可以用另一个便利函数抽象这个过程，如清单5所示。
You can abstract this out with yet another convenience function, shown in Listing 5.
接下来是一系列的便利函数，每个函数负责点击-拖动过程的一个方面。
What follows is a series of convenience functions, each of which takes care of one aspect of the click-and-drag process.
最后，还有几个便利函数让您更轻松地使用PHP X forms库，如清单13所示。
Finally, there are just a few more convenience functions to help make your use of this PHP XForms library a little easier, as shown in Listing 13.
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