January 2015 - Pharo-users - lists.pharo.org

Re: [Pharo-users] Supporting Start up around Pharo

by stepharo

This includes one year salary. But it requires building a case and being motivated :) Le 28/1/15 11:51, stepharo a Ã©crit : > Hi guys > > if you are considering to create a start up around Pharo, we could > find one year financial support > if this is serious and that you would like to come to work around > Lille or France. > > Stef > >

Jan. 28, 2015

New book for Pharo :)

by stepharo

Didier Besset offered his great book "Object-Oriented Implementation of Numerical Methods An Introduction with Smalltalk and Java" to the community. We would like to thank Didier Besset for his great book and for his gift of the source and implementation to the community. You can find â¢ Archive of the original book, with code in both Java and Smalltalk https://github.com/SquareBracketAssociates/ArchiveOONumericalMethods https://github.com/SquareBracketAssociates/ArchiveOONumericalMethods/blob/m… â¢ An abridged version of Didierâs book, without the Java implementation and reference; our goal is to make the book slimmer and easier to read. The implementation presented in this book is part of the SciSmalltalk library. https://github.com/SquareBracketAssociates/NumericalMethods https://github.com/SquareBracketAssociates/NumericalMethods/blob/master/201… â¢ SciSmalltalk library https://github.com/SergeStinckwich/SciSmalltalk. Both book versions are maintained by St Ìephane Ducasse and Serge Stinckwich. 27 Janvier 2015

Jan. 28, 2015

Re: [Pharo-users] Waiting object

by Ben Coman

On Wed, Jan 28, 2015 at 11:31 PM, Laura Risani <laura.risani(a)gmail.com> wrote: > Hi Ben , > #fork let me implement the overall functionality i wanted, but i had to > introduce some minor changes into the design to reflect the concurrent > nature of the msg. So i still feel curious about how one could implement > this msg > > Waiting>> wait : seconds > "i take the flow control during 'seconds' without halting image morphs and > only then return to the sender " > There is only one Morphic UI loop process which repetitively cycles for Morph stepping and the main interactive UI. Use "Tools > Process Browser" to take a look at that process (priority=40) and its stack and you'll WorldMorph>>doOnceCycle. If you are curious, you can put a "self haltOnce" in that method and invoke it using "System > Enable halt/inspect once" and it will spawn that fault in that cycle off to another process you can trace through, while the main process continues to cycle. However if you perform a non-concurrent #wait or busy calculation, then the UI loop is prevented from looping at its usual speed (see #interCyclePause). cheers -ben > > Best, > Laura > > On Tue, Jan 27, 2015 at 7:00 PM, Ben Coman <btc(a)openinworld.com> wrote: > >> Hi Laura, Can you provide some more context by pasting code for how you >> expect both your UI and calculation methods to interact? What is the >> application? >> >> cheers -ben >> >> On Wed, Jan 28, 2015 at 5:49 AM, Laura Risani <laura.risani(a)gmail.com> >> wrote: >> >>> Hi all, >>> Thank you for your answers. >>> >>> But i yet can't see how to implement the method i wanted, because #fork >>> schedules the process and immediately returns but i'd like to wait and only >>> then return the answer. >>> >>> >>> Best, >>> Laura >>> >>> On Tue, Jan 27, 2015 at 3:46 PM, Laura Risani <laura.risani(a)gmail.com> >>> wrote: >>> >>>> Hi all, >>>> >>>> I need an object/method like this one >>>> >>>> Waiting>> wait : seconds >>>> "i take the flow control during 'seconds' without halting image morphs >>>> stepping/handling (as Delay>>wait: does) and then return to the sender " >>>> >>>> How can i implement it? >>>> Where can i borrow for reuse an existing one from? >>>> >>>> >>>> Best, >>>> Laura >>>> >>> >>> >> >

Jan. 28, 2015

PostGIS in Pharo

by Esteban A. Maringolo

Is there anybody using PostGIS in Pharo? Regards! Esteban A. Maringolo

Jan. 28, 2015

Re: [Pharo-users] dirty packages

by Esteban Lorenzano

You can try rebuilding the rpackage structure. 1) close all browsers 2) execute RPackageOrganizer default initializeFromMC Esteban > On 28 Jan 2015, at 16:50, Usman Bhatti <usman.bhatti(a)gmail.com> wrote: > > Hello, > > I have two packages MyPackage and MyPackage-Ext. When I load MyPackge-Ext, MyPackage becomes dirty and do not have any clue why. When I try to see changes in MyPackage in Monticello Browser, the package becomes clean again. > > There are two possibilities why MyPackage-Ext makes MyPackage dirty: > -> There are names conflict of some sort (MyPackage-Ext can be seen as a category for MyPackage). > -> Overriding of the extension methods introduced on the third package. Now I wrote a small script to verify it: > firstCollection := (RPackage organizer packageNamed: 'MyPackage') extensionMethods values flatten. > secondCollection := (RPackage organizer packageNamed: 'MyPackage-Ext') extensionMethods values flatten. > (secondCollection intersection: firstCollection) > The above script gives empty result so there are no overriding selectors. > > Any ideas how can I hack into Monticello to see what is causing MyPackage to become dirty while I load the second one manually. May be by logging the override load definitions on Transcript? > > In general, will it be possible to see overriding without these disappearing when doing changes on a dirty package? > > > tx in advance. > > Usman > >

Jan. 28, 2015

Re: [Pharo-users] Why single inheritance?

by ClÃ©ment Bera

2015-01-28 16:41 GMT+01:00 Laura Risani <laura.risani(a)gmail.com>: > Hi all, > > What is the explanation why Smalltalk designers preferred single > inheritance+traits to multiple inheritance? Why is the former better than > the latter? > Do traits let you share state also or only behavior? > Traits only share behaviors. As you guessed, it is still questionable to many people if multiple inheritance is good because state can be inherited multiple times. For example, what do happen if C inherits from A and B and that both A and B have a field name i. There are existing solutions for this problem but they're all not perfect. Traits were implemented language-side only. If you want you can implement multiple inheritance language side only too (as for traits, you'll have to add virtual copies of methods and if state is shared too you'll have virtual copies of instance variables to run on our current VM), and see which one you prefer. I'd be glad to hear your feedback on that. > Best, > Laura >

Jan. 28, 2015

dirty packages

by Usman Bhatti

Hello, I have two packages MyPackage and MyPackage-Ext. When I load MyPackge-Ext, MyPackage becomes dirty and do not have any clue why. When I try to see changes in MyPackage in Monticello Browser, the package becomes clean again. There are two possibilities why MyPackage-Ext makes MyPackage dirty: -> There are names conflict of some sort (MyPackage-Ext can be seen as a category for MyPackage). -> Overriding of the extension methods introduced on the third package. Now I wrote a small script to verify it: firstCollection := (RPackage organizer packageNamed: 'MyPackage') extensionMethods values flatten. secondCollection := (RPackage organizer packageNamed: 'MyPackage-Ext') extensionMethods values flatten. (secondCollection intersection: firstCollection) The above script gives empty result so there are no overriding selectors. Any ideas how can I hack into Monticello to see what is causing MyPackage to become dirty while I load the second one manually. May be by logging the override load definitions on Transcript? In general, will it be possible to see overriding without these disappearing when doing changes on a dirty package? tx in advance. Usman

Jan. 28, 2015

Why single inheritance?

by Laura Risani

Hi all, What is the explanation why Smalltalk designers preferred single inheritance+traits to multiple inheritance? Why is the former better than the latter? Do traits let you share state also or only behavior? Best, Laura

Jan. 28, 2015

Re: [Pharo-users] SPEC and Athens

by Sebastian Heidbrink

Welcome to the world of Smalltalk! Am 28.01.2015 um 07:27 schrieb Mark Rizun: > I have the same problem with PolygonMorph. It does not resize properly. > Also I couldn't find any event related with window resizing. > If you find a solution please let me know. > > Mark > > 2015-01-28 16:19 GMT+01:00 Sebastian Heidbrink <sheidev(a)yahoo.de > <mailto:sheidev@yahoo.de>>: > > Am 28.01.2015 um 07:07 schrieb Mark Rizun: >> >> First the svg does not resive properly while resizing the window. >> >> >> What do you mean by this? > > Well, I implemented the example window from spec.st > <http://spec.st> and added a ASVGMorph to it. > When I now resize the window, then the button changes his size > correctly but the svg somhow just seems to be put into the background. > I then implemented a SVGMorpModel that includes a ASVGMorpAdapter > and adde dthis one to my example window but the result is that the > SVG resizes just half the speed... > > >> How can I also introduce an animated SVG? Like an svg that >> changes color during a mouse click? >> >> >> To work with events that are implemented in AthensSvgMorph you >> have to (as far as I know) access this morph. >> You can do it by sending #widget message to your model to times >> like this: >> >> svgModel widget widget ==> svgMorph >> >> Than morph can handle events like "changes color during a mouse >> click". >> >> Are there any particular Models that could be used as a >> container for this SVGMorphAdapter? >> >> >> SVGMorphAdapter is a class that represents a layer betwen >> SVGMorph and model of svg in spec. >> It allows model and morph to "communicate" with each other. >> >> Mark > >

Jan. 28, 2015

Re: [Pharo-users] Waiting object

by Laura Risani

Hi Ben , #fork let me implement the overall functionality i wanted, but i had to introduce some minor changes into the design to reflect the concurrent nature of the msg. So i still feel curious about how one could implement this msg Waiting>> wait : seconds "i take the flow control during 'seconds' without halting image morphs and only then return to the sender " Best, Laura On Tue, Jan 27, 2015 at 7:00 PM, Ben Coman <btc(a)openinworld.com> wrote: > Hi Laura, Can you provide some more context by pasting code for how you > expect both your UI and calculation methods to interact? What is the > application? > > cheers -ben > > On Wed, Jan 28, 2015 at 5:49 AM, Laura Risani <laura.risani(a)gmail.com> > wrote: > >> Hi all, >> Thank you for your answers. >> >> But i yet can't see how to implement the method i wanted, because #fork >> schedules the process and immediately returns but i'd like to wait and only >> then return the answer. >> >> >> Best, >> Laura >> >> On Tue, Jan 27, 2015 at 3:46 PM, Laura Risani <laura.risani(a)gmail.com> >> wrote: >> >>> Hi all, >>> >>> I need an object/method like this one >>> >>> Waiting>> wait : seconds >>> "i take the flow control during 'seconds' without halting image morphs >>> stepping/handling (as Delay>>wait: does) and then return to the sender " >>> >>> How can i implement it? >>> Where can i borrow for reuse an existing one from? >>> >>> >>> Best, >>> Laura >>> >> >> >

Jan. 28, 2015