ProtoMorph
Last updated at 8:20 pm UTC on 7 January 2022
http://lists.squeakfoundation.org/pipermail/squeak-dev/attachments/20030213/a0c164a7/MinimalProtoMorph.1.obj
A ProtoMorph is a kind of minimal Morph object clone obtained by running an initially empty subclass of Object in terms of methods. The methods are added as needed.
ProtoMorph was used as a tool to develop Bricks, initial code below.
It is supposed to work like a Morph object. It initially has no Morph methods. The doesNotUnderstand mechanism is used to copy and compile methods from class Morph as they are needed.
A ProtoMorph object is a sibling of a Morph object.
The original code from 2003
'From Squeak3.4gamma of ''7 January 2003'' [latest update: #5169] on 13 February 2003 at 2:22:56 am'!
Object subclass: #ProtoMorph
instanceVariableNames: 'bounds owner submorphs fullBounds color extension '
classVariableNames: 'EmptyArray '
poolDictionaries: ''
category: 'Morphic-Proto'!
!ProtoMorph methodsFor: 'error handling' stamp: 'tb 2/13/2003 01:40'!
cloneSelector: sel
self class removeSelector: sel.
self class copy: sel from: Morph.
"(ChangeSet allInstances detect: [:ea | ea name = 'Morphic-Changes']) fileOut."
! !
!ProtoMorph methodsFor: 'error handling' stamp: 'tb 2/13/2003 00:40'!
doesNotUnderstand: aMessage
Morph sourceCodeAt: (aMessage selector) ifAbsent: [ super doesNotUnderstand: aMessage].
self cloneSelector: (aMessage selector).
^self perform: (aMessage selector) withArguments: (aMessage arguments).
! !
!ProtoMorph methodsFor: 'genie-processing' stamp: 'tb 2/12/2003 23:21'!
defaultGestureDictionaryOrName
"This method returns the default gesture dictionary name for the instances
of a Morph class. (It's also possible to directly return a dictionary but it's much
more flexible to return the name).
This generic implementation returns the class name if there is a dictionary
exported under this name. If not, it tries the name of the superclass, etc."
| class |
self gestureHandler ~~ self
ifTrue: [^ self gestureHandler defaultGestureDictionaryOrName].
class _ self class.
[class ~= Object and:
[(CRDictionary exportedName: class name asSymbol) isNil]] whileTrue:
[class _ class superclass].
^ (CRDictionary exportedName: class name asSymbol) isNil
ifTrue: [self class name asSymbol]
ifFalse: [class name asSymbol].! !
!ProtoMorph class methodsFor: 'class initialization' stamp: 'tb 2/13/2003 01:26'!
initialize
EmptyArray := #().
self buildSelectorFaults! !
!ProtoMorph class methodsFor: 'instance creation' stamp: 'tb 2/12/2003 22:40'!
new
^ super new initialize! !
!ProtoMorph class methodsFor: 'instance creation' stamp: 'tb 2/12/2003 22:42'!
newBounds: bounds
^ self new privateBounds: bounds! !
!ProtoMorph class methodsFor: 'instance creation' stamp: 'tb 2/12/2003 22:43'!
newBounds: bounds color: color
^ (self new privateBounds: bounds) privateColor: color
! !
!ProtoMorph class methodsFor: 'instance creation' stamp: 'tb 2/12/2003 22:43'!
newSticky
^ self new beSticky! !
!ProtoMorph class methodsFor: 'debugging' stamp: 'tb 2/13/2003 00:45'!
buildSelectorFaults
Morph methodDictionary keys do: [:sel |
((Object methodDictionary includesKey: sel) and:
[(self methodDictionary includesKey: sel) not]) ifTrue:
[
| src header |
header := Morph methodHeaderFor: sel.
src := (header, ' self cloneSelector: ', (sel printString), '. ^self ', header).
self compile: src classified: 'object-overrides'.
]
]
! !
ProtoMorph initialize!
Using the code in Squeak 5.2
The steps below describe some adaptions when working with the code above in Squeak 5.2.
Frist step - File in the slightly modified code
In Squeak 5.2 #defaultGestureDictionaryOrName is no longer called.
So this method has been removed from the code copied in again below.
ProtoMorph has on the instance side
- #cloneSelector
- #doesNotUnderstand
ProtoMorph has on the class side
- #initialize
- #new
- #newBounds:
- #newBounds:color:
'From Squeak3.4gamma of ''7 January 2003'' [latest update: #5169] on 13 February 2003 at 2:22:56 am'!
Object subclass: #ProtoMorph
instanceVariableNames: 'bounds owner submorphs fullBounds color extension '
classVariableNames: 'EmptyArray '
poolDictionaries: ''
category: 'Morphic-Proto'!
!ProtoMorph methodsFor: 'error handling' stamp: 'tb 2/13/2003 01:40'!
cloneSelector: sel
self class removeSelector: sel.
self class copy: sel from: Morph.
"(ChangeSet allInstances detect: [:ea | ea name = 'Morphic-Changes']) fileOut."
! !
!ProtoMorph methodsFor: 'error handling' stamp: 'tb 2/13/2003 00:40'!
doesNotUnderstand: aMessage
Morph sourceCodeAt: (aMessage selector) ifAbsent: [ super doesNotUnderstand: aMessage].
self cloneSelector: (aMessage selector).
^self perform: (aMessage selector) withArguments: (aMessage arguments).
! !
!ProtoMorph class methodsFor: 'class initialization' stamp: 'tb 2/13/2003 01:26'!
initialize
EmptyArray := #().
self buildSelectorFaults! !
!ProtoMorph class methodsFor: 'instance creation' stamp: 'tb 2/12/2003 22:40'!
new
^ super new initialize! !
!ProtoMorph class methodsFor: 'instance creation' stamp: 'tb 2/12/2003 22:42'!
newBounds: bounds
^ self new privateBounds: bounds! !
!ProtoMorph class methodsFor: 'instance creation' stamp: 'tb 2/12/2003 22:43'!
newBounds: bounds color: color
^ (self new privateBounds: bounds) privateColor: color
! !
!ProtoMorph class methodsFor: 'instance creation' stamp: 'tb 2/12/2003 22:43'!
newSticky
^ self new beSticky! !
!ProtoMorph class methodsFor: 'debugging' stamp: 'tb 2/13/2003 00:45'!
buildSelectorFaults
Morph methodDictionary keys do: [:sel |
((Object methodDictionary includesKey: sel) and:
[(self methodDictionary includesKey: sel) not]) ifTrue:
[
| src header |
header := Morph methodHeaderFor: sel.
src := (header, ' self cloneSelector: ', (sel printString), '. ^self ', header).
self compile: src classified: 'object-overrides'.
]
]
! !
ProtoMorph initialize!
2nd step - get methods from class Morph
Execute some Morphic code snippets but for ProtoMorph
ProtoMorph new inspect
and
ProtoMorph new color: Color red.
You will note in the SystemBrowser that the ProtoMorph class now has got a number of methods. But the code snippets will not succeed.
One reason is that the instance variable 'bounds' is nil.
If you follow this up you will note that the #initialize method is missing in ProtoMorph. It was not copied because it did not go through the method copying process as ProtoMorph understands #initialize.
So the #initialize method has to be copied manually from the class Morph.
After adding the #initialize method run
((Morph new extent: 120@100) addMorph: ProtoMorph new) openInHand
Two debugger windows come up but also the result so far, see picture
..... to be continued.
Manually copy method #step
Simplified version of
indicateKeyboardFocus
^ false
on the class side, category 'preferences'
