RE: [flexcoders] Change Events for Custom Classes

[Gordon Smith]

Title: Message





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 
  AMTo: '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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