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

    _tree = new JTree(new DefaultTreeModel(root));
    _tree.setShowsRootHandles(true);
    _tree.addTreeSelectionListener(new ObjectTreeSelectionListener());


    // Renderer for tree.
    DefaultTreeCellRenderer renderer = new DefaultTreeCellRenderer();
    SquirrelResources rsrc = _app.getResources();
    renderer.setLeafIcon(rsrc.getIcon(SquirrelResources.IImageNames.HELP_TOPIC));
    renderer.setOpenIcon(rsrc.getIcon(SquirrelResources.IImageNames.HELP_TOC_OPEN));
    renderer.setClosedIcon(rsrc.getIcon(SquirrelResources.IImageNames.HELP_TOC_CLOSED));
    _tree.setCellRenderer(renderer);


     // First put the Welcome to SQuirreL node.
     File file = appFiles.getWelcomeFile();
     try

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      Rectangle boundsBuffer = new Rectangle();
            Rectangle rowBounds = new Rectangle(0, 0, tree.getWidth(),0);
      Rectangle bounds;
      TreePath path;
            TreeCellRenderer renderer = tree.getCellRenderer();
            DefaultTreeCellRenderer dtcr = (renderer instanceof
                       DefaultTreeCellRenderer) ? (DefaultTreeCellRenderer)
                       renderer : null;


            configureRenderer(cellContext);
      while (!done && paintingEnumerator.hasMoreElements()) {

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    private void configureRenderer(SynthContext context) {
        TreeCellRenderer renderer = tree.getCellRenderer();


        if (renderer instanceof DefaultTreeCellRenderer) {
            DefaultTreeCellRenderer r = (DefaultTreeCellRenderer)renderer;
            SynthStyle style = context.getStyle();


            context.setComponentState(ENABLED | SELECTED);
            Color color = r.getTextSelectionColor();
            if (color == null || (color instanceof UIResource)) {
                r.setTextSelectionColor(style.getColor(
                                     context, ColorType.TEXT_FOREGROUND));
            }
            color = r.getBackgroundSelectionColor();
            if (color == null || (color instanceof UIResource)) {
                r.setBackgroundSelectionColor(style.getColor(
                                        context, ColorType.TEXT_BACKGROUND));
            }


            context.setComponentState(ENABLED);
            color = r.getTextNonSelectionColor();
            if (color == null || color instanceof UIResource) {
                r.setTextNonSelectionColor(style.getColorForState(
                                        context, ColorType.TEXT_FOREGROUND));
            }
            color = r.getBackgroundNonSelectionColor();
            if (color == null || color instanceof UIResource) {
                r.setBackgroundNonSelectionColor(style.getColorForState(
                                  context, ColorType.TEXT_BACKGROUND));
            }
        }
    }

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    tree.setShowsRootHandles(true); // Displays node expansion glyphs.


    TreeSelectionModel selectionModel = tree.getSelectionModel();
    selectionModel.setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);


    DefaultTreeCellRenderer cellRenderer = new DefaultTreeCellRenderer();
    cellRenderer.setLeafIcon(null);
    cellRenderer.setClosedIcon(null);
    cellRenderer.setOpenIcon(null);
    tree.setCellRenderer(cellRenderer);


    scrollPane.getViewport().add(tree, null);
  }

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    tree.setShowsRootHandles(true); // Displays node expansion glyphs.


    TreeSelectionModel selectionModel = tree.getSelectionModel();
    selectionModel.setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);


    DefaultTreeCellRenderer cellRenderer = new DefaultTreeCellRenderer();
    cellRenderer.setLeafIcon(null);
    cellRenderer.setClosedIcon(null);
    cellRenderer.setOpenIcon(null);
    tree.setCellRenderer(cellRenderer);


    scrollPane.getViewport().add(tree, null);
  }

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    this.indexTree.setBorder(BorderFactory.createEmptyBorder(2, 4, 2, 2));
    // Only one node can be selected at any one time.
    this.indexTree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
    this.indexTree.addTreeSelectionListener(new IndexTreeSelectionListener(this));
    // No icons.
    DefaultTreeCellRenderer cellRenderer = new DefaultTreeCellRenderer();
    cellRenderer.setLeafIcon(null);
    // cellRenderer.setIcon(null);
    cellRenderer.setClosedIcon(null);
    cellRenderer.setOpenIcon(null);
    this.indexTree.setCellRenderer(cellRenderer);
  }

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    this.fsTree.setBorder(BorderFactory.createEmptyBorder(2, 4, 2, 2));
    this.fsTree.setLargeModel(true);
    // Only one node can be selected at any one time.
    this.fsTree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
    this.fsTree.addTreeSelectionListener(new FSTreeSelectionListener(this));
    DefaultTreeCellRenderer cellRenderer = new DefaultTreeCellRenderer();
    cellRenderer.setLeafIcon(null);
    // cellRenderer.setIcon(null);
    cellRenderer.setClosedIcon(null);
    cellRenderer.setOpenIcon(null);
    this.fsTree.setCellRenderer(cellRenderer);
  }

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    TreeSelectionModel treeSelectionModel = new DefaultTreeSelectionModel();
    treeSelectionModel.setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
    this.typeTree.setSelectionModel(treeSelectionModel);
    JScrollPane treePane = new JScrollPane(this.typeTree);
    contentPane.setLeftComponent(treePane);
    DefaultTreeCellRenderer cellRenderer = new DefaultTreeCellRenderer();
    cellRenderer.setLeafIcon(null);
    // cellRenderer.setIcon(null);
    cellRenderer.setClosedIcon(null);
    cellRenderer.setOpenIcon(null);
    this.typeTree.setCellRenderer(cellRenderer);


    // Set up the feature table.
    this.featureTable = new JTable(new FeatureTableModel());
    JScrollPane featurePane = new JScrollPane(this.featureTable);

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        assertEquals(-20, ui.getRowHeight());
    }


    public void testSetGetCellRenderer() {
        assertTrue(ui.getCellRenderer() instanceof DefaultTreeCellRenderer);
        DefaultTreeCellRenderer r = new DefaultTreeCellRenderer();
        tree.setCellRenderer(r);
        assertEquals(r, ui.getCellRenderer());
        assertEquals(r, ui.currentCellRenderer);
        ui.setCellRenderer(new DefaultTreeCellRenderer());
        assertEquals(r, ui.currentCellRenderer);
        assertEquals(r, ui.getCellRenderer());
        ui.createdRenderer = false;
        assertFalse(ui.createdRenderer);
        ui.currentCellRenderer = null;
        ui.setCellRenderer(null);
        assertFalse(ui.createdRenderer);
        assertEquals(r, ui.currentCellRenderer);
        assertEquals(r, ui.getCellRenderer());
        tree.setCellRenderer(new DefaultTreeCellRenderer());
        assertNotNull(tree.getCellRenderer());
        assertNotNull(ui.getCellRenderer());
    }

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    }


    public void testSetGetCellEditor() {
        assertNull(ui.getCellEditor());
        DefaultTreeCellEditor editor = new DefaultTreeCellEditor(tree,
                new DefaultTreeCellRenderer());
        tree.setCellEditor(editor);
        assertEquals(editor, ui.getCellEditor());
        ui.setCellEditor(new DefaultTreeCellEditor(tree, new DefaultTreeCellRenderer()));
        assertEquals(editor, ui.getCellEditor());
    }

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