pixxid

Show Me More: Paging Array Collections

I have been working for a while recently on grooveshark’s newest feature: activity I needed to come up with a way for our array collections to only render or show a small set of what feeds actually have in them. [People stop listening to so much damn music.]

What is great about array collections is they handle all sorts of stuff for you, such as binding and updates. But what’s really great is the ability to differentiate a view from the underlying data, which allows you the use of filters for features like active searching on a collection.

So what I needed was a way to click show more and it would reveal the next set.

And extend and implement…

private var _pagesVisible:uint = 1;

[ChangeEvent("collectionChange")]
public function get pagesVisible():uint
{
     return _pagesVisible;
}

public function set pagesVisible(value:uint):void
{
     // allow it to be ready for soon to be populated data
     if (value <= (pages+1)) {
           _pagesVisible = value;
           this.refresh();
     }
}

private function feedFilter(item:Object):Boolean
{
     var isIncluded:Boolean
          = (source.indexOf(item) < PAGE_SIZE * pagesVisible);
     hasMorePages = !isIncluded;
     return (isIncluded);
}

Tags: actionscript

by Joe Kelly