Returns true if the given mouse event occurred within a highlight on label. - Java Swing

Java examples for Swing:Mouse Event

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Description

Returns true if the given mouse event occurred within a highlight on label.

Demo Code


//package com.java2s;

import java.awt.FontMetrics;
import java.awt.event.MouseEvent;
import javax.swing.JTextField;

import javax.swing.text.Highlighter;
import javax.swing.text.Highlighter.Highlight;

public class Main {
    /**//from  w  w w.j  av a2 s  .c o m
     * Returns true if the given mouse event occurred within a highlight h on label.
     */
    public static boolean isInHighlight(MouseEvent e, JTextField label,
            Highlighter h) {
        Highlight[] hls = h.getHighlights();
        if (hls == null || hls.length == 0)
            return false;
        Highlight hl = hls[0];
        FontMetrics fm = label.getFontMetrics(label.getFont());
        int offset = getCharOffset(fm, label.getText(), e.getX());
        return hl.getStartOffset() <= offset && offset < hl.getEndOffset();
    }

    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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