"
COPYRIGHT (c) 1997 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.
"
Object subclass:#ResourceRetriever
instanceVariableNames:'className resourceOwner selector labelText'
classVariableNames:''
poolDictionaries:''
category:'Interface-Support-UI'
!
!ResourceRetriever class methodsFor:'documentation'!
copyright
"
COPYRIGHT (c) 1997 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
"
This class is used to retrieve resources for a painted interface of
some sort. If the className is specified, then the owner of the resource
is fixed at painting time. If not, then the ApplicationModel which invokes
the painted interface is assumed to be the owner of the resource.
When the retriever is sent the message #value, it sends the message #valueFor:
to the resource owner, to retrive the resource
[author:]
Claus Atzkern
[see also:]
Application
Menu
MenuItem
"
! !
!ResourceRetriever methodsFor:'accessing'!
className
"return the value of the instance variable 'className' (automatically generated)"
^ className!
className:something
"set the class which provides the resources
"
className := something.
resourceOwner := nil.
!
labelText
^ labelText
!
labelText:aText
labelText := aText
!
selector
"return the value of the instance variable 'selector' (automatically generated)"
^ selector!
selector:something
"set the value of the instance variable 'selector' (automatically generated)"
selector := something.
!
value
"returns value assigned to resource or nil
"
|resource|
(resource := self resource) isNil ifTrue:[
^ labelText
].
(labelText notNil and:[resource isImage]) ifTrue:[
^ LabelAndIcon icon:resource string:(Text string:labelText emphasis:#bold)
].
^ resource
! !
!ResourceRetriever methodsFor:'accessing resource'!
findGuiResourcesIn:aResourceContainer
"setup a resource owner
"
className isNil ifTrue:[
resourceOwner := aResourceContainer
].
!
resource
"returns form assigned to resource or nil
"
|img|
selector isNil ifTrue:[
^nil
].
resourceOwner isNil ifTrue:[
( className isNil
or:[(resourceOwner := Smalltalk at:className ifAbsent:nil) isNil]
) ifTrue:[
^ nil
]
].
(resourceOwner respondsTo:#visualFor:) ifTrue:[
(img := resourceOwner visualFor:selector) notNil ifTrue:[
^ img
]
].
^ resourceOwner perform:selector.
! !
!ResourceRetriever methodsFor:'converting'!
fromLiteralArrayEncoding:anArray
"read my values from an encoding.
"
className := anArray at: 2.
selector := anArray at: 3.
anArray size == 4 ifTrue:[
labelText := anArray at:4
].
resourceOwner := nil.
!
literalArrayEncoding
"encode myself as an array, from which a copy of the receiver can be
reconstructed with #decodeAsLiteralArray.
The encoding is:
(#ResourceRetriever className selector)
or if labelText not nil:
(#ResourceRetriever className selector labelText)
"
labelText isNil ifTrue:[
^ Array with:(self class name) with:className with:selector
] ifFalse:[
^ Array with:(self class name) with:className with:selector with:labelText
].
! !
!ResourceRetriever methodsFor:'testing'!
isDefined
"returns true if resource exists
"
selector notNil ifTrue:[
^ (resourceOwner notNil or:[className notNil])
].
^ false
!
notDefined
"returns false if resource is not defined
"
self isDefined ifTrue:[^ false ]
ifFalse:[^ true ]
! !
!ResourceRetriever class methodsFor:'documentation'!
version
^ '$Header$'
! !