Examples of javax.swing.tree.DefaultTreeCellRenderer

javax.swing.tree.DefaultTreeCellRenderer

oracle.com/javase/tutorial/uiswing/components/tree.html">How to Use Trees in The Java Tutorial for examples of customizing node display using this class.

The set of icons and colors used by {@code DefaultTreeCellRenderer}can be configured using the various setter methods. The value for each property is initialized from the defaults table. When the look and feel changes ( {@code updateUI} is invoked), any propertiesthat have a value of type {@code UIResource} are refreshed from thedefaults table. The following table lists the mapping between {@code DefaultTreeCellRenderer} property and defaults table key:

Property:	Key:
"leafIcon"	"Tree.leafIcon"
"closedIcon"	"Tree.closedIcon"
"openIcon"	"Tree.openIcon"
"textSelectionColor"	"Tree.selectionForeground"
"textNonSelectionColor"	"Tree.textForeground"
"backgroundSelectionColor"	"Tree.selectionBackground"
"backgroundNonSelectionColor"	"Tree.textBackground"
"borderSelectionColor"	"Tree.selectionBorderColor"

Implementation Note: This class overrides invalidate, validate, revalidate, repaint, and firePropertyChange solely to improve performance. If not overridden, these frequently called methods would execute code paths that are unnecessary for the default tree cell renderer. If you write your own renderer, take care to weigh the benefits and drawbacks of overriding these methods.

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans™ has been added to the java.beans package. Please see {@link java.beans.XMLEncoder}. @author Rob Davis @author Ray Ryan @author Scott Violet


        private void setupRendererUI() {
            panel = new JPanel();
            panel.setLayout(new BoxLayout(panel, BoxLayout.X_AXIS));


            nameRenderer = new DefaultTreeCellRenderer();
            descriptionRenderer = new DefaultTreeCellRenderer();


            panel.add(nameRenderer);
            seperator = Box.createHorizontalStrut(10);
            panel.add(seperator);
            panel.add(descriptionRenderer);

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      }   
  }


  /** For subclasses to specialize*/
  protected TreeCellRenderer createRenderer() {
    return new DefaultTreeCellRenderer();
  }

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        helpTree.setRootVisible(false);
        helpTree.setShowsRootHandles(true);
        helpTree.addTreeSelectionListener(this);


        // Renderer
        DefaultTreeCellRenderer  helpTreeRenderer = (DefaultTreeCellRenderer) helpTree.getCellRenderer();
        helpTreeRenderer.setOpenIcon(resources.getIcon("folderIcon"));
        helpTreeRenderer.setClosedIcon(resources.getIcon("folderIcon"));
        helpTreeRenderer.setLeafIcon(resources.getIcon("leafIcon"));


        createHelpContents();




        // Create help search panel


        // search tree
        searchRootTreeNode = new DefaultMutableTreeNode();
        searchTreeModel = new DefaultTreeModel(searchRootTreeNode);
        searchTree = new JTree();
        searchTree.setModel(searchTreeModel);
        searchTree.setRootVisible(false);
        searchTree.setShowsRootHandles(true);
        searchTree.addTreeSelectionListener(this);


        JScrollPane scrollSearchTree = new JScrollPane(searchTree, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,JScrollPane.HORIZONTAL_SCROLLBAR_NEVER );


        DefaultTreeCellRenderer  searchTreeRenderer = (DefaultTreeCellRenderer) searchTree.getCellRenderer();
        searchTreeRenderer.setOpenIcon(resources.getIcon("folderIcon"));
        searchTreeRenderer.setClosedIcon(resources.getIcon("folderIcon"));
        searchTreeRenderer.setLeafIcon(resources.getIcon("leafIcon"));




        // search field
        JToolBar  toolbar = new JToolBar();
        toolbar.setRollover(true);

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    private void setupTree() {
        root = new DefaultMutableTreeNode(resources.getString("preferences"));
        topNode = new DefaultMutableTreeNode(resources.getString("preferences"));
        root.add(topNode);


        DefaultTreeCellRenderer renderer = new DefaultTreeCellRenderer() {
            public Component getTreeCellRendererComponent(JTree tree,
                    Object value, boolean sel, boolean expanded, boolean leaf,
                    int row, boolean hasFocus) {
                super.getTreeCellRendererComponent(tree, value, sel, expanded,
                        leaf, row, hasFocus);


                DefaultMutableTreeNode node = (DefaultMutableTreeNode) value;
                setText(((String) node.getUserObject()).replaceAll("^a\\d+ ",
                        ""));


                return this;
            }
        };
        renderer.setLeafIcon(null);


        Iterator i = prefsDialog.getPanels().keySet().iterator();


        while (i.hasNext()) {
            topNode.add(new DefaultMutableTreeNode((String) i.next()));

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    public static final Color EXCEPTION_BG_COLOR = Color.red;
    
    private TreeNodeInfo executingNodeInfo;


    public Component getTreeCellRendererComponent(JTree tree, Object value, boolean sel, boolean expanded, boolean leaf, int row, boolean hasFocus) {
        DefaultTreeCellRenderer renderer = (DefaultTreeCellRenderer) super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf, row, hasFocus);
        if (value instanceof DefaultMutableTreeNode) {
            DefaultMutableTreeNode defaultMutableTreeNode = (DefaultMutableTreeNode) value;
            Object userObject =  defaultMutableTreeNode.getUserObject();
            if (userObject instanceof TreeNodeInfo) {
                TreeNodeInfo treeNodeInfo = (TreeNodeInfo) userObject;


                renderer.setToolTipText(null);


                if ( treeNodeInfo.hasException() ) {
                    renderer.setForeground(EXCEPTION_COLOR);
                    renderer.setBackgroundNonSelectionColor(EXCEPTION_BG_COLOR);
                    String msg = treeNodeInfo.getException().getMessage();
                    renderer.setToolTipText(msg == null ? "Error" : msg);
                } else {
                    renderer.setBackgroundNonSelectionColor(executingNodeInfo == treeNodeInfo ? RUNNING_BG_COLOR : Color.white);
                    if (!sel && executingNodeInfo != treeNodeInfo) {
                        if (treeNodeInfo.getExecutionCount() > 0) {
                            renderer.setForeground(EXECUTED_COLOR);
                        }
                    }
                }


                Icon icon = treeNodeInfo.getIcon();
                if (icon != null) {
                    renderer.setIcon(icon);
                }
            }
        }


        return renderer;

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        tree = new JTree(topNode);
        tree.setRootVisible(false);
        tree.setShowsRootHandles(true);
        tree.setBorder( new EmptyBorder(5, 5, 5, 5) );
        tree.setCellRenderer(new DefaultTreeCellRenderer() {
            public Component getTreeCellRendererComponent(JTree tree, Object value, boolean sel, boolean expanded, boolean leaf, int row, boolean hasFocus) {
                DefaultTreeCellRenderer renderer = (DefaultTreeCellRenderer) super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf, row, hasFocus);
                if (value instanceof DefaultMutableTreeNode) {
                    DefaultMutableTreeNode defaultMutableTreeNode = (DefaultMutableTreeNode) value;
                    Object userObject =  defaultMutableTreeNode.getUserObject();
                    if (userObject instanceof TopicInfo) {
                        TopicInfo topicInfo = (TopicInfo) userObject;
                        renderer.setIcon( topicInfo.subtopicCount == 0 ? ResourceManager.HELPTOPIC_ICON : ResourceManager.HELPDIR_ICON );
                    }
                }
                return renderer;
            }
        });

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      // Must be registered for renderer tooltips to work
      ToolTipManager.sharedInstance().registerComponent(recordTree);


      // Load leaf icon for the tree cell renderer.
      TreeCellRenderer renderer = new DefaultTreeCellRenderer() {
          public Component getTreeCellRendererComponent(JTree tree,
                                                        Object value,
                                                        boolean sel,
                                                        boolean expanded,
                                                        boolean leaf,

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      super.updateUI();
      // Make the tree's cell renderer use the table's cell selection
      // colors.
      TreeCellRenderer tcr = getCellRenderer();
      if (tcr instanceof DefaultTreeCellRenderer) {
        DefaultTreeCellRenderer dtcr = ((DefaultTreeCellRenderer) tcr);
        // For 1.1 uncomment this, 1.2 has a bug that will cause an
        // exception to be thrown if the border selection color is
        // null.
        // dtcr.setBorderSelectionColor(null);
        dtcr.setTextSelectionColor(UIManager.getColor("Table.selectionForeground"));
        dtcr.setBackgroundSelectionColor(UIManager.getColor("Table.selectionBackground"));
      }
    }

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      visibleRow = row;
      setBackground(background);


      TreeCellRenderer tcr = getCellRenderer();
      if (tcr instanceof DefaultTreeCellRenderer) {
        DefaultTreeCellRenderer dtcr = ((DefaultTreeCellRenderer) tcr);
        if (isSelected) {
          dtcr.setTextSelectionColor(foreground);
          dtcr.setBackgroundSelectionColor(background);
        } else {
          dtcr.setTextNonSelectionColor(foreground);
          dtcr.setBackgroundNonSelectionColor(background);
        }
      }
      return this;
    }

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        this.jTreeModel = treeModel;
        tree = new JTree(treeModel);
        tree.setRootVisible(false);
        tree.setShowsRootHandles(true);


        DefaultTreeCellRenderer treeRenderer = new DefaultTreeCellRenderer();
        treeRenderer.setClosedIcon(null);
        treeRenderer.setLeafIcon(null);
        treeRenderer.setOpenIcon(null);


        tree.setCellRenderer(treeRenderer);


        tree.addMouseListener(new MouseAdapter() {
            public void mousePressed(MouseEvent e) {

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