"

 COPYRIGHT (c) 1999 by eXept Software AG

              All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

"{ Package: 'stx:libview2' }"

TopView subclass:#ExternalTopView

	instanceVariableNames:'windowClosedPollProcess'

	classVariableNames:''

	poolDictionaries:''

	category:'Views-Basic'

!

!ExternalTopView class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1999 by eXept Software AG

              All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

!

documentation

"

    Represents a view as created by some other application.

    This is a support-class to allow ST/X views to be created

    inside other applications.

    A simple demoApplication is found in goodies/stxInExternalWindow

    (which uses Demos::PlayInAlienWindow as a startup anchor)

    [author:]

        Claus Gittinger (cg@exept.de)

    [see also:]

    [instance variables:]

        none added here

    [class variables:]

        none added here

"

! !

!ExternalTopView class methodsFor:'instance creation'!

newWithID:anAlienWindowID

    "create and return a new externalTopView - the windowID

     as passed in must be from an alien programs view"

    ^ self new setWindowID:anAlienWindowID

! !

!ExternalTopView methodsFor:'private'!

alienViewHasBeenDestroyed

    self sensor notNil ifTrue:[

        self sensor destroyedView:self

    ] ifFalse:[

        self destroyed

    ]

!

checkWindowStillAlive

    "check for a destroyed topView 

     (must poll, since we do not get any events from X for the alien topView)"

    |prevHandler stillAlive prevErrorPrintingFlag|

    prevErrorPrintingFlag := device class errorPrinting.

    device class errorPrinting:true.

    drawableId notNil ifTrue:[

        stillAlive := device isValidWindowId:drawableId.

    ] ifFalse:[

        stillAlive := false

    ].

    device flush.

    device class errorPrinting:prevErrorPrintingFlag.

    ^ stillAlive.

!

checkWindowStillAliveLoop

    [self checkWindowStillAlive] whileTrue:[

        Delay waitForSeconds:0.5.

    ].

    self alienViewHasBeenDestroyed

!

startWindowClosedPollProcess

    windowClosedPollProcess isNil ifTrue:[

        windowClosedPollProcess := 

            [ 

                [

                    self checkWindowStillAliveLoop 

                ] valueNowOrOnUnwindDo:[

                    windowClosedPollProcess := nil.

                ]

            ] fork.

    ].

!

stopWindowClosedPollProcess

    windowClosedPollProcess notNil ifTrue:[

        windowClosedPollProcess terminate.

        windowClosedPollProcess waitUntilTerminated

    ].

! !

!ExternalTopView methodsFor:'private accessing'!

setWindowID:aWindowID

    drawableId := aWindowID.

    realized := shown := true.

! !

!ExternalTopView methodsFor:'queries'!

isExternalTopView

    "return true, if this is an external topView - always true here"

    ^ true

! !

!ExternalTopView methodsFor:'redefined'!

destroyView

    "never destroyed by ST/X - instead, the view is under

     control of the host application ..."

    self stopWindowClosedPollProcess.

    realized := false.

    drawableId := nil.

!

open

    "redefined to start a watch timeout for closed windows;

     this is required, since we wont get any closeRequest event for

     external windows (as all of its events are handled by the alien

     application)"

    super open.

    "/ self checkWindowStillAlive

    self startWindowClosedPollProcess.

!

unmap

    "redefined as a noop;

     ExternalTopViews are never unmapped by ST/X - instead, the view is under

     control of the host application ..."

! !

!ExternalTopView methodsFor:'special'!

becomeParentOf:anSTXWindow

    "add myself to the windowGroup of anSTXWindow ...

     and reparent anSTXWindow to be the (only) child of myself"

    self old_becomeParentOf:anSTXWindow

!

new_becomeParentOf:anSTXWindow

    "add myself to the windowGroup of anSTXWindow ...

     and reparent anSTXWindow to be the (only) child of myself"

    |wg oldTopView retryCount deviceErrorOccured|

    anSTXWindow borderWidth:0. anSTXWindow forceBorderWidth.

    self borderWidth:0.        self forceBorderWidth.

    self borderColor:Color red.

    anSTXWindow createWithAllSubViews.

    oldTopView := anSTXWindow topView.

    wg := anSTXWindow windowGroup.

    wg notNil ifTrue:[

        windowGroup notNil ifTrue:[

            windowGroup removeTopView:self.

        ].

        wg addTopView:self.

        windowGroup := wg.

    ].

    oldTopView == anSTXWindow ifTrue:[

        oldTopView container:self.

    ].

    self open. "/ not really an open; however it starts its event handler

    wg isNil ifTrue:[

        oldTopView windowGroup:self windowGroup.

    ] ifFalse:[

        windowGroup ~~ anSTXWindow windowGroup ifTrue:[

            self halt:'possible inconsistency ?'

        ].

    ].

"/'childID: ' print. anSTXWindow id displayString printCR.

"/'parentID: ' print. self id displayString printCR.

    self addSubView:anSTXWindow.

 self checkWindowStillAlive ifFalse:[ Transcript showCR:'x1'. ^ true].

    anSTXWindow device 

        reparentWindow:anSTXWindow id

        to:self id.

    anSTXWindow device unBuffered.

    retryCount := 0.

    deviceErrorOccured := false.

    [

        GLXWorkstation deviceErrorSignal handle:[:ex|

          'DeviceErrorSignal raised in becomeParentOf: ' printNL.

           deviceErrorOccured := true.

"/          (Delay waitForSeconds: 1).

"/          retryCount := retryCount + 1.

"/          retryCount > 5 ifTrue:[

"/              ex proceed

"/          ].

          ex proceed

        ] do:[

            deviceErrorOccured := false.

            anSTXWindow enableEvent:#structureNotify.

        ].

    ] ensure:[

        anSTXWindow device buffered.

    ].

    deviceErrorOccured ifTrue:[^false].

 self checkWindowStillAlive ifFalse:[ Transcript showCR:'x2'. ^ true].

    anSTXWindow realize.

    anSTXWindow map.

    ^true

"/    wg notNil ifTrue:[

"/        wg removeView:oldTopView.

"/        wg addView:oldTopView.

"/    ].

"/    anSTXWindow origin:0.0 @ 0.0 corner:1.0 @ 1.0.

!

old_becomeParentOf:anSTXWindow

    "add myself to the windowGroup of anSTXWindow ...

     and reparent anSTXWindow to be the (only) child of myself"

    |wg oldTopView|

    anSTXWindow createWithAllSubViews.

    oldTopView := anSTXWindow topView.

    wg := anSTXWindow windowGroup.

    wg notNil ifTrue:[

        wg addTopView:self.

    ].

    oldTopView == anSTXWindow ifTrue:[

        oldTopView setContainer:self.

    ].

    self open. "/ not really an open; however it starts its event handler

    wg isNil ifTrue:[

        oldTopView windowGroup:self windowGroup.

    ].

    anSTXWindow device 

        reparentWindow:anSTXWindow id

        to:self id.

    self addSubView:anSTXWindow.

    anSTXWindow enableEvent:#structureNotify.

    anSTXWindow realize.

    anSTXWindow map.

    wg notNil ifTrue:[

        wg removeView:oldTopView.

        wg addView:oldTopView.

    ].

    anSTXWindow origin:0.0 @ 0.0 corner:1.0 @ 1.0.

! !

!ExternalTopView class methodsFor:'documentation'!

version

! !