在TextArea,Java中使用Document Listener时出现java.lang.IllegalStateException [英] java.lang.IllegalStateException while using Document Listener in TextArea, Java
问题描述
DocumentListener dl = new MessageDocumentListener();
((AbstractDocument) nboxArea.getDocument()).setDocumentFilter(new DocumentFilter() {
public void insertString(FilterBypass fb, int offset, String string, AttributeSet attr) throws BadLocationException {
string = string.replaceAll("\t", "");
super.insertString(fb, offset, string,(javax.swing.text.AttributeSet) attr);
}
public void replace(FilterBypass fb, int offset, int length, String text, AttributeSet attrs) throws BadLocationException {
text = text.replaceAll("\t", "");
//TODO must do something here
super.replace(fb, offset, length, text,(javax.swing.text.AttributeSet) attrs);
}
});
JTextArea evArea = (JTextArea) c;
evArea.getDocument().removeDocumentListener(dl);
evArea.setText(originalMessage);
在这种情况下,我在textarea中设置文本时发现了以下错误。我不知道如何解决。
In this case I found the following error during set text in textarea. I do not know how to resolve.
Exception in thread "AWT-EventQueue-0"
java.lang.IllegalStateException: Attempt to mutate in notification
我认为问题是在文档中设置文本或在文档中设置文档文件听众。但我不知道如何解决这个问题。请帮我解决这个问题。
I think the problem is to set text in document or setting document in document listener. But I do not know how to solve this. Please help me to solve this issue.
推荐答案
您无法修改DocumentListener中的文档。编写一个自定义文档,它会覆盖insertString()或remove()方法。
You cannot modify the document inside the DocumentListener. Write a custom Document instead, which overrides the insertString() or remove() methods.
来自Java教程:如何编写DocumentListener
文档监听器不应修改文档的内容;在收听者收到更改通知时,更改已完成。而是编写一个自定义文档来覆盖insertString或删除方法,或两者兼而有之。有关详细信息,请参阅收听文档更改 。
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