December 2002
Intermediate to advanced
1088 pages
192h 4m
English
Content preview from ActionScript for Flash MX: The Definitive Guide, Second Edition
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Key.onKeyUp() Listener Event
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ActionScript Language Reference
Usage
To emulate onKeyDown( ) in Flash 5, use a movie clip onClipEvent(keyDown) clip event
attached to the clip at authoring time. For example:
onClipEvent (keyDown) {
trace("Some key was pressed");
}
See Also
Key.addListener( ), Key.getAscii( ), Key.getCode( ), Key.isToggled( ), Key.onKeyUp( ),
MovieClip.onKeyDown( )
Key.onKeyUp() Listener Event
occurs when a key is released
Flash 6
listener.onKeyUp()
Description
The onKeyUp( ) event is triggered when a key is depressed and then released. It is some-
times used in game programming to turn off something that was turned on by an earlier
onKeyDown( ) event—the classic example being a spaceship’s thrust. The onKeyUp( ) event
can be handled by an event listener, as specified by
listener, that has been added using
addListener( ). The onKeyUp( ) event can also allow a key to modify an application’s
behavior temporarily. For example, in the Flash authoring tool, holding down the spacebar
temporarily switches to the Hand tool, and releasing the spacebar restores the previous
tool. A similar approach can be used to show and hide things in an application, such as
temporary menus.
To respond to an onKeyUp( ) event, we must first assign a callback function to the
onKeyUp
property of some object, ...
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