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Re: [Pharo-users] Why single inheritance?

by ClÃ©ment Bera

2015-01-28 16:41 GMT+01:00 Laura Risani <laura.risani(a)gmail.com>: > Hi all, > > What is the explanation why Smalltalk designers preferred single > inheritance+traits to multiple inheritance? Why is the former better than > the latter? > Do traits let you share state also or only behavior? > Traits only share behaviors. As you guessed, it is still questionable to many people if multiple inheritance is good because state can be inherited multiple times. For example, what do happen if C inherits from A and B and that both A and B have a field name i. There are existing solutions for this problem but they're all not perfect. Traits were implemented language-side only. If you want you can implement multiple inheritance language side only too (as for traits, you'll have to add virtual copies of methods and if state is shared too you'll have virtual copies of instance variables to run on our current VM), and see which one you prefer. I'd be glad to hear your feedback on that. > Best, > Laura >

Jan. 28, 2015

dirty packages

by Usman Bhatti

Hello, I have two packages MyPackage and MyPackage-Ext. When I load MyPackge-Ext, MyPackage becomes dirty and do not have any clue why. When I try to see changes in MyPackage in Monticello Browser, the package becomes clean again. There are two possibilities why MyPackage-Ext makes MyPackage dirty: -> There are names conflict of some sort (MyPackage-Ext can be seen as a category for MyPackage). -> Overriding of the extension methods introduced on the third package. Now I wrote a small script to verify it: firstCollection := (RPackage organizer packageNamed: 'MyPackage') extensionMethods values flatten. secondCollection := (RPackage organizer packageNamed: 'MyPackage-Ext') extensionMethods values flatten. (secondCollection intersection: firstCollection) The above script gives empty result so there are no overriding selectors. Any ideas how can I hack into Monticello to see what is causing MyPackage to become dirty while I load the second one manually. May be by logging the override load definitions on Transcript? In general, will it be possible to see overriding without these disappearing when doing changes on a dirty package? tx in advance. Usman

Jan. 28, 2015

Why single inheritance?

by Laura Risani

Hi all, What is the explanation why Smalltalk designers preferred single inheritance+traits to multiple inheritance? Why is the former better than the latter? Do traits let you share state also or only behavior? Best, Laura

Jan. 28, 2015

Re: [Pharo-users] SPEC and Athens

by Sebastian Heidbrink

Welcome to the world of Smalltalk! Am 28.01.2015 um 07:27 schrieb Mark Rizun: > I have the same problem with PolygonMorph. It does not resize properly. > Also I couldn't find any event related with window resizing. > If you find a solution please let me know. > > Mark > > 2015-01-28 16:19 GMT+01:00 Sebastian Heidbrink <sheidev(a)yahoo.de > <mailto:sheidev@yahoo.de>>: > > Am 28.01.2015 um 07:07 schrieb Mark Rizun: >> >> First the svg does not resive properly while resizing the window. >> >> >> What do you mean by this? > > Well, I implemented the example window from spec.st > <http://spec.st> and added a ASVGMorph to it. > When I now resize the window, then the button changes his size > correctly but the svg somhow just seems to be put into the background. > I then implemented a SVGMorpModel that includes a ASVGMorpAdapter > and adde dthis one to my example window but the result is that the > SVG resizes just half the speed... > > >> How can I also introduce an animated SVG? Like an svg that >> changes color during a mouse click? >> >> >> To work with events that are implemented in AthensSvgMorph you >> have to (as far as I know) access this morph. >> You can do it by sending #widget message to your model to times >> like this: >> >> svgModel widget widget ==> svgMorph >> >> Than morph can handle events like "changes color during a mouse >> click". >> >> Are there any particular Models that could be used as a >> container for this SVGMorphAdapter? >> >> >> SVGMorphAdapter is a class that represents a layer betwen >> SVGMorph and model of svg in spec. >> It allows model and morph to "communicate" with each other. >> >> Mark > >

Jan. 28, 2015

Re: [Pharo-users] Waiting object

by Laura Risani

Hi Ben , #fork let me implement the overall functionality i wanted, but i had to introduce some minor changes into the design to reflect the concurrent nature of the msg. So i still feel curious about how one could implement this msg Waiting>> wait : seconds "i take the flow control during 'seconds' without halting image morphs and only then return to the sender " Best, Laura On Tue, Jan 27, 2015 at 7:00 PM, Ben Coman <btc(a)openinworld.com> wrote: > Hi Laura, Can you provide some more context by pasting code for how you > expect both your UI and calculation methods to interact? What is the > application? > > cheers -ben > > On Wed, Jan 28, 2015 at 5:49 AM, Laura Risani <laura.risani(a)gmail.com> > wrote: > >> Hi all, >> Thank you for your answers. >> >> But i yet can't see how to implement the method i wanted, because #fork >> schedules the process and immediately returns but i'd like to wait and only >> then return the answer. >> >> >> Best, >> Laura >> >> On Tue, Jan 27, 2015 at 3:46 PM, Laura Risani <laura.risani(a)gmail.com> >> wrote: >> >>> Hi all, >>> >>> I need an object/method like this one >>> >>> Waiting>> wait : seconds >>> "i take the flow control during 'seconds' without halting image morphs >>> stepping/handling (as Delay>>wait: does) and then return to the sender " >>> >>> How can i implement it? >>> Where can i borrow for reuse an existing one from? >>> >>> >>> Best, >>> Laura >>> >> >> >

Jan. 28, 2015

Re: [Pharo-users] SPEC and Athens

by Mark Rizun

I have the same problem with PolygonMorph. It does not resize properly. Also I couldn't find any event related with window resizing. If you find a solution please let me know. Mark 2015-01-28 16:19 GMT+01:00 Sebastian Heidbrink <sheidev(a)yahoo.de>: > Am 28.01.2015 um 07:07 schrieb Mark Rizun: > > First the svg does not resive properly while resizing the window. >> > > What do you mean by this? > > > Well, I implemented the example window from spec.st and added a ASVGMorph > to it. > When I now resize the window, then the button changes his size correctly > but the svg somhow just seems to be put into the background. > I then implemented a SVGMorpModel that includes a ASVGMorpAdapter and adde > dthis one to my example window but the result is that the SVG resizes just > half the speed... > > > > >> How can I also introduce an animated SVG? Like an svg that changes >> color during a mouse click? >> > > To work with events that are implemented in AthensSvgMorph you have to > (as far as I know) access this morph. > You can do it by sending #widget message to your model to times like this: > > svgModel widget widget ==> svgMorph > > Than morph can handle events like "changes color during a mouse click". > > >> Are there any particular Models that could be used as a container for >> this SVGMorphAdapter? >> > > SVGMorphAdapter is a class that represents a layer betwen SVGMorph and > model of svg in spec. > It allows model and morph to "communicate" with each other. > > Mark > > >

Jan. 28, 2015

Re: [Pharo-users] SPEC and Athens

by Sebastian Heidbrink

Am 28.01.2015 um 07:07 schrieb Mark Rizun: > > First the svg does not resive properly while resizing the window. > > > What do you mean by this? Well, I implemented the example window from spec.st and added a ASVGMorph to it. When I now resize the window, then the button changes his size correctly but the svg somhow just seems to be put into the background. I then implemented a SVGMorpModel that includes a ASVGMorpAdapter and adde dthis one to my example window but the result is that the SVG resizes just half the speed... > How can I also introduce an animated SVG? Like an svg that changes > color during a mouse click? > > > To work with events that are implemented in AthensSvgMorph you have to > (as far as I know) access this morph. > You can do it by sending #widget message to your model to times like this: > > svgModel widget widget ==> svgMorph > > Than morph can handle events like "changes color during a mouse click". > > Are there any particular Models that could be used as a container > for this SVGMorphAdapter? > > > SVGMorphAdapter is a class that represents a layer betwen SVGMorph > and model of svg in spec. > It allows model and morph to "communicate" with each other. > > Mark

Jan. 28, 2015

Compatibility of Cypress, FileTree, STIG ?

by Damien Pollet

Hi all, I'm trying to exchange code between VW and Pharo, but STIG does not seem to generate the same properties, and puts comment at the start of method files instead of the method category name, which confuses FileTree on the Pharo end. Any suggestions? -- Damien Pollet type less, do more [ | ] http://people.untyped.org/damien.pollet

Jan. 28, 2015

Re: [Pharo-users] SPEC and Athens

by Mark Rizun

> > First the svg does not resive properly while resizing the window. > What do you mean by this? > How can I also introduce an animated SVG? Like an svg that changes color > during a mouse click? > To work with events that are implemented in AthensSvgMorph you have to (as far as I know) access this morph. You can do it by sending #widget message to your model to times like this: svgModel widget widget ==> svgMorph Than morph can handle events like "changes color during a mouse click". > Are there any particular Models that could be used as a container for this > SVGMorphAdapter? > SVGMorphAdapter is a class that represents a layer betwen SVGMorph and model of svg in spec. It allows model and morph to "communicate" with each other. Mark

Jan. 28, 2015

Re: [Pharo-users] SPEC and Athens

by Sebastian Heidbrink

Hi Mark, that works! Thanks! But I still hava a problem here. First the svg does not resive properly while resizing the window. The svg is part of a ComposibleModel How can I also introduce an animated SVG? Like an svg that changes color during a mouse click? Are there any particular Models that could be used as a container for this SVGMorphAdapter? I saw a project that added such funktionalities to SVGs like animations within Pharo, but I can't find it anymore. I assume that's why it wasn't continued? Thanks Sebastian Am 27.01.2015 um 08:02 schrieb Mark Rizun: > Hi, > > Not sure if it helps but for morphs you have next "transformation to > model": > > || morph| > > morph := CalendarMorph on: Date today. > ^ morph asSpecAdapter| > > Please read details here: > http://spec.st/docs/insert-morph/ > > Mark > > 2015-01-27 16:57 GMT+01:00 Sebastian Heidbrink <sheidev(a)yahoo.de > <mailto:sheidev@yahoo.de>>: > > Hi! > > Okay so I am currently trying Spec out and I need some advice. > > Which is the Model to use for a ASVGMorph ("AthensSvgMorph")? > > Is there an example availabel somewhere? > > Thanks > Sebastian > >

Jan. 28, 2015