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162 Chapter 2: ActionScript Language Reference

Button.trackAsMenu

Availability

Flash Player 6.

Usage

my_btn.trackAsMenu:Boolean

Description

Property; a Boolean value that indicates whether other buttons or movie clips can receive mouse

release events. If you drag a button and then release on a second button, the

onRelease event is

registered for the second button. This allows you to create menus. You can set the

trackAsMenu

property on any button or movie clip object. If the

trackAsMenu property has not been defined,

the default behavior is

false.

You can change the

trackAsMenu property at any time; the modified button immediately takes

on the new behavior.

Example

The following example demonstrates how to track two buttons as a menu. Place two button

instances on the Stage called

one_btn and two_btn. Enter the following ActionScript in the

Timeline:

var one_btn:Button;

var two_btn:Button;

one_btn.trackAsMenu = true;

two_btn.trackAsMenu = true

one_btn.onRelease = function() {

trace("clicked one_btn");

};

two_btn.onRelease = function() {

trace("clicked two_btn");

};

Test the SWF file by clicking the Stage over one_btn, holding the mouse button down and

releasing it over

two_btn. Then try commenting out the two lines of ActionScript that contain

trackAsMenu and test the SWF file again to see the difference in button behavior.