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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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Controller subclass:#ButtonController
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instanceVariableNames:'enableChannel pressChannel releaseChannel pressed active entered
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isTriggerOnDown autoRepeat repeatBlock initialDelay repeatDelay
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pressActionBlock releaseActionBlock isToggle'
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classVariableNames:''
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poolDictionaries:''
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category:'Interface-Support-Controllers'
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!
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!ButtonController 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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ButtonControllers are used with buttons and handle all user interaction.
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These are automatically created when a Button is created, therefore no manual
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action is required for creation.
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In normal applications, you dont have to care for the controller;
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access to the controllers behavior is possible via messages to the button.
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(setting actions, controlling autorepeat etc.)
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See examples in the Button class.
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Instance variables:
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enableChannel <ValueHolder pressing is allowed (default: true)
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on Boolean>
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pressed <Boolean> true if currently pressed (read-only)
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entered <Boolean> true if the cursor is currently in this view
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isTriggerOnDown <Boolean> controls if the action should be executed on
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press or on release (default: on release).
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isToggle <Boolean> controls if the button should show toggle
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behavior (as opposed to one-shot behavior)
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pressActionBlock <Block> block to evaluate when pressed (default: noop)
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releaseActionBlock <Block> block to evaluate when released (default: noop)
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autoRepeat <Boolean> auto-repeats when pressed long enough (default: false)
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initialDelay <Number> seconds till first auto-repeat (default: 0.2)
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repeatDelay <Number> seconds of repeat intervall (default: 0.025)
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repeatBlock <Block> block evaluated for auto-repeat (internal)
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active <Boolean> true during action evaluation (internal)
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"
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!
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version
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^ '$Header: /cvs/stx/stx/libwidg/ButtonController.st,v 1.22 1995-11-23 10:39:34 cg Exp $'
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! !
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!ButtonController class methodsFor:'defaults'!
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defaultInitialDelay
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"when autorepeat is enabled, and button is not released,
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start repeating after initialDelay seconds"
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^ 0.2
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!
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defaultRepeatDelay
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"when autorepeat is enabled, and button is not released,
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repeat every repeatDelay seconds"
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^ 0.025
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! !
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!ButtonController methodsFor:'accessing-behavior'!
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action:aBlock
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"convenient method: depending on the setting the triggerOnDown flag,
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either set the press-action clear any release-action or
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vice versa, set the release-action and clear the press-action."
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isTriggerOnDown ifTrue:[
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releaseActionBlock := nil.
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pressActionBlock := aBlock
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] ifFalse:[
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releaseActionBlock := aBlock.
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pressActionBlock := nil
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]
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!
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autoRepeat
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"turn on autorepeat. OBSOLETE"
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autoRepeat := true.
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repeatBlock := [self repeat]
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!
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autoRepeat:aBoolean
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"turn on/off autorepeat"
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autoRepeat := aBoolean.
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repeatBlock := [self repeat]
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"Modified: 5.9.1995 / 22:06:00 / claus"
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!
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beToggle
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"make the receiver act like a toggle"
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isTriggerOnDown := true.
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isToggle := true
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!
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beTriggerOnDown
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"make the receiver act on button press"
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isTriggerOnDown := true
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!
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beTriggerOnUp
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"make the receiver act on button release"
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isTriggerOnDown := false
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!
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disable
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"disable the button"
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enableChannel value ifTrue:[
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enableChannel value:false.
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"/ view redraw - not needed; I listen to enableChannel
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]
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!
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enable
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"enable the button"
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enableChannel value ifFalse:[
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enableChannel value:true.
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"/ view redraw - not needed; I listen to enableChannel
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]
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!
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isTriggerOnDown
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"return true, if I trigger on press
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(in contrast to triggering on up, which is the default)"
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^ isTriggerOnDown
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!
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pressAction
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"return the pressAction; thats the block which gets evaluated
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when the button is pressed (if non-nil)"
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^ pressActionBlock
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!
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pressAction:aBlock
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"define the action to be performed on press"
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pressActionBlock := aBlock
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!
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releaseAction
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"return the releaseAction; thats the block which gets evaluated
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when the button is relreased (if non-nil)"
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^ releaseActionBlock
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!
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releaseAction:aBlock
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"define the action to be performed on release"
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releaseActionBlock := aBlock
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!
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toggle
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"toggle and perform the action"
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enableChannel value ifTrue:[
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self toggleNoAction.
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self performAction.
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view changed:#toggle with:pressed
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]
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!
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toggleNoAction
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"toggle, but do NOT perform any action"
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pressed ifTrue:[
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view turnOff.
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pressed := false.
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] ifFalse:[
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view turnOn.
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pressed := true.
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].
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!
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triggerOnDown:aBoolean
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"set/clear the flag which controls if the action block is to be evaluated
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on press or on release.
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(see also ST-80 compatibility methods beTriggerOn*)"
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isTriggerOnDown := aBoolean
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! !
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!ButtonController methodsFor:'accessing-channels'!
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enableChannel
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"return the valueHolder which holdes the enable
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boolean value"
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^ enableChannel
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!
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enableChannel:aValueHolder
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"set the valueHolder, which holds the enable boolean value"
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|wasEnabled|
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enableChannel notNil ifTrue:[
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wasEnabled := enableChannel value.
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enableChannel retractInterrestFor:self.
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] ifFalse:[
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wasEnabled := true
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].
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enableChannel := aValueHolder.
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aValueHolder onChangeSend:#enableStateChange to:self.
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enableChannel value ~~ wasEnabled ifTrue:[
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self enableStateChange
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]
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"Modified: 17.9.1995 / 19:41:18 / claus"
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!
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pressChannel:aChannel
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pressChannel := aChannel
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!
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releaseChannel:aChannel
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releaseChannel := aChannel
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! !
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!ButtonController methodsFor:'accessing-state'!
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active
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"return true, if I am active;
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that is: currently performing my action.
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This query can be used to avoid multiple redraws."
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^ active
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!
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active:aBoolean
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active := aBoolean
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!
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enabled
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"return true, if I am enabled"
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^ enableChannel value
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!
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entered
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"return true, if the mouse pointer is currently in my view"
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^ entered
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!
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entered:aBoolean
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entered := aBoolean
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!
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pressed
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"return true, if I am pressed"
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^ pressed
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!
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pressed:aBoolean
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pressed ~~ aBoolean ifTrue:[
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pressed := aBoolean.
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self performAction.
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].
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!
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setPressed:aBoolean
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pressed := aBoolean.
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121
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200
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"Created: 14.11.1995 / 21:37:08 / cg"
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76
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! !
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!ButtonController methodsFor:'event handling'!
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319 |
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buttonMultiPress:button x:x y:y
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^ self buttonPress:button x:x y:y
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!
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323 |
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76
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buttonPress:button x:x y:y
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(button == 1 or:[button == #select]) ifFalse:[
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125
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^ super buttonPress:button x:x y:y
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76
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].
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328 |
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133
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enableChannel value ifTrue:[
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125
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isToggle ifTrue:[
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self toggle.
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^ self
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].
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118
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125
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pressed ifFalse:[
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pressed := true.
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view showActive.
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76
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338 |
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125
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(pressActionBlock notNil or:[model notNil]) ifTrue:[
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"
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force output - so that button is drawn correctly in case
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342 |
of any long-computation (at high priority)
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343 |
"
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view device flush.
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125
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].
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76
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346 |
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125
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self performAction.
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76
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348 |
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125
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autoRepeat ifTrue:[
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350 |
Processor addTimedBlock:repeatBlock afterSeconds:initialDelay
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351 |
]
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352 |
]
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76
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]
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354 |
!
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355 |
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356 |
buttonRelease:button x:x y:y
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357 |
"button was released - if enabled, perform releaseaction"
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358 |
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359 |
(button == 1 or:[button == #select]) ifFalse:[
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125
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360 |
^ super buttonRelease:button x:x y:y
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76
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].
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118
|
362 |
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363 |
isToggle ifTrue:[
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125
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364 |
^ self
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118
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365 |
].
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366 |
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76
|
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pressed ifTrue:[
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125
|
368 |
autoRepeat ifTrue:[
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|
369 |
Processor removeTimedBlock:repeatBlock
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|
370 |
].
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|
371 |
pressed := false.
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372 |
view showPassive.
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76
|
373 |
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133
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enableChannel value ifTrue:[
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125
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375 |
"
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|
376 |
only perform action if released within myself
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377 |
"
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378 |
((x >= 0)
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|
379 |
and:[x <= view width
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380 |
and:[y >= 0
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|
381 |
and:[y <= view height]]]) ifTrue:[
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382 |
(releaseActionBlock notNil or:[model notNil]) ifTrue:[
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383 |
"
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|
384 |
force output - so that button is drawn correctly in case
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|
385 |
of any long-computation (at high priority)
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|
386 |
"
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130
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387 |
view device flush.
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125
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388 |
].
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76
|
389 |
|
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125
|
390 |
self performAction.
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391 |
]
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392 |
]
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76
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393 |
]
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|
394 |
!
|
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|
395 |
|
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200
|
396 |
enableStateChange
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|
397 |
"this is sent, whenever the enable value has changed"
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76
|
398 |
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200
|
399 |
view notNil ifTrue:[view enableStateChangeRedraw]
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|
400 |
|
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|
401 |
"Modified: 17.9.1995 / 19:55:52 / claus"
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76
|
402 |
!
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|
403 |
|
|
200
|
404 |
keyPress:key x:x y:y
|
|
|
405 |
"trigger on Return and space, if I am the focusView of my group
|
|
|
406 |
(i.e. if I got an explicit focus)"
|
|
121
|
407 |
|
|
200
|
408 |
(key == #Return or:[key == Character space]) ifTrue:[
|
|
|
409 |
view hasFocus ifTrue:[
|
|
|
410 |
"just simulate a buttonPress/release here."
|
|
|
411 |
self buttonPress:1 x:0 y:0.
|
|
|
412 |
self buttonRelease:1 x:0 y:0.
|
|
|
413 |
^ self.
|
|
121
|
414 |
]
|
|
200
|
415 |
].
|
|
|
416 |
view keyPress:key x:x y:y
|
|
121
|
417 |
!
|
|
|
418 |
|
|
|
419 |
performAction
|
|
146
|
420 |
|action value|
|
|
133
|
421 |
|
|
|
422 |
isToggle ifTrue:[
|
|
|
423 |
value := pressed
|
|
|
424 |
] ifFalse:[
|
|
|
425 |
value := true
|
|
|
426 |
].
|
|
76
|
427 |
|
|
125
|
428 |
"
|
|
145
|
429 |
ST/X style actionBlock evaluation & channel notification ...
|
|
125
|
430 |
"
|
|
76
|
431 |
pressed ifTrue:[
|
|
145
|
432 |
action := pressActionBlock.
|
|
121
|
433 |
] ifFalse:[
|
|
145
|
434 |
action := releaseActionBlock.
|
|
121
|
435 |
].
|
|
125
|
436 |
action notNil ifTrue:[
|
|
|
437 |
active := true.
|
|
|
438 |
action numArgs == 0 ifTrue:[
|
|
|
439 |
action value
|
|
|
440 |
] ifFalse:[
|
|
133
|
441 |
action value:value
|
|
125
|
442 |
].
|
|
|
443 |
active := false.
|
|
|
444 |
].
|
|
146
|
445 |
pressChannel notNil ifTrue:[
|
|
|
446 |
pressChannel value:pressed
|
|
|
447 |
].
|
|
|
448 |
releaseChannel notNil ifTrue:[
|
|
|
449 |
releaseChannel value:pressed not
|
|
145
|
450 |
].
|
|
76
|
451 |
|
|
125
|
452 |
"
|
|
|
453 |
ST-80 style model notification ...
|
|
|
454 |
"
|
|
121
|
455 |
(isToggle
|
|
|
456 |
or:[(isTriggerOnDown and:[pressed])
|
|
|
457 |
or:[isTriggerOnDown not and:[pressed not]]]) ifTrue:[
|
|
125
|
458 |
"the ST-80 way of doing things"
|
|
|
459 |
view notNil ifTrue:[
|
|
|
460 |
active := true.
|
|
133
|
461 |
view sendChangeMessageWith:value.
|
|
125
|
462 |
active := false.
|
|
|
463 |
].
|
|
121
|
464 |
].
|
|
76
|
465 |
!
|
|
|
466 |
|
|
200
|
467 |
pointerEnter:state x:x y:y
|
|
|
468 |
"mouse pointer entered my view.
|
|
|
469 |
Redraw with enteredColors if they differ from the normal colors"
|
|
|
470 |
|
|
|
471 |
entered := true.
|
|
|
472 |
enableChannel value ifTrue:[
|
|
|
473 |
pressed ifTrue:[
|
|
|
474 |
"
|
|
|
475 |
reentered after a leave with mouse-button down;
|
|
|
476 |
restart autorepeating and/or if I am a button with
|
|
|
477 |
triggerOnDown, show active again.
|
|
|
478 |
"
|
|
|
479 |
autoRepeat ifTrue:[
|
|
|
480 |
Processor addTimedBlock:repeatBlock afterSeconds:initialDelay
|
|
|
481 |
].
|
|
|
482 |
isTriggerOnDown ifFalse:[
|
|
|
483 |
view showActive.
|
|
|
484 |
]
|
|
|
485 |
] ifFalse:[
|
|
|
486 |
view redraw
|
|
|
487 |
]
|
|
|
488 |
]
|
|
76
|
489 |
!
|
|
|
490 |
|
|
200
|
491 |
pointerLeave:state
|
|
|
492 |
"mouse pointer left my view.
|
|
|
493 |
Redraw with normal colors if they differ from enteredColors"
|
|
76
|
494 |
|
|
200
|
495 |
entered := false.
|
|
|
496 |
pressed ifTrue:[
|
|
|
497 |
"
|
|
|
498 |
leave with mouse-button down;
|
|
|
499 |
stop autorepeating and/or if I am a button with
|
|
|
500 |
action on release, show passive
|
|
|
501 |
"
|
|
|
502 |
autoRepeat ifTrue:[
|
|
|
503 |
Processor removeTimedBlock:repeatBlock
|
|
|
504 |
].
|
|
|
505 |
isTriggerOnDown ifFalse:[
|
|
|
506 |
view showPassive.
|
|
76
|
507 |
]
|
|
200
|
508 |
] ifFalse:[
|
|
|
509 |
enableChannel value ifTrue:[
|
|
|
510 |
view redraw
|
|
|
511 |
]
|
|
|
512 |
]
|
|
76
|
513 |
!
|
|
|
514 |
|
|
121
|
515 |
repeat
|
|
|
516 |
"this is sent from the autorepeat-block, when the button has been pressed long
|
|
|
517 |
enough; it simulates a release-press, by evaluating both release
|
|
|
518 |
and press actions."
|
|
76
|
519 |
|
|
|
520 |
pressed ifTrue:[
|
|
133
|
521 |
enableChannel value ifTrue:[
|
|
121
|
522 |
active ifFalse:[
|
|
155
|
523 |
self performAction.
|
|
|
524 |
"/ active := true.
|
|
|
525 |
"/ releaseActionBlock notNil ifTrue:[releaseActionBlock value].
|
|
|
526 |
"/ pressActionBlock notNil ifTrue:[pressActionBlock value].
|
|
|
527 |
"/ active := false.
|
|
121
|
528 |
|
|
|
529 |
autoRepeat ifTrue:[
|
|
|
530 |
Processor addTimedBlock:repeatBlock afterSeconds:repeatDelay
|
|
|
531 |
]
|
|
|
532 |
]
|
|
76
|
533 |
]
|
|
|
534 |
]
|
|
|
535 |
! !
|
|
121
|
536 |
|
|
|
537 |
!ButtonController methodsFor:'initialization'!
|
|
|
538 |
|
|
|
539 |
initialize
|
|
|
540 |
super initialize.
|
|
|
541 |
|
|
133
|
542 |
self enableChannel:(true asValue).
|
|
|
543 |
|
|
121
|
544 |
active := false.
|
|
|
545 |
pressed := false.
|
|
|
546 |
entered := false.
|
|
|
547 |
autoRepeat := false.
|
|
|
548 |
initialDelay := self class defaultInitialDelay.
|
|
|
549 |
repeatDelay := self class defaultRepeatDelay.
|
|
|
550 |
isTriggerOnDown := false.
|
|
|
551 |
isToggle := false.
|
|
|
552 |
! !
|
|
200
|
553 |
|