Highlight JTextField the given label from the first mouse event to the second Returns true if the highlight was successful, false otherwise. - Java Swing

Java examples for Swing:Mouse Event

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Description

Highlight JTextField the given label from the first mouse event to the second Returns true if the highlight was successful, false otherwise.

Demo Code


//package com.java2s;
import java.awt.Color;
import java.awt.FontMetrics;
import java.awt.event.MouseEvent;
import javax.swing.JTextField;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultHighlighter;

public class Main {
    /**/*from  ww  w . j av a 2  s . c  o m*/
     * Highlight the given label from the first mouse event to the second
     * Returns true if the highlight was successful, false otherwise.
     */
    public static boolean addHighlight(JTextField label,
            MouseEvent mouseEvent1, MouseEvent mouseEvent2) {
        FontMetrics fm = label.getFontMetrics(label.getFont());
        int firstXpos = mouseEvent1.getX();
        int lastXpos = mouseEvent2.getX();
        int firstOffset = getCharOffset(fm, label.getText(), firstXpos);
        int lastOffset = getCharOffset(fm, label.getText(), lastXpos);
        if (lastOffset != firstOffset) {
            if (firstOffset > lastOffset) {
                int tmp = firstOffset;
                firstOffset = lastOffset;
                lastOffset = tmp;
            }
            try {
                label.getHighlighter().removeAllHighlights();
                label.getHighlighter().addHighlight(
                        firstOffset,
                        lastOffset,
                        new DefaultHighlighter.DefaultHighlightPainter(
                                Color.yellow));
                return true;
            } catch (BadLocationException e1) {
                return false;
            }
        } else
            return false;
    }

    private static int getCharOffset(FontMetrics fm, String characters,
            int xPos) {
        StringBuilder s = new StringBuilder();
        char[] sArray = characters.toCharArray();
        int i;
        for (i = 0; i < characters.length()
                && fm.stringWidth(s.toString()) < xPos; i++) {
            s.append(sArray[i]);
        }
        return i;
    }
}

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