Thanks Ben. It was very helpful. Azka
> Date: Thu, 3 Oct 2013 16:54:06 +0800 > From: [email protected] > To: [email protected] > Subject: Re: [Newbies] Dismissing an object > > > Hi Azka, > > Maybe this helps: http://wiki.squeak.org/squeak/1584 > > Azka Niazi wrote: > > When we create an instance of a class with the new method, it does not show > > up in the world unless we use the openInWorld method. > > > The 'World' Morphic UI interface is only a part of the system. There > are many more classes dealing with non-UI facilities like file access, > file access, process scheduling and collections. Should > "OrderedCollection new" somehow appear on the screen ? > The #new method deals with the generic activity of creating new > instances only, not the additional function of asking a morph to display > itself in the World. > > > > To make it disappear we tried dismiss me option from the halo menu. > > By saying "tried" you imply this action failed. What gives you this > impression? > > > Does the dismissed object remain created somewhere in the background or > > does it get completely deleted from the system. > It depends on if anything besides the 'World' references the object. In > particular, if you store the instance in a variable in Workspace, that > will prevent it from being garbage collected. For example, copy the > following to a Workspace the evaluate each line one at a time. > > Smalltalk garbageCollect. EllipseMorph allInstances inspect. > "Observe no instances" > x := EllipseMorph new. "Creates a new instance" > EllipseMorph allInstances inspect. "Observe one instance" > x openInWorld. "Displays the instance" > "Close the morph using the halos" > Smalltalk garbageCollect. EllipseMorph allInstances inspect. > "Observe instance remains" > x openInWorld. "Re-displays same instance" > "Close the morph using the halos" > x := nil. > Smalltalk garbageCollect. EllipseMorph allInstances inspect. "Observe > no instances" > > > > Also, we have to ask, does evaluating (meaning repeatedly using the do it > > option) for the code which looks like this:className newCreate multiple > > objects of the same class in the background, or does it override the > > previously created object? > > Azka > > Multiple evaluations of "SomeClassName new" creates multiple independent > instances of that class. > > cheers -ben > > _______________________________________________ > Beginners mailing list > [email protected] > http://lists.squeakfoundation.org/mailman/listinfo/beginners
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