ActionScript for Flash MX: The Definitive Guide, Second Edition

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Event Handlers Applied

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5. Finally, to engage the event handler, attach the process clip to the appropriate

timeline using attachMovie().

6. To disengage the handler, remove the

process clip using removeMovieClip().

To see this technique in action, download “Event Loop, Controllable” from the

online Code Depot.

Event Handlers Applied

We’ll conclude our exploration of ActionScript events and event handlers with a

couple of real-world examples. These are simple applications, but they give us a

sense of how flexible event-based programming can be. For more event code sam-

ples, see the Language Reference coverage of the events associated with the objects

listed at the beginning of this chapter.

Example 10-2 makes a clip named

box_mc shrink and grow. The box_mc clip must be

square, and must have an initial size between

box_mc.maxHeight and box_mc.minHeight.

Example 10-3 simulates a custom mouse pointer by hiding the normal system

pointer and making a clip follow the mouse location around the screen. In the exam-

ple, the onMouseDown( ) and onMouseUp( ) handlers resize the custom pointer

slightly to indicate mouseclicks. The code is placed inside the clip that acts as the

custom pointer.

Example 10-2. Oscillating the size of a movie clip

// Set oscillation parameters

box_mc.sizeIncrement = 10; ...