Gets the line index which contains specified offset in JTextComponent. - Java Swing

Java examples for Swing:JTextComponent

  1. HOME
  2. Java
  3. Swing
  4. JTextComponent

Description

Gets the line index which contains specified offset in JTextComponent.

Demo Code


//package com.java2s;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.Element;
import javax.swing.text.JTextComponent;

public class Main {
    /**//ww w. j  av a  2  s  .c o m
     * Gets the line index which contains specified offset.
     * @param comp
     * @param offset
     * @return
     * @throws BadLocationException 
     */
    public static int getLineOfOffset(JTextComponent comp, int offset)
            throws BadLocationException {
        Document doc = comp.getDocument();
        if (offset < 0) {
            throw new BadLocationException(
                    "Can't translate offset to line", -1);
        } else if (offset > doc.getLength()) {
            throw new BadLocationException(
                    "Can't translate offset to line", doc.getLength() + 1);
        } else {
            Element map = doc.getDefaultRootElement();
            return map.getElementIndex(offset);
        }
    }
}

Related Tutorials