Hey bilbosax: It's pretty simple to improve the performance of large lists with images. You do this in ItemRenderers:
1. Add ItemRenderer.cacheAsBitmap="true". This also caches all the content as a snapshot for performance. If you will have data changing in the renderer a lot, then you don't need to set this to true, but it's a good idea if performance is an issue. 2. Add a ContentCache class variable (I named mine iconCache): static private const iconCache:ContentCache = new ContentCache(); 2. Set iconCache.maxCacheEntries to the max number you'll need to cache in initialize handler. 3. Assign <your image>.contentLoader = iconCache in ItemRenderer.initialize handler. That's it, you use this approach when rendering remote images with a URL since this approach is unnecessary when using embedded assets that are already cached. So the first time a remote image is pulled with URL (assigning Image.source to URL of an image), it is automatically cached so it doesn't have to be loaded again which happens when scrolling as the item renderer instances are reused. Another approach for smooth scrolling of large lists is to use DataGroup which doesn't recycle item renders but keeps them all alive but the downside is the initial rendering of the list will be slow, but after that the performance will be exceptional. Just depends on whether you want initial up front pain or jerky scrolling the first time through a list. Another tip is to load your ArrayCollection before you assign the list's dataProvider, or if you're using data binding for the lists dataProvider property, when loading the underlying data, turn off autoUpdate in the ArrayCollection to prevent cascading rendering which can be quite slow. arrayCollection.disableAutoUpdate(); // Load your collection from REST API for example arrayCollection.enableAutoUpdate(); arrayCollection.refresh(); // to update the displayList. Hope this helps. Erik Erik Thomas Chief Architect Office: 541.247.2995 / Mobile: 303.304.1466 http://linqto.com <http://linqto.com/> This email may contain confidential and privileged material for the sole use of the intended recipient. Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies. On Aug 30, 2017, at 4:51 PM, bilbosax <waspenc...@comcast.net> wrote: In my AIR app, I am having to download a lot of images to display, especially in lists. I need a good tutorial on how to cache these images using ContentCache, but am having trouble finding any solid examples on the net. Does anyone know of a good place to find out how to effectively use ContentCache in an AIR app?? Thanks! -- Sent from: http://apache-flex-users.2333346.n4.nabble.com/
