Help on Multiple Event Listeners
Hi:
How do you implement both ItemListener and ListSelectionListener in the same interface? In another word, how do I put JRadioButton, JList, JComboBox...etc,each one with its own listener in init() method? I came up with the following program. Anyone have any idea fixing the problem?
import javax.swing.*;
import java.awt.*; //for border layout
import javax.swing.event.*; //for ListSelectionListener
import java.awt.event.*;
public class TextFormatter03 extends JApplet implements ActionListener
private Container masterPane, slavePane, bottomPane;
private JTextArea textPanel;
private JScrollPane textScrollPane;
private JRadioButton courierButton, serifButton, arialButton;
private JList sizeList;
private JCheckBox boldStyle,italicStyle;
private JComboBox fontColor;
private String colorItems[]={"Cyan","Green","Red","Blue","Magenta"};
private String sizeItems[]={"30","28","26","24","22"};
private String custFont;
private int custStyle, custSize;
public void init()
//get the content pane to add component on to
masterPane = this.getContentPane();
//deal with font
serifButton = new JRadioButton("Serif");
serifButton.setSelected(true);
courierButton = new JRadioButton("Courier");
courierButton.setSelected(false);
arialButton = new JRadioButton("Arial");
arialButton.setSelected(false);
//group the radio buttons
ButtonGroup group= new ButtonGroup();
group.add(serifButton);
group.add(courierButton);
group.add(arialButton);
//register a listener for the radio buttons
serifButton.addActionListener(this);
courierButton.addActionListener(this);
arialButton.addActionListener(this);
masterPane.add(group, BorderLayout.NORTH);
//deal with font size
sizeList = new JList (sizeItems);
sizeList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
sizeList.addListSelectionListener(this);
slavePane = new JScrollPane(sizeList,
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
masterPane.add(slavePane, BorderLayout.WEST);
//display text
textPanel= new JTextArea();
textPanel.setText("Select options to modify this text.");
textPanel.setBackground(Color.WHITE);
textPanel.setLineWrap(true);
textScrollPane = new JScrollPane(textPanel);
masterPane.add(textScrollPane, BorderLayout.CENTER);
textPanel.setFont(new Font("Serif",3,15));
//deal with font color
fontColor= new JComboBox(colorItems);
masterPane.add(fontColor);
//deal with font style
boldStyle = new JCheckBox("Bold");
boldStyle.setSelected(false);
boldStyle.addItemListener(this);
bottomPane.add(boldStyle);
italicStyle = new JCheckBox("Italic");
italicStyle.setSelected(false);
italicStyle.addItemListener(this);
bottomPane.add(italicStyle);
add(bottomPane, BorderLayout.SOUTH);
public void actionPerformed(ActionEvent e)
String Selected = "result";
//set the font
if(serifButton.isSelected())
custFont="Serif";
if(arialButton.isSelected())
custFont="Arial";
if(courierButton.isSelected())
custFont="Courier";
//set font style
if(boldStyle.isSelected())
custStyle = Font.BOLD;
if(italicStyle.isSelected())
custStyle = Font.ITALIC;
if(boldStyle.isSelected()&&italicStyle.isSelected())
custStyle = Font.BOLD + Font.ITALIC;
public void valueChanged(ListSelectionEvent event)
String response = "";
//set the font size
if(sizeList.getSelectedIndex()!=-1)
switch (sizeList.getSelectedIndex())
case 0:
custSize = 30;
break;
case 1:
custSize = 28;
break;
case 2:
custSize = 26;
break;
case 3:
custSize = 24;
break;
case 4:
custSize = 22;
break;
textPanel.setFont(new Font (custFont, custStyle,custSize));
//set font color
if(fontColor.getSelectedItem()=="Cyan")
textPanel.setForeground(Color.CYAN);
if(fontColor.getSelectedItem()=="Cyan")
textPanel.setForeground(Color.CYAN);
if(fontColor.getSelectedItem()=="Cyan")
textPanel.setForeground(Color.CYAN);
if(fontColor.getSelectedItem()=="Green")
textPanel.setForeground(Color.GREEN);
if(fontColor.getSelectedItem()=="Red")
textPanel.setForeground(Color.RED);
if(fontColor.getSelectedItem()=="Blue")
textPanel.setForeground(Color.BLUE);
if(fontColor.getSelectedItem()=="Magenta")
textPanel.setForeground(Color.MAGENTA);
}
Help. The program didn't compile. I followed what you suggested. Here are the program and the error message.
import javax.swing.*;
import java.awt.*; //for border layout
import javax.swing.event.*; //for ListSelectionListener
import java.awt.event.*;
public class TextFormatter03 extends JApplet implements ActionListener, ItemListener,ListSelectionListener
private Container masterPane, slavePane, bottomPane;
private JTextArea textPanel;
private JScrollPane textScrollPane;
private JRadioButton courierButton, serifButton, arialButton;
private JList sizeList;
private JCheckBox boldStyle,italicStyle;
private JComboBox fontColor;
private String colorItems[]={"Cyan","Green","Red","Blue","Magenta"};
private String sizeItems[]={"30","28","26","24","22"};
private String custFont;
private int custStyle, custSize;
public void init()
//get the content pane to add component on to
masterPane = this.getContentPane();
//deal with font
serifButton = new JRadioButton("Serif");
serifButton.setSelected(true);
courierButton = new JRadioButton("Courier");
courierButton.setSelected(false);
arialButton = new JRadioButton("Arial");
arialButton.setSelected(false);
//group the radio buttons
ButtonGroup group= new ButtonGroup();
group.add(serifButton);
group.add(courierButton);
group.add(arialButton);
//register a listener for the radio buttons
serifButton.addActionListener(this);
courierButton.addActionListener(this);
arialButton.addActionListener(this);
masterPane.add(group, BorderLayout.NORTH);
//deal with font size
sizeList = new JList (sizeItems);
sizeList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
sizeList.addListSelectionListener(this);
slavePane = new JScrollPane(sizeList,
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
masterPane.add(slavePane, BorderLayout.WEST);
//display text
textPanel= new JTextArea();
textPanel.setText("Select options to modify this text.");
textPanel.setBackground(Color.WHITE);
textPanel.setLineWrap(true);
textScrollPane = new JScrollPane(textPanel);
masterPane.add(textScrollPane, BorderLayout.CENTER);
textPanel.setFont(new Font("Serif",3,15));
//deal with font color
fontColor= new JComboBox(colorItems);
masterPane.add(fontColor);
//deal with font style
boldStyle = new JCheckBox("Bold");
boldStyle.setSelected(false);
boldStyle.addItemListener(this);
bottomPane.add(boldStyle);
italicStyle = new JCheckBox("Italic");
italicStyle.setSelected(false);
italicStyle.addItemListener(this);
bottomPane.add(italicStyle);
add(bottomPane, BorderLayout.SOUTH);
public void actionPerformed(ActionEvent e)
String Selected = "result";
//set the font
if(serifButton.isSelected())
custFont="Serif";
if(arialButton.isSelected())
custFont="Arial";
if(courierButton.isSelected())
custFont="Courier";
//set font style
if(boldStyle.isSelected())
custStyle = Font.BOLD;
if(italicStyle.isSelected())
custStyle = Font.ITALIC;
if(boldStyle.isSelected()&&italicStyle.isSelected())
custStyle = Font.BOLD + Font.ITALIC;
public void valueChanged(ListSelectionEvent event)
String response = "";
//set the font size
if(sizeList.getSelectedIndex()!=-1)
switch (sizeList.getSelectedIndex())
case 0:
custSize = 30;
break;
case 1:
custSize = 28;
break;
case 2:
custSize = 26;
break;
case 3:
custSize = 24;
break;
case 4:
custSize = 22;
break;
textPanel.setFont(new Font (custFont, custStyle,custSize));
//set font color
if(fontColor.getSelectedItem()=="Cyan")
textPanel.setForeground(Color.CYAN);
if(fontColor.getSelectedItem()=="Cyan")
textPanel.setForeground(Color.CYAN);
if(fontColor.getSelectedItem()=="Cyan")
textPanel.setForeground(Color.CYAN);
if(fontColor.getSelectedItem()=="Green")
textPanel.setForeground(Color.GREEN);
if(fontColor.getSelectedItem()=="Red")
textPanel.setForeground(Color.RED);
if(fontColor.getSelectedItem()=="Blue")
textPanel.setForeground(Color.BLUE);
if(fontColor.getSelectedItem()=="Magenta")
textPanel.setForeground(Color.MAGENTA);
TextFormatter03.java:6: TextFormatter03 should be declared abstract; it does not define itemStateChanged(java.awt.event.ItemEvent) in TextFormatter03
public class TextFormatter03 extends JApplet implements ActionListener, ItemListener,ListSelectionListener
^
java:44: cannot resolve symbol
symbol : method add (javax.swing.ButtonGroup,java.lang.String)
location: class java.awt.Container
masterPane.add(group, BorderLayout.NORTH);
^
2 errors
Process completed.
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Is it possible to show multiple events in the Events window of IMovie ?
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