flash - Get Notified of Change in Flex Bitmap or BitmapData? -

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in flex, how 1 hook bitmap or bitmapdata variable function notified whenever bitmap's data has changed (pixel has changed, or filter's been added)?

i tried setting binding doesn't work.

there must way it, because can bind mx:image bitmap via 'source' attribute, , displayed image updates time when modify bitmap. how flex it? blindly redraw bitmap @ every frame, or smart , redraws when bitmap changes? if so, how know when bitmap changes?

this sort of semi-educated guess, no testing behind it, take salt.

when flex binds source attribute of image, value of .source of type bitmapasset.

bitmapasset has .bitmapdata property, reference bitmap in question.

i expect binding done flex against .bitmapdata property.

i don't see reason why shouldn't able that, too. think you'd have little circular work, though, you'd have create bitmapasset instance , populate bitmapdata want keep tabs on, bind .bitmapdata property of bitmapasset object.

assuming var called 'bitmapdata', instance of bitmapdata, think following should work.

var bitmapasset:bitmapasset = new bitmapasset(bitmapdata);  var bitmapdatachangewatcher:changewatcher = bindingutils.bindsetter(handlechangetobitmapdata, bitmapasset, "bitmapdata");  private function handlechangetobitmapdata(data:bitmapdata):void {     // handle change bitmap data }

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