Beginners May 2006

beginners@lists.squeakfoundation.org

65 participants
84 discussions

Smacc
by mathieu 03 Jun '06

03 Jun '06

Hello, I'm playing :-) with SmaCC and I get an error. I think I have not perform all dependency. What should I do with this error: RBNamespace new-> MessageNotUnderstood #new Thx Math ___________________________________________________________________________ Yahoo! Mail réinvente le mail ! Découvrez le nouveau Yahoo! Mail et son interface révolutionnaire. http://fr.mail.yahoo.com

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dependency mechanism
by Chris Kassopulo 01 Jun '06

01 Jun '06

Greetings, The basic dependency example from "Smalltalk By Example" uses Visualworks changed:with and update:with:from: methods like this: price: aPrice | oldPrice | oldPrice := self price. price := aPrice. self changed: #price with: oldPrice update: aSymbol with: oldPrice from: aStock (aSymbol == #price) ifTrue: [Transcript cr; show: thisContext; tab; show: aSymbol; tab; nextPutAll: 'Price changed from: '; show: oldPrice; tab; nextPutAll: 'To: '; show: aStock price; flush] The problem is that Squeak only implements update:with: so the aStock price messaging doesn't work. My solution was to follow VW's implementation by making the following changes: Modified the changed:with: method to include from:. changed: anAspect with: anObject self dependents do: [:aDependent | aDependent update: anAspect with: anObject from: self] Added an update:with:from: method. update: anAspect with: anObject from: aSender ^ self update: anAspect with: anObject It took a while to see the problem and without looking at VW, I never would have been able to figure a way. Is my fix reasonable? VW also implements expressInterestIn:for:sendBack: and onChangeSend:to: methods. Anyone familiar with them and care to provide pointers on the possibility of implementing something similar in Squeak? Thanks, Chris

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object siblings and duplicates
by Sandy Saline 01 Jun '06

01 Jun '06

Can someone please explain about siblings and duplicates of an object? When do I use each one and how do the scripts interact with each other? Thanks Sandy

3 2

A true beginner with undo
by Guy 31 May '06

31 May '06

Hi beginners, I'm beginning too with Squeak and one of the most important things for à beginner is how to undo. So with Etoys and the drawing tool, I can undo one level an the only way to do more, is to use the eraser. Something I misunderstand or is it true ? Thank you. Guy Veyssiere

2 1

Update very long
by mathieu 31 May '06

31 May '06

Hi, I have try to update squeak (3.9b) from the squak menu (on the left hand side 'load code update' ) and it toke me more than 3/4 of an hour before I kill squak process. The appplication have eaten more than 800Mo of memory. Those it's normal and should I wait for a longer time? thx Math ___________________________________________________________________________ Faites de Yahoo! votre page d'accueil sur le web pour retrouver directement vos services préférés : vérifiez vos nouveaux mails, lancez vos recherches et suivez l'actualité en temps réel. Rendez-vous sur http://fr.yahoo.com/set

3 2

RadioButton's
by Andreas Blüher 31 May '06

31 May '06

Hello, i have a problem with the ThreePhaseButtonMorph. I want to realize 3 radioButton to chose a degree of difficulty. I one button is chosen, no other should be "state: #pressed". I'm quiet new @ squeak and i realy don't know whats necessary to be pasted here. Has anybody a good tutorial how to use those RadioButton's in a way like i can use them in visual studio. Thanks for any suggestion Andreas

2 1

Class empty
by mathieu 31 May '06

31 May '06

Hello squeakers, Reading a bit of code I have found strange class MorphicTextEditor, MvcTextEditor and SoundService in the 3.8 image. Why those those class are doing absolutly nothing. THX. Math ___________________________________________________________________________ Yahoo! Mail réinvente le mail ! Découvrez le nouveau Yahoo! Mail et son interface révolutionnaire. http://fr.mail.yahoo.com

1 0

creating smooth graphic in squeak
by andy.burnett＠knowinnovation.com 30 May '06

30 May '06

I have only just started playing with squeak and I suspect this is a very very basic question! The graphics in the squeak environment -- and by that I mean things like the lines drawn round boxes and even the little widgets of the closing windows etc -- seemed to be very primitive. They seemed to lack the anti alias smoothness which you find in, for example, flash. I've tried running squeak on both Windows and Mac, and the graphics do seem smoother on the Macintosh. So this makes me wonder if there is a setting somewhere in the Windows environment which I have missed. To put it another way, is there a way to get squeak to use the native Windows widgets? Thanks in advance Andy

3 2

Help! SqueakE Vat to E Vat Negotiation Trace
by Natalie Threadingham 30 May '06

30 May '06

Hi Hoping someone can help me. I have been looking at the SqueakE Vat to E Vat Negotiation Trace as the entire paragraph of code has been given to me as a puzzle to solve and it has only been through endless searching on the web that I have discovered this title fits to this page of code. I not mathematically inclined and do not understand programming or anything like that which is why I need some help. What does it all mean? What does it create? Can anyone please help me? Many thanks Natalie

2 1

[Magritte] default value again
by math 28 May '06

28 May '06

Hello, I have folllowing the exercises of Magritte (http://www.lukas-renggli.ch/smalltalk/magritte) but I can't set the default value of nationality field. Here my code: descriptionNationality ^ (MASingleOptionDescription auto: 'nationality' label: 'Nationality' priority: 55) options: #( 'France' 'England' 'Switzerland' 'Span' ); default: 'Switzerland'; beSorted; yourself Somthing strange is that I have 2 selected option blanck. I have try to do this with Title option and it work.: descriptionTitle ^ (MASingleOptionDescription auto: 'title' label: 'Title' priority: 10) options: #( 'Mr.' 'Mrs.' 'Ms.' 'Miss.' ); default: 'Mrs'; yourself. If somone know what is going wrong :-\ ... Thanks.

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Beginners May 2006