Beginners December 2008

beginners@lists.squeakfoundation.org

31 participants
30 discussions

23 to 23rd?
by Tim Johnson 11 Dec '08

11 Dec '08

Hi, Does anyone have, or know of, existing code to perform the rather anglo-centric (?) function of turning 3 into '3rd,' 22 into '22nd,' etc.? Thanks, TimJ

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what's a model?
by Aidan Gauland 11 Dec '08

11 Dec '08

Hello, I've been poking around on the web for information on how to build GUIs using Morphic's widget-like morphs, and I've found some helpful stuff, but a term that I see used a lot in this context is "model", which I still can't figure out. So my question is: "What's a model in Squeak? How do I use them with Morphs?" Thanks, Aidan

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new vs. initialize
by Greg A. Woods; Planix, Inc. 10 Dec '08

10 Dec '08

So this problem I posted on squeak-dev about BDFFontReader and how it has its own #new class method to create new instances of itself, but in doing so failed to also send an #initialize message to each new instance and thus when it was actually used an instance variable was left as nil when it should not have been. One recommendation was to simply remove the #new method and thus default to the superclass #new which, if I'm not mistaken, would then result in #new from Behaviour to be invoked and that one does also send #initialize to self. I think, IIUC, this recommendation only makes sense because BDFFontReader is a direct subclass of Object. Initially though this recommendation didn't make any sense to me because I didn't know how the implementation of #new in Behaviour is different from strict Smalltalk-80 as I understand it. I.e. originally in Smalltalk-80 #new did not also send #initialize, but now in Squeak it does. Just for fun I did a search for senders of #basicNew and I found quite a few which are from #new methods in classes which subclass directly from Object and which are in classes that also define their own #initialize method. The curious bit is how some of these #new methods do send #initialize, but not all. I'm guessing some that don't are for abstract classes, but is it true that all are? Now I read on the WWW that the added sending of #initialize from Behaviour>>new was added in 3.9. Unfortunately whomever actually did the change failed to document the important differences here, and why! How is it that with such a wonderful system for documenting code we still end up with totally missing documentation? I've now gone on a huge wild goose chase because of this. How many others who have not kept track of how Squeak is evolving away from other Smalltalk-80 implementations will waste similar amounts of time? I'm guessing that some of the now unnecessary #new methods are simply still not cleaned up since then? If so, why not? They're easy enough to find! Also, doesn't this still create an _enormous_ portability problem with other Smalltalks? (BTW, I'm not even sure I buy into any of the other arguments for having default invocation of #initialize, i.e. those beyond the blatant incompatibility with what seems to be _all_ other implementations and _all_ existing documentation about the fundamentals of Smalltalk. I remember naively thinking this would be a good idea way back in the early 80's when I last spent any amount of time fiddling with Smalltalk, and I also seem to remember all the wise gurus around me quietly patting me on the head and telling me that no, such a change would not be welcome, and I should just learn to do things explicitly like they should be done.) -- Greg A. Woods; Planix, Inc. <woods(a)planix.ca>

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Re: [Newbies] How to make a PluggableTextMorph read-only?
by Steve Wessels 09 Dec '08

09 Dec '08

Daniel, Actually, I know I solved this problem when I wrote eIRC for Squeak. I don't have access to a computer system with Squeak development installed, so I cannot just quickly look up the code. The most useful skill you can have when programming, in Squeak, Smalltalk, or any other development language, is what I've sometimes called "Code Archeology". You should be able to take steps to read that source package whether it's compatible or not. It's been some time since I've worked in Croquet, so I may be mistaken on some details, but you should be able to save your existing work in such a way that you can still install eIRC (if in fact it's not compatible), peruse the code for ideas, and then exit/quit your environment. In this way you wouldn't change your working image. Sorry, I'm not able to just directly answer your question. My memory about the solution is that you will either find a protocol for the text pane, or it's controller, that can make it read-only, or you could simply subclass the pane and it's controller to add unique behavior like that. I think the subclass technique is what I did because it gave me the added flexibilty of accepting some user keystrokes. User keystrokes of up and down arrow and page keys are useful inputs, for example. Copy and Paste key actions may also be desired. I know I solved this kind of issue for eIRC several years ago, but can only describe the process or concept I used from memory. Cheers, - Steve On Dec 8, 2008, at 2:25 PM, Daniel Taschik <Daniel.Taschik(a)student.hpi.uni-potsdam.de> wrote: -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi Steve, thanks for your quick response. But unfortunatly I can't install eIRC because it is probably to old. I am using Croquet 1.0. Maybe you could explain me what the eIRC does to make his pluggable TextMorph read-only if it runs at your Computer. Kind regards, Daniel Taschik - -- mail: daniel.taschik(a)student.hpi.uni-potsdam.de web: www.taschik.com mobile: +49 162 7604429 skype: danieltaschik icq: 106018852 jabber: daniel.taschik(a)googlemail.com On 08.12.2008, at 13:30, Steve Wessels wrote: Look at the code used in eIRC - Steve On Dec 8, 2008, at 6:27 AM, Daniel Taschik <daniel.taschik(a)student.hpi.uni-potsdam.de> wrote: -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi Folks, I'm working on a project at my University and we develop a TetriNet Client with Squeak. We have a small problem on how to make a PluggableTextMorph read-only. The Morph shall display the log of the internal Chat. Can anyone tell me how to force him to just display the text so that nobody can write in it? Tanks a alot! Daniel Taschik - -- mail: daniel.taschik(a)student.hpi.uni-potsdam.de web: www.taschik.com mobile: +49 162 7604429 skype: danieltaschik icq: 106018852 jabber: daniel.taschik(a)googlemail.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.8 (Darwin) iEYEARECAAYFAkk9EqkACgkQo9checNKopQdhQCdGvNAboaf2OmnB9oD2VVHbKLf CuwAn2K+l9apdeieWvL5ETmeufIfO1/B =Kitn -----END PGP SIGNATURE----- _______________________________________________ Beginners mailing list Beginners(a)lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners _______________________________________________ Beginners mailing list Beginners(a)lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.8 (Darwin) iEYEARECAAYFAkk9gtQACgkQo9checNKopQFdwCgl0UBQ6JrJqPjyO5aBcBqOyMC z9YAn2rfTANynydZeA6ZuX8c2utJHOcD =G+hI -----END PGP SIGNATURE----- _______________________________________________ Beginners mailing list Beginners(a)lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners

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How to make a PluggableTextMorph read-only?
by Daniel Taschik 09 Dec '08

09 Dec '08

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi Folks, I'm working on a project at my University and we develop a TetriNet Client with Squeak. We have a small problem on how to make a PluggableTextMorph read-only. The Morph shall display the log of the internal Chat. Can anyone tell me how to force him to just display the text so that nobody can write in it? Tanks a alot! Daniel Taschik - -- mail: daniel.taschik(a)student.hpi.uni-potsdam.de web: www.taschik.com mobile: +49 162 7604429 skype: danieltaschik icq: 106018852 jabber: daniel.taschik(a)googlemail.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.8 (Darwin) iEYEARECAAYFAkk9EqkACgkQo9checNKopQdhQCdGvNAboaf2OmnB9oD2VVHbKLf CuwAn2K+l9apdeieWvL5ETmeufIfO1/B =Kitn -----END PGP SIGNATURE-----

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Re: [Newbies] How to make a PluggableTextMorph read-only?
by Steve Wessels 08 Dec '08

08 Dec '08

Look at the code used in eIRC - Steve On Dec 8, 2008, at 6:27 AM, Daniel Taschik <daniel.taschik(a)student.hpi.uni-potsdam.de> wrote: -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi Folks, I'm working on a project at my University and we develop a TetriNet Client with Squeak. We have a small problem on how to make a PluggableTextMorph read-only. The Morph shall display the log of the internal Chat. Can anyone tell me how to force him to just display the text so that nobody can write in it? Tanks a alot! Daniel Taschik - -- mail: daniel.taschik(a)student.hpi.uni-potsdam.de web: www.taschik.com mobile: +49 162 7604429 skype: danieltaschik icq: 106018852 jabber: daniel.taschik(a)googlemail.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.8 (Darwin) iEYEARECAAYFAkk9EqkACgkQo9checNKopQdhQCdGvNAboaf2OmnB9oD2VVHbKLf CuwAn2K+l9apdeieWvL5ETmeufIfO1/B =Kitn -----END PGP SIGNATURE----- _______________________________________________ Beginners mailing list Beginners(a)lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners

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Inspector instances
by Claus Kick 07 Dec '08

07 Dec '08

Hello everyone, I tried to update my Squeak image a bit. Since I wanted an uninterrupted update, I changed ReleaseBuilderFor3dot10>>loadTogether:merge: a bit, as not to throw a walkback window saying "The changes should be reviewed". Unfortunately, I forgot to comment out opening the inspector as well. Then I started the update and had dinner. I think one or two warnings kept creeping up (replacing changed classes - where can you get rid of that message btw?) So, now I have an updated 3.10 Image and a million (at least it feels as if) Inspectors open. Now, in other Smalltalks you do just that Inspector allInstances do:[:win | win close] or Inspector allInstances do:[:in | in mainWindow close]. I tried getting the SystemWindow of each Inspector instance, but sending #close to it just yields yet another walkback. How do you do that in Squeak? I spent the last half hour browsing through Morph, its Subclasses and ToolSet (trying to understand what acutally happens if you inspect an Object). Please help a poor updater :D

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Transcript usage
by Sophie (itsme213) 04 Dec '08

04 Dec '08

How do I programatically: - Find an existing Transcript window, or create a new one - View it (if it was previously docked or minimized) Thanks

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Smalltalk and coroutines
by Delyan Kalchev 03 Dec '08

03 Dec '08

Hello! According to this: http://en.wikipedia.org/wiki/Coroutine#Implementations_for_Smalltalk and other sources coroutines can be implemented in Smalltalk, but I've not had the chance to find a way to do it. Can you please help me, if you know how this can be done? -- Delyan Kalchev

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About methods and parameters
by Delyan Kalchev 03 Dec '08

03 Dec '08

I have several questions: 1. As I see parameter passing in Smalltalk is always call-by-reference, so within a method it is possible to do any "destructive" actions over the passed object. Is there a way to pass/accept a parameter as "const" so that it won't be changed in the method. 2. When we pass an object to a method, it can do anything with it, but is there a way to pass a variabe by reference and do change the passed variable. For example: i := 5. MyObj method: i. How can i be 6 after the method call. 3. Is there a way to pass a method as a parameter to another method. Thanks. -- Delyan Kalchev

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Beginners December 2008