private void _onItemDroped()
{
SolaEngine engine = SolaEngine.getInstance();
BattleMgr bMgr = (BattleMgr)engine.getMgr(typeof(BattleMgr));
int gold = bMgr.getGold();
int paper = bMgr.getPaper();
goldText.text = gold.ToString();
paperText.text = paper.ToString();
}