/*
This applet demonstrates four easy-to-use routines for
showing a dialog box and, in three cases, getting back
some information from the user. The methods are:
JOptionPane.showMessageDialog
JOptionPane.showConfirmDialog
JOptionPane.showInputDialog
JColorChooser.showDialog
*/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class SimpleDialogDemo extends JApplet implements ActionListener {
JLabel message; // A label for giving some feedback to the user.
// It appears at the top of the applet.
Color selectedColor = Color.gray; // This color will be used as the
// initial color in the color chooser.
// It is used to rememeber the user's
// color choice, so that the color
// chooser can show the same color,
// if it is opened twice.
public **** init() {
// Set up the applet with a message label and four buttons.
// Each button will open a different type of dialog.
setBackground(Color.gray);
getContentPane().setBackground(Color.gray);
getContentPane().setLayout( new GridLayout(3,1,3,3) );
message = new JLabel("Click a button to open a dialog", JLabel.CENTER);
message.setForeground(new Color(180,0,0));
message.setBackground(Color.white);
message.setOpaque(true);
getContentPane().add(message);
JPanel buttonBar;
JButton button;
buttonBar = new JPanel();
buttonBar.setLayout(new GridLayout(1,2,3,3));
buttonBar.setBackground(Color.gray);
getContentPane().add(buttonBar);
button = new JButton("Message Dialog");
button.addActionListener(this);
buttonBar.add(button);
button = new JButton("Confirm Dialog");
button.addActionListener(this);
buttonBar.add(button);
buttonBar = new JPanel();
buttonBar.setLayout(new GridLayout(1,2,3,3));
buttonBar.setBackground(Color.gray);
getContentPane().add(buttonBar);
button = new JButton("Input Dialog");
button.addActionListener(this);
buttonBar.add(button);
button = new JButton("Color Chooser");
button.addActionListener(this);
buttonBar.add(button);
} // end init()
public Insets getInsets() {
// Leave a gray border around the applet.
return new Insets(3,3,3,3);
}
public **** actionPerformed(ActionEvent evt) {
// Respond to a button click by showing a dialog
// and setting the message label to describe the
// user's response.
String command = evt.getActionCommand();
if (command.equals("Message Dialog")) {
message.setText("Displaying message dialog.");
JOptionPane.showMessageDialog(null,
"This is an example of JOptionPane.showMessageDialog.");
message.setText("You closed the message dialog.");
}
else if (command.equals("Confirm Dialog")) {
message.setText("Displaying confirm dialog.");
int response = JOptionPane.showConfirmDialog(null,
"This is an example of JOptioPane.showConfirmDialog.\n"
+ "Click any button to indicate your response.");
switch(response) {
case JOptionPane.YES_OPTION:
message.setText("You clicked \"Yes\".");
break;
case JOptionPane.NO_OPTION:
message.setText("You clicked \"No\".");
break;
case JOptionPane.CANCEL_OPTION:
message.setText("You clicked \"Cancel\".");
break;
case JOptionPane.CLOSED_OPTION:
message.setText("You closed the box without making a selection.");
}
}
else if (command.equals("Input Dialog")) {
message.setText("Displaying input dialog.");
String response = JOptionPane.showInputDialog(null,
"This is an example of JOptioPane.showInputDialog.\n"
+ "Type your response, and click a button.");
if (response == null)
message.setText("You canceled the input.");
else if (response.trim().length() == 0)
message.setText("You left the input box empty.");
else
message.setText("You entered \"" + response + "\".");
}
else if (command.equals("Color Chooser")) {
message.setText("Displaying color chooser dialog.");
Color c = JColorChooser.showDialog(null,"Select a Color",selectedColor);
if (c == null)
message.setText("You canceled without selecting a color.");
else {
selectedColor = c; // Remember selected color for next time.
int r = c.getRed();
int g = c.getGreen();
int b = c.getBlue();
message.setText("You selected RGB = (" + r + "," + g + "," + b + ").");
}
}
} // end actionPerformed()
} // end class SimpleDialogDemo
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