February 2015 - Pharo-users

Re: [Pharo-users] pharo and ui again
by Stephan Eggermont Feb. 12, 2015

Feb. 12, 2015

Sebastian wrote: >After 5 days I can tell ,that I am lost in Morphic, UIManager, Traits/No-Traits, Spec, GLMMorphic, Poly.... >And sometimes things are even mixed up and I am not able to decide which approach to follow,... If your goal is a "Maya Editor"-like UI, I've put together something that could be useful as a starting point. I would be interested in how to encapsulate this in Spec, and in what should change in Bloc. The idea is to grow it into a tutorial. http://smalltalkhub.com/#!/~StephanEggermont/MorphicDraw Stephan

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pharo and ui again
by Sebastian Heidbrink Feb. 12, 2015

Feb. 12, 2015

Hi again! Well, we had an other Software Smalltalk Night and we want to try to make a Smalltalk Kinect Fun project. It was pretty easy to conenct the Kinect camera with a Squeak For Scratch image. That enabled everybody to easily get going. Since a few days I try to prepare further steps and I must say,... I am completely lost in the UI frameworks. Let's have a simple example. A window with a title, 2 labels, 2 entry fields, one checkbox and 2 buttons. e.g. a login form for a Pharo application. We will need the parts, the layout, the events, the starting point as well as a result handler.... After 5 days I can tell ,that I am lost in Morphic, UIManager, Traits/No-Traits, Spec, GLMMorphic, Poly.... And sometimes things are even mixed up and I am not able to decide which approach to follow,... Some examples store widgets in instance variables, others initialize the morph based on the underlying model. MVC is sometimes mixed up... And this was just the topic parts and partially layout and events.... How does one open this login as an overlay, or as temporary replacement for the main content.... Â I tried Spec, but somehow it is much more difficult to get a proper functioning layout that behaves mature during resize and such events than expected. Is it possible to take a more Squeakish approach and just instantiate ui components compose them, define handler/callback symbols in those instances and then generate a specification/code out of this? Can anybody please point me at a full documentation on how to do things properly? There are many examples for the widgets but there is not a single example on how to built a real framework based on MVC in Pharo. Well and unfortunately a lot of stuff is outÃdated already. I somehow have the feeling that one and the same thing was implemented over and over again. I honestly try to bring Pharo/Smalltalk to the crowd, but somhow I feel like the UI development removes all the productivity that one usually has with Smalltalk. I'd like to provide the interested locals here with a bsic implementation that they will be able to extend or go on with. But I do not want to invest time into not supported things. Thank you for any hint again! Sebastian

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Re: [Pharo-users] pharo and ui again
by Pablo R. Digonzelli Feb. 12, 2015

Feb. 12, 2015

where can i watch it? Pablo ----- Mensaje original ----- De: "Sven Van Caekenberghe" <sven(a)stfx.eu> Para: nicolaihess(a)web.de, "Any question about pharo is welcome" <pharo-users(a)lists.pharo.org> Enviados: Jueves, 12 de Febrero 2015 3:29:42 Asunto: Re: [Pharo-users] pharo and ui again > On 12 Feb 2015, at 00:46, Nicolai Hess <nicolaihess(a)web.de> wrote: > > But much howtos or tutorials widely scattered and aren't up to date. Johan Fabry's talk at the Pharo Days was an excellent introduction to Spec, watch it.

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a successful success story
by Alain Busser Feb. 12, 2015

Feb. 12, 2015

It is in French so I try to translate some parts. My goal was to teach as fast as possible the binomial distribution (number of successes when independently repeating a Bernoulli experiment) to students who, either have never seen an algorithm, or have seen some algorithmics in math lessons and don't like it at all. Both categories loved what I did with them. I precise that almost all of them are allergic to english language. The assignment was "throwing 10 dices, what is the probability of having at least 2 times "6" around the 10 results?" The whole job is related here: http://irem.univ-reunion.fr/IMG/pdf/binomiale.pdf (but I did only pages 1-5 in one hour) The first step was to show how one can simulate the throwing of 10 dices. I can do it without having to make a variable vary (explicitely at least), thanks to Seymour Papert: 10 timesRepeat: [ Transcript show: (6 atRandom)]. Then I spoke about the usefulness of the Bag object when there are statistics: Adding the 10 results (small integers) inside a Bag makes it an object where one can see and count the 6es: | urn | urn := #( ) asBag. 10 timesRepeat: [ urn add: (6 atRandom)]. Transcript show: urn. (Why "urn"? This is the word used by Bernoulli, he was thinking about balls concealed inside a vase for which the latin word was "urna"; the balls where called "billets" by Condorcet, so that they could instead be pieces of paper; whatever they were, a vase was use to conceal them) Then there remains only one difficulty: How can I automatize the counting of the 6es inside the bag? There is the most frightening challenge: Use a block with students who have never seen Pharo before. Very good surprise: They didn't seem to find this that difficult, I just had to say that 1. The pipe symbol means "such that" like in my lessons 2. The first time I use the letter "x" I have to tell Pharo that it is yet no variable to evaluate, hence the need to precede it with a colon. With that in mind, counting the 6es is the same as counting the x-es such x equals 6: | urn | urn := #( ) asBag. 10 timesRepeat: [ urn add: (6 atRandom)]. Transcript show: (urn count: [ :x | x=6]). Afterwards it remained only to repeat the whole experiment and, instead of showing the number of 6es, adding it to another bag called "stats", then displaying this bag. The end was made with a tool which exists only in mathsOntologie: The displaying of a bar chart in a translucent Morph, so that the most rapid of the students could compare several bar charts by superposition and guess the shape of the distribution. Once again, they all loved it, either because they found Pharo a better tool than whatever they knew before (and disliked), or because they knew nothing similar before (one exception: A girl who never learned algorithmics but just happens to love playing with a computer, here she is: http://reunion.la1ere.fr/2014/06/04/miss-reunion-muriel-roger-candidate-nde… ). I insist on the fact that they never saw anything like Smalltalk before, and did not seem to "rtfm": Is it because Smalltalk is a natural language or because MathsOntologie mimics the french language, I lack elements of comparison to answer to this. But I insist also to say that these students seem to dislike probability theory too. Finally, some stats about these stats: I can rapidly find the bugs when the text appears in red, and most of the time a point was missing at the end of a line, or a right bracket was missing or misplaced. Sometimes they add a space inside a word like asBag which becomes "as Bag". Alain Busser IREM La RÃ©union

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Re: [Pharo-users] pharo and ui again
by Stephan Eggermont Feb. 12, 2015

Feb. 12, 2015

Thanx Nacho, fixed in .4 Stephan

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Getting notified when a morph moves
by Stephan Eggermont Feb. 12, 2015

Feb. 12, 2015

I'm trying to keep a line morph connected between two morphs while moving one of them. When I add the morph to the hand and start dragging the morph no longer receives mouseMove:. I can think of several ways to get position updates. Is there a best/easy way? Stephan

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[Job][Research] Inria Competitive selection 2015 : young graduate scientist ("CR2")
by Marcus Denker Feb. 12, 2015

Feb. 12, 2015

Competitive selection 2015 : young graduate scientist ("CR2") Inria is launching a round of competitions to recruit seventeen young graduate scientists. Theses positions will be allocated as follows: two positions at Grenoble, Lille, Nancy, Rennes, Rocquencourt, Saclay and Sophia-Antipolis research centres and three positions at Bordeaux research centre. Registration conditions ================== Registration for the young graduate scientist competition begins on 26 January 2015. The following may apply: â¢ Holders of a doctorate or equivalent degree; â¢ Applicants able to prove publications and scientific work deemed equivalent. There are no age limits or nationality requirements for the recruitment of young graduated scientists. DEADLINE: ========= â¢ 20 February 2015: Deadline for downloading application files â¢ 23 February 2015: Deadline for submitting application files More information: http://www.inria.fr/en/institute/recruitment/offers/young-graduate-scientis…

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Re: [Pharo-users] Getting notified when a morph moves
by Stephan Eggermont Feb. 12, 2015

Feb. 12, 2015

Thanks Hilaire, that works fine. I can add the listener when the actual dragging starts and remove it on mouseUp. MDShape>>doDrag: aMouseMoveEvent with: aMDShape ActiveHand addEventListener: self. aMouseMoveEvent hand startDrag: aMouseMoveEvent with: aMDShape. MDShape>>handleListenEvent: anEvent anEvent isMouse ifFalse: [ ^self]. anEvent isMouseUp ifTrue: [ ActiveHand removeEventListener: self ]. anEvent isMouseMove ifTrue: [ self moved ] MDShape>>moved connectors do: [ :connector | connector moved ] Stephan

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Re: [Pharo-users] GSOC 2015 application
by Stephan Eggermont Feb. 12, 2015

Feb. 12, 2015

Sebastian wrote: >Can I brainstorm a wishlist? I could get wild on it :D Sure, as long as it is projects that you would be willing to mentor, and sized like they could fit. Stephan

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Re: [Pharo-users] recover lost changes
by Hartmut Feb. 12, 2015

Feb. 12, 2015

Thanks to all of you ! > Le 11/2/15 18:58, Sean P. DeNigris a ?crit : >> Sean P. DeNigris wrote >>> I can not reproduce this... >> Okay, I see. It only happens when Nautilus (the browser) is on the >> class-side. Looking deeper, there is in general a flaw in Nautilus - at >> least in announcement handling - because it doesn't take class vs. metaclass >> into account. I started fixing it, but don't have time now. >> >> The basics for anyone that's interested: selected class could be a class, >> metaclass, or nil, so there needs to be a nil guard first, then something >> like selectedClass theNonMetaClass = aClass. Browsing (scoped to Nautilus) >> senders of #selectedClass is a good start. HTH 1. the <DoIt: ChangesLog reset; default> repairs the ChangesLog and 2. I can identify (and eventually remove) the empty class comments written by the meta class Hartmut -- Hartmut Krasemannâ¨ KÃ¶nigsberger Str. 41 c â¨D 22869 Schenefeldâ¨ Tel. 040.8307097â¨ Mobil 0171.6451283â¨ krasemann(a)acm.org

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