MACROMEDIA FLASH 8-COMPONENTS LANGUAGE Reference page 186

Using a dispatcher/listener event model, a component instance (
dispatches an event (in this case,
called a handler, on a listener object (
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 contain information about
the event. You can use these properties to write code that handles the event. For more
information, see "EventDispatcher class" on page
Finally, you call the
addEventListener()
broadcasts the event to register the listener with the instance. When the instance dispatches
the event, the listener is called.
Example
With a ComboBox instance
to the Output panel that indicates the item index and the event when the pointer rolls on or
off an item:
my_cb.addItem({data:1, label:"First Item"});
my_cb.addItem({data:2, label:"Second Item"});
// Create Listener Object.
var cbListener:Object = new Object();
cbListener.itemRollOver = function(evt_obj:Object) {
trace("index: "+evt_obj.index+", event: "+evt_obj.type);
};
cbListener.itemRollOut = function(evt_obj:Object) {
trace("index: "+evt_obj.index+", event: "+evt_obj.type);
};
// Add Listener.
my_cb.addEventListener("itemRollOver", cbListener);
my_cb.addEventListener("itemRollOut", cbListener);
See also
ComboBox.itemRollOver
184 ComboBox component
) and the event is handled by a function, also
itemRollOut
listenerObject
method on the component instance that
on the Stage, the following ActionScript sends a message
my_cb
,
EventDispatcher.addEventListener()
comboBoxInstance
) that you create. You define a method
499.
)
)
eventObject