/*

 * Copyright (c) 1997, 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package javax.swing.tree;

import java.awt.Color;

import java.awt.Component;

import java.awt.Dimension;

import java.awt.Font;

import java.awt.Graphics;

import java.awt.Insets;

import java.awt.Rectangle;

import javax.swing.plaf.ColorUIResource;

import javax.swing.plaf.FontUIResource;

import javax.swing.plaf.UIResource;

import javax.swing.plaf.basic.BasicGraphicsUtils;

import javax.swing.Icon;

import javax.swing.JLabel;

import javax.swing.JTree;

import javax.swing.LookAndFeel;

import javax.swing.UIManager;

import javax.swing.border.EmptyBorder;

import sun.swing.DefaultLookup;

/**

 * Displays an entry in a tree.

 * <code>DefaultTreeCellRenderer</code> is not opaque and

 * unless you subclass paint you should not change this.

 * See <a

 href="http://docs.oracle.com/javase/tutorial/uiswing/components/tree.html">How to Use Trees</a>

 * in <em>The Java Tutorial</em>

 * for examples of customizing node display using this class.

 * <p>

 * 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 properties

 * that have a value of type {@code UIResource} are refreshed from the

 * defaults table. The following table lists the mapping between

 * {@code DefaultTreeCellRenderer} property and defaults table key:

 * <table border="1" cellpadding="1" cellspacing="0" summary="">

 *   <tr valign="top"  align="left">

 *     <th style="background-color:#CCCCFF" align="left">Property:

 *     <th style="background-color:#CCCCFF" align="left">Key:

 *   <tr><td>"leafIcon"<td>"Tree.leafIcon"

 *   <tr><td>"closedIcon"<td>"Tree.closedIcon"

 *   <tr><td>"openIcon"<td>"Tree.openIcon"

 *   <tr><td>"textSelectionColor"<td>"Tree.selectionForeground"

 *   <tr><td>"textNonSelectionColor"<td>"Tree.textForeground"

 *   <tr><td>"backgroundSelectionColor"<td>"Tree.selectionBackground"

 *   <tr><td>"backgroundNonSelectionColor"<td>"Tree.textBackground"

 *   <tr><td>"borderSelectionColor"<td>"Tree.selectionBorderColor"

 * </table>

 * <p>

 * <strong><a name="override">Implementation Note:</a></strong>

 * This class overrides

 * <code>invalidate</code>,

 * <code>validate</code>,

 * <code>revalidate</code>,

 * <code>repaint</code>,

 * and

 * <code>firePropertyChange</code>

 * 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.

 *

 * <p>

 * <strong>Warning:</strong>

 * 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 <code>java.beans</code> package.

 * Please see {@link java.beans.XMLEncoder}.

 *

 * @author Rob Davis

 * @author Ray Ryan

 * @author Scott Violet

 */

@SuppressWarnings("serial") // Same-version serialization only

public class DefaultTreeCellRenderer extends JLabel implements TreeCellRenderer

{

    /** Last tree the renderer was painted in. */

    private JTree tree;

    /** Is the value currently selected. */

    protected boolean selected;

    /** True if has focus. */

    protected boolean hasFocus;

    /** True if draws focus border around icon as well. */

    private boolean drawsFocusBorderAroundIcon;

    /** If true, a dashed line is drawn as the focus indicator. */

    private boolean drawDashedFocusIndicator;

    // If drawDashedFocusIndicator is true, the following are used.

    /**

     * Background color of the tree.

     */

    private Color treeBGColor;

    /**

     * Color to draw the focus indicator in, determined from the background.

     * color.

     */

    private Color focusBGColor;

    // Icons

    /** Icon used to show non-leaf nodes that aren't expanded. */

    transient protected Icon closedIcon;

    /** Icon used to show leaf nodes. */

    transient protected Icon leafIcon;

    /** Icon used to show non-leaf nodes that are expanded. */

    transient protected Icon openIcon;

    // Colors

    /** Color to use for the foreground for selected nodes. */

    protected Color textSelectionColor;

    /** Color to use for the foreground for non-selected nodes. */

    protected Color textNonSelectionColor;

    /** Color to use for the background when a node is selected. */

    protected Color backgroundSelectionColor;

    /** Color to use for the background when the node isn't selected. */

    protected Color backgroundNonSelectionColor;

    /** Color to use for the focus indicator when the node has focus. */

    protected Color borderSelectionColor;

    private boolean isDropCell;

    private boolean fillBackground;

    /**

     * Set to true after the constructor has run.

     */

    private boolean inited;

    /**

     * Creates a {@code DefaultTreeCellRenderer}. Icons and text color are

     * determined from the {@code UIManager}.

     */

    public DefaultTreeCellRenderer() {

        inited = true;

    }

    /**

     * {@inheritDoc}

     *

     * @since 1.7

     */

    public void updateUI() {

        super.updateUI();

        // To avoid invoking new methods from the constructor, the

        // inited field is first checked. If inited is false, the constructor

        // has not run and there is no point in checking the value. As

        // all look and feels have a non-null value for these properties,

        // a null value means the developer has specifically set it to

        // null. As such, if the value is null, this does not reset the

        // value.

        if (!inited || (getLeafIcon() instanceof UIResource)) {

            setLeafIcon(DefaultLookup.getIcon(this, ui, "Tree.leafIcon"));

        }

        if (!inited || (getClosedIcon() instanceof UIResource)) {

            setClosedIcon(DefaultLookup.getIcon(this, ui, "Tree.closedIcon"));

        }

        if (!inited || (getOpenIcon() instanceof UIResource)) {

            setOpenIcon(DefaultLookup.getIcon(this, ui, "Tree.openIcon"));

        }

        if (!inited || (getTextSelectionColor() instanceof UIResource)) {

            setTextSelectionColor(

                    DefaultLookup.getColor(this, ui, "Tree.selectionForeground"));

        }

        if (!inited || (getTextNonSelectionColor() instanceof UIResource)) {

            setTextNonSelectionColor(

                    DefaultLookup.getColor(this, ui, "Tree.textForeground"));

        }

        if (!inited || (getBackgroundSelectionColor() instanceof UIResource)) {

            setBackgroundSelectionColor(

                    DefaultLookup.getColor(this, ui, "Tree.selectionBackground"));

        }

        if (!inited ||

                (getBackgroundNonSelectionColor() instanceof UIResource)) {

            setBackgroundNonSelectionColor(

                    DefaultLookup.getColor(this, ui, "Tree.textBackground"));

        }

        if (!inited || (getBorderSelectionColor() instanceof UIResource)) {

            setBorderSelectionColor(

                    DefaultLookup.getColor(this, ui, "Tree.selectionBorderColor"));

        }

        drawsFocusBorderAroundIcon = DefaultLookup.getBoolean(

                this, ui, "Tree.drawsFocusBorderAroundIcon", false);

        drawDashedFocusIndicator = DefaultLookup.getBoolean(

                this, ui, "Tree.drawDashedFocusIndicator", false);

        fillBackground = DefaultLookup.getBoolean(this, ui, "Tree.rendererFillBackground", true);

        Insets margins = DefaultLookup.getInsets(this, ui, "Tree.rendererMargins");

        if (margins != null) {

            setBorder(new EmptyBorder(margins.top, margins.left,

                    margins.bottom, margins.right));

        }

        setName("Tree.cellRenderer");

    }

    /**

      * Returns the default icon, for the current laf, that is used to

      * represent non-leaf nodes that are expanded.

      */

    public Icon getDefaultOpenIcon() {

        return DefaultLookup.getIcon(this, ui, "Tree.openIcon");

    }

    /**

      * Returns the default icon, for the current laf, that is used to

      * represent non-leaf nodes that are not expanded.

      */

    public Icon getDefaultClosedIcon() {

        return DefaultLookup.getIcon(this, ui, "Tree.closedIcon");

    }

    /**

      * Returns the default icon, for the current laf, that is used to

      * represent leaf nodes.

      */

    public Icon getDefaultLeafIcon() {

        return DefaultLookup.getIcon(this, ui, "Tree.leafIcon");

    }

    /**

      * Sets the icon used to represent non-leaf nodes that are expanded.

      */

    public void setOpenIcon(Icon newIcon) {

        openIcon = newIcon;

    }

    /**

      * Returns the icon used to represent non-leaf nodes that are expanded.

      */

    public Icon getOpenIcon() {

        return openIcon;

    }

    /**

      * Sets the icon used to represent non-leaf nodes that are not expanded.

      */

    public void setClosedIcon(Icon newIcon) {

        closedIcon = newIcon;

    }

    /**

      * Returns the icon used to represent non-leaf nodes that are not

      * expanded.

      */

    public Icon getClosedIcon() {

        return closedIcon;

    }

    /**

      * Sets the icon used to represent leaf nodes.

      */

    public void setLeafIcon(Icon newIcon) {

        leafIcon = newIcon;

    }

    /**

      * Returns the icon used to represent leaf nodes.

      */

    public Icon getLeafIcon() {

        return leafIcon;

    }

    /**

      * Sets the color the text is drawn with when the node is selected.

      */

    public void setTextSelectionColor(Color newColor) {

        textSelectionColor = newColor;

    }

    /**

      * Returns the color the text is drawn with when the node is selected.

      */

    public Color getTextSelectionColor() {

        return textSelectionColor;

    }

    /**

      * Sets the color the text is drawn with when the node isn't selected.

      */

    public void setTextNonSelectionColor(Color newColor) {

        textNonSelectionColor = newColor;

    }

    /**

      * Returns the color the text is drawn with when the node isn't selected.

      */

    public Color getTextNonSelectionColor() {

        return textNonSelectionColor;

    }

    /**

      * Sets the color to use for the background if node is selected.

      */

    public void setBackgroundSelectionColor(Color newColor) {

        backgroundSelectionColor = newColor;

    }

    /**

      * Returns the color to use for the background if node is selected.

      */

    public Color getBackgroundSelectionColor() {

        return backgroundSelectionColor;

    }

    /**

      * Sets the background color to be used for non selected nodes.

      */

    public void setBackgroundNonSelectionColor(Color newColor) {

        backgroundNonSelectionColor = newColor;

    }

    /**

      * Returns the background color to be used for non selected nodes.

      */

    public Color getBackgroundNonSelectionColor() {

        return backgroundNonSelectionColor;

    }

    /**

      * Sets the color to use for the border.

      */

    public void setBorderSelectionColor(Color newColor) {

        borderSelectionColor = newColor;

    }

    /**

      * Returns the color the border is drawn.

      */

    public Color getBorderSelectionColor() {

        return borderSelectionColor;

    }

    /**

     * Subclassed to map <code>FontUIResource</code>s to null. If

     * <code>font</code> is null, or a <code>FontUIResource</code>, this

     * has the effect of letting the font of the JTree show

     * through. On the other hand, if <code>font</code> is non-null, and not

     * a <code>FontUIResource</code>, the font becomes <code>font</code>.

     */

    public void setFont(Font font) {

        if(font instanceof FontUIResource)

            font = null;

        super.setFont(font);

    }

    /**

     * Gets the font of this component.

     * @return this component's font; if a font has not been set

     * for this component, the font of its parent is returned

     */

    public Font getFont() {

        Font font = super.getFont();

        if (font == null && tree != null) {

            // Strive to return a non-null value, otherwise the html support

            // will typically pick up the wrong font in certain situations.

            font = tree.getFont();

        }

        return font;

    }

    /**

     * Subclassed to map <code>ColorUIResource</code>s to null. If

     * <code>color</code> is null, or a <code>ColorUIResource</code>, this

     * has the effect of letting the background color of the JTree show

     * through. On the other hand, if <code>color</code> is non-null, and not

     * a <code>ColorUIResource</code>, the background becomes

     * <code>color</code>.

     */

    public void setBackground(Color color) {

        if(color instanceof ColorUIResource)

            color = null;

        super.setBackground(color);

    }

    /**

      * Configures the renderer based on the passed in components.

      * The value is set from messaging the tree with

      * <code>convertValueToText</code>, which ultimately invokes

      * <code>toString</code> on <code>value</code>.

      * The foreground color is set based on the selection and the icon

      * is set based on the <code>leaf</code> and <code>expanded</code>

      * parameters.

      */

    public Component getTreeCellRendererComponent(JTree tree, Object value,

                                                  boolean sel,

                                                  boolean expanded,

                                                  boolean leaf, int row,

                                                  boolean hasFocus) {

        String         stringValue = tree.convertValueToText(value, sel,

                                          expanded, leaf, row, hasFocus);

        this.tree = tree;

        this.hasFocus = hasFocus;

        setText(stringValue);

        Color fg = null;

        isDropCell = false;

        JTree.DropLocation dropLocation = tree.getDropLocation();

        if (dropLocation != null

                && dropLocation.getChildIndex() == -1

                && tree.getRowForPath(dropLocation.getPath()) == row) {

            Color col = DefaultLookup.getColor(this, ui, "Tree.dropCellForeground");

            if (col != null) {

                fg = col;

            } else {

                fg = getTextSelectionColor();

            }

            isDropCell = true;

        } else if (sel) {

            fg = getTextSelectionColor();

        } else {

            fg = getTextNonSelectionColor();

        }

        setForeground(fg);

        Icon icon = null;

        if (leaf) {

            icon = getLeafIcon();

        } else if (expanded) {

            icon = getOpenIcon();

        } else {

            icon = getClosedIcon();

        }

        if (!tree.isEnabled()) {

            setEnabled(false);

            LookAndFeel laf = UIManager.getLookAndFeel();

            Icon disabledIcon = laf.getDisabledIcon(tree, icon);

            if (disabledIcon != null) icon = disabledIcon;

            setDisabledIcon(icon);

        } else {

            setEnabled(true);

            setIcon(icon);

        }

        setComponentOrientation(tree.getComponentOrientation());

        selected = sel;

        return this;

    }

    /**

      * Paints the value.  The background is filled based on selected.

      */

    public void paint(Graphics g) {

        Color bColor;

        if (isDropCell) {

            bColor = DefaultLookup.getColor(this, ui, "Tree.dropCellBackground");

            if (bColor == null) {

                bColor = getBackgroundSelectionColor();

            }

        } else if (selected) {

            bColor = getBackgroundSelectionColor();

        } else {

            bColor = getBackgroundNonSelectionColor();

            if (bColor == null) {

                bColor = getBackground();

            }

        }

        int imageOffset = -1;

        if (bColor != null && fillBackground) {

            imageOffset = getLabelStart();

            g.setColor(bColor);

            if(getComponentOrientation().isLeftToRight()) {

                g.fillRect(imageOffset, 0, getWidth() - imageOffset,

                           getHeight());

            } else {

                g.fillRect(0, 0, getWidth() - imageOffset,

                           getHeight());

            }

        }

        if (hasFocus) {

            if (drawsFocusBorderAroundIcon) {