Mega Code Archive
Check List Example 2
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// Example from http://www.crionics.com/products/opensource/faq/swing_ex/SwingExamples.html
//File:CheckListExample2.java
/* (swing1.1.1beta2) */
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.GridLayout;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.ListCellRenderer;
import javax.swing.ListModel;
import javax.swing.ListSelectionModel;
import javax.swing.UIManager;
import javax.swing.border.EmptyBorder;
/**
* @version 1.0 04/26/99
*/
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[]) {
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
} catch (Exception evt) {}
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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