https://openjdk.java.net/ 
/*
 * Copyright (c) 2002, 2014, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */
package javax.swing.plaf.synth;

import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.Rectangle;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.Enumeration;
import javax.swing.DefaultCellEditor;
import javax.swing.Icon;
import javax.swing.JComponent;
import javax.swing.JTextField;
import javax.swing.JTree;
import javax.swing.LookAndFeel;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.UIResource;
import javax.swing.plaf.basic.BasicTreeUI;
import javax.swing.tree.DefaultTreeCellEditor;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.TreeCellEditor;
import javax.swing.tree.TreeCellRenderer;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;


Provides the Synth L&F UI delegate for JTree. 
Author:Scott Violet
Since:1.7
/**
 * Provides the Synth L&F UI delegate for
 * {@link javax.swing.JTree}.
 *
 * @author Scott Violet
 * @since 1.7
 */
public class SynthTreeUI extends BasicTreeUI
                         implements PropertyChangeListener, SynthUI {
    private SynthStyle style;
    private SynthStyle cellStyle;

    private SynthContext paintContext;

    private boolean drawHorizontalLines;
    private boolean drawVerticalLines;

    private Object linesStyle;

    private int padding;

    private boolean useTreeColors;

    private Icon expandedIconWrapper = new ExpandedIconWrapper();

    
Creates a new UI object for the given component.

Params:
  • x – component to create UI object for
Returns:the UI object
/**
     * Creates a new UI object for the given component.
     *
     * @param x component to create UI object for
     * @return the UI object
     */
    public static ComponentUI createUI(JComponent x) {
        return new SynthTreeUI();
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    public Icon getExpandedIcon() {
        return expandedIconWrapper;
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    protected void installDefaults() {
        updateStyle(tree);
    }

    private void updateStyle(JTree tree) {
        SynthContext context = getContext(tree, ENABLED);
        SynthStyle oldStyle = style;

        style = SynthLookAndFeel.updateStyle(context, this);
        if (style != oldStyle) {
            Object value;

            setExpandedIcon(style.getIcon(context, "Tree.expandedIcon"));
            setCollapsedIcon(style.getIcon(context, "Tree.collapsedIcon"));

            setLeftChildIndent(style.getInt(context, "Tree.leftChildIndent",
                                            0));
            setRightChildIndent(style.getInt(context, "Tree.rightChildIndent",
                                             0));

            drawHorizontalLines = style.getBoolean(
                          context, "Tree.drawHorizontalLines",true);
            drawVerticalLines = style.getBoolean(
                        context, "Tree.drawVerticalLines", true);
            linesStyle = style.get(context, "Tree.linesStyle");

                value = style.get(context, "Tree.rowHeight");
                if (value != null) {
                    LookAndFeel.installProperty(tree, "rowHeight", value);
                }

                value = style.get(context, "Tree.scrollsOnExpand");
                LookAndFeel.installProperty(tree, "scrollsOnExpand",
                                                    value != null? value : Boolean.TRUE);

            padding = style.getInt(context, "Tree.padding", 0);

            largeModel = (tree.isLargeModel() && tree.getRowHeight() > 0);

            useTreeColors = style.getBoolean(context,
                                  "Tree.rendererUseTreeColors", true);

            Boolean showsRootHandles = style.getBoolean(
                    context, "Tree.showsRootHandles", Boolean.TRUE);
            LookAndFeel.installProperty(
                    tree, JTree.SHOWS_ROOT_HANDLES_PROPERTY, showsRootHandles);

            if (oldStyle != null) {
                uninstallKeyboardActions();
                installKeyboardActions();
            }
        }

        context = getContext(tree, Region.TREE_CELL, ENABLED);
        cellStyle = SynthLookAndFeel.updateStyle(context, this);
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    protected void installListeners() {
        super.installListeners();
        tree.addPropertyChangeListener(this);
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    public SynthContext getContext(JComponent c) {
        return getContext(c, SynthLookAndFeel.getComponentState(c));
    }

    private SynthContext getContext(JComponent c, int state) {
        return SynthContext.getContext(c, style, state);
    }

    private SynthContext getContext(JComponent c, Region region) {
        return getContext(c, region, getComponentState(c, region));
    }

    private SynthContext getContext(JComponent c, Region region, int state) {
        return SynthContext.getContext(c, region, cellStyle, state);
    }

    private int getComponentState(JComponent c, Region region) {
        // Always treat the cell as selected, will be adjusted appropriately
        // when painted.
        return ENABLED | SELECTED;
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    protected TreeCellEditor createDefaultCellEditor() {
        TreeCellRenderer renderer = tree.getCellRenderer();
        DefaultTreeCellEditor editor;

        if(renderer != null && (renderer instanceof DefaultTreeCellRenderer)) {
            editor = new SynthTreeCellEditor(tree, (DefaultTreeCellRenderer)
                                             renderer);
        }
        else {
            editor = new SynthTreeCellEditor(tree, null);
        }
        return editor;
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    protected TreeCellRenderer createDefaultCellRenderer() {
        return new SynthTreeCellRenderer();
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    protected void uninstallDefaults() {
        SynthContext context = getContext(tree, ENABLED);

        style.uninstallDefaults(context);
        style = null;

        context = getContext(tree, Region.TREE_CELL, ENABLED);
        cellStyle.uninstallDefaults(context);
        cellStyle = null;


        if (tree.getTransferHandler() instanceof UIResource) {
            tree.setTransferHandler(null);
        }
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    protected void uninstallListeners() {
        super.uninstallListeners();
        tree.removePropertyChangeListener(this);
    }

    
Notifies this UI delegate to repaint the specified component. This method paints the component background, then calls the paint(SynthContext, Graphics) method. 
In general, this method does not need to be overridden by subclasses. All Look and Feel rendering code should reside in the paint method. 
Params:
  • g – the Graphics object used for painting
  • c – the component being painted
See Also:
/**
     * Notifies this UI delegate to repaint the specified component.
     * This method paints the component background, then calls
     * the {@link #paint(SynthContext,Graphics)} method.
     *
     * <p>In general, this method does not need to be overridden by subclasses.
     * All Look and Feel rendering code should reside in the {@code paint} method.
     *
     * @param g the {@code Graphics} object used for painting
     * @param c the component being painted
     * @see #paint(SynthContext,Graphics)
     */
    @Override
    public void update(Graphics g, JComponent c) {
        SynthContext context = getContext(c);

        SynthLookAndFeel.update(context, g);
        context.getPainter().paintTreeBackground(context,
                          g, 0, 0, c.getWidth(), c.getHeight());
        paint(context, g);
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    public void paintBorder(SynthContext context, Graphics g, int x,
                            int y, int w, int h) {
        context.getPainter().paintTreeBorder(context, g, x, y, w, h);
    }

    
Paints the specified component according to the Look and Feel.

This method is not used by Synth Look and Feel. Painting is handled by the paint(SynthContext, Graphics) method. 
Params:
  • g – the Graphics object used for painting
  • c – the component being painted
See Also:
/**
     * Paints the specified component according to the Look and Feel.
     * <p>This method is not used by Synth Look and Feel.
     * Painting is handled by the {@link #paint(SynthContext,Graphics)} method.
     *
     * @param g the {@code Graphics} object used for painting
     * @param c the component being painted
     * @see #paint(SynthContext,Graphics)
     */
    @Override
    public void paint(Graphics g, JComponent c) {
        SynthContext context = getContext(c);

        paint(context, g);
    }

    
Paints the specified component.

Params:
  • context – context for the component being painted
  • g – the Graphics object used for painting
See Also:
/**
     * Paints the specified component.
     *
     * @param context context for the component being painted
     * @param g the {@code Graphics} object used for painting
     * @see #update(Graphics,JComponent)
     */
    protected void paint(SynthContext context, Graphics g) {
        paintContext = context;

        updateLeadSelectionRow();

        Rectangle paintBounds = g.getClipBounds();
        Insets insets = tree.getInsets();
        TreePath initialPath = getClosestPathForLocation(tree, 0,
                                                         paintBounds.y);
        Enumeration<?> paintingEnumerator = treeState.getVisiblePathsFrom
                                              (initialPath);
        int row = treeState.getRowForPath(initialPath);
        int endY = paintBounds.y + paintBounds.height;
        TreeModel treeModel = tree.getModel();
        SynthContext cellContext = getContext(tree, Region.TREE_CELL);

        drawingCache.clear();

        setHashColor(context.getStyle().getColor(context,
                                                ColorType.FOREGROUND));

        if (paintingEnumerator != null) {
            // First pass, draw the rows

            boolean done = false;
            boolean isExpanded;
            boolean hasBeenExpanded;
            boolean isLeaf;
            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()) {
                path = (TreePath)paintingEnumerator.nextElement();
                bounds = getPathBounds(tree, path);
                if ((path != null) && (bounds != null)) {
                    isLeaf = treeModel.isLeaf(path.getLastPathComponent());
                    if (isLeaf) {
                        isExpanded = hasBeenExpanded = false;
                    }
                    else {
                        isExpanded = treeState.getExpandedState(path);
                        hasBeenExpanded = tree.hasBeenExpanded(path);
                    }
                    rowBounds.y = bounds.y;
                    rowBounds.height = bounds.height;
                    paintRow(renderer, dtcr, context, cellContext, g,
                             paintBounds, insets, bounds, rowBounds, path,
                             row, isExpanded, hasBeenExpanded, isLeaf);
                    if ((bounds.y + bounds.height) >= endY) {
                        done = true;
                    }
                }
                else {
                    done = true;
                }
                row++;
            }

            // Draw the connecting lines and controls.
            // Find each parent and have them draw a line to their last child
            boolean rootVisible = tree.isRootVisible();
            TreePath parentPath = initialPath;
            parentPath = parentPath.getParentPath();
            while (parentPath != null) {
                paintVerticalPartOfLeg(g, paintBounds, insets, parentPath);
                drawingCache.put(parentPath, Boolean.TRUE);
                parentPath = parentPath.getParentPath();
            }
            done = false;
            paintingEnumerator = treeState.getVisiblePathsFrom(initialPath);
            while (!done && paintingEnumerator.hasMoreElements()) {
                path = (TreePath)paintingEnumerator.nextElement();
                bounds = getPathBounds(tree, path);
                if ((path != null) && (bounds != null)) {
                    isLeaf = treeModel.isLeaf(path.getLastPathComponent());
                    if (isLeaf) {
                        isExpanded = hasBeenExpanded = false;
                    }
                    else {
                        isExpanded = treeState.getExpandedState(path);
                        hasBeenExpanded = tree.hasBeenExpanded(path);
                    }
                    // See if the vertical line to the parent has been drawn.
                    parentPath = path.getParentPath();
                    if (parentPath != null) {
                        if (drawingCache.get(parentPath) == null) {
                            paintVerticalPartOfLeg(g, paintBounds, insets,
                                                   parentPath);
                            drawingCache.put(parentPath, Boolean.TRUE);
                        }
                        paintHorizontalPartOfLeg(g,
                                                 paintBounds, insets, bounds,
                                                 path, row, isExpanded,
                                                 hasBeenExpanded, isLeaf);
                    }
                    else if (rootVisible && row == 0) {
                        paintHorizontalPartOfLeg(g,
                                                 paintBounds, insets, bounds,
                                                 path, row, isExpanded,
                                                 hasBeenExpanded, isLeaf);
                    }
                    if (shouldPaintExpandControl(path, row, isExpanded,
                                                 hasBeenExpanded, isLeaf)) {
                        paintExpandControl(g, paintBounds,
                                           insets, bounds, path, row,
                                           isExpanded, hasBeenExpanded,isLeaf);
                    }
                    if ((bounds.y + bounds.height) >= endY) {
                        done = true;
                    }
                }
                else {
                    done = true;
                }
                row++;
            }
        }

        paintDropLine(g);

        // Empty out the renderer pane, allowing renderers to be gc'ed.
        rendererPane.removeAll();

        paintContext = null;
    }

    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));
            }
        }
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    protected void paintHorizontalPartOfLeg(Graphics g, Rectangle clipBounds,
                                            Insets insets, Rectangle bounds,
                                            TreePath path, int row,
                                            boolean isExpanded,
                                            boolean hasBeenExpanded, boolean
                                            isLeaf) {
        if (drawHorizontalLines) {
            super.paintHorizontalPartOfLeg(g, clipBounds, insets, bounds,
                                           path, row, isExpanded,
                                           hasBeenExpanded, isLeaf);
        }
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    protected void paintHorizontalLine(Graphics g, JComponent c, int y,
                                      int left, int right) {
        paintContext.getStyle().getGraphicsUtils(paintContext).drawLine(
            paintContext, "Tree.horizontalLine", g, left, y, right, y, linesStyle);
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    protected void paintVerticalPartOfLeg(Graphics g,
                                          Rectangle clipBounds, Insets insets,
                                          TreePath path) {
        if (drawVerticalLines) {
            super.paintVerticalPartOfLeg(g, clipBounds, insets, path);
        }
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    protected void paintVerticalLine(Graphics g, JComponent c, int x, int top,
                                    int bottom) {
        paintContext.getStyle().getGraphicsUtils(paintContext).drawLine(
            paintContext, "Tree.verticalLine", g, x, top, x, bottom, linesStyle);
    }

    private void paintRow(TreeCellRenderer renderer,
               DefaultTreeCellRenderer dtcr, SynthContext treeContext,
               SynthContext cellContext, Graphics g, Rectangle clipBounds,
               Insets insets, Rectangle bounds, Rectangle rowBounds,
               TreePath path, int row, boolean isExpanded,
               boolean hasBeenExpanded, boolean isLeaf) {
        // Don't paint the renderer if editing this row.
        boolean selected = tree.isRowSelected(row);

        JTree.DropLocation dropLocation = tree.getDropLocation();
        boolean isDrop = dropLocation != null
                         && dropLocation.getChildIndex() == -1
                         && path == dropLocation.getPath();

        int state = ENABLED;
        if (selected || isDrop) {
            state |= SELECTED;
        }

        if (tree.isFocusOwner() && row == getLeadSelectionRow()) {
            state |= FOCUSED;
        }

        cellContext.setComponentState(state);

        if (dtcr != null && (dtcr.getBorderSelectionColor() instanceof
                             UIResource)) {
            dtcr.setBorderSelectionColor(style.getColor(
                                             cellContext, ColorType.FOCUS));
        }
        SynthLookAndFeel.updateSubregion(cellContext, g, rowBounds);
        cellContext.getPainter().paintTreeCellBackground(cellContext, g,
                    rowBounds.x, rowBounds.y, rowBounds.width,
                    rowBounds.height);
        cellContext.getPainter().paintTreeCellBorder(cellContext, g,
                    rowBounds.x, rowBounds.y, rowBounds.width,
                    rowBounds.height);
        if (editingComponent != null && editingRow == row) {
            return;
        }

        int leadIndex;

        if (tree.hasFocus()) {
            leadIndex = getLeadSelectionRow();
        }
        else {
            leadIndex = -1;
        }

        Component component = renderer.getTreeCellRendererComponent(
                         tree, path.getLastPathComponent(),
                         selected, isExpanded, isLeaf, row,
                         (leadIndex == row));

        rendererPane.paintComponent(g, component, tree, bounds.x, bounds.y,
                                    bounds.width, bounds.height, true);
    }

    private int findCenteredX(int x, int iconWidth) {
        return tree.getComponentOrientation().isLeftToRight()
               ? x - (int)Math.ceil(iconWidth / 2.0)
               : x - (int)Math.floor(iconWidth / 2.0);
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    protected void paintExpandControl(Graphics g, Rectangle clipBounds,
            Insets insets, Rectangle bounds, TreePath path, int row,
            boolean isExpanded, boolean hasBeenExpanded, boolean isLeaf) {
        //modify the paintContext's state to match the state for the row
        //this is a hack in that it requires knowledge of the subsequent
        //method calls. The point is, the context used in drawCentered
        //should reflect the state of the row, not of the tree.
        boolean isSelected = tree.getSelectionModel().isPathSelected(path);
        int state = paintContext.getComponentState();
        if (isSelected) {
            paintContext.setComponentState(state | SynthConstants.SELECTED);
        }
        super.paintExpandControl(g, clipBounds, insets, bounds, path, row,
                isExpanded, hasBeenExpanded, isLeaf);
        paintContext.setComponentState(state);
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    protected void drawCentered(Component c, Graphics graphics, Icon icon,
                                int x, int y) {
        int w = SynthGraphicsUtils.getIconWidth(icon, paintContext);
        int h = SynthGraphicsUtils.getIconHeight(icon, paintContext);

        SynthGraphicsUtils.paintIcon(icon, paintContext, graphics,
                            findCenteredX(x, w),
                            y - h/2, w, h);
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    public void propertyChange(PropertyChangeEvent event) {
        if (SynthLookAndFeel.shouldUpdateStyle(event)) {
            updateStyle((JTree)event.getSource());
        }

        if ("dropLocation" == event.getPropertyName()) {
            JTree.DropLocation oldValue = (JTree.DropLocation)event.getOldValue();
            repaintDropLocation(oldValue);
            repaintDropLocation(tree.getDropLocation());
        }
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    protected void paintDropLine(Graphics g) {
        JTree.DropLocation loc = tree.getDropLocation();
        if (!isDropLine(loc)) {
            return;
        }

        Color c = (Color)style.get(paintContext, "Tree.dropLineColor");
        if (c != null) {
            g.setColor(c);
            Rectangle rect = getDropLineRect(loc);
            g.fillRect(rect.x, rect.y, rect.width, rect.height);
        }
    }

    private void repaintDropLocation(JTree.DropLocation loc) {
        if (loc == null) {
            return;
        }

        Rectangle r;

        if (isDropLine(loc)) {
            r = getDropLineRect(loc);
        } else {
            r = tree.getPathBounds(loc.getPath());
            if (r != null) {
                r.x = 0;
                r.width = tree.getWidth();
            }
        }

        if (r != null) {
            tree.repaint(r);
        }
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    protected int getRowX(int row, int depth) {
        return super.getRowX(row, depth) + padding;
    }

    @SuppressWarnings("serial") // Superclass is not serializable across versions
    private class SynthTreeCellRenderer extends DefaultTreeCellRenderer
                               implements UIResource {
        SynthTreeCellRenderer() {
        }

        @Override
        public String getName() {
            return "Tree.cellRenderer";
        }

        @Override
        public Component getTreeCellRendererComponent(JTree tree, Object value,
                                                      boolean sel,
                                                      boolean expanded,
                                                      boolean leaf, int row,
                                                      boolean hasFocus) {
            if (!useTreeColors && (sel || hasFocus)) {
                SynthLookAndFeel.setSelectedUI((SynthLabelUI)SynthLookAndFeel.
                             getUIOfType(getUI(), SynthLabelUI.class),
                                   sel, hasFocus, tree.isEnabled(), false);
            }
            else {
                SynthLookAndFeel.resetSelectedUI();
            }
            return super.getTreeCellRendererComponent(tree, value, sel,
                                                      expanded, leaf, row, hasFocus);
        }

        @Override
        public void paint(Graphics g) {
            paintComponent(g);
            if (hasFocus) {
                SynthContext context = getContext(tree, Region.TREE_CELL);

                if (context.getStyle() == null) {
                    assert false: "SynthTreeCellRenderer is being used " +
                        "outside of UI that created it";
                    return;
                }
                int imageOffset = 0;
                Icon currentI = getIcon();

                if(currentI != null && getText() != null) {
                    imageOffset = currentI.getIconWidth() +
                                          Math.max(0, getIconTextGap() - 1);
                }
                if (selected) {
                    context.setComponentState(ENABLED | SELECTED);
                }
                else {
                    context.setComponentState(ENABLED);
                }
                if(getComponentOrientation().isLeftToRight()) {
                    context.getPainter().paintTreeCellFocus(context, g,
                            imageOffset, 0, getWidth() - imageOffset,
                            getHeight());
                }
                else {
                    context.getPainter().paintTreeCellFocus(context, g,
                            0, 0, getWidth() - imageOffset, getHeight());
                }
            }
            SynthLookAndFeel.resetSelectedUI();
        }
    }


    private static class SynthTreeCellEditor extends DefaultTreeCellEditor {
        public SynthTreeCellEditor(JTree tree,
                                   DefaultTreeCellRenderer renderer) {
            super(tree, renderer);
            setBorderSelectionColor(null);
        }

        @Override
        protected TreeCellEditor createTreeCellEditor() {
            @SuppressWarnings("serial") // anonymous class
            JTextField tf = new JTextField() {
                @Override
                public String getName() {
                    return "Tree.cellEditor";
                }
            };
            DefaultCellEditor editor = new DefaultCellEditor(tf);

            // One click to edit.
            editor.setClickCountToStart(1);
            return editor;
        }
    }

    //
    // BasicTreeUI directly uses expandIcon outside of the Synth methods.
    // To get the correct context we return an instance of this that fetches
    // the SynthContext as needed.
    //
    private class ExpandedIconWrapper implements SynthIcon {
        public void paintIcon(SynthContext context, Graphics g, int x,
                              int y, int w, int h) {
            if (context == null) {
                context = getContext(tree);
                SynthGraphicsUtils.paintIcon(expandedIcon, context, g, x, y, w, h);
            }
            else {
                SynthGraphicsUtils.paintIcon(expandedIcon, context, g, x, y, w, h);
            }
        }

        public int getIconWidth(SynthContext context) {
            int width;
            if (context == null) {
                context = getContext(tree);
                width = SynthGraphicsUtils.getIconWidth(expandedIcon, context);
            }
            else {
                width = SynthGraphicsUtils.getIconWidth(expandedIcon, context);
            }
            return width;
        }

        public int getIconHeight(SynthContext context) {
            int height;
            if (context == null) {
                context = getContext(tree);
                height = SynthGraphicsUtils.getIconHeight(expandedIcon, context);
            }
            else {
                height = SynthGraphicsUtils.getIconHeight(expandedIcon, context);
            }
            return height;
        }
    }
}