Beginners December 2009

beginners@lists.squeakfoundation.org

29 participants
28 discussions

Is there a tandard way to attach context menus
by Herbert König 04 Nov '11

04 Nov '11

Hello all, is there a standard way to attach a context menu to a morph? It's fairly easy to do by checking for yellowButtonPressed and manually firing up a MenuMorph. But it is sufficient to implement #addCustomMenuItems:hand: to get an enhanced Halo menu while #addYellowButtonMenuItemsTo:event: and #hasYellowButtonMenu don't help. So is there a predefined way without everybody doing his own? Thanks, Herbert mailto:herbertkoenig@gmx.net

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Omnibrowser help
by Rob Rothwell 14 Aug '11

14 Aug '11

Are there some tips/documentation somewhere on getting the most out of the OmniBrowser? The MulitpleSelection browser looks interesting (sort of like the tabbed browser in VisualWorks), but I don't quite understand its behaviour and what method it decides to show in which pane when you move around or save changes. On the same topic, can anyone point me toward how I could add a new item to the class context menu in the OmniBrowser? I want to add a new template selection menu item (like "new class template" and "new trait template") because I have created a method that creates TWO classes at the same time for an Aida application (A domain model class AND its associated WebApp class). Thanks, Rob Rothwell

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Resources with Monticello
by Matthias Korn 15 Apr '10

15 Apr '10

Hi all, how does one work with resources (e.g. image files (GIFs, ...)) used in the application when working with Monticello and in general? Right now I have them on my hard drive and they are read live into Squeak when they are needed. Of course, others don't have the files at hand when working in a distributed fashion. What are the best practices in regard of distribution/packaging as well as performance? Thanks, Matthias -- Matthias Korn Institut für Wirtschaftsinformatik Fachbereich 5 Universität Siegen Telefon: +49 (0) 271 / 23 67 660 Mobil: +49 (0) 176 / 700 17 17 8 Uni: +49 (0) 271/ 740 - 3382 eMail: matthias.korn(a)uni-siegen.de

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Making requests to an HTML server
by DUFOUR, Stephan (ext.) 07 Jan '10

07 Jan '10

Hi, I have several Urls, each giving me a piece of information. I want to write some code that gathers these pieces of information and make a display of the whole situation. The principle is: I send a request to one URL then parse the result and make a new request to another URL using the parsed result. I need some code that somehow mimic a human behaviour: it should 1) go to a URL and get the content (easy part) 2) go to a URL and retrieve some session ID then make a more elaborated request (POST, GET, or even trigger some Javascript) Stephan

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A question about returning values from a block
by Jeff Gonis 30 Dec '09

30 Dec '09

Hi all, If I write the following code to experiment with squeak's block closures I get the expected answer: factorial := [:n | (n=1) ifTrue: [1] ifFalse: [n * (factorial value: (n - 1))]]. factorial 3. -> 6 In this case it appears that the block is implicitly returning the last object, ie: return 1 in the ifTrue: case. If I change the code to explicitly return the 1 ie: factorial := [:n | (n=1) ifTrue: [^1] ifFalse: [n * (factorial value: (n - 1))]]. factorial 3. -> An error indicating that the block cannot return. My question is this: Why is the implicit return of values allowed and not the explicit? Is there a best practice for dealing with block closures in smalltalk, such that we should only be using implicit returns? Thanks for your help, Jeff G.

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Typing single quotes is problem
by Frank Claessen 30 Dec '09

30 Dec '09

Hi All, I just started working with squeak by following Squeack by Example. I installed sqeuak in Kubuntu Jaunty. The problem I have is that when I try typing a single quote ' I get `instead, which of course causes trouble. F.e. Transcript show: `Hello World`;cr is not accepted and causes an error message saying "Argument expected". Anyone recognizes the problem and has a fix for it? TIA Frank

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Check wheater an instance of a class is actually there or not
by Hans Gruber 27 Dec '09

27 Dec '09

> >>>>> "Hans" == Hans Gruber <rukin(a)web.de> writes: > > Hans> Now to my question: > > Hans> How may I check wheater an instance of a class (in my case MyFileLibrary) has been created and exists at the time I check it. > > Hans> (MyFileLibrary = nil) is always false. > > Hans> I need this, because wenn an Instance of MyFileLibrary exists at the > Hans> checking time, I want to proceed with an other method than I want to > Hans> proceed with when an instance of MyFileLibrary does not exists. > > Sounds like you want the singleton pattern. > > The easiest way to do that is to not create instances at all, > and just dump all of your methods class side, and all of your "instance" > variables as "class instance" variables. > > Then treat MyFileLibrary as if it is the only instance that ever exists, > and has a global name. > > If that's not what you want, explain more. > > -- > Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095 > <merlyn(a)stonehenge.com> <URL:http://www.stonehenge.com/merlyn/> > Smalltalk/Perl/Unix consulting, Technical writing, Comedy, etc. etc. > See http://methodsandmessages.vox.com/ for Smalltalk and Seaside discussion > Hi, thanks for the fast answer. Let me explain my problem a bit more detailed. I have 3 Morphs and each of them belong to different classes. What I want to achieve is, that one of the morphs only calls special methods during intialization (in the initialize method) when one of the other morphs has been created before and still exists/is active (so the morph has not been deleted or destroyed). Maybe some pseudo-code to emphasize my problem: Initializtion-Method of the morph which dependent initialization: initialize (Class1 = nil) <---- here should be the Check wheater an Object of Class Xy has been created. ifTrue: [call special methods] ifFalse: [call normal methods] ______________________________________________________ GRATIS für alle WEB.DE-Nutzer: Die maxdome Movie-FLAT! Jetzt freischalten unter http://movieflat.web.de

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syntax to do array as value:value:...
by LordGeoffrey 25 Dec '09

25 Dec '09

Is there a method that does what magicDo does? #(#(1 2 true) #(2 1 false)) magicDo: [:a :b :r | "do something useful" ]

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Anti-aliasing canvas graphics
by Jeff Gonis 23 Dec '09

23 Dec '09

Hopefully this isn't double posted, I sent it in yesterday, but I wasn't a list member and it was pending approval. I figured I should join the list anyway, so without further ado here is my question. ---------- Forwarded message ---------- From: Jeff Gonis <jgon.in.canada(a)gmail.com> Date: Mon, Dec 21, 2009 at 5:20 PM Subject: Anti-aliasing canvas graphics To: beginners(a)lists.squeakfoundation.org Hi everyone, I am executing the following code in the drawOn: method of a morph I am experimenting with as a canvas for some possible turtle graphics experiments: super drawOn: aCanvas. (aCanvas respondsTo: #asBalloonCanvas) ifTrue: [| bc | bc := aCanvas asBalloonCanvas. bc aaLevel: 4. bc line: (self bounds topLeft translateBy: 3 @ 3) to: (self bounds bottomRight translateBy: -4 @ -4) width: 3 color: Color red] This gives me the look I want, except for the fact that the line isn't really anti-aliased. I have attached a screen shot of what the line looks like in the morph. I am wondering how I can go about getting a better looking line with less noticeable aliasing when I draw. Thanks for your help, Jeff G.

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FW: Bitmap-Arrays too large for "contents"
by Hans Gruber 23 Dec '09

23 Dec '09

> Hi Squeak-Fans! > > I am new in programming squeak an I have the following problem: > > I want to integrate bitmap-arrays in my project for the images used in it. To get the elements for my bit-map array I used: > > | image stream | > image := ColorForm fromFileNamed: > '/path/to/picture/icon.gif'. > stream := WriteStream with: String new. > image storeOn: stream. > stream contents. > > By inspecting contents I can copy & paste its elements to the corresponding methods for the image. The Problem now is, that some of my images generate more bitmap-code elements than "contents" can display. Do you have an Idea how may copy&paste all the elements of the Stream!? I tried Seaside WAFileLibrary and pasted the generated methods, but WAFileLibrary returns byte-arrays, which can't be interpretet within the squeak form of *Morph. > > So does anybody of you have an Idea and may help me? > > Thanks, > Regards. > >Your last line could become > > Clipboard clipboardText: stream contents > >However, the canonical way would be to simply generate the method rather than doing it manually. Generating a method can be as simple as > > MyClass compile: 'myMethod ^42' > >See, for example, MenuIcons>>importIconNamed:. > >- Bert - Hi Bert & Squeak Community, thanks for your cool tip. I'll try to generate the methods via "class compile". I've tested it and a new problem came up. I did it the same way MenuIcons>>importIconNamed is implemented. The problem now is, that there comes up a error message ("MessageNotUnterstood(Metaclass)>>category") although I've inserted classfied : 'generated methods' and the category is already created and exists. Here the code snippet: generateMethodsForJPG: aString | writer image stream | writer := JPEGReadWriter on: (FileStream fileNamed: aString, '.jpg'). [ image := writer nextImage] ensure: [writer close]. stream := ReadWriteStream on: (String new). stream nextPutAll: aString ; cr. stream nextPutAll: (self methodStart: aString). image storeOn: stream. stream nextPutAll: self methodEnd. MyGraphicLibrary class compile: stream contents classified: 'generated methods' notifying: nil. ^ stream contents MyGraphicLibrary is a subclass of Object. The error comes up at "compile:[...]". Everything before that works fine. Form is created etc. Simply the compilation does not work. Do you have an Idea what the problem could be here ? Thanks for your help! ______________________________________________________ GRATIS für alle WEB.DE-Nutzer: Die maxdome Movie-FLAT! Jetzt freischalten unter http://movieflat.web.de

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Beginners December 2009