Java Swing How to - Set custom label for JSlider

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Question

We would like to know how to set custom label for JSlider.

Answer

//from   w ww . ja  v  a  2 s . com
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Polygon;
import java.util.Hashtable;

import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JSlider;

public class Main {
    public static void main(String args[]) {
        String title = (args.length == 0 ? "Sample Slider" : args[0]);
        JFrame f = new JFrame(title);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JSlider js1 = new JSlider();
        js1.putClientProperty("JSlider.isFilled", Boolean.TRUE);
        JSlider js2 = new JSlider();
        js2.setMajorTickSpacing(25);
        js2.setPaintTicks(true);
        js2.setSnapToTicks(true);
        JSlider js3 = new JSlider(JSlider.VERTICAL);
        js3.setPaintTrack(false);
        js3.setMinorTickSpacing(5);
        js3.setMajorTickSpacing(10);
        js3.setPaintTicks(true);
        js3.setPaintLabels(true);
        js3.setSnapToTicks(true);
        JSlider js4 = new JSlider(JSlider.VERTICAL);
        Hashtable table = new Hashtable();
        table.put(new Integer(0), new JLabel(new DiamondIcon(Color.red)));
        table.put(new Integer(10), new JLabel("Ten"));
        table.put(new Integer(25), new JLabel("Twenty-Five"));
        table.put(new Integer(34), new JLabel("Thirty-Four"));
        table.put(new Integer(52), new JLabel("Fifty-Two"));
        table.put(new Integer(70), new JLabel("Seventy"));
        table.put(new Integer(82), new JLabel("Eighty-Two"));
        table.put(new Integer(100), new JLabel(new DiamondIcon(Color.black)));
        js4.setLabelTable(table);
        js4.setPaintLabels(true);
        js4.setSnapToTicks(true);
        Container c = f.getContentPane();
        c.add(js1, BorderLayout.NORTH);
        c.add(js2, BorderLayout.SOUTH);
        c.add(js3, BorderLayout.WEST);
        c.add(js4, BorderLayout.EAST);
        f.setSize(300, 200);
        f.setVisible(true);
    }
}

class DiamondIcon implements Icon {
    private Color color;

    private boolean selected;

    private int width;

    private int height;

    private Polygon poly;

    private static final int DEFAULT_WIDTH = 10;

    private static final int DEFAULT_HEIGHT = 10;

    public DiamondIcon(Color color) {
        this(color, true, DEFAULT_WIDTH, DEFAULT_HEIGHT);
    }

    public DiamondIcon(Color color, boolean selected) {
        this(color, selected, DEFAULT_WIDTH, DEFAULT_HEIGHT);
    }

    public DiamondIcon(Color color, boolean selected, int width, int height) {
        this.color = color;
        this.selected = selected;
        this.width = width;
        this.height = height;
        initPolygon();
    }

    private void initPolygon() {
        poly = new Polygon();
        int halfWidth = width / 2;
        int halfHeight = height / 2;
        poly.addPoint(0, halfHeight);
        poly.addPoint(halfWidth, 0);
        poly.addPoint(width, halfHeight);
        poly.addPoint(halfWidth, height);
    }

    public int getIconHeight() {
        return height;
    }

    public int getIconWidth() {
        return width;
    }

    public void paintIcon(Component c, Graphics g, int x, int y) {
        g.setColor(color);
        g.translate(x, y);
        if (selected) {
            g.fillPolygon(poly);
        } else {
            g.drawPolygon(poly);
        }
        g.translate(-x, -y);
    }
}

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