Beginners May 2007

beginners@lists.squeakfoundation.org

52 participants
48 discussions

Tracing back objects
by subbukk 25 May '07

25 May '07

Hi, The following code: CompiledMethod allInstances inject: (CompiledMethod allInstances first) into: [:m :i | i size > m size ifTrue: [i] ifFalse: [m]]. gives the largest method as an object. Is there an efficient way to trace back the method selector and its class without doing a brute force lookup? TIA .. Subbu

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Re: undefinedobject showflag
by Jerome Peace 25 May '07

25 May '07

[Newbies] undefinedobject showflag Hi Mike, Thanks for the picture. nil is the one and only instance of Undefined object. The error message says that nil does not understand (has no method for) the message "showflap". The question is why is aViewer owner ifNotNilDo: [ :f | ^f flapTab showFlap; yourself ]. trying to send #showFlap to nil. PasteUpMoprh>>flapTab | ww | self isFlap ifFalse:[^nil]. ww _ self world ifNil: [World]. ^ww flapTabs detect:[:any| any referent == self] ifNone:[nil] is returning nil so either "aViewer owner" is not a flap or none of the worlds flapTabs are this one. If you explore how to use the debugger you can actually look to see which is the case. Without knowing how to recreate the problem I couldn't say from the outside. (First rule of troubleshooting is first hand information.) ;-) However, one suggestion would be just abandon the debug window. And then see if anything vital is actually missing. And maybe next time when saving a project, dismiss the viewer flaps from the screen before saving. hth, Yours in curiosity and service, --Jerome Peace *** >mstram mstramba at sympatico.ca >Thu May 24 21:41:47 UTC 2007 wrote: > >I keep getting this message 'undefinedobject showflag', when working with the >viewer for graphically objects and when saving the image. This happens with >Squeak 3.9 /7067. > >Here's a screengrab (couldn't figure out how to capture the text contents) > >http://mstram.freepgs.com/img/undefinedobject_showflag.jpg > >Mike >-- *** ____________________________________________________________________________________Get the free Yahoo! toolbar and rest assured with the added security of spyware protection. http://new.toolbar.yahoo.com/toolbar/features/norton/index.php

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undefinedobject showflag
by mstram 24 May '07

24 May '07

I keep getting this message 'undefinedobject showflag', when working with the viewer for graphically objects and when saving the image. This happens with Squeak 3.9 /7067. Here's a screengrab (couldn't figure out how to capture the text contents) http://mstram.freepgs.com/img/undefinedobject_showflag.jpg Mike -- View this message in context: http://www.nabble.com/undefinedobject-showflag-tf3812973.html#a10793308 Sent from the Squeak - Beginners mailing list archive at Nabble.com.

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shortcut to search all categories for a particular class?
by Giles Bowkett 24 May '07

24 May '07

Hi all - is there an easy way to google Smalltalk, so to speak? If I know the class name but not its location in the System Browser, is there an easy shortcut which will take me directly to the code for the class? -- Giles Bowkett Blog: http://gilesbowkett.blogspot.com Portfolio: http://www.gilesgoatboy.org

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Re: Some general questions
by Darren White 23 May '07

23 May '07

Hello, Thanks fro the replies. I think my first question was a little fuzzy. I think what I need to do as change the question. If for example I have a seaside web app and users need to create an account. Now, for each user I create an object, say an instance of class Users, which has instance variables such as name and address. So the new user puts in their detail such as name, address, telephone number and then click register. How should (not what) the system name this object. What I'm confused about is I don't know how may users the system will have have do I name all the user object; I can't call them all aUser . If the first user gets an object named user1 how do I create another instance of User named user2 or What about If I want to use one of the input field as part of the name of the object? The example below may make it clear what I mean 10 timesRepeat: [ x := 1 asString. ''the value of x can be any string object" user"how do I add x to be part off the name so I end up with variable named user1 user2 ... " := User new. x := x + x.] Darren

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Some general questions
by Darren White 23 May '07

23 May '07

Hello Is there a way to use a string as the name for a object? For example if I have the input string 'fred' from a user input field how do I create a object named userFred or even just fred? What is the difference between the source file and the image? Does the image use the code from the source file? If I create code dose it live in the image or source file? Is there a way to trigger a save prompt when clicking on the window close button? And a question about posting to this list: I notice that the replies to my last post didn't have 'Re' prefixed to them. How do I reply to a thread. For my lat post it seems that I accidentally relayed to the thread I had started by starting a new thread -oops. Darren

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User interfaces | getting started
by Darren White 22 May '07

22 May '07

Hi all, Thank for all the replies, they have been incredibility helpful and interesting :-). I have had a lot to play with and read, I feel things becoming a little clearer. I'm having lots of wow moments. I see Morphic isn't so daunting when it's seen as lots of Morphs holding other Morphs. I like the suggestion of deconstructing stuff and looking at the parts and putting it all back together. I used to do this as a kid with my toys. As for creating new 'programs' it seems to be a good idea to build the modal then put a front end to it later or not even. I've been dabbling with seaside too - OMG how fantastic! Thanks again, Darren

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User interfaces | getting started
by Darren White 22 May '07

22 May '07

Hello, This is my first post here. I have been exploring the squeak environment and smalltalk syntax for a few weeks now. Usually when learning a new programming language I create a small programs such as a contacts list. First I may do it with a console front end then play around with a GUI and widgets. I have got to the stage with squeak where I want to do that but I can't see how to proceed. For a console type program how do I proceed and for a GUI program what is the main form/frame/window to hold the components. So the main thing I'm stuck with is the user interface, I have read enough to know how to create classes and their method bodies (though my code may be bad at this stage :-) ). Any advice would be most welcome, I can't wait to get stuck in! Darren

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Re: Morph Drop Shadows
by Jerome Peace 21 May '07

21 May '07

[Newbies] Morph Drop Shadows HI David H. Shanabrook, As Bert says the trick is to move the morph w/o lifting it. One general way to do that with any morph is the brown halo handle. The other is to create a morph that behaves the way you want. I had started some work which I had hope to apply to moving block puzzles. I wrote a little about it Here: http://lists.squeakfoundation.org/pipermail/squeak-dev/2007-May/116371.html And posted my work in progress code to bob's super swiki http://209.143.91.36/super/728 MovingPiece-wiz The codes in the form of a 3dot9 project. Load the project and look at the change set for it. Also earlier related work on puzzleboards modified a pasteup morph to prevent overlapping pieces: http://209.143.91.36/super/634 Puzzleboards The code is in both project form (for an old 3.7 squeak) and as change sets. The change set should work in 3.9 and probably a recent 3.8 (if they fixed the bug mentioned) You will need to adapt it to apply to pentomino's Hth. Yours in curiosity and service, --Jerome Peace *** >[Newbies] Morph Drop Shadows > > >Bert Freudenberg bert at freudenbergs.de >Sun May 20 19:05:01 UTC 2007 > > >In that case it's surely simplest to add the mouse handling to your >pentomino tiles. > >- Bert - > >On May 20, 2007, at 21:01 , David H. Shanabrook wrote: > >> I am experimenting with geometry tutors, such as pentominos. when >> trying to fit shapes precisely together the shadow is very >> disturbing, it is hard to know what is the shadow and what is the >> shape, especially for kids. >> >> dhs >> >> >> On 20 May 2007, at 14:51, Bert Freudenberg wrote: >> >>> The Hand draws a shadow of all morphs it is holding. You could >>> implement the dragging of your morphs yourself and not leave that >>> to HandMorph. Or hack HandMorph>>fullDrawOn: method to not draw >>> the shadow (possibly in a subclass). >>> >>> May I ask what you need this for? >>> >>> - Bert - >>> >>> On May 20, 2007, at 19:38 , David H. Shanabrook wrote: >>> >>>> Subbu >>>> >>>> It is the temporary shadow that appears when I pick the morph >>>> that I want to eliminate. I am using 3.9 although I can switch >>>> to an older version if it would help. >>>> >>>> dhs >>>> >>>> On 20 May 2007, at 13:23, subbukk wrote: >>>> >>>>> On Sunday 20 May 2007 10:07 pm, David H. Shanabrook wrote: >>>>>> Can I change the pick up a morph so that it doesn't have a >>>>>> shadow? I >>>>>> tried in the morph menu to drop shadow: show shadow, but this >>>>>> doesn't >>>>>> work. It doesn't affect the morph whether the show shadow is >>>>>> checked or not. >>>>> Which version is your image? For drop shadow to be visible, make >>>>> sure the drop >>>>> shadow color is different from the background and the offset is >>>>> non-zero. >>>>> >>>>> The drop shadow (in halo menu) is different from the temporary >>>>> shadow that >>>>> appears when you 'pick' the morph. >>>>> >>>>> Regards .. Subbu >>> *** ____________________________________________________________________________________ Never miss an email again! Yahoo! Toolbar alerts you the instant new Mail arrives. http://tools.search.yahoo.com/toolbar/features/mail/

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Re: Morph Drop Shadows
by David H. Shanabrook 21 May '07

21 May '07

> On May 20, 2007, at 3:01 PM, David H. Shanabrook wrote: > >> I am experimenting with geometry tutors, such as pentominos. when >> trying to fit shapes precisely together the shadow is very >> disturbing, it is hard to know what is the shadow and what is the >> shape, especially for kids. > > When I want to remove the drag-shadow from Morphs, I often use > something like the following methods (implemented on my Morph > subclass): > ... > Of course I'm sure there must be some flag that does the same > thing! ;) If I am writing a system with many Morphs like this, I of > course put all of this code in a superclass to avoid clutter. > > Hope this helps, > Benjamin Schroeder > > > > > > > You could take the same tack in Squeak. For instance, open a > Workspace and > drill down using halos till you get to the smallest part. Drag it to a > different place. Repeat for all the parts. Then 'inspect/explore/ > browse' each > part to see how it was put together. You could also try tracing code > execution using "debug it" to pick up programming idioms. Use > 'explain' to > find out more about new words/terms. Debug through ClickExerciser > object to > see how it handles mouse clicks. > > Enjoy .. Subbu > I found if I just change the value of HandMorph dropShadows shadowOffset from 6@8 to 0@0 this eliminates the drop shadows. For morphs with opacity less than 1.0 the morph turns opaque when clicked on; which helps with noticing the object is picked. Would this be a variable which could be set in Preferences? I think others must also find drop shadows make positioning morphs difficult in some circumstances. Thanks dhs

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Beginners May 2007