i think i'm misunderstood; because your solution suggestions does not
fit my problem.
first of all, functions can be binded. (with an event driven
architecture that triggers
the function to be executed and all bindable references be updated)
to see how it is done, take a look at the article in flex api :
http://127.0.0.1:64744/help/index.jsp?topic=/com.adobe.flexbuilder.help/html/databinding_4.html
(or search for "[Bindable] function" then click the second result)
after this quick information, i want to refigure my problem.
assume: myInstance:MyClass; //MyClass implements a bindable toString method
my problem has two parts:
1st; when i use function biding (<textInput
text="{myInstance.toString()}"/>) , function binding works fine
except the itemRenderer (<textInput text="{data.toString()}"/>)
why? what is the problem? can't the VM detect the binding mechanism? (by
the way there isn't any compile time
warnings about the binding will not be able to run properly)
2nd: if i do not write toString (<textInput text="{myINstance}"/>),
although it calls toString method to find the
text value, function binding does never work (neither in itemRenderers
nor normal usage).
why? why cant the compiler detect the binding?
thnks in advance.
Frederico Garcia wrote On 12/26/2007 05:38 PM:
Jhonny Everson escreveu:
>
> I guess that your solution has a problem, the circular reference to
> toString.
>
> it could be something like:
>
> [Bindable] public var stringValue:String = "";
> public function toString():String {
>
> ... ( some processing that results in a string var 'string1')
>
> stringValue= string1;
> return stringValue;
> }
>
>
> On 12/26/07, * Frederico Garcia* <[EMAIL PROTECTED]
<mailto:fmotagarcia%40kemelyon.com>
> <mailto:[EMAIL PROTECTED]
<mailto:fmotagarcia%40kemelyon.com>>> wrote:
>
> yigit escreveu:
> > hi all;
> > i have a custom class which has a toString method; so i can
> directly use
> > it as a source to textInput's text field.
> > i want to make binding work, i mean when the result of the toString
> > changes, i want the view to update itself automatically.
> > nameID field of roleRef is an instance of my class that implements
> > toString with function biding.
> > when i use this way:
> > <mx:Label id="lbl" text="{roleRef.nameID}"/>
> > function binding on toString does not work
> > when i use this way:
> > <mx:Label id="lbl" text="{roleRef.nameID.toString()}"/>
> > function biding on toString works, but inside an item renderer,
> it does
> > not work.
> > <mx:Label id="lbl" text="{data.nameID.toString()}"/>
> >
> >
> > is this a compiler bug or is this the normal behavior?
> >
> >
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> >
> I believe you can only bind vars and setters. By binding a function i
> think it will only execute the function once. An easy workaround
> is to
> have a var containg the result of the toString function and bind the
> property to that var. Something like:
>
> [Bindable] public var stringValue:String = "";
> public function toString():String {
> stringValue= this.toString();
> return stringValue;
> }
>
> <mx:Label id="lbl" text="{data.nameID.stringValue}"/>
>
> Regards
>
> Frederico Garcia
>
>
>
>
> --
> Jhonny Everson
>
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> This message was checked by NOD32 antivirus system.
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Yes, indeed there was a circular reference to toString. Thanks for the
correction. The general concept is the same though, and I think it's the
best way to solve the "bind to function" problem.
Regards
Frederico Garcia
