文字の連続表示

/**
 * Copyright Makoto_Tanaka ( http://wonderfl.net/user/Makoto_Tanaka )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/uUEk
 */

package {
    import flash.utils.Timer;
    import flash.events.TimerEvent;
    
    import flash.text.TextField;
    import flash.text.TextFormat;
    import flash.text.TextFieldAutoSize;
    
    import flash.display.Sprite;
    
    public class TextTest extends Sprite {
        var _textField:TextField;
        var _msg:String = "Hello World";
        var _timer:Timer;
        
        public function TextTest() {
            // テキストの書式
            var tf:TextFormat = new TextFormat();
            tf.font = "_typewriter";
            tf.size = 18;
            tf.color = 0x0000FF;
            
            // テキストフィールドの作成
            _textField = new TextField();
            _textField.x = 100;
            _textField.y = 50;
            _textField.autoSize = TextFieldAutoSize.LEFT;
            _textField.background = true;
            _textField.backgroundColor = 0xFFFF00;
            _textField.defaultTextFormat = tf;
            addChild(_textField);
            
            // Timerの設定
            _timer = new Timer(100, _msg.length);
            _timer.addEventListener(TimerEvent.TIMER, onTimer);
            _timer.start();
        }
        
        /**
         * TimerEvent
         * 一文字ずつ文字を表示する
         */
        private function onTimer(e:TimerEvent):void {
            var char:String = _msg.charAt(_timer.currentCount-1);
            _textField.appendText(char);
        }
    }
}