Beginners May 2006

beginners@lists.squeakfoundation.org

65 participants
84 discussions

Multiple constructors
by Rich 12 May '06

12 May '06

I watched Stephane's Squeak videos (they helped alot btw) and was left wondering how one goes about making multiple constructors for a class. Is it even possible? Thank you. -Rich

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FW: how to set the cursor position in TextMorph
by Ron Teitelbaum 11 May '06

11 May '06

-----Original Message----- From: squeak-dev-bounces(a)lists.squeakfoundation.org [mailto:squeak-dev-bounces@lists.squeakfoundation.org] On Behalf Of Gary Chambers Sent: Thursday, May 11, 2006 4:25 PM To: The general-purpose Squeak developers list Subject: RE: how to set the cursor position in TextMorph If you want to use a TextMorph try the following: myTextMorph editor selectFrom: 2 to: 1. ActiveHand newKeyboardFocus: myTextMorph. myTextMorph changed > -----Original Message----- > From: squeak-dev-bounces(a)lists.squeakfoundation.org > [mailto:squeak-dev-bounces@lists.squeakfoundation.org]On Behalf Of Gary > Chambers > Sent: 11 May 2006 7:11 PM > To: The general-purpose Squeak developers list > Subject: RE: how to set the cursor position in TextMorph > > > Sorry, that was for PluggableTextMorph. Better to use the > pluggable version > IMO. > > > -----Original Message----- > > From: squeak-dev-bounces(a)lists.squeakfoundation.org > > [mailto:squeak-dev-bounces@lists.squeakfoundation.org]On Behalf Of Celal > > Ziftci > > Sent: 11 May 2006 3:34 AM > > To: squeak-dev(a)lists.squeakfoundation.org > > Subject: Re: how to set the cursor position in TextMorph > > > > > > I think a TextMorph doesnt have such a method called 'setSelection'. > > I tried running it but it doesn't understand the message. > > Thanks for the response though. > > > > - Celal > > > > > > ------------------------------------------------------------------ > > ------------------ > > > > How about > > > > myTextMorph setSelection: (7 to: 6) > > > > Or change the range to have a selection instead of a caret. > > > > > >

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Raw beginner asks.....
by Jeffrey Haun 11 May '06

11 May '06

I'm just starting out in Squeak and having a hard time of it. For one thing, I have a little experience with other programming languages, but I can't make the connection to squeak. I don't know where to start and most book I have seen are not for the absolute Squeak beginner. I have the "bots" book, but that seem more like a version of LOGO. How do you write program in this environment?? Help Jeff

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crossSum
by Enrico Schwass 11 May '06

11 May '06

Hello First of all. The creation of this mailinglist was a very good idea. Reading the original list I always felt wrong, because of the very high level of questions and ... yes answers. Thanks :) Anyway. I was looking for a crossSum Method for Integers. e.g. 251 crossSum (sometimes called checksum) should return 8 1234 -> 10 I couldnt find one with method finder. So I wrote one by myself. And a friend - also a smalltalk newbie - did another one. Probably both are not perfect. The first problem is: Where to put the new method? We decide to put it directly into Integer (arithmetic). There are no side effects, we guess. Are we right? Second, we dont know the class library very well. It tooks 20 min to find the smalltalk equivalent to != Its ~= for other newbies :) So we never know, if we are doing it the smalltalk way. It would be great if others post their solution and it could be a good example for describing the test first development cycle, too. Another area I am not so familiar with. But I am eager to learn this. BTW: How can I tell method finder to use new implemented methods for example search? 1. 2. 3. 4. 10 didnt show me crossSum. Have a nice day Enno

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Delegates, aliases, or ? How to deal with (avoiding) renaming
by Charles D Hixson 11 May '06

11 May '06

I'm trying to translate some C++ code into Sqeak (it's old, and doesn't use the stl). One of the first things it does is define a class called Vector. This appears to be the same as the FloatArray class...but not really the same. What I want to do is ... well, it OUGHT to be subclassing of FloatArray, but that class uses a bunch of primitive operations, so I can't really tell all that it's doing. Still... The main thing I'm doing here is the same thing that's being done in FloatArray, but with different names for the operations. So I usually want to use the new names as labels for the old operation. Is there a better way to do this than just subclass FloatArray and have each new method return the old method's calculation? When I get to Matrix, not only does it have the same name as an existing class (of which it apparently *ought* to be a subclass), but it implements methods like +, where Matrix says add: doNotImplement. Suggestions?

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Tip on gameapps
by Marcus Pedersén 10 May '06

10 May '06

Hi! I have a game idea that I'm about to start to program and I wonder iif there are any good tips to get a good start? It is supposed to be a kind of graphic game with 3:d view, are there any existing games that I can have a look at to get good ideas? Many thanks in advance! Marcus

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[Q] How should one concatenate Strings?
by Charles D Hixson 10 May '06

10 May '06

Example: repr "return a representation of THIS object" |ic| ic := self class. ^(#('<!' (self class) ';' name, '!>') asString). Unfortunately, not only is this clunky, it returns a string array rather than a character string. (Forgive any typos...I wanted a sensible example, but the reality was tested in the workspace.) What I want is to just return a character string built from other character strings, some of which may be computer and other of which might be literal. For example, what I might want returned could be the string '<!Android;Marvin!>'. The only way I've been able to figure out how to do this is to create a sufficiently long string (after calculating the length of each piece) and then to use at:put:

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FW: how to set the cursor position in TextMorph
by Ron Teitelbaum 10 May '06

10 May '06

_____ From: squeak-dev-bounces(a)lists.squeakfoundation.org [mailto:squeak-dev-bounces@lists.squeakfoundation.org] On Behalf Of Hernan Tylim Sent: Wednesday, May 10, 2006 1:17 PM To: The general-purpose Squeak developers list Subject: Re: how to set the cursor position in TextMorph Hi Celal, I don´t have a squeak image at hand so I can't give you exact names or working code, but what you need need to do is to check the class ParagraphEditor (or something like that). The text cursor (the caret) in Squeak is what in the text input classes is called an editor. The caret, is not really a cursor but a visual representation of the selection, which when has a size 0 looks like a normal cursor. Look at the ParagraphEditor and look at the method categories, and you will surely find methods that deals with cursor movement. Actually, somewhere in there you will find the exact code that is executed each time an arrow key is pressed. Regards, Hernán On 5/10/06, Celal Ziftci <celalziftci(a)gmail.com> wrote: Hi Frank, I think I'm getting the meaning of cursor wrong. So basicly what I want to do is the following. I want to set the caret position in the textmorph using some smalltalk code instead of using the mouse. As an example, assume I have the following text in a textmorph and | is the place my caret is currently at: smallt|alk Now I want to move the caret to another place like: sm|alltalk but not by clicking there, using some code instead. Is this possible at all? Do I need to imitate firing an event (something like mouse down event)? Thanks for any help. - Celal Ziftci ---------------------------------------------------------------------------- --------------------------------- ---------------------------------------------------------------------------- --------------------------------- ---------------------------------------------------------------------------- --------------------------------- > Hi Celal, > Better to know is what do you want to do. The accessor cursorWrapped: > work very well and brings the curosor of the TextMorph to the right > position. The little example below is how I try to get the answer on > your question. > "initialize the TextMorph" > karl := TextMorph new openInWorld. karl contents: 'here comes the mouse'. > "Show where the cursor is" > Transcript show: karl cursor;cr. > "result ==1" > "change the position of the cursor" > karl cursorWrapped: 6. > "Show where the cursor is" > Transcript show: karl cursor. > "result == 6" > Cheers, > Frank -------- Original Message -------- Subject: how to set the cursor position in TextMorph (09-Mai-2006 19:47) From: Celal Ziftci < celalziftci(a)gmail.com <mailto:celalziftci@gmail.com> > To: frank.urbach(a)schmees.com >> Hi, >> I am having problem in setting the cursor to a certain position in >> TextMorph. I am trying the cursorWrapped: message, but it seems to be >> not working (or I am misunderstanding its meaning). Any help or >> pointers would be appreciated. >> Thanks, >> >> - Celal Ziftci > > -- Saludos, Hernán

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FW: how to set the cursor position in TextMorph
by Ron Teitelbaum 10 May '06

10 May '06

-----Original Message----- From: squeak-dev-bounces(a)lists.squeakfoundation.org [mailto:squeak-dev-bounces@lists.squeakfoundation.org] On Behalf Of Celal Ziftci Sent: Wednesday, May 10, 2006 10:50 AM To: squeak-dev(a)lists.squeakfoundation.org Subject: Re: how to set the cursor position in TextMorph Hi Frank, I think I'm getting the meaning of cursor wrong. So basicly what I want to do is the following. I want to set the caret position in the textmorph using some smalltalk code instead of using the mouse. As an example, assume I have the following text in a textmorph and | is the place my caret is currently at: smallt|alk Now I want to move the caret to another place like: sm|alltalk but not by clicking there, using some code instead. Is this possible at all? Do I need to imitate firing an event (something like mouse down event)? Thanks for any help. - Celal Ziftci ---------------------------------------------------------------------------- --------------------------------- ---------------------------------------------------------------------------- --------------------------------- ---------------------------------------------------------------------------- --------------------------------- > Hi Celal, > Better to know is what do you want to do. The accessor cursorWrapped: > work very well and brings the curosor of the TextMorph to the right > position. The little example below is how I try to get the answer on > your question. > "initialize the TextMorph" > karl := TextMorph new openInWorld. karl contents: 'here comes the mouse'. > "Show where the cursor is" > Transcript show: karl cursor;cr. > "result ==1" > "change the position of the cursor" > karl cursorWrapped: 6. > "Show where the cursor is" > Transcript show: karl cursor. > "result == 6" > Cheers, > Frank -------- Original Message -------- Subject: how to set the cursor position in TextMorph (09-Mai-2006 19:47) From: Celal Ziftci <celalziftci(a)gmail.com> To: frank.urbach(a)schmees.com >> Hi, >> I am having problem in setting the cursor to a certain position in >> TextMorph. I am trying the cursorWrapped: message, but it seems to be >> not working (or I am misunderstanding its meaning). Any help or >> pointers would be appreciated. >> Thanks, >> >> - Celal Ziftci > >

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crossSum, an alternative implementation
by Markus Gaelli 10 May '06

10 May '06

Hi all, I just subscribed to the list and found that crossSum debate in the archives. I did an implementation a while ago for musinum, a fractal music generator, that can be found on squeakmap. (for a "professional implementation see also http://reglos.de/musinum ) I did it this way: Integer >> crossSumBase: aBase self < aBase ifTrue: [^ self]. ^ self \\ aBase + (self // aBase crossSumBase: aBase) Cheers, Markus

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Beginners May 2006