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import java.awt.Toolkit;
import javax.swing.JTextField;
import javax.swing.text.AbstractDocument;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DocumentFilter;
/**
* TextField that can be limited in size (max number of characters typed in)
* @author oma
*
*/
public class LimitedTextField extends JTextField {
public LimitedTextField(int maxLength)
{
super();
AbstractDocument doc = (AbstractDocument) getDocument();
doc.setDocumentFilter(new TextLimiter(maxLength));
}
/**
* Text limiter used to limit the number of characters of text fields
* Should be used this way :
*
* AbstractDocument doc = (AbstractDocument) myTextComponent.getDocument();
doc.setDocumentFilter(new TextLimiter(maxLength));
*
* @author oma
*
*/
private class TextLimiter extends DocumentFilter {
private int max;
public TextLimiter(int max) {
this.max = max;
}
public void insertString(DocumentFilter.FilterBypass fb, int offset, String str, AttributeSet attr) throws BadLocationException {
replace(fb, offset, 0, str, attr);
}
public void replace(DocumentFilter.FilterBypass fb, int offset, int length, String str, AttributeSet attrs) throws BadLocationException {
int newLength = fb.getDocument().getLength() - length + str.length();
if (newLength <= max) {
fb.replace(offset, length, str, attrs);
} else {
Toolkit.getDefaultToolkit().beep();
}
}
}
} |
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