January 2015 - Pharo-dev - lists.pharo.org

Issue 12970 - 16 steps to get through #halt - PROPOSED FIX
by Ben Coman Feb. 24, 2015

Feb. 24, 2015

I've found a fix for something that has annoyed me for a long time - but I can't determine what it might break. 1. In Workspace I evaluate the following Halt enableHaltOnce. a := 1. self halt. b := 2. self haltOnce. c := 3. Transcript show: a + b + c. 2. In the debugger after it stops at the #halt, it takes a SINGLE <Step Over> to move to d:=2 - no problem. 3. Now <Restart> and then <Step Over> down to c:=3 and observe: * the #halt now takes EIGHT (used to be SIXTEEN) steps to traverse (ouch!) * the #haltOnce takes THREE steps to traverse (good) Tracing through for both #halt and #haltOnce it seems that the specific conditional reference to #halt in Halt>>signalerContext is the difference! Removing that condition results in the #halt behaving like #haltOnce, taking only THREE <Step Over>s to traverse a restarted #halt. Halt>>signalerContext ^ signalContext findContextSuchThat: [ :context | (context receiver == self or: [ (context receiver == self class) or: [ context method selector = #halt ]]) not ] Now #haltOnce seems to have been operating without a problem for a long timer, so presumably its okay to make #halt behave the same way. But this is deep stuff I don't fully understand. Anyone see a problem with removing that last condition? cheers -ben

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[Slots] Invisible Slots
by Marcus Denker Feb. 24, 2015

Feb. 24, 2015

Hi, One of the power of slots is the concept of Virtual Slots that do not have an ivar to store their state. But of course, some uses fo this concept want to store state in the object. (e.g. imagine a property slot, all proper slots of the object would store into a property dictionary). The idea is that one can add iVars reflectively that are hidden from both introspection *and* the class definition. (the inspector should get a view to see reality, of course, similar to how we tread Dictionaries and OrderedCollection: The âbasicâ view is not relavant in most cases, it is just available in addition, the default is the high level view that is closer to the âmental modelâ of the programmer). https://pharo.fogbugz.com/f/cases/14786/Slots-add-HiddenInstanceVariableSlo… <https://pharo.fogbugz.com/f/cases/14786/Slots-add-HiddenInstanceVariableSlo…> -> Add a sublass of normal invar slots that is hidden -> change #slots of Behavior to return #allVisibleSlots Next: When building classes with Slots, the class builder need to call back on the slot and hand the class to each. Then the slot can reflectively change the class, e.g. the PropertySlot will check if there is already a hidden property base slot and if not, add it reflectively). Marcus

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Recover lost changes | Where are class definitions?
by Noury Bouraqadi Feb. 16, 2015

Feb. 16, 2015

Hi, I tried recovering code lost when an image quits without saving. But, in the "Recent changes", I don't see class definitions. I tesed this in Pharo 3 latest and in Pharo 4 latest too. Is there an option to display them? I guess they are hidden with other "DoIts", but I can't figure out how to display them back. Thanx, Noury

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changing Spec tab after opening throws MNU
by Peter UhnÃ¡k Feb. 12, 2015

Feb. 12, 2015

Changing Tab name after the UI has been build fails, since it tries to set the label to MorphicTabAdapter instead of Tab. I could fix it by changing in TabModel>>initialize label whenChangedDo: [ :new | self widget ifNotNil: [ :w | w label: new ] ]. to label whenChangedDo: [ :new | self widget ifNotNil: [ :w | w widget label: new ] ]. but setting it this way feels weird (not mentioning Demeter). Maybe the MorphicTabAdapter should delegate it? Apart from label this also applies to icon and most likely to all other stuff (morph, retrievingBlock, ...) Peter

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Installing Pharo on Ubuntu
by J.F. Rick Feb. 11, 2015

Feb. 11, 2015

I have a new computer and installed Ubuntu 14.10 on it. When I tried to install Pharo using the PPA instructions, it failed. I get the following message when executing "sudo apt-get update": W: Failed to fetch http://ppa.launchpad.net/pharo/stable/ubuntu/dists/utopic/main/binary-amd64… 404 Not Found W: Failed to fetch http://ppa.launchpad.net/pharo/stable/ubuntu/dists/utopic/main/binary-i386/… 404 Not Found I was able to get Pharo running with the Zeroconf script, but I thought I'd report that the standard thing didn't work. Is it just that a binary doesn't yet exist for 14.10. Cheers, Jeff -- Jochen "Jeff" Rick, Ph.D. http://www.je77.com/ Skype ID: jochenrick

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TROSMTileProvider
by Sven Van Caekenberghe Feb. 10, 2015

Feb. 10, 2015

Hi Thierry, Onil, First let me iterate what I wrote last week, the OSM stuff in Roassal is very cool, very well written. Great work. Since I have some experience with OSM maps, tiles and serving them, I had a look to see if I could optimise the tile drawing/loading, which is visibly a bit slow, one would assume because of the loading of the tiles over the network. I just committed (based on code that I wrote some time ago): === Name: Roassal2-SvenVanCaekenberghe.719 Author: SvenVanCaekenberghe Time: 28 January 2015, 2:31:50.462461 pm UUID: 0978fb6a-d6d0-4d86-a9ae-1f2f83a0b6a2 Ancestors: Roassal2-AlexandreBergel.718 Experimental branch. Introduction of TROSMTileProvider to optimize getting OSM tiles, adds one shared memory cache and a local file system cache, predefines and reuses 6 http clients spread over different hosts. Modifies TROSMShape>>#getTile: and adds TROSMShape>>#tileNamed: === The strange thing is though, that I can optimise the loading (as benchmarked separately), but in most cases (not when they are in the memory cache, but when they are in the file cache) the drawing still has the same pauses as before - which I don't understand, at all. But it is a bit hard to explain. Anyway, Thierry, I will see you tomorrow and the day thereafter and I hope I can show you what I mean. Regards, Sven

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Package cleaning
by Torsten Bergmann Feb. 9, 2015

Feb. 9, 2015

Hi Marcus, Ben and others, how can we proceed on META issue https://pharo.fogbugz.com/f/cases/14447? Anyone with deeper knowdlege of Monticello and the integration process able to help here? It's a merging issue although nothing to merge. Thx T.

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Re: [Pharo-dev] review request
by Ben Coman Feb. 5, 2015

Feb. 5, 2015

I know everyone is busy and working in their own domains not having the time to review a lot of other people's issues. However I am on my own, not part of a team where I can walk over and tap someone on the shoulder to ask for review of an issue I've resolved. It is a bit discouraging not to be able to proceed for lack of review. I'd be glad for any feedback including "its crap, do it a different way". So consider this a virtual should tap. I have... * refactored the two calls to #forMilliseconds: out to a single call * replaced call to #wait with #waitOr: * added #waitOr: Here is the diff... WorldState >> interCyclePause: milliSecs | currentTime wait | self serverMode ifFalse: [ (lastCycleTime notNil and: [CanSurrenderToOS ~~ false]) ifTrue: [ currentTime := Time millisecondClockValue. wait := lastCycleTime + milliSecs - currentTime. + "wait is the time remaining until milliSecs has passed + since lastCycle. If wait is zero or less, no need to Delay" + "If wait is greater than milliSeconds then bypass Delay, + by setting wait to zero." - (wait > 0 and: [ wait <= milliSecs ] ) ifTrue: [ - (Delay forMilliseconds: wait) wait ] ] ] + wait > milliSecs ifTrue: [ wait := 0 ] ] ] "btw, wait>milliSecs can only occur when clock rolls over. Eliminate after integrating issue 14353 ?" - ifTrue: [ (Delay forMilliseconds: 50) wait ]. + ifTrue: [ wait := 50 ]. + wait > 0 ifTrue: [ + (Delay forMilliseconds: wait) waitOr: [ + self inform: 'WorldState>>interCyclePause failed.' ] ]. lastCycleTime := Time millisecondClockValue. CanSurrenderToOS := true. "--------------------------" +Delay >> waitOr: anErrorBlock + self schedule. + [ beingWaitedOn + ifTrue: [ delaySemaphore wait ] + ifFalse:[ anErrorBlock value ] + ] ifCurtailed:[self unschedule]. +"Only the high priority timer event loop (TEL) signals /delaySempahore/. If the + TEL is not running, a delay will block forever (for example the UI will lock up). + /beingWaitedOn/ is only set to true from the TEL (via + DelayScheduler>>scheduleDelay: and Delay>>timingPriorityWaitedOn:) so test + this to determine if TEL is running. Avoid waiting when the TEL is not running." "--------------------------" This is for issue 14669 "Delay refactoring (part 2a) - avoid UI locking up when timer event loop is stopped" that is required to facilitate integration of issue 14353 "Delay refactoring (part 2) - change from milliseconds to microseconds. cheers -ben https://pharo.fogbugz.com/default.asp?14669 https://pharo.fogbugz.com/default.asp?14353

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Who are the experts?
by Roberto Minelli Feb. 4, 2015

Feb. 4, 2015

Dear all, I have some questions about the following topics: Morphic, the Zinc-HTTP-Client-Server, and NautilusRefactoring. I am wondering if someone can help ;) I am visiting RMoD @ INRIA these days (I am now sitting at the âvisiting tablesâ @ 3rd floor of INRIA). If someone is willingness to help, please come forward! To get an idea (and hopefully to collect some answers from people outside of Lille) here are my doubts ### Morphic - How can I assess the âz indexâ of windows? For each window Iâd like to know the % that is visible on screen, i.e., not covered from other windows. - Is there a âgeneral patternâ on how to extract which entity is âdisplayedâ on a window? In System Browsers is easy, what about other types of windows? ### Zinc-HTTP-Client-Server - How can I do a real upload (HTTP post) in background? ### NautilusRefactoring - How does it work? Why there are different methods to remove a class, for example? e.g., NautilusRefactoring>>#removeClasses: vs. AbstractTool>>#removeClasses: - Why #removeClasses: is triggered before the actual removal (i.e., confirmation dialogue)? Cheers and thanks in advance, Roberto

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Anonymous classes should be browseable
by HernÃ¡n Morales Durand Feb. 3, 2015

Feb. 3, 2015

I want to discuss case 14789 ( https://pharo.fogbugz.com/f/cases/14789/Nautilus-assumes-a-class-always-und…) because a class should be browseable even without a definition. Anonymous classes are still classes. If Nautilus project cannot deal with the whole Smalltalk power then it is poorly designed and I wonder what's the advantage over the old OmniBrowser... HernÃ¡n

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