August 2009 - Beginners - lists.squeak.org

Is there a tandard way to attach context menus
by Herbert König 04 Nov '11

04 Nov '11

Hello all, is there a standard way to attach a context menu to a morph? It's fairly easy to do by checking for yellowButtonPressed and manually firing up a MenuMorph. But it is sufficient to implement #addCustomMenuItems:hand: to get an enhanced Halo menu while #addYellowButtonMenuItemsTo:event: and #hasYellowButtonMenu don't help. So is there a predefined way without everybody doing his own? Thanks, Herbert mailto:herbertkoenig@gmx.net

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Omnibrowser help
by Rob Rothwell 14 Aug '11

14 Aug '11

Are there some tips/documentation somewhere on getting the most out of the OmniBrowser? The MulitpleSelection browser looks interesting (sort of like the tabbed browser in VisualWorks), but I don't quite understand its behaviour and what method it decides to show in which pane when you move around or save changes. On the same topic, can anyone point me toward how I could add a new item to the class context menu in the OmniBrowser? I want to add a new template selection menu item (like "new class template" and "new trait template") because I have created a method that creates TWO classes at the same time for an Aida application (A domain model class AND its associated WebApp class). Thanks, Rob Rothwell

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Resources with Monticello
by Matthias Korn 15 Apr '10

15 Apr '10

Hi all, how does one work with resources (e.g. image files (GIFs, ...)) used in the application when working with Monticello and in general? Right now I have them on my hard drive and they are read live into Squeak when they are needed. Of course, others don't have the files at hand when working in a distributed fashion. What are the best practices in regard of distribution/packaging as well as performance? Thanks, Matthias -- Matthias Korn Institut für Wirtschaftsinformatik Fachbereich 5 Universität Siegen Telefon: +49 (0) 271 / 23 67 660 Mobil: +49 (0) 176 / 700 17 17 8 Uni: +49 (0) 271/ 740 - 3382 eMail: matthias.korn(a)uni-siegen.de

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Parsing and splitting file contents
by r00t uk 01 Sep '09

01 Sep '09

Ok, I am new to smalltalk. I have tried browsing and searching for methods related to parsing and splitting file contents based on a delimiter, but I am not having much success. :( Old google is not helping either so I can only assume that I am missing something "obvious". I am reading a tab delimited file into a string. I want to iterate through this string and split by tab, or any other defined value (, . | # tab, cr, etc.), delimiter into substrings which are assigned to a Collection (Array, Dictionary, Bag, etc.), or instant variables. I was hoping there was going to be something like: Bag := FileStream collect: [:x | split: crlf]. Dictionary := Bag collect: [:x | split: tab]. Does that make any sense? Basically create Bag with contents of FileStream split by crlf and then split Bag elements by tab into key value pairs. Again, I am surprised by the lack of examples demonstrating to newbies how to perform basic operations such as this. I know it is not the smalltalk way of learning, but it does raise the bar for making progress. The language may be easy, but finding which methods to use to solve problems is a bit laborious. Thanks in advance.

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Re: How to introspect method instance variables
by rdmerrio 29 Aug '09

29 Aug '09

The fact that I would potentially need to hack the compiler to write my little app raised a huge red flag for me, which indicated that I was probably not approaching the problem correctly. I was not reaching Smalltalk ZEN. As such, I approached the issue from a different angle and am happy to say that i accomplished my goal. I went from ground zero with Smalltalk to accomplishing my goal in just a few days and am actually quite pleased with the outcome. I have not had the same early success in other languages I have tried ... So i am very pleased with Smalltalk and its development environment. > >> So ... all you need to do is hack the Compiler :) >> > > And it takes two new methods and four very minor overrides in some > subclasses. > > -- Yoshiki > >

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WTG Qwaq
by Chris Hogan 29 Aug '09

29 Aug '09

I just ran across this link on reddit. http://gcn.com/articles/2009/08/24/data-visualization-sidebar-2-navy-sub.as… Navy creates a virtual world to test submarine design It's always nice to see squeak in the news. :clap: -- View this message in context: http://www.nabble.com/WTG-Qwaq-tp25167511p25167511.html Sent from the Squeak - Beginners mailing list archive at Nabble.com.

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How to introspect method instance variables
by rdmerrio 27 Aug '09

27 Aug '09

The reason for the question is strictly pedagogical. I am learning Smalltalk and i am playing with implementation of a Cells type package ala LISP or pyCells and Cellulose from the Python world. I do not really expect complete this, as I said its just a learning exercise. The question around the instance variables stems from the fact that they appear to be tantalizingly close to the surface given the fact that the Browser recognizes undeclared identifiers and asks if they are temps or instance and then plugs in the code for me. I am just too new to be able to figure out how to intercept the messages being sent. Thanks for the help and suggestions. beginners-request(a)lists.squeakfoundation.org wrote: > Send Beginners mailing list submissions to > beginners(a)lists.squeakfoundation.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.squeakfoundation.org/mailman/listinfo/beginners > or, via email, send a message with subject or body 'help' to > beginners-request(a)lists.squeakfoundation.org > > You can reach the person managing the list at > beginners-owner(a)lists.squeakfoundation.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Beginners digest..." > > > Today's Topics: > > 1. How to introspect method instance variables (rdmerrio) > 2. Re: How to introspect method instance variables > (Michael van der Gulik) > 3. Re: How to introspect method instance variables (Yoshiki Ohshima) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 24 Aug 2009 21:16:16 -0500 > From: rdmerrio <rdmerrio(a)gmail.com> > Subject: [Newbies] How to introspect method instance variables > To: beginners(a)lists.squeakfoundation.org > Message-ID: <4A934970.4070202(a)gmail.com> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > I have defined a method, i.e., > > someMethod > anInstVariable := anotherInstVariable1 + anotherInstVariable2. > > I would like to intercept the acceptance of this method by the browser > and programatically determine what instance variables this method is > using so that I can grab these names for other processing tasks. > > Additionally, I would really like to be able to determine what instance > variables are being assigned to, for instance, anInstVariable in this > case and which ones are the "independent" instance variables, > anotherInstVariable1 and anotherInstVariable2 in this case. > > How can I do this? > > Thanks > > > ------------------------------ > > Message: 2 > Date: Tue, 25 Aug 2009 14:34:18 +1200 > From: Michael van der Gulik <mikevdg(a)gmail.com> > Subject: Re: [Newbies] How to introspect method instance variables > To: "A friendly place to get answers to even the most basic questions > about Squeak." <beginners(a)lists.squeakfoundation.org> > Message-ID: > <1b61adf40908241934ve0f2ba1iacb768b3b122b94d(a)mail.gmail.com> > Content-Type: text/plain; charset="iso-8859-1" > > On Tue, Aug 25, 2009 at 2:16 PM, rdmerrio <rdmerrio(a)gmail.com> wrote: > > >> I have defined a method, i.e., >> >> someMethod >> anInstVariable := anotherInstVariable1 + anotherInstVariable2. >> >> I would like to intercept the acceptance of this method by the browser and >> programatically determine what instance variables this method is using so >> that I can grab these names for other processing tasks. >> >> Additionally, I would really like to be able to determine what instance >> variables are being assigned to, for instance, anInstVariable in this case >> and which ones are the "independent" instance variables, >> anotherInstVariable1 and anotherInstVariable2 in this case. >> >> How can I do this? >> >> > > Why? What are you trying to achieve? You're talking about some pretty > intrusive techniques. Unless you're developing a code analyser of some sort, > you probably should be looking at a better way of doing what you're doing. > > To capture the acceptance of a method (assuming you mean the action that > happens when you press alt+s), you insert a bit of code into > PluggableTextMorph>>accept. > > To determine which instance variables are being assigned to, you'll need to > somehow look at the bytecodes. They're not too hard to analyse, but it can > be a bit of work. Alternatively, maybe the refactory browser can help, or > maybe you can look at the intermediate code that the compiler generates. > > The bytecodes are described here: > http://burks.bton.ac.uk/burks/language/smaltalk/goldberg/blueb003.htm. > They're in the "Blue book chapter 28" if you need to Google it. You'll want > the "store" bytecodes. > > To see real bytecodes, either inspect "Morph>>#basicInitialize" to see a > CompiledMethod, or use the "byteCodes" view in a Browser (hidden behind the > "source" button). > > Gulik. > >

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how to sort by key a Dictionary object?
by r00t uk 26 Aug '09

26 Aug '09

Hello All I have a Dictionary object containing key value objects. I want to be able to retrieve the key-values by sort order on the key field. Any ideas or pointers would be greatly appreciated. At the moment everything is being returned unsorted. The key field is a year date and the value a URL to that year's archive. Thanks in advance for the information.

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Re: how to sort by key a Dictionary object?
by Overcomer Man 26 Aug '09

26 Aug '09

I know this was already covered but to simplify the explination for the beginner: Sort is automatic for Dictionaries. | dict | dict := Dictionary new. dict at: '3c' put: 'object 3c'. dict at: '1a' put: 'object 1a'. dict at: '2b' put: 'object 2b'. dict Evaluating the code with "Print It" will respond: a Dictionary('1a'->'object 1a' '2b'->'object 2a' '3c'->'object 3a' ) ---------------------- A useful capability of Dictionaries is merging files by key. Add old objects then overwriting with new objects and sorting is automatic. | dict | dict := Dictionary new. dict at: '3c' put: 'object 3c'. dict at: '1a' put: 'object 1a'. dict at: '3c' put: 'new object 3c'. dict a Dictionary('1a'->'object 1a' '3c'->'new object 3c' )

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How to introspect method instance variables
by rdmerrio 25 Aug '09

25 Aug '09

I have defined a method, i.e., someMethod anInstVariable := anotherInstVariable1 + anotherInstVariable2. I would like to intercept the acceptance of this method by the browser and programatically determine what instance variables this method is using so that I can grab these names for other processing tasks. Additionally, I would really like to be able to determine what instance variables are being assigned to, for instance, anInstVariable in this case and which ones are the "independent" instance variables, anotherInstVariable1 and anotherInstVariable2 in this case. How can I do this? Thanks

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Equivalent of Ruby's YAML::load in smalltalk
by Frank Church 21 Aug '09

21 Aug '09

Is there a smalltalk command that can load YAML into a Smalltalk array? -- Frank Church ======================= devblog.brahmancreations.com

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ShoutWorkspace, don't colorize syntax
by Giuseppe Luigi Punzi 17 Aug '09

17 Aug '09

Hi, Somebody knows, why, ShoutWorkspace doesn't color the syntax? Cheers.

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Help me FileIn
by Overcomer Man 17 Aug '09

17 Aug '09

Somehow the design of Squeak omits "fileIn" from the same menu as "fileOut" so it's hard to know what works on fileOut is going to work on fileIn. I'm trying to convert software written in another Smalltalk and it would help to file it in. At least adopting each class to Squeak's fileIn format would be easier than copying in every method one at a time. So please help me fileIn. Thanks.

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Peripheral Tutorial?
by Overcomer Man 15 Aug '09

15 Aug '09

Hi, What tutorial is best for learning to work with peripherals? For example, I want to work with USB ports and eventually run a multiple axis robot with sensors, actuators, and a webcam. Maybe even do it using a wireless USB device. Where would I learn to work with things like that as well as scanners and printers controlled by Squeak, Croquet, or Seaside? Thanks much. Kirk Fraser Clatskanie, OR USA

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Win98SE + Squeak?
by Leandro Juarez 09 Aug '09

09 Aug '09

Hi there. I'm Leandro from Rosario, ARG, and I'm trying to run the latest version of Squeak from a machine that is running on WIN98SE. But it doesn't work at all. Any idea why? It's a celeron 900mhz with 284 Mb RAM. I tried to run on an IBM Thinkpad 600E, and it doesn't work also. I would appreciate if anyone tells me which version of squeak should I try with. Thanks in advance. -- Leandro Juarez leandroo(a)gmail.com

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Finished first application
by richard snow 05 Aug '09

05 Aug '09

I've managed to finish my first Squeak app. It has a GUI, and saves the data in XML format using SIXX. It is a Debt Payoff Calculator. You input your income, monthly expenses, and the debts that are outstanding with the interest rates. It prints to the Transcript a report showing how long it would take you to pay off all the debts. -- http://mypals.info

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class variable vs class instance variable uses
by Miguel Enrique Cobá Martinez 05 Aug '09

05 Aug '09

What is the difference between a class variable like Current in Locale class: Object subclass: #Locale instanceVariableNames: 'id shortDate longDate time decimalSymbol digitGrouping currencySymbol currencyNotation measurement offsetLocalToUTC offsetVMToUTC dstActive' classVariableNames: 'Current CurrentPlatform KnownLocales LanguageSymbols LocaleChangeListeners PlatformEncodings' poolDictionaries: '' category: 'System-Localization' that is accessed as (in class side): current "Current := nil" Current ifNil: [ Current := self determineCurrentLocale. "Transcript show: 'Current locale: ' , Current localeID asString; cr"]. ^Current and current in SmalltalkImage class side: SmalltalkImage class instanceVariableNames: 'current' that is accessed as: current "Note that this could be implemented differently to avoid the test" current isNil ifTrue: [current := self basicNew]. ^ current I'm trying to create a singleton but I have some doubts in the correct implementation. I have also seen the explanation on http://coweb.cc.gatech.edu/cs2340/3872 also: http://stackoverflow.com/questions/438729/smalltalk-singleton-pattern-how-d… that corresponds to the first type, using (I suppose) a class variable and http://wiki.squeak.org/squeak/939 that corresponds to the second type. Are there guidelines or pros/cons about singletons on Smalltalk? Thanks, Miguel Cobá

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Re: Beginners Digest, Vol 40, Issue 4
by richard snow 05 Aug '09

05 Aug '09

I can put the image up on my website. It is based on squeak 3.10. the image is at http://mypals.info/files/debt/rssdebt.tar.gz Richard Snow On 8/4/09, beginners-request(a)lists.squeakfoundation.org <beginners-request(a)lists.squeakfoundation.org> wrote: > Send Beginners mailing list submissions to > beginners(a)lists.squeakfoundation.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.squeakfoundation.org/mailman/listinfo/beginners > or, via email, send a message with subject or body 'help' to > beginners-request(a)lists.squeakfoundation.org > > You can reach the person managing the list at > beginners-owner(a)lists.squeakfoundation.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Beginners digest..." > > > Today's Topics: > > 1. Re: OCompletion remnants (C?drick B?ler) > 2. Re: Finished first application (Benjamin L. Russell) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Tue, 4 Aug 2009 00:06:26 +0200 > From: C?drick B?ler <cdrick65(a)gmail.com> > Subject: Re: [Newbies] OCompletion remnants > To: "A friendly place to get answers to even the most basic questions > about Squeak." <beginners(a)lists.squeakfoundation.org> > Message-ID: > <a49ceb00908031506j2ef1d484ueda48f31d84e47d8(a)mail.gmail.com> > Content-Type: text/plain; charset=UTF-8 > > 2009/8/2 Paul DeBruicker <pdebruic(a)gmail.com>: >> Hi - >> >> >> I am using Pharo 10388 on Ubuntu 64bit. Through some errant clicking >> while OCompletion was auto-completing I have 9 stranded auto-complete >> drop down menu instances in my image. They're not impacting >> functionality at all but I cannot close them. When I right click on >> them, an OXMenu pops up but it doesn't have a close or delete >> function. How can I close them? > > in the inspector you can evaluate self delete > > or in a workspace, I think this should work: > OXMenuMorph allInstances do: [:ea | ea delete ] > > hth, > > >> >> >> Thanks >> >> Paul >> _______________________________________________ >> Beginners mailing list >> Beginners(a)lists.squeakfoundation.org >> http://lists.squeakfoundation.org/mailman/listinfo/beginners >> > > > > -- > Cédrick > > > ------------------------------ > > Message: 2 > Date: Mon, 3 Aug 2009 21:49:33 -0700 (PDT) > From: "Benjamin L. Russell" <dekudekuplex(a)yahoo.com> > Subject: Re: [Newbies] Finished first application > To: "A friendly place to get answers to even the most basic questions > about Squeak." <beginners(a)lists.squeakfoundation.org> > Message-ID: <150846.85750.qm(a)web32305.mail.mud.yahoo.com> > Content-Type: text/plain; charset=us-ascii > > [For some reason, my previous post of identical content was not archived, so > this post is being re-sent.] > > On Sun, 2 Aug 2009 18:29:37 -0500, richard snow > <richard.snow(a)gmail.com> wrote: > >>I've managed to finish my first Squeak app. It has a GUI, and saves >>the data in XML format using SIXX. It is a Debt Payoff Calculator. >>You input your income, monthly expenses, and the debts that are >>outstanding with the interest rates. It prints to the Transcript a >>report showing how long it would take you to pay off all the debts. > > Congratulations! > > Do you have an image file which we can load with which to try it out? > > -- Benjamin L. Russell > -- > Benjamin L. Russell / DekuDekuplex at Yahoo dot com > http://dekudekuplex.wordpress.com/ > Translator/Interpreter / Mobile: +011 81 80-3603-6725 > "Furuike ya, kawazu tobikomu mizu no oto." > -- Matsuo Basho^ > > > ------------------------------ > > _______________________________________________ > Beginners mailing list > Beginners(a)lists.squeakfoundation.org > http://lists.squeakfoundation.org/mailman/listinfo/beginners > > > End of Beginners Digest, Vol 40, Issue 4 > **************************************** > -- http://mypals.info

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OCompletion remnants
by Paul DeBruicker 04 Aug '09

04 Aug '09

Hi - I am using Pharo 10388 on Ubuntu 64bit. Through some errant clicking while OCompletion was auto-completing I have 9 stranded auto-complete drop down menu instances in my image. They're not impacting functionality at all but I cannot close them. When I right click on them, an OXMenu pops up but it doesn't have a close or delete function. How can I close them? Thanks Paul

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Squeakfest Brasil report
by Bert Freudenberg 03 Aug '09

03 Aug '09

Forwarding a message from Marta, member of Squeakland's education team, who organized an awesome Squeakfest in Porto Alegre last week. - Bert - ------------------------------ From: "Marta Voelcker" <marta(a)pensamentodigital.org.br> Date: 3. August 2009 00:45:30 MESZ To: <squeakland(a)squeakland.org> Subject: [squeakland] Hello from Porto Alegre Hello, I would like to thank the Etoys team that came to Porto Alegre and have joined us at Squeakfest Brasil and World Conference on Computers in Education www.wcee2009.org From July 23 to 25th we had around 300 people attending Sqeuakfest Brasil at UFRGS Porto Alegre. The conference was held in an auditorium for 250 people and 3 rooms ( located near the auditorium) each room with 20 laptops each. Hands on workshops on these rooms were always crowded. Colleagues from our local research group, Teachers from Uruguay, Kathleen Harness, Kathleen Smith and Avigail Snir ( from Etoys Illinois) and Randall Caton and children form Luciana de Abreu School, have conducted hands on workshops. One of the rooms had focus for developers ( since most attendees were educators), there Yoshiki, Scott Wallace, Alex Warth, Bert and Rita Freudenberg, plus Gonzalo Sabala ( Argentina) and Jecel ( Brasil) conducted activities for developers or activities related to robotics. On the main room there was several kinds of presentations, from a PhD Thesis (Edson Lindner) to high school student sharing their experiences. Local reports like Sdenka Salas Pilco from Peru, and many friends from Uruguay where great! Lea Fagundes pleased us with a great presentation “Why powerful ideas?” and ended the conference with many plans to disseminate the one to one modality among the more than 20 municipalities attending the conference. The Squeakfest had a great and friendly atmosphere. This was the first time that I organized a conference like this, I could be nervous, but I had the constant feeling that I was among friends! I look forward to lead the organization of the second Squeakfest Brasil for July 2010! From July 27th to 31st I, Tim, Rita, Bert, Scott, Yoshiki, Alex Warth, Kathleen Harness, Kathleen Smith, Avigail Snir attended WCCE in Bento Gonçalves, a city near Porto Alegre. There, we have interacted with many other researchers and students working in different areas on ICT for Education. We conducted a Workshop and a Panel about Squeak Etoys. Well, two weeks ago few people in Brasil new about squeak etoys. Now we end the week with a new mailing list America-latina(a)squeakland.org with more than 230 participants and many plans for this new local community, for that and for your friendship and support I want to say thank you for all those that came to Proto Alegre, and for those that couldn´t come, you can start planning for 2010 J, cause we are certainly going to gather again! Kind regards and a I wish you a great Squeakfest in Los Angeles, Marta _______________________________________________ squeakland mailing list squeakland(a)squeakland.org http://lists.squeakland.org/mailman/listinfo/squeakland

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Generating printable output files from Squeak
by Kevin Polston 03 Aug '09

03 Aug '09

Hi I'd like to create a printable output file from within Squeak, for instance to create a report. I've done a little Googling and I'm surprised by how little material in the way of examples relating to creating printable files exist. However, I've found a couple of classes class called PostscriptCanvas and EPSCanvas and a method within it called morphAsPostscript. To try these classes out I created a tiny code example and my first workspace example was: p := PasteUpMorph new. p extent: 300@300. p position: 20@20. p borderColor: Color black. p setProperty: #cornerStyle toValue: #rounded. p openInWorld. (FileStream newFileNamed: 'test1.ps') nextPutAll: (PostscriptCanvas morphAsPostscript: p). unfortunately the above doesn't work and halts with doesnotUnderstand #pageBBox. when I try the example again but this time using the EPSCanvas class: p := PasteUpMorph new. p extent: 300@300. p position: 20@20. p borderColor: Color black. p setProperty: #cornerStyle toValue: #rounded. p openInWorld. (FileStream newFileNamed: 'test2.eps') nextPutAll: (EPSCanvas morphAsPostscript: p). this time I generate output but the corners of the box aren't rounded in the eps file (they are rounded on the screen). So, my questions are: 1) Am I on the right track as far as generating printable output or should I be using an alternative technique? 2) Why does the first example crash with doesnotUnderstand #pageBBox? 3) Why does the second example *almost* work but does not render the rounded corners? Many thanks Kevin

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\n equivalent?
by Paul DeBruicker 03 Aug '09

03 Aug '09

Hi - What Character or String is equal to \n in C or Python? Thanks Paul

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Beginners August 2009