Limiting the Capacity of a JTextComponent : JTextComponent « Swing JFC « Java

1. Java
2. Swing JFC
3. JTextComponent

Limiting the Capacity of a JTextComponent

  

import javax.swing.JTextField;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.JTextComponent;
import javax.swing.text.PlainDocument;

public class Main {
  public static void main(String[] argv) {
    JTextComponent textComp = new JTextField();
    textComp.setDocument(new FixedSizePlainDocument(10));
  }
}

class FixedSizePlainDocument extends PlainDocument {
  int maxSize;
  public FixedSizePlainDocument(int limit) {
    maxSize = limit;
  }

  public void insertString(int offs, String str, AttributeSet a) throws BadLocationException {
    if ((getLength() + str.length()) <= maxSize) {
      super.insertString(offs, str, a);
    } else {
      throw new BadLocationException("Insertion exceeds max size of document", offs);
    }
  }
}

   
    
  

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