Checkbox Node Tree Example
// Example from http://www.crionics.com/products/opensource/faq/swing_ex/SwingExamples.html
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.GridLayout;
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 java.util.Enumeration;
import javax.swing.ButtonGroup;
import javax.swing.Icon;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTree;
import javax.swing.UIManager;
import javax.swing.border.TitledBorder;
import javax.swing.plaf.ColorUIResource;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeCellRenderer;
import javax.swing.tree.TreeNode;
import javax.swing.tree.TreePath;
import javax.swing.tree.TreeSelectionModel;
/**
* @version 1.1 01/15/99
*/
public class CheckNodeTreeExample extends JFrame {
public CheckNodeTreeExample() {
super("CheckNode TreeExample");
String[] strs = {"swing", // 0
"platf", // 1
"basic", // 2
"metal", // 3
"JTree"}; // 4
CheckNode[] nodes = new CheckNode[strs.length];
for (int i=0;i<strs.length;i++) {
nodes[i] = new CheckNode(strs[i]);
}
nodes[0].add(nodes[1]);
nodes[1].add(nodes[2]);
nodes[1].add(nodes[3]);
nodes[0].add(nodes[4]);
nodes[3].setSelected(true);
JTree tree = new JTree( nodes[0] );
tree.setCellRenderer(new CheckRenderer());
tree.getSelectionModel().setSelectionMode(
TreeSelectionModel.SINGLE_TREE_SELECTION
);
tree.putClientProperty("JTree.lineStyle", "Angled");
tree.addMouseListener(new NodeSelectionListener(tree));
JScrollPane sp = new JScrollPane(tree);
ModePanel mp = new ModePanel(nodes);
JTextArea textArea = new JTextArea(3,10);
JScrollPane textPanel = new JScrollPane(textArea);
JButton button = new JButton("print");
button.addActionListener(
new ButtonActionListener(nodes[0], textArea));
JPanel panel = new JPanel(new BorderLayout());
panel.add(mp, BorderLayout.CENTER);
panel.add(button, BorderLayout.SOUTH);
getContentPane().add(sp, BorderLayout.CENTER);
getContentPane().add(panel, BorderLayout.EAST);
getContentPane().add(textPanel, BorderLayout.SOUTH);
}
class NodeSelectionListener extends MouseAdapter {
JTree tree;
NodeSelectionListener(JTree tree) {
this.tree = tree;
}
public void mouseClicked(MouseEvent e) {
int x = e.getX();
int y = e.getY();
int row = tree.getRowForLocation(x, y);
TreePath path = tree.getPathForRow(row);
//TreePath path = tree.getSelectionPath();
if (path != null) {
CheckNode node = (CheckNode)path.getLastPathComponent();
boolean isSelected = ! (node.isSelected());
node.setSelected(isSelected);
if (node.getSelectionMode() == CheckNode.DIG_IN_SELECTION) {
if ( isSelected) {
tree.expandPath(path);
} else {
tree.collapsePath(path);
}
}
((DefaultTreeModel) tree.getModel()).nodeChanged(node);
// I need revalidate if node is root. but why?
if (row == 0) {
tree.revalidate();
tree.repaint();
}
}
}
}
class ModePanel extends JPanel implements ActionListener {
CheckNode[] nodes;
JRadioButton b_single, b_dig_in;
ModePanel(CheckNode[] nodes) {
this.nodes = nodes;
setLayout(new GridLayout(2, 1));
setBorder(new TitledBorder("Check Mode"));
ButtonGroup group = new ButtonGroup();
add(b_dig_in = new JRadioButton("DIG_IN "));
add(b_single = new JRadioButton("SINGLE "));
group.add(b_dig_in);
group.add(b_single);
b_dig_in.addActionListener(this);
b_single.addActionListener(this);
b_dig_in.setSelected(true);
}
public void actionPerformed(ActionEvent e) {
int mode;
if (b_single == e.getSource()) {
mode = CheckNode.SINGLE_SELECTION;
} else {
mode = CheckNode.DIG_IN_SELECTION;
}
for (int i = 0; i < nodes.length; i++) {
nodes[i].setSelectionMode(mode);
}
}
}
class ButtonActionListener implements ActionListener {
CheckNode root;
JTextArea textArea;
ButtonActionListener(final CheckNode root, final JTextArea textArea) {
this.root = root;
this.textArea = textArea;
}
public void actionPerformed(ActionEvent ev) {
Enumeration e = root.breadthFirstEnumeration();
while (e.hasMoreElements()) {
CheckNode node = (CheckNode) e.nextElement();
if (node.isSelected()) {
TreeNode[] nodes = node.getPath();
textArea.append("\n" + nodes[0].toString());
for (int i = 1; i < nodes.length; i++) {
textArea.append("/" + nodes[i].toString());
}
}
}
}
}
public static void main(String args[]) {
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
} catch (Exception evt) {}
CheckNodeTreeExample frame = new CheckNodeTreeExample();
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
frame.setSize(300, 200);
frame.setVisible(true);
}
}
class CheckRenderer extends JPanel implements TreeCellRenderer {
protected JCheckBox check;
protected TreeLabel label;
public CheckRenderer() {
setLayout(null);
add(check = new JCheckBox());
add(label = new TreeLabel());
check.setBackground(UIManager.getColor("Tree.textBackground"));
label.setForeground(UIManager.getColor("Tree.textForeground"));
}
public Component getTreeCellRendererComponent(JTree tree, Object value,
boolean isSelected, boolean expanded, boolean leaf, int row,
boolean hasFocus) {
String stringValue = tree.convertValueToText(value, isSelected,
expanded, leaf, row, hasFocus);
setEnabled(tree.isEnabled());
check.setSelected(((CheckNode) value).isSelected());
label.setFont(tree.getFont());
label.setText(stringValue);
label.setSelected(isSelected);
label.setFocus(hasFocus);
if (leaf) {
label.setIcon(UIManager.getIcon("Tree.leafIcon"));
} else if (expanded) {
label.setIcon(UIManager.getIcon("Tree.openIcon"));
} else {
label.setIcon(UIManager.getIcon("Tree.closedIcon"));
}
return this;
}
public Dimension getPreferredSize() {
Dimension d_check = check.getPreferredSize();
Dimension d_label = label.getPreferredSize();
return new Dimension(d_check.width + d_label.width,
(d_check.height < d_label.height ? d_label.height
: d_check.height));
}
public void doLayout() {
Dimension d_check = check.getPreferredSize();
Dimension d_label = label.getPreferredSize();
int y_check = 0;
int y_label = 0;
if (d_check.height < d_label.height) {
y_check = (d_label.height - d_check.height) / 2;
} else {
y_label = (d_check.height - d_label.height) / 2;
}
check.setLocation(0, y_check);
check.setBounds(0, y_check, d_check.width, d_check.height);
label.setLocation(d_check.width, y_label);
label.setBounds(d_check.width, y_label, d_label.width, d_label.height);
}
public void setBackground(Color color) {
if (color instanceof ColorUIResource)
color = null;
super.setBackground(color);
}
public class TreeLabel extends JLabel {
boolean isSelected;
boolean hasFocus;
public TreeLabel() {
}
public void setBackground(Color color) {
if (color instanceof ColorUIResource)
color = null;
super.setBackground(color);
}
public void paint(Graphics g) {
String str;
if ((str = getText()) != null) {
if (0 < str.length()) {
if (isSelected) {
g.setColor(UIManager
.getColor("Tree.selectionBackground"));
} else {
g.setColor(UIManager.getColor("Tree.textBackground"));
}
Dimension d = getPreferredSize();
int imageOffset = 0;
Icon currentI = getIcon();
if (currentI != null) {
imageOffset = currentI.getIconWidth()
+ Math.max(0, getIconTextGap() - 1);
}
g.fillRect(imageOffset, 0, d.width - 1 - imageOffset,
d.height);
if (hasFocus) {
g.setColor(UIManager
.getColor("Tree.selectionBorderColor"));
g.drawRect(imageOffset, 0, d.width - 1 - imageOffset,
d.height - 1);
}
}
}
super.paint(g);
}
public Dimension getPreferredSize() {
Dimension retDimension = super.getPreferredSize();
if (retDimension != null) {
retDimension = new Dimension(retDimension.width + 3,
retDimension.height);
}
return retDimension;
}
public void setSelected(boolean isSelected) {
this.isSelected = isSelected;
}
public void setFocus(boolean hasFocus) {
this.hasFocus = hasFocus;
}
}
}
class CheckNode extends DefaultMutableTreeNode {
public final static int SINGLE_SELECTION = 0;
public final static int DIG_IN_SELECTION = 4;
protected int selectionMode;
protected boolean isSelected;
public CheckNode() {
this(null);
}
public CheckNode(Object userObject) {
this(userObject, true, false);
}
public CheckNode(Object userObject, boolean allowsChildren,
boolean isSelected) {
super(userObject, allowsChildren);
this.isSelected = isSelected;
setSelectionMode(DIG_IN_SELECTION);
}
public void setSelectionMode(int mode) {
selectionMode = mode;
}
public int getSelectionMode() {
return selectionMode;
}
public void setSelected(boolean isSelected) {
this.isSelected = isSelected;
if ((selectionMode == DIG_IN_SELECTION) && (children != null)) {
Enumeration e = children.elements();
while (e.hasMoreElements()) {
CheckNode node = (CheckNode) e.nextElement();
node.setSelected(isSelected);
}
}
}
public boolean isSelected() {
return isSelected;
}
// If you want to change "isSelected" by CellEditor,
/*
public void setUserObject(Object obj) { if (obj instanceof Boolean) {
* setSelected(((Boolean)obj).booleanValue()); } else {
* super.setUserObject(obj); } }
*/
}
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