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Asked: 2026-05-10T22:13:41+00:00

I have a Canvas in a Flex application which has items inside it that

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I have a Canvas in a Flex application which has items inside it that cover only about 50% of the area of the main canvas.

i want the canvas to respond to rollOver events for the full area, and not just the area that is covered by the items inside.

I have been setting the following attributes to achieve this :

<mx:Canvas backgroundColor='white' backgroundAlpha='.01' rollOver='rollOver(event)'>...

This causes the entire canvas to respond to rollOver events. It works great – I’m just not happy with it and figure there must be a better way to achieve it.

Is there a way to force mouse events to act on the entire area of a UIComponent?

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  1. What you are doing is perfectly acceptable, although using the arbitrary alpha value of 0.01 is unnecessary, you can set it’s backgroundAlpha to a simple 0.

    I routinely use Canvases for complicated multi layered UI’s and set up my default Canvas style via css to have a backgroundAlpha of 0 and a backgroundColor of #ffffff, then, if I need a canvas to actually be visible I adjust it’s individual backgroundAlpha and backgroundColor properties.

    There’s nothing wrong with setting a graphic object’s alpha to 0 so that it still responds to events but hasn’t been ‘turned off’ entirely, us AS coders do it all the time!

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