"
 COPYRIGHT (c) 1991 by Claus Gittinger
	      All Rights Reserved

 This software is furnished under a license and may be used
 only in accordance with the terms of that license and with the
 inclusion of the above copyright notice.   This software may not
 be provided or otherwise made available to, or used by, any
 other person.  No title to or ownership of the software is
 hereby transferred.
"

'From Smalltalk/X, Version:2.10.5 on 14-mar-1995 at 11:06:48 am'!

OrderedCollection subclass:#RadioButtonGroup
	 instanceVariableNames:''
	 classVariableNames:''
	 poolDictionaries:''
	 category:'Views-Support'
!

RadioButtonGroup comment:'
COPYRIGHT (c) 1991 by Claus Gittinger
	      All Rights Reserved

$Header: /cvs/stx/stx/libwidg/Attic/RButtGrp.st,v 1.10 1995-04-11 16:24:11 claus Exp $
'!

!RadioButtonGroup class methodsFor:'documentation '!

copyright
"
 COPYRIGHT (c) 1991 by Claus Gittinger
	      All Rights Reserved

 This software is furnished under a license and may be used
 only in accordance with the terms of that license and with the
 inclusion of the above copyright notice.   This software may not
 be provided or otherwise made available to, or used by, any
 other person.  No title to or ownership of the software is
 hereby transferred.
"
!

version
"
$Header: /cvs/stx/stx/libwidg/Attic/RButtGrp.st,v 1.10 1995-04-11 16:24:11 claus Exp $
"
!

documentation
"
    RadioButtonGroups control the interaction between RadioButtons
    turning off other button(s) when one of the group is pressed.
    To group some buttons (and have one-on behavior) use:

	|g|

	g := RadioButtonGroup new.
	...
	b1 := RadioButton label:....
	g add:b1
	...
	b2 := RadioButton label:....
	g add:b2
	...

    example (using Toggles for 'at most one-on behavior'):

	|top panel toggle b g|

	top := StandardSystemView new.
	panel := HorizontalPanelView origin:0.0@0.0 corner:1.0@1.0 in:top.
	g := RadioButtonGroup new.
	b := Toggle label:'one' in:panel.
	g add:b.
	b := Toggle label:'two' in:panel.
	g add:b.
	b := Toggle label:'three' in:panel.
	g add:b.
	top extent:(panel preferedExtent).
	top open.

    example (using RadioButtons for 'one-on behavior'):

	|top panel toggle b g|

	top := StandardSystemView new.
	panel := HorizontalPanelView origin:0.0@0.0 corner:1.0@1.0 in:top.
	g := RadioButtonGroup new.
	b := RadioButton label:'one' in:panel.
	g add:b.
	b := RadioButton label:'two' in:panel.
	g add:b.
	b := RadioButton label:'three' in:panel.
	g add:b.
	top extent:(panel preferedExtent).
	top open.

    example (same, with button 'two' initially on):

	|top panel toggle b g|

	top := StandardSystemView new.
	panel := HorizontalPanelView origin:0.0@0.0 corner:1.0@1.0 in:top.
	g := RadioButtonGroup new.
	b := RadioButton label:'one' in:panel.
	g add:b.
	b := RadioButton label:'two' in:panel.
	g add:b.
	b turnOn.
	b := RadioButton label:'three' in:panel.
	g add:b.
	top extent:(panel preferedExtent).
	top open.
"
! !

!RadioButtonGroup methodsFor:'adding / removing'!

add:aRadioButton
    super add:aRadioButton.
    aRadioButton model:self; change:#elementChanged:from:.
"/    aRadioButton addDependent:self.
    (aRadioButton respondsTo:#group) ifTrue:[aRadioButton group:self]
! !

!RadioButtonGroup methodsFor:'update'!

update:something with:someArgument from:changedButton
    (self includes:changedButton) ifFalse:[^ self].

    "a RadioButton in this group has changed - notify the others"

"/    "in case we have a toggle in the group, 
"/     and it has been turned off - turn it on again
"/    "
"/    changedButton isOn ifFalse:[
"/        changedButton toggleNoAction.
"/        ^ self
"/    ].
    self do:[:aButton |
	(aButton == changedButton) ifFalse:[
	    aButton isOn ifTrue:[
		aButton turnOff
	    ]
	]
    ]
!

elementChanged:aToggle
    self do:[:aButton |
	(aButton == aToggle) ifFalse:[
	    aButton isOn ifTrue:[
		aButton turnOff
	    ]
	]
    ]
!

elementChanged:newValue from:aToggle
    self do:[:aButton |
	(aButton == aToggle) ifFalse:[
	    aButton isOn ifTrue:[
		aButton turnOff
	    ]
	]
    ]
! !