Option PanesCSCI 201L

Jeffrey Miller, Ph.D.

HTTP://WWW-SCF.USC.EDU/~CSCI201

USC CSCI 201L

Outline

USC CSCI 201L 2/30

▪ Option Panes▪ Program

Option Panes

▪ Option panes are popup dialog boxes▪ There are four types of option panes in Java

› Message dialog – shows a message and waits for the user to click OK

› Confirmation dialog – shows a question and asks for confirmation, such as OK or Cancel

› Input dialog – shows a question and gets the user’s input from a text field, combo box, or list

› Option dialog – shows a question and gets the user’s answer from a set of options

▪ To display an option pane, there are static methods on the JOptionPane class called showMessageDialog, showConfirmationDialog, showInputDialog, and showOptionDialog

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Message Dialog Example1 import java.awt.event.ActionEvent;2 import java.awt.event.ActionListener;34 import javax.swing.ImageIcon;5 import javax.swing.JButton;6 import javax.swing.JFrame;7 import javax.swing.JOptionPane;89 public class Test extends JFrame {10 public Test() {11 super("JOptionPane Example");12 JButton jb = new JButton("Click Here");13 jb.addActionListener(new ActionListener() {14 public void actionPerformed(ActionEvent ae) {15 JOptionPane.showMessageDialog(Test.this, 16 “Message", 17 “Message Dialog", 18 JOptionPane.INFORMATION_MESSAGE, 19 new ImageIcon("uscshield.png"));20 }21 });22 add(jb);2324 this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);25 setSize(250, 225);26 setLocationRelativeTo(null);27 setVisible(true);28 }29 30 public static void main(String args[]) {31 Test t = new Test();32 }33 }

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Message Dialog Types

JOptionPane.showMessageDialog(Test.this, "Message", "Message Dialog", JOptionPane.ERROR_MESSAGE);

JOptionPane.showMessageDialog(Test.this, "Message", "Message Dialog", JOptionPane.INFORMATION_MESSAGE);

JOptionPane.showMessageDialog(Test.this, "Message", "Message Dialog", JOptionPane.PLAIN_MESSAGE);

JOptionPane.showMessageDialog(Test.this, "Message", "Message Dialog", JOptionPane.WARNING_MESSAGE);

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JOptionPane.showMessageDialog(Test.this, "Message", "Message Dialog", JOptionPane.QUESTION_MESSAGE);

Confirmation Dialog Example1 import java.awt.event.ActionEvent;2 import java.awt.event.ActionListener;3 import javax.swing.JButton;4 import javax.swing.JFrame;5 import javax.swing.JOptionPane;67 public class Test extends JFrame {8 public Test() {9 super("JOptionPane Example");10 JButton jb = new JButton("Click Here");11 jb.addActionListener(new ActionListener() {12 public void actionPerformed(ActionEvent ae) {

13 int selection = JOptionPane.showConfirmDialog(Test.this, "Please confirm.", "Confirmation", JOptionPane.YES_NO_OPTION);14 switch (selection) {15 case JOptionPane.YES_OPTION: // case JOptionPane.OK_OPTION is the same16 System.out.println("Yes");17 break;18 case JOptionPane.NO_OPTION:19 System.out.println("No");20 break;21 case JOptionPane.CANCEL_OPTION:22 System.out.println("Cancel");23 break;24 case JOptionPane.CLOSED_OPTION:25 System.out.println("Closed");26 break;27 }28 }29 });30 add(jb);3132 this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);33 setSize(250, 225);34 setLocationRelativeTo(null);35 setVisible(true);36 }37 38 public static void main(String args[]) {39 Test t = new Test();40 }41 }

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Confirmation Dialog Types

JOptionPane.showConfirmationDialog(Test.this, "Please confirm.", "Confirmation", JOptionPane.YES_NO_OPTION);

JOptionPane.showConfirmationDialog(Test.this, "Please confirm.", "Confirmation", JOptionPane.YES_NO_CANCEL_OPTION);

JOptionPane.showConfirmationDialog(Test.this, "Please confirm.", "Confirmation", JOptionPane.OK_CANCEL_OPTION);

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Input Dialog Example1 import java.awt.event.ActionEvent;2 import java.awt.event.ActionListener;34 import javax.swing.JButton;5 import javax.swing.JFrame;6 import javax.swing.JOptionPane;78 public class Test extends JFrame {9 public Test() {10 super("JOptionPane Example");11 JButton jb = new JButton("Click Here");12 jb.addActionListener(new ActionListener() {13 public void actionPerformed(ActionEvent ae) {14 String value = JOptionPane.showInputDialog(Test.this, 15 "Input", 16 "Input Dialog", 17 JOptionPane.QUESTION_MESSAGE);18 System.out.println("value = " + value);19 if (value == null) {20 System.out.println("Cancel button or X clicked");21 }22 }23 });2425 add(jb);2627 this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);28 setSize(250, 225);29 setLocationRelativeTo(null);30 setVisible(true);31 }32 33 public static void main(String args[]) {34 Test t = new Test();35 }36 }

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Input Dialog Types

String value = JOptionPane.showInputDialog(Test.this, “Input", “Input Dialog", JOptionPane.QUESTION_MESSAGE);

Object values[] = {"option 1", "option 2", "option 3"}; Object defaultValue = "option 2"; Object value = JOptionPane.showInputDialog(Test.this, "Input", "Input Dialog", JOptionPane.QUESTION_MESSAGE, null, // icon values, defaultValue);

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Input Dialog Types (cont.)

▪ If you have more 20 or more items in the list, you will have a multiple selection box instead of a drop down list

Object values[] = new Object[20]; for (int i=0; i < 20; i++) { values[i] = “option “ + (i+1); } Object defaultValue = "option 2"; Object value = JOptionPane.showInputDialog(Test.this, "Input", "Input Dialog", JOptionPane.QUESTION_MESSAGE, null, // icon values, defaultValue);

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Option Dialog Example1 import java.awt.event.ActionEvent;2 import java.awt.event.ActionListener;34 import javax.swing.JButton;5 import javax.swing.JFrame;6 import javax.swing.JOptionPane;78 public class Test extends JFrame {9 public Test() {10 super("JOptionPane Example");11 JButton jb = new JButton("Click Here");12 jb.addActionListener(new ActionListener() {13 public void actionPerformed(ActionEvent ae) {

14 Object [] options = {"Yes please", "No thanks", "Maybe"};15 int value = JOptionPane.showOptionDialog(Test.this, 16 "Which option would you like?", 17 "Option Dialog",18 JOptionPane.YES_NO_CANCEL_OPTION,19 JOptionPane.QUESTION_MESSAGE,20 null, // icon to display21 options,22 options[1]);23 System.out.println("value = " + value);24 if (value == 0) {25 System.out.println("Yes please clicked");26 }27 else if (value == 1) {28 System.out.println("No thanks clicked");29 }30 else if (value == 2) {31 System.out.println("Maybe clicked");32 }33 else { // value == -134 System.out.println("X clicked");35 }36 }37 });3839 add(jb);4041 this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);42 setSize(250, 225);43 setLocationRelativeTo(null);44 setVisible(true);45 }46 47 public static void main(String args[]) {48 Test t = new Test();49 }50 }

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Custom Option Panes

▪ In most cases, the standard option panes will suffice for an application

▪ If the standard option panes are too restrictive, you can always create your own using JDialog

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Image from http://docs.oracle.com/javase/tutorial/uiswing/components/dialog.html

Outline

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▪ Option Panes▪ Program

Program

▪ Create a dialog box that pops up over an application that looks like the following. Retrieve the values of the radio buttons and the button when it is clicked.

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Image from http://docs.oracle.com/javase/tutorial/uiswing/components/dialog.html