Squeak-dev November 2007

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142 participants
155 discussions

veryDeepCopy, ImageSegments, and actionMaps
by Ned Konz 17 Aug '23

17 Aug '23

Any Object can have dependents whether or not it has an instance variable to keep track of them (these are kept in the DependentsFields class variable of Object). The only class that keeps its own dependents is Model. Any Object can have an actionMap. These are supplied by EventManager class by default, and are stored in the ActionMaps class variable of EventManager. The only class that keeps its own action maps is Morph. When we veryDeepCopy an object we also copy the global dependents (see DeepCopier>>fixDependents). However, we don't copy the actionMap in those cases where it's held by the EventManager class. When we file out an object that uses DependentsFields out into an ImageSegment, we also file out the dependents (see ImageSegment>>dependentsSave:) if it's in a project. We do this by adding a project parameter called #GlobalDependentsInProject. However, we don't file out the actionMap in those cases where it's held by the EventManager class. My question is this: should we fix these behaviors (copying and serialization) to include these "global action maps" just like we already include the "global dependents"? Or should we discourage the use of the "global action maps"? -- Ned Konz http://bike-nomad.com GPG key ID: BEEA7EFE

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find original change set
by Javier Orsaria 09 Mar '21

09 Mar '21

Hi, I was trying to use, in VersionsBrowser, the feature "find original change set" for a method. In old versions (3.8 and earlier) this work fine. But in 3.10 and 3.9 don´t. I followed the sequence and detect the problem at MethodChangeRecord-noteNewMethod: noteNewMethod: newMethod "NEVER do this. It is evil." currentMethod _ nil. should be: noteNewMethod: newMethod "NEVER do this. It is evil." currentMethod _ newMethod. This way work as I expect. But with that comment I understand was intentioned. What is the problem with this? I can´t see it... I'm the devil? Thanks, Javier

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app in app
by Chuck Smith 31 Jan '18

31 Jan '18

Dear Squeakers, I have always had a hard time learning anything until I had a project to do it around. Well that time has come. I need to write an app. that will let me run one application inside another. I would like to have a cad type app. running in a window and then be able to over lay that cad app. with another app. that lets me put hot spots on the cad app. These hot spots will have the ability to show a colored outline around their perimeter. That outline we would like to be able to turn on and off or make blink. The purpose of the hot spot is to train people how to use the cad app. by showing them where to pick menu items and enter data etc. So the whole things runs like this, we start the cad app. and the tutor app. The tutor app. step by step shows the student where and what bottoms to pic and where and what data to enter. As they enter etc. the app. actually functions and they are able to create in the cad app. Kind of a training wheel effect. Can any one tell whether or not I could do this in Squeak and kind of help me do it. I do have a nephew who is a good programmer but has never used Squeak of small Talk and I would like to get him help me do this app. start using Squeak. Can any one point in the right direction? I would like to do the same thing for learning Squeak. Once we learn how to do it for the cad app. I will do it for the Squeak community and make it free. Sincerely, Chuck Smith

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Trying to build SerialPlugin for IrDA under MPW (MacOS 8.6)
by Hans-Martin Mosner 24 May '12

24 May '12

Hi, I recently got a serial IrDA adapter and wanted to play around with it under Squeak. This adapter has a baudrate switching mechanism which depends on toggling the DTR and RTS lines in the correct sequence. To support this, I wanted to build a new SerialPlugin with an additional primitive. However, the plugin as built with MPW does not seem to be accepted by the VM, which still uses the internal plugin in all cases. I've tried placing the plugin in a 'Plugins' subfolder of the VM's folder, and then directly into the VM folder, without any success. I have considered placing debug outputs in appropriate places in the VM, but building a complete VM with MPW is not easy - I would have to create an MPW makefile for the whole shebang, which is more work than I can invest at the moment. Does any of you Mac aficionados have an idea where the problem could be? I have appended the plugin and corresponding source files in a ZIP file (it's not big) so if you want to try it out you could do it right now :-) BTW, would it make sense to incorporate support for switching serial port parameters of an open port into the standard plugin? Closing and opening a port just to change the baud rate seems a little overkill... Cheers, Hans-Martin

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Squeak download stats?
by Thomas A Petersen 27 Feb '11

27 Feb '11

Greetings, FWIW, I download beta/gamma versions about once a month to test. Those that prove stable get my influx of current work for day to day use. I download the official version and move to it if it proves stable for my uses until about the middle of the next beta cycle. I also have a couple of friends that I pass the stable specialized images on to about once a year. A couple of other people I know pull the distribution for Windows and/or Linux when I let them know there is an official upgrade. Thanks again for a great place to think and learn, tap

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TextMorph behavior
by Marcus Pedersén 18 Jan '11

18 Jan '11

Hi! I have been trying class TextMorph out for making an editable textfield for my GUI. One thing I can't figure out is how to make the text "grow" horisontaly when you write instead of verticaly. I am after the behavior similar to the spotlight search text field in mac. If you write loads of text the oldest text "dissapear" (visualy) on the left hand. I have tried autoFit: false and wrapFlag: false without any desired results. Doesn't TextMorph contain this functionality from start? Do I need to subclass and write the function from scratch? Many thanks in advance! Marcus

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Unicode strings, benchmarks
by Janko Mivšek 01 Jan '11

01 Jan '11

Hi Squeakers, I already extended String with TwoByteString and did a "scaling" with auto conversion to wider string when a wider character is put into a string. So far so good and this already works in Aida/Web. I also did a bit better UTF8 conversion but is only 25-80% faster that existing one in UTF8TextConverter. To prepare for even better results, I made a benchmark, which measure conversion time for English, French, Slovenian, Russian and Chinese 2500 characters long text. It measure 100 conversions which accumulates to 250K characters of text. Here are results in VW, Squeak with old UTF8 converter and a new one: VW old new english 30 313 248 ByteString, pure ASCII french 32 323 251 ByteString, ISO8859-1 (Latin 1) slovenian 48 578 480 TwoByteString Latin 2 russian 112 1306 720 TwoByteString Cyrillic chinese 107 1544 3825 TwoByteString Notice an exceptional 10x VW performance comparing to Squeak, and they do all encodings in plain Smalltalk! No primitives! So how come that Squeak is so slow here? Above benchmark was done on Squeak 3.9 on Suse Linux 10.1, P3.2GHz. Best regards Janko -- Janko Mivšek AIDA/Web Smalltalk Web Application Server http://www.aidaweb.si

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Loading the OpenGL package (was: Games with Squeak)
by Diego Fernandez 17 Apr '09

17 Apr '09

On 10/13/06, Andreas Raab <andreas.raab(a)gmx.de> wrote: > Edgar J. De Cleene wrote: > > Andreas, as you see no package said " OpenGL" in the provided link. > > I think you should learn a little about using Squeaksource: "Versions" Ouch! I missed the package too, because in www.squeaksource.com usually there is one MC package per "Project". Anyway, I'm trying to load OpenGL-ar.36.mcz in Squeak 3.9 but I get: Syntax Error: glBindBufferARB(target, buffer) "This method was generated by OGLExtManager" <Argument expected ->apicall: void 'glBindBufferARB' (long ulong)> Any clue on how to solve this error? (It looks that it's created with a "special" compiler) And another question... As I wrote in the previous mail I've started to do some SDL bindings. But I think that maybe it's a waste of time, since today nearly all machines have OpenGL, and Squeak already has objects to deal with sound and joysticks.... so instead of using SDL for 2D graphics is better to use OpenGL for the same thing, what do yo thing about that? Cheers, Diego

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Linux and ttyUSB0
by Jon Hylands 13 Jan '09

13 Jan '09

Hi everyone, On my current robotics project, I'm using a gumstix verdex to talk over a USB to serial converter chip (FT232) to a serial bus. My brother Dave made up a new kernel driver for the gumstix, and when I plug in the chip it registers itself as ttyUSB0. For work I've done previously on Squeak on the gumstix, I've used standard serial ports, which map to ttyS0, ttyS1, ttyS2, etc, which correspond to port 0, 1, and 2 when I open the Serial Port in Squeak. However, I have no idea which port number ttyUSB0 corresponds to... Anyone got any idea? Thanks, Jon -------------------------------------------------------------- Jon Hylands Jon(a)huv.com http://www.huv.com/jon Project: Micro Raptor (Small Biped Velociraptor Robot) http://www.huv.com/blog

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Squeak demonstrated on the Lab With Leo
by merlyn＠stonehenge.com 20 Feb '08

20 Feb '08

Yesterday, I did two Squeak-related segments for The Lab With Leo (labwithleo.com), a technology show that is shown on cable in Canada and Australia, and on bittorrent endpoints around the world with some clever googling. I talked about the OLPC Etoys image for show #149 (each show's number is shown prominently in the opening). I did the classic "draw a car and control it with a drawn steering wheel" demo. Thanks Alan, for that. For show #137, I showed the Scratch programming environment from scratch.mit.edu. I made the default cat "follow the mouse", and didn't realize until midway through that it was more anthropomorphic than I had realized. :) Of course, when I duplicated that cat, Leo Laporte uttered "copy cat", and got me laughing as well. I mentioned that Squeak powered Scratch, but didn't go into it as deep as I did for the Etoys talk. I also emphasized the community aspect, of being able to upload my stupid project and download others. I'm happy to have shown Squeak in a very public venue. This should raise the visibility of Squeak-for-kids, since this show is highly respected and watched. The episodes should air in the mid-January timeframe, so watch for them. If someone could help me get into Croquet a bit more, I'm being asked for topics for February already. (nudge!) -- Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095 <merlyn(a)stonehenge.com> <URL:http://www.stonehenge.com/merlyn/> Perl/Unix/security consulting, Technical writing, Comedy, etc. etc. See PerlTraining.Stonehenge.com for onsite and open-enrollment Perl training!

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