TopButtonPanel.java

Back to Into Java - Part XVI

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;

public class TopButtonPanel extends JPanel
                            implements ActionListener {

    private PaintBox owner;
    private JButton lineButton;
    private JButton rectButton;
    private JButton ovalButton;
    private JButton filledButton;
    private JLabel shape;
    private boolean filled = true;

    public TopButtonPanel (PaintBox o) {
        owner = o;
        setLayout(new GridLayout(1, 5));

        lineButton = new JButton("Line");
        lineButton.addActionListener(this);
        add(lineButton);

        rectButton = new JButton("Rectangle");
        rectButton.addActionListener(this);
        add(rectButton);

        ovalButton = new JButton("Oval");
        ovalButton.addActionListener(this);
        add(ovalButton);

        filledButton = new JButton("Filled");
        filledButton.addActionListener(this);
        add(filledButton);

        shape = new JLabel("   Rectangle");
        shape.setBackground(Color.white);
        shape.setForeground(Color.black);
        shape.setOpaque(true);
        shape.setBorder(BorderFactory.createBevelBorder(
            BevelBorder.LOWERED));
        add(shape);
    }

    public void actionPerformed(ActionEvent e) {
        Object obj = e.getSource();

        if (obj == filledButton) {
            if (filled) { // filled true
                filled = false;
                owner.setFilled(filled);
                filledButton.setText("Not filled");
            } else {
                filled = true;
                owner.setFilled(filled);
                filledButton.setText("Filled");
            }
        /* constants found in PaintPanel are used*/
        } else if (obj == lineButton) {
            owner.setShape(PaintPanel.LINE);
            shape.setText("   Line");
        } else if (obj == rectButton) {
            owner.setShape(PaintPanel.RECTANGLE);
            shape.setText("   Rectangle");
        } else { // must be ovalButton
            owner.setShape(PaintPanel.OVAL);
            shape.setText("   Oval");
        }
    }
}