Beginners April 2010

beginners@lists.squeakfoundation.org

36 participants
42 discussions

Is there a tandard way to attach context menus
by Herbert König 04 Nov '11

04 Nov '11

Hello all, is there a standard way to attach a context menu to a morph? It's fairly easy to do by checking for yellowButtonPressed and manually firing up a MenuMorph. But it is sufficient to implement #addCustomMenuItems:hand: to get an enhanced Halo menu while #addYellowButtonMenuItemsTo:event: and #hasYellowButtonMenu don't help. So is there a predefined way without everybody doing his own? Thanks, Herbert mailto:herbertkoenig@gmx.net

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Omnibrowser help
by Rob Rothwell 14 Aug '11

14 Aug '11

Are there some tips/documentation somewhere on getting the most out of the OmniBrowser? The MulitpleSelection browser looks interesting (sort of like the tabbed browser in VisualWorks), but I don't quite understand its behaviour and what method it decides to show in which pane when you move around or save changes. On the same topic, can anyone point me toward how I could add a new item to the class context menu in the OmniBrowser? I want to add a new template selection menu item (like "new class template" and "new trait template") because I have created a method that creates TWO classes at the same time for an Aida application (A domain model class AND its associated WebApp class). Thanks, Rob Rothwell

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[Newbies] Pre-Getting started info: Unicode, utf8, large memory need
by Charles Hixson 21 May '10

21 May '10

Squeak looks interesting, but before getting started I need 3 pieces of info: 1) How does one read&write utf8 files? 2) Can strings by indexed by chars, even if they are unicode rather than ascii? 3) What happens if you have more data than will fit into RAM? (For 3 "use a database" is an acceptable answer, but I'm hoping for something involving automatic paging.) (For 2 "use 4 bytes/char" is acceptable, but only if there's a good answer to 3.) I thought I could just look this up in the documentation, but it doesn't seem to address these points...at least not until you start being able to read the code in the browser fluently. These questions also don't seem to have been addressed in the mailing list before. (At least a search didn't find them.) An additional, but much less urgent, question is "How does one use Squeak on multiple cores of a multi-core processor?"

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ProcessWrapper
by pascal.vollmer＠nexgo.de 11 May '10

11 May '10

Hi, A question about ProcessWrapper. I use ProcessWrapper to execute a Windows-application from Squeak. Everything is fine and reproducible as far as I activate this message sequence in the Workspace: ProcessWrapper new useStdout; startWithShellCommand: 'path_to_executable\executable.exe'; upToEnd; waitForExitFor: 5000; exitCode. As soon as I integrate the same stuff in a method, the image crashes. When I debug the situation I see that the crash occurs while performing ProcessWrapper>>upToEnd. Any clue what could be the problem here? Or how to investigate further? Kind regards, Pascal Pascal Vollmer Email: pascal.vollmer(a)ieee.org Traumziele - von Beschreibung bis Buchung jetzt kompakt auf den Reise-Seiten von Arcor.de! http://www.arcor.de/rd/footer.reise

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Programmatically simulating drag and drop
by DeNigris Sean 02 May '10

02 May '10

Does anyone know how to simulate drag and drop? I managed to pick up a morph via HandMorph attachMorph:, but I can't get the cursor to move (tried position: and a few others). Thanks. Sean DeNigris

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How to draw a single pixel with permanence?
by Lawson English 01 May '10

01 May '10

I'm trying to go back to beginnings with my own ManelBrot morph because I can quite grok how the one I have works. Mostly because I still dont grok morphs. Example: I'm trying to plot points on a morph using the drawOn message below: drawOn: aCanvas "Draws the receiver on the given canvas" super drawOn: aCanvas. aCanvas form colorAt: 30@30 put: Color black. BUT, with or without the evocation of super drawOn, I can't get the point to stay around. It only draws during a drag. What is the pattern for this. I've looked at much code and many tutorials but they all seem to gloss over this little detail, or at least my eye skips it every time I look at all the examples I can find. Lawson

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Squeak 4.1, Package Universe Browser, squeak web packages 0.2, fails on installing SUnit
by Jonathan Wright 29 Apr '10

29 Apr '10

Hello, I get the following error message while trying to install squeak web packages 0.2, particularly on the SUnit install: TestCase class(Object)>>doesNotUnderstand: #methodChanged: WeakMessageSend>>valueWithArguments: I've attached the screenshot of the exact error. I am still new to squeak and am not sure how to debug this. I assume SUnit is missing the methodChanged method? This does install properly on Squeak 4.0. Thank You, Jonathan

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Re: [Newbies] Pre-Getting started info: Unicode, utf8, large memory need
by Paul DeBruicker 29 Apr '10

29 Apr '10

I think you might benefit from looking at Gemstone, especially the free version. You haven't mentioned the total size of your planned DB, but up to 4GB is free. After that you pay but its sufficient to prove what you're doing. They seem to have the features you're looking for. See: http://seaside.gemstone.com/ for their free version. They have a mailing list here: http://seaside.gemstone.com/mailman/listinfo/beta > Message: 7 > Date: Thu, 29 Apr 2010 11:26:41 -0700 > From: Charles Hixson <charleshixsn(a)earthlink.net> > Subject: Re: [Newbies] Pre-Getting started info: Unicode, utf8, large > memory need > To: "A friendly place to get answers to even the most basic questions > about Squeak." <beginners(a)lists.squeakfoundation.org> > Message-ID: <4BD9CF61.1050101(a)earthlink.net> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > On 04/28/2010 09:31 PM, Herbert König wrote: > > Hi Charles, > > > > seems you are on top of things. So just a few remarks. My experience > > is from Squeak 3.8 so you should check if what I say holds true for > > current Squeak. > > > > Check out the UTF8 speed. I combine tab delimited files from > > disparate sources into more complex objects and write out new > > files. First thing was to change to non UTF8 for speed reasons. > > Seems you can't do this. > I'm not worried about speed for this first part, and for the > follow-up I'm more worried about computational speed than utf8 > reading speed. If I can't depend on virtual memory and automatic > roll-in/out (nobody seems to offer that!) then it means LOTS of > database interaction. Which is where I get worried about Magma...as > apparently it holds a partial reference to everything in RAM. > > CH> I looked at Magma, and couldn't figure out whether it would be > > CH> useful or not. I've no idea just how fast it is, how capacious > > CH> it is, or how much > > > > Chris Muller is on Squeak dev and I'm sure he will be able to tell > > you if you would hit the limits of Magma. Gjallar (www.Gjallar.se) > > uses Magma in a commercial project (last time I looked). > > > > CH> ahead of time. And I want locally separate files, so I guess > > CH> I'd probably use sqlite or Firebird. With Sqlite I might need > > CH> to have multiple databases to handle the final system, so it > > CH> would probably be best to partition things early. (Either that > > CH> or build some sort of hierarchical storage system that rolled > > CH> things from database to database depending of how recently it > > CH> was accessed.) > > > > SqueakDbx or (openDbx in other languages) might be of interest. I > > use mysql from Squeak in a commercial setting, no problems. > > > That is of interest, but MySql is in the same boat as PostGreSQL with > having a system level database rather and separate database files. > This makes many of the uses that I intend problematical...and > difficult at best. Both Firebird and Sqlite, however, allow > specified db files. Sqlite is more common, so that's probably what > I'll choose, even though Firebird has a reputation for being more > efficient. (However I think both are supported by openDbx, so > probably also by SqueakDbx.) > > CH> I'm guessing that FileStream would handle file BOM markers > > CH> gracefully. (Most of my files are utf8 with BOM markers at the > > CH> head.) This isn't > > > > Just try it to be sure.. > > > Yeah, that will be a part of the first test. > > CH> (I wouldn't need any fancy mapper. If I weren't dealing with > > CH> LOTS of variable length arrays of variable length strings, I > > CH> could just fit the data into a simple C struct without any > > CH> pointers whatsoever. So all I need is to be able to save a > > CH> list of lists of chars, plus a few integers that would all fit > > CH> comfortably into 32 bits. [Many of them would fit into 8 > > CH> bits.]) > > > > CouchDB has caught my attention for inhomogeneous data, scalability, > > replication. But then I consider javascript a nice functional > > language and I like JSON (available in Squeak). At least look at > > map reduce algorithm for being able to utilize multi-core or > > multiple boxes. Whatever language you choose. > > > Multiple boxes isn't particularly interesting, but I'm expecting the > number of cores/box to ramp up quickly over the next decade...and > that *is* interesting. > > CH> later, and D doesn't have much in the way of concurrency > > CH> handling. I'm not sure that Hydra counts...though it sounds > > CH> like I need to look into it. The question would be how to > > CH> programs running on separate virtual machines communicate with > > CH> each other. > > > > Two different issues, Hydra addresses one single machine and does > > not support current Squeak (recent discussion on Squeak dev). The > > other issue is communicating via network. This is where you'll end > > up. > I don't expect to end up "communicating via network", except, > perhaps, via localhost. But I do expect to end up running several > processes, probably on different cores. This causes many, but not > all, of the same problems. (Current support is less important, as > this is something a bit off in the future. But it needs to be > planned for now, before I start writing the code.) Guess I'll see if > I can find that "Squeak dev" discussion. Perhaps Dbus is the correct > answer...I've only skimmed over its specs, but it looks plausible. > (Getting info back from separate processes seems a major problem with > most of the approaches. It may well turn out that TCP over > UnixSockets is the best approach available..though I *would* like > something better.) > > > ------------------------------ > > _______________________________________________ > Beginners mailing list > Beginners(a)lists.squeakfoundation.org > http://lists.squeakfoundation.org/mailman/listinfo/beginners > > > End of Beginners Digest, Vol 48, Issue 34 > *****************************************

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Video Media in Squeak
by Bruno Giacomelli 28 Apr '10

28 Apr '10

Which are the best classes to manipulate video media in Squeak? I'm planning to make a little video player application with Squeak and didn't find nothing really useful at Google (I'll try harder). Thanks in advance! Bruno

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Re: Is there a reason why this RadioButton group doesn't ever call the callback?
by Andy Burnett 28 Apr '10

28 Apr '10

John McKeon wrote <<< You probably don't want that if you have other inputs on the form anyway. You really should be posting this to the Seaside list as well. You would probably have your answer by now. John >>> Thanks John, I will move it over to that list now. My assumption was that it was a very basic mistake on my part. However, it seems as though it may be more complicated than that. Cheers Andy

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Beginners April 2010