/* * Copyright (c) 2002, 2010, 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 * or visit www.oracle.com if you need additional information or have any * questions. */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;import sun.swing.plaf.synth.SynthIcon; /** * 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.     *     * @param x component to create UI object for     * @return the UI object     */    public static ComponentUI createUI(JComponent x) {        return new SynthTreeUI();    }     /**     * @inheritDoc     */    @Override    public Icon getExpandedIcon() {        return expandedIconWrapper;    }     /**     * @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.dispose();         context = getContext(tree, Region.TREE_CELL, ENABLED);        cellStyle = SynthLookAndFeel.updateStyle(context, this);        context.dispose();    }     /**     * @inheritDoc     */    @Override    protected void installListeners() {        super.installListeners();        tree.addPropertyChangeListener(this);    }     /**     * @inheritDoc     */    @Override    public SynthContext getContext(JComponent c) {        return getContext(c, SynthLookAndFeel.getComponentState(c));    }     private SynthContext getContext(JComponent c, int state) {        return SynthContext.getContext(SynthContext.class, c,                    SynthLookAndFeel.getRegion(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(SynthContext.class, 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     */    @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     */    @Override    protected TreeCellRenderer createDefaultCellRenderer() {        return new SynthTreeCellRenderer();    }     /**     * @inheritDoc     */    @Override    protected void uninstallDefaults() {        SynthContext context = getContext(tree, ENABLED);         style.uninstallDefaults(context);        context.dispose();        style = null;         context = getContext(tree, Region.TREE_CELL, ENABLED);        cellStyle.uninstallDefaults(context);        context.dispose();        cellStyle = null;          if (tree.getTransferHandler() instanceof UIResource) {            tree.setTransferHandler(null);        }    }     /**     * @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 {@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);        context.dispose();    }     /**     * @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.     * <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);        context.dispose();    }     /**     * 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();                if (path != null) {                    isLeaf = treeModel.isLeaf(path.getLastPathComponent());                    if (isLeaf) {                        isExpanded = hasBeenExpanded = false;                    }                    else {                        isExpanded = treeState.getExpandedState(path);                        hasBeenExpanded = tree.hasBeenExpanded(path);                    }                    bounds = getPathBounds(tree, 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();                if (path != null) {                    isLeaf = treeModel.isLeaf(path.getLastPathComponent());                    if (isLeaf) {                        isExpanded = hasBeenExpanded = false;                    }                    else {                        isExpanded = treeState.getExpandedState(path);                        hasBeenExpanded = tree.hasBeenExpanded(path);                    }                    bounds = getPathBounds(tree, 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++;            }        }        cellContext.dispose();         paintDropLine(g);         // Empty out the renderer pane, allowing renderers to be gc'ed.        rendererPane.removeAll();    }     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     */    @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     */    @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

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