File : TMyButton.java
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package tmybutton;
import javax.swing.*;
import javax.swing.plaf.*;
import java.awt.*;
import java.awt.event.*;
// 11. The component class MyButton is a subclass of JComponent.
class MyButton extends JComponent {
MyButtonModel model = null;
String text = "";
Font font = null;
FontMetrics fontMetrics = null;
int border = 10;
boolean buttonPressed = false;
// 12. MyButton constructor without any arguments.
public MyButton() {
this(null);
}
// 13. MyButton constructor that takes the text label argument.
public MyButton(String text) {
// Assign the data model to the component.
setModel(new DefaultMyButtonModel());
// Initialize the text label.
this.text = text;
// Obtain the default font.
font = getFont();
// If there is no default font, assign a new font.
if (font == null) {
font = new Font("SanSerif", Font.BOLD, 14);
}
// Retrieve the font metrics of the font.
fontMetrics = getFontMetrics(font);
// Register a mouse listener.
addMouseListener(new ButtonMouseListener());
// Update the view of the button.
updateUI();
}
// 14. Method definition of update.
public void updateUI() {
// Assign proper look-and-feel for the view depending on the
// specified look-and-feel.
if (MyUIManager.getLookAndFeel().equals("Default")) {
super.setUI(new MyButtonUI());
}
else if (MyUIManager.getLookAndFeel().equals("Oval")) {
super.setUI(new MyButtonOvalUI());
}
}
// 15. This class is the UI delegate. It has been defined as an
// inner class to simplify the program. This class provides the default
// view of the button.
class MyButtonUI extends ComponentUI {
// 16. Constructor.
public MyButtonUI() {
repaint(); // Call repaint for further actions.
}
// 17. Retrieve the minimum size of the component.
public Dimension getMinimumSize() {
int w = fontMetrics.stringWidth(text);
int h = fontMetrics.getHeight();
return new Dimension(w+2*border, h+2*border);
}
// 18. Retrieve the preferred size of the component.
public Dimension getPreferredSize() {
return getMinimumSize();
}
// 19. Retrieve the maximum size of the component.
public Dimension getMaximumSize() {
return new Dimension(Short.MAX_VALUE, Short.MAX_VALUE);
}
// 20. The update method definition.
public void update(Graphics g, JComponent c) {
if (c.isOpaque()) {
g.setColor(c.getBackground());
g.fillRect(0,0,getWidth(), getHeight());
}
paint(g, c);
}
// 21. The paint method definition.
public void paint(Graphics g, JComponent c) {
g.setFont(font);
if (buttonPressed == false) {
buttonView(g, Color.lightGray, Color.black);
}
else {
buttonView(g, Color.gray, Color.white);
}
}
// 22. The buttonView method definition.
public void buttonView(Graphics g, Color background, Color foreground) {
g.setColor(background);
g.fill3DRect(0,0, getSize().width, getSize().height, true);
g.setColor(foreground);
int x = (getSize().width-fontMetrics.stringWidth(text))/2;
int y = (getSize().height+fontMetrics.getHeight()
-fontMetrics.getDescent())/2;
g.drawString(text, x, y);
}
}
// 23. Implementation of oval shaped look-and-feel for MyButton.
// This view of the button is used as an alternative to its default view.
class MyButtonOvalUI extends ComponentUI {
// 24. Constructor.
public MyButtonOvalUI() {
repaint();
}
// 25. Retrieve the minimum size of the component.
public Dimension getMinimumSize() {
int w = fontMetrics.stringWidth(text);
int h = fontMetrics.getHeight();
return new Dimension(w+2*border, h+2*border);
}
// 26. Retrieve the preferred size of the component.
public Dimension getPreferredSize() {
return getMinimumSize();
}
// 27. Retrieve the maximum size of the component.
public Dimension getMaximumSize() {
return new Dimension(Short.MAX_VALUE, Short.MAX_VALUE);
}
// 28. The update method definition.
public void update(Graphics g, JComponent c) {
if (c.isOpaque()) {
g.setColor(c.getBackground());
g.fillRect(0,0,getWidth(), getHeight());
}
paint(g, c);
}
// 29. The paint method definition.
public void paint(Graphics g, JComponent c) {
g.setFont(font);
if (buttonPressed == false) {
buttonView(g, Color.gray, Color.white);
}
else {
buttonView(g, Color.lightGray, Color.black);
}
}
// 30. The button view definition.
public void buttonView(Graphics g, Color background, Color foreground) {
g.setColor(background);
g.fillOval(0,0, getSize().width, getSize().height);
g.setColor(foreground);
int x = (getSize().width-fontMetrics.stringWidth(text))/2;
int y = (getSize().height+fontMetrics.getHeight()
-fontMetrics.getDescent())/2;
g.drawString(text, x, y);
}
}
// 31. When the user presses or releases the mouse over a button,
// the functionality from the implementation methods from this
// mouse listener class are executed.
class ButtonMouseListener extends MouseAdapter {
public void mousePressed(MouseEvent evt) {
requestFocus();
buttonPressed = true;
((MyButton) evt.getSource()).repaint();
}
public void mouseReleased(MouseEvent evt) {
buttonPressed = false;
((MyButton) evt.getSource()).repaint();
ActionEvent actionEvent = new ActionEvent(
MyButton.this,
ActionEvent.ACTION_PERFORMED,
MyButton.this.getActionCommand());
processEvent(actionEvent);
}
}
//Supports the action listener.
ActionListener actionListener;
// 32. Method to register an action listener with the button.
public void addActionListener(ActionListener l) {
actionListener = AWTEventMulticaster.add(actionListener, l);
}
// 33. To figure out the action events.
protected void processEvent(AWTEvent evt) {
if (evt instanceof ActionEvent) {
processActionEvent((ActionEvent) evt);
}
else {
super.processEvent(evt);
}
}
// 34. To process the action events.
protected void processActionEvent(ActionEvent evt) {
if (actionListener != null) {
// Execute the action performed from the listener class.
actionListener.actionPerformed(evt);
}
}
// 35. Method to assign the button model.
public void setModel(MyButtonModel model) {
this.model = model;
}
// 36. Retrieve the action model.
public MyButtonModel getModel() {
return model;
}
// 37. Assign the text label to the button.
public void setText(String text) {
this.text = text;
invalidate();
repaint();
}
// 38. Retrieve the text label of the button.
public String getText() {
return text;
}
// 39. To assign the action command.
public void setActionCommand(String actionCommand) {
getModel().setActionCommand(actionCommand);
}
// 40. To retrieve the action command.
public String getActionCommand() {
String ac = getModel().getActionCommand();
if (ac == null) {
ac = getText();
}
return ac;
}
}
// 41. Define a simple button model interface.
interface MyButtonModel {
public void setActionCommand(String actionCommand);
public String getActionCommand();
}
// 42. Define the default button model class that implements the
// MyButtonModel interface.
class DefaultMyButtonModel implements MyButtonModel {
protected String actionCommand = null;
// 43. Assign an action command.
public void setActionCommand(String actionCommand) {
this.actionCommand = actionCommand;
}
// 44. Retrieve the action command that has been assigned.
public String getActionCommand() {
return actionCommand;
}
}
======================================================
File : MyUIManager.java
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package tmybutton;
class MyUIManager {
// Store the look-and-feel string.
static String lfType = "Default";
// 46. Assign a new look-and-feel.
static public void setLookAndFeel(String type) {
lfType = type;
}
// 47. Retrieve the current look-and-feel.
static public String getLookAndFeel() {
return lfType;
}
}
=========================================
File : MyButton.java
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package tmybutton;
import javax.swing.*;
import javax.swing.plaf.*;
import java.awt.*;
import java.awt.event.*;
// 11. The component class MyButton is a subclass of JComponent.
class MyButton extends JComponent {
MyButtonModel model = null;
String text = "";
Font font = null;
FontMetrics fontMetrics = null;
int border = 10;
boolean buttonPressed = false;
// 12. MyButton constructor without any arguments.
public MyButton() {
this(null);
}
// 13. MyButton constructor that takes the text label argument.
public MyButton(String text) {
// Assign the data model to the component.
setModel(new DefaultMyButtonModel());
// Initialize the text label.
this.text = text;
// Obtain the default font.
font = getFont();
// If there is no default font, assign a new font.
if (font == null) {
font = new Font("SanSerif", Font.BOLD, 14);
}
// Retrieve the font metrics of the font.
fontMetrics = getFontMetrics(font);
// Register a mouse listener.
addMouseListener(new ButtonMouseListener());
// Update the view of the button.
updateUI();
}
// 14. Method definition of update.
public void updateUI() {
// Assign proper look-and-feel for the view depending on the
// specified look-and-feel.
if (MyUIManager.getLookAndFeel().equals("Default")) {
super.setUI(new MyButtonUI());
}
else if (MyUIManager.getLookAndFeel().equals("Oval")) {
super.setUI(new MyButtonOvalUI());
}
}
// 15. This class is the UI delegate. It has been defined as an
// inner class to simplify the program. This class provides the default
// view of the button.
class MyButtonUI extends ComponentUI {
// 16. Constructor.
public MyButtonUI() {
repaint(); // Call repaint for further actions.
}
// 17. Retrieve the minimum size of the component.
public Dimension getMinimumSize() {
int w = fontMetrics.stringWidth(text);
int h = fontMetrics.getHeight();
return new Dimension(w+2*border, h+2*border);
}
// 18. Retrieve the preferred size of the component.
public Dimension getPreferredSize() {
return getMinimumSize();
}
// 19. Retrieve the maximum size of the component.
public Dimension getMaximumSize() {
return new Dimension(Short.MAX_VALUE, Short.MAX_VALUE);
}
// 20. The update method definition.
public void update(Graphics g, JComponent c) {
if (c.isOpaque()) {
g.setColor(c.getBackground());
g.fillRect(0,0,getWidth(), getHeight());
}
paint(g, c);
}
// 21. The paint method definition.
public void paint(Graphics g, JComponent c) {
g.setFont(font);
if (buttonPressed == false) {
buttonView(g, Color.lightGray, Color.black);
}
else {
buttonView(g, Color.gray, Color.white);
}
}
// 22. The buttonView method definition.
public void buttonView(Graphics g, Color background, Color foreground) {
g.setColor(background);
g.fill3DRect(0,0, getSize().width, getSize().height, true);
g.setColor(foreground);
int x = (getSize().width-fontMetrics.stringWidth(text))/2;
int y = (getSize().height+fontMetrics.getHeight()
-fontMetrics.getDescent())/2;
g.drawString(text, x, y);
}
}
// 23. Implementation of oval shaped look-and-feel for MyButton.
// This view of the button is used as an alternative to its default view.
class MyButtonOvalUI extends ComponentUI {
// 24. Constructor.
public MyButtonOvalUI() {
repaint();
}
// 25. Retrieve the minimum size of the component.
public Dimension getMinimumSize() {
int w = fontMetrics.stringWidth(text);
int h = fontMetrics.getHeight();
return new Dimension(w+2*border, h+2*border);
}
// 26. Retrieve the preferred size of the component.
public Dimension getPreferredSize() {
return getMinimumSize();
}
// 27. Retrieve the maximum size of the component.
public Dimension getMaximumSize() {
return new Dimension(Short.MAX_VALUE, Short.MAX_VALUE);
}
// 28. The update method definition.
public void update(Graphics g, JComponent c) {
if (c.isOpaque()) {
g.setColor(c.getBackground());
g.fillRect(0,0,getWidth(), getHeight());
}
paint(g, c);
}
// 29. The paint method definition.
public void paint(Graphics g, JComponent c) {
g.setFont(font);
if (buttonPressed == false) {
buttonView(g, Color.gray, Color.white);
}
else {
buttonView(g, Color.lightGray, Color.black);
}
}
// 30. The button view definition.
public void buttonView(Graphics g, Color background, Color foreground) {
g.setColor(background);
g.fillOval(0,0, getSize().width, getSize().height);
g.setColor(foreground);
int x = (getSize().width-fontMetrics.stringWidth(text))/2;
int y = (getSize().height+fontMetrics.getHeight()
-fontMetrics.getDescent())/2;
g.drawString(text, x, y);
}
}
// 31. When the user presses or releases the mouse over a button,
// the functionality from the implementation methods from this
// mouse listener class are executed.
class ButtonMouseListener extends MouseAdapter {
public void mousePressed(MouseEvent evt) {
requestFocus();
buttonPressed = true;
((MyButton) evt.getSource()).repaint();
}
public void mouseReleased(MouseEvent evt) {
buttonPressed = false;
((MyButton) evt.getSource()).repaint();
ActionEvent actionEvent = new ActionEvent(
MyButton.this,
ActionEvent.ACTION_PERFORMED,
MyButton.this.getActionCommand());
processEvent(actionEvent);
}
}
//Supports the action listener.
ActionListener actionListener;
// 32. Method to register an action listener with the button.
public void addActionListener(ActionListener l) {
actionListener = AWTEventMulticaster.add(actionListener, l);
}
// 33. To figure out the action events.
protected void processEvent(AWTEvent evt) {
if (evt instanceof ActionEvent) {
processActionEvent((ActionEvent) evt);
}
else {
super.processEvent(evt);
}
}
// 34. To process the action events.
protected void processActionEvent(ActionEvent evt) {
if (actionListener != null) {
// Execute the action performed from the listener class.
actionListener.actionPerformed(evt);
}
}
// 35. Method to assign the button model.
public void setModel(MyButtonModel model) {
this.model = model;
}
// 36. Retrieve the action model.
public MyButtonModel getModel() {
return model;
}
// 37. Assign the text label to the button.
public void setText(String text) {
this.text = text;
invalidate();
repaint();
}
// 38. Retrieve the text label of the button.
public String getText() {
return text;
}
// 39. To assign the action command.
public void setActionCommand(String actionCommand) {
getModel().setActionCommand(actionCommand);
}
// 40. To retrieve the action command.
public String getActionCommand() {
String ac = getModel().getActionCommand();
if (ac == null) {
ac = getText();
}
return ac;
}
}
// 41. Define a simple button model interface.
interface MyButtonModel {
public void setActionCommand(String actionCommand);
public String getActionCommand();
}
// 42. Define the default button model class that implements the
// MyButtonModel interface.
class DefaultMyButtonModel implements MyButtonModel {
protected String actionCommand = null;
// 43. Assign an action command.
public void setActionCommand(String actionCommand) {
this.actionCommand = actionCommand;
}
// 44. Retrieve the action command that has been assigned.
public String getActionCommand() {
return actionCommand;
}
}
