Squeak-dev May 2007

squeak-dev@lists.squeakfoundation.org

150 participants
233 discussions

Any reason for assigning block parameter in inject:into:
by Stéphane Ducasse 02 May '07

02 May '07

Hi I would like to know if there are any reason (except in imageSegment) to assign to inject:into: parameter. we saw String asPacket asPacked ^ self inject: 0 into: [:t1 :t2 | t1 := t1 * 256 + t2 asInteger] The assignment is not needed since the semantics of into: is to do that exactly

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The Integer hex and what to do
by Edgar J. De Cleene 02 May '07

02 May '07

I don't wish start another flames war, but: johnpf in http://bugs.squeak.org/view.php?id=6441 Reports (again) about SmallInteger hex not understood About a year, I complain about this In mantis exist a elaborate solution by Boris Gaertner http://bugs.squeak.org/view.php?id=987 The last note claim what was incorporated to 3.9. But today I see what not all is in 3.10. The solution what johnpf put in Mantis is Integer>>hex ^self printStringBase: 16 What is what once WAS in image. I plan to take this for end the subject, wish any what have some against this solution said now. Edgar

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Another stupid Morphic Question
by Andrew P. Black 02 May '07

02 May '07

In my continuing quest to make sense of Morphic, I've run up against the following situation. I have a RectangleMorph (subclass). Embedded in it are a number of CircleMorph (again, actually a subclass) connected by NCAAConnectorMorphs. I want to be able to move the circles by dragging them with the red button. This is exactly the default behavior when they are in the World — but when they are in the RectagleMorph, a mouse click picks up the whole rectangle. I have tried making handleMouseDown: answer false in the RectangleMorph, and to answer true in the circles — this doesn't help. Conversely, I _don't_ want to be able to pick up the Rectangle with a single red click. But I can, and I can't turn this off, even though handlesMouseDown: and handlesMouseStillDown: answer false. This should be trivial, shouldn't it? Andrew ________________________________________________ The Morphic tarpit: where everything is possible ... but nothing is easy

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Preemptive scheduling
by J J 02 May '07

02 May '07

Hi all, Does the Squeak VM do preemptive scheduling or regular yield style scheduling. This may sound like a silly question, but I know Erlang is language that does mainly green threads and they are preemptive in nature. They accomplish this by allowing a given thread to execute no more then 100 VM instructions before it is preempted (obviously if a thread makes a primitive call that is a voluntary yield). Does Squeak do this already? I suspect not, and if I am correct, would there be any benefit in doing something like this or would it actually slow things down? Thanks, Jason _________________________________________________________________ Dont quit your job Take Classes Online and Earn your Degree in 1 year. Start Today! http://www.classesusa.com/clickcount.cfm?id=866146&goto=http%3A%2F%2Fwww.cl…

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Is it time to initiate the next release project?
by Jerome Peace 02 May '07

02 May '07

HI Keith, Thanks for your reply. The first question was largely [OT] to the point of this thread. The important question is the title of the thread. It would be good to see a discussion of that other question too and in a separate thread. What I want is to focus the boards attention on the future. (As I am sure does Stef). Yours in curiosity and service, _Jerome Peace *** > Is it time to initiate the next release project? > Keith Hodges keith_hodges at yahoo.co.uk > Wed May 2 01:06:00 UTC 2007 > > > 1) Would this addition be appropriate within the > > current scope of 3dot10's mission? > > > In terms of 3.10's mission, this addition, if it is > possible to package > this up as an additional load in a package to 3.10, > then it falls > outside of 3.10's mission, and into 3.10's package > universe. > > best regards > > Keith *** __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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reminder: Squackers meeting 2007-05-02
by Craig Latta 02 May '07

02 May '07

Hi-- Just a reminder that the next San Francisco Bay Area Squeak Hackers ("Squackers") meeting is happening tomorrow, 2 May, from 8pm to 10pm pacific time at my place, with a potluck dinner at 7pm. RSVP to me for directions. We usually meet the first Wednesday of each month. We'll screen the "Squeakers" movie, and I'll show off recent work with object memory visualization[1], the Spoon release[2], and the Spoon book[3]. If you have something you'd like to show on the big screen, please let me know! The meeting will also be accessible live online through Skype; call me there at "threnkeldwingnut". see you then! -C [1] http://netjam.org/spoon/viz [2] http://netjam.org/spoon/releases/current [3] http://netjam.org/spoon/the%20Spoon%20book.pdf -- Craig Latta improvisational musical informaticist www.netjam.org Smalltalkers do: [:it | All with: Class, (And love: it)]

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Another stupid Morphic Question
by Jerome Peace 02 May '07

02 May '07

Hi Andrew, Just wanted to point you to my previous reply http://lists.squeakfoundation.org/pipermail/squeak-dev/2007-May/116371.html And I found some of my wip code that my serve as a good example and placed it on bob's superswiki here: http://209.143.91.36/super/728 aka http://209.143.91.36/super/MovingPiece-wiz Its in the form of a project meant to work in 3.9 (7067). HTH. Yours in curiosity and service, --Jerome Peace *** > > > Another stupid Morphic Question > Andrew P. Black black at cs.pdx.edu > Tue May 1 16:03:44 UTC 2007 wrote: > > On 1 May 2007, at 1:07, Andreas Raab wrote: > > > ... it's the world which implements the default > behavior of > > dragging objects. In other words the action is > contextual (objects > > in the world can be dragged) not builtin. > > Aha! This was an insight that I was missing. Someone > should write a > book that explains all this stuff ;-) > Why not start a wiki page. You can either copy from the mail or use hypertext to point to the relevant emails in the archive. > > This code seems both overly complicated as well as at > least > > somewhat buggy (grabMorph:from: should only be used > for owner-less > > morphs). Try the following instead: > > > > rect := RectangleMorph new. > > rect extent: 100 at 100. > > circle := EllipseMorph new. > > circle extent: 100 at 100. > > rect addMorphCentered: circle. > > rect on: #mouseDown send: #value to:["ignore drags"]. > > circle on: #mouseDown send: #value > > to:[circle world primaryHand grabMorph: > circle]. > > rect openInWorld. > > Well, this is much more elegant: the use of on:send:to: > simplifies > things considerably, and, along the way, explains how > to use > EventHandlers, which were another mystery. But it has > the same bug: > once the circle has been "picked up", it is no longer a > submorph of > the rectangle. Presumably that could be fixed by a > #mouseUp handler, > although I tried adding > > circle on: #mouseUp send: #value > to:[rect addMorph: circle]. > > which appeared to have no effect. > > > >> I could probably find all of the bits of code that I > need, to > >> handle mouse move and so on, taking care of the > offset between > >> mouse click event and the origin of the Morph that > I'm moving > >> most of the code must be in HaloMorph. But this was > the Default > >> Behavior of the circle before I embedded it in the > rectangle > >> surely there must be an easier way to get that > default behavior > >> back, other than duplicating the code from whereever > it is hidden! > > > > Well, by far the easiest way is to use a PasteUpMorph > instead of a > > RectangleMorph - PasteUps have this behavior builtin. > > That is the answer I was looking for! Inter alia, it > explains what a > PasteUpMorph is for, somthing that I had never > appreciated (except to > know that the World was one). > > Thank you! > > Andrew P. Black > Department of Computer Science > Portland State University > +1 503 725 2411 > > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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The Weekly Juan #10: "Cheap, High Quality Fonts in Squeak"
by Juan Vuletich 01 May '07

01 May '07

Hi Folks, The Weekly Juan #10 is out at http://www.jvuletich.org/issues/Issue0010.htm . I managed to get antialiased subpixel rendered fonts in Squeak without modifying any plugin, just with a 13kb change set. Hope you like it. Any comment is welcome. Cheers, Juan Vuletich

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ESUG SummerTalk 2007 Strongtalk project
by David Griswold 01 May '07

01 May '07

Hi everyone. ESUG has graciously offered to fund a student to help with the Strongtalk project as part of the SummerTalk 2007 program (thanks Stephane). SummerTalk will pay the student 1500 euros for this work. I will be acting as mentor for this project. While there are various possibilities for this project, I will be starting to work on porting Squeak to the Strongtalk VM, and ideally I would like to find someone who wants to work with me on that. This will entail diving deeply into the Squeak and Strongtalk VM interfaces, and figuring out how to adapt the Squeak image so that it will boot off the Strongtalk VM. This ought to be a very interesting tour through the guts of two very interesting systems. If the port turns out to be too large a job, there are subtasks that can be fairly easily defined, such as setting up the Strongtalk system for re-bootstrapping, which is a necessary step. Of course, there are other possibilities if that doesn't sound interesting or if your talents lie in other areas. For example, there is work in progress on porting the Strongtalk VM to Linux and MacOS that is a high priority for the Strongtalk project. Please contact me if you are registered or if you know someone who might be interested, at David.takeThisPartOut.Griswold.at.acm.org - Dave

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moveThisWay (ans to Another stupid Morphic Question)
by Jerome Peace 01 May '07

01 May '07

Hi Andrew, This is one I bumped heads with a while back. I tried things along the line you suggested and tied myself in knots. So I started with what I knew worked. Handles on polygons and looked at what they used. The #on:send: message is the best way I have found to add behavior to morphs. define a method in your inheritance chain (e.g.) Morph>>initializeMyMove self on: #mouseMove send: #moveThisWay to: self ; on: #mouseUp send: #stopThat to: self . Then make methods #moveThisWay and #stopThat in your specific subclass to do what you want. Then make a sample of your morph and send it the initializeMyMove message. where circle understands what you mean by #moveThisWay and #stopThat. I found by experimenting that circle would not listen to mouse move unless it was also listening to #mouseUp or #mouseDown. I also found I absolutely didn't need to write my own low level stuff for the morphs. ----- To stop the rectangle from moving you need to make it "resist being picked up" from the red halo or tell it to #beSticky programatically. I also agree that if you can get away with using a pasteup morph instead of the rectange thats a win. A tip of the hat to Andreas who said it first. ----- There are also tricks for making the gui feel smoother. For my application I update my morphs position from the delta of the mouse move desiredPosition := oldPosition + mouseMoveEnd - mouseMoveStart + tug. Where tug was a vector based on the signs of the coordinates of (mousePosition - oldPosition). finally you apply constraints to desiredPosition (e.g. constrain to be within the owners bounds and what results is the newPosition to which you move your morph. On mouse up I wanted to insure my morph wound up on a grid intersection. So the final behavior was essentially snap to grid. Again for ideas look at the behavior of handles. HTH, Yours in service, --Jerome Peace __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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