MACROMEDIA FLASH 8-COMPONENTS LANGUAGE Reference page 791

The first usage example uses a dispatcher/listener event model. A component instance
( ) dispatches an event (in this case, ) and the event is handled by
listInstance itemRollOut
a function, also called a handler, on a listener object ( ) that you create. You
listenerObject
define a method with the same name as the event on the listener object; the method is called
when the event is triggered. When the event is triggered, it automatically passes an event
object ( ) to the listener object method. Each event object has properties that
eventObject
contain information about the event. You can use these properties to write code that handles
the event. Finally, you call the method on the
EventDispatcher.addEventListener()
component instance that broadcasts the event to register the listener with the instance. When
the instance dispatches the event, the listener is called.
For more information, see "EventDispatcher class (API)" on page 500.
The second usage example uses an handler and must be attached directly to a List
on()
instance. The keyword , used inside an handler attached to a component, refers to
this on()
the component instance. For example, the following code, attached to the List instance
, sends "_level0.my_list" to the Output panel:
my_list
on (itemRollOut) {
trace(this);
}
Example
The following example sends a message to the Output panel that indicates which item index
number has been rolled over:
var my_list:mx.controls.List;
my_list.addItem({data:"flash", label:"Flash"});
my_list.addItem({data:"dreamweaver", label:"Dreamweaver"});
my_list.addItem({data:"coldfusion", label:"ColdFusion"});
// Create listener object.
var listListener:Object = new Object();
listListener.itemRollOut = function(evt_obj:Object) {
trace("Item #" + evt_obj.index + " has been rolled out.");
};
// Add listener.
my_list.addEventListener("itemRollOut", listListener);
See also
List.itemRollOver
List.itemRollOut 787