August 2010 - Pharo-dev - lists.pharo.org

[Pharo-project] Early days of an MVP framework
by Schwab,Wilhelm K Aug. 10, 2010

Aug. 10, 2010

Gary, I was on an unstoppable roll (salvaged early on by Andreas' bitblt coaching), until I needed to repeat a "complex" GUI component and wanted/insisted on doing so with some reuse. Seaside gives us components on web pages; we need them for GUI code too. I tried turning my presenter-like structures into factories that would add morphs to a single shell, but it fell apart when it came time to set the framing values. I was not particularly interested in fixing it, because if I could do that, I would simply build proper composite widgets using the fix. The problem appears to be in SystemWindow, which does some incredibly complicated things, all of which (correct me if I am wrong) would be unnecessary if only there were a good set of layout managers. I can get very simple-minded about things, but it would make a whole lot more sense to me to create rows and columns of widgets, adding splitters between them until the whole things behaves as intended, rather than writing code (present only in a top-level shell) that tries to split things up into rows using its own judgment. Not good. I realize you did not create the situation, and have done wonders to make it work far better than when you found it. Some time ago, I built an emulated widget framework for Dolphin, which I needed because the combination of Dolphin's view resources and Windows itself was too slow for what I was trying to do. That project included a somewhat strange set of layout classes, but the basics are present, and it is not Object Arts' IP. I ported the classes to Pharo and did some work on stub View and Presenter classes that I had added to Pharo largely to passify my code that I was importing from Dolphin. The layouts think in terms of emulated widgets, and I see no reason to change their minds: I might want to replicate the framework. However, dynamic typing and a couple of extra methods allow them to work with just about anything. My goals are modest. Being able to compose rows and columns would do a lot for me. Add splitters and the ability to fix the size of some items, and I could almost anything I would need. View class>>example | row column dot square out shell | dot := ( Form dotOfSize:100 ) asFormOfDepth:32. square := ( Form squareOfSize:100 ) asFormOfDepth:32. out := Array writeStream. row := ContainerView row. 2 timesRepeat:[ column := row addSubview:ContainerView column. 2 timesRepeat:[ out nextPut:( column addSubview:ImageView new ). ]. ]. out contents with:{ dot copy. square copy. square copy. dot copy. } do:[ :view :form | view morph image:form. ]. row rectangle:( 0@0 extent:400@400 ). row layout. shell := StandardWindow labelled:'Hello MVP'. ^shell addMorph:row morph frame:( 0@0 extent:1@1 ); yourself. The above code produces an array of dots and squares, as intended. One quirk is that the grid does not resize as the shell resizes, a consequence of my not having hooked it up to resize events. I might get some interesting meltdowns once I begin to do that =:0 I used your PanelMorph as the "view" associated with ContainerView. What, ContainView isn't a view??? No. The code is biased toward Morphic, but hopefully the same code should extend to wx, GTK, etc. Dolphin's views have a handle instance variable to control the external resource; these views have an instance variable pointing to their morph. Handling of sub views works pretty much as in Dolphin: any view/morph can have children, but adding them is "legal" only for composites. Most systems I have seen treat coordinates relative to the parent/owner, but not Morphic. I remember seeing plans to make the change, but nothing after that. The view instances provide a natural place to fix things, so I took the plunge. If we switch to some other graphical realization, we can simply remove the the transformation. Are the existing splitters as strange as SystemWindow? By that I mean, would it be reasonable to add them between other morphs and look for events from them, or will they have to be replaced? I will eventually need splitters, but I could initially live without them if I can get reliable composition where I need it. There are very few view classes at present. MorphView can wrap almost anything, so it might be better to create a rich set of presenters instead. Dolphin's view resources are going to be interesting to replace. There are some complexities that I suspect are in deference to Windows, and some that might be avoidable. For our purposes, it might be enough to use SIXX to serialize a bunch of message sends and gzip the results to save memory. Another option might be to rely on class methods; having full closures won't hurt; they might allow sufficient hooking that resources in the Dolphin sense won't even be necessary. The desire for them quickly arises because views get realized in places know nothing about how the views should be configured; at least I think that is what happened to me after just a couple of hours. I am far less interested in having a graphical view editor than I am in being able to write **GOOD** code that assembles things as I want. If the result happens to allow a graphical editor too, so much the better. Any interest? Bill ----------------------------- View MorphViev ImageView ContainerView ViewGadgetLayoutAbstract ScrollerGadgetLayout NullViewGadgetLayout FixedStretchFixedGadgetLayout ProportionalGadgetLayout PreferredExtentsGadgetLayout GridGadgetRowsLayout VerticalListLayout

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[Pharo-project] Is there a good reason why ifEmpty: and ifNotEmpty: return nil rather than the receiver (as they do in Squeak) when the condition is false?
by jaayer Aug. 10, 2010

Aug. 10, 2010

In squeak, if you send ifEmpty: or ifNotEmpty: to a collection and the condition being tested (emptiness or non-emptiness) is false, then the receiver (the collection) is returned rather than nil. This is more useful and more in line with how ifNil: and ifNotNil: work (which each otherwise return the receiver). See this bug report for more information: http://bugs.squeak.org/view.php?id=6364

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[Pharo-project] List of Downloadable Tools
by Guillermo Polito Aug. 10, 2010

Aug. 10, 2010

Hi! I was looking for a Pharo Dev 1.2 image and I didn't find it... I guess it doesn't exists, so I want to make my own downloading a few tools like OB, eCompletion in a 1.2 Core image. So I began looking for gofer or metacello scripts to do it :P. I searched in the Collaboractive Book, the PBE, the mailing list... Finally looking some mails and browsing the MetacelloRepository, I figured out something like "*ConfigurationOfOmniBrowser project lastVersion load*" that succeded with a little help :P. Soo, after some time doing this a few questions come to my mind: -Is there an up to date list of the tools we pharoers count on and how to load them? I mean OB, eCompletion, FFI, Mondrian... -Is there a list of the tools current Dev images have? I found a ConfigurationOfPharo and I thought It should behave like that. Maybe there's a wiki or a webpage I'm missing. Thanks! Guille

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[Pharo-project] HTTP client library in Pharo?
by Andrei Stebakov Aug. 10, 2010

Aug. 10, 2010

I've been trying to find a library for Pharo/Squeak which would handle GET/POST requests with the ability to manage cookies and deal with https servers. The HTTPSocket that's included in Pharo doesn't have cookies support. I tried to find any library that handles cookies and there came up CurlPlugin and SWHTTPClient. SWHTTPClient page has a broken link to the source code (http://map.squeak.org/package/15f42ec1-e93e-4bcf-ab2b-6746ae9d413f) CurlPlugin package for Win32 that I found on the main project page fails most of the tests and can't retrieve any http data. I also found WebClient/WebServer library at http://www.squeaksource.com/@QY3MLGU4hU3c8qcE/2xQek_iM which also fails most tests after installation. I wonder what people in smalltalk community are using when they need to do some web scraping when they need to keep some session in cookies? What would be the best library to invest time into (I am very new to Smalltalk)? Thank you, Andrei

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[Pharo-project] Keyboard Shortcuts: Keymapping now loads in Pharo core 1.2
by Sean P. DeNigris Aug. 9, 2010

Aug. 9, 2010

To get the ball moving, I ported one of the keyboard shortcut packages, Keymapping, to Pharo. Maybe if we start playing with it, we'll see what works and what doesn't, and use it to create something great. The Metacello configuration is at http://www.squeaksource.com/Keymapping Sean -- View this message in context: http://forum.world.st/Keyboard-Shortcuts-Keymapping-now-loads-in-Pharo-core… Sent from the Pharo Smalltalk mailing list archive at Nabble.com.

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[Pharo-project] GDLib bindings?
by Andrei Stebakov Aug. 9, 2010

Aug. 9, 2010

I wonder what would be the right way in Smalltalk to use a popular graphics library such as gdlib? I use it currently from my current lisp-based web site to overlay text (using different fonts) on top of pre-defined png and jpeg images. Since I didn't find any smalltalk bindings (plugins?) for the library I wonder maybe there are some built-in tools in Pharo/Squeak that do the same job? Thank you, Andrei

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[Pharo-project] [update 1.2] #12085
by Marcus Denker Aug. 9, 2010

Aug. 9, 2010

12085 ----- Issue 2774: UTF16TextConverter incorrectly writes/does not write BOMs in different circumstances Issue 2765: SocketStreamTest are green in Squeak and hang on Pharo (add test) -- Marcus Denker -- http://www.marcusdenker.de INRIA Lille -- Nord Europe. Team RMoD.

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[Pharo-project] XML Parser, Monticello and unicode?
by Norbert Hartl Aug. 9, 2010

Aug. 9, 2010

I'm trying to port the newest XML Parser from squeaksource to gemstone. In XML-Parser-AlexandreBergel.73 there is a unicode test introduced with a longer unicode xml snippet. From this release on I cannot load or merge anything. Besides that the xml snippet looks very strange it loads in pharo but not in gemstone. Unpacking the mcz on the console and examine the content showed that the encoding is indeed weird. I don't know what it is but it is neither ascii nor utf-8. Pharo loaded the snippet into a WideString instance. How does monticello handle WideString instances when written to a file? Norbert

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[Pharo-project] Pharocasts: Web application testing through Selenium-RC
by laurent laffont Aug. 8, 2010

Aug. 8, 2010

http://pharocasts.blogspot.com/2010/08/web-application-testing-through.html WebTester is a framework to test web applications. Designed to support several testing systems, it actually provides an implementation which uses Selenium RC. You can test a any web application with it; but if you are developing Seaside applications you can take a component (any component), and unit test that component. For me the cool part is that with this sort of tool it's easy to open the entreprise backdoor to Pharo. Pharo + WebTester can quickly integrate an existing (web) development based on other tools / languages. Christoph's voice should arrive soon. Cheers, Laurent Laffont http://pharocasts.blogspot.com/ http://magaloma.blogspot.com/

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[Pharo-project] [update 1.2] #12084
by stephane ducasse Aug. 8, 2010

Aug. 8, 2010

12084 ----- - Issue 2760: More robust handling of HTTP upload responses. Thanks Andreas Raab. - Issue 2753: introduce Smalltalk platform to forward to OSPlatform. - Issue 2761: Some Cog-specific VM attribute accessors - Issue 2763: SocketStream destroy. Thanks Andreas Raab. - Better xIllegal message. Thanks Nicolas Cellier - Better Rectangle class comment. Thanks Nicolas Cellier Stef

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