/**
  * Class which implements an applet which displays the color selected
  * using three scrollbars.  It illustrates the use of "listeners"
  * Written by Kim Bruce, 10/3/99
  */

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class ColorMixer implements ActionListener {

	// JLabels for color controlled by each of three scrollbars
	private JLabel redJLabel = new JLabel("Red", JLabel.RIGHT);
	private JLabel blueJLabel = new JLabel(" Blue", JLabel.RIGHT);
	private JLabel greenJLabel = new JLabel("Green", JLabel.RIGHT);

	// JLabels to display current value of each scrollbar
	private JTextField redValueField = new JTextField("0", 3);
	private JTextField greenValueField = new JTextField("0", 3);
	private JTextField blueValueField = new JTextField("0", 3);

	// The panel where the mixed color is displayed.
	private ColorPanel colorPanel;

	// Set up Scrollbars and JLabels on panels
	public ColorMixer() {
		// Create the window
		JFrame frame = new JFrame();
		frame.setSize (new Dimension (300, 200));
		
		// Set up panel to hold three text fields and their JLabels
		JPanel selectorPanel = new JPanel();

		// We want the JLabels and text fields to be next to each other, so use a GridLayout
		// This gives us:
		//    3 rows, one for each color
		//    2 columns, one for the JLabel, one for the text field
		//    10 pixels between the JLabel and text field
		//    5 pixels beween rows
		selectorPanel.setLayout(new GridLayout(3, 2, 10, 5));

		// Set up the JLabels and text fields
		selectorPanel.add(redJLabel);
		selectorPanel.add(redValueField);

		selectorPanel.add(blueJLabel);
		selectorPanel.add(blueValueField);

		selectorPanel.add(greenJLabel);
		selectorPanel.add(greenValueField);

		// Add listeners to the fields so we know when the user changes the value.
		redValueField.addActionListener(this);
		blueValueField.addActionListener(this);
		greenValueField.addActionListener(this);

		// Add panel to content pane of window
		Container contentPane = frame.getContentPane();
		contentPane.add(selectorPanel, BorderLayout.SOUTH);

		colorPanel = new ColorPanel();
		contentPane.add(colorPanel, BorderLayout.CENTER);
		frame.setVisible(true);
	}


	public void actionPerformed(ActionEvent evt) {
		try {
			// get component color values
			int redValue = Integer.parseInt(redValueField.getText());
			int greenValue = Integer.parseInt(greenValueField.getText());
			int blueValue = Integer.parseInt(blueValueField.getText());

			// Create the new color and make it the color for colorRect
			colorPanel.setColor (new Color(redValue, greenValue, blueValue));
			colorPanel.repaint();
		} catch (NumberFormatException e) {
			JOptionPane.showMessageDialog(
				colorPanel,
				"Enter only numbers: " + e.getMessage());
		} catch (IllegalArgumentException e) {
			JOptionPane.showMessageDialog(
				colorPanel,
				"Enter only 0..255: " + e.getMessage());
		}

	}
	
	public static void main (String[] args) {
		new ColorMixer();
	}
}