Squeak-dev February 2010

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89 participants
595 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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OpenCL bindings for Squeak
by Josh Gargus 07 Jun '10

07 Jun '10

For the last month or so, I've been working on some OpenCL bindings for Squeak. I now have something that's worth showing to people. The code is on Squeak source at: http://www.squeaksource.com/OpenCL.html and some rudimentary installation and usage documentation is at: https://sites.google.com/site/schwaj/home/opencl-binding-for-squeak I'll write more over the weekend (hopefully in response to questions and comments), but now it's time for bed. Cheers, Josh

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Alien & Squeak FFI issues on Snow Leopard.
by John M McIntosh 16 May '10

16 May '10

Someone finally managed to fire up a Sophie app http://www.opensophie.org/ on Snow Leopard and immediately found an issue that also affects Squeak users who do fascinating things with FFI The innocent FFI call was apifstat: afileNo statBuffer: buffer <cdecl: long 'fstat' (long MacStat* ) module: 'libc.dylib'> ^self externalCallFailed Now it seems BEFORE Snow Leopard *somehow* the Squeak external primitive call api which is part of the VM to assist in loading plugins or finding function entry points in executable binaries or libraries would return the entry point for fstat by *somehow* finding libc.dylib which is via /usr/lib/libc.dylib -> libSystem.dylib -> libSystem.B.dylib Interestingly this is found implicitly since the mac carbon vm lookup logic never looks in /usr/lib/ Now in Snow Leopard it seems they do less implicit searching, perhaps a security concern? Then it fails. In the past the Unix VM would search a hundred(sic) more places, but I understand less today, but it might still work? Maybe /usr/lib is in the hit list? This issue also applies to Alien because it calls back to the VM for it to find the module and function entry point. Since I have received a request to ensure that doing an explicit full path should be allowed in the squeak carbon macintosh vm. Then a change would be: apifstat: afileNo statBuffer: buffer <cdecl: long 'fstat' (long MacStat* ) module: '/usr/lib/libc.dylib'> ^self externalCallFailed I'll look at doing this shortly. However the workaround is to go to Sophie.app/Contents/Resources and do a ln -s /usr/lib/libc.dylib libc.dylib to create a symbolic link in the Resources directory for libc.dylib since we do explicitly look for libc.dylib in the Resources directory. Obviously if you have a FFI call like above where you are calling a system library Oracle? for example. You might find it no longer works with Snow Leopard on the Macintosh, so you should check. -- = = = ======================================================================== John M. McIntosh <johnmci(a)smalltalkconsulting.com> Twitter: squeaker68882 Corporate Smalltalk Consulting Ltd. http://www.smalltalkconsulting.com = = = ========================================================================

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603 asCharacter <print it>
by hannes.hirzel 29 Mar '10

29 Mar '10

Hello I use the updated Squeak3.10.2-trunk.image as of today. 603 asCharacter gives the result as shown in the screenshot. Any suggestions? Do I need to load a Multilingual package? From where? Regards Hannes BTW Pharo 1.0beta10413 shows the result correctly in a Shout Workspace. But what is unfortunate there is that ctrl-C and ctrl-V freezes the image (on MSWindows in VirtualBox) And: The current system font in the updated Squeak3.10.2-trunk.image is really nice.

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