I'm trying to validate the input of multiple text boxes (i.e. they should be a number), and found the useful code snippet below here.
我正在尝试验证多个文本框的输入(即它们应该是一个数字),并在此处找到了有用的代码片段。
However, if I have three text boxes (text
, moreText
and evenMoreText
), how can I apply a verify listener with the same functionality to each, without having to repeat the (.addVerifyListener(new VerifyListener() {...
) code three times?
但是,如果我有三个文本框(text,moreText和evenMoreText),我如何应用具有相同功能的验证侦听器,而不必重复(.addVerifyListener(新的VerifyListener(){...)代码三次?
I don't want to implement a switch statement or similar (to decide which text box to apply it to), I want something more generic (that I can perhaps make available for other classes to use in the future).
我不想实现switch语句或类似的(决定将它应用于哪个文本框),我想要更通用的东西(我可以将其用于将来使用的其他类)。
text.addVerifyListener(new VerifyListener() {
@Override
public void verifyText(VerifyEvent e) {
final String oldS = text.getText();
final String newS = oldS.substring(0, e.start) + e.text + oldS.substring(e.end);
try {
BigDecimal bd = new BigDecimal(newS);
// value is decimal
// Test value range
} catch (final NumberFormatException numberFormatException) {
// value is not decimal
e.doit = false;
}
}
});
1 个解决方案
#1
5
Define the VerifyListener
beforehand and get the actual Text
from the VerifyEvent
:
事先定义VerifyListener并从VerifyEvent获取实际的Text:
VerifyListener listener = new VerifyListener()
{
@Override
public void verifyText(VerifyEvent e)
{
// Get the source widget
Text source = (Text) e.getSource();
// Get the text
final String oldS = source.getText();
final String newS = oldS.substring(0, e.start) + e.text + oldS.substring(e.end);
try
{
BigDecimal bd = new BigDecimal(newS);
// value is decimal
// Test value range
}
catch (final NumberFormatException numberFormatException)
{
// value is not decimal
e.doit = false;
}
}
};
// Add listener to both texts
text.addVerifyListener(listener);
anotherText.addVerifyListener(listener);
If you want to use it in other places as well, create a new class:
如果您想在其他地方使用它,请创建一个新类:
public class MyVerifyListener implements VerifyListener
{
// The above code in here
}
and then use:
然后使用:
MyVerifyListener listener = new MyVerifyListener();
text.addVerifyListener(listener);
anotherText.addVerifyListener(listener);
#1
5
Define the VerifyListener
beforehand and get the actual Text
from the VerifyEvent
:
事先定义VerifyListener并从VerifyEvent获取实际的Text:
VerifyListener listener = new VerifyListener()
{
@Override
public void verifyText(VerifyEvent e)
{
// Get the source widget
Text source = (Text) e.getSource();
// Get the text
final String oldS = source.getText();
final String newS = oldS.substring(0, e.start) + e.text + oldS.substring(e.end);
try
{
BigDecimal bd = new BigDecimal(newS);
// value is decimal
// Test value range
}
catch (final NumberFormatException numberFormatException)
{
// value is not decimal
e.doit = false;
}
}
};
// Add listener to both texts
text.addVerifyListener(listener);
anotherText.addVerifyListener(listener);
If you want to use it in other places as well, create a new class:
如果您想在其他地方使用它,请创建一个新类:
public class MyVerifyListener implements VerifyListener
{
// The above code in here
}
and then use:
然后使用:
MyVerifyListener listener = new MyVerifyListener();
text.addVerifyListener(listener);
anotherText.addVerifyListener(listener);