fix antd.notification

You can use `confirmLoading` to cancel button loading status.

```
onOk() {
  ...
  this.setState({
    confirmLoading: false
  });
}
```

Fix #322

初始化时监听, 共享同一个 mousePosition

1. 关闭取消按钮的修复
2. 优化 loading 按钮的效果