460 |
||
461 |
release |
|
382 | 462 |
"release any dependencies upon the arguments" |
463 |
||
145 | 464 |
arguments notNil ifTrue:[ |
382 | 465 |
arguments do:[:arg | arg removeDependent:self]. |
145 | 466 |
]. |
467 |
||
382 | 468 |
"Modified: 22.1.1997 / 19:08:06 / cg" |
145 | 469 |
! ! |
470 |
||
471 |
!BlockValue class methodsFor:'documentation'! |
|
472 |
||
473 |
version |
|
1701
4a6810f39053
only one #value should be sent to arg2 in #computeValue.
Claus Gittinger <cg@exept.de>
parents:
1665
diff
changeset
|
474 |
^ '$Header: /cvs/stx/stx/libview2/BlockValue.st,v 1.19 2003-02-24 09:33:46 cg Exp $' |
145 | 475 |
! ! |
1665 | 476 |
|
146
9603cec98ac2
oops change notification was wrong
Claus Gittinger <cg@exept.de>
parents:
145
diff
changeset
|
477 |
BlockValue initialize! |