"

 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.

"

ScrollableView subclass:#SubCanvas

	instanceVariableNames:'builder spec client clientHolder specHolder clientView

		clientViewIsScrolled'

	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 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:anApplicationModel

    "release existing components and generate new components from

     the applications windowSpec."

    ^ self client:anApplicationModel spec:#windowSpec

!

client:anApplication spec:aWindowSpecOrSelector

    "release existing components and generate new components from

     the applications windowSpec."

    |aBuilder|

    (anApplication notNil and:[anApplication respondsTo:#builder]) ifTrue:[

        aBuilder := anApplication builder

    ] ifFalse:[

        aBuilder := UIBuilder new

    ].

  ^ self client:anApplication spec:aWindowSpecOrSelector builder:aBuilder

!

client:anApplication spec:aWindowSpecOrSpecSymbol builder:aBuilder

    "release existing components and generate new components from

     the given windowSpec, using the given builder."

    builder  := aBuilder.

    spec     := aWindowSpecOrSpecSymbol.

    "/ check for master application

    (anApplication notNil and:[anApplication masterApplication isNil]) ifTrue:[

        client := nil.

        client := self application.

        client ~~ anApplication ifTrue:[

            anApplication masterApplication:client

        ]

    ].

    client := anApplication.

    self rebuild.

  ^ builder

!

makeClientViewScrollable:aBoolean

    |vs|

    aBoolean ~~ clientViewIsScrolled ifTrue:[

        clientView := View new.

        aBoolean ifTrue:[

            self scrolledView:(vs := ViewScroller new).

            vs scrolledView:clientView.

        ] ifFalse:[

            self scrolledView:clientView.

        ].

        clientViewIsScrolled := aBoolean.

    ]

!

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'!

rebuild

    "rebuild

    "

    |v subSpec savedView builderClass|

    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.

        builder window:savedView.

        clientViewIsScrolled ifTrue:[

            clientView

                extent:(builder spec window layout rectangleRelativeTo:self bounds preferred:nil) extent.

        ].

        self realized ifTrue:[

            clientView realizeAllSubViews

        ]

    ]

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

!

releaseAllComponents

    clientView destroySubViews.

    builder := nil.

    spec    := nil.

    client  := nil.

! !

!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:[

        self client:nil

    ]

! !

!SubCanvas methodsFor:'initialization'!

destroy

    clientHolder notNil ifTrue:[

        clientHolder removeDependent:self.

        clientHolder := nil.

    ].

    specHolder notNil ifTrue:[

        specHolder removeDependent:self.

        specHolder := nil.

    ].

    super destroy.

!

initialize

    super initialize.

    self scrolledView:(clientView := View new).

    clientViewIsScrolled := false.

    spec := #windowSpec.

! !

!SubCanvas methodsFor:'queries'!

application

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

    "

    client notNil ifTrue:[

        ^ client

    ].

    ^ super application

! !

!SubCanvas class methodsFor:'documentation'!

version

! !