Hi,
below is the 'concrete' version;
class JuiceMaster
{
public function makeJuice(type:String):void
{
trace("Happily making", type, "juice!", "Tralalala!");
}
}
public class JuiceMaker
extends Button
{
private var _makerClass:Class;
private var makerImpl:JuiceMaster;
public function set makerClass(value:Class):void
{
_makerClass = value;
makerImpl = new _makerClass();
}
public function set makerClass():Class
{
return makerImpl;
}
public function JuiceMaker()
{
super();
// you could just make the default implementation here
// thats about as concrete as it gets
makerImpl = new JuiceMaker();
}
public function makeJuice(type:String):void
{
if (makerImpl is JuiceMaster)
makerImpl.makeJuice(type);
}
}
Notice the types are concrete meaning you are programming to an implemented
class, no polymorphism here.
And note this is not 'real' decoration either.
Real decoration means you pass a reference to an instance of the decorator
and actually call the decorators methods.
This is like Composition Decorating, and maybe there is some other OO word
for it. I don't care about the technical of it just that it IS a pattern
good for DisplayObjects.
Peace, Mike
On 9/12/07, Claudia Barnal <[EMAIL PROTECTED]> wrote:
>
> Yeah, I had thought about something using composition. But somewhere I
> had read that the Decorator was what I needed :(
>
> I'll do it as you mentioned, but I would still love to hear about the
> Concrete class that you mention :)
>
> Thanks Michael!
>
> On 9/12/07, Michael Schmalle <[EMAIL PROTECTED]> wrote:
>
> > Oh yeah
> >
> > <JuiceMaker id="myJuiceMaker" decorator="{JuiceMaster}" click="
> > myJuiceMaker.makeJuice('orange')" />
> >
> > is supposed to be;
> >
> > <JuiceMaker id="myJuiceMaker" makerClass="{JuiceMaster}" click="
> > myJuiceMaker.makeJuice('orange')" />
> >
> >
> > On 9/12/07, Michael Schmalle <[EMAIL PROTECTED]> wrote:
> >
> > > Hi,
> > >
> > > You can't decorate a UIComponent since it is a DisplayObject and needs
> > > to be added to the display list.
> > >
> > > You have to either us composition or subclass Button and use an
> > > interface and pass the class to decorate the Button with.
> > >
> > > <JuiceMaker id="myJuiceMaker" decorator="{JuiceMaster}" click="
> > > myJuiceMaker.makeJuice('orange')" />
> > >
> > >
> > > class JuiceMaster
> > > implemented IJuiceMaker
> > > {
> > > public function makeJuice(type:String):void
> > > {
> > > trace("Happily making", type, "juice!", "Tralalala!");
> > > }
> > > }
> > >
> > > public class JuiceMaker
> > > extends Button
> > > implemented IJuiceMaker
> > > {
> > >
> > > private var _makerClass:Class;
> > > private var makerImpl:IJuiceMaster;
> > >
> > > public function set makerClass(value:Class):void
> > > {
> > > _makerClass = value;
> > > makerImpl = new _makerClass();
> > > }
> > >
> > > public function set makerClass():Class
> > > {
> > > return makerImpl;
> > > }
> > >
> > > public function JuiceMaker()
> > > {
> > > super();
> > > }
> > >
> > > public function makeJuice(type:String):void
> > > {
> > > if (makerImpl is IJuiceMaker)
> > > makerImpl.makeJuice(type);
> > > }
> > > }
> > >
> > >
> > > public interface IJuiceMaker
> > > {
> > > function makeJuice(type:String):void;
> > > }
> > >
> > >
> > > The above is something that would help what you are trying to achieve
> > > with display object.
> > >
> > > You could also drop the interfaces and use concrete types but hey, if
> > > your asking about decorators, your asking about design patterns. ;-)
> > >
> > > Peace, Mike
> > >
> > > On 9/12/07, Claudia Barnal < [EMAIL PROTECTED]> wrote:
> > > >
> > > > I believe I might be missing something with the Decorator Pattern.
> > > > I've tried to get a simple example to work, but I get too mixed up
> > > > with all the abstracts and what not.
> > > >
> > > > Here's what I'm trying to do:
> > > >
> > > > Extend a Button and add some functionality to it gotten from another
> > > > class (non visual). From what I can understand, this is what the
> > > > Decorator Pattern is for.
> > > >
> > > > In pseudo code this is the basic functionality I want:
> > > >
> > > > class JuiceMaster
> > > > {
> > > > public function makeJuice(type:String):void
> > > > {
> > > > trace("Happily making", type, "juice!", "Tralalala!");
> > > > }
> > > > }
> > > >
> > > > class JuiceMaker extends Button
> > > > {
> > > > public function JuiceMaker()
> > > > {
> > > > Super();
> > > > makeJuice("apple");
> > > > }
> > > > }
> > > >
> > > > And in MXML, I should be able to do something like this:
> > > >
> > > > <JuiceMaker id="myJuiceMaker" click="myJuiceMaker.makeJuice('orange')"
> > > > />
> > > >
> > > > Of course this example isn't going into any detail, and doesn't make
> > > > much sense, but this is somewhat my need.
> > > >
> > > > Any explicit explanation on how to get something like this to work
> > > > with the Decorator Pattern is greatly appreciated.
> > > >
> > > > Thanks!
> > > >
> > >
> > >
> > >
> > > --
> > > Teoti Graphix
> > > http://www.teotigraphix.com
> > >
> > > Blog - Flex2Components
> > > http://www.flex2components.com
> > >
> > > You can find more by solving the problem then by 'asking the
> > > question'.
> >
> >
> >
> >
> > --
> > Teoti Graphix
> > http://www.teotigraphix.com
> >
> > Blog - Flex2Components
> > http://www.flex2components.com
> >
> > You can find more by solving the problem then by 'asking the question'.
> >
> >
>
>
--
Teoti Graphix
http://www.teotigraphix.com
Blog - Flex2Components
http://www.flex2components.com
You can find more by solving the problem then by 'asking the question'.
