package {

    import flash.display.Sprite;
	import flash.text.engine.TextBlock;
	import flash.text.engine.TextLine;
	import flash.text.engine.TextElement;
	import flash.text.engine.ElementFormat;
	import flash.text.engine.FontDescription;
	import flash.text.engine.ContentElement;
	import flash.text.engine.GroupElement;
	import flash.text.engine.TextLineMirrorRegion;
	import flash.events.MouseEvent;
	import flash.events.EventDispatcher;
	import flash.ui.Mouse;

	public class TextLineMirrorRegionExample extends Sprite {
		
		var myEvent:EventDispatcher = new EventDispatcher();
		var fontDescription:FontDescription = new FontDescription();
		var textBlock:TextBlock = new TextBlock();

		public function TextLineMirrorRegionExample():void {
			
			fontDescription.fontWeight = "bold";
			var blackFormat:ElementFormat = new ElementFormat();
			blackFormat.fontSize = 18;
			blackFormat.color = 0x000000;
			blackFormat.fontDescription = fontDescription;
			
			var textElement1 = new TextElement("Click on different parts of me to find the ", blackFormat);
			var textElement2 = new TextElement("mirror regions",blackFormat);
			var textElement3 = new TextElement(". If I am a mirror region, I'll ",blackFormat);
			var textElement4 = new TextElement("turn red",blackFormat);
			var textElement5 = new TextElement(".",blackFormat);
			
			myEvent.addEventListener("click", clickHandler);
			myEvent.addEventListener("mouseOut", mouseOutHandler);
			myEvent.addEventListener("mouseOver", mouseOverHandler);
			
			var groupVector:Vector.<ContentElement> = new Vector.<ContentElement>;
			groupVector.push(textElement1, textElement2, textElement3, textElement4, textElement5);
			var groupElement:GroupElement = new GroupElement(groupVector);
			
			textElement2.eventMirror=myEvent;
			textElement4.eventMirror=myEvent;
			
			textBlock.content = groupElement;
			createLines(textBlock);
		}
	
		private function clickHandler(event:MouseEvent):void
		{
			var redFormat:ElementFormat = new ElementFormat();
			redFormat.color = 0xCC0000;
			redFormat.fontSize = 18;
			redFormat.fontDescription = fontDescription;
			var line:TextLine = event.target as TextLine;
			var region:TextLineMirrorRegion = line.getMirrorRegion(myEvent);
			region.element.elementFormat = redFormat;
			createLines(textBlock);
		}
		
		private function mouseOverHandler(event:MouseEvent):void
		{
			Mouse.cursor = "button";
		}
		
		private function mouseOutHandler(event:MouseEvent):void
		{
			Mouse.cursor = "arrow";
		}
			
		private function createLines(textBlock:TextBlock):void 
		{
			var purgeLine:TextLine = textBlock.firstLine;
				
			while (purgeLine)
			{
				removeChild (purgeLine);
				purgeLine = purgeLine.nextLine;
			}
			var lineWidth:Number = 150;
			var xPos:Number = 15.0;
			var yPos:Number = 20.0;
			var textLine:TextLine = textBlock.createTextLine (null, lineWidth);
				
			while (textLine)
			{
				textLine.x = xPos;
				textLine.y = yPos;
				yPos += textLine.height + 2;
				addChild (textLine);
				textLine = textBlock.createTextLine (textLine, lineWidth);
			}
		}
	}
}