Beginners August 2019

beginners@lists.squeakfoundation.org

10 participants
20 discussions

Morphs that never gain mouse focus?
by Christoph Thiede 08 Sep '19

08 Sep '19

Hi, I'm wondering whether Morphic currently supports any way to hinder a morph from being ever given mouse focus. There are multiple scenarios where I could need something like this. For example. an Autocompletion menu morph should never gain mouse focus <https://github.com/MrModder/Autocompletion/issues/31#issue-472835222> , but currently it overrides #handleMouseEnter: and transfers the focus to its containing morph. The problem with this approach seems to me to be that, when hovering the menu morph, the MouseOverHandler first sends #mouseLeave: to the containing text morph -- before the menu morph can decide to forward the focus event. Ultimately, the focus is consistent, but I do not want #mouseLeave: to be sent at all, as some text morphs <https://github.com/hpi-swa-teaching/SpreadSheetTool/tree/master/packages/Sp…> may show undesirable behavior when loosing focus. I am also running another project where I never want a morph to gain mouse focus from a similar reason. The only Morph in Squeak I remember to never gain focus is the HaloMorph, what is apparently achieved by an extra-check in PasteUpMorph>>#filterEvent:for: where the event is ignored in #tryInvokeHaloFor: before passing it to MouseOverHandler. Manipulating a PasteUpMorph method does not seem appropriate for a small tool. tl;dr: Is it possible to forbid a morph to gain focus at the expense of the current focused morph? If not, would you know any better approach? Or would this even be a possible feature proposal for squeak/dev? Thanks in advance! Best, Christoph -- Sent from: http://forum.world.st/Squeak-Beginners-f107673.html

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Continue/Ignore error
by gettimothy 03 Sep '19

03 Sep '19

Hi folks. The following code is working very well, but when an Error occurs, I would like it to ignore the error and continue. Transcript clear. [(WikitextModule allSubclasses select:[:module | (module pagetitle indexOf:$/ ifAbsent:[0]) > 0]) do:[:m | |ss f d cmd shell content ios| ss := m pagetitle squeakToUtf8 findBetweenSubStrs: '/'. d := ss collect:[:each | each] from: 1 to: (ss size -1). "handle Sandbox and User: here" ((d at:1) = 'Sandbox') | ((d at:1) beginsWith:'User:') ifTrue:[] ifFalse:[ d := d inject:'' into:[:a :b | a, '/', b]. f := ('lua',d, '/', ss last, '.lua') squeakToUtf8 . "ios writes to shared by default" cmd := 'mkdir -p shared/lua', d. "commandshell writes to squeak root directory, so we prepende 'shared' to it" Transcript show: (m name), ' : ', cmd; cr. shell := PipeableOSProcess bash. shell pipeFromOutput reader setNonBlocking. shell exec: cmd. (Delay forMilliseconds: 400) wait. Transcript show: shell upToEnd ; cr. shell close. content := m lua squeakToUtf8. ios := FileStream newFileNamed: f. ios isNil ifFalse:[ content storeOn: ios. ios close. ]]. ]] ifError:[:x :y | Transcript show: x;cr. y close. thisContext resume] The error is WikitextModule613405370 : mkdir -p shared/lua/Road_data/strings/USA/KY Error: cannot create OS pipe I am assuming it is happening during the mkdir -p command during the shell sequence of code in bold above but that is not my question. Although it could be happening in the ios portion. My question is how, after the Error is thrown do I continue the 'do:[:m...] block? thanks for your time.

3 3

Rich text editor for Squeak ?
by Nicola Mingotti 31 Aug '19

31 Aug '19

Hi, I was wandering, do we have something similar to StyledTextEditor in Squeak ? https://github.com/Cuis-Smalltalk/StyledTextEditor I red a few words about a project called OpenSophie, but it seems it died 10 years ago when it was decided to port it to Java. Do you know where I can find some video illustrating what it was capable of ? There is in SqueakSource 'SohieGoldDig' but it does not load, complaining there miss several classes. bye Nicola

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CommandShell/OSPRocess primCreatePipe failing. How to debug?
by tty 30 Aug '19

30 Aug '19

In ExternalPipe>> makePipe | t1 | *t1 := OSProcess accessor makePipeHandles.* t1 isNil ifTrue: [self error: 'cannot create OS pipe'] ifFalse: [self reader: (AttachableFileStream name: 'pipeReader' attachTo: (t1 at: 1) writable: false). self writer: (AttachableFileStream name: 'pipeWriter' attachTo: (t1 at: 2) writable: true)] OSProcess accessor is a * 'a UnixOSProcessAccessor on pid 19790'* Where *self makePipeHandles* returns and undefined object. How should I think about this? thnks -- Sent from: http://forum.world.st/Squeak-Beginners-f107673.html

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Repeated text search in a Workspace
by Nicola Mingotti 30 Aug '19

30 Aug '19

Hi, I would like to know if it is possible in Squeak 5.2 to repeat a text search multiple times in a Workspace. Example. To search 'string' I do Ctrl+f, then I type 'string', then I press return. The first occurrence of 'string' is found and highlighted. But now, how can I go on and get the other matches in the page ? Is there a shortcut for that ? I saw that if I re-do Ctrl+f and re-type 'string' I get what i want but that is too much impractical to be a good method. bye Nicola

3 3

fascinating behavior when dealing with 574217 templates
by gettimothy 28 Aug '19

28 Aug '19

Hi all, posting to squeak-dev cause I think it will intrigue you. I am importing 574217 Wikimedia templates into Squeak in an attempt to create a fast parser. I have developed two approaches. 1. dynamically create a class for each template. 2. add a template wrapped in an abject and store that in a Class Instance Variable Dictionary. (I am storing objects in a class variable) 1. I prefer as I like the idea and I am curious about how many classes we can load into Squeak. I tried to load all 574217 classes at once, but it took too long. (and I had no user feedback, hence my question on progress bars) Therefore, I broke the task into 5000 record batches. Interestingly, as I do this, it starts out VERY fast, but with each new batch the performance degrades very fast. Its like the more subclasses of a class I add, the harder it gets to add them. 2. I do not like the idea of storing objects in a Class Instance Variable. Why? Putting objects in a Class feels like a gravy stain on my best t-shirt. However, loading all 574217 objects finished within 1 5000 class load batch run. Why? I have no idea. Figured you all would find the phenomenon interesting. The generic questions of "How many classes can we hold in an image" and "How quickly can we create them" are interesting things in themselves. Squeak Classes are very much like a Database/SQL environment and easy to work with. Cheers. tty

2 1

How to access a remote PostgreSQL db
by Nicola Mingotti 26 Aug '19

26 Aug '19

Hi, I would like to know if there is a package let me access a PostgresSQL db on a remote computer. PGSqueak ? [ I can't find the code] I don't need to do complex stuff, just run a SELECT and retrieve some rows. I am exploring the possibility of using Squeak to make a GUI and keep under control a solar power plant. bye Nicola

3 3

Saving the image during import and dynamic creation of ~ 1/2 million classes.
by gettimothy 26 Aug '19

26 Aug '19

Hi all. I am on a bit of a kick where I dynamically create classes and have them render themselves. For example at http://menmachinesmaterials.com/SeasideDoc On the left menu under SWIKI, I have scraped the Squeak Wiki pages, dynamically created WAComponent subclasses that wrap their data and I ask them to display themselves on the web page. IIRC there are about 6000 Swiki pages/classes there.* Its a nice model with a lot of power and possibilities. I am on a different project where I am doing something very similar, but this time there are ~570000 classes to create. Herein my question. As I import these things, should I and how often should I use Smalltalk saveSession; garbageCollect. ? My thinking is that as I create these things, they are held in "Smalltalk memory" whatever that is and that as the amount of stuff in "Smalltalk Memory" increases, performance drops and eventually you hit the limit of what "Smalltalk Memory" can do. So, to mitigate this perhaps imaginary limitation, I am doing a Smalltalk saveSession; garbageCollect every 5000 classes created. Is this the correct thing to do? What misperceptions may I be harboring? Thanks in advance. tty

1 0

Modified basic Connectors intro video, please check it !
by Nicola Mingotti 25 Aug '19

25 Aug '19

Hi Guys, I put a comment in one of Lawson English introductory video to Connectors, here: https://www.youtube.com/watch?v=QBRm_hnl7sE I guess it would be better if some of you give it a check and confirm the changes I propose make the thing run ! bye Nicola

1 0

Just playin' around
by Michael Rice 13 Aug '19

13 Aug '19

A TextMorph (string '15') and two SimpleButtons, one with a '+' and the other with a '-'. Target for both buttons is the TextMorph. The following, executed (with DoIt) in the bottom subwindow of the '+' button inspector increments the TextMorph by 1. (self target) contents: ((((self target) getNumericValue) + 1) printStringBase: 10). However, a Viewer for the '+' button seems to have no target variable. And a script for the button rejects "button up?" and "button down?" tests with error messages. Seems I'm trying to hook up some incompatible things. How would one hook up these three morphs, simply?

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Beginners August 2019