Repackaging the RSS feed program: The RSSFeed Class

December 16th, 2009 · No Comments · AS3 Custom Classes

The RSSFeed Class presented in this post was derived directly from the code in the previous post. Parameters passed to the class include the address of the feed and the range of displayed items. The class returns an array of the requested rss data.

The code below creates an instance of the RSSFeed class named xo with an event listener waiting for a message that the processing of the rss feedhas been completed. On completion, the rssDataReady function is called which, in turn, calls the class function getResultSet which returns the array holding the requisite rss data. Three instances of the HTMLTextMultiline class are then used to display the data.

// import required classes
import com.dtk.RSSFeed;
import com.dtk.HTMLTextMultiline;
 
// instance of RSSFeed class instructed to display 1st through 6th items in feed
var xo:RSSFeed = new RSSFeed ( 'http://feeds.feedburner.com/TechCrunch', 0, 5 );
 
// event listener waiting for COMPLETE event & calling rssDataReady function
xo.addEventListener( Event.COMPLETE, rssDataReady ); 
 
// function called on COMPLETE event
function rssDataReady ( e:Event ):void
{
	// init new array
	var feed:Array = [];
 
	// transfer returned rss results to new array
	feed = xo.getResultSet();
 
	// init y position
	var yPos:uint = 10;
 
	// process display of items
	for ( var i:uint=0; i<feed.length; i++ )
	{
		// sprite parent to each rss item
		var entry:Sprite = new Sprite();
		addChild( entry );
 
		// wrap title in HTML bold tags
		var rssTitle:String = '<b>' + feed[i].rssTitle + '</b>';
 
		// convert to linked title by wrapping in HTML link tags & underline
		var linkedTitle:String = "<a href='" + feed[i].link + "'><u>" + rssTitle + "</u></a>";
 
		// display linked title with instance of HTMLTextMultiline class
		var tt:HTMLTextMultiline = new HTMLTextMultiline( 340, 'Verdana', 12, 0x333333, 'LEFT', 0, linkedTitle );
		tt.x = 10;
		tt.y = yPos;
		entry.addChild( tt );
 
		// display publish date
		var dt:HTMLTextMultiline = new HTMLTextMultiline( 110, 'Verdana', 11, 0x333333, 'LEFT', 0, feed[i].published );
		dt.x = 350;
		dt.y = yPos;
		entry.addChild( dt );
 
		// increment y position by sprite height which is determined by textfield height
		yPos += entry.height;
 
		// display description which will automatically display any images included with another instance of HTMLTextMultiline class
		var ml:HTMLTextMultiline = new HTMLTextMultiline( 470, 'Verdana', 12, 0x333333, 'LEFT', 0, feed[i].description );
		ml.x = 10;
		ml.y = yPos;
		entry.addChild( ml );
 
		// get description textfield height (I reduced by 20)
		var entryHeight = entry.height - 20;
 
		// increment to starting y position of next item
		yPos += entryHeight;
	}
}

Actionscript 3 Designer Toolkit

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