I could use another design pattern, but I need to figure out which one
then. The application is one where the user can selected certain items
and those items are put on a canvas. Then when the user selects the item
on the canvas, a panel shows up that allows the item to be rotated,
scaled and possible edited ,i.e add text. I thought that the decorator
would be perfect for this.
Come to think of it maybe it still is. I really dont ever need to remove
any decorator that is added do I.
Them item starts blank and when the user rotates it, I just add a
decorator, rotatorModifier. Then the decorator interface has a method
setModifierProperty(key , value), in this case key = "rot" value=number.
The decorator component holds a hash and checks if
hash["rot"]!=undefined, then adds the rot and the value. Then calls an
update method to reflect the property set.
Deleting the modifier would be then just setting the hash["rot"] to 0.
Does that make sense and I am approaching this in a efficient way. I am
quit new to design patterns, but fell in love with there elegance and
would like to learn how to implement them as best as possible. Some
feedback would be very much appreciated.
Jiri
Cory Petosky wrote:
That's not really how Decorator is meant to work.
You could hack around it by exposing the decorated instance in your
Decorator interface, digging down to it, and using a bunch of
instanceof calls to figure out which is which. I really don't
recommend this, though -- instead, use a different design pattern or
program architecture.
On 3/20/08, Jiri Heitlager <[EMAIL PROTECTED]> wrote:
Hello List,
i am looking into the decorator pattern for an upcoming AS2 project. I was
wondering if the following is possible
var com:Component = new Component()
com = new decoratorA(com)
com = new decoratorB(decA)
com = new decoratorC(decB)
I cant seem to figure out what I need to do in order to remove let say
decB at runtime? I tried a search on the internet, but all the articles
about the decorator pattern are about runtime adding, not removing.
Can somebody please help me if it is at all possible.
Thank you,
Jiri
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