Root Handles (icons next to the node) not visible in TreeTable
Hi i am using the example provided at www.java.sun.com for TreeTable. I have a tree table and when i add new nodes the data is visible in the table but the handles are not visible. I don't know how to resolve this problem. Below is my code where i'm adding new data.
private void addNewNode(MyNode _root) {
NodeInfo info = new NodeInfo();
info.order= "Pending";
info.qty = "200";
info.price = "20,000";
MyNode node = new MyNode(info);
_root.add(node);
tree.expandPath(new TreePath(_root.getPath()));
Sorry my mistake...i was not returning TreeTableModel.class in getColumnClass() of my custom treetable model class.
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Unable to drag the Icon associated with the node
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I have to drag the Icon associated with the leaf too. I am able to drag only the string of the node not the Icon that is associated with it. Can you help me with this? I have the code as below. Thanks.
public class IconNode extends DefaultMutableTreeNode {
protected Icon icon;
protected String iconName;
//* IconNode
/**Creates an IconNode Object*/
public IconNode() {
this(null);
}//end IconNode
//* IconNode
/**Creates an IconNode Object*/
public IconNode(Object userObject) {
this(userObject, true, null);
}// end IconNode
//* IconNode
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public IconNode(Object userObject, boolean allowsChildren
, Icon icon) {
super(userObject, allowsChildren);
this.icon = icon;
}//end IconNode
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public void setIcon(Icon icon) {
this.icon = icon;
}// end setIcon
//* getIcon
/**gets the Icon of the node*/
public Icon getIcon() {
return icon;
}//end getIcon
//* getIconName
/**gets the IconName*/
public String getIconName() {
if (iconName != null) {
return iconName;
} else {
String str = userObject.toString();
int index = str.lastIndexOf(".");
if (index != -1) {
return str.substring(++index);
} else {
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}//end getIconName
//* setIconName
/**sets the IconName*/
public void setIconName(String name) {
iconName = name;
}//end setIconName
}// end IconNodepublic class IconNode extends DefaultMutableTreeNode {
protected Icon icon;
protected String iconName;
//* IconNode
/**Creates an IconNode Object*/
public IconNode() {
this(null);
}//end IconNode
public class DNDTree extends JTree
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super (top);
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setAutoscrolls(true);
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public DNDTreeHandler(Component dndComponent)
super(dndComponent);
public DataFlavor[] getSupportedDataFlavors()
return transDataItem.getTransferDataFlavors();
* Gets the data from the selected object being dragged
* @return node DataItem being dragged
public Transferable getTransferable()
TreePath path = getSelectionPath();
//DefaultMutableTreeNode selection = (DefaultMutableTreeNode)path.getLastPathComponent();
IconNode selection = (IconNode)path.getLastPathComponent();
if (path == null)
return(null);
else
TransferableDataItem node = new TransferableDataItem(selection);
return(node);
* Handles the drop of the component after the drag is complete
* @param transferable Object being dropped
* @param event drop event information
public void handleDrop(Transferable transferable, DropTargetDropEvent event) throws Exception
Point location = event.getLocation();
//Get path of node where object being dropped
TreePath path = getClosestPathForLocation(location.x, location.y);
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if(path == null)
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public abstract class DnDHandler implements DropTargetListener,DragSourceListener, DragGestureListener
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protected DragSource dragSource;
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dragSource = new DragSource();
dragSource.createDefaultDragGestureRecognizer( dndComponent, DnDConstants.ACTION_COPY_OR_MOVE, this);
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protected abstract Transferable getTransferable();
protected abstract void handleDrop(Transferable transferable, DropTargetDropEvent event) throws Exception;
protected abstract DataFlavor[] getSupportedDataFlavors();
public void dropFailed (DragSourceDropEvent event)
System.out.println("Drop Failed");
public void dropSuccess (DragSourceDropEvent event)
System.out.println("Drop was successful");
private boolean isTransferableSupported(Transferable t)
DataFlavor[] flavors = getSupportedDataFlavors();
for (int i=0; i<flavors.length; i++)
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return true;
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Transferable trans = getTransferable();
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dragSource.startDrag (event, dragIcon, trans, this);
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public void drop (DropTargetDropEvent event)
try
Transferable transferable = event.getTransferable();
// we accept only Strings
if (isTransferableSupported (transferable))
event.acceptDrop(event.getDropAction());
handleDrop(transferable, event);
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else
event.rejectDrop();
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public void dragDropEnd (DragSourceDropEvent event) {
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final static int STRING = 1;
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return flavors;
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return transDataItem.getTransferDataFlavors();
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System.out.println("Selected Value is " + selectedItem);
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return(item);
* Handles the drop of the component after the drag is complete
* @param transferable Object being dropped
* @param event drop event information
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Transferable tr = event.getTransferable();
Point location = event.getLocation();
if (tr.isDataFlavorSupported(TransferableDataItem.DEFAULT_MUTABLE_DATAITEM_FLAVOR))
//event.acceptDrop (DnDConstants.ACTION_COPY_OR_MOVE);
// Object userObject = tr.getTransferData(TransferableDataItem.DEFAULT_MUTABLE_DATAITEM_FLAVOR);
IconNode userObject = (IconNode)tr.getTransferData(TransferableDataItem.DEFAULT_MUTABLE_DATAITEM_FLAVOR);
addElement(location, userObject);
//dropTargetDropEvent.getDropTargetContext().dropComplete(true);
else
System.err.println ("Rejected");
event.rejectDrop();I think your problem come from this method :
if (tr.isDataFlavorSupported(TransferableDataItem.DEFAULT_MUTABLE_DATAITEM_FLAVOR))
System.out.println("Got transfered data");
Object userObject = tr.getTransferData(TransferableDataItem.DEFAULT_MUTABLE_DATAITEM_FLAVOR);
//DefaultMutableTreeNode node = (DefaultMutableTreeNode)path.getLastPathComponent();
IconNode node = (IconNode)path.getLastPathComponent();
IconNode newNode = new IconNode(userObject);
DefaultTreeModel model = (DefaultTreeModel)getModel();
model.insertNodeInto(newNode, node, 0);
...You should write :
if (tr.isDataFlavorSupported(TransferableDataItem.DEFAULT_MUTABLE_DATAITEM_FLAVOR))
IconNode node = (IconNode)tr.getTransferData(TransferableDataItem.DEFAULT_MUTABLE_DATAITEM_FLAVOR);
IconNode node = (IconNode)path.getLastPathComponent();
IconNode newNode = new IconNode(node);
DefaultTreeModel model = (DefaultTreeModel)getModel();
model.insertNodeInto(newNode, node, 0);
...and create a construcor for IconNode :
public IconNode(IconNode node) {
super(node.getUserObject, node.getAllowsChildren());
icon = node.icon;
}When you use IconNode newNode = new IconNode(userObject), the icon is null (see your constructor).
If I can say something, you should simplify your code : you can do the same thing dividing the size of your code by five (at less).
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