GlassPane.java

package com.floreantpos.swing;

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;

import javax.swing.JLabel;
import javax.swing.JPanel;

public class GlassPane extends JPanel implements MouseListener, MouseMotionListener {
	private float opacity = 0.2f;
	private JLabel label;
	
	public GlassPane(){
		setOpaque(false);
		setVisible(false);
		
		setLayout(new GridLayout());
		label = new JLabel("LOADING");
		label.setHorizontalAlignment(JLabel.CENTER);
		label.setVerticalAlignment(JLabel.CENTER);
		label.setFont(getFont().deriveFont(Font.BOLD, 48));
		label.setForeground(Color.RED);
		add(label);
		
		addMouseListener(this);
		addMouseMotionListener(this);
		setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
	}
	
	@Override
	protected void paintComponent(Graphics g) {
		super.paintComponent(g);
		
		Graphics2D g2 = (Graphics2D) g;
		AlphaComposite ac = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, opacity);
		g2.setComposite(ac);
		g.fillRect(0, 0, getWidth(), getHeight());
	}

	public void mouseClicked(MouseEvent e) {
	}

	public void mousePressed(MouseEvent e) {
	}

	public void mouseReleased(MouseEvent e) {
	}

	public void mouseEntered(MouseEvent e) {
	}

	public void mouseExited(MouseEvent e) {
	}

	public void mouseDragged(MouseEvent e) {
	}

	public void mouseMoved(MouseEvent e) {
	}

	public float getOpacity() {
		return opacity;
	}

	public void setOpacity(float opacity) {
		this.opacity = opacity;
	}
	
	public void setMessage(String message) {
		label.setText(message);
	}
}