MACROMEDIA FLASH MX 2004-USING COMPONENTS Use Manual page 798

The second usage example uses a dispatcher/listener event model. A component instance
(
componentInstance
function, also called a handler, on a listener object (
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 contain
eventObject
information about the event. You can use these properties to write code that handles the event.
Finally, you call the
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
Example
The following code disables a Button component,
component,
txt
var txt:mx.controls.TextInput;
var btn:mx.controls.Button;
var txtListener:Object = new Object();
txtListener.focusOut = function() {
_root.btn.enabled = true;
}
txt.addEventListener("focusOut", txtListener);
var txtListener2:Object = new Object();
txtListener2.focusIn = function() {
_root.btn.enabled = false;
}
txt.addEventListener("focusIn", txtListener2);
See also
EventDispatcher.addEventListener()
UIComponent.getFocus()
Availability
Flash Player 6 (6.0 79.0).
Edition
Flash MX 2004.
Usage
componentInstance.getFocus();
Parameters
None.
798 Chapter 6: Components Dictionary
) dispatches an event (in this case,
EventDispatcher.addEventListener()
"EventDispatcher class" on page
, and enables the button when the user click on it:
focusOut
listenerObject
method on the component
415.
, while a user types in the TextInput
btn
,
UIComponent.focusIn
) and the event is handled by a
) that you create. You define