/**
 * @author Igor Kholodov, Bristol Community College
 *
 * <code>application</code> package is a namespace for the classes
 * of the application.
 */
package application;

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

/**
 * <code>FrameRadioButtons</code> is the demo class for UI window
 * with two buttons.
 */
public class FrameRadioButtons extends FrameApplication implements ActionListener
{
    // ----- Data Attributes ----------
    JButton mButChangeColor; // Button that changes background color
    JButton mButQuit;        // Quit button
    JPanel mMainPanel;
    GroupRadioButtons mRadioPanel;
    Color mSystemColor;

    // ----- Operations ----------
    /** 
    * Class constructor takes care of all basic setup steps.
    */
    public FrameRadioButtons(String aCaption)
    {
        super(aCaption);
        setGridLayout();
        this.setVisible(true);
    } // method: FrameRadioButtons

    /** 
    * Confugures user interface components
    */
    private void setGridLayout()
    {
        // Two panels
        mMainPanel = new JPanel();
        mRadioPanel = new GroupRadioButtons(this);

        // push buttons
        mButChangeColor = new JButton("Change Color");
        mButQuit = new JButton("Quit");
        mButChangeColor.addActionListener(this);
        mButQuit.addActionListener(this);

        mMainPanel.add(new JLabel("Click the color button twice to see the effect:"));
        mMainPanel.add(mButChangeColor);
        mMainPanel.add(mButQuit);
        mSystemColor = mMainPanel.getBackground();

        // Use grid with 2 rows and one column:
        this.setLayout(new GridLayout(2, 1));
        this.getContentPane().add(mRadioPanel);
        this.getContentPane().add(mMainPanel);
        this.pack();

    } // method: setGridLayout

    /** 
    * Handles user clicks
    */
    public void actionPerformed(ActionEvent event)
    {
        Object obj = event.getSource();
        if (obj == mButChangeColor)
            switchColors();
        if (obj == mButQuit)
            System.exit(0);
    } // method: actionPerformed

    /** 
    * Switches background color from original to green and back
    */
    private void switchColors()
    {

        if (mSystemColor == mMainPanel.getBackground())
        {
            mMainPanel.setBackground(mRadioPanel.getColor());
        }
        else
        {
            mMainPanel.setBackground(mSystemColor);
        }

        this.repaint();
    } // method: switchColors

} // class: FrameRadioButtons