One possibility would be to subclass flash.display.Loader and supply that as the backgroundImage "class" then have it load the image with a custom URL
Alex Harui Flex SDK Developer Adobe Systems Inc.<http://www.adobe.com/> Blog: http://blogs.adobe.com/aharui From: flexcoders@yahoogroups.com [mailto:flexcod...@yahoogroups.com] On Behalf Of rdibona Sent: Friday, March 13, 2009 3:44 PM To: flexcoders@yahoogroups.com Subject: [flexcoders] Re: canvas backgroundimage loadercontext Thanks for the reply. Assuming that I am willing to take the risk of the server going down (the images are stored on Amazon S3 so they are pretty safe), how can I have a backgroundimage check the policy file, using LoaderContext or otherwise? This is an app that has been working great for over 2 years and only with one of the latest releases of flash did this break so I am scrambling to try and fix it. The reason I can't really do it as an image with a child index of 0 is because the user can click things and drag them around and I don't want them to accidentally drag the background image -- I'd have to write a bunch of code to work through that scenario so I'd like to exhaust all other options first. Thanks again, Rich --- In flexcoders@yahoogroups.com<mailto:flexcoders%40yahoogroups.com>, Alex Harui <aha...@...> wrote: > > I'd avoid loading foreign content as the backgroundImage. If that server goes > down, your app will look very different. > If you really want to, then it might be easier to put an Image behind all of > the other children and not use backgroundImage > > Alex Harui > Flex SDK Developer > Adobe Systems Inc.<http://www.adobe.com/> > Blog: http://blogs.adobe.com/aharui > > From: flexcoders@yahoogroups.com<mailto:flexcoders%40yahoogroups.com> > [mailto:flexcoders@yahoogroups.com<mailto:flexcoders%40yahoogroups.com>] On > Behalf Of rdibona > Sent: Friday, March 13, 2009 11:15 AM > To: flexcoders@yahoogroups.com<mailto:flexcoders%40yahoogroups.com> > Subject: [flexcoders] canvas backgroundimage loadercontext > > > Hi there, > > I have an application where I take a "snapshot" of a Canvas with various > other images on it using the bitmapdata.draw method. I had to change my code > to use a LoaderContext for each image load to avoid security errors, i.e.: > > var lc : LoaderContext; > var img : Image; > > img = new Image(); > lc = new LoaderContext(true); > img.loaderContext = lc; > img.load(src); > > This has worked fine. However, I cannot figure out how to avoid a security > error when setting the backgroundImage style for a canvas, as it expects a > URL directly with no opportunity to specify another image as the value. It > does say you can specify a class, but how do you cast an image into a > compatible class? The images I am dealing with are dynamically loaded at > run-time so there is no opportunity to use the Embed directive. > > Thanks, > > Rich >
