/**
 * jQuery Plugin to obtain touch gestures from iPhone, iPod Touch and iPad, should also work with Android mobile phones (not tested yet!)
 * Common usage: wipe images (left and right to show the previous or next image)
 *
 * @author Andreas Waltl, netCU Internetagentur (http://www.netcu.de)
 * @version 1.0 (15th July 2010)
 */
(function($) {
   $.fn.touchwipe = function(settings) {
      var config = {
         min_move_x: 20,
         wipeLeft: function() { alert("left"); },
         wipeRight: function() { alert("right"); },
         preventDefaultEvents: true
      };

      if (settings) $.extend(config, settings);

      this.each(function() {
         var startX;
         var isMoving = false;

         function cancelTouch() {
            this.removeEventListener('touchmove', onTouchMove);
            startX = null;
            isMoving = false;
         }

         function onTouchMove(e) {
            if(config.preventDefaultEvents) {
               e.preventDefault();
            }
            if(isMoving) {
               var x = e.touches[0].pageX;
               var dx = startX - x;
               if(Math.abs(dx) >= config.min_move_x) {
                  cancelTouch();
                  if(dx > 0) {
                     config.wipeLeft();
                  }
                  else {
                     config.wipeRight();
                  }
               }
            }
         }

         function onTouchStart(e)
         {
            if (e.touches.length == 1) {
               startX = e.touches[0].pageX;
               isMoving = true;
               this.addEventListener('touchmove', onTouchMove, false);
            }
         }

         try {
            this.addEventListener('touchstart', onTouchStart, false);
         } catch(tError) {

         }
      });

      return this;
   };

})(jQuery);