SynchronousWindowSensor.st
author Claus Gittinger <cg@exept.de>
Tue, 19 Aug 1997 17:28:51 +0200
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break non-windowGroup expose-poll loop after a while (10 seconds) to avoid blocking forever.
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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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WindowSensor subclass:#SynchronousWindowSensor
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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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!SynchronousWindowSensor 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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    in contrast to a regular windowSensor, instances of SynchronousWindowSensor
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    do NOT put events into a queue and do NOT wakeup any windowGroup process.
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    Instead, the underlying view is notified synchronously (via a message send)
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    about the event.
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    These are used for only one single situation: 
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        when a modal debugger is open
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    (i.e. one that is debugging the scheduler or event-dispatcher).
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    This debuggers windowGroup is augmented with a synchronous Sensor, in order
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    to prevent the event handling code from suspending any process 
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    (you cannot suspend the scheduler; you should not suspend the event dispatcher).
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    This is pretty tricky and magic - you dont have to understand this.
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    (consider this system internal code)
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    These sensors are not used with regular views.
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8758d0c9933e documentation
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    [author:]
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        Claus Gittinger
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"
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! !
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!SynchronousWindowSensor methodsFor:'event handling'!
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addDamage:aRectangle view:aView wakeup:doWakeup
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    "forward as an expose for some view"
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    WindowEvent
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        sendEvent:#exposeX:y:width:height:
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        arguments:(Array with:aRectangle left 
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                         with:aRectangle top 
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                         with:aRectangle width
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                         with:aRectangle height)
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        view:aView
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    "Modified: 29.1.1997 / 20:40:52 / cg"
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!
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buttonMotion:button x:x y:y view:aView
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    "forward a button-motion for some view"
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    WindowEvent
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        sendEvent:#buttonMotion:x:y:
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        arguments:(Array with:button with:x with:y)
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        view:aView
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    "Created: 24.11.1995 / 19:14:02 / cg"
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!
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buttonMultiPress:button x:x y:y view:aView
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    "forward a button-multi-press event for some view"
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    WindowEvent
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        sendEvent:#buttonMultiPress:x:y:
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        arguments:(Array with:button with:x with:y)
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        view:aView
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    "Created: 24.11.1995 / 19:14:14 / cg"
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!
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buttonPress:button x:x y:y view:aView
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    "forward a button-press event for some view"
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    WindowEvent
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        sendEvent:#buttonPress:x:y:
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        arguments:(Array with:button with:x with:y)
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        view:aView
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    "Created: 24.11.1995 / 19:14:25 / cg"
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!
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buttonRelease:button x:x y:y view:aView
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    "forward a button-release event for some view"
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    WindowEvent
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        sendEvent:#buttonRelease:x:y:
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        arguments:(Array with:button with:x with:y)
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        view:aView
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    "Created: 24.11.1995 / 19:14:36 / cg"
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!
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configureX:x y:y width:w height:h view:aView
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    "forward a configure for some view"
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    aView configureX:x y:y width:w height:h
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    "Created: 24.11.1995 / 19:14:59 / cg"
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!
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coveredBy:otherView view:aView
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    "forward a covered for some view"
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    aView coveredBy:otherView
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    "Created: 24.11.1995 / 19:15:11 / cg"
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!
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destroyedView:aView
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    "forward a destroyed event for some view"
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    aView destroyed
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    "Created: 24.11.1995 / 19:15:22 / cg"
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!
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exposeX:x y:y width:w height:h view:aView
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    "forward an expose for some view"
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    WindowEvent
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        sendEvent:#exposeX:y:width:height:
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        arguments:(Array with:x with:y with:w with:h)
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        view:aView
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    "Created: 24.11.1995 / 19:15:54 / cg"
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    "Modified: 29.1.1997 / 20:40:58 / cg"
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!
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focusInView:aView
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    "forward a focusIn event for some view"
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    WindowEvent
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        sendEvent:#focusIn
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        arguments:nil
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        view:aView
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    "Created: 24.11.1995 / 19:16:11 / cg"
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!
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focusOutView:aView 
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    "forward a focusOut event for some view"
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    WindowEvent
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        sendEvent:#focusOut
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        arguments:nil
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        view:aView
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    "Created: 24.11.1995 / 19:16:24 / cg"
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!
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graphicsExposeX:x y:y width:w height:h final:final view:aView
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    "forward a graphic expose for some view"
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    "/ this is a possible response to a scroll operation
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    "/ (if an expose is pending)
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    final ifTrue:[
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        (catchExpose includes:aView) ifTrue:[
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            gotExpose add:aView.
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        ]
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    ].
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264
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    WindowEvent
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        sendEvent:#graphicsExposeX:y:width:height:final:
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        arguments:(Array with:x with:y with:w with:h with:final)
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        view:aView
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    "Created: 24.11.1995 / 19:16:38 / cg"
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    "Modified: 29.1.1997 / 20:46:15 / cg"
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!
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keyPress:untranslatedKey x:x y:y view:aView
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    "forward a key-press event for some view"
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    |xlatedKey|
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    self key:untranslatedKey state:true. 
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    xlatedKey := aView graphicsDevice translateKey:untranslatedKey.
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    xlatedKey notNil ifTrue:[
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        WindowEvent
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          sendEvent:#keyPress:x:y:
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          arguments:(Array with:xlatedKey with:x with:y)
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          view:aView
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    ]
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    "Created: 24.11.1995 / 19:17:23 / cg"
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    "Modified: 28.5.1996 / 20:25:23 / cg"
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!
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keyRelease:untranslatedKey x:x y:y view:aView
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    "forward a key-release event for some view"
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    |xlatedKey|
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    self key:untranslatedKey state:false. 
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    xlatedKey := aView graphicsDevice translateKey:untranslatedKey.
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    xlatedKey notNil ifTrue:[
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        WindowEvent
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            sendEvent:#keyRelease:x:y:
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            arguments:(Array with:xlatedKey with:x with:y)
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            view:aView
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    ]
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    "Created: 24.11.1995 / 19:17:50 / cg"
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    "Modified: 28.5.1996 / 20:25:25 / cg"
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!
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mappedView:aView
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    "forward a mapped event for some view"
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    aView mapped
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    "Created: 24.11.1995 / 19:18:01 / cg"
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!
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noExposeView:aView
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    "forward a noExpose event for some view"
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    catchExpose isNil ifTrue:[
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        'SWSensor [info]: noExpose but not catching' infoPrintCR.
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    ].
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    (catchExpose includes:aView) ifTrue:[
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        gotExpose add:aView.
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        catchExpose remove:aView.
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    ].
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    aView noExpose.
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    "Created: 24.11.1995 / 19:18:10 / cg"
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    "Modified: 29.1.1997 / 20:46:47 / cg"
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!
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pointerEnter:buttonState x:x y:y view:aView
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    "forward a pointer enter for some view"
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    WindowEvent
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        sendEvent:#pointerEnter:x:y:
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        arguments:(Array with:buttonState with:x with:y)
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        view:aView
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    "Created: 24.11.1995 / 19:18:20 / cg"
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!
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pointerLeave:buttonState view:aView
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    "forward a pointer leave for some view"
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    WindowEvent
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        sendEvent:#pointerLeave:
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        arguments:(Array with:buttonState)
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        view:aView
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    "Created: 24.11.1995 / 19:18:30 / cg"
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!
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saveAndTerminateView:aView
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    "forward a saveAndTerminate event for some view"
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    aView saveAndTerminate
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    "Created: 24.11.1995 / 19:18:38 / cg"
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!
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terminateView:aView
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    "forward a terminate event for some view"
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    aView terminate
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    "Created: 24.11.1995 / 19:18:48 / cg"
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!
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unmappedView:aView
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    "forward an unmapped event for some view"
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    aView unmapped
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    "Created: 24.11.1995 / 19:18:59 / cg"
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! !
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!SynchronousWindowSensor methodsFor:'specials'!
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catchExposeFor:aView
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    "start catching noExpose events (must be done BEFORE a bitblt)."
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    catchExpose notEmpty ifTrue:[
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        'SWSensor [warning]: already catching in catchExpose' errorPrintCR.
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    ].
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    gotOtherEvent remove:aView ifAbsent:nil.
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    gotExpose remove:aView ifAbsent:nil.
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    catchExpose add:aView.
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    "Modified: 29.1.1997 / 20:43:44 / cg"
264
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!
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waitForExposeFor:aView
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    "wait until a graphicsExpose or a noExpose arrives (after a bitblt)."
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    |device windowId stopPoll endPollTime|
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    device := aView graphicsDevice.
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    "/ this is only needed for X ...
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    device scrollsAsynchronous ifTrue:[
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        windowId := aView id.
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   334
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        "/
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        "/ cannot suspend, I am a synchronous-modal sensor
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        "/ must poll for the event
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        "/
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        endPollTime := AbsoluteTime now addSeconds:10.
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        stopPoll := false.
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        [(gotExpose includes:aView) or:[stopPoll]] whileFalse:[
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            (device exposeEventPendingFor:windowId withSync:true) ifTrue:[
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                device dispatchExposeEventFor:windowId.
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            ].
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            stopPoll := (AbsoluteTime now > endPollTime).
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            Processor yield.
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        ].
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   349
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        stopPoll ifTrue:[
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            'SyncWindowSensor [warning]: lost expose event' errorPrintCR.
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        ]
264
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    ].
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    catchExpose remove:aView ifAbsent:nil.
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    gotExpose remove:aView ifAbsent:nil.
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    "Modified: 19.8.1997 / 17:25:09 / cg"
264
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! !
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!SynchronousWindowSensor class methodsFor:'documentation'!
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version
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    ^ '$Header: /cvs/stx/stx/libview/SynchronousWindowSensor.st,v 1.15 1997-08-19 15:28:51 cg Exp $'
615
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   365
! !