DnD, JTree and inter-node placement

Hi, there.
Drag'n'Drop with JTrees has been discussed at length in this list. I have a DnD-capable application, and the user sees the nodes affected by the drag position as selected, so he knows where the drop will perform.
Now I want to drop not only on other nodes, but also inbetween. You may imagine there is a red bar shown as soon as the drag is between tree nodes, and the result will be a new node inserted at exactly this position.
Any ideas how to implement that?
Hiran

Still on the problem. Have some thoughts. But absolutely no idea whether this may work at all:
Upon dragover, the cell affected is selected. That means I query getClosestPathForLocation() and then call setSelectionPath with the result. This works for nodes.
Now I need to detect the inter-node placement. So the row must get calculated by myself, and if necessary, an extra node will be inserted into the tree. This extra node is rendered just as slim red line, so the user knows now he drops between nodes. Whatever happens now (drop performed, mouse moved elsewhere), the red line will be removed first.
What do you think?

Similar Messages

JTree and selected node question

Hello
Is it possible to convert the selected node to an int?
I guess I'm looking for something llike this.
int nodeNumber = node.getSelectedIndex();
There is nothing like that in the API, and it would help greatly if I could find a way do this.
Thanks
Have a good holiday
Jim

From the API for JTree
public int getMinSelectionRow()
Gets the first selected row.
Returns:
an integer designating the first selected row, where 0 is the first row in the display
But I think this is based on how many rows are displayed at the present time and might change if the tree is opened above it.

JTree and Unique node values

Hi,
I am dynamically generating a JTree based on (non-unique) category descriptions found in a database. My trouble is that each node must also be identified by a (hidden) unique node id number.
I have played around with myNode.setUserObject("uniqueNodeNumber");
but that appears to change the title of the node itself.
Any ideas or suggestions would be greatly appreciated.
Thank you!

class UserObject {
    private int id;
    private Object object;
    public UserObject (int id, Object object) {
        this.id = id;
        this.object = object;
    public int getID () {
        return id;
    public Object getObject () {
        return object;
    public String toString () {
        return object.toString ();
}You can add this object to your tree.
Kind regards,
  Levi

JTree cut and paste multiple child and ancestor nodes not function correct

Hello i'm creating a filebrowser for multimedia files (SDK 1.22) such as .jpg .gif .au .wav. (using Swing, JTree, DefaultMutableTreeNode)
The problem is I want to cut and paste single and multiple nodes (from current node til the last child "top-down") which partly functions:
single nodes and multiple nodes with only one folder per hierarchy level;
Not function:
- multiple folders in the same level -> the former order gets lost
- if there is a file (MMed. document) between folders (or after them) in the same level this file is put inside one of those
I tried much easier functions to cope with this problem but every time I solve one the "steps" the next problem appears...
The thing I don't want to do, is something like a LinkedList, Hashtable (to store the nodes)... because the MMed. filebrowser would need to much resources while browsing through a media library with (e.g.) thousands of files!
If someone has any idea to solve this problem I would be very pleased!
Thank you anyway by reading this ;)
// part of the code, if you want more detailed info
// @mail: [email protected]
import java.util.Enumeration;
import javax.swing.*;
import javax.swing.tree.*;
// var declaration
static Enumeration en;
static DefaultMutableTreeNode jTreeModel, lastCopiedNode, dmt, insert, insertParent, insertSameFolder;
static String varCut;
static int index= 0;
static int counter = 0;
/* cut function */
if (actionCommand.equals ("cut"))
     // get the selected node (DefaultMutableTreeNode)
     lastCopiedNode = (DefaultMutableTreeNode) selPath.getLastPathComponent ();
     // get the nodes in an Enumeration array (in top- down order)
     en = dmt.preorderEnumeration();
     // the way to make sure if it is a cut or a copied node
     varCut = "cut";
/* paste function */
if (actionCommand.equals ("paste"))
// node is cut
if (varCut == "cut")
// is necessary for first time same folder case
insertParent = dmt;
// getting the nodes out of the array
while(en.hasMoreElements())
     // cast the Object to DefaultMutableTreeNode
     // and get stored (next) node
     insert = (DefaultMutableTreeNode) en.nextElement();
// check if the node is a catalogue when getRepresentation()
// is a function of my node creating class (to know if it is
// a folder or a file)
if (insert.getRepresentation().equals("catalogue"))
     // check if a "folder" node is inserted
     if (index == 1)
          counter = 0;
          index = 0;
     System.out.println ("***index and counter reset***");
     // the node is in the same folder
     // check if the folder is in the same hierarchy level
     // -> in this case the insertParent has to remain
     if (insert.getLevel() == insertParent.getLevel())
          // this is necessary to get right parent folder
          insertSameFolder = (Knoten) insert.getParent();
          jTreeModel.insertNodeInto (insert, insertSameFolder, index);
System.out.println (">>>sameFolderCASE- insert"+counter+"> " + String.valueOf(insert) +
          "\ninsertTest -> " + String.valueOf(insertTest)
          // set insertParent folder to the new createded one
          insertParent = insert;
          index ++;
     else // the node is a subfolder
          // insertNode
          jTreeModel.insertNodeInto (insert, insertParent, index);
          // set insertParent folder to the new createded one
          insertParent = insert;
System.out.println (">>>subFolderCASE- insertParent"+counter+"> " + String.valueOf(insertParent) +
          "\ninsertParent -> " + String.valueOf(insertParent)
          index ++;
else // the node is a file
     // insertNode
     jTreeModel.insertNodeInto (insert, insertParent, counter);
     System.out.println (">>>fileCASE insert "+counter+"> " + String.valueOf(insert) +
     "\ninsertParent -> " + String.valueOf(insertParent)
counter ++;
// reset index and counter for the next loop
index = 0;
counter = 0;
// reset cut var
varCut = null;
// remove the node (automatically deletes subfolders and files)
dmt.removeNodeFromParent (lastCopiedNode);
// if node is a copied one
if varCut == null)
     // insert copied node the same way as for cut one's
     // to make it possible to copy more than one node
}

You need to use a recursive copy method to do this. Here's a simple example of the copy. To do a cut you need to do a copy and then delete the source.
import java.io.*;
import javax.swing.*;
import javax.swing.tree.*;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.*;
import java.util.*;
public class CopyTree extends JFrame
     Container cp;
     JTree cTree;
     JScrollPane spTree;
     DefaultTreeModel cModel;
     CNode cRoot;
     JMenuBar menuBar = new JMenuBar();
     JMenu editMenu = new JMenu("Edit");
     JMenuItem copyItem = new JMenuItem("Copy");
     JMenuItem pasteItem = new JMenuItem("Paste");
     TreePath [] sourcePaths;
     TreePath [] destPaths;
     // =====================================================================
     // constructors and public methods
     CopyTree()
          super("Copy Tree Example");
          addWindowListener(new WindowAdapter()
          {public void windowClosing(WindowEvent evt){System.exit(0);}});
          // edit menu
          copyItem.addActionListener(new ActionListener()
          {public void actionPerformed(ActionEvent e){mnuCopy();}});
          editMenu.add(copyItem);
          pasteItem.addActionListener(new ActionListener()
          {public void actionPerformed(ActionEvent e){mnuPaste();}});
          editMenu.add(pasteItem);
          menuBar.add(editMenu);
          setJMenuBar(menuBar);
          buildModel();
          cp = getContentPane();
          cTree = new JTree(cModel);
          spTree = new JScrollPane(cTree);
          cp.add(spTree, BorderLayout.CENTER);
          pack();
     static public void main(String [] args)
          new CopyTree().show();
     // =====================================================================
     // private methods - User Interface
     private void mnuCopy()
          sourcePaths = cTree.getSelectionPaths();
     private void mnuPaste()
          TreePath sp, dp;
          CNode sn,dn;
          int i;
          destPaths = cTree.getSelectionPaths();
          if(1 == destPaths.length)
               dp = destPaths[0];
               for(i=0; i< sourcePaths.length;i++)
                    sp = sourcePaths;
                    if(sp.isDescendant(dp) || dp.isDescendant(sp))
                         JOptionPane.showMessageDialog
                              (null, "source and destinations overlap","Paste", JOptionPane.ERROR_MESSAGE);
                         return;
               dn = (CNode)dp.getLastPathComponent(); // the node we will append our source to
               for(i=0; i< sourcePaths.length;i++)
                    sn = (CNode)sourcePaths[i].getLastPathComponent();
                    copyNode(sn,dn);
          else
               JOptionPane.showMessageDialog
                    (null, "multiple destinations not allowed","Paste", JOptionPane.ERROR_MESSAGE);
     // recursive copy method
     private void copyNode(CNode sn, CNode dn)
          int i;
          CNode scn = new CNode(sn);      // make a copy of the node
          // insert it into the model
          cModel.insertNodeInto(scn,dn,dn.getChildCount());
          // copy its children
          for(i = 0; i<sn.getChildCount();i++)
               copyNode((CNode)sn.getChildAt(i),scn);
     // ===================================================================
     // private methods - just a sample tree
     private void buildModel()
          int k = 0;
          cRoot = new CNode("root");
          cModel = new DefaultTreeModel(cRoot);
          CNode n1a = new CNode("n1a");
          cModel.insertNodeInto(n1a,cRoot,k++);
          CNode n1b = new CNode("n1b");
          cModel.insertNodeInto(n1b,cRoot,k++);
          CNode n1c = new CNode("n1c");
          cModel.insertNodeInto(n1c,cRoot,k++);
          CNode n1d = new CNode("n1d");
          cModel.insertNodeInto(n1d,cRoot,k++);
          k = 0;
          CNode n1a1 = new CNode("n1a1");
          cModel.insertNodeInto(n1a1,n1a,k++);
          CNode n1a2 = new CNode("n1a2");
          cModel.insertNodeInto(n1a2,n1a,k++);
          CNode n1a3 = new CNode("n1a3");
          cModel.insertNodeInto(n1a3,n1a,k++);
          CNode n1a4 = new CNode("n1a4");
          cModel.insertNodeInto(n1a4,n1a,k++);
          k = 0;
          CNode n1c1 = new CNode("n1c1");
          cModel.insertNodeInto(n1c1,n1c,k++);
          CNode n1c2 = new CNode("n1c2");
          cModel.insertNodeInto(n1c2,n1c,k++);
     // simple tree node with copy constructor
     class CNode extends DefaultMutableTreeNode
          private String name = "";
          // default constructor
          CNode(){this("");}
          // new constructor
          CNode(String n){super(n);}
          // copy constructor
          CNode(CNode c)
               super(c.getName());
          public String getName(){return (String)getUserObject();}
          public String toString(){return getName();}

How to retrieve the nodes from the Database on JTree and many more

I am facing a problem with JTree. I want to retrieve all the nodes from the MS-Access database on the Frame(i.e. Frame will display the JTree), then I also want to perform function like Edit, insert , delete and Drag and Drop opeartion on the JTree and the database should also updated accordingly.
So, if you have any idea or if you have some code to look for then please send it to me.

I am facing a problem with JTree. I want to retrieve all the nodes from the MS-Access database on the Frame(i.e. Frame will display the JTree), then I also want to perform function like Edit, insert , delete and Drag and Drop opeartion on the JTree and the database should also updated accordingly
pls give me code

Default JTree with the colors, sports and food nodes

Hi!
Is there a way to create a JTree with a null root node and no elements without Swing adding the colors, sports and food nodes automatically ?
thanks

Create a new DefaultMutableTreeNode and set it as the root.

Meeting place 8.0 and WebEx Node Integration issue.

Hello All,
We have installed MP 8.x and Webex node on seperate servers. After this we have installed a webserver.exe and sql server on a different server and configured the GatewaySIM and sql. connectivity is fine.
1. Please let us know how to login to MP user portal. (What is the URL)
2. How to integrate Webex with MP?
3. Is there a good document to bring up the webex web interface.
Regards,
Shaijal

Take a look at http://docwiki.cisco.com/wiki/Cisco_Unified_MeetingPlace_Release_8.0_--_Integrating_Cisco_Unified_MeetingPlace_with_Cisco_WebEx
That has all the information I used to eventually get the MP WebEx integration to work for us.
If you have problems you may struggle to get a good answer from Cisco on this, unfortunately there is very little knowledge of WebEx within Cisco TAC, something they badly need to address.

Drag and Drop between JTree and another component

Hi,
I have searched the forum for answer to this question but am not sure I found something similar to this. So, please help me out on this.
I have a JTree and a JPanel, which basically shows images (as thumbnails) for the child nodes of one node in the tree heirarchy.
I need to be able to drag and drop components from the JPanel to the JTree and vice versa, and of course, when you drop them on the tree, they should go under the correct node.
I am using Swing 1.4.1, and have successfully implemented DnD in the JTree itself. But I am a little unclear about the DnD between the tree and the panel.
Would really appreciate if someone could throw some light on this.
Thanks a lot,
Sri.

Hi clairesheridan,
thanks for your response. Your answer would have helped me if I was using JDK 1.3 but I am try to use the Swing API in jdk1.4.1, in which you have to set a transferhandler etc.
Please let me know if you have any ideas or solutions.
Thanks,
sriharmya.

Drag and Drop between JTree and Labels in 2 different panes

Hi,
I am using JDK 1.4.1 and am trying to implement Drag n Drop between a JTree and JLabels with ImageIcons, both on different panes.
I got the DnD working fine on the tree. but i cant get to drag and drop the label from the other pane, on the Jtree as a node. I am getting confused with the DataFlavors, and also wonder if there is something else that i have to do for DnD between 2 panes. Can someone give me any leads on this, please? The Panes I am talking about are splitpanes.
thanks,
Sri.

hey thanks Dennis!! I was hoping you would respond to my question, as I have seen a lot of your replies. yes, the example you gave would be helpful. but i am trying to implement this in 1.4.1, with the new drag and drop in swing. and i am getting confused wiht theh data flavors etc.
my problem at hand is :
I have a tree on the left pane. i can drag and drop the nodes on the tree itself. (i already did that...no problem). I have Jlabels with imageicons (actually wrapper classes with labels and imageicons) on the right pane. i have to be able to drag these labels to the tree such that they form a node.
I have one class the NodeSelection class which extends TransferHandler and implements Transferable. i was able to do DnD for the tree using this. I customized the importData method in this.I thought that i can just use the same class to create the transferhandler and transferable, and just use a different implementation for the importData method if the data being dragged is from the label.
well, my thoughts and ideas were ok...but i can implement it...so they must be wrong ;-)
Can u please suggest another way to do this. I have a deadline to meet and am stuck here :-( any suggestions or tips or hints would be very helpful and appreciated!!
Thanks,
Sri.

JTree dynamic add nodes

Although i checked the forums related with the adding nodes dynamically i couldnt manadeg to work this code in the right way: http://papernapkin.org/pastebin/view/8761
It should show the nodes under a chosen path with the files correctly but it only shows the files and dirs under root. What is missing?
Second i want to change the size of JTree and pathArea but when i use pathArea.setSize, id doesnt show any effect on the screen? What should i do.
DirectoryOps.java is here: http://papernapkin.org/pastebin/view/8763

Never mind - found the answer to both of my problems. For anyone else who's wondering, I had to create a Runnable object which repaints my JTree. After adding or changing any nodes, I call SwingUtilities.invokeLater() on it and my tree repaints perfectly.
As far as I can tell, this wasn't required in the dynamic tree tutorial because the adding and editing of nodes in the tutorial happened in the button's event handling methods (so everything's taking place in the event-handling thread already).

Focus Problem with JTree and Menus

Hi all,
I have a problem with focus when editing a JTree and selecting a menu. The problem occurs when the user single clicks on a node, invoking the countdown to edit. If the user quickly clicks on a menu item, the focus will go to the menu item, but then when the countdown finishes, the node now has keyboard focus.
Below is code to reproduce the problem. Click on the node, hover for a little bit, then quickly click on the menu item.
How would I go about fixing the problem? Thanks!
import java.awt.Container;
import java.awt.GridLayout;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
public class MyTree extends JTree {
     public MyTree(DefaultTreeModel treemodel) {
          setModel(treemodel);
          setRootVisible(true);
     public static void main(String[] args) {
          JFrame frame = new JFrame();
          JMenuBar bar = new JMenuBar();
          JMenu menu = new JMenu("Test");
          JMenuItem item = new JMenuItem("Item");
          menu.add(item);
          bar.add(menu);
          frame.setJMenuBar(bar);
          Container contentPane = frame.getContentPane();
          contentPane.setLayout(new GridLayout(1, 2));
          DefaultMutableTreeNode root1 = new DefaultMutableTreeNode("Root");
          root1.add(new DefaultMutableTreeNode("Root2"));
          DefaultTreeModel model = new DefaultTreeModel(root1);
          MyTree tree1 = new MyTree(model);
          tree1.setEditable(true);
          tree1.setCellEditor(
               new ComponentTreeCellEditor(
                    tree1,
                    new ComponentTreeCellRenderer()));
          tree1.setRowHeight(0);
          contentPane.add(tree1);
          frame.pack();
          frame.show();
import java.awt.FlowLayout;
import java.util.EventObject;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.JTree;
import javax.swing.tree.DefaultTreeCellEditor;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeCellEditor;
import javax.swing.tree.TreeCellRenderer;
public class ComponentTreeCellEditor
     extends DefaultTreeCellEditor
     implements TreeCellEditor {
     private String m_oldValue;
     private TreeCellRenderer m_renderer = null;
     private DefaultTreeModel m_model = null;
     private JPanel m_display = null;
     private JTextField m_field = null;
     private JTree m_tree = null;
     public ComponentTreeCellEditor(
          JTree tree,
          DefaultTreeCellRenderer renderer) {
          super(tree, renderer);
          m_renderer = renderer;
          m_model = (DefaultTreeModel) tree.getModel();
          m_tree = tree;
          m_display = new JPanel(new FlowLayout(FlowLayout.LEFT));
          m_field = new JTextField();
          m_display.add(new JLabel("My Label "));
          m_display.add(m_field);
     public java.awt.Component getTreeCellEditorComponent(
          JTree tree,
          Object value,
          boolean isSelected,
          boolean expanded,
          boolean leaf,
          int row) {
          m_field.setText(value.toString());
          return m_display;
     public Object getCellEditorValue() {
          return m_field.getText();
      * The edited cell should always be selected.
      * @param anEvent the event that fired this function.
      * @return true, always.
     public boolean shouldSelectCell(EventObject anEvent) {
          return true;
      * Only edit immediately if the event is null.
      * @param event the event being studied
      * @return true if event is null, false otherwise.
     protected boolean canEditImmediately(EventObject event) {
          return (event == null);
}

You can provide a cell renderer to the JTree to paint the checkBox.
The following code checks or unchecks the box with each click also:
_tree.setCellRenderer(new DefaultTreeCellRenderer()
private JCheckBox checkBox = null;
public Component getTreeCellRendererComponent(JTree tree,
                                                Object value,
                                                boolean selected,
                                                boolean expanded,
                                                boolean leaf,
                                                int row,
                                                boolean hasFocus)
    // Each node will be drawn as a check box
    if (checkBox == null)
      checkBox = new JCheckBox();
      checkBox .setBackground(tree.getBackground());
    DefaultMutableTreeNode node = (DefaultMutableTreeNode)value;
    checkBox.setText(node.getUserObject().toString());
    checkBox.setSelected(selected);
    return checkBox;
});

Model and Value node data in one form...?

Hello,
I have a requirement where the adobe form is expected to have model data available and then in the same form teh user provides data, which is maintained in value node.
Now the problem we are facing is, we are unable to maintain both value node and model node(i.e,attributes) under one type of node.(Invalid node type error appears when tried to place both attributes under one node).
How do we provide them to data source, as it takes only one node.
Thanks & Regards,
Sharath

Hi,
you could try to add a some calculated attributes in the node which is bound to the interactive form. In the getter and setter methods of these calculated attributes you can read and set the value of your model attributes.
Regards
Sebastian

Suggestion on Intra and inter company process

Hi
I have a requirement where we are configuring both intra and inter company billing thorugh one sales doucment type.
Intra :Process:
ORder ---> PR/PO ---> MIGO--> MIRO ---> Delivery. ( Between same company codes)
Inter Process
Order ---> PR/PO ---> Order ( supplying company) ---> PR/ PO ---> MIGO--> MIRO ---> DELIVERY---> IV BILLING.
Now the question is we have same item categories and schedule lines, but for intra there is no billing , inter process IV billing will be created.
can you suggest me with out changing the item categories how we can achieve the automatically.
thanks

Hi JC,
Well, the settings are basically the same for both flows on MM side. There are some settings that differ on SD side, but if you stick to standard delivery types, billing types and item categories, this should be already in place.
To start with SAP standard, you should complete all the steps in IMG under MM > Purchasing > Purchase order > Set up Stock Transport Order.
In the first option you allocate a customer number to the receiving plant (make sure you have the same number in your development system as in production - by e.g. external number range) and a shipping area (sales org. - DC - division) to the sending plant.
In the fourth option you allocate the combination of PO order type and the supplying plant to the delivery type and the avail. check. SAP std uses the order type UB and delivery type NL for intra-company trsp and order type NB and delivery type NLCC for cross-company trsp.
In the last fifth option you define the possible flows - the supplying plant, the receiving plant and the order type to be used (in std - UB for intra-company and NB for cross-company trsp).
The rest should be in place. Maybe only account determination missing.
Actually you can also run intra-company transports with order type UB and delivery type NL if you don't need the cross-company invoicing for legal purposes (e.g. creating invoices manually).
The process for UB orders is PO > SD delivery (trs VL10B) > goods issue for the delivery (trs VL02N), goods receipt for the outbound delivery (MIGO). You can also substitute the SD delivery with MM mvt type 351 (trs MIGO).
In case of cross-company trsp with NB order, two more steps are added; billing in SD (trs VF01 with ref. to the delivery) and invoice verification in MM.
Please tell the forum if any specific questions.
BR
Raf
Edited by: Rafael Zaragatzky on Apr 12, 2009 11:11 PM

Inter company selling and inter company stock transfer?

Hi Gurus,
what is the difference between Inter company selling and inter company stock transfer?

Hi,
Intercompany selling is the sale of goods in one company code to another company code.Here with the settings at OMGN purchasing plant creates PO with document type NB and system will allow to put conditions in the PO .Sometimes transfer price also may take place.Sale plant will deliver the goods at VL10B and PGIs the material at VL02N and bills the customer here the purchasing plant , and purchasing plant receives the material normally posts the sent bill by his vendor the sale plant at miro.
In the stock transfers, it is a normal stock transfer between the plants of a sdame company code , which does not involves with bilkling rather system will allow to put the conditions of frieght only in the PO.As said the the PO will be created with document type UB. if you want to involve the SD do the settimgs at OMGN for document type UB.AND the other prosedure will be same as above.
If not the stock transfer can also be done using mormal MIGO operations of moment types.After receiving the stock will be valuated at the receiving plant valuation.
Do remember that the material should exist in both the plants.
Regards,

How to drag and drop nodes in Tree?

Hi,
I want to drag and drop nodes in the tree. For example a tree represents the hierarchy of employees reporting in an organization by using tree.I want to change the reporting an employee visible in the tree by simple drag and drop operation in place of going to another form for updating each employee record indiviually.
Regards
Piyush

Ron,
I looked into implementing drag / drop in one of the apex trees I created today and ran across this thread. Thank you Ron for the links, it helped a lot.
I added the code below to my page's "Execute when Page Loads" (tree region id is "tree_reg") and the tree is now drag/drop enabled.
It did break the [+] icon from collapsing the tree though ... but the apex.widget.tree buttons still work
var regTree = apex.jQuery("#tree_reg").find("div.tree");
regTree.tree({
callback : {
onmove: function(NODE, TREE_OBJ, REF_NODE, TYPE)
{alert(NODE.id+" "+TREE_OBJ.id+" "+ REF_NODE);}
});Next, I plan on creating a AJAX call using NODE.id, TREE_OBJ.id, and REF_NODE
V/R
Ricker

DnD, JTree and inter-node placement

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