How to add checkbox to JTree node to manage multiselection?
I want to build JTree which has nodes that contain check box + icon + data and tree selection algorithm.
Answer
This is full example that demonstrate how to add checkbox to Jtree node. I used JTree with nodes based on File system content.
I usesd also AddCheckBoxToTree.CheckTreeManager class to manage selection or semi selection options.
Use
public AddCheckBoxToTree.CheckTreeManager getCheckTreeManager() {
return checkTreeManager;
}
method to play with selection tree path.
for example:
// clear all selected path in order
TreePath[] paths=getCheckTreeManager().getSelectionModel().getSelectionPaths();
if(paths != null){
for(TreePath tp : paths){
getCheckTreeManager().getSelectionModel().removeSelectionPath(tp);
}
}
here I pasted all code that do that:
package com.demo.tree.checkbox;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.io.File;
import java.util.Vector;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.SwingUtilities;
import javax.swing.ToolTipManager;
import javax.swing.UIManager;
import javax.swing.event.TreeExpansionEvent;
import javax.swing.event.TreeExpansionListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeCellRenderer;
import javax.swing.tree.TreePath;
import javax.swing.tree.TreeSelectionModel;
public class FileTreeViewer extends JFrame {
private static final long serialVersionUID = 1L;
public static final ImageIcon ICON_COMPUTER = new ImageIcon("");
public static final ImageIcon ICON_DISK = new ImageIcon("defaults1.png");
public static final ImageIcon ICON_FOLDER = new ImageIcon("fol_orig.png");
public static final ImageIcon ICON_EXPANDEDFOLDER = new ImageIcon("folder_open.png");
protected JTree m_tree;
protected DefaultTreeModel m_model;
AddCheckBoxToTree AddCh = new AddCheckBoxToTree();
private AddCheckBoxToTree.CheckTreeManager checkTreeManager;
protected TreePath m_clickedPath;
public FileTreeViewer()
{
super("Demo tree check box");
setSize(400, 300);
DefaultMutableTreeNode top = new DefaultMutableTreeNode(
new IconData(ICON_COMPUTER, null, "Computer"));
DefaultMutableTreeNode node;
File[] roots = File.listRoots();
for (int k=0; k<roots.length; k++)
{
node = new DefaultMutableTreeNode(new IconData(ICON_DISK, null, new FileNode(roots[k])));
top.add(node);
node.add(new DefaultMutableTreeNode( new Boolean(true) ));
}
m_model = new DefaultTreeModel(top);
m_tree = new JTree(m_model){
public String getToolTipText(MouseEvent ev)
{
if(ev == null)
return null;
TreePath path = m_tree.getPathForLocation(ev.getX(),
ev.getY());
if (path != null)
{
FileNode fnode = getFileNode(getTreeNode(path));
if (fnode==null)
return null;
File f = fnode.getFile();
return (f==null ? null : f.getPath());
}
return null;
}
};
ToolTipManager.sharedInstance().registerComponent(m_tree);
m_tree.putClientProperty("JTree.lineStyle", "Angled");
TreeCellRenderer renderer = new IconCellRenderer();
m_tree.setCellRenderer(renderer);
m_tree.addTreeExpansionListener(new DirExpansionListener());
m_tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
m_tree.setShowsRootHandles(true);
m_tree.setEditable(false);
checkTreeManager = AddCh.new CheckTreeManager(m_tree, null);
JScrollPane s = new JScrollPane();
s.getViewport().add(m_tree);
getContentPane().add(s, BorderLayout.CENTER);
WindowListener wndCloser = new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
};
addWindowListener(wndCloser);
setVisible(true);
}
DefaultMutableTreeNode getTreeNode(TreePath path)
{
return (DefaultMutableTreeNode)(path.getLastPathComponent());
}
FileNode getFileNode(DefaultMutableTreeNode node)
{
if (node == null)
return null;
Object obj = node.getUserObject();
if (obj instanceof IconData)
obj = ((IconData)obj).getObject();
if (obj instanceof FileNode)
return (FileNode)obj;
else
return null;
}
public AddCheckBoxToTree.CheckTreeManager getCheckTreeManager() {
return checkTreeManager;
}
// Make sure expansion is threaded and updating the tree model
// only occurs within the event dispatching thread.
class DirExpansionListener implements TreeExpansionListener
{
public void treeExpanded(TreeExpansionEvent event)
{
final DefaultMutableTreeNode node = getTreeNode(
event.getPath());
final FileNode fnode = getFileNode(node);
Thread runner = new Thread()
{
public void run()
{
if (fnode != null && fnode.expand(node))
{
Runnable runnable = new Runnable()
{
public void run()
{
m_model.reload(node);
}
};
SwingUtilities.invokeLater(runnable);
}
}
};
runner.start();
}
public void treeCollapsed(TreeExpansionEvent event) {}
}
public static void main(String argv[])
{
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
} catch (Exception evt) {}
new FileTreeViewer();
}
}
class IconCellRenderer extends JLabel implements TreeCellRenderer{
protected Color m_textSelectionColor;
protected Color m_textNonSelectionColor;
protected Color m_bkSelectionColor;
protected Color m_bkNonSelectionColor;
protected Color m_borderSelectionColor;
protected boolean m_selected;
public IconCellRenderer()
{
super();
m_textSelectionColor = UIManager.getColor(
"Tree.selectionForeground");
m_textNonSelectionColor = UIManager.getColor(
"Tree.textForeground");
m_bkSelectionColor = UIManager.getColor(
"Tree.selectionBackground");
m_bkNonSelectionColor = UIManager.getColor(
"Tree.textBackground");
m_borderSelectionColor = UIManager.getColor(
"Tree.selectionBorderColor");
setOpaque(false);
}
public Component getTreeCellRendererComponent(JTree tree,
Object value, boolean sel, boolean expanded, boolean leaf,
int row, boolean hasFocus)
{
DefaultMutableTreeNode node =
(DefaultMutableTreeNode)value;
Object obj = node.getUserObject();
setText(obj.toString());
if (obj instanceof Boolean)
setText("Retrieving data...");
if (obj instanceof IconData)
{
IconData idata = (IconData)obj;
if (expanded)
setIcon(idata.getExpandedIcon());
else
setIcon(idata.getIcon());
}
else
setIcon(null);
setFont(tree.getFont());
setForeground(sel ? m_textSelectionColor :
m_textNonSelectionColor);
setBackground(sel ? m_bkSelectionColor :
m_bkNonSelectionColor);
m_selected = sel;
return this;
}
public void paintComponent(Graphics g)
{
Color bColor = getBackground();
Icon icon = getIcon();
g.setColor(bColor);
int offset = 0;
if(icon != null && getText() != null)
offset = (icon.getIconWidth() + getIconTextGap());
g.fillRect(offset, 0, getWidth() - 1 - offset,
getHeight() - 1);
if (m_selected)
{
g.setColor(m_borderSelectionColor);
g.drawRect(offset, 0, getWidth()-1-offset, getHeight()-1);
}
super.paintComponent(g);
}
}
class IconData {
protected Icon m_icon;
protected Icon m_expandedIcon;
protected Object m_data;
public IconData(Icon icon, Object data)
{
m_icon = icon;
m_expandedIcon = null;
m_data = data;
}
public IconData(Icon icon, Icon expandedIcon, Object data)
{
m_icon = icon;
m_expandedIcon = expandedIcon;
m_data = data;
}
public Icon getIcon()
{
return m_icon;
}
public Icon getExpandedIcon()
{
return m_expandedIcon!=null ? m_expandedIcon : m_icon;
}
public Object getObject()
{
return m_data;
}
public String toString()
{
return m_data.toString();
}
}
class FileNode {
protected File m_file;
public FileNode(File file)
{
m_file = file;
}
public File getFile()
{
return m_file;
}
public String toString()
{
return m_file.getName().length() > 0 ? m_file.getName() :
m_file.getPath();
}
public boolean expand(DefaultMutableTreeNode parent){
DefaultMutableTreeNode flag = (DefaultMutableTreeNode)parent.getFirstChild();
if (flag==null) // No flag
return false;
Object obj = flag.getUserObject();
if (!(obj instanceof Boolean))
return false; // Already expanded
parent.removeAllChildren(); // Remove Flag
File[] files = listFiles();
if (files == null)
return true;
Vector<FileNode> v = new Vector<FileNode>();
for (int k=0; k<files.length; k++){
File f = files[k];
if (!(f.isDirectory()))
continue;
FileNode newNode = new FileNode(f);
boolean isAdded = false;
for (int i=0; i<v.size(); i++)
{
FileNode nd = (FileNode)v.elementAt(i);
if (newNode.compareTo(nd) < 0)
{
v.insertElementAt(newNode, i);
isAdded = true;
break;
}
}
if (!isAdded)
v.addElement(newNode);
}
for (int i=0; i<v.size(); i++){
FileNode nd = (FileNode)v.elementAt(i);
IconData idata = new IconData(FileTreeViewer.ICON_FOLDER, FileTreeViewer.ICON_EXPANDEDFOLDER, nd);
DefaultMutableTreeNode node = new
DefaultMutableTreeNode(idata);
parent.add(node);
if (nd.hasSubDirs())
node.add(new DefaultMutableTreeNode(
new Boolean(true) ));
}
return true;
}
public boolean hasSubDirs(){
File[] files = listFiles();
if (files == null)
return false;
for (int k=0; k<files.length; k++)
{
if (files[k].isDirectory())
return true;
}
return false;
}
public int compareTo(FileNode toCompare){
return m_file.getName().compareToIgnoreCase(
toCompare.m_file.getName() );
}
protected File[] listFiles(){
if (!m_file.isDirectory())
return null;
try
{
return m_file.listFiles();
}
catch (Exception ex)
{
JOptionPane.showMessageDialog(null, "Error reading directory "+m_file.getAbsolutePath(),"Warning", JOptionPane.WARNING_MESSAGE);
return null;
}
}
}
Till now all was good and clear. Now i'm going to paste selection Controller, here we go:
Here we create checkbox element to add after to tree node
package com.demo.tree.checkbox;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.AbstractAction;
import javax.swing.ActionMap;
import javax.swing.ButtonGroup;
import javax.swing.ButtonModel;
import javax.swing.Icon;
import javax.swing.JCheckBox;
import javax.swing.SwingUtilities;
import javax.swing.event.ChangeListener;
import javax.swing.plaf.ActionMapUIResource;
public class TristateCheckBox extends JCheckBox {
static final long serialVersionUID =0;
/** This is a type-safe enumerated type */
public static class State
{
private State() {}
}
public final State NOT_SELECTED = new State();
public final State SELECTED = new State();
public final static State DONT_CARE = new State();
private final TristateDecorator model;
public TristateCheckBox(String text, Icon icon, State initial){
super(text, icon);
// Add a listener for when the mouse is pressed
super.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
grabFocus();
model.nextState();
}
});
// Reset the keyboard action map
ActionMap map = new ActionMapUIResource();
map.put("pressed", new AbstractAction() {
private static final long serialVersionUID = 1L;
public void actionPerformed(ActionEvent e) {
grabFocus();
model.nextState();
}
});
map.put("released", null);
SwingUtilities.replaceUIActionMap(this, map);
// set the model to the adapted model
model = new TristateDecorator(getModel());
setModel(model);
setState(initial);
}
// Constractor types:
public TristateCheckBox(String text, State initial) {
this(text, null, initial);
}
public TristateCheckBox(String text) {
this(text, DONT_CARE);
}
public TristateCheckBox() {
this(null);
}
/** No one may add mouse listeners, not even Swing! */
public void addMouseListener(MouseListener l) { }
/**
* Set the new state to either SELECTED, NOT_SELECTED or
* DONT_CARE. If state == null, it is treated as DONT_CARE.
*/
public void setState(State state) {
model.setState(state);
}
/** Return the current state, which is determined by the
* selection status of the model. */
public State getState() {
return model.getState();
}
public void setSelected(boolean b) {
if (b) {
setState(SELECTED);
} else {
setState(NOT_SELECTED);
}
}
/**
* Exactly which Design Pattern is this? Is it an Adapter,
* a Proxy or a Decorator? In this case, my vote lies with the
* Decorator, because we are extending functionality and
* "decorating" the original model with a more powerful model.
*/
private class TristateDecorator implements ButtonModel {
private final ButtonModel other;
private TristateDecorator(ButtonModel other) {
this.other = other;
}
private void setState(State state) {
if (state == NOT_SELECTED) {
other.setArmed(false);
setPressed(false);
setSelected(false);
} else if (state == SELECTED) {
other.setArmed(false);
setPressed(false);
setSelected(true);
} else { // either "null" or DONT_CARE
other.setArmed(true);
setPressed(true);
setSelected(false);
}
}
/**
* The current state is embedded in the selection / armed
* state of the model.
*
* We return the SELECTED state when the checkbox is selected
* but not armed, DONT_CARE state when the checkbox is
* selected and armed (grey) and NOT_SELECTED when the
* checkbox is deselected.
*/
private State getState() {
if (isSelected() && !isArmed()) {
// normal black tick
return SELECTED;
} else if (isSelected() && isArmed()) {
// don't care grey tick
return DONT_CARE;
} else {
// normal deselected
return NOT_SELECTED;
}
}
/** We rotate between NOT_SELECTED, SELECTED and DONT_CARE.*/
private void nextState() {
State current = getState();
if (current == NOT_SELECTED) {
setState(SELECTED);
} else if (current == SELECTED) {
setState(DONT_CARE);
} else if (current == DONT_CARE) {
setState(NOT_SELECTED);
}
}
/** Filter: No one may change the armed status except us. */
public void setArmed(boolean b) {
}
/** We disable focusing on the component when it is not
* enabled. */
public void setEnabled(boolean b) {
setFocusable(b);
other.setEnabled(b);
}
/** All these methods simply delegate to the "other" model
* that is being decorated. */
public boolean isArmed() {return other.isArmed(); }
public boolean isSelected() {return other.isSelected(); }
public boolean isEnabled() {return other.isEnabled(); }
public boolean isPressed() {return other.isPressed(); }
public boolean isRollover() {return other.isRollover(); }
public int getMnemonic() {return other.getMnemonic(); }
public String getActionCommand() {return other.getActionCommand();}
public Object[]getSelectedObjects() {return other.getSelectedObjects();}
public void setSelected(boolean b) {other.setSelected(b);}
public void setPressed(boolean b) {other.setPressed(b);}
public void setRollover(boolean b) {other.setRollover(b);}
public void setMnemonic(int key) {other.setMnemonic(key);}
public void setActionCommand(String s) {other.setActionCommand(s);}
public void setGroup(ButtonGroup group) {other.setGroup(group);}
public void addActionListener(ActionListener l) {other.addActionListener(l);}
public void removeActionListener(ActionListener l) {other.removeActionListener(l);}
public void addItemListener(ItemListener l) {other.addItemListener(l);}
public void removeItemListener(ItemListener l) {other.removeItemListener(l);}
public void addChangeListener(ChangeListener l) {other.addChangeListener(l);}
public void removeChangeListener(ChangeListener l) {other.removeChangeListener(l);}
}
}
After we add CheckTreeManager:
package com.demo.tree.checkbox;
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import java.util.Stack;
import javax.swing.JCheckBox;
import javax.swing.JPanel;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultTreeSelectionModel;
import javax.swing.tree.TreeCellRenderer;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;
import javax.swing.tree.TreeSelectionModel;
public class AddCheckBoxToTree {
public class CheckTreeSelectionModel extends DefaultTreeSelectionModel{
static final long serialVersionUID =0;
private TreeModel model;
public CheckTreeSelectionModel(TreeModel model){
this.model = model;
setSelectionMode(TreeSelectionModel.DISCONTIGUOUS_TREE_SELECTION);
}
// tests whether there is any unselected node in the subtree of given path (DONT_CARE)
public boolean isPartiallySelected(TreePath path){
if(isPathSelected(path, true)){
return false;
}
TreePath[] selectionPaths = getSelectionPaths();
if(selectionPaths==null){
return false;
}
for(int j = 0; j<selectionPaths.length; j++){
if(isDescendant(selectionPaths[j], path)){
return true;
}
}
return false;
}
// tells whether given path is selected.
// if dig is true, then a path is assumed to be selected, if
// one of its ancestor is selected.
public boolean isPathSelected(TreePath path, boolean dig){
if(!dig){
return super.isPathSelected(path);
}
while(path!=null && !super.isPathSelected(path)){
path = path.getParentPath();
}
return path!=null;
}
// is path1 descendant of path2
private boolean isDescendant(TreePath path1, TreePath path2){
Object obj1[] = path1.getPath();
Object obj2[] = path2.getPath();
for(int i = 0; i<obj2.length; i++){
if(obj1[i]!=obj2[i])
return false;
}
return true;
}
public void setSelectionPaths(TreePath[] pPaths){
throw new UnsupportedOperationException("not implemented yet!!!");
}
public void addSelectionPaths(TreePath[] paths){
// unselect all descendants of paths[]
for(int i = 0; i<paths.length; i++)
{
TreePath path = paths[i];
TreePath[] selectionPaths = getSelectionPaths();
if(selectionPaths==null){
break;
}
ArrayList<TreePath> toBeRemoved = new ArrayList<TreePath>();
for(int j = 0; j<selectionPaths.length; j++)
{
if(isDescendant(selectionPaths[j], path))
{
toBeRemoved.add(selectionPaths[j]);
}
}
super.removeSelectionPaths((TreePath[])toBeRemoved.toArray(new TreePath[0]));
}
// if all siblings are selected then unselect them and select parent recursively
// otherwize just select that path.
for(int i = 0; i<paths.length; i++){
TreePath path = paths[i];
TreePath temp = null;
while(areSiblingsSelected(path)){
temp = path;
if(path.getParentPath()==null)
{
break;
}
path = path.getParentPath();
}
if(temp!=null){
if(temp.getParentPath()!=null)
{
addSelectionPath(temp.getParentPath());
}
else
{
if(!isSelectionEmpty())
{
removeSelectionPaths(getSelectionPaths());
}
super.addSelectionPaths(new TreePath[]{temp});
}
}
else
{
super.addSelectionPaths(new TreePath[]{ path});
}
}
}
// tells whether all siblings of given path are selected.
private boolean areSiblingsSelected(TreePath path){
TreePath parent = path.getParentPath();
if(parent==null){
return true;
}
Object node = path.getLastPathComponent();
Object parentNode = parent.getLastPathComponent();
int childCount = model.getChildCount(parentNode);
Boolean isParameters = false;
Boolean isDescription = false;
for(int i = 0; i<childCount; i++){
Object childNode = model.getChild(parentNode, i);
if(childNode==node){
continue;
}
// If last Path component equals to "parameters" or "description" - select second child too.
if(childCount == 2)
{
if(childNode.toString().equals("parameters") && model.isLeaf(childNode))
{
isParameters = true;
}
if(childNode.toString().equals("description") && model.isLeaf(childNode))
{
isDescription = true;
}
}
if(!isPathSelected(parent.pathByAddingChild(childNode)) && !isParameters && !isDescription){
return false;
}
}
return true;
}
public void removeSelectionPaths(TreePath[] paths){
for(int i = 0; i<paths.length; i++){
TreePath path = paths[i];
if(path.getPathCount()==1)
super.removeSelectionPaths(new TreePath[]{ path});
else
toggleRemoveSelection(path);
}
}
/** if any ancestor node of given path is selected then unselect it
* and selection all its descendants except given path and descendants.
* otherwise just unselect the given path */
private void toggleRemoveSelection(TreePath path){
Stack<TreePath> stack = new Stack<TreePath>();
TreePath parent = path.getParentPath();
Boolean isParameters = false;
Boolean isDescription = false;
while(parent!=null && !isPathSelected(parent)){
stack.push(parent);
parent = parent.getParentPath();
}
if(parent!=null)
stack.push(parent);
else{
super.removeSelectionPaths(new TreePath[]{path});
return;
}
while(!stack.isEmpty()){
TreePath temp = (TreePath)stack.pop();
TreePath peekPath = stack.isEmpty() ? path : (TreePath)stack.peek();
Object node = temp.getLastPathComponent();
Object peekNode = peekPath.getLastPathComponent();
int childCount = model.getChildCount(node);
for(int i = 0; i<childCount; i++){
Object childNode = model.getChild(node, i);
if(childNode.toString().equals("parameters") && model.isLeaf(childNode))
{
isParameters = true;
}
if(childNode.toString().equals("description") && model.isLeaf(childNode))
{
isDescription = true;
}
if(childNode!=peekNode)
{
if(!isParameters && !isDescription)
super.addSelectionPaths(new TreePath[]{temp.pathByAddingChild(childNode)});
}
}
}
super.removeSelectionPaths(new TreePath[]{parent});
}
public TreeModel getModel() {
return model;
}
}
public class CheckTreeCellRenderer extends JPanel implements TreeCellRenderer {
static final long serialVersionUID =0;
CheckTreeSelectionModel selectionModel;
private TreeCellRenderer delegate;
TristateCheckBox checkBox = new TristateCheckBox();
public CheckTreeCellRenderer(TreeCellRenderer delegate, CheckTreeSelectionModel selectionModel){
this.delegate = delegate;
this.selectionModel = selectionModel;
setLayout(new BorderLayout());
setOpaque(false);
checkBox.setOpaque(false);
}
public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus){
Component renderer = delegate.getTreeCellRendererComponent(tree, value, selected, expanded, leaf, row, hasFocus);
TreePath path = tree.getPathForRow(row);
if(path!=null)
{
if(selectionModel.isPathSelected(path, true))
{
checkBox.setState(checkBox.SELECTED);
//System.out.println(">>>>>> selected " );
}
else
{
checkBox.setState(checkBox.NOT_SELECTED);
//System.out.println("not selected ");
}
if(selectionModel.isPartiallySelected(path))
{
checkBox.setState(checkBox.DONT_CARE);
}
}
removeAll();
add(checkBox, BorderLayout.WEST);
add(renderer, BorderLayout.CENTER);
return this;
}
public TreeCellRenderer getDelegate() {
return delegate;
}
public void setDelegate(TreeCellRenderer delegate) {
this.delegate = delegate;
}
}
public class CheckTreeManager extends MouseAdapter implements TreeSelectionListener{
CheckTreeSelectionModel selectionModel;
private JTree tree = new JTree();
int hotspot = new JCheckBox().getPreferredSize().width;
public CheckTreeManager(JTree tree, CheckTreeSelectionModel checkTreeSelectionModel){
this.tree = tree;
if(checkTreeSelectionModel != null)
{
//selectionModel = new CheckTreeSelectionModel(tree.getModel());
selectionModel = checkTreeSelectionModel;
}
else
{
selectionModel = new CheckTreeSelectionModel(tree.getModel());
//System.out.println(selectionModel.getSelectionPath());
}
tree.setCellRenderer(new CheckTreeCellRenderer(tree.getCellRenderer(), selectionModel));
tree.addMouseListener(this);
selectionModel.addTreeSelectionListener(this);
}
public void mouseClicked(MouseEvent me){
//System.out.println("start...");
TreePath path = tree.getPathForLocation(me.getX(), me.getY());
//System.out.println(Arrays.asList(path));
if(path==null)
{
//System.out.println("path==null");
return;
}
if(me.getX()/1.2>tree.getPathBounds(path).x+hotspot)
{
//System.out.println("me.getX()/1.2>tree.getPathBounds(path).x+hotspot");
return;
}
boolean selected = selectionModel.isPathSelected(path, true);
selectionModel.removeTreeSelectionListener(this);
try{
if(selected)
{
//System.out.println("selected");
selectionModel.removeSelectionPath(path);
}
else
{
//System.out.println("not selected");
selectionModel.addSelectionPath(path);
}
}
finally
{
//System.out.println("finally");
selectionModel.addTreeSelectionListener(this);
tree.treeDidChange();
}
}
public CheckTreeSelectionModel getSelectionModel(){
return selectionModel;
}
public void setSelectionModel(CheckTreeSelectionModel selectionModel) {
this.selectionModel = selectionModel;
}
public void valueChanged(TreeSelectionEvent e){
tree.treeDidChange();
}
}
}
The most impotent method is:
boolean com.demo.tree.checkbox.AddCheckBoxToTree.CheckTreeSelectionModel.isPartiallySelected
that checks whether there is any unselected node in the subtree of given path (DONT_CARE).
And this is the result of what we did:
This answer is based on Santhosh Kumar's Weblog post with minor fixes.