Beginners March 2010

beginners@lists.squeakfoundation.org

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29 discussions

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Re: i++
by Chris Cunnington 16 Mar '10

16 Mar '10

Thanks, that's got it. I couldn't see it for some reason. Cheers, Chris

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help regarding keyboard event
by priti verma 16 Mar '10

16 Mar '10

hi, I want to know how to invoke key press event in squeak speacly tab key pressed??if any one have any study material or any thing please help Thanks Priti

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Ho to get center of the system screen
by FrankBz 15 Mar '10

15 Mar '10

Hi, how can I get a point representing the screen center? I need it to open a morph at that position. So far I tried with - World center - but the position is on the bottom right of the screen. Does anyone know how to get it? Thanks in advance -- View this message in context: http://n4.nabble.com/Ho-to-get-center-of-the-system-screen-tp1592329p159232… Sent from the Squeak - Beginners mailing list archive at Nabble.com.

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Re: Permutations and Combinations
by Paul DeBruicker 12 Mar '10

12 Mar '10

Ahh. Thanks. Thats helpful. An illustration of what I want is: |w x y z | w:=OrderedCollection with: 'A' x:=OrderedCollection with: 'a' with: 'b' with: 'c' with: 'd'. y:=OrderedCollection with: '1' with: '2' with:'3'. z:=OrderedCollection with: x with: y. from z I want to get #('A' 'a' '1') #('A' 'a' '1') #('A' 'a' '1') #('A' 'a' '1') #('A' 'a' '1') #('A' 'a' '1') #('A' 'a' '1') #('A' 'a' '1') #('A' 'a' '1') #('A' 'a' '1') #('A' 'a' '1') #('A' 'a' '1') #('A' 'a' '1')

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Permutations and Combinations
by Paul DeBruicker 12 Mar '10

12 Mar '10

Hi -- Is there a standard Smalltalk way to enumerate the possible permutations and combinations of a collection of collections? I'm not having any luck googling for an example or mention of a class or package to use. I'm trying to minimize a non linear cost function and want to calculate the set of costs. The collection of collections can have any number greater than two collections in it and those collections are of varying size. Thanks Paul

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LedMorph - step problem
by FrankBz 08 Mar '10

08 Mar '10

Hi, I'm trying to write a LedMorph that shows the actual time. It should have also two buttons, 'quit' which closes the frame and 'stop' which should stop the clock. Unfortunately the stop button does not work and I can't figure out where's the problem. Even by trying to send the stopStepping message manually from a workspace the LedMorph doesn't stop stepping. Does anyone know what's the problem? I post the code, please tell me what I'm doing wrong. -> OriginalLed class has messages: initialize, step (they overwrite ancestor messages to set desired behavior) LedMorph subclass: #OriginalLed instanceVariableNames: 'time' classVariableNames: '' poolDictionaries: '' category: 'MyLed' initialize super initialize . time := Time new . self chars: 8 . self flash: true . self extent: (100@100) . self position: (200@150) . step time := Time now . self string: time print24 . -> LedFrame is a subclass of AlignmentMorph, which contains the OriginalLed and buttons. It defines 4 messages: -> initialize, addControls, addLed, stopStepping AlignmentMorph subclass: #LedFrame instanceVariableNames: 'controls led' classVariableNames: '' poolDictionaries: '' category: 'MyLed' initialize super initialize . self listDirection: #bottomToTop . self position: (200 @ 150) . self addControls . self addLed . self openInWorld . addControls controls := AlignmentMorph new listDirection: #rightToLeft . controls addMorph: (SimpleButtonMorph new target: led; label: 'stop'; actionSelector: #stopStepping) . controls addMorph: (SimpleButtonMorph new target: self; label: 'quit'; actionSelector: #delete) . self addMorph: controls . addLed led := OriginalLed new . self addMorph: led . stopStepping led stopStepping . I didn't write any comment inside the code, since it's very simple to understand. Sorry if I misspelled any term or said anything wrong, I'm a real squeak beginner. -- View this message in context: http://n4.nabble.com/LedMorph-step-problem-tp1582908p1582908.html Sent from the Squeak - Beginners mailing list archive at Nabble.com.

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sorting elements in OrderedCollection
by sergio_101 07 Mar '10

07 Mar '10

if i have an OrderedCollection, how would i go about spitting them out sorted on one of the variables? ie. if i have people, which is a list of person(s), how would i spit out a list sorted by last name? thanks! -- ---- peace, sergio photographer, journalist, visionary http://www.coffee-black.com http://www.painlessfrugality.com http://www.twitter.com/sergio_101 http://www.facebook.com/sergio101

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pretty print
by sergio_101 06 Mar '10

06 Mar '10

i am using the pharo based seaside one click 3.0a image, and notably missing is 'pretty print' did i just misplace it? thanks! -- ---- peace, sergio photographer, journalist, visionary http://www.coffee-black.com http://www.painlessfrugality.com http://www.twitter.com/sergio_101 http://www.facebook.com/sergio101

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editing an instance variable in an OrderedCollection
by sergio_101 06 Mar '10

06 Mar '10

if i have an ordered collection of say albums... and the albums have a 'desc' instance variable.. and i decide i want to change 'desc' from 'this is a bad album' to 'this is a good album' on the 7th element in the list, how would i phrase that? i am kicking around: Album repository at: 7 desc: 'this is a good album' but i don't think the evaluation order is correct.. any ideas? thanks! -- ---- peace, sergio photographer, journalist, visionary http://www.coffee-black.com http://www.painlessfrugality.com http://www.twitter.com/sergio_101 http://www.facebook.com/sergio101

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Beginners March 2010