Beginners May 2008

beginners@lists.squeakfoundation.org

54 participants
58 discussions

How to remove a method programatically
by Rob Rothwell 21 May '08

21 May '08

Does anyone know a good way to remove a method from an object programatically? For example ArbitraryObject removeMethod: #method1. There are many "...Refactory...." or "...Refactoring" objects out there, but I can't seem to figure any of them out... Rob

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Re: [Newbies] Algernon Default Browser
by Rob Rothwell 21 May '08

21 May '08

Thanks...now I at least know how to open a browser programatically! Rob On Wed, May 21, 2008 at 3:16 AM, Torsten Bergmann <astares(a)gmx.de> wrote: > Rob wrote: > >Does anyone know where/how to change the default browser used when you > >select a class with Algernon? It seems to use the standard System Browser > >regardless of the default browser I have chosen. > > Looks like Algernon uses the "Browser" class hardcoded on various places > like Algertype>>openInExistingBrowser, Alertype>>openInNewBrowser: and > Algernon(class)>>existingBrowser > > Replacing this with "SystemBrowser default" does not help since the OB > Framework is not full compatible with the old browsers in all places (since > it uses adaptors) - so it's not easy to find an existing browser by > comparing the model. > > Maybe Algernon should use the ToolSet class to open the browser in future > releases: > > ToolSet browse: String selector: #asCharacter > > Bye > Torsten > > > -- > Psssst! Schon vom neuen GMX MultiMessenger gehört? > Der kann`s mit allen: http://www.gmx.net/de/go/multimessenger >

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Quick noob snippets
by Sven Schott 21 May '08

21 May '08

Hi all Just a quick couple of questions (nothing serious). I was going through the SBE and came up on OrderedCollections. I tried the following: c := OrderedCollection newFrom: { 1. 5. 8. 45. 23. 3. 20 }. String newFrom: c but I get the following: 'Error: Improper store into indexable object'. What I was expecting was: 1584523320 (because in Ruby world I can do something like this:) irb(main):001:0> [1,2,3,4,5,6,7,8].to_s => "12345678" irb(main):002:0> I was at least expecting something weird but not an error. I eventually figured that it was because I was using Ints instead of Characters because this works fine: str := OrderedCollection newFrom: { $a. $g. $t. $e }. str as: String So, the question is why do I get the error? Shouldn't String be able to convert any object into a String representation? In Rubylandwhere that's all fair game but I get the feeling that you can't just do that since it is String doing the conversion by (possibly) sending a message that OrderedCollection does not support. If that's the case, how do you do it? The second question is kinda stupid. I was playing around with the browser in Squeak (I had just learned how to open Morphs in the World. Yay!) and tried this: anEllipse := EllipseMorph new. anEllipse defaultColor. anEllipse openInWorld anEllipse color: Color red anEllipse borderWidth: 10 anEllipse height: 100 100 timesRepeat: [randomNo := 100 atRandom. anEllipse height: randomNo. anEllipse borderWidth: anEllipse borderWidth + 1 ] It did work but it did the moves all at once. At first I thought that it was just doing it so quick I couldn't see but I increased the number of iterations but all that did was hang the UI for a sec or so and then leave the ellipse at a random location (as expected). I guess I was trying to animate it but the UI doesn't update. Is it a block thing? That is, is it that the block is evaluated and then the UI is updated? Just curious. I'm probably trying to do this in a rather silly way. Anyhoo, that's it. I'm loving it so far and I've ordered the Seaside book from Lulu. Even if I don't ever get to use this officially in my work, I'm glad I found it because I will now be able to write tools very quickly and easily AND move them between platforms with a quick scp or anything else for that matter.. Sven

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Algernon Default Browser
by Rob Rothwell 21 May '08

21 May '08

Does anyone know where/how to change the default browser used when you select a class with Algernon? It seems to use the standard System Browser regardless of the default browser I have chosen. Thanks, Rob

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EventHandlerPlus and mouseOver
by Enno Schwass 20 May '08

20 May '08

Hello I am using Morphic to display some geographical maps. For easier testing, I would like to see the current position of the HandMorph as LabelString at the bottom of the map window. But I have to dig deep into morphic event handling to do this. At least I am unable to figure it out. I found the class EventHandlerPlus that might help here. Could you provide some informations about that? Thanks Enno --

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audio query
by Kenneth Sherwood 20 May '08

20 May '08

As a writer and non-programmer (high school Fortran in 1986) who has used out-of-the-box tools such as flash and dreamweaver, I've just begun teaching myself Squeak--which was recommended by a hypertext writer/aquaintence Jim Rosenberg. My interest is in building interactive text / audio projects and live-art-performance tools in a user-defined workspace apart from the constraints/habits associated with Flash and Director, and without the platform dependence and proprietary concerns. I've gathered what seem to be the "classic" beginner texts: Squeak: Learn Programming with Robots, Squeak: A Quick Trip to ObjectLand, and Squeak: Object-Oriented Design with Multimedia Application (Guzdial). Can anyone speak to the multimedia potential of Squeak and/or its likely development trajectory, especially with regard to audio? The midi tools and synthesis look promising, but as I've mostly worked with recorded voices, I was worried to see no apparent support for compressed audio. Most of my searching in the news-groups has turned up dead-ends, like the tool called "Siren" that is now written for a different smalltalk dialect. I see the Guzdial now seems to be publishing books on Python and Java as "multimedia" languages, and I sense much development work must be going into Croquet. So in short, can someone with experience using squeak in a multi-media presentational format, especially audio, reassure me that what will be the somewhat steeper learning curve (for a self-taught, non-programmer) will pay off? Many thanks... Ken __________________________________ Kenneth Sherwood, PhD Associate Professor of English Graduate Program in Literature and Criticism 110 Leonard Hall Indiana University of Pennsylvania Indiana, PA 15705 www.sherwoodweb.org

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Easy way to override a method?
by Tim M 17 May '08

17 May '08

Is there an easy way in Squeak to override a method? I have created a subclass of a class, and am viewing my subclass in a hierarchy browser. I have clicked on the superclass in the browser and am browsing methods to see what I need to override. Having discovered a method that I want to override - I was hoping I could right click on that method and select Refactor|Override - but its not there (it is in Dolphin). Failing this I tried drag and drop - but that seems to just move the method (I held the Control key while dragging but I guess thats a Dolphin and a windows thing). Is there some way to easily and quickly do this without having to cut and paste? Tim

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[ANN] MorphicWrappers&MathMorphsinto3.10
by Edgar J. De Cleene 17 May '08

17 May '08

I add http://wiki.squeak.org/squeak/6050. For people I advice hit the load updates button and advance your image to Squeak3.10-7164-basic.image, so you have the last minute fixes, look enh, etc. The Diego Gomez Deck friendly bar you see in page pict could be activated going to Preferences, docking bars and changing the preference to on Cheers Edgar

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New edition of Squeak by Example using dedicated image
by Oscar Nierstrasz 16 May '08

16 May '08

Hi folks, Several people have complained about being confused when the hands-on examples don't work as described in various images. We have attempted to address this problem by providing our own dedicated image, available from SqueakByExample.org. This image has been specially prepared by Damien Cassou, and is a slight variant of the final 3.9 squeak-dev image. (Most of) the figures and exercises have been adapted so they really should work exactly as described in the latest revision (2008-05-15). We would be happy for feedback in case any further errors are found. (Please use the discussion list mentioned on the book's web site.) Thanks to one and all for the very positive feedback so far, and your patience with errors and oversights. Oscar Nierstrasz

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How to put a block into an Array
by David Finlayson 16 May '08

16 May '08

Newbie here, working my way through Guzdial's Squeak: Object-Oriented Design with Multimedia Applications (2001). One of the exercises requires building an Array with a block of code as an element, the idea is to lookup the stored block in some way and execute it. But, how do you store a block of code in an Array? For example, I can do this: [Transcript show: 'a message'] value But I can't get this to work: myArray := #([Transcript show: 'a message']). (myArray at: 1) value The reason is that (myArray at: 1) doesn't recognize the stored object as a block. Inspecting it shows the odd symbol: #[ ?? Can someone get me back on the clue train? Thanks, David

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Beginners May 2008