AS3 MOUSE_OVER VS. ROLL_OVER
A lot of Flash developers I come across have an issue with mouse actions when MovieClips are embedded inside other MovieClips. AS3 has multiple ways to handle embedded mouse actions within MovieClips. The two main ways are MOUSE_OVER and ROLL_OVER. They sound the same but have slight differences.
MOUSE_OVER
MOUSE_OVER will be triggered when you first rollover the main MovieClip. It will also be triggered every time you rollover any MovieClip inside the main MovieClip. This can get dangerous when you have additional buttons inside the main MovieClip with MOUSE_OUT functionality. Be careful because your MOUSE_OVER functionality will be called multiple times.
* If you set the main MovieClip to mouseChildren = false, it will prevent the MOUSE_OVER action being triggered when you mouse over any embedded MovieClip. Be careful though because you will not be able to add any mouse actions to those embedded MovieClips.
ROLL_OVER
ROLL_OVER will be triggered when you first rollover the main MovieClip. It will not be triggered again until you roll out of the main MovieClip and back over it. You can rollover as many embedded MovieClips as you want without it being triggered multiple times. ROLL_OVER is best for when you have embedded MovieClips with mouse actions.
MOUSE_OVER
MOUSE_OVER will be triggered when you first rollover the main MovieClip. It will also be triggered every time you rollover any MovieClip inside the main MovieClip. This can get dangerous when you have additional buttons inside the main MovieClip with MOUSE_OUT functionality. Be careful because your MOUSE_OVER functionality will be called multiple times.
* If you set the main MovieClip to mouseChildren = false, it will prevent the MOUSE_OVER action being triggered when you mouse over any embedded MovieClip. Be careful though because you will not be able to add any mouse actions to those embedded MovieClips.
ROLL_OVER
ROLL_OVER will be triggered when you first rollover the main MovieClip. It will not be triggered again until you roll out of the main MovieClip and back over it. You can rollover as many embedded MovieClips as you want without it being triggered multiple times. ROLL_OVER is best for when you have embedded MovieClips with mouse actions.
Posted by Mike at 9/29/2009 12:46 PM 
Categories: Demo,ActionScript 3
Tags: AS3 ROLL_OVER MOUSE_OVER ActionScript 3
Categories: Demo,ActionScript 3
Tags: AS3 ROLL_OVER MOUSE_OVER ActionScript 3
Saved my life. ;P
Thanks.
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