January 2013 - Pharo-users - lists.pharo.org

Re: [Pharo-users] Question about alias in traits

by StÃ©phane Ducasse

On Jan 10, 2013, at 2:17 PM, Damien Cassou wrote: > On Thu, Jan 10, 2013 at 1:21 PM, Hernan Wilkinson > <hernan.wilkinson(a)10pines.com> wrote: >> Was my interpretation of Alias incorrect? or is the current implementation >> of alias incorrect? (maybe due to some implementation problems?) > > @ is an Alias operator, not a Rename operator. That means when you > alias { #m3 -> #m1 } you get a new name for the same method. So what > you see is the expected behavior, as defined in the paper. And the > direction of the arrow makes sense: #m3 -> #m1 is read as "m3 is a new > name for m1", whereas for a Rename operator, we would probably have > something like "#m1 -> #m3", i.e., m1 is renamed to m3. In a fully > dynamic language, a Rename operator would be quite hard to implement I > guess, IIRC Eiffel has a rename operator. Not quite hard. doing it fully and correctly is no possible because you should distinguish the methods that should be renamed.

Jan. 10, 2013

Re: [Pharo-users] Question about alias in traits

by StÃ©phane Ducasse

> > I may have understood incorrectly the idea behind and alias when using traits, but I was expecting that when using an alias, the aliased method would be removed and all the sender of that message would be change to the new one (the alias), but I don't see that happening. You cannot do that in a dynamically typed language. Why because you do not know how to scope the method renaming. Aliasing is not renaming. Stef > Here is some code: > > Trait named: #SomeTrait > uses: {} > > SomeTrait>>m1 > ^ 1 > SomeTrait>>m2 > self m1 > > Object subclass: #SomeClass > uses: SomeTrait @ { #m3 -> #m1} > > It generates: > SomeClass>>m1 > ^ 1 > SomeClass>>m2 > self m1 > SomeClass>>m3 > ^1 > > But I was specting: > SomeClass>>m2 > self m3 > SomeClass>>m3 > ^1 > and the method SomeClass>>m1 removed. > > Was my interpretation of Alias incorrect? or is the current implementation of alias incorrect? (maybe due to some implementation problems?) > > Thanks! > Hernan. > > -- > HernÃ¡n Wilkinson > Agile Software Development, Teaching & Coaching > Phone: +54 - 011 - 6091 - 3125 > Mobile: +54 - 911 - 4470 - 7207 > email: hernan.wilkinson(a)10Pines.com > site: http://www.10Pines.com > Address: Alem 693, Floor 5 B, Buenos Aires, Argentina

Jan. 10, 2013

Re: [Pharo-users] Rendering text to bitmap buffer then paintImage to a canvas

by Jesus NuÃ±ez

Take a look at Athenas, the package Athenas-Text may help. There are some tests in the same package so you can give it a try. (It may not work on pharo 1.4 since the Athenas version is outdated and the tests may fail, however make them work should be straightforward) Regards, Jesus 2013/1/10 Ben Coman <btc(a)openinworld.com> > the text to a bitmap buffer then painting that onto a canvas. How might > that be achieved? And from Workspace can I test this? I have been > searching for a couple of hours already so thought I'd just ask. >

Jan. 10, 2013

Re: [Pharo-users] How do I save contents of Workspace into a collection?

by Paul DeBruicker

So I'm an idiot. The answer to question 1 could be: workSpaces:= TextMorphForEditView allInstances select: [ :morph | (morph firstOwnerSuchThat: [ :owner | (owner isKindOf: SystemWindow) and: [ owner model isKindOf: Workspace ] ]) notNil ] thenCollect:[:each | each]. workSpaces or: workSpaces:=OrderedCollection new. TextMorphForEditView allInstances do: [ :morph | (morph firstOwnerSuchThat: [ :owner | (owner isKindOf: SystemWindow) and: [ owner model isKindOf: Workspace ] ]) notNil ifTrue:[workSpaces add: morph] ]. But the answer I gave to it earlier is definitely wrong as you just end up with a an array full of trues and falses. Sorry for leading you down the wrong path Paul On 01/10/2013 09:29 AM, Paul DeBruicker wrote: > On 01/10/2013 07:32 AM, Frank Church wrote: >> >> >> >> Thanks for the last answer which lists all the workspaces. >> >> My initial desire was to label my Workspaces and then copy the contents >> of those which match some label and organize them into a kind of >> collection. Similar to ScriptManager. >> >> So essentially I want to list all Workspaces whose titles or contents >> match a substring, parse the contents further for some criteria and put >> those matching into a list for review. Then from there put the right >> ones into a permanent persisted collection. >> >> My intention is to do something like. >> >> | workSpaces textMorphs | >> workSpaces := OrderedCollection new. >> textMorphs := TextMorphForEditView allInstances >> select: [ :morph | (morph firstOwnerSuchThat: [ :owner | >> (owner >> isKindOf: SystemWindow) and: [ owner model isKindOf: Workspace ] ]) notNil ] >> >> I want to capture all the matching Workspaces into the workSpaces >> variable, by some method such as 'workSpaces[i] := textMorphs[i] >> getWorkspace' and get the labelString of the Workspace, but it seems >> that firstOwnerSuchThat returns a nil or notNil, rather than the actual >> Workspace and it also seems redundant to get the list of Workspaces into >> the workSpaces through iterating over the textMorphs variable as the >> owner variable in the loop captures them at some point. >> >> So this question breaks down into 2 parts. >> >> 1. How can copy add the owner if it turns out to be a Workspace to the >> workSpaces variable inside the loop (what is syntax) >> >> 2. How would I write a method such as : workSpace := textMorph >> getWorkspace, with or without using firstOwnerSuchThat, ie a general >> method of parsing the inheritance/ownership chain. > > > I recommend you read through this: > > http://squeak.joyful.com/LanguageNotes > > > 1. > > workSpaces:= > > TextMorphForEditView allInstances > collect: [ :morph | (morph firstOwnerSuchThat: [ :owner > | (owner > isKindOf: SystemWindow) and: [ owner model isKindOf: Workspace ] ]) notNil ] > > > 2. > > TextMorph>>getWorkspace > |workspace| > workspace:= self firstOwnerSuchThat: [ :owner | (owner > isKindOf: SystemWindow) and: [ owner model isKindOf: Workspace ] ]. > ^workspace > > > > Heres some for you: > > Why are you so resistant to using classes and so interested in using > workspaces? Why invent a new way of using Smalltalk when you don't have > the basics down pat? My point is you didn't know about #select: and you > didn't know about #collect: but you do know that Workspaces are > interesting and Classes and the Browser is not. Why not just put the > contents of whatever you've got in the Workspaces into methods in a > Classes you define and the you can call them whenever you want and > persist them with the tools that have been developed thus far rather > than inventing your own tooling while learning about Smalltalk..... > > > Good luck > > Paul >

Jan. 10, 2013

Re: [Pharo-users] How do I save contents of Workspace into a collection?

by Paul DeBruicker

On 01/10/2013 07:32 AM, Frank Church wrote: > > > > Thanks for the last answer which lists all the workspaces. > > My initial desire was to label my Workspaces and then copy the contents > of those which match some label and organize them into a kind of > collection. Similar to ScriptManager. > > So essentially I want to list all Workspaces whose titles or contents > match a substring, parse the contents further for some criteria and put > those matching into a list for review. Then from there put the right > ones into a permanent persisted collection. > > My intention is to do something like. > > | workSpaces textMorphs | > workSpaces := OrderedCollection new. > textMorphs := TextMorphForEditView allInstances > select: [ :morph | (morph firstOwnerSuchThat: [ :owner | > (owner > isKindOf: SystemWindow) and: [ owner model isKindOf: Workspace ] ]) notNil ] > > I want to capture all the matching Workspaces into the workSpaces > variable, by some method such as 'workSpaces[i] := textMorphs[i] > getWorkspace' and get the labelString of the Workspace, but it seems > that firstOwnerSuchThat returns a nil or notNil, rather than the actual > Workspace and it also seems redundant to get the list of Workspaces into > the workSpaces through iterating over the textMorphs variable as the > owner variable in the loop captures them at some point. > > So this question breaks down into 2 parts. > > 1. How can copy add the owner if it turns out to be a Workspace to the > workSpaces variable inside the loop (what is syntax) > > 2. How would I write a method such as : workSpace := textMorph > getWorkspace, with or without using firstOwnerSuchThat, ie a general > method of parsing the inheritance/ownership chain. I recommend you read through this: http://squeak.joyful.com/LanguageNotes 1. workSpaces:= TextMorphForEditView allInstances collect: [ :morph | (morph firstOwnerSuchThat: [ :owner | (owner isKindOf: SystemWindow) and: [ owner model isKindOf: Workspace ] ]) notNil ] 2. TextMorph>>getWorkspace |workspace| workspace:= self firstOwnerSuchThat: [ :owner | (owner isKindOf: SystemWindow) and: [ owner model isKindOf: Workspace ] ]. ^workspace Heres some for you: Why are you so resistant to using classes and so interested in using workspaces? Why invent a new way of using Smalltalk when you don't have the basics down pat? My point is you didn't know about #select: and you didn't know about #collect: but you do know that Workspaces are interesting and Classes and the Browser is not. Why not just put the contents of whatever you've got in the Workspaces into methods in a Classes you define and the you can call them whenever you want and persist them with the tools that have been developed thus far rather than inventing your own tooling while learning about Smalltalk..... Good luck Paul

Jan. 10, 2013

Re: [Pharo-users] [squeak-dev] How can the main window title in Squeak and Pharo be set?

by Bert Freudenberg

On 10.01.2013, at 08:40, Frank Church <vfclists(a)gmail.com> wrote: > How can the main window title in Squeak and Pharo be set? > > In Pharo I thought it could be set in the System -> Settings Menu but > couldn't find anything there. > > Can it be set only in code? Try this in Squeak: HostWindowProxy basicNew primitiveWindowTitle: 1 string: 'My Title' squeakToUtf8 In Etoys we have a convenience method for this: DisplayScreen hostWindowTitle: 'My Title' (because Etoys shows the current project name as window title) - Bert -

Jan. 10, 2013

Re: [Pharo-users] How can the main window title in Squeak and Pharo be set?

by Esteban Lorenzano

DisplayScreen hostWindowTitle: 'My Title'. On Jan 10, 2013, at 5:40 PM, Frank Church <vfclists(a)gmail.com> wrote: > How can the main window title in Squeak and Pharo be set? > > In Pharo I thought it could be set in the System -> Settings Menu but > couldn't find anything there. > > Can it be set only in code? > > > -- > Frank Church > > ======================= > http://devblog.brahmancreations.com >

Jan. 10, 2013

How can the main window title in Squeak and Pharo be set?

by Frank Church

How can the main window title in Squeak and Pharo be set? In Pharo I thought it could be set in the System -> Settings Menu but couldn't find anything there. Can it be set only in code? -- Frank Church ======================= http://devblog.brahmancreations.com

Jan. 10, 2013

Re: [Pharo-users] How do I save contents of Workspace into a collection?

by Frank Church

On 9 January 2013 21:08, Paul DeBruicker <pdebruic(a)gmail.com> wrote: > On 01/09/2013 12:39 PM, Frank Church wrote: > > > > On 9 January 2013 19:30, Paul DeBruicker <pdebruic(a)gmail.com > > <mailto:pdebruic@gmail.com>> wrote: > > > > On 01/09/2013 11:18 AM, Frank Church wrote: > > > > > > When I print it returns an empty array #(), but I expect to get > subset > > > of TextMorphForEditView allInstances. > > > > > > What is the likely purpose of the notNil? > > > > > > -- > > > Frank Church > > > > > > The #firstOwnerSuchThat: method either returns the morph that meets > the > > criteria specified in the block sent to it (in this instance that the > > owner is a SystemWindow and its model is a Workspace) or nil. The > > #select: block needs the code inside it to return a boolean, so the > > #notNil converts the response from the #firstOwnerSuchThat: method > into > > a boolean rather than leaving it as either nil or the morph. > > > > > > If you right click on a method and choose Implementors you can see > how > > each class that implements the method defines it. You can also right > > click the method and choose Senders to see examples of how the > method is > > used. > > > > > > Is there some reason why the expression is returning an empty > collection? > > > > Isn't the select: meant to return the whole list? > > > No the #select: returns only those elements for which the select block > returns true. The reason why you're getting an empty collection is > because the select block for every element returns false. The criteria > in the #firstOwnerSuchThat: block needs to be adjusted to be more > permissive. Or the starting collection is wrong. > > In this instance its an issue of the criteria in the > #firstOwnerSuchThat: block being wrong. > > This one you want is this: > > TextMorphForEditView allInstances > select: [ :morph | (morph firstOwnerSuchThat: [ :owner | > (owner > isKindOf: SystemWindow) and: [ owner model isKindOf: Workspace ] ]) notNil > ] > > (I changed 'owner class isKindOf: SystemWindow' to 'owner isKindOf: > SystemWindow') > > > I'm on linux and you can shift-click (it may be option-click or > commanc-click on other platforms I have no idea) the title bar of a > Workspace and click 'explore' to see that workspace's instance > variables. In the bottom pane of the explorer window you can test your > select block's criteria to ensure it works for your desired objects. > > > > > Another way to find a workspace is first close all windows then open a > workspace and run > > Smalltalk garbageCollect > > > then highlight the following, right click it, and choose 'explore' > > > TextMorphForEditView allInstances > > The only thing in the array in the explorer window is the morph for the > workspace. You can then start looking through the owners by clicking > the triangle next to the #owner instance variable until you find one > who's model is 'a Workspace'. That's the workspace object. > > > > > > > Thanks for the last answer which lists all the workspaces. My initial desire was to label my Workspaces and then copy the contents of those which match some label and organize them into a kind of collection. Similar to ScriptManager. So essentially I want to list all Workspaces whose titles or contents match a substring, parse the contents further for some criteria and put those matching into a list for review. Then from there put the right ones into a permanent persisted collection. My intention is to do something like. | workSpaces textMorphs | workSpaces := OrderedCollection new. textMorphs := TextMorphForEditView allInstances select: [ :morph | (morph firstOwnerSuchThat: [ :owner | (owner isKindOf: SystemWindow) and: [ owner model isKindOf: Workspace ] ]) notNil ] I want to capture all the matching Workspaces into the workSpaces variable, by some method such as 'workSpaces[i] := textMorphs[i] getWorkspace' and get the labelString of the Workspace, but it seems that firstOwnerSuchThat returns a nil or notNil, rather than the actual Workspace and it also seems redundant to get the list of Workspaces into the workSpaces through iterating over the textMorphs variable as the owner variable in the loop captures them at some point. So this question breaks down into 2 parts. 1. How can copy add the owner if it turns out to be a Workspace to the workSpaces variable inside the loop (what is syntax) 2. How would I write a method such as : workSpace := textMorph getWorkspace, with or without using firstOwnerSuchThat, ie a general method of parsing the inheritance/ownership chain. -- Frank Church ======================= http://devblog.brahmancreations.com

Jan. 10, 2013

Rendering text to bitmap buffer then paintImage to a canvas

by Ben Coman

I need to improve the performance of a lot of text that drawn on screen while the screen is being dragged around and would like to experiment with rendering the text to a bitmap buffer then painting that onto a canvas. How might that be achieved? And from Workspace can I test this? I have been searching for a couple of hours already so thought I'd just ask. cheers -ben

Jan. 10, 2013