"
 COPYRIGHT (c) 1998 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:libwidg2' }"

ScrollableView subclass:#SubCanvas
	instanceVariableNames:'builder spec client clientHolder specHolder clientView
		clientViewIsScrolled lateBuild'
	classVariableNames:''
	poolDictionaries:''
	category:'Views-Basic'
!

!SubCanvas class methodsFor:'documentation'!

copyright
"
 COPYRIGHT (c) 1998 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
"
    a view for a subApplication.

    [author:]
        Claus Atzkern
"

! !

!SubCanvas class methodsFor:'defaults'!

defaultHorizontalScrollable
    ^ false


!

defaultVerticalScrollable
    ^ false


! !

!SubCanvas methodsFor:'accessing'!

builder
    "return the value of the instance variable 'builder' (automatically generated)"

    ^ builder!

client
    "return the value of the instance variable 'client' (automatically generated)"

    ^ client!

client:anApplication spec:aWindowSpecOrSpecSymbol builder:aBuilder
    "release existing components and generate new components from
     the given windowSpec, using the given builder."

    |myApp|

    (client notNil and:[client ~~ anApplication]) ifTrue:[
        client releaseAsSubCanvas.
        client := nil.
    ].

    (builder := aBuilder) isNil ifTrue:[
        builder := anApplication perform:#builder ifNotUnderstood:[UIBuilder new]
    ].

    spec := aWindowSpecOrSpecSymbol.

    "/ check for master application
    (anApplication notNil and:[anApplication masterApplication isNil]) ifTrue:[
        myApp := self application.
        myApp ~~ anApplication ifTrue:[
            anApplication masterApplication:myApp
        ]
    ].

    client := anApplication.
    self rebuild.
    ^ builder
!

makeClientViewScrollable:aBoolean
    |vs|

    aBoolean ~~ clientViewIsScrolled ifTrue:[
        clientView isNil ifTrue:[
            clientView := View new.
        ].
        aBoolean ifTrue:[
            self scrolledView:(vs := ViewScroller new).
            vs scrolledView:clientView.
        ] ifFalse:[
            self scrolledView:clientView.
        ].
        clientViewIsScrolled := aBoolean.
    ]

    "Modified: / 30.1.2000 / 21:36:29 / cg"
!

setClient:anApplicationModel
    "set the client - do NOT rebuild"

    client := anApplicationModel 
!

spec
    "return the value of the instance variable 'spec' (automatically generated)"

    ^ spec!

spec:something
    "set the value of the instance variable 'spec' (automatically generated)"

    spec := something.
    self rebuild.
!

widget
    "ST80 compatibility. 
     I am my own widget"

    ^ self

    "Created: / 10.3.1998 / 16:20:52 / stefan"
! !

!SubCanvas methodsFor:'accessing-channels'!

clientHolder
    ^ clientHolder
!

clientHolder:aValueHolder

    clientHolder notNil ifTrue:[
        clientHolder removeDependent:self
    ].
    (clientHolder := aValueHolder) notNil ifTrue:[
        clientHolder addDependent:self
    ].
    self updateFromChannels
!

specHolder
    ^ specHolder
!

specHolder:aValueHolder

    specHolder notNil ifTrue:[
        specHolder removeDependent:self
    ].
    (specHolder := aValueHolder) notNil ifTrue:[
        specHolder addDependent:self
    ].
    self updateFromChannels
! !

!SubCanvas methodsFor:'building'!

XXrebuild
    "rebuild
    "
    |v subSpec savedView builderClass boundsOrLayout|

    superView isNil ifTrue:[
        lateBuild := true.
        ^ self
    ].

    clientView notNil ifTrue:[
        clientView destroySubViews
    ].

    spec notNil ifTrue:[
        (subSpec := spec) isSymbol ifTrue:[
            client isNil ifTrue:[
                'SubCanvas [warning]: no client - cannot build spec' infoPrintCR.
                ^ self
            ].
            (subSpec := client class interfaceSpecFor:spec) isNil ifTrue:[
                "/ Transcript showCR:'SubCanvas: nil spec'.
                ^ self
            ]
        ].

        builder isNil ifTrue:[
            client isNil ifTrue:[
                builderClass := UIBuilder
            ] ifFalse:[
                builderClass := client builderClass
            ].
            builder := builderClass new.
        ].

        "/ old:
"/         builder buildFromSpec:subSpec in:clientView.

        "/ new (let app know (somehow) that this is a build
        "/ for a subcanvas (i.e. it can redefine the buildSubCanvase-method
        "/:
        savedView := builder window.
        builder window:clientView.
        [
            client buildSubCanvas:subSpec withBuilder:builder.
        ] valueNowOrOnUnwindDo:[
            builder window:savedView.
        ].
        clientViewIsScrolled ifTrue:[
            boundsOrLayout := builder spec window layout.
            boundsOrLayout isNil ifTrue:[
                 boundsOrLayout := builder spec window bounds
            ].
            clientView
                extent:(boundsOrLayout rectangleRelativeTo:self bounds preferred:nil) extent.
        ].

        self realized ifTrue:[
            clientView realizeAllSubViews
        ]
    ]

    "Modified: / 20.6.1998 / 14:29:00 / cg"
!

container:aView
    super container:aView.

    "/ my builder can only build the components, when I have a container
    "/ lateBuild is set, if the spec was set some time ago, when I had no container
    "/ Now, we know where to build the GUI ...
    "/ ... and must hurry up to create the widgets.
    lateBuild == true ifTrue:[
        lateBuild := false.
        self rebuild
    ].
!

rebuild
    "rebuild
    "
    |v subSpec savedView builderClass|

    "/ if the superView is not yet created,
    "/ we MUST delay building... (sigh)
    superView isNil ifTrue:[
        lateBuild := true.
        ^ self
    ].

    clientView notNil ifTrue:[
        clientView destroySubViews
    ].

    spec notNil ifTrue:[
        (subSpec := spec) isSymbol ifTrue:[
            client isNil ifTrue:[
                'SubCanvas [warning]: no client - cannot build spec' infoPrintCR.
                ^ self
            ].
            (subSpec := client class interfaceSpecFor:spec) isNil ifTrue:[
                "/ Transcript showCR:'SubCanvas: nil spec'.
                ^ self
            ]
        ].
        subSpec isArray ifTrue:[
            subSpec := subSpec decodeAsLiteralArray
        ].

        builder isNil ifTrue:[
            client isNil ifTrue:[
                builderClass := UIBuilder
            ] ifFalse:[
                builderClass := client builderClass
            ].
            builder := builderClass new.
        ].

        "/ old:
        "/  builder buildFromSpec:subSpec in:clientView.

        "/ new (let app know (somehow) that this is a build
        "/ for a subcanvas (i.e. it can redefine the buildSubCanvas-method):

        savedView := builder window.
        builder window:clientView.
        [
            client buildSubCanvas:subSpec withBuilder:builder.
        ] valueNowOrOnUnwindDo:[
            savedView notNil ifTrue:[
                builder window:savedView.
            ]
        ].
        clientViewIsScrolled ifTrue:[
            clientView extent:((subSpec window layout) ? (subSpec window bounds)) extent.
        ].

        self realized ifTrue:[
            clientView realizeAllSubViews
        ].
    ]

    "Modified: / 30.1.2000 / 21:36:40 / cg"
!

releaseAllComponents
    clientView destroySubViews.
    builder := nil.
    spec    := nil.
    client  := nil.

    "Modified: / 31.1.2000 / 16:56:14 / cg"
! !

!SubCanvas methodsFor:'change & update'!

update:something with:aParameter from:changedObject
    "one of my models changed its value
    "
    (changedObject == clientHolder or:[changedObject == specHolder]) ifTrue:[
        self updateFromChannels
    ] ifFalse:[
        super update:something with:aParameter from:changedObject.
    ]

!

updateFromChannels
    "update canvas from channel
    "
    |client spec|

    clientHolder isNil ifTrue:[
        client := self application
    ] ifFalse:[
        client := clientHolder value
    ].

    specHolder isNil ifTrue:[
        spec := #windowSpec
    ] ifFalse:[
        spec := specHolder value
    ].
    (client notNil and:[spec notNil]) ifTrue:[
        self client:client spec:spec
    ] ifFalse:[
"/        spec notNil ifTrue:[
"/            self halt:'spec but no app'.
"/        ].
        self client:nil
    ]

    "Modified: / 5.8.1999 / 13:35:26 / cg"
! !

!SubCanvas methodsFor:'initialization'!

destroy
    client notNil ifTrue:[
        client == self application ifTrue:[
            client releaseAsSubCanvas.
        ] ifFalse:[
            client release
        ].
    ].

    clientHolder notNil ifTrue:[
        clientHolder removeDependent:self.
        clientHolder := nil.
    ].
    specHolder notNil ifTrue:[
        specHolder removeDependent:self.
        specHolder := nil.
    ].
    super destroy.

    "Modified: / 13.2.2000 / 23:31:12 / cg"
!

initialize

    super initialize.
    self scrolledView:(clientView := View new).
    clientViewIsScrolled := false.

    spec := #windowSpec.

    "Modified: / 31.1.2000 / 16:56:31 / cg"
! !

!SubCanvas methodsFor:'layout'!

usedScrolledViewHMarginWhenHasV:hasV andHasH:hasH
    "return the horizontal margin around (outer margin).
     Redefined to avoid margin when no scrollers are present"

    ^ (hasV or:[hasH]) ifTrue:[scrolledViewHMargin] ifFalse:[0]


!

usedScrolledViewVMarginWhenHasV:hasV andHasH:hasH
    "return the horizontal margin around (outer margin).
     Redefined to avoid margin when no scrollers are present"

    ^ (hasV or:[hasH]) ifTrue:[scrolledViewVMargin] ifFalse:[0]


! !

!SubCanvas methodsFor:'queries'!

application
    "return the application, under which this view was opened,
    "

    client notNil ifTrue:[
        ^ client
    ].
    ^ super application

! !

!SubCanvas class methodsFor:'documentation'!

version
    ^ '$Header: /cvs/stx/stx/libwidg2/SubCanvas.st,v 1.28 2000-09-28 18:37:23 cg Exp $'
! !