Removing Tree Nodes
Hi
I have created a tree using the DefaultMutableTreeNode class, and I'm displaying it in a ScrollPane.
When I add a new node to an existing node, everything works ok. But when I go to remove that node afterwards, nothing happens. The node is still there (at least, it is still rendered there. it may not still be listed as a child of that parent).
Also, when I got to move that node to a different spot in the tree, it gets added to the new spot, but is not removed from the old spot. According to the api, it should be removed. But it isn't.
What am I missing here? Is there some step required to update the viewport to reflect the tree model? if so, why are nodes being added to the view correctly?
Or why doesn't it erase the nodes?
Anybody run into this problem before?
- Adam
Use the method 'removeNodeFromParent(MutableTreeNode node)' from the DefaultTreeModel class and the events are fired accordingly and you should the tree painted with the changes made.
// node is the DefaultMutableTreeNode being removed
((DefaultTreeModel) tree.getModel()).removeNodeFromParent( node );HTH
Similar Messages
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Can't remove a node from a tree
I am using the custom tree dataDescriptor provided in Flex live
doc. It works for creating the tree and add notes, however when I
try to remove a node from the tree it cant work. Does anyone have
any idea?
This is the code for MyCustomeTreeDataDescriptor.as
package
import mx.collections.ArrayCollection;
import mx.collections.CursorBookmark;
import mx.collections.ICollectionView;
import mx.collections.IViewCursor;
import mx.events.CollectionEvent;
import mx.events.CollectionEventKind;
import mx.controls.treeClasses.*;
public class MyCustomTreeDataDescriptor implements
ITreeDataDescriptor
// The getChildren method requires the node to be an Object
// with a children field.
// If the field contains an ArrayCollection, it returns the
field
// Otherwise, it wraps the field in an ArrayCollection.
public function getChildren(node:Object,
model:Object=null):ICollectionView
try
if (node is Object) {
if(node.children is ArrayCollection){
return node.children;
}else{
return new ArrayCollection(node.children);
catch (e:Error) {
trace("[Descriptor] exception checking for getChildren");
return null;
// The isBranch method simply returns true if the node is an
// Object with a children field.
// It does not support empty branches, but does support null
children
// fields.
public function isBranch(node:Object,
model:Object=null):Boolean {
try {
if (node is Object) {
if (node.children != null) {
return true;
catch (e:Error) {
trace("[Descriptor] exception checking for isBranch");
return false;
// The hasChildren method Returns true if the node actually
has children.
public function hasChildren(node:Object,
model:Object=null):Boolean {
if (node == null)
return false;
var children:ICollectionView = getChildren(node, model);
try {
if (children.length > 0)
return true;
catch (e:Error) {
return false;
// The getData method simply returns the node as an Object.
public function getData(node:Object,
model:Object=null):Object {
try {
return node;
catch (e:Error) {
return null;
// The addChildAt method does the following:
// If the parent parameter is null or undefined, inserts
// the child parameter as the first child of the model
parameter.
// If the parent parameter is an Object and has a children
field,
// adds the child parameter to it at the index parameter
location.
// It does not add a child to a terminal node if it does not
have
// a children field.
public function addChildAt(parent:Object, child:Object,
index:int,
model:Object=null):Boolean {
var event:CollectionEvent = new
CollectionEvent(CollectionEvent.COLLECTION_CHANGE);
event.kind = CollectionEventKind.ADD;
event.items = [child];
event.location = index;
if (!parent) {
var iterator:IViewCursor = model.createCursor();
iterator.seek(CursorBookmark.FIRST, index);
iterator.insert(child);
else if (parent is Object) {
if (parent.children != null) {
if(parent.children is ArrayCollection) {
parent.children.addItemAt(child, index);
if (model){
model.dispatchEvent(event);
model.itemUpdated(parent);
return true;
else {
parent.children.splice(index, 0, child);
if (model)
model.dispatchEvent(event);
return true;
return false;
// The removeChildAt method does the following:
// If the parent parameter is null or undefined, removes
// the child at the specified index in the model.
// If the parent parameter is an Object and has a children
field,
// removes the child at the index parameter location in the
parent.
public function removeChildAt(parent:Object, child:Object,
index:int, model:Object=null):Boolean
var event:CollectionEvent = new
CollectionEvent(CollectionEvent.COLLECTION_CHANGE);
event.kind = CollectionEventKind.REMOVE;
event.items = [child];
event.location = index;
//handle top level where there is no parent
if (!parent)
var iterator:IViewCursor = model.createCursor();
iterator.seek(CursorBookmark.FIRST, index);
iterator.remove();
if (model)
model.dispatchEvent(event);
return true;
else if (parent is Object)
if (parent.children != undefined)
parent.children.splice(index, 1);
if (model)
model.dispatchEvent(event);
return true;
return false;
This is my tree definition:
<mx:Tree width="143" top="0" bottom="0" left="0"
height="100%"
id="publicCaseTree"
dataDescriptor="{new MyCustomTreeDataDescriptor()}"
dataProvider="{ac}"
defaultLeafIcon="@Embed('assets/caseIcon.png')"
change="publicTreeChanged(event)"
dragEnabled="true"
dragMoveEnabled="false"/>
This is how I remove the selected node from the tree. When
Delete button is clicked, the doDeleteCase function is
exectuted.
public function publicTreeChanged(event:Event):void {
selectedNode =
publicCaseTree.dataDescriptor.getData(Tree(event.target).selectedItem,
ac);
public function doDeleteCase(event:Event):void{
publicCaseTree.dataDescriptor.removeChildAt(publicCaseTree.firstVisibleItem,
selectedNode, 0, ac);
Any help would be appreciated.Thanks.Finally I removed nodes from tree, but not sure I did in the
right way. Anybody encounter the same problem, please
discuss. -
I am trying to move a node while draging and dropping a node from one folder to other. It seams to be copying it but not moving it.
I have the following in the handle drop method in the tree. May I know what i can change to get this working?
public void handleDrop(Transferable transferable, DropTargetDropEvent event) throws Exception
Point location = event.getLocation();
//Get path of node where object being dropped
TreePath path = getClosestPathForLocation(location.x, location.y);
//No drop target
if(path == null)
System.err.println ("Rejected");
event.rejectDrop();
else
Transferable tr = event.getTransferable();
if(tr.isDataFlavorSupported(TransferableDataItem.Image_Tree_Node_Flavor))
System.out.println("Got transfered data");
IconNodeClass userObject = (IconNodeClass)tr.getTransferData(TransferableDataItem.Image_Tree_Node_Flavor);
IconNodeClass node = (IconNodeClass)path.getLastPathComponent();
IconNodeClass newNode = new IconNodeClass(userObject);
DefaultTreeModel model = (DefaultTreeModel)getModel();
IconNodeClass oldParentNode = (IconNodeClass)userObject.getParent();
Object oldParent = oldParentNode.getUserObject();
Object newParent = node.getUserObject();
if(oldParent.equals(newParent)) {
model.removeNodeFromParent(userObject);
model.insertNodeInto(newNode, node, 0);
updateUI();
else
System.err.println ("Rejected");
event.rejectDrop();
Thanks.Hi, I'm using DefaultMutableTreeNode. On detecting a condition, I'm trying to remove a node under my root along with its children using removeNodeFromParent(); My appln just freezes and it doesn't refresh. The same code used to work with jvm_1.3.1 and all I did waz just upgrade it to 1.4.1_03; This is happening on a RedHat 9.0 Linux platform (if this matters). I tried catching Exception & Error - nothin' gets printed out. This is the snippet.
DefaultTreeModel model= (DefaultTreeModel) gethardwareTree().getModel();
HardwareTreeNode node= (HardwareTreeNode) model.getRoot();
Enumeration enumChildren = node.children();
ArrayList nodeList = new ArrayList();
// This is done to avoid using Enumeration
// Enumeration is not elegant in handling removal from its collection
while (enumChildren.hasMoreElements())
nodeList.add(enumChildren.nextElement());
Iterator rootChildren = nodeList.iterator();
while (rootChildren.hasNext())
// HardwareTreeNode is extended from DefaultMutableTreeNode
HardwareTreeNode hostNode = (HardwareTreeNode) rootChildren.next();
HardwareTreeNodeInfo currentInfo= hostNode.getTreeNode();
try {
// The following sys.out does get printed System.out.println("About to Remove: "+hostNode);
model.removeNodeFromParent(hostNode);
// The following sys.out doesn't get printed and it hangs
System.out.println("Removed: "+hostNode);
catch (Exception ex)//ArrayIndexOutOfBounds
System.out.println(ex);
Code once - use it anywhere - unfortunately didn't work??
Pls. post Ur Xperienced thoughts. -
JSF Tree Node -Removing Green Patch
Dear Everyone, Anyone, Someone
I want to remove the green patch from the jsf tree component, it appears whenever we select the tree node, if we have given link from treenode, Can anyone suggest me some way.
Please do the needful help as soon as possible.
Regards,
Ashish Samantwant to remove the green patch from the jsf tree componentas u said ,, it is COMPONENET so this is a pre-made creator component that u cant chnage its attributes ,,
instead u can extract Theam.jar file and change the icons ,, u i didnt do it before ,, but u may be find what u want there,
hope this will help
good luck
Mohammed -
Remove root node from tree ...
hi all,
how can i delete the root node from a tree ???
i've tried:
tree.removeAll();
this removes all nodes from the tree except the root.
thanks.try this:
tree.setRootVisible(false);
Bye! -
Im using this line of code
var selectedNode:XML = XML(MyTree.selectedItem);
and i want to remove the selectedNode from the tree... The
only way that I have found to remove the node is to use these lines
of code which seems ridiculous just to remove the node
var parentChildren:XMLList =
XMLList(selectedNode.parent().children());
for (var i:int = 0; i < parentChildren.length(); i++) {
if (parentChildren
.@label == selectedNode.@label) {
delete parentChildren;
The only thing that I have found is to use the XMLNode object
because it has removeNode method... Except I can't use that either
because I get a warning when I try to cast the selectedItem into a
XMLNode.
Does anyone know how to simplify a deletion of a node.First, XMLNode is an object belonging to the old flash xml
style xml stuff,
and is not part of the new e4x XML class. Neither is
XMLDocument. In the new
XML, yo only have XML and XMLList to work with.
As far as delete, it is a bit of a PITA. I am amazed that we
have to use the
top-level object delete, but that is the case.
Now you should be able to just do:
delete selectedNode;
Try that first..However, looking back at my own code I
didn't do this.
Instead, I use this function:
//deletes the currently selected node
private function deleteSelectedNode():void
var nodeToDelete:XML = XML(treeData.selectedItem);
//reference to the
node to delete
var xlcParent:XMLListCollection = new
XMLListCollection(nodeToDelete.parent().children());
//collection of nodes
containing the node to delete
var iIndex:int = xlcParent.getItemIndex(nodeToDelete);
//index of node to
delete in collection
xlcParent.removeItemAt(iIndex); //remove the node
//treeData.invalidateList(); //refresh the tree
}//deleteSelectedNode
Maybe that technique will work for you.
Tracy -
Useful Code of the Day: Hideable Tree Nodes
Someone posted about how they could selectively hide tree nodes, and I already had this AbstractTreeModel class (which does some things DefaultTreeModel does and some it doesn't) and a concrete subclass for TreeNode objects, so I was thinking how one could do hideable nodes. So I came up with this solution.
There's 4 classes here:
- AbstractTreeModel is the base for the concrete TreeNodeTreeModel
- TreeNodeTreeModel extends AbstractTreeModel to support TreeNodes (DefautlMutableTreeNode, etc.)
- HideableMutableTreeNode which is a DefautlMutableTreeNode subclass which has a visible field (with is/set methods, of course).
- HideableTreeModel is the hideable model which is a subclass of TreeNodeTreeModel.
A HideableMutableTreeNode can be set invisible directly, but the tree still needs to be notified to update. So it's best to use the methods in HideableTreeModel which set a node's visibility which notify the tree of changes accordingly. Methods are also provided to check a full path's visibility or ensure a node including all parent nodes are visible.
A HideableTreeModel can take any TreeNode class, it doesn't have to be all HideableMutableTreeNodes, but only HideableMutableTreeNodes can be made invisible, of course. Any other TreeNode type would just be considered visible.
Hiding nodes works basically by making the tree think there's less nodes then there are. And to do this, the node counts and child index search just works by looping thru the parent's children. This has potential perfomance drawbacks of course, since one has to loop thru the node's children to get nodes every time. This could be alleviated by not supporting non-hideable nodes changing the internal maintenance of HideableMutableTreeNode contents. But I'll leave that to whoever really needs it. It shouldn't be a problem if there are are a relatively small set of child nodes in any given parent.
Also, note that the root node in the model cannot be made invisible, cuz it'd be redundant since JTree can be set to hide the root node.
// *** HideableTreeModel ***
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
* <code>HideableTreeModel</code> is an <code>TreeNodeTreeModel</code>
* implementation for <code>HideableMutableTreeNode</code> objects. The
* model can also take any other <code>javax.swing.tree.TreeNode</code>
* objects.
public class HideableTreeModel extends TreeNodeTreeModel {
* Creates a new <code>HideableTreeModel</code> object.
* @param root the root node
public HideableTreeModel(TreeNode root) {
super(root);
* Checks if the specified node is visible. A node can only be
* hidden if the node is an instance of <code>HideableMutableTreeNode</code>. <br />
* <br />
* Note that this only test the visibility of the specified node, not
* whether a parent node is visible. Use <code>isPathToNodeVisible(Object)</code>
* to check if the full path is visible.
* @param node the node
* @param true if the node is visible, else false
public boolean isNodeVisible(Object node) {
if(node != getRoot()) {
if(node instanceof HideableMutableTreeNode) {
return ((HideableMutableTreeNode)node).isVisible();
return true;
* Sets the specified node to be hidden. A node can only be made hidden
* if the node is an instance of <code>HideableMutableTreeNode</code>. <br />
* <br />
* Note that this method will notify the tree to reflect any changes to
* node visibility. <br />
* <br />
* Note that this will not alter the visibility of any nodes in the
* specified node's path to the root node. Use
* <code>ensurePathToNodeVisible(Object)</code> instead to make sure the
* full path down to that node is visible. <br />
* <br />
* Note that this method will notify the tree to reflect any changes to
* node visibility.
* @param node the node
* @param v true for visible, false for hidden
* @param true if the node's visibility could actually change, else false
public boolean setNodeVisible(Object node, boolean v) {
// can't hide root
if(node != getRoot()) {
if(node instanceof HideableMutableTreeNode) {
HideableMutableTreeNode n = (HideableMutableTreeNode)node;
// don't fix what ain't broke...
if(v != n.isVisible()) {
TreeNode parent = n.getParent();
if(v) {
// need to get index after showing...
n.setVisible(v);
int index = getIndexOfChild(parent, n);
super.nodeInserted(parent, n, index);
} else {
// need to get index before hiding...
int index = getIndexOfChild(parent, n);
n.setVisible(v);
super.nodeRemoved(parent, n, index);
return true;
return false;
* Checks if the specified node is visible and all nodes above it are
* visible.
* @param node the node
* @param true if the path is visible, else false
public boolean isPathToNodeVisible(Object node) {
Object[] path = getPathToRoot(node);
for(int i = 0; i < path.length; i++) {
if(!isNodeVisible(path)) {
return false;
return true;
* Sets the specified node and all nodes above it to be visible.
* Note that this method will notify the tree to reflect any changes to
* node visibility.
* @param node the node
public void ensurePathToNodeVisible(Object node) {
Object[] path = getPathToRoot(node);
for(int i = 0; i < path.length; i++) {
setNodeVisible(path[i], true);
* Returns the child of parent at index index in the parent's child array.
* @param parent the parent node
* @param index the index
* @return the child or null if no children
public Object getChild(Object parent, int index) {
if(parent instanceof TreeNode) {
TreeNode p = (TreeNode)parent;
for(int i = 0, j = -1; i < p.getChildCount(); i++) {
TreeNode pc = (TreeNode)p.getChildAt(i);
if(isNodeVisible(pc)) {
j++;
if(j == index) {
return pc;
return null;
* Returns the number of children of parent.
* @param parent the parent node
* @return the child count
public int getChildCount(Object parent) {
int count = 0;
if(parent instanceof TreeNode) {
TreeNode p = (TreeNode)parent;
for(int i = 0; i < p.getChildCount(); i++) {
TreeNode pc = (TreeNode)p.getChildAt(i);
if(isNodeVisible(pc)) {
count++;
return count;
* Returns the index of child in parent.
* @param parent the parent node
* @param child the child node
* @return the index of the child node in the parent
public int getIndexOfChild(Object parent, Object child) {
int index = -1;
if(parent instanceof TreeNode && child instanceof TreeNode) {
TreeNode p = (TreeNode)parent;
TreeNode c = (TreeNode)child;
if(isNodeVisible(c)) {
index = 0;
for(int i = 0; i < p.getChildCount(); i++) {
TreeNode pc = (TreeNode)p.getChildAt(i);
if(pc.equals(c)) {
return index;
if(isNodeVisible(pc)) {
index++;
return index;
* Main method for testing.
* @param args the command-line arguments
public static void main(String[] args) {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
HideableMutableTreeNode root = new HideableMutableTreeNode("root");
root.add(new HideableMutableTreeNode("child_1"));
final HideableMutableTreeNode c2 = new HideableMutableTreeNode("child_2");
c2.setVisible(false);
final HideableMutableTreeNode c2a = new HideableMutableTreeNode("child_2_A");
c2.add(c2a);
c2.add(new HideableMutableTreeNode("child_2_B"));
root.add(c2);
HideableMutableTreeNode c3 = new HideableMutableTreeNode("child_3");
HideableMutableTreeNode cC = new HideableMutableTreeNode("child_3_C");
cC.setVisible(false);
c3.add(cC);
c3.add(new HideableMutableTreeNode("child_3_D"));
root.add(c3);
root.add(new HideableMutableTreeNode("child_4"));
root.add(new HideableMutableTreeNode("child_5"));
DefaultMutableTreeNode c6 = new DefaultMutableTreeNode("child_6");
c6.add(new DefaultMutableTreeNode("child_6_A"));
c6.add(new DefaultMutableTreeNode("child_6_B"));
root.add(c6);
final HideableTreeModel model = new HideableTreeModel(root);
JTree tree = new JTree(model);
f.getContentPane().add(new JScrollPane(tree), BorderLayout.CENTER);
JButton b = new JButton("toggle");
b.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
model.setNodeVisible(c2, !model.isNodeVisible(c2));
//model.ensurePathToNodeVisible(c2a);
f.getContentPane().add(b, BorderLayout.SOUTH);
f.pack();
f.setSize(300, 500);
f.show();
// *** HideableMutableTreeNode ***
import javax.swing.*;
import javax.swing.tree.*;
* <code>HideableMutableTreeNode</code> is a <code>DefaultMutableTreeNode</code>
* implementation that works with <code>HideableTreeModel</code>.
public class HideableMutableTreeNode extends DefaultMutableTreeNode {
* The node is visible flag.
public boolean visible = true;
* Creates a tree node that has no parent and no children, but which
* allows children.
public HideableMutableTreeNode() {
super();
* Creates a tree node with no parent, no children, but which allows
* children, and initializes it with the specified user object.
* @param userObject - an Object provided by the user that
* constitutes the node's data
public HideableMutableTreeNode(Object userObject) {
super(userObject);
* Creates a tree node with no parent, no children, initialized with the
* specified user object, and that allows children only if specified.
* @param userObject - an Object provided by the user that
* constitutes the node's data
* @param allowsChildren - if true, the node is allowed to have child
* nodes -- otherwise, it is always a leaf node
public HideableMutableTreeNode(Object userObject, boolean allowsChildren) {
super(userObject, allowsChildren);
* Checks if the node is visible.
* @return true if the node is visible, else false
public boolean isVisible() {
return this.visible;
* Sets if the node is visible.
* @param v true if the node is visible, else false
public void setVisible(boolean v) {
this.visible = v;
// *** TreeNodeTreeModel ***
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
* <code>TreeNodeTreeModel</code> is an <code>AbstractTreeModel</code>
* implementation for <code>javax.swing.tree.TreeNode</code> objects.
public class TreeNodeTreeModel extends AbstractTreeModel {
* Creates a new <code>TreeNodeTreeModel</code> object.
* @param root the root node
public TreeNodeTreeModel(TreeNode root) {
super();
setRoot(root);
* Returns the parent of the child node.
* @param node the child node
* @return the parent or null if root
public Object getParent(Object node) {
if(node != getRoot() && (node instanceof TreeNode)) {
return ((TreeNode)node).getParent();
return null;
* Returns the child of parent at index index in the parent's child array.
* @param parent the parent node
* @param index the index
* @return the child or null if no children
public Object getChild(Object parent, int index) {
if(parent instanceof TreeNode) {
return ((TreeNode)parent).getChildAt(index);
return null;
* Returns the number of children of parent.
* @param parent the parent node
* @return the child count
public int getChildCount(Object parent) {
if(parent instanceof TreeNode) {
return ((TreeNode)parent).getChildCount();
return 0;
* Returns the index of child in parent.
* @param parent the parent node
* @param child the child node
* @return the index of the child node in the parent
public int getIndexOfChild(Object parent, Object child) {
if(parent instanceof TreeNode && child instanceof TreeNode) {
return ((TreeNode)parent).getIndex((TreeNode)child);
return -1;
* Returns true if node is a leaf.
* @param node the node
* @return true if the node is a leaf
public boolean isLeaf(Object node) {
if(node instanceof TreeNode) {
return ((TreeNode)node).isLeaf();
return true;
* Main method for testing.
* @param args the command-line arguments
public static void main(String[] args) {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
DefaultMutableTreeNode root = new DefaultMutableTreeNode("root");
root.add(new DefaultMutableTreeNode("child_1"));
DefaultMutableTreeNode c2 = new DefaultMutableTreeNode("child_2");
c2.add(new DefaultMutableTreeNode("child_2_A"));
c2.add(new DefaultMutableTreeNode("child_2_B"));
root.add(c2);
root.add(new DefaultMutableTreeNode("child_3"));
root.add(new DefaultMutableTreeNode("child_4"));
JTree tree = new JTree(new TreeNodeTreeModel(root));
f.getContentPane().add(new JScrollPane(tree));
f.pack();
f.setSize(300, 500);
f.show();
// *** AbstractTreeModel ***
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import java.text.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
public abstract class AbstractTreeModel implements TreeModel {
* The list of tree model listeners.
private Vector modelListeners = new Vector();
* The root object of the tree.
private Object root = null;
* Basic no-op constructor.
public AbstractTreeModel() {
* Gets the root object of the tree.
* @return the root object
public Object getRoot() {
return this.root;
* Sets the root object of the tree.
* @param r the root object
protected void setRoot(Object r) {
this.root = r;
* Gets the path to the root node for the specified object.
* @param node the root node
* @return the path to the object or <CODE>null</CODE>
public Object[] getPathToRoot(Object node) {
return getPathToRoot(node, 0);
* Gets the path to the root node for the specified object.
* @param node the root node
* @param i the current index
* @return the path to the object or <CODE>null</CODE>
private Object[] getPathToRoot(Object node, int i) {
Object anode[];
if(node == null) {
if(i == 0) {
return null;
anode = new Object[i];
} else {
i++;
if(node == getRoot()) {
anode = new Object[i];
} else {
anode = getPathToRoot(getParent(node), i);
anode[anode.length - i] = node;
return anode;
* Gets the parent object of the specified object. This method is not
* part of the <code>javax.swing.tree.TreeModel</code> interface, but is
* required to support the <code>getPathToRoot(Object)</code> method,
* which is widely used in this class. Therefore, it is important to
* correctly implement this method.
* @param obj the object
* @parma the parent object or null if no parent or invalid object
protected abstract Object getParent(Object obj);
* Adds a listener for the <CODE>TreeModelEvent</CODE> posted after the
* tree changes.
* @param l the tree model listener
public void addTreeModelListener(TreeModelListener l) {
modelListeners.addElement(l);
* Removes a listener previously added with addTreeModelListener().
* @param l the tree model listener
public void removeTreeModelListener(TreeModelListener l) {
modelListeners.removeElement(l);
* Forces the tree to reload. This is useful when many changes occur
* under the root node in the tree structure.
* <b>NOTE:</b> This will cause the tree to be collapsed. To maintain
* the expanded nodes, see the <code>getExpandedPaths(JTree)</code>
* and <code>expandPaths(JTree, ArrayList)</code> methods.
* @see #getExpandedPaths(JTree)
* @see #expandPaths(JTree, ArrayList)
public void reload() {
reload(getRoot());
* Forces the tree to repaint. This is useful when many changes occur
* under a specific node in the tree structure.
* <b>NOTE:</b> This will cause the tree to be collapsed below the
* updated node.
* @param node the node that changed
public void reload(Object node) {
if(node != null) {
TreePath tp = new TreePath(getPathToRoot(node));
fireTreeStructureChanged(new TreeModelEvent(this, tp));
* Messaged when the user has altered the value for the item identified
* by <CODE>path</CODE> to <CODE>newValue</CODE>.
* @param path the path to the changed object
* @param newValue the new value
public void valueForPathChanged(TreePath path, Object newValue) {
nodeChanged(path.getLastPathComponent());
* Notifies the tree that nodes were inserted. The index is looked up
* automatically.
* @param node the parent node
* @param child the inserted child node
public void nodeInserted(Object node, Object child) {
nodeInserted(node, child, -1);
* Notifies the tree that nodes were inserted.
* @param node the parent node
* @param child the inserted child node
* @param index the index of the child
public void nodeInserted(Object node, Object child, int index) {
if(index < 0) {
index = getIndexOfChild(node, child);
if(node != null && child != null && index >= 0) {
TreePath tp = new TreePath(getPathToRoot(node));
int[] ai = { index };
Object[] ac = { child };
fireTreeNodesInserted(new TreeModelEvent(this, tp, ai, ac));
* Notifies the tree that nodes were removed. The index is required
* since by this point, the object will no longer be in the tree.
* @param node the parent node
* @param child the removed child node
* @param index the index of the child
public void nodeRemoved(Object node, Object child, int index) {
if(node != null && child != null && index >= 0) {
TreePath tp = new TreePath(getPathToRoot(node));
int[] ai = { index };
Object[] ac = { child };
fireTreeNodesRemoved(new TreeModelEvent(this, tp, ai, ac));
* Notifies the tree that a node was changed.
* @param node the changed node
public void nodeChanged(Object node) {
if(node != null) {
TreePath tp = new TreePath(getPathToRoot(node));
fireTreeNodesChanged(new TreeModelEvent(this, tp, null, null));
* Fires "tree nodes changed" events to all listeners.
* @param event the tree model event
protected void fireTreeNodesChanged(TreeModelEvent event) {
for(int i = 0; i < modelListeners.size(); i++) {
((TreeModelListener)modelListeners.elementAt(i)).treeNodesChanged(event);
* Fires "tree nodes inserted" events to all listeners.
* @param event the tree model event
protected void fireTreeNodesInserted(TreeModelEvent event) {
for(int i = 0; i < modelListeners.size(); i++) {
((TreeModelListener)modelListeners.elementAt(i)).treeNodesInserted(event);
* Fires "tree nodes removed" events to all listeners.
* @param event the tree model event
protected void fireTreeNodesRemoved(TreeModelEvent event) {
for(int i = 0; i < modelListeners.size(); i++) {
((TreeModelListener)modelListeners.elementAt(i)).treeNodesRemoved(event);
* Fires "tree structure changed" events to all listeners.
* @param event the tree model event
protected void fireTreeStructureChanged(TreeModelEvent event) {
for(int i = 0; i < modelListeners.size(); i++) {
((TreeModelListener)modelListeners.elementAt(i)).treeStructureChanged(event);
* Records the list of currently expanded paths in the specified tree.
* This method is meant to be called before calling the
* <code>reload()</code> methods to allow the tree to store the paths.
* @param tree the tree
* @param pathlist the list of expanded paths
public ArrayList getExpandedPaths(JTree tree) {
ArrayList expandedPaths = new ArrayList();
addExpandedPaths(tree, tree.getPathForRow(0), expandedPaths);
return expandedPaths;
* Adds the expanded descendants of the specifed path in the specified
* tree to the internal expanded list.
* @param tree the tree
* @param path the path
* @param pathlist the list of expanded paths
private void addExpandedPaths(JTree tree, TreePath path, ArrayList pathlist) {
Enumeration enum = tree.getExpandedDescendants(path);
while(enum.hasMoreElements()) {
TreePath tp = (TreePath)enum.nextElement();
pathlist.add(tp);
addExpandedPaths(tree, tp, pathlist);
* Re-expands the expanded paths in the specified tree. This method is
* meant to be called before calling the <code>reload()</code> methods
* to allow the tree to store the paths.
* @param tree the tree
* @param pathlist the list of expanded paths
public void expandPaths(JTree tree, ArrayList pathlist) {
for(int i = 0; i < pathlist.size(); i++) {
tree.expandPath((TreePath)pathlist.get(i));Hey
I'm not trying to show anyone up here, but having just built a tree model for displaying an XML document in a tree, I thought this seemed like a neat exercise.
I implemented this very differently from the @OP. I only have one class, HiddenNodeTreeModel. All the hidden node data is stored in the model itself in my class. The advantage of what I've created is it will work with any TreeModel. The disadvantage is that I think it's not going to be very scalable - the additional computing to get the number of child nodes and to adjust indexes is heavy. So if you need a scalable solution definitely don't use this.
Anyway here you go
HiddenNodeTreeModel.java
======================
package tjacobs.ui.tree;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JTree;
import javax.swing.event.TreeModelListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;
import tjacobs.ui.WindowUtilities;
public class HiddenNodeTreeModel implements TreeModel {
TreeModel mModel;
ArrayList<Object> mHidden = new ArrayList<Object>();
public HiddenNodeTreeModel (TreeModel model) {
mModel = model;
public void addTreeModelListener(TreeModelListener arg0) {
mModel.addTreeModelListener(arg0);
private ArrayList<Integer> getHiddenChildren(Object parent) {
ArrayList<Integer> spots = new ArrayList<Integer>();
Iterator _i = mHidden.iterator();
while (_i.hasNext()) {
Object hidden = _i.next();
int idx = mModel.getIndexOfChild(parent, hidden);
if (idx != -1) {
spots.add(idx);
return spots;
public Object getChild(Object arg0, int index) {
ArrayList<Integer> spots = getHiddenChildren(arg0);
Collections.sort(spots);
Iterator<Integer> _i = spots.iterator();
while (_i.hasNext()) {
int num = _i.next();
if (num <= index) {
index++;
return mModel.getChild(arg0, index);
public int getChildCount(Object arg0) {
ArrayList list = getHiddenChildren(arg0);
System.out.println("size = " + list.size());
return mModel.getChildCount(arg0) - list.size();
public int getIndexOfChild(Object arg0, Object arg1) {
int index = mModel.getIndexOfChild(arg0, arg1);
ArrayList<Integer> spots = getHiddenChildren(arg0);
Collections.sort(spots);
Iterator<Integer> _i = spots.iterator();
int toSub = 0;
while (_i.hasNext()) {
int num = _i.next();
if (num <= index) {
toSub++;
return index - toSub;
public Object getRoot() {
// TODO Auto-generated method stub
return mModel.getRoot();
public boolean isLeaf(Object arg0) {
// TODO Auto-generated method stub
return mModel.isLeaf(arg0);
public void removeTreeModelListener(TreeModelListener arg0) {
mModel.removeTreeModelListener(arg0);
public void valueForPathChanged(TreePath arg0, Object arg1) {
mModel.valueForPathChanged(arg0, arg1);
public void hideNode(Object node) {
if (node instanceof TreePath) {
node = ((TreePath)node).getLastPathComponent();
mHidden.add(node);
public void showNode(Object node) {
mHidden.remove(node);
public void showAll() {
mHidden.clear();
* @param args
public static void main(String[] args) {
// TODO Auto-generated method stub
DefaultMutableTreeNode A = new DefaultMutableTreeNode("A");
DefaultMutableTreeNode B = new DefaultMutableTreeNode("B");
DefaultMutableTreeNode C = new DefaultMutableTreeNode("C");
DefaultMutableTreeNode D = new DefaultMutableTreeNode("D");
DefaultMutableTreeNode E = new DefaultMutableTreeNode("E");
DefaultMutableTreeNode F = new DefaultMutableTreeNode("F");
A.add(B);
B.add(C);
B.add(D);
B.add(E);
E.add(F);
DefaultTreeModel model = new DefaultTreeModel(A);
final HiddenNodeTreeModel hmodel = new HiddenNodeTreeModel(model);
final JTree tree = new JTree(hmodel);
JFrame jf = new JFrame("HiddenNodeTreeModel Test");
jf.add(tree);
JMenuBar bar = new JMenuBar();
jf.setJMenuBar(bar);
JMenu menu = new JMenu("Options");
bar.add(menu);
final JMenuItem hide = new JMenuItem("Hide");
final JMenuItem show = new JMenuItem("ShowAll");
menu.add(hide);
menu.add(show);
ActionListener al = new ActionListener() {
public void actionPerformed(ActionEvent ae) {
if (ae.getSource() == hide) {
hmodel.hideNode(tree.getSelectionPath());
tree.updateUI();
else {
hmodel.showAll();
tree.updateUI();
hide.addActionListener(al);
show.addActionListener(al);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jf.setBounds(100,100,100,100);
jf.setVisible(true);
} -
Help with building a JTree using tree node and node renderers
Hi,
I am having a few problems with JTree's. basically I want to build JTree from a web spider. The webspide searches a website checking links and stores the current url that is being processed as a string in the variable msg. I wan to use this variable to build a JTree in a new class and then add it to my GUI. I have created a tree node class and a renderer node class, these classes are built fine. can someone point me in the direction for actually using these to build my tree in a seperate class and then displaying it in a GUI class?
*nodeRenderer.java
import javax.swing.*;
import javax.swing.tree.*;
import java.awt.*;
import java.net.*;
public class nodeRenderer extends DefaultTreeCellRenderer
implements TreeCellRenderer
public static Icon icon= null;
public nodeRenderer() {
icon = new ImageIcon(getClass().getResource("icon.gif"));
public Component getTreeCellRendererComponent(
JTree tree,
Object value,
boolean sel,
boolean expanded,
boolean leaf,
int row,
boolean hasFocus) {
super.getTreeCellRendererComponent(
tree, value, sel,
expanded, leaf, row,
hasFocus);
treeNode node = (treeNode)(((DefaultMutableTreeNode)value).getUserObject());
if(icon != null) // set a custom icon
setOpenIcon(icon);
setClosedIcon(icon);
setLeafIcon(icon);
return this;
*treeNode.java
*this is the class to represent a node
import javax.swing.*;
import javax.swing.tree.*;
import java.util.*;
import java.net.*;
* Class used to hold information about a web site that has
* been searched by the spider class
public class treeNode
*Url from the WebSpiderController Class
*that is currently being processed
public String msg;
treeNode(String urlText)
msg = urlText;
String getUrlText()
return msg;
//gui.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import java.net.*;
import java.io.*;
import java.util.*;
public class gui extends JFrame implements Runnable
*declare variable, boolean
*thread, a object and a center
*pane
protected URL urlInput;
protected Thread bgThread;
protected boolean run = false;
protected WebSpider webSpider;
public gui()
*create the gui here
setTitle("Testing Tool");
setSize(600,600);
//add Buttons to the tool bar
start.setText("Start");
start.setActionCommand("Start");
toolBar.add(start);
ButtonListener startListener = new ButtonListener();
start.addActionListener(startListener);
cancel.setText("Cancel");
cancel.setActionCommand("Cancel");
toolBar.add(cancel);
ButtonListener cancelListener = new ButtonListener();
cancel.addActionListener(cancelListener);
close.setText("Close");
close.setActionCommand("Close");
toolBar.add(close);
ButtonListener closeListener = new ButtonListener();
close.addActionListener(closeListener);
//creat a simple form
urlLabel.setText("Enter URL:");
urlLabel.setBounds(100,36,288,24);
formTab.add(urlLabel);
url.setBounds(170,36,288,24);
formTab.add(url);
current.setText("Currently Processing: ");
current.setBounds(100,80,288,24);
formTab.add(current);
//add scroll bars to the error messages screen and website structure
errorPane.setAutoscrolls(true);
errorPane.setHorizontalScrollBarPolicy(javax.swing.
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
errorPane.setVerticalScrollBarPolicy(javax.swing.
ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
errorPane.setOpaque(true);
errorTab.add(errorPane);
errorPane.setBounds(0,0,580,490);
errorText.setEditable(false);
errorPane.getViewport().add(errorText);
errorText.setBounds(0,0,600,550);
treePane.setAutoscrolls(true);
treePane.setHorizontalScrollBarPolicy(javax.swing.
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
treePane.setVerticalScrollBarPolicy(javax.swing.
ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
treePane.setOpaque(true);
treeTab.add(treePane);
treePane.setBounds(0,0,580,490);
treeText.setEditable(false);
treePane.getViewport().add(treeText);
treeText.setBounds(0,0,600,550);
//create the tabbed window
centerPane.setBorder(new javax.swing.border.EtchedBorder());
formTab.setLayout(null);
errorTab.setLayout(null);
treeTab.setLayout(null);
centerPane.addTab("Search Parameters", formTab);
centerPane.addTab("Error Messages", errorTab);
centerPane.addTab("Website Structure", treeTab);
//add the tool bar and tabbed pane
getContentPane().add(toolBar, java.awt.BorderLayout.NORTH);
getContentPane().add(centerPane, java.awt.BorderLayout.CENTER);
*create the tool bar pane, a center pane, add the buttons,
*labels, tabs, a text field for user input here
javax.swing.JPanel toolBar = new javax.swing.JPanel();
javax.swing.JButton start = new javax.swing.JButton();
javax.swing.JButton cancel = new javax.swing.JButton();
javax.swing.JButton close = new javax.swing.JButton();
javax.swing.JTabbedPane centerPane = new javax.swing.JTabbedPane();
javax.swing.JPanel formTab = new javax.swing.JPanel();
javax.swing.JLabel urlLabel = new javax.swing.JLabel();
javax.swing.JLabel current = new javax.swing.JLabel();
javax.swing.JTextField url = new javax.swing.JTextField();
javax.swing.JPanel errorTab = new javax.swing.JPanel();
javax.swing.JTextArea errorText = new javax.swing.JTextArea();
javax.swing.JScrollPane errorPane = new javax.swing.JScrollPane();
javax.swing.JPanel treeTab = new javax.swing.JPanel();
javax.swing.JTextArea treeText = new javax.swing.JTextArea();
javax.swing.JScrollPane treePane = new javax.swing.JScrollPane();
javax.swing.JTree searchTree = new javax.swing.JTree();
*show the gui
public static void main(String args[])
(new gui()).setVisible(true);
*listen for the button presses and set the
*boolean flag depending on which button is pressed
class ButtonListener implements ActionListener
public void actionPerformed(ActionEvent event)
Object object = event.getSource();
if (object == start)
run = true;
startActionPerformed(event);
if (object == cancel)
run = false;
startActionPerformed(event);
if (object == close)
System.exit(0);
*this method is called when the start or
*cancel button is pressed.
void startActionPerformed (ActionEvent event)
if (run == true && bgThread == null)
bgThread = new Thread(this);
bgThread.start();
if (run == false && bgThread != null)
webSpider.cancel();
*this mehtod will start the background thred.
*the background thread is required so that the
*GUI is still displayed
public void run()
try
webSpider = new WebSpider(this);
webSpider.clear();
urlInput = new URL(url.getText());
webSpider.addURL(urlInput);
webSpider.run();
bgThread=null;
catch (MalformedURLException e)
addressError addErr = new addressError();
addErr.addMsg = "URL ERROR - PLEASE CHECK";
SwingUtilities.invokeLater(addErr);
*this method is called by the web spider
*once a url is found. Validation of navigation
*happens here.
public boolean urlFound(URL urlInput,URL url)
CurrentlyProcessing pro = new CurrentlyProcessing();
pro.msg = url.toString();
SwingUtilities.invokeLater(pro);
if (!testLink(url))
navigationError navErr = new navigationError();
navErr.navMsg = "Broken Link "+url+" caused on "+urlInput+"\n";
return false;
if (!url.getHost().equalsIgnoreCase(urlInput.getHost()))
return false;
else
return true;
*this method is called internally to check
*that a link works
protected boolean testLink(URL url)
try
URLConnection connection = url.openConnection();
connection.connect();
return true;
catch (IOException e)
return false;
*this method is called when an error is
*found.
public void URLError(URL url)
*this method is called when an email
*address is found
public void emailFound(String email)
/*this method will update any errors found inc
*address errors and broken links
class addressError implements Runnable
public String addMsg;
public void run()
errorText.append(addMsg);
current.setText("Currently Processing: "+ addMsg);
class navigationError implements Runnable
public String navMsg;
public void run()
errorText.append(navMsg);
*this method will update the currently
*processing field on the GUI
class CurrentlyProcessing implements Runnable
public String msg;
public void run()
current.setText("Currently Processing: " + msg );
//webspider.java
import java.util.*;
import java.net.*;
import java.io.*;
import javax.swing.text.*;
import javax.swing.text.html.*;
import javax.swing.tree.*;
import javax.swing.*;
*this class implements the spider.
public class WebSpider extends HTMLEditorKit
*make a collection of the URL's
protected Collection urlErrors = new ArrayList(3);
protected Collection urlsWaiting = new ArrayList(3);
protected Collection urlsProcessed = new ArrayList(3);
//report URL's to this class
protected gui report;
*this flag will indicate whether the process
*is to be cancelled
protected boolean cancel = false;
*The constructor
*report the urls to the wui class
public WebSpider(gui report)
this.report = report;
*get the urls from the above declared
*collections
public Collection getUrlErrors()
return urlErrors;
public Collection getUrlsWaiting()
return urlsWaiting;
public Collection getUrlsProcessed()
return urlsProcessed;
* Clear all of the collections.
public void clear()
getUrlErrors().clear();
getUrlsWaiting().clear();
getUrlsProcessed().clear();
*Set a flag that will cause the begin
*method to return before it is done.
public void cancel()
cancel = true;
*add the entered url for porcessing
public void addURL(URL url)
if (getUrlsWaiting().contains(url))
return;
if (getUrlErrors().contains(url))
return;
if (getUrlsProcessed().contains(url))
return;
/*WRITE TO LOG FILE*/
log("Adding to workload: " + url );
getUrlsWaiting().add(url);
*process a url
public void processURL(URL url)
try
/*WRITE TO LOGFILE*/
log("Processing: " + url );
// get the URL's contents
URLConnection connection = url.openConnection();
if ((connection.getContentType()!=null) &&
!connection.getContentType().toLowerCase().startsWith("text/"))
getUrlsWaiting().remove(url);
getUrlsProcessed().add(url);
log("Not processing because content type is: " +
connection.getContentType() );
return;
// read the URL
InputStream is = connection.getInputStream();
Reader r = new InputStreamReader(is);
// parse the URL
HTMLEditorKit.Parser parse = new HTMLParse().getParser();
parse.parse(r,new Parser(url),true);
catch (IOException e)
getUrlsWaiting().remove(url);
getUrlErrors().add(url);
log("Error: " + url );
report.URLError(url);
return;
// mark URL as complete
getUrlsWaiting().remove(url);
getUrlsProcessed().add(url);
log("Complete: " + url );
*start the spider
public void run()
cancel = false;
while (!getUrlsWaiting().isEmpty() && !cancel)
Object list[] = getUrlsWaiting().toArray();
for (int i=0;(i<list.length)&&!cancel;i++)
processURL((URL)list);
* A HTML parser callback used by this class to detect links
protected class Parser extends HTMLEditorKit.ParserCallback
protected URL urlInput;
public Parser(URL urlInput)
this.urlInput = urlInput;
public void handleSimpleTag(HTML.Tag t,MutableAttributeSet a,int pos)
String href = (String)a.getAttribute(HTML.Attribute.HREF);
if((href==null) && (t==HTML.Tag.FRAME))
href = (String)a.getAttribute(HTML.Attribute.SRC);
if (href==null)
return;
int i = href.indexOf('#');
if (i!=-1)
href = href.substring(0,i);
if (href.toLowerCase().startsWith("mailto:"))
report.emailFound(href);
return;
handleLink(urlInput,href);
public void handleStartTag(HTML.Tag t,MutableAttributeSet a,int pos)
handleSimpleTag(t,a,pos); // handle the same way
protected void handleLink(URL urlInput,String str)
try
URL url = new URL(urlInput,str);
if (report.urlFound(urlInput,url))
addURL(url);
catch (MalformedURLException e)
log("Found malformed URL: " + str);
*log the information of the spider
public void log(String entry)
System.out.println( (new Date()) + ":" + entry );
I have a seperate class for parseing the HTML. Any help would be greatly appreciated
mrvHi Sorry to be a pain again,
I have re worked the gui class so it looks like this now:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
import java.net.*;
import java.io.*;
import java.util.*;
public class gui extends JFrame implements Runnable
*declare variable, boolean
*thread, a object and a center
*pane
protected URL urlInput;
protected Thread bgThread;
protected boolean run = false;
protected WebSpider webSpider;
public String msgInfo;
public String brokenUrl;
public String goodUrl;
public String deadUrl;
protected DefaultMutableTreeNode rootNode;
protected DefaultTreeModel treeModel;
public gui()
*create the gui here
setTitle("Testing Tool");
setSize(600,600);
//add Buttons to the tool bar
start.setText("Start");
start.setActionCommand("Start");
toolBar.add(start);
ButtonListener startListener = new ButtonListener();
start.addActionListener(startListener);
cancel.setText("Cancel");
cancel.setActionCommand("Cancel");
toolBar.add(cancel);
ButtonListener cancelListener = new ButtonListener();
cancel.addActionListener(cancelListener);
close.setText("Close");
close.setActionCommand("Close");
toolBar.add(close);
ButtonListener closeListener = new ButtonListener();
close.addActionListener(closeListener);
//creat a simple form
urlLabel.setText("Enter URL:");
urlLabel.setBounds(100,36,288,24);
formTab.add(urlLabel);
url.setBounds(170,36,288,24);
formTab.add(url);
current.setText("Currently Processing: ");
current.setBounds(100,80,288,24);
formTab.add(current);
//add scroll bars to the error messages screen and website structure
errorPane.setAutoscrolls(true);
errorPane.setHorizontalScrollBarPolicy(javax.swing.
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
errorPane.setVerticalScrollBarPolicy(javax.swing.
ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
errorPane.setOpaque(true);
errorTab.add(errorPane);
errorPane.setBounds(0,0,580,490);
errorText.setEditable(false);
errorPane.getViewport().add(errorText);
errorText.setBounds(0,0,600,550);
treePane.setAutoscrolls(true);
treePane.setHorizontalScrollBarPolicy(javax.swing.
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
treePane.setVerticalScrollBarPolicy(javax.swing.
ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
treePane.setOpaque(true);
treeTab.add(treePane);
treePane.setBounds(0,0,580,490);
treeText.setEditable(false);
treePane.getViewport().add(treeText);
treeText.setBounds(0,0,600,550);
//JTree
// NEW CODE
rootNode = new DefaultMutableTreeNode("Root Node");
treeModel = new DefaultTreeModel(rootNode);
treeModel.addTreeModelListener(new MyTreeModelListener());
tree = new JTree(treeModel);
tree.setEditable(true);
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.setShowsRootHandles(true);
treeText.add(tree);
//create the tabbed window
centerPane.setBorder(new javax.swing.border.EtchedBorder());
formTab.setLayout(null);
errorTab.setLayout(null);
treeTab.setLayout(null);
centerPane.addTab("Search Parameters", formTab);
centerPane.addTab("Error Messages", errorTab);
centerPane.addTab("Website Structure", treeTab);
//add the tool bar and tabbed pane
getContentPane().add(toolBar, java.awt.BorderLayout.NORTH);
getContentPane().add(centerPane, java.awt.BorderLayout.CENTER);
*create the tool bar pane, a center pane, add the buttons,
*labels, tabs, a text field for user input here
javax.swing.JPanel toolBar = new javax.swing.JPanel();
javax.swing.JButton start = new javax.swing.JButton();
javax.swing.JButton cancel = new javax.swing.JButton();
javax.swing.JButton close = new javax.swing.JButton();
javax.swing.JTabbedPane centerPane = new javax.swing.JTabbedPane();
javax.swing.JPanel formTab = new javax.swing.JPanel();
javax.swing.JLabel urlLabel = new javax.swing.JLabel();
javax.swing.JLabel current = new javax.swing.JLabel();
javax.swing.JTextField url = new javax.swing.JTextField();
javax.swing.JPanel errorTab = new javax.swing.JPanel();
javax.swing.JTextArea errorText = new javax.swing.JTextArea();
javax.swing.JScrollPane errorPane = new javax.swing.JScrollPane();
javax.swing.JPanel treeTab = new javax.swing.JPanel();
javax.swing.JTextArea treeText = new javax.swing.JTextArea();
javax.swing.JScrollPane treePane = new javax.swing.JScrollPane();
javax.swing.JTree tree = new javax.swing.JTree();
*show the gui
public static void main(String args[])
(new gui()).setVisible(true);
*listen for the button presses and set the
*boolean flag depending on which button is pressed
class ButtonListener implements ActionListener
public void actionPerformed(ActionEvent event)
Object object = event.getSource();
if (object == start)
run = true;
startActionPerformed(event);
if (object == cancel)
run = false;
startActionPerformed(event);
if (object == close)
System.exit(0);
*this method is called when the start or
*cancel button is pressed.
void startActionPerformed (ActionEvent event)
if (run == true && bgThread == null)
bgThread = new Thread(this);
bgThread.start();
//new line of code
treeText.addObject(msgInfo);
if (run == false && bgThread != null)
webSpider.cancel();
*this mehtod will start the background thred.
*the background thread is required so that the
*GUI is still displayed
public void run()
try
webSpider = new WebSpider(this);
webSpider.clear();
urlInput = new URL(url.getText());
webSpider.addURL(urlInput);
webSpider.run();
bgThread = null;
catch (MalformedURLException e)
addressError addErr = new addressError();
addErr.addMsg = "URL ERROR - PLEASE CHECK";
SwingUtilities.invokeLater(addErr);
*this method is called by the web spider
*once a url is found. Validation of navigation
*happens here.
public boolean urlFound(URL urlInput,URL url)
CurrentlyProcessing pro = new CurrentlyProcessing();
pro.msg = url.toString();
SwingUtilities.invokeLater(pro);
if (!testLink(url))
navigationError navErr = new navigationError();
navErr.navMsg = "Broken Link "+url+" caused on "+urlInput+"\n";
brokenUrl = url.toString();
return false;
if (!url.getHost().equalsIgnoreCase(urlInput.getHost()))
return false;
else
return true;
*this method is returned if there is no link
*on a web page, e.g. there us a dead end
public void urlNotFound(URL urlInput)
deadEnd dEnd = new deadEnd();
dEnd.dEMsg = "No links on "+urlInput+"\n";
deadUrl = urlInput.toString();
*this method is called internally to check
*that a link works
protected boolean testLink(URL url)
try
URLConnection connection = url.openConnection();
connection.connect();
goodUrl = url.toString();
return true;
catch (IOException e)
return false;
*this method is called when an error is
*found.
public void urlError(URL url)
*this method is called when an email
*address is found
public void emailFound(String email)
/*this method will update any errors found inc
*address errors and broken links
class addressError implements Runnable
public String addMsg;
public void run()
current.setText("Currently Processing: "+ addMsg);
errorText.append(addMsg);
class navigationError implements Runnable
public String navMsg;
public void run()
errorText.append(navMsg);
class deadEnd implements Runnable
public String dEMsg;
public void run()
errorText.append(dEMsg);
*this method will update the currently
*processing field on the GUI
public class CurrentlyProcessing implements Runnable
public String msg;
//new line
public String msgInfo = msg;
public void run()
current.setText("Currently Processing: " + msg );
* NEW CODE
* NEED THIS CODE SOMEWHERE
* treeText.addObject(msgInfo);
public DefaultMutableTreeNode addObject(Object child)
DefaultMutableTreeNode parentNode = null;
TreePath parentPath = tree.getSelectionPath();
if (parentPath == null)
parentNode = rootNode;
else
parentNode = (DefaultMutableTreeNode)
(parentPath.getLastPathComponent());
return addObject(parentNode, child, true);
public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent,
Object child)
return addObject(parent, child, false);
public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent,
Object child,boolean shouldBeVisible)
DefaultMutableTreeNode childNode = new DefaultMutableTreeNode(child);
if (parent == null)
parent = rootNode;
treeModel.insertNodeInto(childNode, parent, parent.getChildCount());
if (shouldBeVisible)
tree.scrollPathToVisible(new TreePath(childNode.getPath()));
return childNode;
public class MyTreeModelListener implements TreeModelListener
public void treeNodesChanged (TreeModelEvent e)
DefaultMutableTreeNode node;
node = (DefaultMutableTreeNode)
(e.getTreePath().getLastPathComponent());
try
int index = e.getChildIndices()[0];
node = (DefaultMutableTreeNode)
(node.getChildAt(index));
catch (NullPointerException exc)
public void treeNodesInserted(TreeModelEvent e)
public void treeStructureChanged(TreeModelEvent e)
public void treeNodesRemoved(TreeModelEvent e)
I beleive that this line of code is required:
treeText.addObject(msgInfo);
I have placed it where the action events start the spider, but i keep getting this error:
cannot resolve symbol
symbol : method addObject (java.lang.String)
location: class javax.swing.JTextArea
treeText.addObject(msgInfo);
Also the jtree is not showing the window that I want it to and I am not too sure why. could you have a look to see why? i think it needs a fresh pair of eyes.
Many thanks
MrV -
How to trigger an ActionListener in different class on click of a tree node
Hi guyz,
There are three panels inside my main Frame
-->TopPanel,MiddlePanel and BottomPanel. I have a tree structure inside a panel. This panel along with couple more panels is in MiddlePanel. My main class is "mainClass.java". Inside that i have an actionListener for a specific button. I need to trigger that actionListener when i click one of the tree nodes in the panel i specified before. The problem is that my MiddlePanel is itself a different ".java" file which is being called in my "mainClass" when a specific button is clicked. There are different buttons in my "mainClass" file and for each one i am creating different MiddlePanels depending on the buttons clicked.
So, if i click the tree node, i need to remove the MiddlePanel and recreate the MiddlePanel(One that will be created when a different button in the mainClass file is clicked). i.e., i need to trigger the actionListener for that corresponding button. Is there a way to do it?use this code to call different panel by selecting tree node.....ok
import javax.swing.*;
import javax.swing.tree.*;
import java.awt.*;
import java.sql.SQLException;
import javax.swing.event.*;
class MainTree extends JFrame
private static final long serialVersionUID = 1L;
CardLayout cl = new CardLayout();
JPanel panel = new JPanel(cl);
public MainTree() throws Exception
JPanel blankPanel = new JPanel();
blankPanel.setBorder(BorderFactory.createTitledBorder("Blank Panel"));
panel.add(blankPanel,"0");
panel.add(blankPanel,BorderLayout.CENTER);
panel.setPreferredSize(new Dimension(800, 100));
setSize(1000, 700);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
// getContentPane().setLayout(new GridLayout(1,2));
getContentPane().setLayout(new BorderLayout());
ConfigTree test = new ConfigTree();
DefaultMutableTreeNode mainTree = (DefaultMutableTreeNode)test.buildTree();
JTree tree = new JTree(mainTree);
tree.setCellRenderer(new DefaultTreeCellRenderer(){
private static final long serialVersionUID = 1L;
public Component getTreeCellRendererComponent(JTree tree,Object value,
boolean sel,boolean expanded,boolean leaf,int row,boolean hasFocus){
JLabel lbl = (JLabel)super.getTreeCellRendererComponent(tree,value,sel,expanded,leaf,row,hasFocus);
NodeWithID node = (NodeWithID)((DefaultMutableTreeNode)value).getUserObject();
if(node.icon != null)lbl.setIcon(node.icon);
return lbl;
getContentPane().add(new JScrollPane(tree));
loadCardPanels((DefaultMutableTreeNode)((DefaultTreeModel)tree.getModel()).getRoot());
getContentPane().add(panel,BorderLayout.EAST);
getContentPane().add(blankPanel,BorderLayout.WEST);
// getContentPane().add(panel);
tree.addTreeSelectionListener(new TreeSelectionListener(){
public void valueChanged(TreeSelectionEvent tse){
NodeWithID node =(NodeWithID)((DefaultMutableTreeNode)((TreePath)tse.getPath())
.getLastPathComponent()).getUserObject();
if(node.nodePanel != null)
String cardLayoutID = node.ID;
cl.show(panel,cardLayoutID);
cl.show(panel,"0");
public void loadCardPanels(DefaultMutableTreeNode dmtn)
for(int x = 0; x < dmtn.getChildCount(); x++)
if(((DefaultMutableTreeNode)dmtn.getChildAt(x)).isLeaf() == false)
loadCardPanels((DefaultMutableTreeNode)dmtn.getChildAt(x));
NodeWithID node = (NodeWithID)((DefaultMutableTreeNode)dmtn.getChildAt(x)).getUserObject();
if(node.nodePanel != null)
String cardLayoutID = node.ID;
panel.add(cardLayoutID,node.nodePanel);
public static void main(String[] args) throws Exception{new MainTree().setVisible(true);}
class ConfigTree
public Object buildTree() throws Exception
NodeWithID n0 = new NodeWithID("HelpDesk","");
NodeWithID n1 = new NodeWithID("Administrator",n0.nodeName);
NodeWithID n2 = new NodeWithID("Report Form",n1.nodeName,new Tree().getContentPane());
NodeWithID n3 = new NodeWithID("Create User",n2.nodeName,new JPanel());
NodeWithID n4 = new NodeWithID("Unlock User",n2.nodeName,new unlockui().getContentPane());
NodeWithID n5 = new NodeWithID("List User",n2.nodeName,new JPanel());
NodeWithID n6 = new NodeWithID("Assign Role",n2.nodeName,new AssignRole());
NodeWithID n9 = new NodeWithID("Operator",n1.nodeName,new JPanel());
NodeWithID n10 = new NodeWithID("Create Ticket",n9.nodeName,new JPanel());
NodeWithID n11 = new NodeWithID("My Ticket",n9.nodeName,new JPanel());
NodeWithID n12 = new NodeWithID("All Ticket",n9.nodeName,new JPanel());
NodeWithID n13 = new NodeWithID("Event Viewer",n1.nodeName,new JPanel());
DefaultMutableTreeNode top = new DefaultMutableTreeNode(n0);
DefaultMutableTreeNode branch1 = new DefaultMutableTreeNode(n1);
top.add(branch1);
DefaultMutableTreeNode node1_b1 = new DefaultMutableTreeNode(n2);
DefaultMutableTreeNode n1_node1_b1 = new DefaultMutableTreeNode(n3);
DefaultMutableTreeNode n2_node1_b1 = new DefaultMutableTreeNode(n4);
DefaultMutableTreeNode n3_node1_b1 = new DefaultMutableTreeNode(n5);
DefaultMutableTreeNode n4_node1_b1 = new DefaultMutableTreeNode(n6);
branch1.add(node1_b1);
branch1.add(n1_node1_b1);
branch1.add(n2_node1_b1);
branch1.add(n3_node1_b1);
branch1.add(n4_node1_b1);
DefaultMutableTreeNode node4_b1 = new DefaultMutableTreeNode(n9);
DefaultMutableTreeNode n1_node4_b1 = new DefaultMutableTreeNode(n10);
DefaultMutableTreeNode n2_node4_b1 = new DefaultMutableTreeNode(n11);
DefaultMutableTreeNode n3_node4_b1 = new DefaultMutableTreeNode(n12);
node4_b1.add(n1_node4_b1);
node4_b1.add(n2_node4_b1);
node4_b1.add(n3_node4_b1);
DefaultMutableTreeNode node5_b1 = new DefaultMutableTreeNode(n13);
branch1.add(node1_b1);
branch1.add(node4_b1);
branch1.add(node5_b1);
return top;
class NodeWithID
String nodeName;
String ID;
JPanel nodePanel;
ImageIcon icon;
public NodeWithID(String nn,String parentName)
nodeName = nn;
ID = parentName+" - "+nodeName;
public NodeWithID(String nn,String parentName,Container container)
this(nn,parentName);
nodePanel = (JPanel) container;
nodePanel.setBorder(BorderFactory.createTitledBorder(ID + " Panel"));
public NodeWithID(String nn,String parentName,JPanel p, ImageIcon i)
this(nn,parentName,p);
icon = i;
public String toString(){return nodeName;}
} -
How to Remove a Node from JTree?
I want to remove a node from a JTree but the node may or maynot be visible.
My method takes a String which is the name of the node.
The nodes im using are DefaultMutableTreeNode
This is my code so far but it doesnt work.
public void removePerson(String pName)
TreePath node = tree.getNextMatch(pName,0,Position.Bias.Forward);
tree.expandPath(node);
tree.removeSelectionPath(node);
}Any Suggestions or ways which i could achive this?
Thank you,I don't think removeSelectionPath is what you want to use.
These should help:
[http://java.sun.com/j2se/1.4.2/docs/api/javax/swing/tree/DefaultTreeModel.html#removeNodeFromParent(javax.swing.tree.MutableTreeNode)|http://java.sun.com/j2se/1.4.2/docs/api/javax/swing/tree/DefaultTreeModel.html#removeNodeFromParent(javax.swing.tree.MutableTreeNode)]
[http://www.roseindia.net/java/example/java/swing/RemoveNodes.shtml|http://www.roseindia.net/java/example/java/swing/RemoveNodes.shtml] -
Custom tree node and DefaultTreeModel
Hello,
I would like to know if it's possible to use the following custom tree node with the DefaultTreeModel:
class MyTreeNode extends DefaultMutableTreeNode{
private String _argument = null;
public MyTreeNode(){}
public MyTreeNode(Object node, String argument){
super(node);
_argument = argument;
}I have tried it and it's not working but I think in theory it should work. Please correct me if I'm wrong.
The problem is that the tree won't display or insert the custom node when the insertNodeAt(...) method of
the DefaultTreeModel is called. I also tried using a custom tree listener and calling the .reload() method directly.
Any help will be very appreciated.
Thanks in advanced.Are you sure it's not being inserted into the model,
and just not being displayed?
Are you calling nodesWereInserted() after your
insertion?Thanks for your reply.
I've modified my app. so that the following method will populate the tree for testing only:
public void populateTree()
MyTreeNode root = new MyTreeNode("Root Node", "test");
DefaultTreeModel treeModel = new DefaultTreeModel(root);
JTree tree = new JTree(treeModel);
tree.setEditable(true);
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.setShowsRootHandles(true);
JScrollPane scrollPane = new JScrollPane(tree);
setLayout(new GridLayout(1,0));
add(scrollPane);
int childIdx[] = {0,1};
String p1Name = new String("Parent 1");
String p2Name = new String("Parent 2");
String c1Name = new String("Child 1");
String c2Name = new String("Child 2");
MyTreeNode p1 = new MyTreeNode(p1Name, "test");
MyTreeNode p2 = new MyTreeNode(p2Name, "test");
MyTreeNode c1 = new MyTreeNode(c1Name, "test");
MyTreeNode c2 = new MyTreeNode(c2Name, "test");
treeModel.insertNodeInto(p1, root, 0);
treeModel.insertNodeInto(p2, root, 1);
treeModel.nodesWereInserted(root, childIdx);
treeModel.insertNodeInto(c1, p1, 0);
treeModel.insertNodeInto(c2, p1, 1);
treeModel.nodesWereInserted(p1, childIdx);
treeModel.reload();
}And the result is that the "Root Node" will be displayed with "Parent1" and "Parent2" but "Parent1" won't have any children. Furthermore, if I try to remove "Parent1" using:
treeModel.removeNodeFromParent(p1);I will get an exception saying that node p1 has no parent, which suggests that the parent/child relation
is not being assigned by the model, even though the nodes (p1, p2) are displayed in the tree showing "Root node" as the parent. This is very strange.
Please help. -
Displaying the entire text of a tree node when the tree isn�t wide enough
Hi,
I have a JTree displayed in a JScrollPane, so there is a chance that some of the tree data may be hidden if the tree's width is insufficient, so when the user moves the cursor over a tree node whose text is not completely visible (cut off by the right edge of the scroll pane and/or window), a tooltip is displayed to show the entire node text. So far so good!
If the user double click a node in the tree a new window is supposed to be opened. This works fine if the tooltip hasn�t been displayed jet, but if it has then the user has to click 3 times to open the window.
The first time to remove the tooltip and the next 2 opens the window.
How can I awoid this?
Thanks!!!!
:-)LisaAny ideas, please?
-
JSF tree view GUI component and tree node actions
Hi,
I am new in using JSF and have a problem with my simple test application.
The application contains a tree view control with one static tree node and a separate text area. Clicking on the tree node shall fill the text area with the string 'hello'. Seems to be very simple, but it doesn't work.
What did I do?
First of all I use the Sun Java Studio Creator 2.
By double clicking on the tree node in the design window of the IDE a method called treeNode1_action() was created. I also added the String text to the session bean. treeNode1_Action() does not more than setting text='hello' ( getSessionBean().setText('hello'); ).
The jsp file contains the line
<ui:textArea binding="#{Page1.textArea}" id="textArea" style="height: 192px; left: 360px; top: 48px; position: absolute; width: 456px" text="#{SessionBean1.text}"/>, so the text of the text area is bound to the session property 'text'.
Running the application and clicking on the tree node does nothing except reloading the page (no 'hello' inside the text area).
Using the debugger showed me that the bean property text is set correctly to 'hello', also after reloading the page.
What did I do wrong?
What do I have to do to display 'hello' in the text area?
I would be glad for some good advice to solve my problem and looking forward for an answer.
Regards from germany
Matthiaswant to remove the green patch from the jsf tree componentas u said ,, it is COMPONENET so this is a pre-made creator component that u cant chnage its attributes ,,
instead u can extract Theam.jar file and change the icons ,, u i didnt do it before ,, but u may be find what u want there,
hope this will help
good luck
Mohammed -
Action Event Handler on Tree nodes
I have an actionListener event handler registered on a tree node as follows:
<af:tree value="#{bindings.SomeViewObj1.treeModel}" var="node" rowSelection="none" id="t1"
binding="#{EditFormBean.tree1}" displayRow="selected" summary="Tree"
partialTriggers=":::cb1 :::cb2">
<f:facet name="nodeStamp">
<af:panelGroupLayout id="pgl3">
<af:outputText value="#{node}" id="ot1"/>
<af:commandImageLink text="E" id="cil3" partialSubmit="true"
*actionListener="#{EditFormBean.onEdit}"* binding="#{EditFormBean.cmdImageLink}">
<af:setPropertyListener from="#{node.hiertType.structureDefName}" type="action"
to="#{viewScope.formView}"/>
<f:attribute name="node" value="#{node}"/>
</af:commandImageLink>
<af:commandImageLink text="A" id="cil1"/>
<af:commandImageLink text="D" id="cil2"/>
</af:panelGroupLayout>
</f:facet>
</af:tree>
I have at each node stamp facet a panelGroup Layout that contains the node value and a command Image link. The tree has two hierarchical levels. When I press the command Image link on the first tree noe level, the actioListener method in teh managed bean (EditFormBean.onEdit) gets called. When I press the same commandImage link on the second tree level, the same action listener does not get called. I need to get past this problem before I code the actionListener which needs to set the current row in the iterator based on the key selected on the tree node. I simply have a print statement in the action listener method which shows something when the first level command image link is clicked but does not print anything when the second level command image link is clicked.
I am using JDeveloper 11.1.2.1.0
There is also adf faces code around this snippet that uses an af:switcher facea component to display the appropriate form based on the nodee level in which the comman d image link is clicled but it is irrelevant to the problem I am getting.
Any help on that would be appreciatedHi,
hard to say . Didn't see this before. Can yoiu remove "binding="#{EditFormBean.cmdImageLink}"" from the command link. The tree stamps its children so that it doesn't make sense to keep a handle to the component instance
Frank -
How to hide a tree node from the GUI but still keep it in the tree model?
Hi, All
I used a JTree in my project in which I have a DefaultTreeModel to store all the tree structure and a JTree show it on the screen. But for some reason, I want to hide some of the nodes from the user, but I don't want to remove them from the tree model because later on I still need to use them.
I searched on the web, some people suggested method to hide the root node, but that's not appliable to my project because I want to hide some non-root nodes; Some people also suggested to collapse the parent node when there are child to hide, it is not appliable to me either, because there still some other childnodes (sibling of the node to hide) I want to show.
How can I hide some of the tree node from the user? Thanks for any information.
LindaHere's an example using a derivation of DefaultTreeModel that shows (or does not show) two types of Sneech (appologies to the good Dr Zeus) by overiding two methods on the model.
Now, there are many things wrong with this example (using instanceof, for example), but it's pretty tight and shows one way of doing what you want.
Note: to make it useful, you''d have to change the implementation of setShowStarBelliedSneeches() to do something more sophisticated than simply firing a structure change event on the root node. You'd want to find all the star bellied sneech nodes and call fireTreeNodesRemoved(). That way the tree would stay expanded rather than collapse as it does now.
import javax.swing.JTree;
import javax.swing.JScrollPane;
import javax.swing.JOptionPane;
import javax.swing.JCheckBox;
import javax.swing.JPanel;
import javax.swing.tree.TreePath;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.DefaultMutableTreeNode;
import java.awt.Dimension;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Enumeration;
class FilteredTree
private class PlainBelliedSneech {
public String toString() { return "Plain Bellied Sneech"; }
private class StarBelliedSneech {
public String toString() { return "Star Bellied Sneech"; }
private class FilteredTreeModel
extends DefaultTreeModel
private boolean mShowStarBelliedSneeches= true;
private DefaultMutableTreeNode mRoot;
FilteredTreeModel(DefaultMutableTreeNode root)
super(root);
mRoot= root;
public Object getChild(Object parent, int index)
DefaultMutableTreeNode node=
(DefaultMutableTreeNode) parent;
if (mShowStarBelliedSneeches)
return node.getChildAt(index);
int pos= 0;
for (int i= 0, cnt= 0; i< node.getChildCount(); i++) {
if (((DefaultMutableTreeNode) node.getChildAt(i)).getUserObject()
instanceof PlainBelliedSneech)
if (cnt++ == index) {
pos= i;
break;
return node.getChildAt(pos);
public int getChildCount(Object parent)
DefaultMutableTreeNode node=
(DefaultMutableTreeNode) parent;
if (mShowStarBelliedSneeches)
return node.getChildCount();
int childCount= 0;
Enumeration children= node.children();
while (children.hasMoreElements()) {
if (((DefaultMutableTreeNode) children.nextElement()).getUserObject()
instanceof PlainBelliedSneech)
childCount++;
return childCount;
public boolean getShowStarBelliedSneeches() {
return mShowStarBelliedSneeches;
public void setShowStarBelliedSneeches(boolean showStarBelliedSneeches)
if (showStarBelliedSneeches != mShowStarBelliedSneeches) {
mShowStarBelliedSneeches= showStarBelliedSneeches;
Object[] path= { mRoot };
int[] childIndices= new int[root.getChildCount()];
Object[] children= new Object[root.getChildCount()];
for (int i= 0; i< root.getChildCount(); i++) {
childIndices= i;
children[i]= root.getChildAt(i);
fireTreeStructureChanged(this, path, childIndices, children);
private FilteredTree()
final DefaultMutableTreeNode root= new DefaultMutableTreeNode("Root");
DefaultMutableTreeNode parent;
DefaultMutableTreeNode child;
for (int i= 0; i< 2; i++) {
parent= new DefaultMutableTreeNode(new PlainBelliedSneech());
root.add(parent);
for (int j= 0; j< 2; j++) {
child= new DefaultMutableTreeNode(new StarBelliedSneech());
parent.add(child);
for (int k= 0; k< 2; k++)
child.add(new DefaultMutableTreeNode(new PlainBelliedSneech()));
for (int j= 0; j< 2; j++)
parent.add(new DefaultMutableTreeNode(new PlainBelliedSneech()));
parent= new DefaultMutableTreeNode(new StarBelliedSneech());
root.add(parent);
for (int j= 0; j< 2; j++) {
child= new DefaultMutableTreeNode(new PlainBelliedSneech());
parent.add(child);
for (int k= 0; k< 2; k++)
child.add(new DefaultMutableTreeNode(new StarBelliedSneech()));
for (int j= 0; j< 2; j++)
parent.add(new DefaultMutableTreeNode(new StarBelliedSneech()));
final FilteredTreeModel model= new FilteredTreeModel(root);
JTree tree= new JTree(model);
tree.setShowsRootHandles(true);
tree.putClientProperty("JTree.lineStyle", "Angled");
tree.setRootVisible(false);
JScrollPane sp= new JScrollPane(tree);
sp.setPreferredSize(new Dimension(200,400));
final JCheckBox check= new JCheckBox("Show Star Bellied Sneeches");
check.setSelected(model.getShowStarBelliedSneeches());
check.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
model.setShowStarBelliedSneeches(check.isSelected());
JPanel panel= new JPanel(new BorderLayout());
panel.add(check, BorderLayout.NORTH);
panel.add(sp, BorderLayout.CENTER);
JOptionPane.showOptionDialog(
null, panel, "Sneeches on Beeches",
JOptionPane.DEFAULT_OPTION,
JOptionPane.PLAIN_MESSAGE,
null, new String[0], null
System.exit(0);
public static void main(String[] argv) {
new FilteredTree();
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