Sketch : Various Event Listener « Event « Java


Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly 
//A sketching application with two dials: one for horizontal movement, one
//for vertical movement. The dials are instances of the JogShuttle class.

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.BoundedRangeModel;
import javax.swing.DefaultBoundedRangeModel;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.border.BevelBorder;
import javax.swing.border.LineBorder;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.plaf.ComponentUI;

public class Sketch extends JPanel implements PropertyChangeListener,
    ActionListener {
  JogShuttle shuttle1;

  JogShuttle shuttle2;

  JPanel board;

  JButton clear;

  int lastX, lastY; // Keep track of the last point we drew.

  public Sketch() {

    setLayout(new BorderLayout());
    board = new JPanel(true);
    board.setPreferredSize(new Dimension(300, 300));
    board.setBorder(new LineBorder(, 5));

    clear = new JButton("Clear Drawing Area");

    shuttle1 = new JogShuttle(0, 300, 150);
    lastX = shuttle1.getValue();
    shuttle2 = new JogShuttle(0, 300, 150);
    lastY = shuttle2.getValue();



    shuttle1.setBorder(new BevelBorder(BevelBorder.RAISED));
    shuttle2.setBorder(new BevelBorder(BevelBorder.RAISED));

    add(board, BorderLayout.NORTH);
    add(shuttle1, BorderLayout.WEST);
    add(clear, BorderLayout.CENTER);
    add(shuttle2, BorderLayout.EAST);

  public void propertyChange(PropertyChangeEvent e) {
    if (e.getPropertyName() == "value") {
      Graphics g = board.getGraphics();
      g.drawLine(lastX, lastY, shuttle1.getValue(), shuttle2.getValue());
      lastX = shuttle1.getValue();
      lastY = shuttle2.getValue();

  public void actionPerformed(ActionEvent e) {
    //  The button must have been pressed.
    Insets insets = board.getInsets();
    Graphics g = board.getGraphics();
    g.fillRect(insets.left,, board.getWidth() - insets.left
        - insets.right, board.getHeight() - - insets.bottom);

  public static void main(String[] args) {
    UIManager.put(JogShuttleUI.UI_CLASS_ID, "BasicJogShuttleUI");
    Sketch s = new Sketch();
    JFrame frame = new JFrame("Sample Sketch Application");

//A custom jog shuttle component. (Some VCRs have such a thing for doing
//variable speed fast-forward and fast-reverse.) An example of using the
//JogShuttle can be found in

class JogShuttle extends JComponent implements ChangeListener {

  private BoundedRangeModel model;

  //  The dialInsets property tells how far the dial is inset
  //  from the sunken border.
  private Insets dialInsets = new Insets(3, 3, 3, 3);

  //  The valuePerRevolution property tells how many units the dial
  //  takes to make a complete revolution.
  private int valuePerRevolution;

  //  Constructors
  public JogShuttle() {
    init(new DefaultBoundedRangeModel());

  public JogShuttle(BoundedRangeModel m) {

  public JogShuttle(int min, int max, int value) {
    init(new DefaultBoundedRangeModel(value, 1, min, max));

  protected void init(BoundedRangeModel m) {
    valuePerRevolution = m.getMaximum() - m.getMinimum();
    setMinimumSize(new Dimension(80, 80));
    setPreferredSize(new Dimension(80, 80));

  public void setUI(JogShuttleUI ui) {

  public void updateUI() {
    setUI((JogShuttleUI) UIManager.getUI(this));

  public String getUIClassID() {
    return JogShuttleUI.UI_CLASS_ID;

  public void setModel(BoundedRangeModel m) {
    BoundedRangeModel old = model;
    if (old != null)

    if (m == null)
      model = new DefaultBoundedRangeModel();
      model = m;

    firePropertyChange("model", old, model);

  public BoundedRangeModel getModel() {
    return model;

  //  Methods
  public void resetToMinimum() {

  public void resetToMaximum() {

  public void stateChanged(ChangeEvent e) {

  //  Accessors and mutators
  public int getMinimum() {
    return model.getMinimum();

  public void setMinimum(int m) {
    int old = getMinimum();
    if (m != old) {
      firePropertyChange("minimum", old, m);

  public int getMaximum() {
    return model.getMaximum();

  public void setMaximum(int m) {
    int old = getMaximum();
    if (m != old) {
      firePropertyChange("maximum", old, m);

  public int getValue() {
    return model.getValue();

  public void setValue(int v) {
    int old = getValue();
    if (v != old) {
      firePropertyChange("value", old, v);

  //  Display-specific properties
  public int getValuePerRevolution() {
    return valuePerRevolution;

  public void setValuePerRevolution(int v) {
    int old = getValuePerRevolution();
    if (v != old) {
      valuePerRevolution = v;
      firePropertyChange("valuePerRevolution", old, v);

  public void setDialInsets(Insets i) {
    dialInsets = i;

  public void setDialInsets(int top, int left, int bottom, int right) {
    dialInsets = new Insets(top, left, bottom, right);

  public Insets getDialInsets() {
    return dialInsets;

//Fill out the proper UIClassID information for our JogShuttle.

abstract class JogShuttleUI extends ComponentUI {
  public static final String UI_CLASS_ID = "JogShuttleUI";


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