import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Insets;
import javax.swing.AbstractButton;
import javax.swing.ButtonModel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.border.AbstractBorder;
import javax.swing.border.Border;
public class RedGreenBorder extends AbstractBorder {
public boolean isBorderOpaque() {
return true;
}
public Insets getBorderInsets(Component c) {
return new Insets(3, 3, 3, 3);
}
public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
Insets insets = getBorderInsets(c);
Color horizontalColor;
if (c.isEnabled()) {
boolean pressed = false;
if (c instanceof AbstractButton) {
ButtonModel model = ((AbstractButton) c).getModel();
pressed = model.isPressed();
}
if (pressed) {
horizontalColor = Color.RED;
} else {
horizontalColor = Color.GREEN;
}
} else {
horizontalColor = Color.LIGHT_GRAY;
}
g.setColor(horizontalColor);
g.fillRect(0, 0, width, insets.top);
}
public static void main(String args[]) {
JFrame frame = new JFrame("My Border");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Border border = new RedGreenBorder();
JButton helloButton = new JButton("Hello");
helloButton.setBorder(border);
JButton braveButton = new JButton("Brave New");
braveButton.setBorder(border);
braveButton.setEnabled(false);
JButton worldButton = new JButton("World");
worldButton.setBorder(border);
Container contentPane = frame.getContentPane();
contentPane.add(helloButton, BorderLayout.NORTH);
contentPane.add(braveButton, BorderLayout.CENTER);
contentPane.add(worldButton, BorderLayout.SOUTH);
frame.setSize(300, 100);
frame.setVisible(true);
}
}