SD2054

Software Development

By the end of this lecture you should be able to:

Advanced Graphics Programming

• create pull down menus

• create combo boxes

• create option dialogues

• create message dialogues

• create input dialogues

• create confirm dialogues.

import javax.swing.*;

Making choices

pull-down menus

combo boxes

Pull-down menus

Pull-down menus

Pull-down menus

Pull-down menus

Pull-down menus

Pull-down menus

Pull-down menus

JFrame

JFrame

public class Flag extends JFrame implements ActionListener{

}

Declare menu components as attributes of the Flag class

JMenuBar

private JMenuBar bar = new JMenuBar();

JMenuBar

JMenu

JMenu

private JMenu topStripeMenu = new JMenu("Top Colour");

JMenu

JMenu

private JMenu middleStripeMenu = new JMenu(“Middle Colour");

JMenu

JMenu

private JMenu bottomStripeMenu = new JMenu(“Bottom Colour");

JMenuItem

JMenuItem

private JMenuItem blueStripe = new JMenuItem("Blue");

JMenuItem

JMenuItem

private JMenuItem redStripe = new JMenuItem(“Red");

Assemble menu components onto the screen in the Constructor

public Flag( ){

setVisible(true);}

First, add menu-items …..

… to menu

blueStripe

topStripeMenu

blueStripe

topStripeMenu.add(blueStripe);

topStripeMenu

blueStripe

topStripeMenu

redStripe

topStripeMenu

redStripe

topStripeMenu.add(redStripe);

Then, add menu …..

… to menu-bar

bar

topStripeMenu

bar

topStripeMenu

bar

bar.add(topStripeMenu);

Finally, add menu-bar …..

…. to frame

bar

bar

setJMenuBar(bar);

Processing menu choices…..

..first, give each menu item a listener in the constructor.

blueStripe

blueStripe

blueStripe.addActionListener(this);

..then write the code to process a menu item in the actionPerformed method.

blueStripe

public void actionPerformed(ActionEvent e){

}

blueStripe

public void actionPerformed(ActionEvent e){

}

if (e.getSource() == blueStripe){ // code to process menu choice here }

JPanel

public void actionPerformed(ActionEvent e){

}

if (e.getSource() == blueStripe){ // code to process menu choice here }

topPanel

public void actionPerformed(ActionEvent e){

}

if (e.getSource() == blueStripe){ // code to process menu choice here }

topPanel

public void actionPerformed(ActionEvent e){

}

if (e.getSource() == blueStripe){ topPanel.setBackground(Color.blue); }

public void actionPerformed(ActionEvent e){

}

if (e.getSource() == blueStripe){ topPanel.setBackground(Color.blue); }

The JComboBox class

The JComboBox class

private String[ ] colours = {"Select colour","Red", "Blue", "Green"};

private JComboBox box = new JComboBox(colours);

box.addActionListener(this);

String item = box.getSelectedItem();

String item = box.getSelectedItem();

String item = (String) box.getSelectedItem();

String item = (String) box.getSelectedItem();

if (item.equals("Red")) { getContentPane().setBackground(Color.red); }

if (item.equals("Red")) { getContentPane().setBackground(Color.red); }

box.setSelectedIndex(0);

box.setSelectedIndex(0);

The JOption Class

• creating option dialogues

• creating message dialogues

• creating input dialogues

• creating confirm dialogues.

The JOptionPane dialogue class

The JOptionPane dialogue class

Option Dialogue

String[ ] choice = {"Enter a word", "Find the secret", "Quit"};

String[ ] choice = {"Enter a word", "Find the secret", "Quit"};

result = JOptionPane.showOptionDialog (null, "Choose an option", "Magic Words",

JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE, null, choice, "Enter a word");

result = JOptionPane.showOptionDialog (null, "Choose an option", "Magic Words",

JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE, null, choice, "Enter a word");

result = JOptionPane.showOptionDialog (null, "Choose an option", "Magic Words",

JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE, null, choice, "Enter a word");

indicates no parent

frame

result = JOptionPane.showOptionDialog (null, "Choose an option", "Magic Words",

JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE, null, choice, "Enter a word");

Could use the this keyword if

there is a parent frame.

result = JOptionPane.showOptionDialog (null, "Choose an option", "Magic Words",

JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE, null, choice, "Enter a word");

result = JOptionPane.showOptionDialog (null, "Choose an option", "Magic Words",

JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE, null, choice, "Enter a word");

result = JOptionPane.showOptionDialog (null, "Choose an option", "Magic Words",

JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE, null, choice, "Enter a word");

result = JOptionPane.showOptionDialog (null, "Choose an option", "Magic Words",

JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE, null, choice, "Enter a word");

result = JOptionPane.showOptionDialog (null, "Choose an option", "Magic Words",

JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE, null, choice, "Enter a word");

result = JOptionPane.showOptionDialog (null, "Choose an option", "Magic Words",

JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE, null, choice, "Enter a word");

or an icon of your choice

result = JOptionPane.showOptionDialog (null, "Choose an option", "Magic Words",

JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE, null, choice, "Enter a word");

result = JOptionPane.showOptionDialog (null, "Choose an option", "Magic Words",

JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE, null, choice, "Enter a word");

result = JOptionPane.showOptionDialog (null, "Choose an option", "Magic Words",

JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE, null, choice, "Enter a word");

result = JOptionPane.showOptionDialog (null, "Choose an option", "Magic Words",

JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE, null, choice, "Enter a word");

0 = button 11 = button 22 = button 3

The JOptionPane dialogue class

The JOptionPane dialogue class

Input Dialogue

word = JOptionPane.showInputDialog (null,

"Enter a word", null, JOptionPane.PLAIN_MESSAGE);

word = JOptionPane.showInputDialog (null,

"Enter a word", null, JOptionPane.PLAIN_MESSAGE);

word = JOptionPane.showInputDialog (null,

"Enter a word", null, JOptionPane.PLAIN_MESSAGE);

word = JOptionPane.showInputDialog (null,

"Enter a word", null, JOptionPane.PLAIN_MESSAGE);

word = JOptionPane.showInputDialog (null,

"Enter a word", null, JOptionPane.PLAIN_MESSAGE);

word = JOptionPane.showInputDialog (null,

"Enter a word", null, JOptionPane.PLAIN_MESSAGE);

The JOptionPane dialogue class

The JOptionPane dialogue class

Message Dialogue

JOptionPane.showMessageDialog (null, “You did not enter a magic word”,

null, JOptionPane.INFORMATION_MESSAGE);

JOptionPane.showMessageDialog (null, “You did not enter a magic word”,

null, JOptionPane.INFORMATION_MESSAGE);

JOptionPane.showMessageDialog (null, “You did not enter a magic word”,

null, JOptionPane.INFORMATION_MESSAGE);

JOptionPane.showMessageDialog (null, “You did not enter a word”, null,

JOptionPane.INFORMATION_MESSAGE);

JOptionPane.showMessageDialog (null, “You did not enter a word”, null,

JOptionPane.INFORMATION_MESSAGE);

JOptionPane.showMessageDialog (null, “You did not enter a word”, null,

JOptionPane.ERROR_MESSAGE);

The JOptionPane dialogue class

The JOptionPane dialogue class

Confirm Dialogue

answer = JOptionPane.showConfirmDialog (null, "Are you sure you want to know the secret?", null, JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);

answer = JOptionPane.showConfirmDialog (null, "Are you sure you want to know the secret?", null, JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);

answer = JOptionPane.showConfirmDialog (null, "Are you sure you want to know the secret?", null, JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);

answer = JOptionPane.showConfirmDialog (null, "Are you sure you want to know the secret?", null, JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);

answer = JOptionPane.showConfirmDialog (null, "Are you sure you want to know the secret?", null, JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);

if(answer == JOptionPane.YES_OPTION){

// process choice here

}