Squeak-dev December 2002

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173 participants
456 discussions

Projects
by Frank Shearar 07 Jan '03

07 Jan '03

Hi I've been scratching around the SqueakWiki looking for an overview type document covering what Projects are, why I'd want to use them, etc., but with no luck. If one starts up Squeak, typically one sees "The Worlds of Squeak". This is, it seems, a Project. What is a Project though? What is its intended use? If I was, say, developing two applications concurrently, would I use Projects to keep the two applications separate? Would using separate Projects to develop my different applications allow me to generate separate ChangeSets for each app? If there is overview-style documentation/tutorial stuff on Projects, where can one find it? Many thanks for any light shed on the subject! frank

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[ANN] TimeZone aware TimeStamp w/ ISO 8601 support
by tblanchard＠mac.com 07 Jan '03

07 Jan '03

Be Gentle - its my first submission and the first bit of Smalltalk I've done in years. I did this to get a time zone aware TimeStamp. That's my big contribution to this work. You can get it off the Swiki http://minnow.cc.gatech.edu/squeak/uploads/1076/TimeZoneDatabase2002- 12-21.cs and read more about it at http://minnow.cc.gatech.edu/squeak/1076 This is basically David T Lewis's TimeZoneDatabase stuff with some extra support for prompting the user to select a timezone and extra logic that only loads all the timezones when the user is prompted to select a timezone. Otherwise it only keeps two zones in memory - yours and the Zulu zone. In addition, there is a bunch of glue that consists of: * Added ISO 8601 read and write support to Date and Time. * This package also includes a modified version of the TimeStamp class that comes with SqueakMap. The new TimeStamp has been gutted and made timezone aware. It is entirely implemented in terms of PointInTime. Thus, if you change your timezone, all of your timestamps will update accordingly. TimeStamp also has support for reading/writing ISO 8601 format timestamps and consequently it is now safe to compare timestamps that were generated on different machines because they all reference the same base time. Todd Blanchard

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monticello
by Stephen Pair 07 Jan '03

07 Jan '03

After giving monticello a quick test drive, it does seem like VersionNumber would be a nice fit. It would allow you to have the option of branching the development of a package. Right now it seems that monticello forces you into reconciling differences. It would also fit nicely into your repository file naming conventions. It was nice to see that when I had 2 images connected to the same repository and I tried to commit 2 different versions of the same package that Monticello detected that situation (when I committed in the second image) and forced me to update before it would allow me to commit changes. Then, when updating, it showed me the differences in the versions of the packages. It would be great to use VersionNumber to allow branching, but still give a warning message and confirm whether or not the user would like to a) update from the repository (as Monticello does now and avoid a branch) or b) commit a branch version of the package. In my experience there is a real need for branching support. It typically happens following a major release where you need to issue minor updates while simultaneously moving the product forward for the next major feature release. - Stephen

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RE: #peekFor:, Squeak, and ANSI
by Norton, Chris 06 Jan '03

06 Jan '03

Hi Richard. Here's how Visual Smalltalk Enterprise implements #peekFor: Stream>>peekFor: anObject "Answer true if the next object to be accessed in the receiver stream equals anObject, else answer false. Only advance the stream position if the answer is true." | nextObject | self atEnd ifTrue: [^false] ifFalse: [ anObject = (nextObject := self next) ifTrue: [^true] ifFalse: [ self backupOver: nextObject. ^false]]. Cheers, ---==> Chris

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Croquet ARB_imaging
by Joshua 'Schwa' Gargus 05 Jan '03

05 Jan '03

Hi, I was wondering how to access the OpenGL ARB_imaging functions from withing Croquet. Whenever I try, I get the error "Unable to find function address". I used glGetString(GL_EXTENSIONS) to verify that GL_ARB_imaging is supported. I thing that the problem is the opengl32.dll doesn't provide the appropriate hooks (stupid Microsoft), even though NVIDIA's driver implements the functionality. I tried substituting the library "nvoglnt.dll" for "opengl32.dll", because the "strings" command told me that glMinMax appeared in the former file, which is part of the NVIDIA driver. This didn't work either, which isn't surprising, since it was basically a guess. Other ideas? Joshua

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[FIX] ClassCommentVersionsBrowser fix
by Magistrello Alejandro (SFA) 03 Jan '03

03 Jan '03

The ClassCommentVersionBrowser was not working for all classes (ProcessBrowser is one), it was looking for a commentStamp that get lost after a condenseChanges best Regards Alejandro Magistrello <<ccvb-fix-asm.1.cs>>

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Re: Newbie question: ConstantShapeMorph?
by Bob Arning 02 Jan '03

02 Jan '03

Bill, Mostly right on in your interpretation. On Mon, 30 Dec 2002 15:40:05 -0800 Bill Spight <bspight(a)pacbell.net> wrote: >Let me see if I understand what is going on. > >> You could override the #extent: method to do something like: >> > >In resizing the morph is sent an #extent: message. We make sure the new >extent has the correct proportions. Yup. >> extent: aPoint >> >> x _ aPoint x. >> y _ aPoint y. >> (y * aspectRatio) > x ifTrue: [ >> x _ y * aspectRatio >> ] ifFalse: [ >> y _ x / aspectRatio >> ]. >Doing it this way makes for the greater extent, which is faster when >expanding. I could easily have picked smaller rather than greater. Since it wasn't specified, I flipped a coin. > >> ^super extent: (x@y) rounded >> > >x@y is rounded because drawing requires an integral number of pixels. I think the low-level stuff mostly handles non-integers, but there are at least a few places where fractional coordinates have caused problems for me before, so I tried to be sure the code would run without actually running it. >Sending this message to super avoids the extra processing if it were >sent to self. (And also avoids an infinite loop when rounding). Well, the infinite loop is "the" issue here. If the last line were ^self extent: (x@y) rounded you would be in for a long wait (as in "How long does it take a proton to decay?"). Cheers, Bob

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[BUG] Mac-VM 3.4.0Beta2 crashes
by Marcus Denker 02 Jan '03

02 Jan '03

Hi, The newest Mac VM (Squeak 3.4.0Beta2) crashes when I try to turn "full screen" on. Does anyone else has the same problem? This does not happen with every image, but if it happens it is reproducable. (I have saved one of those images and I could upload it somewhere) The Crash-Reporter log is attached. Marcus -- Marcus Denker marcus(a)ira.uka.de -- Squeak! http://squeak.de

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Question about change set 5051u62, regarding #classComment:
by Nevin Pratt 02 Jan '03

02 Jan '03

In change set 5051u62, the implementation of ClassDescription>>classComment: was changed from: classComment: aString ^ self classComment: aString stamp: '<historical>' to classComment: aString aString isEmptyOrNil ifFalse: [self error: 'class comment set without stamp']. ^ self classComment: '' stamp: 'ignored' This change effectively breaks Squeak from being able to file in VisualWorks 3.0 chunk format fileins. I have found the interoperability for fileins between VW and Squeak to be very useful. In fact, my Squeak GLORP port just uses the VW GLORP filein directly. But, this change broke that ability. So, what was the rationale for making that change in Squeak? Is there any chance we can get it set back to what it was? Nevin

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[BUG, BobsUI] Drag and Drop Browser Support broken in bobsui3a
by Ken Causey 31 Dec '02

31 Dec '02

File BobsUI3a into a vanilla 5156 image and enable browseWithDragNDrop. Open a browser and drag from any of the PluggableListMorphs and drop the item back into the originating PluggableListMorph. A StringMorph is left behind. Additionally I'm seeing behaviour with StarBrowser (if you file it in of course) where the far left tree display now changes selection based simply on mouse movement with no mouse down or up required. Note sure how closely these are related but they are coincidental with the filing in of BobsUI3a. Ken Causey

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