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*
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*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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package javademo.swing.text.TextComponentDemo;
/* A 1.4 class used by TextComponentDemo.java. */
import java.awt.Toolkit;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DocumentFilter;
public class DocumentSizeFilter extends DocumentFilter
{
int maxCharacters;
boolean DEBUG = false;
public DocumentSizeFilter(int maxChars)
{
maxCharacters = maxChars;
}
public void insertString(FilterBypass fb, int offs, String str, AttributeSet a)
throws BadLocationException
{
if (DEBUG)
{
System.out.println("in DocumentSizeFilter's insertString method");
}
// This rejects the entire insertion if it would make
// the contents too long. Another option would be
// to truncate the inserted string so the contents
// would be exactly maxCharacters in length.
if ((fb.getDocument().getLength() + str.length()) <= maxCharacters)
super.insertString(fb, offs, str, a);
else
Toolkit.getDefaultToolkit().beep();
}
public void replace(FilterBypass fb, int offs, int length, String str, AttributeSet a)
throws BadLocationException
{
if (DEBUG)
{
System.out.println("in DocumentSizeFilter's replace method");
}
// This rejects the entire replacement if it would make
// the contents too long. Another option would be
// to truncate the replacement string so the contents
// would be exactly maxCharacters in length.
if ((fb.getDocument().getLength() + str.length() - length) <= maxCharacters)
super.replace(fb, offs, length, str, a);
else
Toolkit.getDefaultToolkit().beep();
}
}