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JAVA JList Checkbox

The following code add checkbox to JList.

/*Example modified from http://www.crionics.com/products/opensource/faq/swing_ex/JTableExamples2.html
*/



import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;

public class CheckListExample2 extends JFrame {

public CheckListExample2() {
super("CheckList Example");
String[] strs = {"swing", "home", "basic", "metal", "JList"};

final JList list = new JList( createData(strs) );

list.setCellRenderer(new CheckListRenderer());
list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
list.setBorder(new EmptyBorder(0,4,0,0));
list.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
int index = list.locationToIndex(e.getPoint());
CheckableItem item = (CheckableItem)list.getModel().getElementAt(index);
item.setSelected(! item.isSelected());
Rectangle rect = list.getCellBounds(index, index);
list.repaint(rect);
}
});
JScrollPane sp = new JScrollPane(list);

final JTextArea textArea = new JTextArea(3,10);
JScrollPane textPanel = new JScrollPane(textArea);
JButton printButton = new JButton("print");
printButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
ListModel model = list.getModel();
int n = model.getSize();
for (int i=0;i<n;i++) {
CheckableItem item = (CheckableItem)model.getElementAt(i);
if (item.isSelected()) {
textArea.append(item.toString());
textArea.append(System.getProperty("line.separator"));
}
}
}
});
JButton clearButton = new JButton("clear");
clearButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textArea.setText("");
}
});
JPanel panel = new JPanel(new GridLayout(2,1));
panel.add(printButton);
panel.add(clearButton);

getContentPane().add(sp, BorderLayout.CENTER);
getContentPane().add(panel, BorderLayout.EAST);
getContentPane().add(textPanel, BorderLayout.SOUTH);
}

private CheckableItem[] createData(String[] strs) {
int n = strs.length;
CheckableItem[] items = new CheckableItem[n];
for (int i=0;i<n;i++) {
items[i] = new CheckableItem(strs[i]);
}
return items;
}

class CheckableItem {
private String str;
private boolean isSelected;

public CheckableItem(String str) {
this.str = str;
isSelected = false;
}

public void setSelected(boolean b) {
isSelected = b;
}

public boolean isSelected() {
return isSelected;
}

public String toString() {
return str;
}
}

class CheckListRenderer extends JCheckBox implements ListCellRenderer {

public CheckListRenderer() {
setBackground(UIManager.getColor("List.textBackground"));
setForeground(UIManager.getColor("List.textForeground"));
}

public Component getListCellRendererComponent(JList list, Object value,
int index, boolean isSelected, boolean hasFocus) {
setEnabled(list.isEnabled());
setSelected(((CheckableItem)value).isSelected());
setFont(list.getFont());
setText(value.toString());
return this;
}
}

public static void main(String args[]) {
CheckListExample2 frame = new CheckListExample2();
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}
});
frame.setSize(300, 200);
frame.setVisible(true);
}
}

 

 

 


 


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Best books about JAVA programming from Amazon
Professional Java, JDK 5 Edition (Paperback Simply Java Programming: An Application-Driven Tutorial Approach (Paperback) Effective Java Programming Language Guide (Paperback) Head First Java, 2nd Edition (Paperback) Java : An Introduction to Problem Solving and Programming (4th Edition)

 

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