Squeak-dev October 2004

squeak-dev@lists.squeakfoundation.org

156 participants
313 discussions

Metaclass JVM programming
by Claus Spitzer 02 Nov '04

02 Nov '04

Greetings! I am implementing a Java VM in Squeak, and am trying to figure out how to represent Java concepts in Smalltalk. Here's the idea I had so far: 1) Create Squeak classes for everything that needs to be represented (e.g. JavaClass, JavaInterface, &c.). 2) Instances fo these classes would be Java classes. So if Java had class Foo, then Foo would be an instance of the JavaClass class. These would have to be, I assume, singletons. 3) Instances of instances... ? Now this is where I thought of metaclasses. I recall that in the first Smalltalk paper I read it was mentioned that all Smalltalk classes are instances of their respective metaclass, and that metaclasses are in turn instances of metaclass-class. So I was hoping to change 1) to be metaclasses... then 2) would be classes, and instances of these would be, well, instances. Is this feasible? Or would it be possible to make the instances of the classes in 1) behave like classes in turn (that is, make instances of the instances in 2) )? In short, I'm thinking of 2 solutions to the problem presented above: - To make a metaclasses for the Java concepts. While this makes it easier for me an those I work with to wrap our heads around, it seems like a waste (Since in that case the Java classes would each be represented by a Smalltalk class). - To have instances of a class behave like classes themselves. This feels 'more right', but I'm afraid that I'm not experienced enough with Squeak to know how this is to be done (and if it is even possible). Could anyone give me some hints regarding this (perhaps direct me to the right paper/site covering these topics?). Regards.... -CWS

2 1

Re: Tabbed text morphs
by Chris Muller 01 Nov '04

01 Nov '04

Hi Brian, I remember seeing some tabbing support built into Morphic. I'm working on a UI utility in Morphic and ended up wrapping a TextMorph with my own "EntryFieldMorph" objects that end up controlling the TextMorph for me. It was easy-enough with Morphic to implement EntryFieldMorph>>#handleKeystroke: and check the incoming KeyboardEvent's keyCharacter for Character tab, as in.. handleKeystroke: aKeyboardEvent | keyPressed | aKeyboardEvent wasHandled ifTrue: [ ^self ]. keyPressed _ aKeyboardEvent keyCharacter. keyPressed = (self preferred: #keyForFocusShift) ifTrue: [ ^self shiftFocus: aKeyboardEvent ]. keyPressed = ... I don't see any harm in case-logic for checking hot keys.. A one liner to shiftFocus: aKeyboardEvent hand newKeyboardFocus: self nextTabStopMorph

7 13

[BUG] Unable to change a morph's super class to be a non-Morph when an instance is openInWorld
by Thomas Koenig 31 Oct '04

31 Oct '04

With an instance of PatchArchiveClient openInWorld, I attempt to change the class from SystemWindow subclass: #PatchArchiveClient To Model subclass: #PatchArchiveClient When I do this I get the white screen of death (The WSoD doesn't appear to produce an error log and I haven't figured out how to debug in this situation.) It shows a ***system error handing failed **** Original Error: Message not understood PatchArchiveClient>>full bounds. Debugger Error: Message not understood PatchArchiveClient>>isDockingBar:[]in DebuggerClass>>openOn:context:label:conents:fullView:{[:ex | self primitiveError: 'Oringinal error:' , title as...... It makes sense that PAC would no longer understand fullBound once it's changed from System Window to Model. The problem doesn't occur when I do not have PatchArchiveClient open, so this isn't a big deal. I'm reporting it because in Squeak I hope that I can change objects on the fly with nothing worse happeing than a Debugger Window. Wouldn't expect that anywhere else, course. Maybe changing the inheritence structure is just going too far? (This was I Squeak3.8a-63905.unstable-image but the same sort of thing happens in Squeak3.7g-5976.image. I'm runing Win XP Pro. )

1 0

Squeak and relational databases; via the plugin
by Jan Theodore Galkowski 31 Oct '04

31 Oct '04

Is there something like an ODBC interface between Squeak and relational databases? Any chance there's a native MySQL interface? Want to read up on these. Also, can these be access from the Squeak browser plugin? Or is that plugin "sandboxed" for safety and so this isn't possible? Thanks, - Jan -- Jan Theodore Galkowski (o°) jtgalkowski(a)alum.mit.edu http://www.smalltalkidiom.net

2 1

Re: Squeak for WinCE
by Andreas Raab 31 Oct '04

31 Oct '04

Hi - The best way would be to coordinate with Yoshiki who has done most of the work over the last years on WinCE. Please do NOT send anything to me - I do not consider myself the WinCE maintainer and as such I will NOT integrate anything into the current Win32 sources. Trying to stay compatible with WinCE has caused too much pain in the past - if you are interested in maintaining the WinCE branch you should get an account on SF and set up a WinCE branch (I can give you admin rights if you need them). BTW, I'm cc-ing this to Squeak-dev in case there is anyone interested in collaborating. Cheers, - Andreas ----- Original Message ----- From: "Alejandro F. Reimondo" <aleReimondo(a)smalltalking.net> To: <andreas.raab(a)gmx.de> Sent: Friday, October 29, 2004 11:08 AM Subject: Squeak for WinCE > Hi Andreas, > I have ported Squeak VM 3.7.1 for WinCE using VMMaker. > What are the steps I must follow to make this implementation the current > release of the VM? > Do you consider I must send the files (in a Zip) to you? > Please confirm me the steps because I do not want to make another page > more > on winCE porting :-) > I plan to implement also FFI, but it will take me a little because of the > assembler part of the code. > with best regards, > Ale. > ----- Original Message ----- > From: "Alejandro F. Reimondo" <aleReimondo(a)smalltalking.net> > To: "Andreas Raab" <raab(a)isgnw.cs.Uni-Magdeburg.DE> > Cc: "Dan Ingalls" <Dan(a)SqueakLand.org> > Sent: Friday, October 29, 2004 11:16 AM > Subject: Squeak for WinCE > > >> Hi Andreas, >> I have ported Squeak VM 3.7.1 for WinCE using VMMaker. >> What are the steps I must follow to make this implementation the current >> release of the VM? >> Do you consider I must send the files (in a Zip) to you? >> Please confirm me the steps because I do not want to make another page > more >> on winCE porting :-) >> I plan to implement also FFI, but it will take me a little because of the >> assembler part of the code. >> with best regards, >> Ale. >> >> >

3 2

does the Swiki address how to package a Morphic world for Web use via the Squeak plugin?
by Jan Theodore Galkowski 31 Oct '04

31 Oct '04

Hi, Does the Swiki address how to package a Morphic world for Web use via the Squeak plugin? Anywhere? Is there a documented means of limiting user interaction to that world? Thanks, - Jan -- Jan Theodore Galkowski (o°) jtgalkowski(a)alum.mit.edu http://www.smalltalkidiom.net

1 0

Re: Big Bang [Re: Proposal for Squeak 3.8 release schedule]
by SmallSqueak 31 Oct '04

31 Oct '04

Re: Big Bang [Re: Proposal for Squeak 3.8 release schedule]Hi Andreas, You wrote: > Hi Goran, > Let me try to answer your questions: [SNIP] >> 2. Is Tweak meant to be something that can work on top of official >> Squeak, or is it only targeted at Croquet? Croquet is currently not a >> "fork" of Squeak, but it may very well turn out to become one. And if >> the principal developers behind Tweak are the Croqueteers, it may >> perhaps turn into something Croquet specific. > That depends on your definition of "Squeak" and "Croquet". Some people take > the (overly simplified) point of view that Croquet is ultimately about 3D > environments but let me tell you: It is not. It is ultimately about > collaboration and communcation and there are many different ways of doing > this, some of which imply a 3D space (having the vast advantage of providing > context for the collaboration and a natural model for navigating large > spaces) and some of which don't. *All* of them, however will require a > distributed, loosely coupled, secure messaging model of replicated > computation between (mutually distrusting) objects and peers. Which is what > we internally understand as "Croquet"; a much broader, much wider ranging > collaboration architecture that includes many different areas of > communication, many different classes of devices, many different user > interfaces. (and yes, we really aren't there by a long shot but then again I > will want to have something to work on five years from now ;-) > Given that definition I can say with utter certainty that Tweak is meant to > run on top of Croquet, with "collaboration builtin". Would you please elaborate on this ? What is it meant by "collaboration builtin" and why does Tweak (what exactly is Tweak, anyway) depends on builtin collaboration ? [SNIP] Cheers, PhiHo. P.S: BTW, IIRC, at some stage you (on behalf of the Croqueteers ?) promised (?) that Croquet would be available as a package on SM ?

1 0

Re: Big Bang [Re: Proposal for Squeak 3.8 release schedule]
by SmallSqueak 31 Oct '04

31 Oct '04

Re: Big Bang [Re: Proposal for Squeak 3.8 release schedule]Marcus Denker wrote: > Am 14.10.2004 um 07:58 schrieb Andreas Raab: >> Hi Goran, >> >> Let me try to answer your questions: >> >>> 1. Is Tweak meant to replace Morphic alltogether in the long run? Or >>> is >>> it only replacing parts of Morphic? >> >> It is clearly intended to be a replacement of Morphic. Replacing >> "parts" makes little or no sense as it would break too many things >> that need fixing. However, we realize and acknowledge the fact that >> Morphic will stick around for a long time (similar to MVC which is >> still in Squeak) and the only thing we am working on is the ability to >> get rid of both MVC and Morphic if that is desirable (which it will >> for packaging purposes but not for a long time as most of the tools >> are available for Morphic). > The tools are in Morphic now, but porting them to Tweak is quite simple. Is there any other reason not to drop both Morphic and MVC now ? >> I think the best way to describe the *current* relation between >> Squeak, Croquet and Tweak is to say: Squeak is being used by both. >> Both systems have a set of requirements which are met by Squeak - >> mostly that of having a fairly simple late-bound object system with >> good programming tools and -most importantly- the ability to change >> everything top-to-bottom. I fully expect to port both forward to the >> next Squeak release which contains m17n (again "using" Squeak) but >> whether that's going to stay that way is a different question. >> > I'm quite sure that if there would be a TeaTime enabled tweak based > system (using that new VM stuff), I would use it for all my work. > As would most other people, I guess. For me, Squeak was and is about > moving forward. Not implementing the past. > So at that point, there would just be no "next release" of Squeak in > the sense of today's Squeak, as everybody would be contributing to the > new system. > (Of course, this is just playing with words: For me, "Squeak" never > meant the hack based on St80 we have now, but a vision for a new system > of the future). > One thing (and that is really important): It would be good to have some > idea of how and when this transitions will happen. Will it be a hard > switch or a gradual transition? If we all know that we will use "the new > thing" it would be nice to be able to put work into that at some point > instead of something that later does not get used. (e.g. the harvesting > I do is mostly completly not relevant for me personally. If I would put > as much work into another release as I did in 3.7 and 3.8, and later nobody > uses it, that would not be fun. > Of course, just stopping "because there will be something > better in the future" is not the right thing, either. Not doing the > trivial improvement because a better one might come in the future is a > great way of making sure that nothing happens at all. Somehow, I lost the respond from the Croqueteers on the issues that Marcus raised. Cheers, PhiHo.

1 0

Re: Big Bang [Re: Proposal for Squeak 3.8 release schedule]
by PhiHo Hoang 31 Oct '04

31 Oct '04

1 0

[ANN][SM] TimeZoneDatabase V1.2.2 released
by David T. Lewis 30 Oct '04

30 Oct '04

TimeZoneDatabase V1.2.2 Integration of the time zone database with Squeak Kernel-Chronology. Version 1.2.2 adds class TimeZoneProxy, which provides TimeZone protocol for the local time zone transform in a TimeZoneDatabase. This permits methods such as DateAndTime class>>now and Time class>>now to obtain the correct time zone offset for any PointInTime, with compensation for daylight savings time and other peculiarities. Rather than relying on a static definition of the time zone, expressions such as 'DateAndTime now' and 'Time now' will perform a dynamic lookup into the time zone database to determine the time zone offset. When daylight savings time takes effect, the time zone database will automatically compensate for the change. Also, time zone offsets can now be expressed as Durations, as in: TimeZoneDatabase systemDatabase durationFrom: 'America/Detroit' to: 'Canada/Newfoundland' ==> -0:01:30:00 Here is how to load a time zone database and set the default time zone on a Squeak image running on a typical Linux box: 1) Build a system database from files in the /usr/share/zoneinfo directory (a typical location for a Unix/Linux system). TimeZoneDatabase buildSystemDatabaseForSqueak 2) Look for a suitable time zone to use. For example, if you live in Detroit, Michigan in the USA, you can find several valid time zone entries for Detroit by evaluating the following expression: TimeZoneDatabase systemDatabase grepFor: 'Detroit' 3) Select a time zone to use as your default. For example, if you have decided to use 'America/Detroit', tell the database that this should be the default: TimeZoneDatabase systemDatabase defaultLocation: 'America/Detroit' 4) Now tell Squeak to use this as its dynamic time zone setting. TimeZoneProxy setDynamicLocalTransform: TimeZoneDatabase systemDatabase defaultTimeZone abbreviation: 'EST' - Dave

1 1

Jump to page: