Flex TLF 分页代码

private function createPages(text:String,format:String,width:int,height:int):Array
 {
   var lines:Array = [];
   var flow:TextFlow = TextConverter.importToFlow(text,format);
   var factory:TextFlowTextLineFactory = new TextFlowTextLineFactory();
   factory.compositionBounds = new Rectangle(0,width,10000);
   factory.createTextLines(lines.push,flow);
       
   var pages:Array = [];
   var page:UIComponent;
   var dy:int = 0;
   for (var i:int = 0; i < lines.length; i++) {
     var line:TextLine = lines[i] as TextLine;
     if (dy+line.y+line.descent > height) {
       page = null;
       dy = -(line.y-line.ascent);
     }
     if (page == null) {
       page = new UIComponent();
       page.y = dy;
       pages.push(page);
     }
     page.addChild(line);
   }
   return pages;
 }