Groovy / grails如何确定数据类型？(Groovy / grails how to determine a data type?)

 以下是几个选项： 
 
 
 
 简单的方法是在文本框之外创建一个标签 （在左边），使用这些字符。 （用户简单易懂） 
 
 
 创建一个第二个只读文本框以在开始时使用，将其设置为匹配输入，并将它们彼此对齐。 是的，你会得到一个像素线分割它们，但我认为这将增加用户体验，使其显而易见这不是搞砸（我会亲自选择这个选项） 
 
 
 如果您需要风格，您可以滚动自己的用户控件 ，使用面板，标签和文本框，并根据需要设置适当的边框样式。 （获得所需的确切样式的最佳方式） 
 
 
 第四个更烦人的方式是处理文本框本身的一个关键事件（如KeyDown ）。 有了这个，你可以做许多检查，改变插入位置使其工作，但相信我，这将使你的头努力使其工作完美！ （方式太多努力才能正确） 
 
 
 总而言之，我认为选项2是最好的。 当然，如果你使用WPF，你无疑会有更大的灵活性。 

Here are a few options:
 
 
 
The easy way is to just create a label outside the text box (to the left) with those characters. (simple and easy to understand for the user)
 
 
Create a second readonly text box to use at the start, style it to match the input one and align them next to each other. Yes, you will get a single pixel line to split them both, but I think this will add to the user experience to make it obvious this is not for messing with (I would personally choose this option)
 
 
If you need the style you can roll your own user control that uses a panel, label and textbox with appropriate border styling set as needed. (best way to get the exact style you need)
 
 
The fourth, more annoying way, would be to handle one of the key events (such as KeyDown) on the textbox itself. With this you can do numerous checks and alter the caret position to make it work, but trust me this will do your head in trying to get it working perfectly! (way too much hard work to get right)
 
 
To summarise, I think option 2 is the best here. Of course if you were using WPF you would undoubtedly have a lot more flexibility in styling.