Tree Nodes has White Outline/Border
Hi,
I'm using an ADF tree located inside a panelGroupLayout.
The panelGroupLayout has the background color "light blue".
At runtime each tree node is displayed with a surrounding white outline and that can only appear when you have a background color different than white (in my case the panelGroupLayout is "light blue").
Does anybody knows how to remove that outline? or to change its color?
Thanks,
Alain.
Here are the skin seletors
tr:tree Component
Icon Selectors
Name Description
af|tree::expanded-icon This icon is displayed before the expanded tree node.
af|tree::collapsed-icon This icon is displayed before the collapsed tree node.
af|tree::no-children-icon This icon is displayed instead of the expanded/collapsed icon, when the node has no children
af|tree::line-icon This icon is used as a vertical line between the nodes.
af|tree::line-middle-icon This icon is used as the horizontal line in the background of the expand/collapse icon of the node, in the case the node is not the last sibling of its parent node.
af|tree::line-last-icon This icon is used as the horizontal line in the background of the expand/collapse icon of the node, in the case the node is the last sibling of its parent node.
af|tree::node-icon This icon selector is used in the case the Node class has a getNodeType() method that returns the node type as string. The nodetype gets added to this selector, separated by a ':'. If the node is a container (has children) the following suffixes get added depending on the expanded/collapsed state: '-expanded' / '-collapsed'. e.g. "af|tree::node-icon:container-collapsed", "af|tree::node-icon:container-expanded", "af|tree::node-icon:noncontainer".
Trinidad properties
Name Description
-tr-show-lines Valid values are true or false (default true). Determines whether the tree lines are displayed or not. e.g., af|tree {-tr-show-lines:false} will not show the lines of the tree.Timo
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Hi All,
This is the seventh in the "Threadinar" series , please see Threadinar6 at
http://forum.sun.com/jive/thread.jspa?threadID=100601 for details
In this Threadinar we will focus on the
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Tree Component
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Additionally, you can work with the component in the Outline window, where the component and its child components are available as nodes. You can move a node from level to level easily in the Outline window, so you might want to work there if you are rearranging nodes. You can also add and delete tree nodes in the Outline window, just as in the Visual Designer.
The Tree component has properties that, among other things, enable you change the root node's displayed text, change the appearance of the text, specify if expanding or collapsing a node requires a trip to the server, and specify whether node selection should automatically open or close the tree. To set the Tree's properties, select the Tree component in your page and use the Tree Component Properties window.
The following Tutorial ("Using Tree Component") is very useful to learn using Tree components
http://developers.sun.com/prodtech/javatools/jscreator/learning/tutorials/2/sitemaptree.html
See Also the Technical Article - "Working with the Tree Component and Tree Node Actions"
http://developers.sun.com/prodtech/javatools/jscreator/reference/techart/2/tree_component.html
Tree Node Component
You can drag the Tree Node component from the Palette's Basic category to a Tree component or another tree node in the Visual Designer to create a node in a hierarchical tree structure, similar to the tree you see in the Outline window.
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Please share your comments, experiences, additional information, questions, feedback, etc. on these components.
------------------------------------------------------------------------------- --------------------One challenge I had experience was to make the tree
always expanded on all pages (I placed my tree menu
in a page fragment so I can just import it in my
pages).Did you solve this problem. It would be interesting to know what you did.
To expand a node you call setExpanded on the node. Here is some code from a tutorial that a coworker of mine is working on.
In the prerender method:
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// If expandedPersonId is null, then we are not coming back
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HttpServletRequest req =(HttpServletRequest)
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for (int loop =0; loop < cookies.length; loop++) {
if (cookies[loop].getName().equals
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HttpServletResponse response =(HttpServletResponse)
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getRequestBean1().setTripId(tripId);
} catch (Exception e) {
error("Can't convert node id to Integer: " +
selectedNode.getId().substring(4));
return null;
It would also be great if I can set the tree
readonly where the user cannot toggle the expand
property of the tree (hope this can be added to the
tree functionality). -
hi
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is there another way to drop on a node without any children (like in sapgui tree)?
thxhi,
If you described situation is right, i do think that you can modify the Context Node of Tree dynamically.
How to do it?
You know, the tree node has one property named "has children". So, i think you can add one attribute to your context node, and bind it with this property.
Then, you can use your Drag&Drop event, in which you can get so many parameters,such as 'ID','INDEX','Offset' ,etc. And i think you can make use of these parameters to get the the context element if necessary.
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area, you have to determine if you are over the
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BasicRootPaneUI has some code that can help determine
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import java.net.*;
import java.io.*;
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protected Thread bgThread;
protected boolean run = false;
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toolBar.add(cancel);
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treePane.setVerticalScrollBarPolicy(javax.swing.
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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);
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treeTab.setLayout(null);
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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();
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public static void main(String args[])
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*listen for the button presses and set the
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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
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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
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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
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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;
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return true;
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protected boolean testLink(URL url)
try
URLConnection connection = url.openConnection();
connection.connect();
return true;
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return false;
*this method is called when an error is
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public void URLError(URL url)
*this method is called when an email
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public void emailFound(String email)
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public String navMsg;
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//webspider.java
import java.util.*;
import java.net.*;
import java.io.*;
import javax.swing.text.*;
import javax.swing.text.html.*;
import javax.swing.tree.*;
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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 -
Determine if mouse is over tree node
hi.
I recently added some code from this forum on
highlighting a node when the mouse is over it.
I am taking this futher and setting a Border around the nodehowever it draws a border around every node.
I want to only draw the border when the mouse is over the node.
the example i got does this to set the foreground
((JLabel)result).setForeground(Color.red);
i do this to set the border
((JLabel)result).setBorder
(BorderFactory.createLineBorder(Color.black));
i ve tried getting the positions of both the mouse and the jlabel but am having trouble determining if the position of the mouse is within the position of the node in the tree.
Ive used methods like the contains method but it doesnt work for me . can anyone give me a hint as to how to see if the points of the mouse are on the Jlabel?This is very close to your solution. Last month, I implement ToolTip Text on every Tree Node so when Mouse goes on to the Node, It shows the Tool Tip Text. Have a look at this code and try to change it accordingly.
This code is in the Constructor in your class.
tree.setCellRenderer(new IDETreeCellRenderer());
tree.setToolTipText("");Class: IDETreeCellRenderer - Cell Renderer for the Tree
package tv.izone.ide.tree;
import java.awt.*;
import javax.swing.*;
import javax.swing.tree.*;
import tv.izone.core.*;
import tv.izone.ide.guiutilities.*;
import tv.izone.izml.data.*;
public class IDETreeCellRenderer
extends DefaultTreeCellRenderer {
DefaultTreeCellRenderer label;
* Override TreeCellRendererComponent, used for changing Tree Node for comments.
* @param tree Tree to be used
* @param value Value of the Node
* @param selected true, if selected
* @param expanded true, if expanded
* @param leaf true, if it is a leaf
* @param row Row Number
* @param hasFocus True, if has Focus
* @return Component, Tree
public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded,
boolean leaf, int row, boolean hasFocus) {
try {
label = (DefaultTreeCellRenderer)super.getTreeCellRendererComponent(tree, value, selected, expanded, leaf, row,
hasFocus);
label.setToolTipText(dataObject.getToolTipText());
// Instead of setToolTipText(), try setBackgroundColor() or setBorder()
return label;
} catch (Exception ex) {
// NullPointerException, usually comes at the start of the Application
// when the Tree is empty.
return this;
}Hope this Helps
Regards
Raheel -
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);
} -
Does an irrepariable "Invalid B-tree node" = unusable HD?
Hello,
I've decided my external LaCie drive has officially "died," but I want to know if it's truly unuseable or if I can just reformat it and start over (with it) again.
The Drive: a LaCie 300GB with one 40GB scratch partition and one 260GB backup partition.
What happened: After a about a week of erratic/slow disk access to the backup partiton (I'd shrugged it off as a full and fragmented drive), it finally just screeched to a snail's pace - so I could read/write to it, but, for example, copying 5MB file to/from it took about 3mins. I quickly backed up as much as I could off of it to another drive (100GB took 14hrs) and just as it finished copying the last file, it disappeared from my sidebar (though the scratch partition was still visible). I Disk Utility and could see it was unmounted and it's "name" had been reset to "disk5s3". Running the First Aid repair resulted in a quick "Invalid B-tree node size" ... "Error: The underlying task reported failure on exit".
Flash forward three days later: After unsuccessfully running Disk Warrior and Data Rescue for 20hrs (progress estimated it would take 400hrs to complete scan) - I gave up.
Sorry for the long setup, but my question is: can I just "zero" the drive and use it again, or is it "damaged" physically and suitable for a paperweight only. If it's usuable after reformatting, is there a way to test the hardware of the drive to assure it's stable?
Thanks for your time!can I just "zero" the drive and use it again, or is it "damaged" physically and suitable for a paperweight only
Like Dwight I doubt the drive is physically damaged but simply has a damaged catalogue b-tree. The only way you're going to find out though it to erase the drive and write zeros to it. Just be aware that everything on the drive will be lost (though I gather you know that already) if you do this. -
How to cut, copy and paste a tree node in JTree?????
Hi, Java GUI guru. Thank you for your help in advance.
I am working on a File Explorer project with JTree. There are cut, copy and paste item menus in my menu bar. I need three EventAction methods or classes to implements the three tasks. I tried to use Clipboard to copy and paste tree node. But I can not copy any tree node from my tree.
Are there any body has sample source code about cut, copy, and paste for tree? If possible, would you mind send me your sample source code to [email protected]
I would appreciate you very very much for your help!!!!
X.G.Hi, Paul Clapham:
Thank you for your quick answer.
I store the node in a DefaultMutableTreeNode variable, and assign it to another DefaultMutableTreeNode variable. I set up two classes (CopyNode and PasteNode). Here they are as follows:
//CopyNode class
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
public class CopyNode implements ActionListener{
private TreeList jtree;
String treeNodeName;
TreePath currentSelection;
DefaultMutableTreeNode currentNode;
public CopyNode(TreeList t){
jtree = t;
public void actionPerformed(ActionEvent e){
currentSelection = jtree.tree.getSelectionPath();
if(currentSelection != null){
currentNode = (DefaultMutableTreeNode)(currentSelection.getLastPathComponent());
treeNodeName = currentNode.toString();
//PasteNode class
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
public class PasteNode extends DefaultMutableTreeNode{
private TreeList jtree;
CopyNode copyNode;
public PasteNode(TreeList t){
jtree = t;
copyNode = new CopyNode(t);
public DefaultMutableTreeNode addObject(Object child){
DefaultMutableTreeNode parentNode = null;
TreePath parentPath = jtree.tree.getSelectionPath();
if(parentPath == null){
parentNode = jtree.root;
else{
parentNode = (DefaultMutableTreeNode)parentPath.getLastPathComponent();
return addObject(parentNode, child, true);
public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent, Object child, boolean shouldBeVisible){
DefaultMutableTreeNode childNode = copyNode.currentNode;
if(parent == null){
parent = jtree.root;
jtree.treemodel.insertNodeInto(childNode, parent, parent.getChildCount());
if(shouldBeVisible){
jtree.tree.scrollPathToVisible(new TreePath(childNode.getPath()));
return childNode;
I used these two classes objects in "actionPerformed(ActionEvent e)" methods in my tree:
//invoke copyNode
copyItem = new JMenuItem("Copy");
copyItem.addActionListener(copyNode);
//invoke pasteNode
pasteItem = new JMenuItem("Paste");
pasteItem.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
pasteName.addObject(copyName.treeNodeName);
When I run the drive code, making a copy some node from my tree list, I got bunch of error messages.
Can you figour out what is wrong in my two classes? If you have sample code, would you mind mail me for reference.
Thank you very much in advance.
X.G. -
How do we make a newly created tree-node the currently selected one?
Hi,
We are using JHeadstart 10.1.3 - Tree Generation. We are running into several issues with the trees, especially upon creation of new tree nodes. The Form in our Tree-Form page is Saved. At that point, we would like the new node to be the selected node in the tree (and also in the tree bean).
How do you believe can we do this? Right now, after creating the new node, we have no node selected - although it seems that the new node is selected as the normally synchronized form on the right shows that node.
Thanks for any suggestions!
LucasSteven,
I had not upgraded to Service Update 1 - was using Build 91. After upgrading, I see some difference, but not entirely the result I was looking for.
In a Tree-Form page on Employees, when I added an employee at the same level it still did not seem to be automatically selected.
Was wondering whether perhaps this has to do with the following comment from the source code:
// this happens when posting back to the same node level in the tree:
// the root node binding has no children in that case, causing derivation
// of focus row key to fail, have to find out why root node children
// are lost. Work around for now: return the focus row key as set by
// the user clikcing on the nodeIf not, can you explain what this comment refers to?
thanks for your help.
Lucas -
How to highlight Tree node with a diff color
I have created tree node and want to highlight Selected node with a different background color. Any Ideas how can we achieve that? -R
It's an item on page 4 of the application that the blog example is taken from. The tree query:
SELECT EMPLOYEE_ID AS ID
, MANAGER_ID AS PID
, CASE
WHEN EMPLOYEE_ID = :P4_EMPLOYEE_ID THEN
'<span style="color:white;background-color:blue;">'||
LAST_NAME||
'</span>'
ELSE
LAST_NAME
END AS NAME
, 'f?p=&APP_ID.:4:'||:SESSION||'::NO::P4_EMPLOYEE_ID:'||EMPLOYEE_ID AS LINK
, NULL AS A1
, NULL AS A2
FROM #OWNER#.EMPLOYEESgenerates leaf nodes that link to page 4, setting the value of P4_EMPLOYEE_ID. When page 4 is rendered, P4_EMPLOYEE_ID contains the ID of the clicked node, the page displays details of the employee with this ID, and the case expression in the tree query causes the corresponding display value to be highlighted.
See the sections Managing Session State Values and Using f?p Syntax to Link Pages in the documentation to understand how to set session state values using URLs.
http://download.oracle.com/docs/cd/E14373_01/appdev.32/e11838/concept.htm
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