JTree expand
Hello,
I have got a JApplet which uses a JTree.
When a node has child nodes, i.e. when it could be expanded, I have the following problem:
If the node is selected (I use TreeSelectionModel.SINGLE_TREE_SELECTION), I can't expand it. However, if it isn't selected, I DO can.
Does somebody what could be happening?
Thank you very much
Sergio Ocio
Hi,
I'm using a JTree to display a recursive tree (jdev903preview). This works fine.
However, I have a few issues and questions regarding expanding the tree
(the +/- buttons):
1) If I set rootVisible to true, I see the accessor name in the tree root.
Setting rootVisible to false solves this. But this also removes the '+'
buttons of the first visible level in the tree! The user can only expand
these nodes by doubleclicking the icon. How do I get around this? I don't
want the accessor to be visible (why would I ever want to expose an internal
name to the user?), but I do want the '+' buttons.You may want to establish a custom cell-renderer for the Tree and take-out the "text" from the root node. Here's a sample:
jTree1.setCellRenderer(new JUTreeCellRenderer()
public java.awt.Component getTreeCellRendererComponent(javax.swing.JTree tree, Object value,
boolean sel,
boolean expanded,
boolean leaf, int row,
boolean hasFocus)
java.awt.Component cmp = super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf, row, hasFocus());
if (tree.getModel().getRoot() == value)
setText(""); //you can substitute any text you want here for the root node.
return cmp;
2) In the tree, the '+' buttons appear even for nodes which do not have children.
When the user clicks the '+' in front of an empty node, the '+' disappears, and
the icon changes from the 'map' icon to the 'leaf' icon. Why does it draw the
wrong icon and the '+' for empty nodes?This is because, JClient tree is bound to database and without executing individual nodes the binding does not know if the node is a leaf or a parent node. If you want to execute all nodes you may want to set the tree to expand all mode. I believe there's some swing call to "expand all nodes in a tree". BY default JClient only expands the first ViewObject in the hierarchy.
3) Is it possible to expand the entire tree by default?Again beware of the database query impact here.
Greetings,
Ivo
Similar Messages
-
Hi,
I was wondering if there is a way to have a tree created and rendered in the completely expanded form. I am thinking along the lines that is there is a setting or a method that by default does it.
If i am not mistaken there is a posting here in the forum to do this programatically.
Thank You,
-UdayDid you search for "JTree Expanded By Default" and saw that the answers were all about expanding the tree programatically:
http://forum.java.sun.com/thread.jspa?forumID=57&threadID=774838
and you wanted to make double-sure there was no other way to do it? -
JTree Expand All & Collapse All...
Hi All,
i hv two buttons "Expand All" & "Collapse All". If i press "Expand All" i should expand all the nodes in the all the root nodes(JTree).
If i press "Collapse All" i sh collapse all the entries in the JTree.
Is there any way to acheive this.
Thanks
ssHi!
You can try these methods where treeRoot is the root node of the tree:
* Collapses the function group tree.
public void collapseAll() {
for (int i = treeRoot.getChildCount(); i > 0; i--) {
tree.collapseRow(i);
* Collapses the function group tree.
public void expandAll() {
for (int i = treeRoot.getChildCount(); i > 0; i--) {
tree.expandRow(i);
/Malin -
JTree expanding problem(urgent)
hi all,
I am new to java and i am developing DMS where i use JTree to display folders. I am using vectors for displaying folder names and files. when i select a folder and create a folder under that, after creating it should highlight the folder where i am creating folder but in my project it is highlighting HOME folder.
I tried tree.expandPath, tree.setSelectionPath(treepath), tree.fireTreeExpanded(treepath); but its not working.
before this steps i am printed treepath, path is correctly printing. I dont know why the tree is not expanding....
please give me a solution.....tree.scrollPathToVisible(...)
-
JTree expand programatically is not working
jTree1.fireTreeExpanded(curTreePath);
expandAll(jTree1, curTreePath, true);
jTree1.expandPath(curTreePath);
jTree1.scrollPathToVisible(curTreePath);
jTree1.updateUI();
jTree1.setExpandsSelectedPaths(true);
jTree1.expandPath(curTreePath);
expandAll(jTree1, curTreePath, true);
for (int i = 0; i < jTree1.getRowCount(); i++)
jTree1.expandRow(i);
jTree1.validate();
jTree1.repaint();
Any help ?package so;
ToDo list
* Log timestamp and line number of at every exception.
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.sql.*;
import java.io.*;
import java.net.*;
import java.util.Enumeration;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
import javax.swing.tree.*;
public class SCM extends javax.swing.JFrame implements javax.swing.event.TreeExpansionListener, javax.swing.event.TreeModelListener, javax.swing.event.TreeWillExpandListener
Connection con = null;
java.sql.Statement stmt = null;
ResultSet rs = null;
PrintStream log = null;// File creation at local system, to record events, actions, errors and traces
javax.swing.tree.TreePath curTreePath = null;
/** Creates new form SCM */
public SCM()
//---------------------- Native LookandFeel Windows is expected.-------------------//
try
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
catch (Exception e)
System.out.println("Error setting native LAF: " + e);
//******************** Native LookandFeel Windows is expected.*******************//
// initialising GUI containers and controls
initComponents();
TableCellRenderer defaultRenderer;
defaultRenderer = jTable1.getDefaultRenderer(JLabel.class);
jTable1.setDefaultRenderer(JLabel.class, new Label_cell(defaultRenderer));
setState(javax.swing.JFrame.HIDE_ON_CLOSE);
jfc.setEnabled(false);
this.setSize(1024, 740);
jTree1.setSize(400, this.getWidth() / 4);
jTree1.setRootVisible(false);
jTree1.addTreeWillExpandListener(this); // Registering jTree1 to Expand listener.
jTree1.setCellRenderer(new TreeIconRenderer());
try
//-------Preparing Logger----------------//
FileOutputStream fos = new FileOutputStream(new File(System.getProperties().getProperty("user.home") + System.getProperties().getProperty("file.separator") + "SCM-Log_" + System.currentTimeMillis()));
log = new PrintStream(fos);
log.println("Started Time\t\t:" + new java.util.Date().getTime());
//*******Preparing Logger****************//
// Initialising jTree1 with the userid and preparing the xml and loading jTree1 with xml content,
// and expected to repeat the same while refreshing.
//----- Rendering images for the folders and files i.e. nodes and leaves of this tree
jTree1 = new XMLTree("215");
//******** Rendering images for the folders and files i.e. nodes and leaves of this tree
//Selection can only contain one path at a time, i.e. user is confined to reffere to only one node
//or leaf at a time
//jTree1.getSelectionModel().setSelectionMode(javax.swing.tree.TreeSelectionModel.SINGLE_TREE_SELECTION);
this.setTitle("ZIIC-ITG SCM");// Title can be changed at any time.
catch (IOException ioe)
ioe.printStackTrace(log); //logging Exception.
//This is first level action and to be decided to go further or not by exit(0);.
public boolean prepareCon() throws ClassNotFoundException
try
if (con != null && !con.isClosed())
return true;
else
Class.forName("oracle.jdbc.driver.OracleDriver");
java.sql.DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
con = java.sql.DriverManager.getConnection("jdbc:oracle:thin:@172.16.1.31:1521:soadb", "dms", "dms");
if (con != null && !con.isClosed())
return true;
catch (java.lang.ClassNotFoundException cnfe)
cnfe.printStackTrace(log);
catch (SQLException se)
se.printStackTrace(log);
if (con != null)
return true;
else
return true;
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents()
jPopupMenu1 = new javax.swing.JPopupMenu();
jSplitPane1 = new javax.swing.JSplitPane();
jScrollPane1 = new javax.swing.JScrollPane();
try
jTree1 = new XMLTree("215");
jScrollPane2 = new javax.swing.JScrollPane();
jTable1 = new javax.swing.JTable();
menuBar = new javax.swing.JMenuBar();
fileMenu = new javax.swing.JMenu();
openMenuItem = new javax.swing.JMenuItem();
saveMenuItem = new javax.swing.JMenuItem();
saveAsMenuItem = new javax.swing.JMenuItem();
exitMenuItem = new javax.swing.JMenuItem();
editMenu = new javax.swing.JMenu();
cutMenuItem = new javax.swing.JMenuItem();
copyMenuItem = new javax.swing.JMenuItem();
pasteMenuItem = new javax.swing.JMenuItem();
deleteMenuItem = new javax.swing.JMenuItem();
helpMenu = new javax.swing.JMenu();
contentsMenuItem = new javax.swing.JMenuItem();
aboutMenuItem = new javax.swing.JMenuItem();
//setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
}catch(Exception e){}
jTree1.setDoubleBuffered(true);
jTree1.setDragEnabled(true);
jTree1.setEditable(true);
jTree1.setFocusTraversalPolicyProvider(true);
jTree1.setInheritsPopupMenu(true);
jTree1.setInvokesStopCellEditing(true);
jTree1.setLargeModel(true);
jTree1.setMaximumSize(new java.awt.Dimension(250, 64));
jTree1.setPreferredSize(new java.awt.Dimension(200, 64));
jTree1.setVerifyInputWhenFocusTarget(false);
jTree1.addMouseListener(new java.awt.event.MouseAdapter()
public void mouseClicked(java.awt.event.MouseEvent evt)
jTree1MouseClicked(evt);
jTree1.addTreeExpansionListener(new javax.swing.event.TreeExpansionListener()
public void treeCollapsed(javax.swing.event.TreeExpansionEvent evt)
jTree1TreeCollapsed(evt);
public void treeExpanded(javax.swing.event.TreeExpansionEvent evt)
jTree1TreeExpanded(evt);
jTree1.addTreeSelectionListener(new javax.swing.event.TreeSelectionListener()
public void valueChanged(javax.swing.event.TreeSelectionEvent evt)
jTree1ValueChanged(evt);
jScrollPane1.setViewportView(jTree1);
jSplitPane1.setLeftComponent(jScrollPane1);
jScrollPane2.setAutoscrolls(true);
jScrollPane2.setDoubleBuffered(true);
jScrollPane2.setFocusCycleRoot(true);
jScrollPane2.setFocusTraversalPolicyProvider(true);
jScrollPane2.setInheritsPopupMenu(true);
jTable1.setModel(new javax.swing.table.DefaultTableModel(
new Object [][]
{null, null, null, null},
{null, null, null, null},
{null, null, null, null},
{null, null, null, null}
new String []
"Title 1", "Title 2", "Title 3", "Title 4"
jTable1.addMouseListener(new java.awt.event.MouseAdapter()
public void mouseClicked(java.awt.event.MouseEvent evt)
jTable1MouseClicked(evt);
jScrollPane2.setViewportView(jTable1);
jSplitPane1.setRightComponent(jScrollPane2);
fileMenu.setText("File");
openMenuItem.setText("Open");
fileMenu.add(openMenuItem);
saveMenuItem.setText("Save");
fileMenu.add(saveMenuItem);
saveAsMenuItem.setText("Save As ...");
fileMenu.add(saveAsMenuItem);
exitMenuItem.setText("Exit");
exitMenuItem.addActionListener(new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
exitMenuItemActionPerformed(evt);
fileMenu.add(exitMenuItem);
menuBar.add(fileMenu);
editMenu.setText("Edit");
cutMenuItem.setText("Cut");
editMenu.add(cutMenuItem);
copyMenuItem.setText("Copy");
editMenu.add(copyMenuItem);
pasteMenuItem.setText("Paste");
editMenu.add(pasteMenuItem);
deleteMenuItem.setText("Delete");
editMenu.add(deleteMenuItem);
menuBar.add(editMenu);
helpMenu.setText("Help");
contentsMenuItem.setText("Contents");
helpMenu.add(contentsMenuItem);
aboutMenuItem.setText("About");
helpMenu.add(aboutMenuItem);
menuBar.add(helpMenu);
setJMenuBar(menuBar);
org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createSequentialGroup()
.add(jSplitPane1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 390, Short.MAX_VALUE)
.addContainerGap())
layout.setVerticalGroup(
layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createSequentialGroup()
.add(jSplitPane1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 268, Short.MAX_VALUE)
.addContainerGap())
pack();
}// </editor-fold>
private void jTree1ValueChanged(javax.swing.event.TreeSelectionEvent evt)
try
curTreePath = evt.getPath();
//curTreePath.getPathCount();
//selectedNode = stPath.getPathComponent(stCount - 1);
//TODO add your handling code here:
if (prepareCon())
javax.swing.tree.TreePath path = evt.getPath();
DMETreeNode node = (DMETreeNode) path.getLastPathComponent();
try
if (node != null && (node.getSerial() + "").length() > 0)
//stmt = con.createStatement();
stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY);
rs = stmt.executeQuery("select serial, description, file_location, status, sheet, part, approvedby, locked, location, created_by from dms_files where owner=" + node.getSerial());
SCM_Tbl_model model = new SCM_Tbl_model();
model.setRs(rs);
//jTable1.setColumnModel(columnModel);
jTable1.setModel(model);
TableRowSorter<TableModel> sorter = new TableRowSorter<TableModel>(model);
jTable1.setRowSorter(sorter);
catch (Exception e)
e.printStackTrace();
catch (ClassNotFoundException ex)
ex.printStackTrace(log);
Logger.getLogger(SCM.class.getName()).log(Level.SEVERE, null, ex);
private void jTree1MouseClicked(java.awt.event.MouseEvent evt)
// TODO add your handling code here:
if (evt.getButton() == evt.BUTTON3)
jPopupMenu1.removeAll();
javax.swing.JMenuItem expandMI = new javax.swing.JMenuItem("Expand");
javax.swing.JMenuItem expandAllMI = new javax.swing.JMenuItem("Expand All");
javax.swing.JMenuItem find_folderMI = new javax.swing.JMenuItem("Find Folder");
final javax.swing.JMenuItem new_folderMI = new javax.swing.JMenuItem("New Folder");
javax.swing.JSeparator separator1 = new javax.swing.JSeparator();
jPopupMenu1.setSize(100, 200);
jPopupMenu1.add(expandMI);
jPopupMenu1.add(expandAllMI);
jPopupMenu1.add(separator1);
jPopupMenu1.add(find_folderMI);
jPopupMenu1.add(new_folderMI);
jPopupMenu1.setVisible(true);
jPopupMenu1.show(evt.getComponent(), evt.getX(), evt.getY());
//expandToLast(jTree1);
//jTree1.scrollPathToVisible(curTreePath);
//jTree1.fireTreeExpanded(curTreePath);
ActionListener menuOnTree = new ActionListener()
public void actionPerformed(ActionEvent e)
if (e.getSource().equals(new_folderMI))
DMETreeNode ch=new DMETreeNode("Child of "+((DMETreeNode)curTreePath.getLastPathComponent()).toString());
((DMETreeNode) curTreePath.getLastPathComponent()).add(ch);
jTree1.fireTreeExpanded(curTreePath);
expandAll(jTree1, curTreePath, true);
jTree1.expandPath(curTreePath);
jTree1.scrollPathToVisible(curTreePath);
jTree1.updateUI();
if (e.getActionCommand().trim().equalsIgnoreCase("Expand"))
jTree1.setExpandsSelectedPaths(true);
jTree1.expandPath(curTreePath);
expandAll(jTree1, curTreePath, true);
for (int i = 0; i < jTree1.getRowCount(); i++)
jTree1.expandRow(i);
jTree1.validate();
jTree1.repaint();
System.out.println(((DMETreeNode) curTreePath.getLastPathComponent()).getSerial());
expandToLast(jTree1);
System.out.println(jTree1.getModel().getRoot().toString());
((XMLTree)jTree1).expandAll(true);
expandToLast(jTree1);
expandMI.addActionListener(menuOnTree);
expandAllMI.addActionListener(menuOnTree);
find_folderMI.addActionListener(menuOnTree);
new_folderMI.addActionListener(menuOnTree);
public void expandAll(JTree tree, boolean expand)
TreeNode root = (TreeNode) tree.getModel().getRoot();
// Traverse tree from root
expandAll(tree, new TreePath(root), expand);
private void expandAll(JTree tree, TreePath parent, boolean expand)
// Traverse children
TreeNode node = (TreeNode) parent.getLastPathComponent();
if (node.getChildCount() >= 0)
for (Enumeration e = node.children(); e.hasMoreElements();)
TreeNode n = (TreeNode) e.nextElement();
TreePath path = parent.pathByAddingChild(n);
//System.out.println(path.toString());
expandAll(tree, path, expand);
// Expansion or collapse must be done bottom-up
if (expand)
tree.expandPath(parent);
else
tree.collapsePath(parent);
public void expandToLast(JTree tree)
// expand to the last leaf from the root
DefaultMutableTreeNode root;
root = (DefaultMutableTreeNode) tree.getModel().getRoot();
tree.scrollPathToVisible(new TreePath(root.getLastLeaf().getPath()));
//System.out.println(""+root.getLastLeaf().getPath().toString());
public void expandToLast(JTree tree)
TreeModel data = tree.getModel();
Object node = data.getRoot();
if (node == null)
return;
TreePath p = new TreePath(node);
while (true)
int count = data.getChildCount(node);
if (count == 0)
break;
node = data.getChild(node, count - 1);
p = p.pathByAddingChild(node);
tree.scrollPathToVisible(p);
private void jTree1TreeExpanded(javax.swing.event.TreeExpansionEvent evt)
// TODO add your handling code here:
System.out.println("@447");
private void jTree1TreeCollapsed(javax.swing.event.TreeExpansionEvent evt) {
// TODO add your handling code here:
private void exitMenuItemActionPerformed(java.awt.event.ActionEvent evt) {
System.exit(0);
@SuppressWarnings("static-access")
private void jTable1MouseClicked(java.awt.event.MouseEvent evt)
// TODO add your handling code here:
jPopupMenu1.removeAll();
jPopupMenu1.setVisible(true);
//Prepare Menu items based the event and the user, and the item clicked on i.e.
javax.swing.JMenuItem menuItem = new javax.swing.JMenuItem("Add A doc", KeyEvent.VK_T);
jPopupMenu1.add(menuItem);
ActionListener al = new ActionListener()
public void actionPerformed(ActionEvent e)
jfc.updateUI();
jfc.showOpenDialog(jTable1);
jTable1.setValueAt(jfc.getSelectedFile().getAbsolutePath(), jTable1.getSelectedRow(), jTable1.getSelectedColumn());
jfc.setDialogTitle("Choose only fmx files");
try
if (jfc.getSelectedFile().getAbsolutePath() != null)
java.io.File f = new java.io.File(jfc.getSelectedFile().getAbsolutePath());
if (f.exists())
// Start FTP process.
SCM_FTP ftp = new SCM_FTP();
ftp.connect("ziicsrv11", 21, "z11902", "ziicit");
ftp.bin();
// Change to a new working directory on the FTP server.
ftp.cwd("bin");
// Upload some files.
log.println("FTP Start: " + System.currentTimeMillis());
ftp.stor(f);
ftp.disconnect();
log.println("FTP Done: " + System.currentTimeMillis());
catch (java.io.IOException ioe)
log.println("File is not Found");
ioe.printStackTrace(log);
menuItem.addActionListener(al);
menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_1, ActionEvent.ALT_MASK));
menuItem.getAccessibleContext().setAccessibleDescription("This doesn't really do anything");
jPopupMenu1.setSize(100, 200);
if (evt.getButton() == evt.BUTTON3)//evt.isPopupTrigger()
jPopupMenu1.show(evt.getComponent(), evt.getX(), evt.getY());
* @param args the command line arguments
public static void main(String args[])
java.awt.EventQueue.invokeLater(new Runnable()
public void run()
SCM s = new SCM();
s.setVisible(true);
//s.setState(s.HIDE_ON_CLOSE);
s.setAlwaysOnTop(true);
SystemTrayTest st = new SystemTrayTest();
st.setControl(s);
st.showFrame();
// Variables declaration - do not modify
private javax.swing.JMenuItem aboutMenuItem;
private javax.swing.JMenuItem contentsMenuItem;
private javax.swing.JMenuItem copyMenuItem;
private javax.swing.JMenuItem cutMenuItem;
private javax.swing.JMenuItem deleteMenuItem;
private javax.swing.JMenu editMenu;
private javax.swing.JMenuItem exitMenuItem;
private javax.swing.JMenu fileMenu;
private javax.swing.JMenu helpMenu;
private javax.swing.JPopupMenu jPopupMenu1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JSplitPane jSplitPane1;
private javax.swing.JTable jTable1;
private javax.swing.JTree jTree1;
private javax.swing.JMenuBar menuBar;
private javax.swing.JMenuItem openMenuItem;
private javax.swing.JMenuItem pasteMenuItem;
private javax.swing.JMenuItem saveAsMenuItem;
private javax.swing.JMenuItem saveMenuItem;
// End of variables declaration
private javax.swing.JFileChooser jfc = new javax.swing.JFileChooser();
public void treeExpanded(TreeExpansionEvent event)
public void treeCollapsed(TreeExpansionEvent event)
public void treeNodesChanged(TreeModelEvent e)
public void treeNodesInserted(TreeModelEvent e)
public void treeNodesRemoved(TreeModelEvent e)
public void treeStructureChanged(TreeModelEvent e)
public void treeWillExpand(TreeExpansionEvent event) throws ExpandVetoException
public void treeWillCollapse(TreeExpansionEvent event) throws ExpandVetoException
} -
I have a very large jtree, that at it second level gets loaded from a JDOm file.
The problem is I am having a problem expanding all the nodes under a
particular node. I need an expandAll method. Nothing I have tried has
expanded beyond the child level.
After a few permutations my code right now is
public void expandAll(DefaultMutableTreeNode node)
Enumeration list = node.breadthFirstenumeraion();
while (list.hasMoreElements())
TreePath treePath = new
TreePath(((DefaultMutableTreeNode)list.nextElement()).getPath()))
tree_m.expandPath(treePath);
Am i missing something about expandPath?
I even use the code from JTree example to the reload the model.
But it still only shows the nodes children, not the children's children....etc.Hi!
You can try these methods where treeRoot is the root node of the tree:
* Collapses the function group tree.
public void collapseAll() {
for (int i = treeRoot.getChildCount(); i > 0; i--) {
tree.collapseRow(i);
* Collapses the function group tree.
public void expandAll() {
for (int i = treeRoot.getChildCount(); i > 0; i--) {
tree.expandRow(i);
/Malin -
How to make a Jtree expandable
Hi have a JTree and when I expand the tree and catch an exption hence not adding any children I would like the node that I have expanded to autamatically be collapsed, and ready for a future expand, as I have a situation were a node in the tree might not yet have any children (the children will be added dynamically).
I would like to handel the 9iexeption in such a way that the tree is ready for use and has the "+ sign available" to the user,
at the moomemt it thincks there are no chldren and has no "+ " or "-" sign so no future expand is posible
please help !!!!hentchocan wrote:
I want to make a JTree that has a TextArea nodes. So each child when expanded shows a text area containing some information . Can any one provide example of such behaviour .
Best Regards,Here the reply button works. -
Let's say a tree has 3 children, and each children has a hierarchy of subtrees. Is there any way to just expand one children and its subtrees??
root
|_A
|_SUBTREE
|_B
|_SUBTREE
|_C
|_SUBTREE
If I do the following, it will expand the whole big tree.
JTree tree;
//etc...
1) /** Expand the tree */
for (int i=0; i<tree.getRowCount(); i++)
tree.expandRow(i);
If I do this, it own expands the first 6 children (including the subtrees of each children)
2) /** Expand the tree */
for (int i=0; i<6; i++)
tree.expandRow(i);
any ideas?? please help!!I think u mistook my point. Let's say a JTree has 3 children as follows:
and each child has its own tree hierarchy.
root
|_SUBTREE1
|_SUBTREE2
|_SUBTREE3
All I want is when the user click a particular tree node, the whole subtree will expand.
I tried the following, but it only expands the child of the tree node I selected.
public void treeExpanded(TreeExpansionEvent evt)
{ System.out.println("treeExpanded...");
TreePath path = evt.getPath();
int pathCount = path.getPathCount();
System.out.println(pathCount);
for (int i=0; i<pathCount; i++)
tree.expandPath(path);
Any ideas??? -
Hi,
I have a little problem with expanding JTree. I have created UI with levelbuttons, which sould expand jTree to next sublevel and collapse jTree back to higher level. The first time I press the expanding button all works fine, because I can set all the rows I want to expand, in this case all rows with addSelectionInterval method ( addSelectionInterval(0, jTree.getRowCount()) ). The problem is, how do I know the rows of next sublevel to expand. Collapsing the current sublevel rows is also a problem. How can get the row indexes of current level?Can you put your code here?
The following may be a solution:
TreePath treepath =tree.getPathForRow(int row) ; // row is the one you know;
DefaultMutableTreeNode node=(DefaultMutableTreeNode)(treepath.getLastPathComponent());
DefaultMutableTreeNode childnode = node.getFirstChild();
tree.expandPath(new TreePath(childnode.getPath())); -
Hi, ALL
I have created a JTree, ---Root
|--One
|--Two
It display perfect. however, when I added some sub node under
|-One
it did, however, it is not expanded. I want to expanded subnode after
It is added automatically, Do not need user to push mouse or do some action. how to implement it?
Thanks in advancedthere's a method named expandPath(...) in JTree?!
-
Making a JTree expanded by default
I made a JTree and was wondering if there is a way to make it so that the JTree is totally expanded by default instead of having to click the circles to expand each spot.
// If expand is true, expands all nodes in the tree.
// Otherwise, collapses all nodes in the tree.
public void expandAll(JTree tree, boolean expand) {
TreeNode root = (TreeNode)tree.getModel().getRoot();
// Traverse tree from root
expandAll(tree, new TreePath(root), expand);
private void expandAll(JTree tree, TreePath parent, boolean expand) {
// Traverse children
TreeNode node = (TreeNode)parent.getLastPathComponent();
if (node.getChildCount() >= 0) {
for (Enumeration e=node.children(); e.hasMoreElements(); ) {
TreeNode n = (TreeNode)e.nextElement();
TreePath path = parent.pathByAddingChild(n);
expandAll(tree, path, expand);
// Expansion or collapse must be done bottom-up
if (expand) {
tree.expandPath(parent);
} else {
tree.collapsePath(parent);
} -
Changing JTree Expand And collapsed Icons
Hi,
can anyone tell me how to change the expanded and collpased icons on a JTree, i am using windows look and feel, and i don't know how to change the '+' and '-' icons, the other icons are changed using the DefaulTreeCellRenderer, but i haven't found a way to achieve my goal....
thanksIn the beginning of your main method you write :
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
UIManager.put("Tree.collapsedIcon",new ImageIcon("plus.gif");
UIManager.put("Tree.expandedIcon",new ImageIcon("minus.gif");
catch (Exception exc) {
System.err.println("Error loading L&F: " + exc);
}And you change the name of the images with the wanted ones.
Denis -
Jtree - expand leafs to the LEFT
hello !
how can I change the direction on the JTree -
currenlty the tree is expanding left to right .
I would like to expand it right to left , so it will fix languages like arabic.
(it will looks like mirror view of the current tree)
thanks.JTree.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
-
how to check if a node in a JTree is expanded???
In my JTree there are couple of nodes which are all initially expanded.
User collapses couple of nodes in the JTree while others are still expanded.
Then, if user deleted a node from a JTree would like to keep all expanded nodes as expanded and collapsed nodes as collapsed.
How to do this?
Thanks. -
How can I change the icon in the JTree of JavaHelps TOC when I expand or close the node. I understand that I need to give the tree a different cell renderer but can't find out where to do that. Does anyone have an example of this?
Thanks,
Rich
DeveloperThankyou for your help. I am getting a lot closer. There is something I am still missing though. I am sure I am setting the cell renderer to the tree now. The problem is that it is not effecting the images at all. Here is my code for this. Can you see what I am doing wrong?
private void jButtonHelp_ActionPerformed()
try
ClassLoader loader = this.getClass().getClassLoader();
URL helpURL = HelpSet.findHelpSet(loader, "helpset.hs");
m_hs = new HelpSet(loader, helpURL);
HelpBroker hb = m_hs.createHelpBroker();
JHelp jhelp = new JHelp(m_hs);
JHelpTOCNavigator jhtoc = null;
hb.setDisplayed(true);
new CSH.DisplayHelpFromSource(hb);
for(Enumeration enum = jhelp.getHelpNavigators();enum.hasMoreElements();)
try
jhtoc = (JHelpTOCNavigator)enum.nextElement();
break;
catch(Exception ee){}
if(jhtoc != null)
JTree aTree = getNavTree(jhtoc);
aTree.setCellRenderer(new HelpTreeRenderer());
aTree.updateUI();
jhelp.updateUI();
catch (Exception e)
System.out.println("Help Exception " + e.getMessage());
class HelpTreeRenderer extends DefaultTreeCellRenderer{
public Component getTreeCellRendererComponent(JTree tree, Object value,
boolean selected, boolean expanded, boolean leaf, int row,
boolean hasFocus) {
try
DefaultTreeCellRenderer treeCellRender = (DefaultTreeCellRenderer)
super.getTreeCellRendererComponent(tree, value, selected, expanded,
leaf, row, hasFocus);
DefaultMutableTreeNode node =(DefaultMutableTreeNode)value;
if(node.getLevel() == 1) treeCellRender.setIcon(getImageDepartment());
catch (Exception e)
System.out.println("HelpTreeRenderer Inner Class WIP Viewer Exception " + e.getMessage());
return this;
}
Maybe you are looking for
-
How can I copy pictures from my iPad to my windows laptop
HHow can I copy pictures from my iPad to my windows laptop
-
How i can to know in process, what button was pressed on the Form
-
Trying to update Mackie Control Universal - Help?!
Hi all, I just got hold of a Mackie Control Universal, but for the life of me can't work out how to update it! I've been having a few issues,not sure how they come about, but during working with the MCU, the settings will all automatically change so
-
Process industry_PI characteristics
Dear friends, I am creating mater recipe in t.code C201. While creating, i have given control recipe destination as "01" (Standard), process instruction category as "AORD_1 (Order data--standard). Under AORD_1, i have called the following characte
-
Microsoft Office 2011 Installed on Macbook, But Won't Open
Hi all. I'm running Mac OS X (10.7.5) on a white Macbook. I had a problem with my old Word software (it would crash if I tried to use bullet points or open a saved doc), so I completely uninstalled Microsoft Office including all the Microsoft files i