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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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Object subclass:#EventListener
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instanceVariableNames:''
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classVariableNames:''
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poolDictionaries:''
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category:'Interface-Support'
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!
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!EventListener 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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98
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abstract class for event listeners. EventListeners can be used to intercept
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incoming events (keyboard & mouse) directly from a sensor, or even
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for a complete display device.
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One application is the automatic help, which tracks entering/leaving
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views, to popup some help message. See concrete code in ActiveHelp.
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For each intercepted event, a corresponding method is called for in instances
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of myself - these should return true, if the event is to be ignored (i.e.
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assumed to be processed and consumed by the reader, or false, if the normal
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event procedure should be performed. Since this is an abstract class,
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all of my intercept methods return false. They are meant to be redefined
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in concrete subclasses.
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"
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! !
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!EventListener methodsFor:'events'!
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buttonMotion:state x:x y:y view:aView
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^ false
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!
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buttonMultiPress:button x:x y:y view:aView
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^ false
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!
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buttonPress:button x:x y:y view:aView
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^ false
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!
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buttonRelease:button x:x y:y view:aView
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^ false
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!
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buttonShiftPress:button x:x y:y view:aView
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^ false
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!
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keyPress:key x:x y:y view:aView
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^ false
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!
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keyRelease:key x:x y:y view:aView
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^ false
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!
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pointerEnter:state x:x y:y view:view
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^ false
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!
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pointerLeave:state view:view
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^ false
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! !
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!EventListener methodsFor:'listen'!
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listen
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"install myself as listener"
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WindowSensor eventListener:self
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"
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|listener|
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listener := EventListener new.
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listener listen.
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(Delay forSeconds:20) wait.
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listener unlisten
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"
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!
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unlisten
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"uninstall myself as listener"
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WindowSensor eventListener:nil
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! !
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!EventListener class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libview2/EventListener.st,v 1.8 1995-11-23 17:45:14 cg Exp $'
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! !
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