Beginners August 2006

beginners@lists.squeakfoundation.org

70 participants
71 discussions

Metaclass hierarchy - Explanation - Part 1
by Damien Cassou 30 Aug '06

30 Aug '06

Hi, I would like to try explaining what is the metaclass hierarchy of Smalltalk. This is always something new smalltalkers have problem with. It would be interesting if an experienced smalltalker read this mail and correct it when I'm wrong. To understand this, you have to know the following three rules by heart: 1) In Smalltalk, everything is an object 2) In Smalltalk, each object is an instance of a class 3) In Smalltalk, each class has a superclass but one called Object (in squeak, Object has a superclass called ProtoObject and this class has no superclass). Lets start with the string: 'my string' rule 1) tells us that this is an object. rule 2) tells us that this is an instance of a class. Here the class is: String rule 1) tells us that String is an object. rule 2) tells us that String is an instance of a class. The class is: String class rule 1) tells us that 'String class' is an object. rule 2) tells us that 'String class' is an instance of a class. The class is: Metaclass rule 1) tells us that Metaclass is an object. rule 2) tells us that Metaclass is an instance of a class. The class is: Metaclass class rule 1) tells us that 'Metaclass class' is an object. rule 2) tells us that 'Metaclass class' is an instance of a class. The class is: Metaclass Ok, we have a loop here so the rules are always verified. Cool ! Explanation: - An object is an instance of a class - A class is the only instance of its metaclass: String is the only instance of the metaclass 'String class'. - Each metaclass is an instance of the class Metaclass. Hope this is clear. If not, please ask.

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How to know where a BlockClosure finish
by Mathieu 28 Aug '06

28 Aug '06

Hi, I want to execute several block: block1 value block2 value block3 value but if one block return from a retrun statement I want to quit. [^3] <- want to quit here [3 + 4] So is there a way to know when a block evaluation finish by a return? I need this to interprete a file containing smalltalk and I want to control the execution beceause I need to add some condition befor evaluate a block. Thanks Math

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Changing click behaviour
by Peace Jerome 27 Aug '06

27 Aug '06

Hi Matt, Your problem was found and fixed in sq 7004. See mantis bug report. http://bugs.impara.de/view.php?id=2452 Since you are still having the problem I imangine you are using a 3.8 version of squeak and maybe a squeakland version. It has not been fixed there. You can try the patch in the bug report. If that does not work (some of the methods in the patches changed between versions) you msy be able to follow the outline of the patching to determine where to fix things in your version. Let us know how you fare. Yours in service, -- Jerome Peace P.S. I highly recommend browsing mantis for newbies. It is a good place to find answers and more importantly questions about how squeak works. A good style for mining mantis is to click view issues. Type in keywords and press the "apply filter" (aka search) button. You will get a list of relevant topics. Hmmm. You will also probably want to see even closed issues. >[Newbies] Changing click behaviour >Matt Mower self at mattmower.com >Fri Aug 25 12:35:46 UTC 2006 > > > >As a Squeak beginner (on MacOSX Tiger) one of the things that I find >most confounds me is the way that clicking a selected item deselects >it. > >Where this bothers me most is, for example, when I want to define a >method in a category where the category already has focus. When I >click back into the window the new method template is not displayed, I >have to select the category to see it. > >But the first click on the category actually deselects it, rather than >giving it selected focus. I then have to click it again to give it >focus and get the new method template. > >I find the "clicking a selected item deselects it" metaphor >counter-intuitive and would like to change it so that clicking a >selected item simply makes it selected again. > >I took a look through the user interface category in Object and a few >other places but couldn't see where this behaviour might be >controlled. > >Can anyone help me? > >Regards, > >Matt > >-- >Matt Mower :: http://matt.blogs.it/ > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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How to partition an application
by andy.burnett＠knowinnovation.com 25 Aug '06

25 Aug '06

I am slowly moving along with my Wget app - thanks to the help from this list. However I now need to understand how to 'package' my app so that it is most useful to other people. It seems as though there are 3 things I could do: 1. Add code to the HttpClient and Httpsocket (possibly moving some of the instance code to the class side) 2. Subclass the two classes 3. Leave them exactly as they are and put all the code in my new Wget class. It seems to me that putting it all into the Wget object would make it easiest for people to use it, but perhaps it makes it harder for people to reuse the code elsewhere, i.e. some of the 'helper' methods might be useful in a number of different situations - nothing to do with Wget. Subclassing the other objects seems simple, but - presumably - if everyone were to share their work this way we would end up with many many different versions of the basic classes (perhaps that would be a good thing but it could also be confusing). Finally, changing the basic objects keeps the class hierarchy clean, but I imagine most people wouldn't want to have someone else's code messing around with their classes. So... what is the best way to develop Squeak code so that other people can use it? Cheers AB

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Changing click behaviour
by Matt Mower 25 Aug '06

25 Aug '06

As a Squeak beginner (on MacOSX Tiger) one of the things that I find most confounds me is the way that clicking a selected item deselects it. Where this bothers me most is, for example, when I want to define a method in a category where the category already has focus. When I click back into the window the new method template is not displayed, I have to select the category to see it. But the first click on the category actually deselects it, rather than giving it selected focus. I then have to click it again to give it focus and get the new method template. I find the "clicking a selected item deselects it" metaphor counter-intuitive and would like to change it so that clicking a selected item simply makes it selected again. I took a look through the user interface category in Object and a few other places but couldn't see where this behaviour might be controlled. Can anyone help me? Regards, Matt -- Matt Mower :: http://matt.blogs.it/

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diffing running images between machines?
by Bakki Kudva 25 Aug '06

25 Aug '06

Hi, I have been developing on 3 machines and I shuttle the images back and forth as follows. <workstation(work)> - <laptop> - <workstation (home)> <Debian Sarge.......> - <macbookpro>-<Debian Sarge> This works just fine and the copy just takes a few minutes. However I was wondering if there was a way to sync up two running images via rsync like mechanism from within Squeak, considering that squeak map seems to do some diffing. That should be faster and more elegant. cheers, -bakki

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Re: AW: [Newbies] Making cultural simulations in Squeak with Kedama
by Offray Vladimir Luna Cárdenas 24 Aug '06

24 Aug '06

Hi Frank, Thanks for your quick answer. You can send me the image to this gmail address of a friend: santiagorr(a)gmail.com I will probe the simulations on this version and I will post my progress/problems in this list. Thanks a lot, Offray Frank Urbach escribió: > Hallo Offray! > > I can send you an image which contains kedama and odeco. I didn't know where I've found this. The version of squeak is 3.6. If it is interesting for you give me please a ftp-adress where I can uploade. If your eMail can recieve more the 10 MB I could send you the image directly. Please give me a fast response because my holiday begins in 5 hours an then I haven't access to my computer. > > Cheers > Frank > -----Original Message----- > From: offray.luna(a)javeriana.edu.co > Date: Thu, 24 Aug 2006 17:53:23 > To:beginners@lists.squeakfoundation.org > Subject: [Newbies] Making cultural simulations in Squeak with Kedama > > > > > Hi all :) . > > I have sended this message more that 10 days ago and I have no answer > from the Squeakland mailing list. I'm trying to use Squeak/Kedama for my > thesis but the time of response in the list makes me wonder if this in > the right choice considering the few time I have for it and the fact > that I'm still a beginner with Squeak. So I send the message again to > this list, hoping for the answer. I hope that this will be the right > place (you will see also some other previous discussion, about the > subject, so you can get the context). > > ----------------------------- > > I'm having problems with Kedama inside Squeak. I don't know if this is > the proper place to put this concerns but the issue was discuss in this > thread, so I thought that it was (please if this is not the place point > me in the right direction) > > I tried using first the SqueakAtenex.image from the Extremadura project, > because it's what my students and me used the last semester, but > remaking the Epidemic example I found that there is a problem with the > Kedama menu translation of Kedama in that image. In the english version > you can see four options in the viewer of the Kedama Turtle: "kedama > turtle", "scripts", "kedama turtle breed" and "kedama turtle color". In > the Atenex image you can see four also in that viewer, but one of them > is repeated ("kedama turtle") and "kedama turtle breed" is absent. It > seems that "kedama turtle breed" was translated as "tortuga kedama" > ("kedama turtle"), so adding a turtle is possible, but not increasing > the amount of turtles in a breed (at lest not as is explained in the > documentation). > > So I tried then the Squeak3.8-6665full.image but Kedama is not available > from the object catalog. Trying to update from server says that no > updates are available from server and using the Squeak Map I can`t find > Kedama either. ¿How can I find/install the Kedama if its not available > in the object catalog of an image? > > Then I tried Squeak3.9g-7054.image and Squeak3.9b-7051.image installed > from squeakland directly (without using any deb repository for Ubuntu) > and Kedama is there and I can reproduce the Epidemic simulation example, > but anytime I tried to open a *.pr project I get some error messages > about "MessageNotUnderstood: SmallInteger>>removeKey:ifAbsent:" > and other one about fonts. I can made the pr files run (after getting a > lot of that messages with the "Abandon" window), but some of them can't > run in with the "go" button for example (I need to locate the proper > scripts and make them ticking). > > ¿There is a image and changes file with Kedama working out of the box, > or there is another way to overcome the problems I show you? > > I'm obsessed and passionated with Kedama and multiagents systems. My > master thesis is on collective problem solving and I think that > Kedama/Squeak is the way to go not only in my classroom with the > students as I showed in the SqueakFest, but also in my thesis, so if you > can help me with quick answers, I will be a lot thankful, > > Cheers from Colombia, > > Offray > > Yoshiki Ohshima escribió: > >> Offray, >> >> >> >>> ¿Do you think is feasible to implement the same model in Kedama? If >>> yes, >>> >> My feeling is, yes, it looks feasible. >> >> >> >>> ¿Where is the best way to start implementing it? >>> >>> >> You can drop a Sketch onto a KedamaWorld to "fill" the world with >> turtles. Then, you create 5 patch variables each of which represents >> a "trait" in your example. You add properties that is called >> something like "origX" and "origY", and write scripts to save and >> restore the turtles' positions into these. To cache the traits value, >> turtles should have 5 properties to save the values in the patch >> variables as well (See the example of ForestFire on the web.) >> >> To initialize the patch variables, the ForestFire example should be >> helpful. It initializes the map of forest with 1 or 0 value. In this >> example, the initial values are in the range of 0 to 9 (or 1-10), but >> can be done in a similar manner. >> >> At each step, the turtles first cache the values in patch variables >> to the own properties. Then, they move around and compare the values >> in the cache with the values in neighboring patch variables, and >> modify the cached values. At last, they return to the original >> position, and write back the cached values into the patch variables. >> >> The modification made to the cached values >> is the core of the program, and it may require some amount of >> tile-scripting, but in principle, this should work. >> >> -- Yoshiki >> >> _______________________________________________ >> Squeakland mailing list >> Squeakland(a)squeakland.org >> http://squeakland.org/mailman/listinfo/squeakland >> >> >> > > > > ___________________________________ > > AVISO LEGAL: El presente correo electronico no representa la opinion o el consentimiento oficial de la PONTIFICIA UNIVERSIDAD JAVERIANA. Este mensaje es confidencial y puede contener informacion privilegiada la cual no puede ser usada ni divulgada a personas distintas de su destinatario. Esta prohibida la retencion, grabacion, utilizacion, aprovechamiento o divulgacion con cualquier proposito. Si por error recibe este mensaje, por favor destruya su contenido y avise a su remitente. > En este aviso legal se omiten intencionalmente las tildes. > > Este mensaje ha sido revisado por un sistema antivirus, por lo que su contenido esta libre de virus. > This e-mail has been scanned by an antivirus system, so its contents is free of viruses. > _______________________________________________ > Beginners mailing list > Beginners(a)lists.squeakfoundation.org > http://lists.squeakfoundation.org/mailman/listinfo/beginners > ___________________________________ AVISO LEGAL: El presente correo electronico no representa la opinion o el consentimiento oficial de la PONTIFICIA UNIVERSIDAD JAVERIANA. Este mensaje es confidencial y puede contener informacion privilegiada la cual no puede ser usada ni divulgada a personas distintas de su destinatario. Esta prohibida la retencion, grabacion, utilizacion, aprovechamiento o divulgacion con cualquier proposito. Si por error recibe este mensaje, por favor destruya su contenido y avise a su remitente. En este aviso legal se omiten intencionalmente las tildes. Este mensaje ha sido revisado por un sistema antivirus, por lo que su contenido esta libre de virus. This e-mail has been scanned by an antivirus system, so its contents is free of viruses.

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AW: [Newbies] Making cultural simulations in Squeak with Kedama
by Frank Urbach 24 Aug '06

24 Aug '06

Hallo Offray! I can send you an image which contains kedama and odeco. I didn't know where I've found this. The version of squeak is 3.6. If it is interesting for you give me please a ftp-adress where I can uploade. If your eMail can recieve more the 10 MB I could send you the image directly. Please give me a fast response because my holiday begins in 5 hours an then I haven't access to my computer. Cheers Frank -----Original Message----- From: offray.luna(a)javeriana.edu.co Date: Thu, 24 Aug 2006 17:53:23 To:beginners@lists.squeakfoundation.org Subject: [Newbies] Making cultural simulations in Squeak with Kedama Hi all :) . I have sended this message more that 10 days ago and I have no answer from the Squeakland mailing list. I'm trying to use Squeak/Kedama for my thesis but the time of response in the list makes me wonder if this in the right choice considering the few time I have for it and the fact that I'm still a beginner with Squeak. So I send the message again to this list, hoping for the answer. I hope that this will be the right place (you will see also some other previous discussion, about the subject, so you can get the context). ----------------------------- I'm having problems with Kedama inside Squeak. I don't know if this is the proper place to put this concerns but the issue was discuss in this thread, so I thought that it was (please if this is not the place point me in the right direction) I tried using first the SqueakAtenex.image from the Extremadura project, because it's what my students and me used the last semester, but remaking the Epidemic example I found that there is a problem with the Kedama menu translation of Kedama in that image. In the english version you can see four options in the viewer of the Kedama Turtle: "kedama turtle", "scripts", "kedama turtle breed" and "kedama turtle color". In the Atenex image you can see four also in that viewer, but one of them is repeated ("kedama turtle") and "kedama turtle breed" is absent. It seems that "kedama turtle breed" was translated as "tortuga kedama" ("kedama turtle"), so adding a turtle is possible, but not increasing the amount of turtles in a breed (at lest not as is explained in the documentation). So I tried then the Squeak3.8-6665full.image but Kedama is not available from the object catalog. Trying to update from server says that no updates are available from server and using the Squeak Map I can`t find Kedama either. ¿How can I find/install the Kedama if its not available in the object catalog of an image? Then I tried Squeak3.9g-7054.image and Squeak3.9b-7051.image installed from squeakland directly (without using any deb repository for Ubuntu) and Kedama is there and I can reproduce the Epidemic simulation example, but anytime I tried to open a *.pr project I get some error messages about "MessageNotUnderstood: SmallInteger>>removeKey:ifAbsent:" and other one about fonts. I can made the pr files run (after getting a lot of that messages with the "Abandon" window), but some of them can't run in with the "go" button for example (I need to locate the proper scripts and make them ticking). ¿There is a image and changes file with Kedama working out of the box, or there is another way to overcome the problems I show you? I'm obsessed and passionated with Kedama and multiagents systems. My master thesis is on collective problem solving and I think that Kedama/Squeak is the way to go not only in my classroom with the students as I showed in the SqueakFest, but also in my thesis, so if you can help me with quick answers, I will be a lot thankful, Cheers from Colombia, Offray Yoshiki Ohshima escribió: > Offray, > > >> ¿Do you think is feasible to implement the same model in Kedama? If >> yes, > > My feeling is, yes, it looks feasible. > > >> ¿Where is the best way to start implementing it? >> > > You can drop a Sketch onto a KedamaWorld to "fill" the world with > turtles. Then, you create 5 patch variables each of which represents > a "trait" in your example. You add properties that is called > something like "origX" and "origY", and write scripts to save and > restore the turtles' positions into these. To cache the traits value, > turtles should have 5 properties to save the values in the patch > variables as well (See the example of ForestFire on the web.) > > To initialize the patch variables, the ForestFire example should be > helpful. It initializes the map of forest with 1 or 0 value. In this > example, the initial values are in the range of 0 to 9 (or 1-10), but > can be done in a similar manner. > > At each step, the turtles first cache the values in patch variables > to the own properties. Then, they move around and compare the values > in the cache with the values in neighboring patch variables, and > modify the cached values. At last, they return to the original > position, and write back the cached values into the patch variables. > > The modification made to the cached values > is the core of the program, and it may require some amount of > tile-scripting, but in principle, this should work. > > -- Yoshiki > >_______________________________________________ > Squeakland mailing list > Squeakland(a)squeakland.org > http://squeakland.org/mailman/listinfo/squeakland > > ___________________________________ AVISO LEGAL: El presente correo electronico no representa la opinion o el consentimiento oficial de la PONTIFICIA UNIVERSIDAD JAVERIANA. Este mensaje es confidencial y puede contener informacion privilegiada la cual no puede ser usada ni divulgada a personas distintas de su destinatario. Esta prohibida la retencion, grabacion, utilizacion, aprovechamiento o divulgacion con cualquier proposito. Si por error recibe este mensaje, por favor destruya su contenido y avise a su remitente. En este aviso legal se omiten intencionalmente las tildes. Este mensaje ha sido revisado por un sistema antivirus, por lo que su contenido esta libre de virus. This e-mail has been scanned by an antivirus system, so its contents is free of viruses. _______________________________________________ Beginners mailing list Beginners(a)lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners

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HTTPSocket class - getting to the instance
by andy.burnett＠knowinnovation.com 24 Aug '06

24 Aug '06

First, Smalltalk is just amazing! I am so impressed with what it is possible to do - with practically no knowledge! Second. Due to my lack of knowledge I am now stuck ;-) I am still working on the problem of building a Smalltalk version of Wget. I have used the HTTPClient as my basic object and that is doing most of what I want. However, I can't get to the HTTP Headers. I noticed that HTTPSocket does seem to offer the headers but this is where I get stuck. The creation methods of HTTPSocket (i.e. telling it which url to go to) seem to only exist on the class side. But the methods for getting to headers etc only exist in the instance. I can't work out how to create an instance of the socket and tell it which url to go to. All the construction methods just seem to return the class. Obviously I am missing something pretty basic. Could someone please enlighten me? TVM AB

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Making cultural simulations in Squeak with Kedama
by Offray Vladimir Luna Cárdenas 24 Aug '06

24 Aug '06

Hi all :) . I have sended this message more that 10 days ago and I have no answer from the Squeakland mailing list. I'm trying to use Squeak/Kedama for my thesis but the time of response in the list makes me wonder if this in the right choice considering the few time I have for it and the fact that I'm still a beginner with Squeak. So I send the message again to this list, hoping for the answer. I hope that this will be the right place (you will see also some other previous discussion, about the subject, so you can get the context). ----------------------------- I'm having problems with Kedama inside Squeak. I don't know if this is the proper place to put this concerns but the issue was discuss in this thread, so I thought that it was (please if this is not the place point me in the right direction) I tried using first the SqueakAtenex.image from the Extremadura project, because it's what my students and me used the last semester, but remaking the Epidemic example I found that there is a problem with the Kedama menu translation of Kedama in that image. In the english version you can see four options in the viewer of the Kedama Turtle: "kedama turtle", "scripts", "kedama turtle breed" and "kedama turtle color". In the Atenex image you can see four also in that viewer, but one of them is repeated ("kedama turtle") and "kedama turtle breed" is absent. It seems that "kedama turtle breed" was translated as "tortuga kedama" ("kedama turtle"), so adding a turtle is possible, but not increasing the amount of turtles in a breed (at lest not as is explained in the documentation). So I tried then the Squeak3.8-6665full.image but Kedama is not available from the object catalog. Trying to update from server says that no updates are available from server and using the Squeak Map I can`t find Kedama either. ¿How can I find/install the Kedama if its not available in the object catalog of an image? Then I tried Squeak3.9g-7054.image and Squeak3.9b-7051.image installed from squeakland directly (without using any deb repository for Ubuntu) and Kedama is there and I can reproduce the Epidemic simulation example, but anytime I tried to open a *.pr project I get some error messages about "MessageNotUnderstood: SmallInteger>>removeKey:ifAbsent:" and other one about fonts. I can made the pr files run (after getting a lot of that messages with the "Abandon" window), but some of them can't run in with the "go" button for example (I need to locate the proper scripts and make them ticking). ¿There is a image and changes file with Kedama working out of the box, or there is another way to overcome the problems I show you? I'm obsessed and passionated with Kedama and multiagents systems. My master thesis is on collective problem solving and I think that Kedama/Squeak is the way to go not only in my classroom with the students as I showed in the SqueakFest, but also in my thesis, so if you can help me with quick answers, I will be a lot thankful, Cheers from Colombia, Offray Yoshiki Ohshima escribió: > Offray, > > >> ¿Do you think is feasible to implement the same model in Kedama? If >> yes, > > My feeling is, yes, it looks feasible. > > >> ¿Where is the best way to start implementing it? >> > > You can drop a Sketch onto a KedamaWorld to "fill" the world with > turtles. Then, you create 5 patch variables each of which represents > a "trait" in your example. You add properties that is called > something like "origX" and "origY", and write scripts to save and > restore the turtles' positions into these. To cache the traits value, > turtles should have 5 properties to save the values in the patch > variables as well (See the example of ForestFire on the web.) > > To initialize the patch variables, the ForestFire example should be > helpful. It initializes the map of forest with 1 or 0 value. In this > example, the initial values are in the range of 0 to 9 (or 1-10), but > can be done in a similar manner. > > At each step, the turtles first cache the values in patch variables > to the own properties. Then, they move around and compare the values > in the cache with the values in neighboring patch variables, and > modify the cached values. At last, they return to the original > position, and write back the cached values into the patch variables. > > The modification made to the cached values > is the core of the program, and it may require some amount of > tile-scripting, but in principle, this should work. > > -- Yoshiki > > _______________________________________________ > Squeakland mailing list > Squeakland(a)squeakland.org > http://squeakland.org/mailman/listinfo/squeakland > > ___________________________________ AVISO LEGAL: El presente correo electronico no representa la opinion o el consentimiento oficial de la PONTIFICIA UNIVERSIDAD JAVERIANA. Este mensaje es confidencial y puede contener informacion privilegiada la cual no puede ser usada ni divulgada a personas distintas de su destinatario. Esta prohibida la retencion, grabacion, utilizacion, aprovechamiento o divulgacion con cualquier proposito. Si por error recibe este mensaje, por favor destruya su contenido y avise a su remitente. En este aviso legal se omiten intencionalmente las tildes. Este mensaje ha sido revisado por un sistema antivirus, por lo que su contenido esta libre de virus. This e-mail has been scanned by an antivirus system, so its contents is free of viruses.

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Beginners August 2006