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"
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6
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COPYRIGHT (c) 1989 by Claus Gittinger
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72
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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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'From Smalltalk/X, Version:2.10.5 on 14-mar-1995 at 11:02:34 am'!
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SimpleView subclass:#View
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instanceVariableNames:'model aspectMsg changeMsg menuMsg'
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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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View comment:'
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COPYRIGHT (c) 1995 by Claus Gittinger
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All Rights Reserved
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$Header: /cvs/stx/stx/libview/View.st,v 1.42 1995-05-09 00:23:01 claus Exp $
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2
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'!
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!View class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 1989 by Claus Gittinger
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72
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All Rights Reserved
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46
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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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!
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version
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"
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$Header: /cvs/stx/stx/libview/View.st,v 1.42 1995-05-09 00:23:01 claus Exp $
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"
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!
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41
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documentation
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2
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"
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135
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this class adds provisions for views which show or work on a model.
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This functionality used to be in View, but has been extracted into SimpleView and
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this new View class, to take some of the stuff out of views which do not need
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this functionality (i.e. all views which do only geometry management).
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82
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Instances of View are seldom used, most views in the system inherit
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from this class.
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Instance variables:
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model <nil | any> the model (if any)
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aspectMsg <nil | Symbol> the aspect; typically
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dependentViews react on changes
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of this aspect and update their contents.
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changeMsg <nil | Symbol> the changeMessage; typically
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dependentViews send this message to
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the model to tell it about changes.
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menuMsg <nil | Symbol> the menuMessage; typically
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dependentViews send this message to
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the model to ask for a popup menu.
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Some classes allow setting an explicit
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menuHolder and menuPerformer.
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2
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"
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! !
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!View class methodsFor:'instance creation'!
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on:aModel aspect:aspectMsg
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"st-80 style view creation: create a new view, set its model
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and selectors for aspect"
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^ self new
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on:aModel
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aspect:aspectMsg
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!
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on:aModel aspect:aspectMsg change:changeMsg
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"st-80 style view creation: create a new view, set its model
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and selectors for aspect and change"
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^ self new
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on:aModel
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aspect:aspectMsg
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change:changeMsg
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!
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on:aModel aspect:aspectMsg menu:menuMsg
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"st-80 style view creation: create a new view, set its model
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and selectors for aspect and menu"
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^ self new
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on:aModel
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aspect:aspectMsg
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menu:menuMsg
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!
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on:aModel aspect:aspectMsg change:changeMsg menu:menuMsg
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"st-80 style view creation: create a new view, set its model
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and selectors for aspect, change and menu"
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^ self new
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on:aModel
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aspect:aspectMsg
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change:changeMsg
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menu:menuMsg
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!
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model:aModel
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"st-80 style view creation: create a new view and set its model"
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^ self new model:aModel
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! !
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!View class methodsFor:'defaults'!
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defaultAspectMessage
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"subclasses which by default do NOT want to be informed about changed
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models should redefine this to return nil"
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^ #value
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!
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defaultChangeMessage
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"subclasses which by default do NOT want to inform the model
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should redefine this to return nil"
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^ #value:
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! !
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!View methodsFor:'accessing-mvc'!
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sendChangeMessageWith:arg
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"tell the model about a change"
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self sendChangeMessage:changeMsg with:arg
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!
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sendChangeMessage:aSelector with:arg
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"tell the model about a change"
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|n selector|
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"/
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135
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"/ MVC way of doing it:
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"/ if the model is a block, evaluate it, optionally
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"/ passing the arg and the receiver as arguments.
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"/
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"/ otherwise (the common case) send it a changeMsg message
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"/ also with arg and the receiver (depending on the number of arguments
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"/ as defined by the selector).
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"/
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(model notNil and:[aSelector notNil]) ifTrue:[
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n := aSelector numArgs.
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model isBlock ifTrue:[
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n := model numArgs.
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n == 0 ifTrue:[
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selector := #value
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] ifFalse:[
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n == 1 ifTrue:[
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selector := #value:
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] ifFalse:[
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selector := #value:value:
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]
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]
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] ifFalse:[
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selector := aSelector
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].
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n == 0 ifTrue:[
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model perform:selector
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107
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] ifFalse:[
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n == 1 ifTrue:[
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model perform:selector with:arg
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] ifFalse:[
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model perform:selector with:arg with:self
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]
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]
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0
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]
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!
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model
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"return the model, for non-MVC views,
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this is nil or the receiver"
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^ model
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!
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model:aModel
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"set the model"
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model notNil ifTrue:[
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model removeDependent:self
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89
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].
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model := aModel.
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135
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model notNil ifTrue:[
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aModel addDependent:self
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].
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controller notNil ifTrue:[
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controller model:aModel
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]
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!
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controller:aController
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"set the controller"
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super controller:aController.
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controller notNil ifTrue:[
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controller model:model
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0
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223 |
]
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!
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225 |
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135
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on:aModel aspect:aspectSymbol
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"ST-80 compatibility: set model and aspect
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228 |
messages - needs a view which uses these"
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229 |
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|
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aspectMsg := aspectSymbol.
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118
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self model:aModel.
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232 |
!
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233 |
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135
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on:aModel aspect:aspectSymbol menu:menuSymbol
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118
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"ST-80 compatibility: set model, aspect and menu
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236 |
messages - needs a view which uses these"
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237 |
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135
|
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aspectMsg := aspectSymbol.
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239 |
menuMsg := menuSymbol.
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self model:aModel.
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!
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242 |
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140
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on:aModel aspect:aspectSymbol change:changeSymbol
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244 |
"ST-80 compatibility: set model, aspect and change
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messages - needs a view which uses these"
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246 |
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aspectMsg := aspectSymbol.
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248 |
changeMsg := changeSymbol.
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self model:aModel.
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!
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251 |
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135
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on:aModel aspect:aspectSymbol change:changeSymbol menu:menuSymbol
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118
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"ST-80 compatibility: set model, aspect, change and menu
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254 |
messages - needs a view which uses these"
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255 |
|
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135
|
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aspectMsg := aspectSymbol.
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257 |
changeMsg := changeSymbol.
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menuMsg := menuSymbol.
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118
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self model:aModel.
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!
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261 |
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140
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menuMessage:aSymbol
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"ST-80 style menus: If a views menuSymbol is nonNil, it
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264 |
will send it to its model when the middleButton is pressed.
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265 |
That method should return nil or the menu to be shown.
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266 |
This is useful for very dynamic menus, where it does not
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make sense to define an initial menu.
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This is the same as #menu: which was added for ST-80 compatibility."
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menuMsg := aSymbol
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!
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menuMessage
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"Return the symbol sent to the model to aquire the menu"
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^ menuMsg
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!
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135
|
279 |
menu:menuSymbol
|
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118
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"ST-80 style menus: If a views menuSymbol is nonNil, it
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281 |
will send it to its model when the middleButton is pressed.
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282 |
That method should return nil or the menu to be shown.
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283 |
This is useful for very dynamic menus, where it does not
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140
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make sense to define an initial menu.
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285 |
Alias for #menuMessage:, for ST-80 compatibility."
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118
|
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135
|
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menuMsg := menuSymbol
|
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118
|
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!
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289 |
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140
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changeMessage:aSymbol
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291 |
"ST-80 style change notification: If a views changeSymbol is nonNil,
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292 |
it will send it to its model when something changes.
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|
293 |
This is the same as change: which was added for ST-80 compatibility."
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294 |
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|
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changeMsg := aSymbol
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|
296 |
!
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297 |
|
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298 |
changeMessage
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|
299 |
"Return the symbol sent to the model if nonNil when something changes."
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300 |
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301 |
^ changeMsg
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|
302 |
!
|
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303 |
|
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135
|
304 |
change:changeSymbol
|
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118
|
305 |
"ST-80 style change notification: If a views changeSymbol is nonNil,
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140
|
306 |
it will send it to its model when something changes.
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|
307 |
Alias for changeMessage: for ST-80 compatibility."
|
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118
|
308 |
|
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135
|
309 |
changeMsg := changeSymbol
|
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118
|
310 |
!
|
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|
311 |
|
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135
|
312 |
aspect:aspectSymbol
|
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118
|
313 |
"ST-80 style updating: If a views aspectSymbol is nonNil,
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|
314 |
it will respond to changes of this aspect from the model."
|
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|
315 |
|
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135
|
316 |
aspectMsg := aspectSymbol
|
|
0
|
317 |
!
|
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|
318 |
|
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140
|
319 |
aspect
|
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|
320 |
"Return the aspect used with changes from/to the model"
|
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72
|
321 |
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140
|
322 |
^ aspectMsg
|
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118
|
323 |
!
|
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|
324 |
|
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135
|
325 |
aspectMessage
|
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|
326 |
"Return the aspect used with changes from/to the model"
|
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60
|
327 |
|
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135
|
328 |
^ aspectMsg
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140
|
329 |
!
|
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|
330 |
|
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|
331 |
addModelInterfaceTo:aDictionary
|
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|
332 |
"this adds entries for all messages sent to my model
|
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|
333 |
to aDictionary"
|
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|
334 |
|
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|
335 |
aDictionary at:#aspectMessage put:aspectMsg.
|
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|
336 |
aDictionary at:#changeMessage put:changeMsg.
|
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|
337 |
aDictionary at:#menuMessage put:menuMsg.
|
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|
338 |
|
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|
339 |
"
|
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|
340 |
Button new modelInterface
|
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|
341 |
"
|
|
|
342 |
!
|
|
|
343 |
|
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|
344 |
modelInterface
|
|
|
345 |
"this returns a dictionary of messages sent to my model.
|
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|
346 |
It can be used for builders and wrappers to get information
|
|
|
347 |
about the messages sent to my model.
|
|
|
348 |
The returned dictionary contains one entry for each get-Msg,
|
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|
349 |
and the recevier will implement corresponding messages (with a colon)
|
|
|
350 |
to set the message symbol."
|
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|
351 |
|
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|
352 |
|d|
|
|
|
353 |
|
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|
354 |
d := IdentityDictionary new.
|
|
|
355 |
self addModelInterfaceTo:d.
|
|
|
356 |
^ d
|
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|
357 |
|
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|
358 |
"
|
|
|
359 |
Button new modelInterface
|
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|
360 |
Label new modelInterface
|
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|
361 |
"
|
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|
362 |
|
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|
363 |
"
|
|
|
364 |
does the view support setting the menuMessage ?
|
|
|
365 |
|
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|
366 |
SelectionInListView new modelInterface includesKey:#menuMessage
|
|
|
367 |
"
|
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|
368 |
|
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|
369 |
"
|
|
|
370 |
turn off all interaction to the model:
|
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|
371 |
|
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|
372 |
|m v if|
|
|
|
373 |
|
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|
374 |
m := SelectionInList new.
|
|
|
375 |
m list:#('one' 'two' 'tree' 'four') asValue.
|
|
|
376 |
m selection:1 asValue.
|
|
|
377 |
v := SelectionInListView on:m.
|
|
|
378 |
v open.
|
|
|
379 |
v inspect.
|
|
|
380 |
|
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|
381 |
if := v modelInterface.
|
|
|
382 |
if inspect.
|
|
|
383 |
|
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|
384 |
if keysAndValuesDo:[:what :msg |
|
|
|
385 |
v perform:(what , ':') asSymbol with:nil.
|
|
|
386 |
].
|
|
|
387 |
"
|
|
72
|
388 |
! !
|
|
|
389 |
|
|
135
|
390 |
!View methodsFor:'accessing-menus'!
|
|
118
|
391 |
|
|
135
|
392 |
menuHolder
|
|
|
393 |
"who has the menu ?
|
|
|
394 |
By default, its the model if I have one."
|
|
118
|
395 |
|
|
135
|
396 |
model notNil ifTrue:[^ model].
|
|
118
|
397 |
^ self
|
|
|
398 |
!
|
|
|
399 |
|
|
135
|
400 |
menuPerformer
|
|
|
401 |
"who should perform the menu actions ?
|
|
|
402 |
By default, its the model if I have one."
|
|
118
|
403 |
|
|
135
|
404 |
model notNil ifTrue:[^ model].
|
|
|
405 |
^ self
|
|
118
|
406 |
! !
|
|
|
407 |
|
|
|
408 |
!View methodsFor:'initialization'!
|
|
|
409 |
|
|
|
410 |
initialize
|
|
|
411 |
super initialize.
|
|
140
|
412 |
|
|
|
413 |
aspectMsg := self class defaultAspectMessage.
|
|
|
414 |
changeMsg := self class defaultChangeMessage.
|
|
|
415 |
|
|
135
|
416 |
model notNil ifTrue:[
|
|
|
417 |
controller notNil ifTrue:[
|
|
118
|
418 |
controller model:model
|
|
|
419 |
]
|
|
81
|
420 |
].
|
|
118
|
421 |
! !
|
|
|
422 |
|
|
|
423 |
!View methodsFor:'drawing'!
|
|
|
424 |
|
|
|
425 |
redraw
|
|
|
426 |
"redraw myself
|
|
|
427 |
if there is a model, this one shall redraw itself,
|
|
|
428 |
otherwise we cannot do much here - has to be redefined in subclasses"
|
|
|
429 |
|
|
|
430 |
model notNil ifTrue:[
|
|
|
431 |
model update:self
|
|
|
432 |
]
|
|
|
433 |
! !
|
|
|
434 |
|
|
|
435 |
!View methodsFor:'realization'!
|
|
|
436 |
|
|
|
437 |
destroy
|
|
|
438 |
"unrealize & destroy - make me invisible, destroy subviews then
|
|
|
439 |
make me unknown to the device"
|
|
|
440 |
|
|
|
441 |
model notNil ifTrue:[
|
|
|
442 |
model removeDependent:self.
|
|
|
443 |
model := nil.
|
|
|
444 |
].
|
|
|
445 |
super destroy.
|
|
|
446 |
! !
|