Comments on: ItemRenderer TileList issues

By: Josh Knopp

Josh Knopp — Fri, 26 Feb 2010 17:46:28 +0000

@Balu – I realize this is an older post, but if anyone stumbles across this page looking for help on the checkbox issue (like I did) check out http://cookbooks.adobe.com/post_Why_is_a_DataGrid_item_renderer_state_being_change-12167.html for help. The example refers specifically to a DataGrid, but the same concept applies to a TileList with an itemRenderer that includes a Checkbox. Basically you just need something in your dataProvider to indicate whether a Checkbox is selected.

Happy flexing!

By: van

van — Sat, 19 Sep 2009 04:35:17 +0000

Thanks for this article. It’s really good.
I have the same problem when scrolling with custom ItemTreeRenderer with dataprovider from XML, not ItemListRenderer. My tree have custom images in tree nodes.They reload each time i drag the scroll bar. I don’t know how to use VO class like yours to have parent tree nodes. Do you have any solution for my problem?

By: Balu

Balu — Wed, 08 Jul 2009 11:51:01 +0000

Im also facing problem with TileList with renderer I have a itemrenderer where the custom component have a checkBox and when I try to select some of the items and when i scroll the selection is jumping from one item to another… Please provide me a solution to that

By: admin

admin — Wed, 01 Apr 2009 13:37:03 +0000

Yeah I figured my example would please people enough to trust that it works, I didn’t want to open up the crossdomain to everyone…

You are absolutely right about memory usage and the images being stored in flash, and using up the memory, I do have cache shut off on my browser for development reasons… and so when i inspected it with “service capture” (from what it sounds its about the same as httpFox), i did see the images re downloading all the time…

While it is expensive on memory it’s a little easier on the processor when scrolling… It really just depends on the target audience and if they have a system with enough memory… You bring and excellent point that I forgot to mention!

great reply, thanks for the comments!

By: admin

admin — Mon, 30 Mar 2009 18:10:28 +0000

please note, to develop locally and not use trustContent, you can add a config setting at this url.

http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager04.html (just add the bin-debug folder to the allowed)

By: Erno

Erno — Mon, 30 Mar 2009 16:04:41 +0000

There is bug in your app. Your crossdomain.xml dont allow all users to access your images. To use bitmapdata to images you need to open that folder in crossdomain.xml ( I guess you know this )

There is couple things what you should remember if you do it like this.
If you save image bitmapdata to dictionary it increase flash memory usage. All image data stays in memory and dont go away until you close app.
if you do it normal way ( binding url to Image source ) image goes to browser cache. So it doesn’t actually load that multiple times.
If you check your example with httpFox (firefox plugin ) you see that image is loaded only once. Next time image comes from cache.

Well memory usage is not big problem if you have small list and pictures are not big. But if you have long list and you scroll it trough, all images are in flash memory and browser use alot of memory.