JPanel in JTree not opaque ...

Hello it's me again, the guy nobody answers :-)
Well anyway solved my JTree Problem, but now I display panels as nodes but I do not get the panel to be opaqe - the panel is grey and the applet is white. It doesn't look well ...
If somebody knows the solution I'd be glad.
Thanks.

O.K. I got it, well I guess my English !good.

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Hi all,
I am writing a code to play a video and then draw some lines on the video. For that first I am playing the video on a visual component and I am trying to overlap a JPanel for drawing the lines. I am able to overlap the JPanel but I am not able to make it transparent. So I am able to draw lines but not able to see the video. So, I want to make the JPanel transparent so that I can see the video also... I am posting my code below
import javax.media.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import java.lang.Math;
import javax.media.control.FramePositioningControl;
import javax.media.protocol.*;
import javax.swing.*;
class MPEGPlayer2 extends JFrame implements ActionListener,ControllerListener,ItemListener
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 String currentDirectory;
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 BufferedWriter out;
 FileWriter fos;
 String filename = "";
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 JButton bn = new JButton("DrawLine");
 MPEGPlayer2 (String title)
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 System.exit (0);
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 try
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Here are the two classes. Your help is greatly appreciated.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
import java.util.*;
public class CategoryMaintFrame extends AnyInternalFrame {
private JDesktopPane desktop;
private JFrame parentFrame;
// CENTER
private JScrollPane scroller;
private CategTree categTree;
private JTree cTree;
private DefaultTreeModel theModel;
// SOUTH
private JPanel buttonPanel;
private JButton addRootButton;
private JButton cancelButton;
private JButton okButton;
private ActionListener al;
// OTHER PROPERTIES
private Project theProject;
private AllCategories theCategs;
private DefaultMutableTreeNode theRoot;
private CategoryPopUp popUpMenu;
// CONSTRUCTOR
public CategoryMaintFrame(JDesktopPane pane, AllCategories categs, Project proj) {
super("Global and Project-Specific Categories");
desktop = pane;
parentFrame = (JFrame) pane.getParent().getParent().getParent();
theCategs = categs;
theProject = proj;
this.getContentPane().setLayout(new BorderLayout());
buildGUI();
setButtonListeners();
setSize(400,300);
addInternalFrameListener(new InternalFrameAdapter() {
public void InternalFrameClosing(WindowEvent we) {
CategoryMaintFrame.this.dispose();
desktop.add(this);
setVisible(true);
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// NORTH, EAST & WEST
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fillerW.setPreferredSize(new Dimension(20,20));
this.getContentPane().add(fillerW, BorderLayout.WEST);
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fillerE.setPreferredSize(new Dimension(20,20));
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JLabel fillerN = new JLabel("");
fillerN.setPreferredSize(new Dimension(20, 20));
getContentPane().add(fillerN, BorderLayout.NORTH);
// CENTER: TREE
// the Root is a non-data-based node created to root all of
// the category trees
theRoot = new DefaultMutableTreeNode("theRoot");
categTree = new CategTree(theCategs, theProject);
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cTree.setRootVisible(true);
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scroller = new JScrollPane(categTree.getTree());
this.getContentPane().add(scroller, BorderLayout.CENTER);
// SOUTH: BUTTONS
buttonPanel = new JPanel();
addRootButton = new JButton("Add Root");
buttonPanel.add(addRootButton);
okButton = new JButton("Done");
buttonPanel.add(okButton);
getContentPane().add(buttonPanel, BorderLayout.SOUTH);
private void setButtonListeners() {
al = new ActionListener() {
public void actionPerformed(ActionEvent ae) {
if (ae.getActionCommand() == "Add Root") {
Category newCateg = new Category();
newCateg.setTitle("<un-named>");
newCateg.setProjectID(new Integer(0));
newCateg.setProject(new Project(0));
newCateg.setIsRoot(true);
theCategs.addCategory(newCateg);
DefaultMutableTreeNode newRoot = new DefaultMutableTreeNode(newCateg);
((DefaultTreeModel) cTree.getModel()).insertNodeInto(newRoot,
theRoot, theRoot.getChildCount());
theModel.reload(newRoot);
} else if (ae.getActionCommand() == "Done") {
CategoryMaintFrame.this.dispose();
addRootButton.addActionListener(al);
okButton.addActionListener(al);
popUpMenu = new CategoryPopUp(theCategs, parentFrame, theProject);
cTree.addMouseListener(popUpMenu);
((DefaultTreeModel) cTree.getModel()).addTreeModelListener(new MyTreeModelListener());
class MyTreeModelListener implements TreeModelListener {
public void treeNodesChanged(TreeModelEvent e) {
System.out.println("model change detected");
DefaultMutableTreeNode node;
node = (DefaultMutableTreeNode)
(e.getTreePath().getLastPathComponent());
* If the event lists children, then the changed
* node is the child of the node we've already
* gotten. Otherwise, the changed node and the
* specified node are the same.
try {
int index = e.getChildIndices()[0];
node = (DefaultMutableTreeNode)
(node.getChildAt(index));
} catch (NullPointerException exc) {}
Category chgdCateg = (Category) node.getUserObject();
theCategs.changeCategory(chgdCateg);
public void treeNodesInserted(TreeModelEvent e) {
System.out.println("model insert detected");
DefaultMutableTreeNode node;
node = (DefaultMutableTreeNode) e.getTreePath().getLastPathComponent();
if (!node.isRoot()) { // the root of the tree isn't a category; if
// we added a node without a parent (a root category),
// don't create a category relationship
Category parCateg = (Category) node.getUserObject();
try {
int index = e.getChildIndices()[0];
node = (DefaultMutableTreeNode) node.getChildAt(index);
Category addCateg = (Category) node.getUserObject();
theCategs.addCategory(addCateg);
theCategs.addCategoryRelation(parCateg, addCateg);
} catch (NullPointerException exc) {}
public void treeNodesRemoved(TreeModelEvent e) {
System.out.println("model remove detected");
DefaultMutableTreeNode anode, bnode;
anode = (DefaultMutableTreeNode) e.getTreePath().getLastPathComponent();
// get all of the children (not just immediate children) of the parent and
// delete them
Category delCateg;
Vector allChildren = new Vector();
Object[] nodeChildren = e.getChildren();
// load the immediate children into a vector
for (int i = 0; i < nodeChildren.length; i++) {
anode = (DefaultMutableTreeNode) nodeChildren;
allChildren.addElement(anode);
boolean moreChildren = true;
int i = 0;
// iterate thru the vector, deleting the Categories, and adding their
// children (if any) the end of the vector so they are likewise deleted
while (moreChildren) {
anode = (DefaultMutableTreeNode) allChildren.elementAt(i);
delCateg = (Category) anode.getUserObject();
// get this node's children, and store then in the vector
Enumeration en = anode.children();
while(en.hasMoreElements()) {
bnode = (DefaultMutableTreeNode) en.nextElement();
allChildren.addElement(bnode);
theCategs.removeCategoryRelation(delCateg, (Category) bnode.getUserObject());
// delete it from the collection and the database
theCategs.deleteCategory(delCateg);
delCateg = null;
anode = null;
i++;
if (i >= allChildren.size())
moreChildren = false;
public void treeStructureChanged(TreeModelEvent e) {
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
import java.awt.*;
import javax.swing.*;
import javax.swing.tree.*;
import java.util.*;
public class CategTree {
private JTree cTree;
private DefaultTreeModel theModel;
private Project theProject;
private AllCategories theCategs;
private DefaultMutableTreeNode theRoot;
// CONSTRUCTOR
public CategTree(AllCategories categs, Project proj) {
super();
theCategs = categs;
theProject = proj;
// the Root is a non-data-based node created to root all of
// the category trees
theRoot = new DefaultMutableTreeNode("theRoot");
theModel = new DefaultTreeModel(theRoot);
cTree = new JTree(theModel);
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cTree.setCellRenderer(cnr);
cTree.setCellEditor(new CategoryNodeEditor(cTree, cnr, theCategs));
cTree.setEditable(false);
cTree.setRootVisible(false);
cTree.setExpandsSelectedPaths(true);
cTree.setScrollsOnExpand(true);
cTree.setShowsRootHandles(true);
cTree.setToggleClickCount(0);
cTree.setVisibleRowCount(20);
initializeTreeModel();
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return theModel;
public JTree getTree() {
return cTree;
public DefaultMutableTreeNode getRootNode() {
return theRoot;
public void initializeTreeModel() {
Vector allNodes = new Vector();
// insert all of the root categories in the root of the tree and
// store a ref to the node in a vector
Vector allRoots = theCategs.getAllRoots(theProject);
for (int i = 0; i < allRoots.size(); i++) {
Category nextRoot = (Category) allRoots.elementAt(i);
DefaultMutableTreeNode nextNode = new DefaultMutableTreeNode(nextRoot);
theModel.insertNodeInto(nextNode, theRoot, theRoot.getChildCount());
allNodes.addElement(nextNode);
// now insert the children of each node in the vector in the tree, and store
// it in the vector, incrementing to the end of the vector
// int totalNodes = theCategs.getCategoryCount();
boolean moreNodes = allNodes.size() > 0? true : false;
int i = 0;
while (moreNodes) {
DefaultMutableTreeNode nextParent = (DefaultMutableTreeNode) allNodes.elementAt(i);
Category parentCateg = (Category) nextParent.getUserObject();
Vector children = theCategs.getParentsChildren(parentCateg, theProject);
for (int j = 0; j < children.size(); j++) {
Category nextChild = (Category) children.elementAt(j);
DefaultMutableTreeNode nextNode = new DefaultMutableTreeNode(nextChild);
theModel.insertNodeInto(nextNode, nextParent, nextParent.getChildCount());
allNodes.addElement(nextNode);
i++;
if (i >= allNodes.size())
moreNodes = false;
theModel.reload();
public void expandAllPaths() {
Enumeration e= theRoot.depthFirstEnumeration();
while (e.hasMoreElements()) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode) e.nextElement();
cTree.makeVisible(new TreePath(node.getPath()));

JLabel ImageIcon not opaque.

Hi I am having a little problem with my program that I am trying to develop.
I have created a JFrame and instead of having the background the usual grey I have used an image.
I then wanted to create some nice big buttons with nice smooth curved edges but was having trouble using the JButton so decicded to use a JLabel and attach a MouseListener to it. This seems to be working fine at the mo.
The only problem is that instead of my nice gradient filled background being displayed I get a big white border around the JLabel. The rest of the background is perfectly displayed having only a problem around the JLabel. I have tried not using a background image and it shows the JLabel correctly and the button looks nice and smooth.
I think it might be something to do with the rendering sequence maybe but I am at a loss. If any one has any ideas on how to fix it or a better way of doing it I would be most grateful.
Many thanks for your help in advance.
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PS now heres my code:
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          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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          ImageIcon icon1 = new ImageIcon("images/buttons/addProperty.gif");
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          buttonPanel.add(addProperty);
          buttonPanel.add(tester);
     public void mousePressed(MouseEvent arg0) {
          // TODO Auto-generated method stub
          System.out.println("Button Clicked");
}

Swing related questions should be posted in the Swing forum.
Use the "code" tags when you post code so the formatting is retained.
The code you posted doesn't compile so we can't see the incorrect behaviour.
Using code I already have I do not see any white border around the image. I tested using a "Duke" image which is found in many of the Swing tutorial examples. Maybe your image is the problem.

Help with JTree's opaque methods

I have been looking through the methods provided for JTree in Netbeans GUIBuilder and I do not see accessor methods for actions like insertion, retrieval, deletion and replacement. I am looking for something like this.
JTree.insert('object', JTree.getSelectedNode());
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JTree.insert('object', JTree.getSelectedNode()) should accept to inputs; the object you wish to insert and the location you wish to insert it. JTree.getSelectedNode() would be an accessor method returning the selected node. The insert would have to find the next available element in the LinkedList, array, hashtable, stack, (or whatever it uses) and inserts the object.
JTree.getSelectedNode().getObject(); I assume that if I have apple selected in the JTree, apple will be returned.
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JTree. supplantObject(object, JTree.getSelectedNode()); overwrites the object in the selected with a new object.
These seem like the more obvious accessor methods and I am astonished to find them missing or named something inconsistent with java standards.
So I guess my question is, what are the equivalent method names for the aforementioned methods?
BM

Take a look at [http://java.sun.com/j2se/1.5.0/docs/api/javax/swing/tree/DefaultMutableTreeNode.html|http://java.sun.com/j2se/1.5.0/docs/api/javax/swing/tree/DefaultMutableTreeNode.html] which has most of the methods that you are interested in. A JTree has a single root node, which by default is of this type.

JTree not showing plus/minus signs

Hi,
I'm having a strange problem with JTree when implementing my own DefaultTreeCellRenderer: the renderer is shown correctly, but the plus and minus signs are gone!
My getTreeCellRendererComponent implementation actually creates a new JPanel and returns it instead of the default one. Can that be the problem? How can I make these plus/minus signs come back?
Thanks, U

I have seen something a little different on my CustomCellRenderer where the plus minus sign is replaced with some default arrow icon and where it comes from I have no clue. I basically have a 3 level deep tree and its at the B level where this icon appears.
http://www.matthewscorp.com/images/JTreeError.jpg
For the life of me I can't figure this one out. I have tried all ideas like set all the renderer icons or the LAF properties icons and still this blue arrow appears. Any ideas would help on both mine and the original poster.

JTable on JPanel on JFrame, not appearing

I can't see the JTable that I was expecting to between the two labels, any ideas why?
public class Workout extends JFrame {
        final String[] exercisesDoneColumnNames = {"Exercise", "# Sets", "Set 1", "Set 2", "Set 3", "Set 4", "Set 5", "Set 6", "Set 7", "Set 8", "Set 9", "Set 10"};
        private ExercisesDoneTable myModel = new ExercisesDoneTable exercisesDoneColumnNames,0);
        private JTable table = new JTable(myModel);
        public Workout() {
            super.setTitle("Workout");
            buildExerciseDoneTable();
            Toolkit tk = Toolkit.getDefaultToolkit();
            Dimension d = new Dimension();
            d = tk.getScreenSize();
            setSize((int)d.getWidth(), (int)d.getHeight());
            setLocation(0,0);
            super.setName("Workout");
            addWindowListener(new java.awt.event.WindowAdapter() {
                public void windowClosing(java.awt.event.WindowEvent evt) {
                    System.exit(0);
            JPanel p = new JPanel();
            p.setBackground(java.awt.Color.white);
            p.add(new JLabel("left of"));
            p.add(table);
            p.add(new JLabel("right of"));
            getContentPane().add(p);
            setVisible(true);
    //helper method just splits the code to make it more readable
    private void buildExerciseDoneTable(){
        table.setPreferredScrollableViewportSize(new Dimension(500,100));
        myModel.addTableModelListener(myModel);
        table.setVisible(true);
    }

JPanel has a default FlowLayout.
I think you table is there, but is not displaying anything as you have specified 0 rows when creating your table model. Change that number to 1 and you will see it appear.

JTree not updating

i've already make changes to the nodes in a jtree, then i try using
jtree.repaint();, jtree.validate();, all didn't update the display..
why is it like that?
i try using jtree.updateUI(), it works but got some problem when calling from other class(can't understand the reason) it give this error:
java.lang.NullPointerException
     at javax.swing.plaf.basic.BasicTreeUI.paintRow(BasicTreeUI.java:1309)
     at javax.swing.plaf.basic.BasicTreeUI.paint(BasicTreeUI.java:1120)
     at javax.swing.plaf.metal.MetalTreeUI.paint(MetalTreeUI.java:139)
     at javax.swing.plaf.ComponentUI.update(ComponentUI.java:39)
     at javax.swing.JComponent.paintComponent(JComponent.java:395)
     at javax.swing.JComponent.paint(JComponent.java:687)
     at javax.swing.JComponent.paintWithBuffer(JComponent.java:3878)
     at javax.swing.JComponent._paintImmediately(JComponent.java:3821)
     at javax.swing.JComponent.paintImmediately(JComponent.java:3672)
     at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:370)
     at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:124)
     at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:154)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:337)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:131)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:98)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:85)

I suppose you are adding/removing nodes of the tree using a TreeModel or TreeNode
So then calling updateUI may not be good enough
You should be firing the events fireTreeNodesRemoved/fireTreeNodesInserted
You can do the same using the methods nodesWereRemoved/nodesWereInserted
of TreeModel
Incase you are just changing some properties of the node , You may use nodesChanged

Help Menu Search Bar Transparency Not Opaque With Increase Contrast Option

Hi,
I am running OS X 10.10 and I've turned on the Reduce Transparency and the Increase Contrast options.
I've noticed, however, that with the Increase Contrast On the background of the search bar in the Help menu is transparent again and with black text (making it even harder to read then normal). If I have only the Reduce Transparency on then it is opaque as expected. It's with both Reduce Transparency and Increase Contrast on that causes this behavior.
Is this a bug that anyone else has experienced or is it just me? Any ideas how to fix this annoyance (other than turning off Increase Contrast)?
Thanks

I'm having the same problem here. Not really sure why it's not working, but checking the "synchronize with google" box seems to do nothing.

JPanel in JTree not opaque ...

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