Squeak-dev March 2002

squeak-dev@lists.squeakfoundation.org

169 participants
610 discussions

[ENH] Morph path stepping
by olmeca＠netscape.net 04 Mar '02

04 Mar '02

Hi there, here's a little improvement to the functionality of moving morphs along a path. Background Using E-Toys tiles you can instruct a morph to move along a path which you can define using the morph's menu 'extra's.../ draw new path', using the command tile 'followPath'. Enhancement The move along the path is performed atomically: you can't make two morphs follow their paths at the same time; first one will make its dance, then the other. I've now added a command tile called 'stepOnPath' which uses the stepping mechanism for the move along the path. With this extension multiple morphs can move together, each following its own path. Rudi Angela -- __________________________________________________________________ Your favorite stores, helpful shopping tools and great gift ideas. Experience the convenience of buying online with Shop@Netscape! http://shopnow.netscape.com/ Get your own FREE, personal Netscape Mail account today at http://webmail.netscape.com/

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Re: How do you print?
by Richard A. O'Keefe 04 Mar '02

04 Mar '02

Jeff Bowman <jeff(a)dvns.com> wrote: Yeah, I've been thinking about doing something like this until I figured out the print thing. Just for my edification, what is OSProcess and it's importance in the current discussion? (I'm still learning a lot) Quoting some old mail (October? 2000): OSProcess provides access to the external operating system from Squeak. A plugin is provided for Unix (and Linux) systems. Placeholder classes are provided in the OSProcess hierarchy for other operating systems (Windows, Mac, OS/2), but support for these systems is not yet implemented. My understanding is that a Windows version _does_ exist now and will soon be working well enough for general release. There's a "shell" layered on top of the Unix version.

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[FIX] ScrollbarOnRightAgain-dew
by dway＠riskmetrics.com 04 Mar '02

04 Mar '02

from preamble: "Change Set: ScrollbarOnRightAgain-dew Date: 3 March 2002 Author: Doug Way Reverts the 4722fixScrollbarOnRight update, since that caused problems with morph lists being reordered and windows coming to front when they shouldn't. This reimplements support for displaying flop-out scrollbars on the right by reordering the pane morphs in the SystemWindow, during window creation."!

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Re: InternetConfiguration
by Lex Spoon 03 Mar '02

03 Mar '02

Michael Rueger <m.rueger(a)acm.org> wrote: > > > Lex Spoon wrote: > > > Let's step back a moment. This list of info is a really simplified view > > of a person's Internet existence. I use two different IRC servers, and > > 2 POP servers. I have 2 email addresses that I use with much frequency. > > I prefer to connect to USENET by running a command, but if that's not > > OK, let's step even further ;-) > > The *really* simplified version is that all we care about is to read the > proxy settings out of the IE and the smtp host and email address out of > the Outlook registry entries ;-) > If someone is so sophisticated to actually use IRC, mail and whatnot > from within Squeak, they should be able to configure it. And then we > need a way to keep the settings in Squeak, I completely agree with that. > Okay, this is what I need to hear. If we can get it down to 3-4 things that are really useful, then the implementation burden on Unix isn't bad. Reasonable settings can be found for all the things you mention. However, right now there are things like IRC servers in the list you posted earlier. Which settings are the really important ones? Also, what's the most useful way to lie in each case? Andreas Raab wrote: > Yes it is. And for a very good reason. What we're looking at is not > somebody like you but rather some school which will certainly sit behind > a firewall and be configured _exactly_ in this simplified way. Which schools are these? Such people will frequently have both a school email address and a home email address. Also, not every school is as authorotarian with their computers, and thus allows users to set up their account in any reasonable way they like. What's the plan when some school has a different simplified setup than what Squeak expects? Also, this configuration info is surely going to be used for something. What happens when a non-school person tries to use whatever that is? Is there a backup plan in case no simplified internet configuration is available? I don't see why Squeak shouldn't just have a manual configuration for this stuff, instead of blindly believing the OS settings or trying to dig into configuration info from other programs. And if it has a manual configuration, the simplest way is going to be to do it in Smalltalk, not C. Is it really any simpler to have some site-specific C code to guess a person's settings, than to give each user their own image or image segment with the right configuration already set up? So in summary: 1. Which settings are the important ones? 2. What are they being used for? This is important for knowing the best way to lie when the truth doesn't fit into the simplified scheme. Also, out of curiousity, in practice which of these settings to Macintosh apps actually listen to? How about MS Windows apps, with it's internet configuration thingie? -Lex

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[ANN][Goodie] SoapOpera0.5 beta1 (now with ORB wrapper)
by Masashi Umezawa 03 Mar '02

03 Mar '02

Hi, SoapOpera 0.5 reached to the beta state. Please check it out. http://www.mars.dti.ne.jp/~umejava/smalltalk/soapOpera/index.html In this version, ORB wrapper (Opera) is included. It is yet another Remote Smalltalk. http://www.mars.dti.ne.jp/~umejava/smalltalk/soapOpera/operaORB.html Opera provides very simple API for distributed computing. You never mind about SOAP, when using OperaORB. " Server side:" OperaORB root at: #blobMorphInServer put: BlobMorph new. "Client side" morph := OperaRemoteObject name: #blobMorphInServer host: 'your server host name'. morph openInWorld. The ORB wrapper was basically ported from SoapOpera0.2. No additional features for now. But the ORB has been used in two pilot projects. So it is very stable and fast! --- [:masashi | ^umezawa]

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SOAP for multiple images on the same host
by Lyle Bloom 03 Mar '02

03 Mar '02

How is SOAP used for communication between images on the same host? Is this where th port is used? How can I find out the port asscoaited with an image (on Windows and Linux)? Thanks, Lyle __________________________________________________ Do You Yahoo!? Yahoo! Greetings - Send FREE e-cards for every occasion! http://greetings.yahoo.com

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Re: Generalized Object Modules Design
by Anthony Hannan 03 Mar '02

03 Mar '02

Alright, my design has evolved already, here is version 2. Modules are organized in a multiple inheritance hierarchy. Each module provides a name space that contains the names of its local objects plus the local names in all inherited modules. Names are searched in topological sort order, ambiguous names raise an error (This search is only required during compilation). Instead of a module being a repository for objects it is just another object like a class whose main purpose is to provide a name space as described above. Objects will instead be stored in image segments (see below). Methods are compiled with respect to the current working module. Selectors and globals are looked up in the modules name space. Ambiguities are presented to the user allowing him to choose a specific inheritance path to disambiguate. Selectors, like globals, are named objects of modules. Instead of storing selectors in a global symbol table, they are stored in modules. The same selector name in two different modules will be treated as different selectors, compiling will bind the method header and message sends to one or the other. Code can reference a named object that is not inherited by supplying the module path from an inherited module down to the name object. When a name is added or deleted, all methods that use that name are rebound in case they are affected. The current database transaction notes all loads and changes to the image. Upon commit all changes are submitted to the active database. The database will accept the commit if it does not conflict with other concurrent changes. Multiple pending transactions and nested transactions could also be implemented. The main database should contain all "approved" Squeak segments. It can be forked to allow different variants (like 'stable', 'alpha', and 'personal' for each user). Transactions are not forgotten when commited, they are kept around as database layers. A layer can be copied and applied to another database if it does not introduce inconsistencies. And a layer can be broken apart or merged into another layer. A layer would be equivalent to today's changesets. An image segment is the same as today's image segment, it contains all objects reachables from a set of roots that are not reachable from anywhere else. Pointers to objects outside the segment (outPointers) are converted to stubs when its segment or the target segment is unloaded. These stubs reference root objects in other segments by segment id and root number. So records of the Squeak database would be image segments with unique ids and foreign keys that reference other segments. Squeak would organize objects into segments automatically. One scheme is put each module in a different segment, then objects that are reachable from more that one module would be added as a root to the segment whose module is the closest pointer to it. I like this design better from my first one because it separates name space functionality from database functionality. Cheers, Anthony

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Re: How do you print?
by Lex Spoon 02 Mar '02

02 Mar '02

John M McIntosh <johnmci(a)smalltalkconsulting.com> wrote: > > > >I've tried browsing and searching for print, printer, printing on the > >swiki, but no luck so far. > > > >Can someone help me? > > > >Jeff > >wolfb(a)bigfoot.com > > If you look in the list archives (which are where?) You'll find a > PrintJob class and plugin I submitted to allow printing on the > macintosh, that should work elsewhere once someone write the plugins > for the various platforms. Okay, there is now some code on SF so that Unix works with the PrintJobPlugin. You have to manually add this line to the gneerated PrintJobPlugin.c: #include "PrintJobPlugin.h" but I'm sure this will be fixed before too long. Most of the features in the plugin are ignored or stubbed out. -Lex

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Re: SOAP for multiple images on the same host
by Anthony Hannan 02 Mar '02

02 Mar '02

Lyle Bloom <lylebloom(a)yahoo.com> wrote: > How is SOAP used for communication between images on the same host? Is > this where the port is used? Yes. Check out Socket class 'examples' protocol. > How can I find out the port associated with an image (on Windows and Linux)? You use a different port number for every socket you create. A machine can have more than one socket connections. However, a machine only has one ip address. To find the ip address of your machine do "NetNameResolver localHostAddress" you may have to do "Socket initializeNetwork" first.

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Getting rid of metaclasses (Was: Behaviors vs Modules)
by Anthony Hannan 02 Mar '02

02 Mar '02

Nathanael <n.schaerli(a)gmx.net> wrote: > - A mixin may contain a meta-mixin which defines class side behavior. I was leaning towards getting rid of metaclasses. A class reference like "String" would instead reference the String prototype, and class methods would be moved to instance methods under an appropriate category like "instance creation". Class variables can be replaced by instance methods that store arbitrary constants, instead of just literals. This allows overriding without the need to use class instance variables. And the prototype can serve as an example (enhancing documentation) or as a real prototype to copy. The prototype (or any instance) would respond to #new the same as today by creating a brand new instance. It would respond to #copy by copying itself. So the user has a choice.

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