"

 COPYRIGHT (c) 1995 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.

"

"{ Package: 'stx:libwidg' }"

"{ NameSpace: Smalltalk }"

ButtonController subclass:#ToggleController

	instanceVariableNames:'action'

	classVariableNames:''

	poolDictionaries:''

	category:'Interface-Support-Controllers'

!

!ToggleController class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1995 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.

"

!

documentation

"

    ToggleControllers redefine some of ButtonControllers behavior;

    user interaction: they always triggerOnDown, and ignore buttonrelease.

    Finally, every buttonPress leads to a toggle action.

    ToggleController adds another actionBlock, since it inherits press-

    and releaseActions, while we want one actionBlock to be used for both

    on- and off. The actionBlock (if any) is evaluated with the current

    toggles state if it expects an argument, or without argument if it's a no-arg

    block.

    Other than that, all model relations are inherited - i.e. if the view has a model,

    that one gets change-messages and the toggle updates on aspect changes.

    [author:]

        Claus Gittinger

"

! !

!ToggleController methodsFor:'accessing'!

action:aBlock

    "set the action to be performed. This is called

     with the toggles state as argument."

    action := aBlock

! !

!ToggleController methodsFor:'events'!

keyPress:key x:x y:y

    "toggle on space"

    <resource: #keyboard (#Space)>

    (key == Character space) ifTrue:[

        enableChannel value ifTrue:[

            self toggle.

            ^ self

        ].

    ].

    super keyPress:key x:x y:y

!

performAction

    "the toggle changed its state; first tell the model and

     channels, then evaluate any (optional) press/release actions,

     finally evaluate my real action, the toggle action.

     Individual press/release actions are usually nil for toggles."

    super performAction.

    action notNil ifTrue:[

        active := true.

        action valueWithOptionalArgument:pressed.

        active := false.

    ].

    "Modified: 24.1.1997 / 15:42:14 / cg"

! !

!ToggleController methodsFor:'initialization'!

initialize

    <modifier: #super> "must be called if redefined"

    super initialize.

    self beToggle

    "Modified: / 08-02-2017 / 00:34:39 / cg"

! !

!ToggleController class methodsFor:'documentation'!

version

    ^ '$Header$'

!

version_CVS

    ^ '$Header$'

! !