[squeak-dev] The Trunk: Tools-mt.1074.mcz

Marcel Taeumel marcel.taeumel at hpi.de
Mon Nov 29 16:41:44 UTC 2021

Hi Christoph --

Given that I needed to mimic the flexibility of morph's properties for the sake of robustness, we can add an extra "properties" instVar if necessary. Actually adding instVars for a non-essential extra in the Workspace tool felt overkill. We might want to have this for all kinds of models. Would make extensions easier. So, it's not a "new thing" per se, but an idea present in morphs applied to models.

Why do you see this as a "crazy hack"? It's rather interesting to have a tool that is able to reflect on its internals the same way as it does on external (user specified) information. ;-) Feels like a the textual version of a halo for a command line (or text buffer).

If you think that the risk of a name collision in bindings is too high, we can choose a different prefix or add an extra dictionary instVar. But then we would loose that cool self-reflection feature. :-O

> I only need to print "_fileDirectory" in a workspace and the menu will break.

That's a bug. Why should a read operation change the bindings dictionary? I did not know that. Should be an easy fix. :-)

Am 27.11.2021 21:46:44 schrieb Thiede, Christoph <christoph.thiede at student.hpi.uni-potsdam.de>:
Hi Marcel,

crazy hack, but it bites with the fact that storing underscore variables in a Workspace is a legal operation. I only need to print "_fileDirectory" in a workspace and the menu will break. Could we please just use a separate dictionary for the properties? :-)

Furthermore, how many different properties can actually be stored in a Workspace? So far I only counted 3 different keys - does this really justify the use of the Variable State pattern?

Von: Squeak-dev <squeak-dev-bounces at lists.squeakfoundation.org> im Auftrag von commits at source.squeak.org <commits at source.squeak.org>
Gesendet: Donnerstag, 25. November 2021 11:44:04
An: squeak-dev at lists.squeakfoundation.org; packages at lists.squeakfoundation.org
Betreff: [squeak-dev] The Trunk: Tools-mt.1074.mcz
Marcel Taeumel uploaded a new version of Tools to project The Trunk:
http://source.squeak.org/trunk/Tools-mt.1074.mcz [http://source.squeak.org/trunk/Tools-mt.1074.mcz]

==================== Summary ====================

Name: Tools-mt.1074
Author: mt
Time: 25 November 2021, 11:44:01.944354 am
UUID: 39954290-b416-f242-a5b0-c7aea0e3c6a6
Ancestors: Tools-mt.1073

Adds a property protocol to Workspace to avoid having to go through #containingWindow to store extra stuff, which does not even work for MVC, just for morphs (i.e., SystemWindow, not StandardSystemView). Reuses a workspace's "bindings" with each property being prefixed with a "_" to not interfere with regular bindings.

Note that such extra properties have already been added to #containingWindow in the past.

=============== Diff against Tools-mt.1073 ===============

Item was added:
+ ----- Method: Workspace>>hasProperty: (in category 'binding - properties') -----
+ hasProperty: aSymbol
+        | propertyValue |
+        propertyValue := self valueOfProperty: aSymbol.
+        propertyValue ifNil: [^ false].
+        propertyValue == false ifTrue: [^ false].
+        ^ true!

Item was changed:
  ----- Method: Workspace>>initialize (in category 'initialize-release') -----
         super initialize.
+        bindings := Dictionary new.
-        self initializeBindings.
         acceptDroppedMorphs := false.
         mustDeclareVariables := self class declareVariablesAutomatically not.
         environment := Environment current!

Item was removed:
- ----- Method: Workspace>>initializeBindings (in category 'binding') -----
- initializeBindings
-        bindings := Dictionary new!

Item was added:
+ ----- Method: Workspace>>removeProperty: (in category 'binding - properties') -----
+ removeProperty: aSymbol
+        bindings removeKey: ('_', aSymbol) asSymbol ifAbsent: [].!

Item was added:
+ ----- Method: Workspace>>resetBindings (in category 'binding') -----
+ resetBindings
+        "Remove all bindings that are not prefixed with an $_. See #setProperty:toValue:."
+        bindings keysAndValuesRemove: [:key :value | key first ~= $_]!

Item was added:
+ ----- Method: Workspace>>setProperty:toValue: (in category 'binding - properties') -----
+ setProperty: aSymbol toValue: anObject
+        anObject ifNil: [^ self removeProperty: aSymbol].
+        bindings at: ('_', aSymbol) asSymbol put: anObject.!

Item was added:
+ ----- Method: Workspace>>valueOfProperty: (in category 'binding - properties') -----
+ valueOfProperty: aSymbol
+        ^ self valueOfProperty: aSymbol ifAbsent: nil!

Item was added:
+ ----- Method: Workspace>>valueOfProperty:ifAbsent: (in category 'binding - properties') -----
+ valueOfProperty: aSymbol ifAbsent: aBlock
+        ^ bindings at: ('_', aSymbol) asSymbol ifAbsent: aBlock!

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