Hi all,
I have a design Problem.
i have a Drawer class wich invokes a serie of methods of a kind-of-brush class and i have a predefined shapes which i want to draw. Each shape uses a list of instance methods from the drawer. I can have more than 1 brush object.
I want to add custom shapes on runtime in the drawer instance, especifying the list of methods of the new shape.
i've created a class method for every predefined shape that returns a BlockClosure with the instruccions. Obviously i have to give to each BlockClosure the brush object as parameter. I imagine a collection with all the BlockClosures in each instance of the Drawer Class.
Maybe i can inherit a SequenceableCollection and make a instruccion collection. Each element of the collection it's a instruction and i give the brush object when i instance this new collection.
I really don't know the best way to store these steps.
(Maybe a shared variable?)
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106answers:
2Maybe you can use anActionSequence with some MessageSend instances and put them in aDictionary in your Drawer (I'd prefer "Painter" as a Classname for that CLass, since "Drawer" sounds much like the furniture part in my ears :)
I'm not realy sure what you want to achieve exactly.
Bongiorno, Luciano! La domanda di Lei non è troppo chiara. Eh... I'd rather use English, my Italian is somewhat poor.
Your question is not very clear. It could help if I knew more of the context of your problem. What kind of software are you developing? Why do you need many instances of the 'Drawer' (or Painter) class?
Based on what I was able to guess now, I'd suppose you need some variant of Interpreter pattern. The "Gang of Four" book (Design Patterns: Elements of Reusable Object-Oriented Software) is a must-read for each and every programmer. For Smalltalkers I highly recommend "The Design Patterns Smalltalk Companion" by Sherman Alpert, Kyle Brown and Bobby Woolf as an everyday reference.
Sorry, this is all advice I can give regarding your problem as it is currently formulated.