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"
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COPYRIGHT (c) 1993 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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Object subclass:#WindowGroup
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instanceVariableNames:'views topViews myProcess mySensor'
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classVariableNames:'ActiveGroup'
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poolDictionaries:''
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category:'Interface-Support'
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!
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!WindowGroup class methodsFor:'instance creation'!
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new
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"create and return a new WindowGroup object"
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^ self basicNew initialize
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! !
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!WindowGroup class methodsFor:'accessing'!
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activeGroup
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"return the currently active windowGroup"
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^ ActiveGroup
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! !
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!WindowGroup methodsFor:'accessing'!
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sensor
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"return the windowGroups sensor"
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^ mySensor
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!
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addView:aView
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"add aView to the windowGroup"
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views isNil ifTrue:[
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views := OrderedCollection new.
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].
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views add:aView
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!
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removeView:aView
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"remove aView from the windowGroup;
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if this was the last view in this group,
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also shut down the corresponding process"
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views notNil ifTrue:[
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views remove:aView ifAbsent:[].
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views isEmpty ifTrue:[
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views := nil
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]
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].
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topViews notNil ifTrue:[
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topViews remove:aView ifAbsent:[].
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topViews isEmpty ifTrue:[
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topViews := nil
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]
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].
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(views isNil and:[topViews isNil]) ifTrue:[
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views := nil.
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topViews := nil.
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myProcess notNil ifTrue:[
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myProcess terminate.
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myProcess := nil
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]
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].
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mySensor eventSemaphore signal
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!
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views
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"return the views accociated to this windowGroup"
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^ views
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!
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process
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"return the windowGroups process"
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^ myProcess
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!
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sensor:aSensor
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"set the windowGroups sensor"
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mySensor := aSensor
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!
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addTopView:aView
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topViews isNil ifTrue:[
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topViews := OrderedCollection new.
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].
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topViews add:aView
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! !
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!WindowGroup methodsFor:'event handling'!
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processEvent
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"process a single event from either the damage- or user input queues"
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|damage event view rect|
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ActiveGroup := self.
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[mySensor hasDamage] whileTrue:[
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damage := mySensor nextDamage.
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view := damage at:1.
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rect := damage at:2.
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view exposeX:rect left y:rect top width:rect width height:rect height
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].
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[mySensor hasEvents] whileTrue:[
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event := mySensor nextEvent.
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event sendEvent
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]
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!
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eventLoop
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"loop executed by windowGroup process;
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wait-for and process events forever"
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self eventLoopWhile:[true]
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!
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eventLoopWhile:aBlock
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"wait-for and process events while aBlock evaluates to true."
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aBlock whileTrue:[
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mySensor eventSemaphore wait.
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self processEvent
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]
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! !
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!WindowGroup methodsFor:'activation / deactivation'!
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startup
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"startup the window-group;
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this creates a new window group process, which
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does the event processing."
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|nm|
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myProcess isNil ifTrue:[
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myProcess := [
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self eventLoop
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] forkAt:Processor userSchedulingPriority.
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(topViews notNil and:[topViews isEmpty not]) ifTrue:[
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"give the handler process a user friendly name"
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nm := topViews first iconLabel.
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nm isNil ifTrue:[
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nm := topViews first name.
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nm isNil ifTrue:[
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nm := topViews first label.
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]
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].
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myProcess name:(topViews first name)
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] ifFalse:[
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myProcess name:'window handler'.
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].
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"when the process dies, we have to close-down
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the views as well"
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myProcess exitAction:[self closeDownViews]
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]
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!
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closeDownViews
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"destroy all views associated to this window group"
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topViews notNil ifTrue:[
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topViews do:[:aTopView | aTopView destroy]
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].
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views := nil.
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topViews := nil.
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!
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shutdown
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"shutdow the window group; close all views and
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terminate process"
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self closeDownViews.
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myProcess notNil ifTrue:[
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myProcess terminate.
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myProcess := nil
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]
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! !
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!WindowGroup methodsFor:'initialization'!
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reinitialize
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"throw away old (zombie) process"
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myProcess := nil.
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"throw away old events"
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self initialize
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!
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initialize
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"setup the windowgroup, by creating a new sensor
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and an event semaphore"
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mySensor := WindowSensor new.
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mySensor eventSemaphore:Semaphore new
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! !
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!WindowGroup methodsFor:'printing'!
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printString
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"return a printed representation;
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just for more user friendlyness, add name of process."
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myProcess isNil ifTrue:[^ super printString].
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^ 'WindowGroup(' , myProcess nameOrId , ')'
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! !
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