MACROMEDIA FLEX-FLEX ACTIONSCRIPT LANGUAGE Reference page 367

Mouse.onMouseWheel
Availability
Flash Player 6 (Windows only).
Usage
someListener.onMouseWheel = function ( [ delta [, scrollTarget ] ] ) {
// your statements here
}
Parameters
An optional number indicating how many lines should be scrolled for each notch the
delta
user rolls the mouse wheel. A positive
indicates a downward scroll. Typical values are from 1 to 3; faster scrolling can produce larger
values.
scrollTarget
mouse pointer when the mouse wheel is rolled. If you want to specify a value for
but don't want to specify a value for
Returns
Nothing.
Description
Listener; notified when the user rolls the mouse wheel. To use the
must create a listener object. You can then define a function for
addListener()
Note: Mouse wheel event listeners are available only in Windows versions of Flash Player.
Example
The following example shows how to create a listener object that responds to mouse wheel events.
In this example, the x coordinate of a movie clip object named
user rotates the mouse wheel:
var mouseListener:Object = new Object();
mouseListener.onMouseWheel = function(delta) {
clip_mc._x += delta;
}
Mouse.addListener(mouseListener);
The following example draws a line that rotates when you rotate the mouse wheel. Click the SWF
file at runtime and then rotate your mouse wheel to see the movie clip in action.
this.createEmptyMovieClip("line_mc", this.getNextHighestDepth());
line_mc.lineStyle(2, 0xFF0000, 100);
line_mc.moveTo(0, 100);
line_mc.lineTo(0, 0);
line_mc._x = 200;
line_mc._y = 200;
var mouseListener:Object = new Object();
delta
An optional parameter that indicates the topmost movie clip instance under the
delta
to register the listener with the Mouse object.
value indicates an upward scroll; a negative value
, pass for .
null delta
onMouseWheel
clip_mc
scrollTarget
listener, you
onMouseWheel
and use
changes each time the
Mouse.onMouseWheel 367