package Nodepad;

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

/**
 * ButtonPanel.java
 *
 *
 * Created: Tue Dec 24 13:43:52 2002
 *
 * @author <a href="mailto:shapiro@cse.buffalo.edu">Stuart C. Shapiro</a>
 * @version
 *
 * A panel of buttons for a NodePad.
 *
 */

public class ButtonPanel extends JPanel
    implements ActionListener {

    Pad pad; // The sketchpad controlled by these buttons.
    int initVal; // The integer value to be given to the next node created.
    JTextField initReg; // Contains initVal as a string.
    JRadioButton moveButton, transferButton; // To select the action.

    /**
     * Creates a button panel to control a node sketchpad.
     *
     * @param p the Pad controlled by these buttons.
     */
    public ButtonPanel (Pad p){
	pad = p;

	ButtonGroup group = new ButtonGroup();

	/*
	 * If the transferButton is selected,
	 * mouse dragging moves a value from one node to another.
	 */
	transferButton = new JRadioButton("Transfer");
	{Font currFont = transferButton.getFont();
	transferButton.setFont(currFont.deriveFont(2*currFont.getSize2D()));}
	group.add(transferButton);
	add(transferButton);

	/*
	 * if the moveButton is selected,
	 * mouse dragging moves a node.
	 */
	moveButton = new JRadioButton("Move");
	{Font currFont = moveButton.getFont();
	moveButton.setFont(currFont.deriveFont(2*currFont.getSize2D()));}
	moveButton.setSelected(true);
	group.add(moveButton);
	add(moveButton);

	JLabel label = new JLabel("Initial value:", JLabel.RIGHT);
	{Font currFont = label.getFont();
	label.setFont(currFont.deriveFont(2*currFont.getSize2D()));}
	add(label);

	// A text field for setting the value of the next node.
	initVal = (int)(Math.random()*1000);
	initReg=new JTextField(""+initVal, 4);
	{Font currFont = initReg.getFont();
	initReg.setFont(currFont.deriveFont(2*currFont.getSize2D()));}
	initReg.selectAll();
	initReg.addActionListener(this);
	add(initReg);

	moveButton.addItemListener(new ItemListener() {
		// Sets the state to node moving.
		public void itemStateChanged(ItemEvent event){
		    if (moveButton.isSelected()) {
			pad.setMovingNodes(true);
		    } // end of if (moveButton.isSelected())
		}
	    }
				   );
	transferButton.addItemListener(new ItemListener() {
		// Sets the state to node value transfer.
		public void itemStateChanged(ItemEvent event){
		    if (transferButton.isSelected()) {
			pad.setMovingNodes(false);
		    } // end of if (transferButton.isSelected())
		}
	    }
				       );
    }

    /**
     * Makes the transferButton the selected one.
     *
     */
    public void selectTransfer () {
	transferButton.setSelected(true);
    }

    /**
     * Adds a new node to the Pad controlled by this ButtonPanel.
     * The value of the new node is the integer entered into the JTextField.
     * That int must be in the range [-999, 9999].
     * If not, no node is created,
     *  and the text is returned to its previous value.
     *
     * @param evt the ActionEvent of pressing CR in the JTextField.
     */
    public void actionPerformed(ActionEvent evt) {
	int newVal = initVal;
	try {
	    newVal = Integer.parseInt(initReg.getText());
	    if (newVal<-999 || newVal>9999) {
		throw(new NumberFormatException());
	    }
	    initVal = newVal;    
	    Node nde = new Node(pad,2,2,initVal);
	    pad.add(nde);
	    pad.repaint(nde.getBounds());
	} catch (Exception e) {
	    initReg.setText(""+initVal);
	    Toolkit.getDefaultToolkit().beep();
	} // end of try-catch
        initReg.selectAll();
    }

}// ButtonPanel