import objectdraw.*;

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

/**
 * Color Mixer that uses Exceptions to catch errors.
 */
public class ColorMixer extends WindowController implements ActionListener {
  // Labels 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);
  private FilledRect colorRect; // Rectangle displaying chosen color

  // Set up Scrollbars and labels on panels
  public void begin() {
    // We want the labels and text fields to be next to each other.
    // So use a GridLayout that gives us:
    // 3 rows, one for each color
    // 2 columns, one for the label, one for the text field
    JPanel selectorPanel = new JPanel();
    selectorPanel.setLayout(new GridLayout(3, 2));

    // Set up the labels and text fields in selectorPanel
    JLabel redLabel = new JLabel("Red", JLabel.RIGHT);
    JLabel blueLabel = new JLabel("Blue", JLabel.RIGHT);
    JLabel greenLabel = new JLabel("Green", JLabel.RIGHT);

    selectorPanel.add(redLabel);
    selectorPanel.add(redValueField);
    selectorPanel.add(blueLabel);
    selectorPanel.add(blueValueField);
    selectorPanel.add(greenLabel);
    selectorPanel.add(greenValueField);

    Container contentPane = getContentPane();
    contentPane.add(selectorPanel, "South");

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

    // create color display rectangle
    colorRect = new FilledRect(0, 0, canvas.getWidth(), canvas.getHeight(),
      canvas);

    contentPane.validate();
  }

  /*
   * This method is called whenever the user hits carriage return in a text
   * field.
   * It repaints the colorRect with the color obtained from the text field
   * values.
   */
  public void actionPerformed(ActionEvent evt) {
    try {
      // get component color values
      int red = Integer.parseInt(redValueField.getText());
      int green = Integer.parseInt(greenValueField.getText());
      int blue = Integer.parseInt(blueValueField.getText());

      // Create the new color and make it the color for colorRect
      Color newColor = new Color(red, green, blue);
      colorRect.setColor(newColor);
    } catch (Exception e) {
      JOptionPane.showMessageDialog(this, "Bad Color Input");
    }

  }
}