June 2020 - Pharo-users - lists.pharo.org

Re: [Pharo-users] Pharo on Chromebook

by tbrunz

No, it's not quite the same... I've installed CloudReady on old (non-Chromebook) systems myself, so I'm a little bit familiar with it and what it can do. However, I've never tried to run 'Crostini' in CloudReady, so I don't know if that works, or (if it does), how well it parallels the implementation of Crostini on Google Chromebooks. I have read up some on how Google implements a GUI interface to applications running in its Linux containers, and it's not trivial. (But it does work very well on Chromebooks -- you can install a Linux app and have a clickable icon that appears just like any other ChromeOS or Android app icon.) And, yes, Crostini Linux containers give you a way to develop software on Chromebooks! Not only does Pharo work, but also other languages can be installed. (I'm running Pharo, Lua, and Lisp on my Pixelbook model.) For those who are not familiar with CloudReady: The company 'Neverware', with Google's approval (and investment), took ChromeOS's open-source foundation, Chromium OS, and built its own "Chromebook-like" version on top of it called 'CloudReady'. It was designed for schools, to give their old PCs new life -- they can run Google's 'G Suite for Education' while managing CloudReady PCs & laptops with the 'Google Admin Console'. Businesses, other organizations, and individuals can use it too. It's also free for individual users who don't require Google Admin tools. Like ChromeOS, CloudReady is updated every six weeks or so with security fixes and new features. And as with ChromeOS, to use CloudReady you must have a Google account. It not only runs on old WinTel systems, it runs on Mac hardware as well. You can 'test drive' CloudReady on your system without installing it (or wiping out your existing OS) by booting it from a USB thumb drive. If you decide you like it, you can later overwrite your system's OS by installing it to disk. Be aware that it will "take over" your entire drive and restrict the ways you can access it. (Crostini significantly opens up how you can use your disk space, since it basically implements a full Linux file system inside its container.) Here's a recent, detailed article on CloudReady, which includes procedures on how to make a bootable USB thumb drive, test drive it, and install it: https://www.zdnet.com/article/how-to-switch-from-windows-7-to-chrome-os-clo… -t -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

June 9, 2020

Re: [Pharo-users] Willow vs Seaside

by Gabriel Cotelli

Hi Vitor, Willow is built on top of Seaside and it aims to ease the creation of interactive AJAX-based web applications. So if you're planning to do a lot of partial page rendering via AJAX updates it's worth a try. We're using it for several applications and the only full page refresh is done on the first request reception, all the other interactions in the application are handled by AJAX. One of its main features is to abstract away a lot of the complexity of hand made AJAX calls. You can take a look at the slides and videos of the last talk we do in the subject to get an idea of when it's useful: https://www.slideshare.net/FASTPresentations/willow-the-interaction-tour-by… https://youtu.be/U6-JoPRcXHc Feel free to ask any more questions here or on the discord channel. Regards, Gabriel On Mon, Jun 8, 2020 at 12:42 PM Vitor Medina Cruz <vitormcruz(a)gmail.com> wrote: > Hello, > > What's is the difference? Why should I use one or another? > > Regards, > Vitor >

June 8, 2020

PharoJS now runs on Pharo 8 :-)

by N. Bouraqadi

Thanks to Ivo Roefs and Dave Mason ! Noury

June 8, 2020

PharoJS for Pharo 8 is out

by Noury Bouraqadi

Thanks to Ivo Roefs and Dave Mason :-) Noury

June 8, 2020

UK Smalltalk User Group Meeting - Wednesday, June 24th

by Giovanni Corriga

The next meeting of the UK Smalltalk User Group will be on Wednesday, June 24th. Fabio Niephaus (https://fniephaus.com) will talk to us about TruffleSqueak ( https://github.com/hpi-swa/trufflesqueak) a Squeak/Smalltalk VM and Polyglot Programming Environment for the GraalVM (https://www.graalvm.org) He is a Ph.D. student within the Software Architecture Group ( https://hpi.de/swa) at the Hasso Plattner Institute, University of Potsdam, Germany. He has strong interests in dynamic programming languages, virtual execution environments, and software development tools. Fabio will talk about the motivation for his research in the field of Polyglot Programming. With a live demo, he will show how TruffleSqueak can be used as a polyglot IDE for other languages such as Java, Javascript, Python, R, or Ruby. He will also introduce us to the GraalVM ecosystem and discuss his experience in writing a Smalltalk VM in Truffle, GraalVM's language implementation framework. Given the current COVID-19 restrictions, this will be an online meeting. If you'd like to join us, please sign up in advance at the meeting Meetup's page https://www.meetup.com/UKSTUG/events/cbklbrybcjbgc/ to obtain the meeting details. See you there!

June 8, 2020

Willow vs Seaside

by Vitor Medina Cruz

Hello, What's is the difference? Why should I use one or another? Regards, Vitor

June 8, 2020

Re: [Pharo-users] Willow selections

by TomaÅ¾ Turk

Dear Gabriel, thanks for the answer, it helps tremendously. Best wishes, TomaÅ¾

June 8, 2020

Re: [Pharo-users] Few newbie questoins about Pharo/Smalltalk capabilities

by webwarrior

Well, one thing that might disappoint you in Pharo is UI libraries. You'd assume that system that has UI as integral part and relies on it would have excellent UI framework, but sadly that's not the case. Old framework - Morphic - is outdated; it's buggy, poorly documented, and its code is convoluted and hard to reason about. I'd say it has been abandoned (not supported) for the most part. New framework (actually 2 frameworks on top of each other) - Bloc/Brick - is not ready yet. Well, at least actual UI library (Brick). gustav_m wrote > Also, as a hobby I'd like to try some (3.) generative art and (4.) agent > based modeling. Is Pharo suitable for this kind of things? > From what I saw and read it may be good choice for ABM, but some people > cry > about Smalltalk being slow. So maybe I'd be wiser to learn Processing (for > 3) and NetLogo (for 4) instead. This would be unfortunate as these are two > another technologies to learn. Pharo's performance is somewhere between classic interpreters (CPython, Lua, ...) and state-of-the-art JIT compilers (JavaScript V8, LuaJIT, ...). Whether it's slow is a matter of perspective. But 2 important thing should be noted: 1. If you are doing graphics stuff, a large share of CPU time is spent drawing graphic primitives, which is done using native library (e.g. Cairo) and has little to do with language runtime's performance. 2. To optimize performance, profiler is the most important tool. Pharo has built-in profiler that you can use for any code at any time (even profile all stuff that's happening right now). Processing IDE, on the other hand, doesn't even have a profiler. -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

June 8, 2020

Re: [Pharo-users] Willow selections

by Gabriel Cotelli

Hi Tomaz, First check that your selection component is not created in every render cycle, so it can hold its state between calls. Usually components holding state must be kept in instance variables in the containing component, initialized once and rendered many times. Second, the selection state needs to be serialized so it's available in the server. Some affordances (like #determineBehaviorByEvaluating:) applied on the selection component automatically serializes the content but others not. You can check it by looking at the affordances you're using and locating the WebInteractionCommand being applied. Each command responds to #requiresSerialization indicating if it will automatically serialize the content of the triggered component or not. (This deserves a better explanation in the docs, I will create an issue to not forget). In case you're using an affordance not doing automatic serialization or if you want the state to be synchronized when another component is triggered, you need to use some of the serialization affordances (check WebInteractionInterpreter). Depending on the interactivity level you want is the serialization strategy you should use. Now in your case it depends on what you are trying to accomplish. If you want the selection to be available as soon as possible, you need to use serializeIt or serializeWithHiddenInputs if no other affordance is doing the automatic serialization when triggering the selection. If you want to do fewer server calls (and for example just send everything on a single call when a button is clicked) you need to serialize the form containing the selection components when triggering the button. Hope it helps. Gabriel On Mon, Jun 8, 2020 at 4:52 AM TomaÅ¾ Turk <tomaz.turk(a)ef.uni-lj.si> wrote: > Hi, > > when using selection components in Willow (like single and multiple > selection lists), should #currentSelection and #currentSelectionIfNone: be > called only within their own affordances? If I use these messages from > onTrigger evaluate: of other components (e. g. buttons), then I don't get > any selected object back. > > Thanks and best wishes, > Tomaz > > >

June 8, 2020

Youtube REST API?

by StÃ©phane Ducasse

Hello Does any of you already used the youtube REST API? S. -------------------------------------------- StÃ©phane Ducasse http://stephane.ducasse.free.fr / http://www.pharo.org 03 59 35 87 52 Assistant: Aurore Dalle FAX 03 59 57 78 50 TEL 03 59 35 86 16 S. Ducasse - Inria 40, avenue Halley, Parc Scientifique de la Haute Borne, BÃ¢t.A, Park Plaza Villeneuve d'Ascq 59650 France

June 8, 2020