// Valuator.java
// A class that provides a combination of a scroll bar, text field,
// label, and listeners for these.
// S. Tanimoto, 1 Feb. 2000

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

public class Valuator extends Panel {

    Scrollbar sb;
    TextField tf;
    int theValue;


    Valuator(String name, int initialValue, int maxVal, Color bgColor) {
	setBackground(bgColor);
	sb = new Scrollbar(Scrollbar.VERTICAL, 0, 10, 0, maxVal);
	sb.setSize(10,300);
	sb.addAdjustmentListener(new SBHandler());
	tf = new TextField(5);
	tf.addActionListener(new TFHandler());

        GridBagLayout gbl = new GridBagLayout();
	GridBagConstraints gbc = new GridBagConstraints();
        setLayout(gbl);

        gbc.gridx = 1; gbc.gridy = 1; gbc.gridwidth = 2;
	Label l1 = new Label(name);
        gbl.setConstraints(l1, gbc);
        add(l1);

        gbc.gridx = 1; gbc.gridy = 2; gbc.gridwidth = 1;
        gbl.setConstraints(sb, gbc);
        add(sb);

        gbc.gridx = 2; gbc.gridy = 2; gbc.gridwidth = 1;
        gbl.setConstraints(tf, gbc);
        add(tf);

	theValue = initialValue;
	tf.setText(theValue + "");
    }

    public int getValue() { return theValue; }

    class SBHandler implements AdjustmentListener {
	public void adjustmentValueChanged(AdjustmentEvent e) {
	    theValue = e.getValue();
	    tf.setText(theValue + "");
	}
    }
    class TFHandler implements ActionListener {
	public void actionPerformed(ActionEvent e) {
	    theValue = (new Integer(tf.getText())).intValue();
	    sb.setValue(theValue);
	}
    }
}