Re: [Flashcoders] how to not overwrite methods, but append functionality
Hello,
some time ago i postet at flashforum.de how this can be done, without
drawbacks to the rest of the application:
http://www.flashforum.de/forum/showthread.php?t=207998
Its in german but the code is more or less internation :)
Janosch
Matthias Dittgen schrieb:
Hello list,
my tooltip class uses code like this "mc.onRollOver = function() {}"
to add its tooltip functionality to a movieclip mc. But this way it
overwrites the onRollOver method of mc and disables the functionality
like highlighting.
So now my question (probably a really simple one): How is it possible
to append functionality instead of overwriting? is there something
like "super()" is for cunstructors?
Thanks,
Matthias
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Re: [Flashcoders] how to not overwrite methods, but append functionality
I agree with Julien - EventDispatcher is ideal for this purpose. It's
one of the reasons it exists - to allow more than one object to be
notified when an event occurs.
Ian
On 8/11/06, julien castelain <[EMAIL PROTECTED]> wrote:
hi,
maybe using mx.events.EventDispatcher could help
i'm probably wrong, but have you tried ?
class A {
function onRollOver() {
doTheRollOver();
dispatchEvent({type:"onRollOver", target:this});
}
function doTheRollOver() {
// do somtehing here
}
}
class B {
function B() {
var a:A = new A();
a.addEventListener("onRollOver", Delegate.create(this, onRollOver));
}
function onRollOver(e:Object) : Void {
// do something else here
}
}
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Re: [Flashcoders] how to not overwrite methods, but append functionality
whoooaaa! Thank to all who answered!!! I have to read through your answers and some testing before I can make further comments. Matthias ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
Re: [Flashcoders] how to not overwrite methods, but append functionality
hi,
maybe using mx.events.EventDispatcher could help
i'm probably wrong, but have you tried ?
class A {
function onRollOver() {
doTheRollOver();
dispatchEvent({type:"onRollOver", target:this});
}
function doTheRollOver() {
// do somtehing here
}
}
class B {
function B() {
var a:A = new A();
a.addEventListener("onRollOver", Delegate.create(this, onRollOver));
}
function onRollOver(e:Object) : Void {
// do something else here
}
}
On 8/11/06, Johannes Nel <[EMAIL PROTECTED]> wrote:
var f:Function = mc.onRollOver
mx.onRollOver = function ()
{
f();
}
you might want to look at function.apply to get it too call in the right
context.
On 8/11/06, Matthias Dittgen <[EMAIL PROTECTED]> wrote:
>
> but it doesn't work for me, because I don't want to get onRollOver
> from the superclass ( I don't do an extend). I just want to add some
> functionality to the onRollOver of the same instance of a movieclip.
>
> it's like that:
>
> var mc:MovieClip = this.attachMovie(MyClipClass.SymbolName,"mc",
> this.getNextHighestDepth());
>
> var tooltip:MyTooltipClass = new MyTooltipClass(mc, "tooltiptext");
>
>
> in MyClipClass, there is a public function onRollOver() {}, which
> works well, as long as I don't apply MyTooltipClass.
>
> in MyTooltipClass, there I call mc.onRollOver = function() {}, which
> overwrites the former onRollOver. But I just want to add something to
> the existing onRollOver.
>
> Someone?
>
>
> 2006/8/11, Martin Wood <[EMAIL PROTECTED]>:
> >
> >
> > Matthias Dittgen wrote:
> > > Hello list,
> > >
> > > my tooltip class uses code like this "mc.onRollOver = function() {}"
> > > to add its tooltip functionality to a movieclip mc. But this way it
> > > overwrites the onRollOver method of mc and disables the functionality
> > > like highlighting.
> > >
> > > So now my question (probably a really simple one): How is it possible
> > > to append functionality instead of overwriting? is there something
> > > like "super()" is for cunstructors?
> >
> > exactly.
> >
> > super.onRollOver()
> >
> > will call the method in the superclass.
> >
> > martin
> >
> > ___
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> > To change your subscription options or search the archive:
> > http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
> >
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Re: [Flashcoders] how to not overwrite methods, but append functionality
On 8/11/06, Matthias Dittgen <[EMAIL PROTECTED]> wrote:
but it doesn't work for me, because I don't want to get onRollOver
from the superclass ( I don't do an extend). I just want to add some
functionality to the onRollOver of the same instance of a movieclip.
You have two options (or more, but they are variations):
One is to do something like this:
var f = function () {
mc.showToolTip();
mc.call( mc, arguments.callee.oldRollOver );
};
f.oldRollOver = mc.onRollOver;
mc.onRollOver = f;
(Of course, you could also simply rename mc.onRollOver to
mc.oldRollOver and call that instead of doing the arguments.callee
thing.)
That's all nice as long as you only add new funtionality, but if you
want to remove one of the behaviours, you have a problem because it's
buried somewhere in the chain.
The alternative is to keep a table of onRollOvers:
mc.rollOvers = {};
mc.addRollOver = function ( id : String, behaviour : Function ) {
this.rollOvers[ id ] = behaviour;
};
mc.removeRollOver = function ( id : String ) {
delete this.rollOvers[ id ];
};
mc.onRollOver = function () {
for( var i in this.rollOvers ) {
this.rollOvers[ i ]();
}
};
Use it like this:
mc.addRollOver( "highlight", mc.doHighLight );
mc.addRollOver( "tooltip", mc.showToolTip );
Both could of course be done much nicer, but you get the idea.
HTH,
Mark
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Re: [Flashcoders] how to not overwrite methods, but append functionality
in MyTooltip you can re-assign the onRollOver to another name and call that from
the new onRollOver, like this :
in MyTooltip
mc.onRollOver2 = mc.onRollOver;
mc.onRollOver = function()
{
// some stuff here
// call the original
this.onRollOver2();
}
thats one way of doing it
martin
Matthias Dittgen wrote:
but it doesn't work for me, because I don't want to get onRollOver
from the superclass ( I don't do an extend). I just want to add some
functionality to the onRollOver of the same instance of a movieclip.
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Re: [Flashcoders] how to not overwrite methods, but append functionality
var f:Function = mc.onRollOver
mx.onRollOver = function ()
{
f();
}
you might want to look at function.apply to get it too call in the right
context.
On 8/11/06, Matthias Dittgen <[EMAIL PROTECTED]> wrote:
but it doesn't work for me, because I don't want to get onRollOver
from the superclass ( I don't do an extend). I just want to add some
functionality to the onRollOver of the same instance of a movieclip.
it's like that:
var mc:MovieClip = this.attachMovie(MyClipClass.SymbolName,"mc",
this.getNextHighestDepth());
var tooltip:MyTooltipClass = new MyTooltipClass(mc, "tooltiptext");
in MyClipClass, there is a public function onRollOver() {}, which
works well, as long as I don't apply MyTooltipClass.
in MyTooltipClass, there I call mc.onRollOver = function() {}, which
overwrites the former onRollOver. But I just want to add something to
the existing onRollOver.
Someone?
2006/8/11, Martin Wood <[EMAIL PROTECTED]>:
>
>
> Matthias Dittgen wrote:
> > Hello list,
> >
> > my tooltip class uses code like this "mc.onRollOver = function() {}"
> > to add its tooltip functionality to a movieclip mc. But this way it
> > overwrites the onRollOver method of mc and disables the functionality
> > like highlighting.
> >
> > So now my question (probably a really simple one): How is it possible
> > to append functionality instead of overwriting? is there something
> > like "super()" is for cunstructors?
>
> exactly.
>
> super.onRollOver()
>
> will call the method in the superclass.
>
> martin
>
> ___
> Flashcoders@chattyfig.figleaf.com
> To change your subscription options or search the archive:
> http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
>
> Brought to you by Fig Leaf Software
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Re: [Flashcoders] how to not overwrite methods, but append functionality
Do you mean you want to do something like...
var oldRollOver:Function = this.onRollOver;
this.onRollOver = function () {
trace("new onRollOver functionality");
oldRollOver(); //call pre-existing functionality
}
Matthias Dittgen wrote:
but it doesn't work for me, because I don't want to get onRollOver
from the superclass ( I don't do an extend). I just want to add some
functionality to the onRollOver of the same instance of a movieclip.
it's like that:
var mc:MovieClip = this.attachMovie(MyClipClass.SymbolName,"mc",
this.getNextHighestDepth());
var tooltip:MyTooltipClass = new MyTooltipClass(mc, "tooltiptext");
in MyClipClass, there is a public function onRollOver() {}, which
works well, as long as I don't apply MyTooltipClass.
in MyTooltipClass, there I call mc.onRollOver = function() {}, which
overwrites the former onRollOver. But I just want to add something to
the existing onRollOver.
Someone?
2006/8/11, Martin Wood <[EMAIL PROTECTED]>:
Matthias Dittgen wrote:
> Hello list,
>
> my tooltip class uses code like this "mc.onRollOver = function() {}"
> to add its tooltip functionality to a movieclip mc. But this way it
> overwrites the onRollOver method of mc and disables the functionality
> like highlighting.
>
> So now my question (probably a really simple one): How is it possible
> to append functionality instead of overwriting? is there something
> like "super()" is for cunstructors?
exactly.
super.onRollOver()
will call the method in the superclass.
martin
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Re: [Flashcoders] how to not overwrite methods, but append functionality
but it doesn't work for me, because I don't want to get onRollOver
from the superclass ( I don't do an extend). I just want to add some
functionality to the onRollOver of the same instance of a movieclip.
it's like that:
var mc:MovieClip = this.attachMovie(MyClipClass.SymbolName,"mc",
this.getNextHighestDepth());
var tooltip:MyTooltipClass = new MyTooltipClass(mc, "tooltiptext");
in MyClipClass, there is a public function onRollOver() {}, which
works well, as long as I don't apply MyTooltipClass.
in MyTooltipClass, there I call mc.onRollOver = function() {}, which
overwrites the former onRollOver. But I just want to add something to
the existing onRollOver.
Someone?
2006/8/11, Martin Wood <[EMAIL PROTECTED]>:
Matthias Dittgen wrote:
> Hello list,
>
> my tooltip class uses code like this "mc.onRollOver = function() {}"
> to add its tooltip functionality to a movieclip mc. But this way it
> overwrites the onRollOver method of mc and disables the functionality
> like highlighting.
>
> So now my question (probably a really simple one): How is it possible
> to append functionality instead of overwriting? is there something
> like "super()" is for cunstructors?
exactly.
super.onRollOver()
will call the method in the superclass.
martin
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Re: [Flashcoders] how to not overwrite methods, but append functionality
Matthias Dittgen wrote:
Hello list,
my tooltip class uses code like this "mc.onRollOver = function() {}"
to add its tooltip functionality to a movieclip mc. But this way it
overwrites the onRollOver method of mc and disables the functionality
like highlighting.
So now my question (probably a really simple one): How is it possible
to append functionality instead of overwriting? is there something
like "super()" is for cunstructors?
exactly.
super.onRollOver()
will call the method in the superclass.
martin
___
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http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
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[Flashcoders] how to not overwrite methods, but append functionality
Hello list,
my tooltip class uses code like this "mc.onRollOver = function() {}"
to add its tooltip functionality to a movieclip mc. But this way it
overwrites the onRollOver method of mc and disables the functionality
like highlighting.
So now my question (probably a really simple one): How is it possible
to append functionality instead of overwriting? is there something
like "super()" is for cunstructors?
Thanks,
Matthias
___
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