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JAVA JList Checkbox icn

The following code add checkbox and icons to JList. This example has three files: CheckListExample.java, CheckRenderer.java and CheckNode.java.

/*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.*;
import javax.swing.plaf.metal.*;

public class CheckListExample extends JFrame {

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

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

// set "home" icon
Icon icon = MetalIconFactory.getFileChooserHomeFolderIcon();
((CheckableItem)list.getModel().getElementAt(1)).setIcon(icon);

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;
private Icon icon;

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;
}

public void setIcon(Icon icon) {
this.icon = icon;
}

public Icon getIcon() {
return icon;
}
}

class CheckListRenderer extends CheckRenderer implements ListCellRenderer {
Icon commonIcon;

public CheckListRenderer() {
check.setBackground(UIManager.getColor("List.textBackground"));
label.setForeground(UIManager.getColor("List.textForeground"));
commonIcon = UIManager.getIcon("Tree.leafIcon");
}

public Component getListCellRendererComponent(JList list, Object value,
int index, boolean isSelected, boolean hasFocus) {
setEnabled(list.isEnabled());
check.setSelected(((CheckableItem)value).isSelected());
label.setFont(list.getFont());
label.setText(value.toString());
label.setSelected(isSelected);
label.setFocus(hasFocus);
Icon icon = ((CheckableItem)value).getIcon();
if (icon == null) {
icon = commonIcon;
}
label.setIcon(icon);
return this;
}
}

public static void main(String args[]) {
CheckListExample frame = new CheckListExample();
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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