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"
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COPYRIGHT (c) 1988 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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PseudoView subclass:#DisplayRootView
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instanceVariableNames:''
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classVariableNames:''
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poolDictionaries:''
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category:'Views-Basic'
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!
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DisplayRootView comment:'
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COPYRIGHT (c) 1988 by Claus Gittinger
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All Rights Reserved
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this class describes Xs rootWindow (which is the background window and
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must be used for drawing outside of Views i.e. for dragging between Views)
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$Header: /cvs/stx/stx/libview/DisplayRootView.st,v 1.5 1994-01-08 17:11:21 claus Exp $
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written spring/summer 89 by claus
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'!
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Smalltalk at:#RootView put:nil!
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!DisplayRootView class methodsFor:'initialization'!
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initialize
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Display isNil ifTrue:[
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Workstation initialize
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].
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super initialize
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! !
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!DisplayRootView class methodsFor:'instance creation'!
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new
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"since there is only one RootView - catch new"
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RootView isNil ifTrue:[
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RootView := super new
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].
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^ RootView
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! !
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!DisplayRootView methodsFor:'initialization'!
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initialize
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super initialize.
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width := device width.
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height := device height.
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realized := true.
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drawableId := device rootWindowFor:self
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!
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reinitialize
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"reinit after snapin"
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width := device width.
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height := device height.
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drawableId := device rootWindowFor:self.
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gcId := nil.
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! !
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!DisplayRootView methodsFor:'accessing'!
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name
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^ 'RootWindow'
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!
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controller
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^ nil
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!
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sensor
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^ nil
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! !
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!DisplayRootView methodsFor:'queries'!
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canDrop:anObjectOrCollection
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"return true, if anObjectOrCollection can be
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dropped in the receiver. This method should be
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redefined in views which can take objects"
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^ false
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!
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isWindowManagerRunning
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"answer true, if a window manager is currently running.
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This is done by performing an action (enabling button events of
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root window), which will fail if a window manager is running."
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|errorOccured|
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errorOccured := false.
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device class deviceErrorSignal handle:[:ex |
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errorOccured := true.
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ex return
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] do:[
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self enableButtonEvents.
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device synchronizeOutput.
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].
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^ errorOccured
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"RootView isWindowManagerRunning"
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! !
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