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"
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COPYRIGHT (c) 1997 by eXept Software AG / 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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"{ Package: 'stx:libview' }"
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Object subclass:#GraphicsDevice
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instanceVariableNames:'displayId eventListeners'
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classVariableNames:''
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poolDictionaries:''
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category:'Interface-Graphics'
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!
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!GraphicsDevice class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 1997 by eXept Software AG / 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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this abstract class was inserted to provide a home for ST-80 classes
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(previously, DeviceWorkstation was directly under Object).
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In ST/X, this is mostly dummy.
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[instance variables:]
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displayId <Handle> the device handle
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[see also:]
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DeviceWorkstation XWorkstation
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[author:]
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Claus Gittinger
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"
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! !
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!GraphicsDevice methodsFor:'accessing'!
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addEventListener:aListener
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"add a local eventListener (with new protocol - #processEvent:)
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This one gets a chance to intercept all events for this device"
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eventListeners isNil ifTrue:[
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eventListeners := OrderedCollection new:2
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].
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eventListeners add:aListener
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!
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removeEventListener:aListener
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"remove a local eventListener (with new protocol - #processEvent:)"
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eventListeners notNil ifTrue:[
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eventListeners removeIdentical:aListener ifAbsent:nil
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].
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! !
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!GraphicsDevice methodsFor:'event processing'!
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notifyEventListenersAbout:anEvent
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"notify all eventHandlers about an incoming event.
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If any returns true, it is assumed to be eaten by the handler and not
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enqueued (i.e. not passed to the windowGroup process)"
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|anyListenerReturnedTrue|
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anyListenerReturnedTrue := false.
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"/ local listeners ...
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eventListeners notNil ifTrue:[
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eventListeners do:[:aListener |
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anyListenerReturnedTrue := anyListenerReturnedTrue |
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(aListener processEvent:anEvent)
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]
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].
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^ anyListenerReturnedTrue.
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! !
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!GraphicsDevice class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libview/GraphicsDevice.st,v 1.4 2000-05-17 13:59:53 stefan Exp $'
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! !
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