How do I force or lock focus in actionscript 3?

I want to create a dialog or alert box, where a开发者_如何学编程 DisplayObject would take and force the focus, until an okay button or something releases the lock. thanks.

The easy way to do this is to make your "dialog" as big as the stage, with a whacking great transparent area around the dialog itself.

The transparent area can listen for any mouse clicks, and just swallow them (which will prevent them being picked up by stuff further back in the display list).

To show the alert, just stick it on top of everything else, When the user closes it, take it away again.

If you are using flex and actionscript, simply use a SkinnablePopUpContainer

var alt:CustomPopUp = new CustomPopUp();
alt.open(this,true) //the second variable is for modal, which will disable view
this.enabled = false; //this will grey out the parent view and provide visual focus to your popup.

To do this, you will need to disable access to all objects under your 'alert' DisplayObject. There are multiple ways of doing this, here 2 I can think off:

1. Loop through the display list and disable any display objects under your alert depth wise.
2. Cheat it with a blocker. When you display your alert, display another clip (could have alpha set to 0 ) that blocks the user from hovering/clicking objects. The blocker might need a bit of setup( buttonMode = true, useHandCursor = false, etc. )

This 'modal' behavior has been around for some so there might be no need to reinvent the wheel, depending of your current setup.

If you're using the Flex framework, you've got the functionality in, for Flash you can use the Alert Manager from the Yahoo! Flash Astra Components:

Goodluck,