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COPYRIGHT (c) 1991 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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'From Smalltalk/X, Version:2.10.5 on 14-mar-1995 at 11:06:48 am'!
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OrderedCollection subclass:#RadioButtonGroup
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instanceVariableNames:'valueChannel groupID'
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classVariableNames:''
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poolDictionaries:''
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category:'Views-Support'
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!
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RadioButtonGroup comment:'
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COPYRIGHT (c) 1991 by Claus Gittinger
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All Rights Reserved
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$Header: /cvs/stx/stx/libwidg/RadioButtonGroup.st,v 1.13 1995-09-07 12:45:50 claus Exp $
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'!
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!RadioButtonGroup class methodsFor:'documentation '!
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copyright
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"
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COPYRIGHT (c) 1991 by Claus Gittinger
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59
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All Rights Reserved
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0
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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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version
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"
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$Header: /cvs/stx/stx/libwidg/RadioButtonGroup.st,v 1.13 1995-09-07 12:45:50 claus Exp $
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"
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!
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documentation
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"
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RadioButtonGroups control the interaction between RadioButtons
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turning off other button(s) when one of the group is pressed.
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To group some buttons (and have one-on behavior) use:
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|g|
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g := RadioButtonGroup new.
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...
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b1 := RadioButton label:....
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g add:b1
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...
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b2 := RadioButton label:....
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g add:b2
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...
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A radioButtonGroup installs itself as the model of its toggles or
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radioButtons. Therefore, you can no longer operate the individual
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elements on models.
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Instead, the group now provides a valueHolder which takes as value
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the index of the selected toggle. You can set/get this valueHolder
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via the valueChannel:/valueChannel messages.
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See the last example for how this is done.
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The groupID instance variable is not required for normal operation;
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the interface builder uses it to give a button-group some descriptive
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(unique) name.
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"
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!
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examples
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"
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example (using Toggles for 'at most one-on behavior'):
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|top panel toggle b g|
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top := StandardSystemView new.
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panel := HorizontalPanelView origin:0.0@0.0 corner:1.0@1.0 in:top.
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g := RadioButtonGroup new.
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b := Toggle label:'one' in:panel.
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g add:b.
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b := Toggle label:'two' in:panel.
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g add:b.
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b := Toggle label:'three' in:panel.
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g add:b.
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top extent:(panel preferredExtent).
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top open.
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example (using RadioButtons for 'one-on behavior'):
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|top panel toggle b g|
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top := StandardSystemView new.
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panel := HorizontalPanelView origin:0.0@0.0 corner:1.0@1.0 in:top.
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g := RadioButtonGroup new.
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b := RadioButton label:'one' in:panel.
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g add:b.
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b := RadioButton label:'two' in:panel.
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g add:b.
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b := RadioButton label:'three' in:panel.
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g add:b.
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top extent:(panel preferredExtent).
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top open.
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example (same, with button 'two' initially on):
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|top panel toggle b g|
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top := StandardSystemView new.
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panel := HorizontalPanelView origin:0.0@0.0 corner:1.0@1.0 in:top.
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g := RadioButtonGroup new.
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b := RadioButton label:'one' in:panel.
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g add:b.
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b := RadioButton label:'two' in:panel.
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g add:b.
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b turnOn.
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b := RadioButton label:'three' in:panel.
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g add:b.
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top extent:(panel preferredExtent).
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top open.
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example (operating on a model)
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|selected dialog group|
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selected := 2 asValue.
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dialog := Dialog new.
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group := RadioButtonGroup new.
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group add:(dialog addCheckBox:'one' on:nil) toggleView.
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group add:(dialog addCheckBox:'two' on:nil) toggleView.
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group add:(dialog addCheckBox:'three' on:nil) toggleView.
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group valueChannel:selected.
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dialog addAbortButton; addOkButton.
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dialog open.
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dialog accepted ifTrue:[
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Transcript showCr:'you selected: ' , selected value printString
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]
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"
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! !
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!RadioButtonGroup methodsFor:'accessing'!
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groupID:aSymbol
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groupID := aSymbol
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"Modified: 5.9.1995 / 16:04:28 / claus"
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!
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groupID
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^ groupID
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"Modified: 5.9.1995 / 16:04:33 / claus"
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! !
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!RadioButtonGroup methodsFor:'accessing-mvc'!
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valueChannel
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^ valueChannel
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valueChannel:aValueHolder
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|oldValue newValue|
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valueChannel notNil ifTrue:[oldValue := valueChannel value].
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valueChannel := aValueHolder.
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(newValue := valueChannel value) ~~ oldValue ifTrue:[
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(self at:newValue) turnOn
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]
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! !
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!RadioButtonGroup methodsFor:'adding / removing'!
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add:aRadioButton
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super add:aRadioButton.
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"
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this would work, if dependencies were not weak ...
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"
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"/ aRadioButton addDependent:self.
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"
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therefore, we have to install ourself as model of the buttons/toggles
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creating a valueChannel, if there is none yet.
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"
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valueChannel isNil ifTrue:[
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valueChannel := 0 asValue
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].
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aRadioButton isOn ifTrue:[valueChannel value:self size].
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aRadioButton model:self; aspectMessage:nil; changeMessage:#elementChanged:from:.
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! !
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!RadioButtonGroup methodsFor:'update'!
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update:something with:someArgument from:changedButton
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(self includes:changedButton) ifFalse:[^ self].
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"
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a RadioButton in this group has changed - notify the others
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"/ "in case we have a toggle in the group,
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"/ and it has been turned off - turn it on again
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"/ "
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"/ changedButton isOn ifFalse:[
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"/ changedButton toggleNoAction.
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"/ ^ self
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"/ ].
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self elementChanged:(changedButton isOn) from:changedButton
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!
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elementChanged:aToggle
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"historic compatibility leftover - will vanish"
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^ self elementChanged:true from:aToggle
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!
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elementChanged:value from:aToggle
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"some element changed its value - find it, turn the others off
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and update my value"
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|newValue|
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self keysAndValuesDo:[:index :aButton |
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(aButton == aToggle) ifFalse:[
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aButton isOn ifTrue:[
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aButton turnOff
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]
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] ifTrue:[
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value ifTrue:[newValue := index]
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]
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].
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valueChannel value:newValue
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! !
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