- Pharo-users - lists.pharo.org

Re: [Pharo-users] Spec: Setting rows height of a pictures list

by Matteo

Thanks Nicolai, unfortunately, even using images of the same height I obtain a list with thin rows. Maybe I'm typing something wrong. I'll try to figure out how to handle this. Please let me know, if you have any further suggestion. Thanks, Matteo On 31/10/16 12:26, Nicolai Hess wrote: > > > 2016-10-31 10:19 GMT+01:00 Matteo via Pharo-users > <pharo-users(a)lists.pharo.org <mailto:pharo-users@lists.pharo.org>>: > > > > ---------- Weitergeleitete Nachricht ---------- > From: Matteo <matteob8(a)yahoo.it <mailto:matteob8@yahoo.it>> > To: "Pharo is welcome (ML)" <pharo-users(a)lists.pharo.org > <mailto:pharo-users@lists.pharo.org>> > Cc: > Date: Mon, 31 Oct 2016 10:18:03 +0100 > Subject: Spec: Setting rows height of a pictures list > Hi, > I've created a list of pictures, i.e. a widget based on > ListModel where > each item is a ImageModel. > > When the widget is displayed I get list window with very > thin rows. > > Is there a way to control the ListModel rows height? > > > Not if the images have different heights (you can, but it looks > terrible, because the underlaying list morph does not work for list > items with different heights). > > > > > Thanks, > Matteo > > >

Oct. 31, 2016

Re: [Pharo-users] How does Boolean ifTrue work?

by jtuchel＠objektfabrik.de

When I teach Smalltalk, this is one of the most beautiful exercises for students. Those who get it will love Smalltalk, those who don't often leave the project soon ;-) BTW: This is not a visitor or any other pattern, it really is just Polymorphism at work and the reason why back in the 90ies, people said if statements should be replaced by Polymorphism Joachim Am 31.10.16 um 14:17 schrieb CodeDmitry: > I am looking at > > ifTrue: alternativeBlock > "If the receiver is false (i.e., the condition is false), then the value is > the > false alternative, which is nil. Otherwise answer the result of evaluating > the argument, alternativeBlock. Create an error notification if the > receiver is nonBoolean. Execution does not actually reach here because > the expression is compiled in-line." > > self subclassResponsibility > > In order to perform the block, ifTrue must somehow end up evaluating the > block, but this code only sends a subclassResponsibility message to itself > and implicitly returns itself. > > Where does the block actually get evaluated? > > > > > -- > View this message in context: http://forum.world.st/How-does-Boolean-ifTrue-work-tp4920873.html > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > > -- ----------------------------------------------------------------------- Objektfabrik Joachim Tuchel mailto:jtuchel@objektfabrik.de Fliederweg 1 http://www.objektfabrik.de D-71640 Ludwigsburg http://joachimtuchel.wordpress.com Telefon: +49 7141 56 10 86 0 Fax: +49 7141 56 10 86 1

Oct. 31, 2016

Re: [Pharo-users] How does Boolean ifTrue work?

by CodeDmitry

But still, how is the actual argument "alternativeBlock" passed to the True/False from a Boolean? The message does not cache the message inside itself before passing the message, and it does not pass the alternative block along with the message. -- View this message in context: http://forum.world.st/How-does-Boolean-ifTrue-work-tp4920873p4920886.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Oct. 31, 2016

Re: [Pharo-users] How does Boolean ifTrue work?

by Thierry Goubier

Hi Dmitry, you found it yourself, sort of! Le 31/10/2016 Ã 14:25, CodeDmitry a Ã©crit : > Wait, so unlike JavaScript; True and False are actual singletons and > ifTrue/ifFalse/ifTrue:ifFalse: uses visitor pattern to have the actual True > or False handle the block rather than doing it themselves? Yes, true and false are singletons (resp single instance of the True class, False class). No, this is not a visitor pattern, just polymorphism (True and False have their own implementation of ifTrue:/ifFalse:/ifTrue:ifFalse:/ifFalse:ifTrue:). Regards, Thierry

Oct. 31, 2016

Re: [Pharo-users] How does Boolean ifTrue work?

by Nicolas Passerini

Well, in fact Boolean class has no instances, the boolean value true is an instance of True class, you should look at the ifTrue: methods in the subclasses of Boolean True and False. But also, ifTrue: expressions are inlined, as the comment says in the code you posted. So I think that all this ifTrue: methods are never actually executed. 2016-10-31 14:17 GMT+01:00 CodeDmitry <dimamakhnin(a)gmail.com>: > I am looking at > > ifTrue: alternativeBlock > "If the receiver is false (i.e., the condition is false), then the > value is > the > false alternative, which is nil. Otherwise answer the result of > evaluating > the argument, alternativeBlock. Create an error notification if the > receiver is nonBoolean. Execution does not actually reach here > because > the expression is compiled in-line." > > self subclassResponsibility > > In order to perform the block, ifTrue must somehow end up evaluating the > block, but this code only sends a subclassResponsibility message to itself > and implicitly returns itself. > > Where does the block actually get evaluated? > > > > > -- > View this message in context: http://forum.world.st/How- > does-Boolean-ifTrue-work-tp4920873.html > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > >

Oct. 31, 2016

Re: [Pharo-users] How does Boolean ifTrue work?

by Cyril Ferlicot D.

On 31/10/2016 14:17, CodeDmitry wrote: > I am looking at > > ifTrue: alternativeBlock > "If the receiver is false (i.e., the condition is false), then the value is > the > false alternative, which is nil. Otherwise answer the result of evaluating > the argument, alternativeBlock. Create an error notification if the > receiver is nonBoolean. Execution does not actually reach here because > the expression is compiled in-line." > > self subclassResponsibility > > In order to perform the block, ifTrue must somehow end up evaluating the > block, but this code only sends a subclassResponsibility message to itself > and implicitly returns itself. > > Where does the block actually get evaluated? > > Hi! Boolean is only an abstract class. You never manipulate a Boolean, you manipulate True or False. The #ifTrue: method works with a dispatch between True and False. Try to check: `True browse` or `False browse` :) > > > -- > View this message in context: http://forum.world.st/How-does-Boolean-ifTrue-work-tp4920873.html > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > -- Cyril Ferlicot http://www.synectique.eu 2 rue Jacques PrÃ©vert 01, 59650 Villeneuve d'ascq France

Oct. 31, 2016

Re: [Pharo-users] How does Boolean ifTrue work?

by Sven Van Caekenberghe

> On 31 Oct 2016, at 14:17, CodeDmitry <dimamakhnin(a)gmail.com> wrote: > > I am looking at > > ifTrue: alternativeBlock > "If the receiver is false (i.e., the condition is false), then the value is > the > false alternative, which is nil. Otherwise answer the result of evaluating > the argument, alternativeBlock. Create an error notification if the > receiver is nonBoolean. Execution does not actually reach here because > the expression is compiled in-line." > > self subclassResponsibility > > In order to perform the block, ifTrue must somehow end up evaluating the > block, but this code only sends a subclassResponsibility message to itself > and implicitly returns itself. > > Where does the block actually get evaluated? In the sub classes of Boolean, True and False. Have a look at ALL implementors of #ifTrue: or #ifFalse: There is only one instance of True, the constant true, same for False and false. HTH, Sven > > > > -- > View this message in context: http://forum.world.st/How-does-Boolean-ifTrue-work-tp4920873.html > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. >

Oct. 31, 2016

Re: [Pharo-users] How does Boolean ifTrue work?

by CodeDmitry

Wait, so unlike JavaScript; True and False are actual singletons and ifTrue/ifFalse/ifTrue:ifFalse: uses visitor pattern to have the actual True or False handle the block rather than doing it themselves? -- View this message in context: http://forum.world.st/How-does-Boolean-ifTrue-work-tp4920873p4920878.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Oct. 31, 2016

How does Boolean ifTrue work?

by CodeDmitry

I am looking at ifTrue: alternativeBlock "If the receiver is false (i.e., the condition is false), then the value is the false alternative, which is nil. Otherwise answer the result of evaluating the argument, alternativeBlock. Create an error notification if the receiver is nonBoolean. Execution does not actually reach here because the expression is compiled in-line." self subclassResponsibility In order to perform the block, ifTrue must somehow end up evaluating the block, but this code only sends a subclassResponsibility message to itself and implicitly returns itself. Where does the block actually get evaluated? -- View this message in context: http://forum.world.st/How-does-Boolean-ifTrue-work-tp4920873.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Oct. 31, 2016

UDP Socket primitive failure

by Dimitris Chloupis

Hey guys I try to use Pharo to use Supercollider via OSC. OSC library is maintained by Stef in STHub. So SC informs that it receives the messages sent, but in Pharo I am getting annoying Primitive errors that I paste bellow. Anyone knows if this a bug or something missing here ? Also SC sometimes it informs me that the message was received in a different port than it was sent. Here the code I am using (OSCMessage for:{'/mixer.volume'. 1 . 0.2})sendTo: '127.0.0.1' port: 57120. Any help greatly appreciated. Supercollider is an application which is basically a server written in C++ that does music composition and audio synthesis live , its extremely powerful and the top professional audio tool for audio synthesis and music live coding. http://supercollider.github.io Socket(Object)>>primitiveFailed: Socket>>errorSending:startingAt:count:toHost:port: Socket>>primSocket:sendUDPData:toHost:port:startIndex:count: Socket>>sendUDPData:toHost:port: OSCMessage(OSCPacket)>>sendTo:port: UndefinedObject>>DoIt OpalCompiler>>evaluate RubSmalltalkEditor>>evaluate:andDo: RubSmalltalkEditor>>highlightEvaluateAndDo: [ textMorph textArea editor highlightEvaluateAndDo: ann action. textMorph shoutStyler style: textMorph text ] in [ textMorph textArea handleEdit: [ textMorph textArea editor highlightEvaluateAndDo: ann action. textMorph shoutStyler style: textMorph text ] ] in GLMMorphicPharoScriptRenderer(GLMMorphicPharoCodeRenderer)>>actOnHighlightAndEvaluate: in Block: [ textMorph textArea editor highlightEvaluateAndDo...etc... RubEditingArea(RubAbstractTextArea)>>handleEdit: [ textMorph textArea handleEdit: [ textMorph textArea editor highlightEvaluateAndDo: ann action. textMorph shoutStyler style: textMorph text ] ] in GLMMorphicPharoScriptRenderer(GLMMorphicPharoCodeRenderer)>>actOnHighlightAndEvaluate: in Block: [ textMorph textArea... WorldState>>runStepMethodsIn: WorldMorph>>runStepMethods WorldState>>doOneCycleNowFor: WorldState>>doOneCycleFor: WorldMorph>>doOneCycle [ [ World doOneCycle. Processor yield. false ] whileFalse: [ ] ] in MorphicUIManager>>spawnNewProcess in Block: [ [ World doOneCycle.... [ self value. Processor terminateActive ] in BlockClosure>>newProcess in Block: [ self value....

Oct. 31, 2016