package
{
    import flash.display.Sprite;
    import flash.events.MouseEvent;
    import flash.geom.Point;
    import flash.geom.Rectangle;
    import flash.text.engine.*;
    import flash.ui.Mouse;
    import flash.ui.MouseCursor;
    
    [SWF(width="400", height="125")]
    public class FTEDemo7 extends Sprite
    {
        private var beginIndex:int = -1;
        private var endIndex:int = -1;
        private var lines:Array = [];
        
        public function FTEDemo7()
        {
            var elements:Vector.<ContentElement> = new Vector.<ContentElement>();
            elements.push(
                createTextElement('He ', 20),
                createTextElement('who loves ', 16),
                createTextElement('practice ', 26),
                createTextElement('without ', 16),
                createTextElement('theory ', 26),
                createTextElement('is like the ', 16),
                createTextElement('sailor ', 20),
                createTextElement('who boards his ship without a ', 16),
                createTextElement('rudder ', 26),
                createTextElement('and ', 16),
                createTextElement('compass ', 26),
                createTextElement('and ', 16),
                createTextElement('never knows where he may cast.', 24),
                createTextElement('\n - Leonardo da Vinci', 22)
            );
            
            var i:int = 0;
            var block:TextBlock = new TextBlock(new GroupElement(elements));
            var line:TextLine = block.createTextLine(null, 400);
            var _y:Number = 0;
            while(line)
            {
                lines.push(addChild(line));
                _y += line.height;
                line.y = _y;
                line.addEventListener(MouseEvent.MOUSE_DOWN, onMouseDown);
                line.addEventListener(MouseEvent.MOUSE_MOVE, onMouseMove);
                line.addEventListener(MouseEvent.ROLL_OVER, onRoll);
                line.addEventListener(MouseEvent.ROLL_OUT, onRoll);
                line = block.createTextLine(line, 400);
            }
        }
        
        private function createTextElement(text:String, size:int):TextElement
        {
            return new TextElement(text, new ElementFormat(
                                   new FontDescription("Times", FontWeight.NORMAL, FontPosture.NORMAL, FontLookup.EMBEDDED_CFF),
                                   size)
                                   );
        }
        
        private function onMouseDown(event:MouseEvent):void
        {
            stage.addEventListener(MouseEvent.MOUSE_UP, onMouseUp);
            graphics.clear();
            var line:TextLine = TextLine(event.target);
            beginIndex = line.textBlockBeginIndex + line.getAtomIndexAtPoint(event.stageX, event.stageY);
        }
        
        private function onMouseMove(event:MouseEvent):void
        {
            if(!event.buttonDown)
                return;
            
            var line:TextLine = TextLine(event.target);
            endIndex = line.textBlockBeginIndex + line.getAtomIndexAtPoint(event.stageX, event.stageY);
            drawBackground(beginIndex, endIndex);
        }
        
        private function onMouseUp(event:MouseEvent):void
        {
            stage.removeEventListener(MouseEvent.MOUSE_UP, onMouseUp);
            
            var objs:Array = getObjectsUnderPoint(new Point(event.stageX, event.stageY));
            var obj:Object;
            var found:Boolean = false;
            while(objs.length)
            {
                if(objs.pop() is TextLine)
                {
                    found = true;
                    break;
                }
            }
            
            Mouse.cursor = found ? MouseCursor.IBEAM : MouseCursor.ARROW;
        }
        
        private function drawBackground(begin:int, end:int):void
        {
            graphics.clear();
            
            if(begin > end)
            {
                var begin2:int = begin;
                begin = end;
                end = begin2;
            }
            
            var line:TextLine;
            for(var i:int = 0; i < lines.length; i++)
            {
                line = lines[i];
                if(line.textBlockBeginIndex <= begin && (line.textBlockBeginIndex + line.rawTextLength) >= begin)
                    break;
            }
            
            var startLine:TextLine = line;
            
            for(i = 0; i < lines.length; i++)
            {
                line = lines[i];
                if(line.textBlockBeginIndex <= end && (line.textBlockBeginIndex + line.rawTextLength) >= end)
                    break;
            }
            
            var endLine:TextLine = line;
            line = startLine;
            var bounds:Rectangle;
            
            // Don't ever do this!
            // I'm only doing this because I don't want errors 
            // and I didn't have time to vet this math 100%.
            try
            {
                while(true)
                {
                    if(line == null)
                        break;
                    
                    if(line == startLine)
                    {
                        if(startLine == endLine)
                            bounds = line.getAtomBounds(Math.min(Math.max(begin - line.textBlockBeginIndex, 0), line.rawTextLength - 1)).union(line.getAtomBounds(Math.min(Math.max(end - line.textBlockBeginIndex, 0), line.rawTextLength - 1)));
                        else
                            bounds = line.getAtomBounds(Math.min(Math.max(begin - line.textBlockBeginIndex, 0), line.rawTextLength - 1)).union(line.getAtomBounds(line.rawTextLength - 1));
                        bounds.x += line.x;
                        bounds.y += line.y;
                    }
                    else if(line == endLine)
                    {
                        bounds = line.getAtomBounds(Math.min(Math.max(end - line.textBlockBeginIndex, 0), line.rawTextLength - 1)).union(line.getAtomBounds(0));
                        bounds.x += line.x;
                        bounds.y += line.y;
                    }
                    else
                        bounds = line.getBounds(line.parent);
                    
                    graphics.beginFill(0x003399, 0.25);
                    graphics.drawRect(bounds.x, bounds.y, bounds.width, bounds.height);
                    
                    if(line == endLine)
                        break;
                    
                    line = line.nextLine;
                }
            }
            catch(e:Error)
            {
                // Do noooothing
            }
        }
        
        private function onRoll(event:MouseEvent):void
        {
            Mouse.cursor = (event.type == MouseEvent.ROLL_OVER || event.buttonDown) ? MouseCursor.IBEAM : MouseCursor.ARROW;
        }
        
        [Embed(source="assets/Times New Roman.ttf", embedAsCFF="true", fontFamily="Times")]
        private var times:Class;
    }
}