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 * Copyright (c) 1997, 2015, 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
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 * 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
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 * accompanied this code).
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 *
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package javax.swing.border;

import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.Rectangle;
import java.awt.geom.Path2D;
import java.beans.ConstructorProperties;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.lang.ref.WeakReference;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.UIManager;
import javax.swing.plaf.basic.BasicHTML;

import jdk.internal.ref.CleanerFactory;

A class which implements an arbitrary border
with the addition of a String title in a
specified position and justification.

If the border, font, or color property values are not
specified in the constructor or by invoking the appropriate
set methods, the property values will be defined by the current
look and feel, using the following property names in the
Defaults Table:

"TitledBorder.border"
"TitledBorder.font"
"TitledBorder.titleColor"


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 XMLEncoder. 
Author:
David Kloba, Amy Fowler/**
 * A class which implements an arbitrary border
 * with the addition of a String title in a
 * specified position and justification.
 * <p>
 * If the border, font, or color property values are not
 * specified in the constructor or by invoking the appropriate
 * set methods, the property values will be defined by the current
 * look and feel, using the following property names in the
 * Defaults Table:
 * <ul>
 * <li>&quot;TitledBorder.border&quot;
 * <li>&quot;TitledBorder.font&quot;
 * <li>&quot;TitledBorder.titleColor&quot;
 * </ul>
 * <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 David Kloba
 * @author Amy Fowler
 */
@SuppressWarnings("serial")
public class TitledBorder extends AbstractBorder
{
    
The title the border should display.
/**
     * The title the border should display.
     */
    protected String title;
    
The border.
/**
     * The border.
     */
    protected Border border;
    
The position for the title.
/**
     * The position for the title.
     */
    protected int titlePosition;
    
The justification for the title.
/**
     * The justification for the title.
     */
    protected int titleJustification;
    
The font for rendering the title.
/**
     * The font for rendering the title.
     */
    protected Font titleFont;
    
The color of the title.
/**
     * The color of the title.
     */
    protected Color titleColor;

    private final JLabel label;

    
Use the default vertical orientation for the title text.
/**
     * Use the default vertical orientation for the title text.
     */
    public static final int     DEFAULT_POSITION        = 0;
    
Position the title above the border's top line. /** Position the title above the border's top line. */
    public static final int     ABOVE_TOP               = 1;
    
Position the title in the middle of the border's top line. /** Position the title in the middle of the border's top line. */
    public static final int     TOP                     = 2;
    
Position the title below the border's top line. /** Position the title below the border's top line. */
    public static final int     BELOW_TOP               = 3;
    
Position the title above the border's bottom line. /** Position the title above the border's bottom line. */
    public static final int     ABOVE_BOTTOM            = 4;
    
Position the title in the middle of the border's bottom line. /** Position the title in the middle of the border's bottom line. */
    public static final int     BOTTOM                  = 5;
    
Position the title below the border's bottom line. /** Position the title below the border's bottom line. */
    public static final int     BELOW_BOTTOM            = 6;

    
Use the default justification for the title text.
/**
     * Use the default justification for the title text.
     */
    public static final int     DEFAULT_JUSTIFICATION   = 0;
    
Position title text at the left side of the border line. /** Position title text at the left side of the border line. */
    public static final int     LEFT                    = 1;
    
Position title text in the center of the border line. /** Position title text in the center of the border line. */
    public static final int     CENTER                  = 2;
    
Position title text at the right side of the border line. /** Position title text at the right side of the border line. */
    public static final int     RIGHT                   = 3;
    
Position title text at the left side of the border line
 for left to right orientation, at the right side of the
 border line for right to left orientation.
/** Position title text at the left side of the border line
     *  for left to right orientation, at the right side of the
     *  border line for right to left orientation.
     */
    public static final int     LEADING = 4;
    
Position title text at the right side of the border line
 for left to right orientation, at the left side of the
 border line for right to left orientation.
/** Position title text at the right side of the border line
     *  for left to right orientation, at the left side of the
     *  border line for right to left orientation.
     */
    public static final int     TRAILING = 5;

    
Space between the border and the component's edge
/**
     * Space between the border and the component's edge
     */
    protected static final int EDGE_SPACING = 2;

    
Space between the border and text
/**
     * Space between the border and text
     */
    protected static final int TEXT_SPACING = 2;

    
Horizontal inset of text that is left or right justified
/**
     * Horizontal inset of text that is left or right justified
     */
    protected static final int TEXT_INSET_H = 5;

    
Creates a TitledBorder instance.
Params:
title –  the title the border should display/**
     * Creates a TitledBorder instance.
     *
     * @param title  the title the border should display
     */
    public TitledBorder(String title) {
        this(null, title, LEADING, DEFAULT_POSITION, null, null);
    }

    
Creates a TitledBorder instance with the specified border
and an empty title.
Params:
border –  the border/**
     * Creates a TitledBorder instance with the specified border
     * and an empty title.
     *
     * @param border  the border
     */
    public TitledBorder(Border border) {
        this(border, "", LEADING, DEFAULT_POSITION, null, null);
    }

    
Creates a TitledBorder instance with the specified border
and title.
Params:
border –  the border
title –  the title the border should display/**
     * Creates a TitledBorder instance with the specified border
     * and title.
     *
     * @param border  the border
     * @param title  the title the border should display
     */
    public TitledBorder(Border border, String title) {
        this(border, title, LEADING, DEFAULT_POSITION, null, null);
    }

    
Creates a TitledBorder instance with the specified border,
title, title-justification, and title-position.
Params:
border –  the border
title –  the title the border should display
titleJustification – the justification for the title
titlePosition – the position for the title/**
     * Creates a TitledBorder instance with the specified border,
     * title, title-justification, and title-position.
     *
     * @param border  the border
     * @param title  the title the border should display
     * @param titleJustification the justification for the title
     * @param titlePosition the position for the title
     */
    public TitledBorder(Border border,
                        String title,
                        int titleJustification,
                        int titlePosition) {
        this(border, title, titleJustification,
             titlePosition, null, null);
    }

    
Creates a TitledBorder instance with the specified border,
title, title-justification, title-position, and title-font.
Params:
border –  the border
title –  the title the border should display
titleJustification – the justification for the title
titlePosition – the position for the title
titleFont – the font for rendering the title/**
     * Creates a TitledBorder instance with the specified border,
     * title, title-justification, title-position, and title-font.
     *
     * @param border  the border
     * @param title  the title the border should display
     * @param titleJustification the justification for the title
     * @param titlePosition the position for the title
     * @param titleFont the font for rendering the title
     */
    public TitledBorder(Border border,
                        String title,
                        int titleJustification,
                        int titlePosition,
                        Font titleFont) {
        this(border, title, titleJustification,
             titlePosition, titleFont, null);
    }

    
Creates a TitledBorder instance with the specified border,
title, title-justification, title-position, title-font, and
title-color.
Params:
border –  the border
title –  the title the border should display
titleJustification – the justification for the title
titlePosition – the position for the title
titleFont – the font of the title
titleColor – the color of the title/**
     * Creates a TitledBorder instance with the specified border,
     * title, title-justification, title-position, title-font, and
     * title-color.
     *
     * @param border  the border
     * @param title  the title the border should display
     * @param titleJustification the justification for the title
     * @param titlePosition the position for the title
     * @param titleFont the font of the title
     * @param titleColor the color of the title
     */
    @ConstructorProperties({"border", "title", "titleJustification", "titlePosition", "titleFont", "titleColor"})
    public TitledBorder(Border border,
                        String title,
                        int titleJustification,
                        int titlePosition,
                        Font titleFont,
                        Color titleColor) {
        this.title = title;
        this.border = border;
        this.titleFont = titleFont;
        this.titleColor = titleColor;

        setTitleJustification(titleJustification);
        setTitlePosition(titlePosition);

        this.label = new JLabel();
        this.label.setOpaque(false);
        this.label.putClientProperty(BasicHTML.propertyKey, null);
        installPropertyChangeListeners();
    }

    
Paints the border for the specified component with the
specified position and size.
Params:
c – the component for which this border is being painted
g – the paint graphics
x – the x position of the painted border
y – the y position of the painted border
width – the width of the painted border
height – the height of the painted border/**
     * Paints the border for the specified component with the
     * specified position and size.
     * @param c the component for which this border is being painted
     * @param g the paint graphics
     * @param x the x position of the painted border
     * @param y the y position of the painted border
     * @param width the width of the painted border
     * @param height the height of the painted border
     */
    public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
        Border border = getBorder();
        String title = getTitle();
        if ((title != null) && !title.isEmpty()) {
            int edge = (border instanceof TitledBorder) ? 0 : EDGE_SPACING;
            JLabel label = getLabel(c);
            Dimension size = label.getPreferredSize();
            Insets insets = getBorderInsets(border, c, new Insets(0, 0, 0, 0));

            int borderX = x + edge;
            int borderY = y + edge;
            int borderW = width - edge - edge;
            int borderH = height - edge - edge;

            int labelY = y;
            int labelH = size.height;
            int position = getPosition();
            switch (position) {
                case ABOVE_TOP:
                    insets.left = 0;
                    insets.right = 0;
                    borderY += labelH - edge;
                    borderH -= labelH - edge;
                    break;
                case TOP:
                    insets.top = edge + insets.top/2 - labelH/2;
                    if (insets.top < edge) {
                        borderY -= insets.top;
                        borderH += insets.top;
                    }
                    else {
                        labelY += insets.top;
                    }
                    break;
                case BELOW_TOP:
                    labelY += insets.top + edge;
                    break;
                case ABOVE_BOTTOM:
                    labelY += height - labelH - insets.bottom - edge;
                    break;
                case BOTTOM:
                    labelY += height - labelH;
                    insets.bottom = edge + (insets.bottom - labelH) / 2;
                    if (insets.bottom < edge) {
                        borderH += insets.bottom;
                    }
                    else {
                        labelY -= insets.bottom;
                    }
                    break;
                case BELOW_BOTTOM:
                    insets.left = 0;
                    insets.right = 0;
                    labelY += height - labelH;
                    borderH -= labelH - edge;
                    break;
            }
            insets.left += edge + TEXT_INSET_H;
            insets.right += edge + TEXT_INSET_H;

            int labelX = x;
            int labelW = width - insets.left - insets.right;
            if (labelW > size.width) {
                labelW = size.width;
            }
            switch (getJustification(c)) {
                case LEFT:
                    labelX += insets.left;
                    break;
                case RIGHT:
                    labelX += width - insets.right - labelW;
                    break;
                case CENTER:
                    labelX += (width - labelW) / 2;
                    break;
            }

            if (border != null) {
                if ((position != TOP) && (position != BOTTOM)) {
                    border.paintBorder(c, g, borderX, borderY, borderW, borderH);
                }
                else {
                    Graphics g2 = g.create();
                    if (g2 instanceof Graphics2D) {
                        Graphics2D g2d = (Graphics2D) g2;
                        Path2D path = new Path2D.Float();
                        path.append(new Rectangle(borderX, borderY, borderW, labelY - borderY), false);
                        path.append(new Rectangle(borderX, labelY, labelX - borderX - TEXT_SPACING, labelH), false);
                        path.append(new Rectangle(labelX + labelW + TEXT_SPACING, labelY, borderX - labelX + borderW - labelW - TEXT_SPACING, labelH), false);
                        path.append(new Rectangle(borderX, labelY + labelH, borderW, borderY - labelY + borderH - labelH), false);
                        g2d.clip(path);
                    }
                    border.paintBorder(c, g2, borderX, borderY, borderW, borderH);
                    g2.dispose();
                }
            }
            g.translate(labelX, labelY);
            label.setSize(labelW, labelH);
            label.paint(g);
            g.translate(-labelX, -labelY);
        }
        else if (border != null) {
            border.paintBorder(c, g, x, y, width, height);
        }
    }

    
Reinitialize the insets parameter with this Border's current Insets.
Params:
c – the component for which this border insets value applies
insets – the object to be reinitialized/**
     * Reinitialize the insets parameter with this Border's current Insets.
     * @param c the component for which this border insets value applies
     * @param insets the object to be reinitialized
     */
    public Insets getBorderInsets(Component c, Insets insets) {
        Border border = getBorder();
        insets = getBorderInsets(border, c, insets);

        String title = getTitle();
        if ((title != null) && !title.isEmpty()) {
            int edge = (border instanceof TitledBorder) ? 0 : EDGE_SPACING;
            JLabel label = getLabel(c);
            Dimension size = label.getPreferredSize();

            switch (getPosition()) {
                case ABOVE_TOP:
                    insets.top += size.height - edge;
                    break;
                case TOP: {
                    if (insets.top < size.height) {
                        insets.top = size.height - edge;
                    }
                    break;
                }
                case BELOW_TOP:
                    insets.top += size.height;
                    break;
                case ABOVE_BOTTOM:
                    insets.bottom += size.height;
                    break;
                case BOTTOM: {
                    if (insets.bottom < size.height) {
                        insets.bottom = size.height - edge;
                    }
                    break;
                }
                case BELOW_BOTTOM:
                    insets.bottom += size.height - edge;
                    break;
            }
            insets.top += edge + TEXT_SPACING;
            insets.left += edge + TEXT_SPACING;
            insets.right += edge + TEXT_SPACING;
            insets.bottom += edge + TEXT_SPACING;
        }
        return insets;
    }

    
Returns whether or not the border is opaque.
/**
     * Returns whether or not the border is opaque.
     */
    public boolean isBorderOpaque() {
        return false;
    }

    
Returns the title of the titled border.
Returns:
the title of the titled border/**
     * Returns the title of the titled border.
     *
     * @return the title of the titled border
     */
    public String getTitle() {
        return title;
    }

    
Returns the border of the titled border.
Returns:
the border of the titled border/**
     * Returns the border of the titled border.
     *
     * @return the border of the titled border
     */
    public Border getBorder() {
        return border != null
                ? border
                : UIManager.getBorder("TitledBorder.border");
    }

    
Returns the title-position of the titled border.
Returns:
the title-position of the titled border/**
     * Returns the title-position of the titled border.
     *
     * @return the title-position of the titled border
     */
    public int getTitlePosition() {
        return titlePosition;
    }

    
Returns the title-justification of the titled border.
Returns:
the title-justification of the titled border/**
     * Returns the title-justification of the titled border.
     *
     * @return the title-justification of the titled border
     */
    public int getTitleJustification() {
        return titleJustification;
    }

    
Returns the title-font of the titled border.
Returns:
the title-font of the titled border/**
     * Returns the title-font of the titled border.
     *
     * @return the title-font of the titled border
     */
    public Font getTitleFont() {
        return titleFont == null ? UIManager.getFont("TitledBorder.font") : titleFont;
    }

    
Returns the title-color of the titled border.
Returns:
the title-color of the titled border/**
     * Returns the title-color of the titled border.
     *
     * @return the title-color of the titled border
     */
    public Color getTitleColor() {
        return titleColor == null ? UIManager.getColor("TitledBorder.titleColor") : titleColor;
    }


    // REMIND(aim): remove all or some of these set methods?

    
Sets the title of the titled border.
Params:
title –  the title for the border/**
     * Sets the title of the titled border.
     * @param title  the title for the border
     */
    public void setTitle(String title) {
        this.title = title;
    }

    
Sets the border of the titled border.
Params:
border – the border/**
     * Sets the border of the titled border.
     * @param border the border
     */
    public void setBorder(Border border) {
        this.border = border;
    }

    
Sets the title-position of the titled border.
Params:
titlePosition – the position for the border/**
     * Sets the title-position of the titled border.
     * @param titlePosition the position for the border
     */
    public void setTitlePosition(int titlePosition) {
        switch (titlePosition) {
            case ABOVE_TOP:
            case TOP:
            case BELOW_TOP:
            case ABOVE_BOTTOM:
            case BOTTOM:
            case BELOW_BOTTOM:
            case DEFAULT_POSITION:
                this.titlePosition = titlePosition;
                break;
            default:
                throw new IllegalArgumentException(titlePosition +
                        " is not a valid title position.");
        }
    }

    
Sets the title-justification of the titled border.
Params:
titleJustification – the justification for the border/**
     * Sets the title-justification of the titled border.
     * @param titleJustification the justification for the border
     */
    public void setTitleJustification(int titleJustification) {
        switch (titleJustification) {
            case DEFAULT_JUSTIFICATION:
            case LEFT:
            case CENTER:
            case RIGHT:
            case LEADING:
            case TRAILING:
                this.titleJustification = titleJustification;
                break;
            default:
                throw new IllegalArgumentException(titleJustification +
                        " is not a valid title justification.");
        }
    }

    
Sets the title-font of the titled border.
Params:
titleFont – the font for the border title/**
     * Sets the title-font of the titled border.
     * @param titleFont the font for the border title
     */
    public void setTitleFont(Font titleFont) {
        this.titleFont = titleFont;
    }

    
Sets the title-color of the titled border.
Params:
titleColor – the color for the border title/**
     * Sets the title-color of the titled border.
     * @param titleColor the color for the border title
     */
    public void setTitleColor(Color titleColor) {
        this.titleColor = titleColor;
    }

    
Returns the minimum dimensions this border requires
in order to fully display the border and title.
Params:
c – the component where this border will be drawn
Returns:
the Dimension object/**
     * Returns the minimum dimensions this border requires
     * in order to fully display the border and title.
     * @param c the component where this border will be drawn
     * @return the {@code Dimension} object
     */
    public Dimension getMinimumSize(Component c) {
        Insets insets = getBorderInsets(c);
        Dimension minSize = new Dimension(insets.right+insets.left,
                                          insets.top+insets.bottom);
        String title = getTitle();
        if ((title != null) && !title.isEmpty()) {
            JLabel label = getLabel(c);
            Dimension size = label.getPreferredSize();

            int position = getPosition();
            if ((position != ABOVE_TOP) && (position != BELOW_BOTTOM)) {
                minSize.width += size.width;
            }
            else if (minSize.width < size.width) {
                minSize.width += size.width;
            }
        }
        return minSize;
    }

    
Returns the baseline.
Throws:
NullPointerException – {@inheritDoc}
IllegalArgumentException – {@inheritDoc}
See Also:
JComponent.getBaseline(int, int)
Since:
1.6/**
     * Returns the baseline.
     *
     * @throws NullPointerException {@inheritDoc}
     * @throws IllegalArgumentException {@inheritDoc}
     * @see javax.swing.JComponent#getBaseline(int, int)
     * @since 1.6
     */
    public int getBaseline(Component c, int width, int height) {
        if (c == null) {
            throw new NullPointerException("Must supply non-null component");
        }
        if (width < 0) {
            throw new IllegalArgumentException("Width must be >= 0");
        }
        if (height < 0) {
            throw new IllegalArgumentException("Height must be >= 0");
        }
        Border border = getBorder();
        String title = getTitle();
        if ((title != null) && !title.isEmpty()) {
            int edge = (border instanceof TitledBorder) ? 0 : EDGE_SPACING;
            JLabel label = getLabel(c);
            Dimension size = label.getPreferredSize();
            Insets insets = getBorderInsets(border, c, new Insets(0, 0, 0, 0));

            int baseline = label.getBaseline(size.width, size.height);
            switch (getPosition()) {
                case ABOVE_TOP:
                    return baseline;
                case TOP:
                    insets.top = edge + (insets.top - size.height) / 2;
                    return (insets.top < edge)
                            ? baseline
                            : baseline + insets.top;
                case BELOW_TOP:
                    return baseline + insets.top + edge;
                case ABOVE_BOTTOM:
                    return baseline + height - size.height - insets.bottom - edge;
                case BOTTOM:
                    insets.bottom = edge + (insets.bottom - size.height) / 2;
                    return (insets.bottom < edge)
                            ? baseline + height - size.height
                            : baseline + height - size.height + insets.bottom;
                case BELOW_BOTTOM:
                    return baseline + height - size.height;
            }
        }
        return -1;
    }

    
Returns an enum indicating how the baseline of the border
changes as the size changes.
Throws:
NullPointerException – {@inheritDoc}
See Also:
JComponent.getBaseline(int, int)
Since:
1.6/**
     * Returns an enum indicating how the baseline of the border
     * changes as the size changes.
     *
     * @throws NullPointerException {@inheritDoc}
     * @see javax.swing.JComponent#getBaseline(int, int)
     * @since 1.6
     */
    public Component.BaselineResizeBehavior getBaselineResizeBehavior(
            Component c) {
        super.getBaselineResizeBehavior(c);
        switch (getPosition()) {
            case TitledBorder.ABOVE_TOP:
            case TitledBorder.TOP:
            case TitledBorder.BELOW_TOP:
                return Component.BaselineResizeBehavior.CONSTANT_ASCENT;
            case TitledBorder.ABOVE_BOTTOM:
            case TitledBorder.BOTTOM:
            case TitledBorder.BELOW_BOTTOM:
                return JComponent.BaselineResizeBehavior.CONSTANT_DESCENT;
        }
        return Component.BaselineResizeBehavior.OTHER;
    }

    private int getPosition() {
        int position = getTitlePosition();
        if (position != DEFAULT_POSITION) {
            return position;
        }
        Object value = UIManager.get("TitledBorder.position");
        if (value instanceof Integer) {
            int i = (Integer) value;
            if ((0 < i) && (i <= 6)) {
                return i;
            }
        }
        else if (value instanceof String) {
            String s = (String) value;
            if (s.equalsIgnoreCase("ABOVE_TOP")) {
                return ABOVE_TOP;
            }
            if (s.equalsIgnoreCase("TOP")) {
                return TOP;
            }
            if (s.equalsIgnoreCase("BELOW_TOP")) {
                return BELOW_TOP;
            }
            if (s.equalsIgnoreCase("ABOVE_BOTTOM")) {
                return ABOVE_BOTTOM;
            }
            if (s.equalsIgnoreCase("BOTTOM")) {
                return BOTTOM;
            }
            if (s.equalsIgnoreCase("BELOW_BOTTOM")) {
                return BELOW_BOTTOM;
            }
        }
        return TOP;
    }

    private int getJustification(Component c) {
        int justification = getTitleJustification();
        if ((justification == LEADING) || (justification == DEFAULT_JUSTIFICATION)) {
            return c.getComponentOrientation().isLeftToRight() ? LEFT : RIGHT;
        }
        if (justification == TRAILING) {
            return c.getComponentOrientation().isLeftToRight() ? RIGHT : LEFT;
        }
        return justification;
    }

    
Returns default font of the titled border.
Params:
c – the component
Returns:
default font of the titled border/**
     * Returns default font of the titled border.
     * @return default font of the titled border
     * @param c the component
     */
    protected Font getFont(Component c) {
        Font font = getTitleFont();
        if (font != null) {
            return font;
        }
        if (c != null) {
            font = c.getFont();
            if (font != null) {
                return font;
            }
        }
        return new Font(Font.DIALOG, Font.PLAIN, 12);
    }

    private Color getColor(Component c) {
        Color color = getTitleColor();
        if (color != null) {
            return color;
        }
        return (c != null)
                ? c.getForeground()
                : null;
    }

    private JLabel getLabel(Component c) {
        this.label.setText(getTitle());
        this.label.setFont(getFont(c));
        this.label.setForeground(getColor(c));
        this.label.setComponentOrientation(c.getComponentOrientation());
        this.label.setEnabled(c.isEnabled());
        return this.label;
    }

    private static Insets getBorderInsets(Border border, Component c, Insets insets) {
        if (border == null) {
            insets.set(0, 0, 0, 0);
        }
        else if (border instanceof AbstractBorder) {
            AbstractBorder ab = (AbstractBorder) border;
            insets = ab.getBorderInsets(c, insets);
        }
        else {
            Insets i = border.getBorderInsets(c);
            insets.set(i.top, i.left, i.bottom, i.right);
        }
        return insets;
    }

    private void installPropertyChangeListeners() {
        final WeakReference<TitledBorder> weakReference = new WeakReference<TitledBorder>(this);
        final PropertyChangeListener listener = evt -> {
            TitledBorder tb = weakReference.get();
            String prop = evt.getPropertyName();
            if (tb != null && ("lookAndFeel".equals(prop) || "LabelUI".equals(prop))) {
                tb.label.updateUI();
            }
        };

        UIManager.addPropertyChangeListener(listener);
        UIManager.getDefaults().addPropertyChangeListener(listener);
        CleanerFactory.cleaner().register(this, () -> {
            UIManager.removePropertyChangeListener(listener);
            UIManager.getDefaults().removePropertyChangeListener(listener);
        });
    }
}