RE: [flexcoders] Change Events for Custom Classes

[Andora, Greg]

Title: Message

Thanks a lot, I had quite a brain fart there...

Thanks,
Greg Andora

-----Original Message-----
From: Gordon Smith [mailto:[EMAIL PROTECTED]
Sent: Monday, March 28, 2005 8:02 PM
To: 'flexcoders@yahoogroups.com'
Subject: RE: [flexcoders] Change Events for Custom Classes

If all you want to do is get myProperty_Changed() to execute when the app does MyClass.myProperty=5, you don't necessarily need any events.

 

"Getter" and "setter" functions let you execute code when you read or write a property:

 

    // storage for myProperty property

    private var _myProperty;

 

    // The getter function executes when somebody does value = myClass.myProperty;

    public function get myProperty

    {

        return _myProperty

    };

 

    // The setter function executes when somebody does myClass.myProperty = value

    public function set myProperty(value)

    {

        _myProperty = value;

 

        // Perform some side effects

        myProperty_Changed();

    }

 

If you really need to dispatch an event, you would call dispatchEvent() in the setter.

 

- Gordon

-----Original Message-----
From: Andora, Greg [mailto:[EMAIL PROTECTED]
Sent: Monday, March 28, 2005 11:55 AM
To: 'flexcoders@yahoogroups.com'
Subject: [flexcoders] Change Events for Custom Classes

I'm wondering if there is a way (and if there is, how would I go about doing it) I can create a change event for a custom MXML class based for a public property.

For example, I have an MXML file called MyClass and when the parent application changes "myProperty" (i.e MyClass.myProperty=5), I want my custom class to respond by calling the private function myProperty_Changed():

<mx:Canvas xmlns:mx="http://www.macromedia.com/2003/mxml"
        width="{lookupWidth}"
        focusOut="" >
               
        <mx:Script>
                <![CDATA[
                        public var myProperty;

                        private function myProperty_Changed()
                                {
                                        Do Stuff Here when myProperty is changed by the application it is being used in;

                                }
                ]]>
        </mx:Script>
        <mx:TextInput id="text1" />
</mx:Canvas>

Thanks,
Greg Andora

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