GridBagLayout.java

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package java.awt;

import java.util.Hashtable;
import java.util.Arrays;

/**
 * The {@code GridBagLayout} class is a flexible layout
 * manager that aligns components vertically, horizontally or along their
 * baseline without requiring that the components be of the same size.
 * Each {@code GridBagLayout} object maintains a dynamic,
 * rectangular grid of cells, with each component occupying
 * one or more cells, called its <em>display area</em>.
 * <p>
 * Each component managed by a {@code GridBagLayout} is associated with
 * an instance of {@link GridBagConstraints}.  The constraints object
 * specifies where a component's display area should be located on the grid
 * and how the component should be positioned within its display area.  In
 * addition to its constraints object, the {@code GridBagLayout} also
 * considers each component's minimum and preferred sizes in order to
 * determine a component's size.
 * <p>
 * The overall orientation of the grid depends on the container's
 * {@link ComponentOrientation} property.  For horizontal left-to-right
 * orientations, grid coordinate (0,0) is in the upper left corner of the
 * container with x increasing to the right and y increasing downward.  For
 * horizontal right-to-left orientations, grid coordinate (0,0) is in the upper
 * right corner of the container with x increasing to the left and y
 * increasing downward.
 * <p>
 * To use a grid bag layout effectively, you must customize one or more
 * of the {@code GridBagConstraints} objects that are associated
 * with its components. You customize a {@code GridBagConstraints}
 * object by setting one or more of its instance variables:
 *
 * <dl>
 * <dt>{@link GridBagConstraints#gridx},
 * {@link GridBagConstraints#gridy}
 * <dd>Specifies the cell containing the leading corner of the component's
 * display area, where the cell at the origin of the grid has address
 * <code>gridx&nbsp;=&nbsp;0</code>,
 * <code>gridy&nbsp;=&nbsp;0</code>.  For horizontal left-to-right layout,
 * a component's leading corner is its upper left.  For horizontal
 * right-to-left layout, a component's leading corner is its upper right.
 * Use {@code GridBagConstraints.RELATIVE} (the default value)
 * to specify that the component be placed immediately following
 * (along the x axis for {@code gridx} or the y axis for
 * {@code gridy}) the component that was added to the container
 * just before this component was added.
 * <dt>{@link GridBagConstraints#gridwidth},
 * {@link GridBagConstraints#gridheight}
 * <dd>Specifies the number of cells in a row (for {@code gridwidth})
 * or column (for {@code gridheight})
 * in the component's display area.
 * The default value is 1.
 * Use {@code GridBagConstraints.REMAINDER} to specify
 * that the component's display area will be from {@code gridx}
 * to the last cell in the row (for {@code gridwidth})
 * or from {@code gridy} to the last cell in the column
 * (for {@code gridheight}).
 *
 * Use {@code GridBagConstraints.RELATIVE} to specify
 * that the component's display area will be from {@code gridx}
 * to the next to the last cell in its row (for {@code gridwidth})
 * or from {@code gridy} to the next to the last cell in its
 * column (for {@code gridheight}).
 *
 * <dt>{@link GridBagConstraints#fill}
 * <dd>Used when the component's display area
 * is larger than the component's requested size
 * to determine whether (and how) to resize the component.
 * Possible values are
 * {@code GridBagConstraints.NONE} (the default),
 * {@code GridBagConstraints.HORIZONTAL}
 * (make the component wide enough to fill its display area
 * horizontally, but don't change its height),
 * {@code GridBagConstraints.VERTICAL}
 * (make the component tall enough to fill its display area
 * vertically, but don't change its width), and
 * {@code GridBagConstraints.BOTH}
 * (make the component fill its display area entirely).
 * <dt>{@link GridBagConstraints#ipadx},
 * {@link GridBagConstraints#ipady}
 * <dd>Specifies the component's internal padding within the layout,
 * how much to add to the minimum size of the component.
 * The width of the component will be at least its minimum width
 * plus {@code ipadx} pixels. Similarly, the height of
 * the component will be at least the minimum height plus
 * {@code ipady} pixels.
 * <dt>{@link GridBagConstraints#insets}
 * <dd>Specifies the component's external padding, the minimum
 * amount of space between the component and the edges of its display area.
 * <dt>{@link GridBagConstraints#anchor}
 * <dd>Specifies where the component should be positioned in its display area.
 * There are three kinds of possible values: absolute, orientation-relative,
 * and baseline-relative.
 * Orientation relative values are interpreted relative to the container's
 * {@code ComponentOrientation} property while absolute values
 * are not.  Baseline relative values are calculated relative to the
 * baseline.  Valid values are:
 *
 * <ul>
 *   <li>Absolute Values:
 *     <ul>
 *       <li>{@code GridBagConstraints.NORTH}
 *       <li>{@code GridBagConstraints.SOUTH}
 *       <li>{@code GridBagConstraints.WEST}
 *       <li>{@code GridBagConstraints.EAST}
 *       <li>{@code GridBagConstraints.NORTHWEST}
 *       <li>{@code GridBagConstraints.NORTHEAST}
 *       <li>{@code GridBagConstraints.SOUTHWEST}
 *       <li>{@code GridBagConstraints.SOUTHEAST}
 *       <li>{@code GridBagConstraints.CENTER} (the default)
 *     </ul>
 *   <li>Orientation Relative Values:
 *     <ul >
 *       <li>{@code GridBagConstraints.PAGE_START}
 *       <li>{@code GridBagConstraints.PAGE_END}
 *       <li>{@code GridBagConstraints.LINE_START}
 *       <li>{@code GridBagConstraints.LINE_END}
 *       <li>{@code GridBagConstraints.FIRST_LINE_START}
 *       <li>{@code GridBagConstraints.FIRST_LINE_END}
 *       <li>{@code GridBagConstraints.LAST_LINE_START}
 *       <li>{@code GridBagConstraints.LAST_LINE_END}
 *     </ul>
 *   <li>Baseline Relative Values:
 *     <ul>
 *       <li>{@code GridBagConstraints.BASELINE}
 *       <li>{@code GridBagConstraints.BASELINE_LEADING}
 *       <li>{@code GridBagConstraints.BASELINE_TRAILING}
 *       <li>{@code GridBagConstraints.ABOVE_BASELINE}
 *       <li>{@code GridBagConstraints.ABOVE_BASELINE_LEADING}
 *       <li>{@code GridBagConstraints.ABOVE_BASELINE_TRAILING}
 *       <li>{@code GridBagConstraints.BELOW_BASELINE}
 *       <li>{@code GridBagConstraints.BELOW_BASELINE_LEADING}
 *       <li>{@code GridBagConstraints.BELOW_BASELINE_TRAILING}
 *     </ul>
 * </ul>
 * <dt>{@link GridBagConstraints#weightx},
 * {@link GridBagConstraints#weighty}
 * <dd>Used to determine how to distribute space, which is
 * important for specifying resizing behavior.
 * Unless you specify a weight for at least one component
 * in a row ({@code weightx}) and column ({@code weighty}),
 * all the components clump together in the center of their container.
 * This is because when the weight is zero (the default),
 * the {@code GridBagLayout} object puts any extra space
 * between its grid of cells and the edges of the container.
 * </dl>
 * <p>
 * Each row may have a baseline; the baseline is determined by the
 * components in that row that have a valid baseline and are aligned
 * along the baseline (the component's anchor value is one of {@code
 * BASELINE}, {@code BASELINE_LEADING} or {@code BASELINE_TRAILING}).
 * If none of the components in the row has a valid baseline, the row
 * does not have a baseline.
 * <p>
 * If a component spans rows it is aligned either to the baseline of
 * the start row (if the baseline-resize behavior is {@code
 * CONSTANT_ASCENT}) or the end row (if the baseline-resize behavior
 * is {@code CONSTANT_DESCENT}).  The row that the component is
 * aligned to is called the <em>prevailing row</em>.
 * <p>
 * The following figure shows a baseline layout and includes a
 * component that spans rows:
 * <p style="text-align: center">
 *   <img src="doc-files/GridBagLayout-baseline.png"
 *   alt="The following text describes this graphic (Figure 1).">
 * </p>
 * This layout consists of three components:
 * <ul><li>A panel that starts in row 0 and ends in row 1.  The panel
 *   has a baseline-resize behavior of {@code CONSTANT_DESCENT} and has
 *   an anchor of {@code BASELINE}.  As the baseline-resize behavior
 *   is {@code CONSTANT_DESCENT} the prevailing row for the panel is
 *   row 1.
 * <li>Two buttons, each with a baseline-resize behavior of
 *   {@code CENTER_OFFSET} and an anchor of {@code BASELINE}.
 * </ul>
 * Because the second button and the panel share the same prevailing row,
 * they are both aligned along their baseline.
 * <p>
 * Components positioned using one of the baseline-relative values resize
 * differently than when positioned using an absolute or orientation-relative
 * value.  How components change is dictated by how the baseline of the
 * prevailing row changes.  The baseline is anchored to the
 * bottom of the display area if any components with the same prevailing row
 * have a baseline-resize behavior of {@code CONSTANT_DESCENT},
 * otherwise the baseline is anchored to the top of the display area.
 * The following rules dictate the resize behavior:
 * <ul>
 * <li>Resizable components positioned above the baseline can only
 * grow as tall as the baseline.  For example, if the baseline is at 100
 * and anchored at the top, a resizable component positioned above the
 * baseline can never grow more than 100 units.
 * <li>Similarly, resizable components positioned below the baseline can
 * only grow as high as the difference between the display height and the
 * baseline.
 * <li>Resizable components positioned on the baseline with a
 * baseline-resize behavior of {@code OTHER} are only resized if
 * the baseline at the resized size fits within the display area.  If
 * the baseline is such that it does not fit within the display area
 * the component is not resized.
 * <li>Components positioned on the baseline that do not have a
 * baseline-resize behavior of {@code OTHER}
 * can only grow as tall as {@code display height - baseline + baseline of component}.
 * </ul>
 * If you position a component along the baseline, but the
 * component does not have a valid baseline, it will be vertically centered
 * in its space.  Similarly if you have positioned a component relative
 * to the baseline and none of the components in the row have a valid
 * baseline the component is vertically centered.
 * <p>
 * The following figures show ten components (all buttons)
 * managed by a grid bag layout.  Figure 2 shows the layout for a horizontal,
 * left-to-right container and Figure 3 shows the layout for a horizontal,
 * right-to-left container.
 *
 * <div style="margin:0 auto;width:680px;text-align:center;font-weight:bold">
 *   <div style="float:left">
 *     <p><img src="doc-files/GridBagLayout-1.gif"
 *        alt="The preceding text describes this graphic (Figure 2)."
 *        style="margin: 7px 10px;">
 *     <p>Figure 2: Horizontal, Left-to-Right
 *   </div>
 *   <div style="float:right">
 *     <p><img src="doc-files/GridBagLayout-2.gif"
 *        alt="The preceding text describes this graphic (Figure 3)."
 *        style="margin: 7px 10px;">
 *     <p>Figure 3: Horizontal, Right-to-Left
 *   </div>
 *   <br style="clear:both;">
 * </div>
 * <p>
 * Each of the ten components has the {@code fill} field
 * of its associated {@code GridBagConstraints} object
 * set to {@code GridBagConstraints.BOTH}.
 * In addition, the components have the following non-default constraints:
 *
 * <ul>
 * <li>Button1, Button2, Button3: <code>weightx&nbsp;=&nbsp;1.0</code>
 * <li>Button4: <code>weightx&nbsp;=&nbsp;1.0</code>,
 * <code>gridwidth&nbsp;=&nbsp;GridBagConstraints.REMAINDER</code>
 * <li>Button5: <code>gridwidth&nbsp;=&nbsp;GridBagConstraints.REMAINDER</code>
 * <li>Button6: <code>gridwidth&nbsp;=&nbsp;GridBagConstraints.RELATIVE</code>
 * <li>Button7: <code>gridwidth&nbsp;=&nbsp;GridBagConstraints.REMAINDER</code>
 * <li>Button8: <code>gridheight&nbsp;=&nbsp;2</code>,
 * <code>weighty&nbsp;=&nbsp;1.0</code>
 * <li>Button9, Button 10:
 * <code>gridwidth&nbsp;=&nbsp;GridBagConstraints.REMAINDER</code>
 * </ul>
 * <p>
 * Here is the code that implements the example shown above:
 *
 * <hr><blockquote><pre>
 * import java.awt.*;
 * import java.util.*;
 * import java.applet.Applet;
 *
 * public class GridBagEx1 extends Applet {
 *
 *     protected void makebutton(String name,
 *                               GridBagLayout gridbag,
 *                               GridBagConstraints c) {
 *         Button button = new Button(name);
 *         gridbag.setConstraints(button, c);
 *         add(button);
 *     }
 *
 *     public void init() {
 *         GridBagLayout gridbag = new GridBagLayout();
 *         GridBagConstraints c = new GridBagConstraints();
 *
 *         setFont(new Font("SansSerif", Font.PLAIN, 14));
 *         setLayout(gridbag);
 *
 *         c.fill = GridBagConstraints.BOTH;
 *         c.weightx = 1.0;
 *         makebutton("Button1", gridbag, c);
 *         makebutton("Button2", gridbag, c);
 *         makebutton("Button3", gridbag, c);
 *
 *         c.gridwidth = GridBagConstraints.REMAINDER; //end row
 *         makebutton("Button4", gridbag, c);
 *
 *         c.weightx = 0.0;                //reset to the default
 *         makebutton("Button5", gridbag, c); //another row
 *
 *         c.gridwidth = GridBagConstraints.RELATIVE; //next-to-last in row
 *         makebutton("Button6", gridbag, c);
 *
 *         c.gridwidth = GridBagConstraints.REMAINDER; //end row
 *         makebutton("Button7", gridbag, c);
 *
 *         c.gridwidth = 1;                //reset to the default
 *         c.gridheight = 2;
 *         c.weighty = 1.0;
 *         makebutton("Button8", gridbag, c);
 *
 *         c.weighty = 0.0;                //reset to the default
 *         c.gridwidth = GridBagConstraints.REMAINDER; //end row
 *         c.gridheight = 1;               //reset to the default
 *         makebutton("Button9", gridbag, c);
 *         makebutton("Button10", gridbag, c);
 *
 *         setSize(300, 100);
 *     }
 *
 *     public static void main(String args[]) {
 *         Frame f = new Frame("GridBag Layout Example");
 *         GridBagEx1 ex1 = new GridBagEx1();
 *
 *         ex1.init();
 *
 *         f.add("Center", ex1);
 *         f.pack();
 *         f.setSize(f.getPreferredSize());
 *         f.show();
 *     }
 * }
 * </pre></blockquote><hr>
 *
 * @author Doug Stein
 * @author Bill Spitzak (orignial NeWS &amp; OLIT implementation)
 * @see       java.awt.GridBagConstraints
 * @see       java.awt.GridBagLayoutInfo
 * @see       java.awt.ComponentOrientation
 * @since 1.0
 */
public class GridBagLayout implements LayoutManager2,
java.io.Serializable {

    static final int EMPIRICMULTIPLIER = 2;
    /**
     * This field is no longer used to reserve arrays and kept for backward
     * compatibility. Previously, this was
     * the maximum number of grid positions (both horizontal and
     * vertical) that could be laid out by the grid bag layout.
     * Current implementation doesn't impose any limits
     * on the size of a grid.
     */
    protected static final int MAXGRIDSIZE = 512;

    /**
     * The smallest grid that can be laid out by the grid bag layout.
     */
    protected static final int MINSIZE = 1;
    /**
     * The preferred grid size that can be laid out by the grid bag layout.
     */
    protected static final int PREFERREDSIZE = 2;

    /**
     * This hashtable maintains the association between
     * a component and its gridbag constraints.
     * The Keys in {@code comptable} are the components and the
     * values are the instances of {@code GridBagConstraints}.
     *
     * @serial
     * @see java.awt.GridBagConstraints
     */
    protected Hashtable<Component,GridBagConstraints> comptable;

    /**
     * This field holds a gridbag constraints instance
     * containing the default values, so if a component
     * does not have gridbag constraints associated with
     * it, then the component will be assigned a
     * copy of the {@code defaultConstraints}.
     *
     * @serial
     * @see #getConstraints(Component)
     * @see #setConstraints(Component, GridBagConstraints)
     * @see #lookupConstraints(Component)
     */
    protected GridBagConstraints defaultConstraints;

    /**
     * This field holds the layout information
     * for the gridbag.  The information in this field
     * is based on the most recent validation of the
     * gridbag.
     * If {@code layoutInfo} is {@code null}
     * this indicates that there are no components in
     * the gridbag or if there are components, they have
     * not yet been validated.
     *
     * @serial
     * @see #getLayoutInfo(Container, int)
     */
    protected GridBagLayoutInfo layoutInfo;

    /**
     * This field holds the overrides to the column minimum
     * width.  If this field is non-{@code null} the values are
     * applied to the gridbag after all of the minimum columns
     * widths have been calculated.
     * If columnWidths has more elements than the number of
     * columns, columns are added to the gridbag to match
     * the number of elements in columnWidth.
     *
     * @serial
     * @see #getLayoutDimensions()
     */
    public int[] columnWidths;

    /**
     * This field holds the overrides to the row minimum
     * heights.  If this field is non-{@code null} the values are
     * applied to the gridbag after all of the minimum row
     * heights have been calculated.
     * If {@code rowHeights} has more elements than the number of
     * rows, rows are added to the gridbag to match
     * the number of elements in {@code rowHeights}.
     *
     * @serial
     * @see #getLayoutDimensions()
     */
    public int[] rowHeights;

    /**
     * This field holds the overrides to the column weights.
     * If this field is non-{@code null} the values are
     * applied to the gridbag after all of the columns
     * weights have been calculated.
     * If {@code columnWeights[i] >} weight for column i, then
     * column i is assigned the weight in {@code columnWeights[i]}.
     * If {@code columnWeights} has more elements than the number
     * of columns, the excess elements are ignored - they do
     * not cause more columns to be created.
     *
     * @serial
     */
    public double[] columnWeights;

    /**
     * This field holds the overrides to the row weights.
     * If this field is non-{@code null} the values are
     * applied to the gridbag after all of the rows
     * weights have been calculated.
     * If {@code rowWeights[i] > } weight for row i, then
     * row i is assigned the weight in {@code rowWeights[i]}.
     * If {@code rowWeights} has more elements than the number
     * of rows, the excess elements are ignored - they do
     * not cause more rows to be created.
     *
     * @serial
     */
    public double[] rowWeights;

    /**
     * The component being positioned.  This is set before calling into
     * {@code adjustForGravity}.
     */
    private Component componentAdjusting;

    /**
     * Creates a grid bag layout manager.
     */
    public GridBagLayout () {
        comptable = new Hashtable<Component,GridBagConstraints>();
        defaultConstraints = new GridBagConstraints();
    }

    /**
     * Sets the constraints for the specified component in this layout.
     * @param       comp the component to be modified
     * @param       constraints the constraints to be applied
     */
    public void setConstraints(Component comp, GridBagConstraints constraints) {
        comptable.put(comp, (GridBagConstraints)constraints.clone());
    }

    /**
     * Gets the constraints for the specified component.  A copy of
     * the actual {@code GridBagConstraints} object is returned.
     * @param       comp the component to be queried
     * @return      the constraint for the specified component in this
     *                  grid bag layout; a copy of the actual constraint
     *                  object is returned
     */
    public GridBagConstraints getConstraints(Component comp) {
        GridBagConstraints constraints = comptable.get(comp);
        if (constraints == null) {
            setConstraints(comp, defaultConstraints);
            constraints = comptable.get(comp);
        }
        return (GridBagConstraints)constraints.clone();
    }

    /**
     * Retrieves the constraints for the specified component.
     * The return value is not a copy, but is the actual
     * {@code GridBagConstraints} object used by the layout mechanism.
     * <p>
     * If {@code comp} is not in the {@code GridBagLayout},
     * a set of default {@code GridBagConstraints} are returned.
     * A {@code comp} value of {@code null} is invalid
     * and returns {@code null}.
     *
     * @param       comp the component to be queried
     * @return      the constraints for the specified component
     */
    protected GridBagConstraints lookupConstraints(Component comp) {
        GridBagConstraints constraints = comptable.get(comp);
        if (constraints == null) {
            setConstraints(comp, defaultConstraints);
            constraints = comptable.get(comp);
        }
        return constraints;
    }

    /**
     * Removes the constraints for the specified component in this layout
     * @param       comp the component to be modified
     */
    private void removeConstraints(Component comp) {
        comptable.remove(comp);
    }

    /**
     * Determines the origin of the layout area, in the graphics coordinate
     * space of the target container.  This value represents the pixel
     * coordinates of the top-left corner of the layout area regardless of
     * the {@code ComponentOrientation} value of the container.  This
     * is distinct from the grid origin given by the cell coordinates (0,0).
     * Most applications do not call this method directly.
     * @return     the graphics origin of the cell in the top-left
     *             corner of the layout grid
     * @see        java.awt.ComponentOrientation
     * @since      1.1
     */
    public Point getLayoutOrigin () {
        Point origin = new Point(0,0);
        if (layoutInfo != null) {
            origin.x = layoutInfo.startx;
            origin.y = layoutInfo.starty;
        }
        return origin;
    }

    /**
     * Determines column widths and row heights for the layout grid.
     * <p>
     * Most applications do not call this method directly.
     * @return     an array of two arrays, containing the widths
     *                       of the layout columns and
     *                       the heights of the layout rows
     * @since      1.1
     */
    public int [][] getLayoutDimensions () {
        if (layoutInfo == null)
            return new int[2][0];

        int[][] dim = new int [2][];
        dim[0] = new int[layoutInfo.width];
        dim[1] = new int[layoutInfo.height];

        System.arraycopy(layoutInfo.minWidth, 0, dim[0], 0, layoutInfo.width);
        System.arraycopy(layoutInfo.minHeight, 0, dim[1], 0, layoutInfo.height);

        return dim;
    }

    /**
     * Determines the weights of the layout grid's columns and rows.
     * Weights are used to calculate how much a given column or row
     * stretches beyond its preferred size, if the layout has extra
     * room to fill.
     * <p>
     * Most applications do not call this method directly.
     * @return      an array of two arrays, representing the
     *                    horizontal weights of the layout columns
     *                    and the vertical weights of the layout rows
     * @since       1.1
     */
    public double [][] getLayoutWeights () {
        if (layoutInfo == null)
            return new double[2][0];

        double[][] weights = new double [2][];
        weights[0] = new double[layoutInfo.width];
        weights[1] = new double[layoutInfo.height];

        System.arraycopy(layoutInfo.weightX, 0, weights[0], 0, layoutInfo.width);
        System.arraycopy(layoutInfo.weightY, 0, weights[1], 0, layoutInfo.height);

        return weights;
    }

    /**
     * Determines which cell in the layout grid contains the point
     * specified by <code>(x,&nbsp;y)</code>. Each cell is identified
     * by its column index (ranging from 0 to the number of columns
     * minus 1) and its row index (ranging from 0 to the number of
     * rows minus 1).
     * <p>
     * If the <code>(x,&nbsp;y)</code> point lies
     * outside the grid, the following rules are used.
     * The column index is returned as zero if {@code x} lies to the
     * left of the layout for a left-to-right container or to the right of
     * the layout for a right-to-left container.  The column index is returned
     * as the number of columns if {@code x} lies
     * to the right of the layout in a left-to-right container or to the left
     * in a right-to-left container.
     * The row index is returned as zero if {@code y} lies above the
     * layout, and as the number of rows if {@code y} lies
     * below the layout.  The orientation of a container is determined by its
     * {@code ComponentOrientation} property.
     * @param      x    the <i>x</i> coordinate of a point
     * @param      y    the <i>y</i> coordinate of a point
     * @return     an ordered pair of indexes that indicate which cell
     *             in the layout grid contains the point
     *             (<i>x</i>,&nbsp;<i>y</i>).
     * @see        java.awt.ComponentOrientation
     * @since      1.1
     */
    public Point location(int x, int y) {
        Point loc = new Point(0,0);
        int i, d;

        if (layoutInfo == null)
            return loc;

        d = layoutInfo.startx;
        if (!rightToLeft) {
            for (i=0; i<layoutInfo.width; i++) {
                d += layoutInfo.minWidth[i];
                if (d > x)
                    break;
            }
        } else {
            for (i=layoutInfo.width-1; i>=0; i--) {
                if (d > x)
                    break;
                d += layoutInfo.minWidth[i];
            }
            i++;
        }
        loc.x = i;

        d = layoutInfo.starty;
        for (i=0; i<layoutInfo.height; i++) {
            d += layoutInfo.minHeight[i];
            if (d > y)
                break;
        }
        loc.y = i;

        return loc;
    }

    /**
     * Has no effect, since this layout manager does not use a per-component string.
     */
    public void addLayoutComponent(String name, Component comp) {
    }

    /**
     * Adds the specified component to the layout, using the specified
     * {@code constraints} object.  Note that constraints
     * are mutable and are, therefore, cloned when cached.
     *
     * @param      comp         the component to be added
     * @param      constraints  an object that determines how
     *                          the component is added to the layout
     * @exception IllegalArgumentException if {@code constraints}
     *            is not a {@code GridBagConstraint}
     */
    public void addLayoutComponent(Component comp, Object constraints) {
        if (constraints instanceof GridBagConstraints) {
            setConstraints(comp, (GridBagConstraints)constraints);
        } else if (constraints != null) {
            throw new IllegalArgumentException("cannot add to layout: constraints must be a GridBagConstraint");
        }
    }

    /**
     * Removes the specified component from this layout.
     * <p>
     * Most applications do not call this method directly.
     * @param    comp   the component to be removed.
     * @see      java.awt.Container#remove(java.awt.Component)
     * @see      java.awt.Container#removeAll()
     */
    public void removeLayoutComponent(Component comp) {
        removeConstraints(comp);
    }

    /**
     * Determines the preferred size of the {@code parent}
     * container using this grid bag layout.
     * <p>
     * Most applications do not call this method directly.
     *
     * @param     parent   the container in which to do the layout
     * @see       java.awt.Container#getPreferredSize
     * @return the preferred size of the {@code parent}
     *  container
     */
    public Dimension preferredLayoutSize(Container parent) {
        GridBagLayoutInfo info = getLayoutInfo(parent, PREFERREDSIZE);
        return getMinSize(parent, info);
    }

    /**
     * Determines the minimum size of the {@code parent} container
     * using this grid bag layout.
     * <p>
     * Most applications do not call this method directly.
     * @param     parent   the container in which to do the layout
     * @see       java.awt.Container#doLayout
     * @return the minimum size of the {@code parent} container
     */
    public Dimension minimumLayoutSize(Container parent) {
        GridBagLayoutInfo info = getLayoutInfo(parent, MINSIZE);
        return getMinSize(parent, info);
    }

    /**
     * Returns the maximum dimensions for this layout given the components
     * in the specified target container.
     * @param target the container which needs to be laid out
     * @see Container
     * @see #minimumLayoutSize(Container)
     * @see #preferredLayoutSize(Container)
     * @return the maximum dimensions for this layout
     */
    public Dimension maximumLayoutSize(Container target) {
        return new Dimension(Integer.MAX_VALUE, Integer.MAX_VALUE);
    }

    /**
     * Returns the alignment along the x axis.  This specifies how
     * the component would like to be aligned relative to other
     * components.  The value should be a number between 0 and 1
     * where 0 represents alignment along the origin, 1 is aligned
     * the furthest away from the origin, 0.5 is centered, etc.
     *
     * @return the value {@code 0.5f} to indicate centered
     */
    public float getLayoutAlignmentX(Container parent) {
        return 0.5f;
    }

    /**
     * Returns the alignment along the y axis.  This specifies how
     * the component would like to be aligned relative to other
     * components.  The value should be a number between 0 and 1
     * where 0 represents alignment along the origin, 1 is aligned
     * the furthest away from the origin, 0.5 is centered, etc.
     *
     * @return the value {@code 0.5f} to indicate centered
     */
    public float getLayoutAlignmentY(Container parent) {
        return 0.5f;
    }

    /**
     * Invalidates the layout, indicating that if the layout manager
     * has cached information it should be discarded.
     */
    public void invalidateLayout(Container target) {
    }

    /**
     * Lays out the specified container using this grid bag layout.
     * This method reshapes components in the specified container in
     * order to satisfy the constraints of this {@code GridBagLayout}
     * object.
     * <p>
     * Most applications do not call this method directly.
     * @param parent the container in which to do the layout
     * @see java.awt.Container
     * @see java.awt.Container#doLayout
     */
    public void layoutContainer(Container parent) {
        arrangeGrid(parent);
    }

    /**
     * Returns a string representation of this grid bag layout's values.
     * @return     a string representation of this grid bag layout.
     */
    public String toString() {
        return getClass().getName();
    }

    /**
     * Print the layout information.  Useful for debugging.
     */

    /* DEBUG
     *
     *  protected void dumpLayoutInfo(GridBagLayoutInfo s) {
     *    int x;
     *
     *    System.out.println("Col\tWidth\tWeight");
     *    for (x=0; x<s.width; x++) {
     *      System.out.println(x + "\t" +
     *                   s.minWidth[x] + "\t" +
     *                   s.weightX[x]);
     *    }
     *    System.out.println("Row\tHeight\tWeight");
     *    for (x=0; x<s.height; x++) {
     *      System.out.println(x + "\t" +
     *                   s.minHeight[x] + "\t" +
     *                   s.weightY[x]);
     *    }
     *  }
     */

    /**
     * Print the layout constraints.  Useful for debugging.
     */

    /* DEBUG
     *
     *  protected void dumpConstraints(GridBagConstraints constraints) {
     *    System.out.println(
     *                 "wt " +
     *                 constraints.weightx +
     *                 " " +
     *                 constraints.weighty +
     *                 ", " +
     *
     *                 "box " +
     *                 constraints.gridx +
     *                 " " +
     *                 constraints.gridy +
     *                 " " +
     *                 constraints.gridwidth +
     *                 " " +
     *                 constraints.gridheight +
     *                 ", " +
     *
     *                 "min " +
     *                 constraints.minWidth +
     *                 " " +
     *                 constraints.minHeight +
     *                 ", " +
     *
     *                 "pad " +
     *                 constraints.insets.bottom +
     *                 " " +
     *                 constraints.insets.left +
     *                 " " +
     *                 constraints.insets.right +
     *                 " " +
     *                 constraints.insets.top +
     *                 " " +
     *                 constraints.ipadx +
     *                 " " +
     *                 constraints.ipady);
     *  }
     */

    /**
     * Fills in an instance of {@code GridBagLayoutInfo} for the
     * current set of managed children. This requires three passes through the
     * set of children:
     *
     * <ol>
     * <li>Figure out the dimensions of the layout grid.
     * <li>Determine which cells the components occupy.
     * <li>Distribute the weights and min sizes among the rows/columns.
     * </ol>
     *
     * This also caches the minsizes for all the children when they are
     * first encountered (so subsequent loops don't need to ask again).
     * <p>
     * This method should only be used internally by
     * {@code GridBagLayout}.
     *
     * @param parent  the layout container
     * @param sizeflag either {@code PREFERREDSIZE} or
     *   {@code MINSIZE}
     * @return the {@code GridBagLayoutInfo} for the set of children
     * @since 1.4
     */
    protected GridBagLayoutInfo getLayoutInfo(Container parent, int sizeflag) {
        return GetLayoutInfo(parent, sizeflag);
    }

    /*
     * Calculate maximum array sizes to allocate arrays without ensureCapacity
     * we may use preCalculated sizes in whole class because of upper estimation of
     * maximumArrayXIndex and maximumArrayYIndex.
     */

    private long[]  preInitMaximumArraySizes(Container parent){
        Component[] components = parent.getComponents();
        Component comp;
        GridBagConstraints constraints;
        int curX, curY;
        int curWidth, curHeight;
        int preMaximumArrayXIndex = 0;
        int preMaximumArrayYIndex = 0;
        long [] returnArray = new long[2];

        for (int compId = 0 ; compId < components.length ; compId++) {
            comp = components[compId];
            if (!comp.isVisible()) {
                continue;
            }

            constraints = lookupConstraints(comp);
            curX = constraints.gridx;
            curY = constraints.gridy;
            curWidth = constraints.gridwidth;
            curHeight = constraints.gridheight;

            // -1==RELATIVE, means that column|row equals to previously added component,
            // since each next Component with gridx|gridy == RELATIVE starts from
            // previous position, so we should start from previous component which
            // already used in maximumArray[X|Y]Index calculation. We could just increase
            // maximum by 1 to handle situation when component with gridx=-1 was added.
            if (curX < 0){
                curX = ++preMaximumArrayYIndex;
            }
            if (curY < 0){
                curY = ++preMaximumArrayXIndex;
            }
            // gridwidth|gridheight may be equal to RELATIVE (-1) or REMAINDER (0)
            // in any case using 1 instead of 0 or -1 should be sufficient to for
            // correct maximumArraySizes calculation
            if (curWidth <= 0){
                curWidth = 1;
            }
            if (curHeight <= 0){
                curHeight = 1;
            }

            preMaximumArrayXIndex = Math.max(curY + curHeight, preMaximumArrayXIndex);
            preMaximumArrayYIndex = Math.max(curX + curWidth, preMaximumArrayYIndex);
        } //for (components) loop
        // Must specify index++ to allocate well-working arrays.
        /* fix for 4623196.
         * now return long array instead of Point
         */
        returnArray[0] = preMaximumArrayXIndex;
        returnArray[1] = preMaximumArrayYIndex;
        return returnArray;
    } //PreInitMaximumSizes

    /**
     * This method is obsolete and supplied for backwards
     * compatibility only; new code should call {@link
     * #getLayoutInfo(java.awt.Container, int) getLayoutInfo} instead.
     *
     * Fills in an instance of {@code GridBagLayoutInfo} for the
     * current set of managed children. This method is the same
     * as {@code getLayoutInfo}; refer to {@code getLayoutInfo}
     * description for details.
     *
     * @param  parent the layout container
     * @param  sizeflag either {@code PREFERREDSIZE} or {@code MINSIZE}
     * @return the {@code GridBagLayoutInfo} for the set of children
     */
    protected GridBagLayoutInfo GetLayoutInfo(Container parent, int sizeflag) {
        synchronized (parent.getTreeLock()) {
            GridBagLayoutInfo r;
            Component comp;
            GridBagConstraints constraints;
            Dimension d;
            Component[] components = parent.getComponents();
            // Code below will address index curX+curWidth in the case of yMaxArray, weightY
            // ( respectively curY+curHeight for xMaxArray, weightX ) where
            //  curX in 0 to preInitMaximumArraySizes.y
            // Thus, the maximum index that could
            // be calculated in the following code is curX+curX.
            // EmpericMultier equals 2 because of this.

            int layoutWidth, layoutHeight;
            int []xMaxArray;
            int []yMaxArray;
            int compindex, i, k, px, py, pixels_diff, nextSize;
            int curX = 0; // constraints.gridx
            int curY = 0; // constraints.gridy
            int curWidth = 1;  // constraints.gridwidth
            int curHeight = 1;  // constraints.gridheight
            int curRow, curCol;
            double weight_diff, weight;
            int maximumArrayXIndex = 0;
            int maximumArrayYIndex = 0;
            int anchor;

            /*
             * Pass #1
             *
             * Figure out the dimensions of the layout grid (use a value of 1 for
             * zero or negative widths and heights).
             */

            layoutWidth = layoutHeight = 0;
            curRow = curCol = -1;
            long [] arraySizes = preInitMaximumArraySizes(parent);

            /* fix for 4623196.
             * If user try to create a very big grid we can
             * get NegativeArraySizeException because of integer value
             * overflow (EMPIRICMULTIPLIER*gridSize might be more then Integer.MAX_VALUE).
             * We need to detect this situation and try to create a
             * grid with Integer.MAX_VALUE size instead.
             */
            maximumArrayXIndex = (EMPIRICMULTIPLIER * arraySizes[0] > Integer.MAX_VALUE )? Integer.MAX_VALUE : EMPIRICMULTIPLIER*(int)arraySizes[0];
            maximumArrayYIndex = (EMPIRICMULTIPLIER * arraySizes[1] > Integer.MAX_VALUE )? Integer.MAX_VALUE : EMPIRICMULTIPLIER*(int)arraySizes[1];

            if (rowHeights != null){
                maximumArrayXIndex = Math.max(maximumArrayXIndex, rowHeights.length);
            }
            if (columnWidths != null){
                maximumArrayYIndex = Math.max(maximumArrayYIndex, columnWidths.length);
            }

            xMaxArray = new int[maximumArrayXIndex];
            yMaxArray = new int[maximumArrayYIndex];

            boolean hasBaseline = false;
            for (compindex = 0 ; compindex < components.length ; compindex++) {
                comp = components[compindex];
                if (!comp.isVisible())
                    continue;
                constraints = lookupConstraints(comp);

                curX = constraints.gridx;
                curY = constraints.gridy;
                curWidth = constraints.gridwidth;
                if (curWidth <= 0)
                    curWidth = 1;
                curHeight = constraints.gridheight;
                if (curHeight <= 0)
                    curHeight = 1;

                /* If x or y is negative, then use relative positioning: */
                if (curX < 0 && curY < 0) {
                    if (curRow >= 0)
                        curY = curRow;
                    else if (curCol >= 0)
                        curX = curCol;
                    else
                        curY = 0;
                }
                if (curX < 0) {
                    px = 0;
                    for (i = curY; i < (curY + curHeight); i++) {
                        px = Math.max(px, xMaxArray[i]);
                    }

                    curX = px - curX - 1;
                    if(curX < 0)
                        curX = 0;
                }
                else if (curY < 0) {
                    py = 0;
                    for (i = curX; i < (curX + curWidth); i++) {
                        py = Math.max(py, yMaxArray[i]);
                    }
                    curY = py - curY - 1;
                    if(curY < 0)
                        curY = 0;
                }

                /* Adjust the grid width and height
                 *  fix for 5005945: unnecessary loops removed
                 */
                px = curX + curWidth;
                if (layoutWidth < px) {
                    layoutWidth = px;
                }
                py = curY + curHeight;
                if (layoutHeight < py) {
                    layoutHeight = py;
                }

                /* Adjust xMaxArray and yMaxArray */
                for (i = curX; i < (curX + curWidth); i++) {
                    yMaxArray[i] =py;
                }
                for (i = curY; i < (curY + curHeight); i++) {
                    xMaxArray[i] = px;
                }


                /* Cache the current child's size. */
                if (sizeflag == PREFERREDSIZE)
                    d = comp.getPreferredSize();
                else
                    d = comp.getMinimumSize();
                constraints.minWidth = d.width;
                constraints.minHeight = d.height;
                if (calculateBaseline(comp, constraints, d)) {
                    hasBaseline = true;
                }

                /* Zero width and height must mean that this is the last item (or
                 * else something is wrong). */
                if (constraints.gridheight == 0 && constraints.gridwidth == 0)
                    curRow = curCol = -1;

                /* Zero width starts a new row */
                if (constraints.gridheight == 0 && curRow < 0)
                    curCol = curX + curWidth;

                /* Zero height starts a new column */
                else if (constraints.gridwidth == 0 && curCol < 0)
                    curRow = curY + curHeight;
            } //for (components) loop


            /*
             * Apply minimum row/column dimensions
             */
            if (columnWidths != null && layoutWidth < columnWidths.length)
                layoutWidth = columnWidths.length;
            if (rowHeights != null && layoutHeight < rowHeights.length)
                layoutHeight = rowHeights.length;

            r = new GridBagLayoutInfo(layoutWidth, layoutHeight);

            /*
             * Pass #2
             *
             * Negative values for gridX are filled in with the current x value.
             * Negative values for gridY are filled in with the current y value.
             * Negative or zero values for gridWidth and gridHeight end the current
             *  row or column, respectively.
             */

            curRow = curCol = -1;

            Arrays.fill(xMaxArray, 0);
            Arrays.fill(yMaxArray, 0);

            int[] maxAscent = null;
            int[] maxDescent = null;
            short[] baselineType = null;

            if (hasBaseline) {
                r.maxAscent = maxAscent = new int[layoutHeight];
                r.maxDescent = maxDescent = new int[layoutHeight];
                r.baselineType = baselineType = new short[layoutHeight];
                r.hasBaseline = true;
            }


            for (compindex = 0 ; compindex < components.length ; compindex++) {
                comp = components[compindex];
                if (!comp.isVisible())
                    continue;
                constraints = lookupConstraints(comp);

                curX = constraints.gridx;
                curY = constraints.gridy;
                curWidth = constraints.gridwidth;
                curHeight = constraints.gridheight;

                /* If x or y is negative, then use relative positioning: */
                if (curX < 0 && curY < 0) {
                    if(curRow >= 0)
                        curY = curRow;
                    else if(curCol >= 0)
                        curX = curCol;
                    else
                        curY = 0;
                }

                if (curX < 0) {
                    if (curHeight <= 0) {
                        curHeight += r.height - curY;
                        if (curHeight < 1)
                            curHeight = 1;
                    }

                    px = 0;
                    for (i = curY; i < (curY + curHeight); i++)
                        px = Math.max(px, xMaxArray[i]);

                    curX = px - curX - 1;
                    if(curX < 0)
                        curX = 0;
                }
                else if (curY < 0) {
                    if (curWidth <= 0) {
                        curWidth += r.width - curX;
                        if (curWidth < 1)
                            curWidth = 1;
                    }

                    py = 0;
                    for (i = curX; i < (curX + curWidth); i++){
                        py = Math.max(py, yMaxArray[i]);
                    }

                    curY = py - curY - 1;
                    if(curY < 0)
                        curY = 0;
                }

                if (curWidth <= 0) {
                    curWidth += r.width - curX;
                    if (curWidth < 1)
                        curWidth = 1;
                }

                if (curHeight <= 0) {
                    curHeight += r.height - curY;
                    if (curHeight < 1)
                        curHeight = 1;
                }

                px = curX + curWidth;
                py = curY + curHeight;

                for (i = curX; i < (curX + curWidth); i++) { yMaxArray[i] = py; }
                for (i = curY; i < (curY + curHeight); i++) { xMaxArray[i] = px; }

                /* Make negative sizes start a new row/column */
                if (constraints.gridheight == 0 && constraints.gridwidth == 0)
                    curRow = curCol = -1;
                if (constraints.gridheight == 0 && curRow < 0)
                    curCol = curX + curWidth;
                else if (constraints.gridwidth == 0 && curCol < 0)
                    curRow = curY + curHeight;

                /* Assign the new values to the gridbag child */
                constraints.tempX = curX;
                constraints.tempY = curY;
                constraints.tempWidth = curWidth;
                constraints.tempHeight = curHeight;

                anchor = constraints.anchor;
                if (hasBaseline) {
                    switch(anchor) {
                    case GridBagConstraints.BASELINE:
                    case GridBagConstraints.BASELINE_LEADING:
                    case GridBagConstraints.BASELINE_TRAILING:
                        if (constraints.ascent >= 0) {
                            if (curHeight == 1) {
                                maxAscent[curY] =
                                        Math.max(maxAscent[curY],
                                                 constraints.ascent);
                                maxDescent[curY] =
                                        Math.max(maxDescent[curY],
                                                 constraints.descent);
                            }
                            else {
                                if (constraints.baselineResizeBehavior ==
                                        Component.BaselineResizeBehavior.
                                        CONSTANT_DESCENT) {
                                    maxDescent[curY + curHeight - 1] =
                                        Math.max(maxDescent[curY + curHeight
                                                            - 1],
                                                 constraints.descent);
                                }
                                else {
                                    maxAscent[curY] = Math.max(maxAscent[curY],
                                                           constraints.ascent);
                                }
                            }
                            if (constraints.baselineResizeBehavior ==
                                    Component.BaselineResizeBehavior.CONSTANT_DESCENT) {
                                baselineType[curY + curHeight - 1] |=
                                        (1 << constraints.
                                         baselineResizeBehavior.ordinal());
                            }
                            else {
                                baselineType[curY] |= (1 << constraints.
                                             baselineResizeBehavior.ordinal());
                            }
                        }
                        break;
                    case GridBagConstraints.ABOVE_BASELINE:
                    case GridBagConstraints.ABOVE_BASELINE_LEADING:
                    case GridBagConstraints.ABOVE_BASELINE_TRAILING:
                        // Component positioned above the baseline.
                        // To make the bottom edge of the component aligned
                        // with the baseline the bottom inset is
                        // added to the descent, the rest to the ascent.
                        pixels_diff = constraints.minHeight +
                                constraints.insets.top +
                                constraints.ipady;
                        maxAscent[curY] = Math.max(maxAscent[curY],
                                                   pixels_diff);
                        maxDescent[curY] = Math.max(maxDescent[curY],
                                                    constraints.insets.bottom);
                        break;
                    case GridBagConstraints.BELOW_BASELINE:
                    case GridBagConstraints.BELOW_BASELINE_LEADING:
                    case GridBagConstraints.BELOW_BASELINE_TRAILING:
                        // Component positioned below the baseline.
                        // To make the top edge of the component aligned
                        // with the baseline the top inset is
                        // added to the ascent, the rest to the descent.
                        pixels_diff = constraints.minHeight +
                                constraints.insets.bottom + constraints.ipady;
                        maxDescent[curY] = Math.max(maxDescent[curY],
                                                    pixels_diff);
                        maxAscent[curY] = Math.max(maxAscent[curY],
                                                   constraints.insets.top);
                        break;
                    }
                }
            }

            r.weightX = new double[maximumArrayYIndex];
            r.weightY = new double[maximumArrayXIndex];
            r.minWidth = new int[maximumArrayYIndex];
            r.minHeight = new int[maximumArrayXIndex];


            /*
             * Apply minimum row/column dimensions and weights
             */
            if (columnWidths != null)
                System.arraycopy(columnWidths, 0, r.minWidth, 0, columnWidths.length);
            if (rowHeights != null)
                System.arraycopy(rowHeights, 0, r.minHeight, 0, rowHeights.length);
            if (columnWeights != null)
                System.arraycopy(columnWeights, 0, r.weightX, 0,  Math.min(r.weightX.length, columnWeights.length));
            if (rowWeights != null)
                System.arraycopy(rowWeights, 0, r.weightY, 0,  Math.min(r.weightY.length, rowWeights.length));

            /*
             * Pass #3
             *
             * Distribute the minimum widths and weights:
             */

            nextSize = Integer.MAX_VALUE;

            for (i = 1;
                 i != Integer.MAX_VALUE;
                 i = nextSize, nextSize = Integer.MAX_VALUE) {
                for (compindex = 0 ; compindex < components.length ; compindex++) {
                    comp = components[compindex];
                    if (!comp.isVisible())
                        continue;
                    constraints = lookupConstraints(comp);

                    if (constraints.tempWidth == i) {
                        px = constraints.tempX + constraints.tempWidth; /* right column */

                        /*
                         * Figure out if we should use this child's weight.  If the weight
                         * is less than the total weight spanned by the width of the cell,
                         * then discard the weight.  Otherwise split the difference
                         * according to the existing weights.
                         */

                        weight_diff = constraints.weightx;
                        for (k = constraints.tempX; k < px; k++)
                            weight_diff -= r.weightX[k];
                        if (weight_diff > 0.0) {
                            weight = 0.0;
                            for (k = constraints.tempX; k < px; k++)
                                weight += r.weightX[k];
                            for (k = constraints.tempX; weight > 0.0 && k < px; k++) {
                                double wt = r.weightX[k];
                                double dx = (wt * weight_diff) / weight;
                                r.weightX[k] += dx;
                                weight_diff -= dx;
                                weight -= wt;
                            }
                            /* Assign the remainder to the rightmost cell */
                            r.weightX[px-1] += weight_diff;
                        }

                        /*
                         * Calculate the minWidth array values.
                         * First, figure out how wide the current child needs to be.
                         * Then, see if it will fit within the current minWidth values.
                         * If it will not fit, add the difference according to the
                         * weightX array.
                         */

                        pixels_diff =
                            constraints.minWidth + constraints.ipadx +
                            constraints.insets.left + constraints.insets.right;

                        for (k = constraints.tempX; k < px; k++)
                            pixels_diff -= r.minWidth[k];
                        if (pixels_diff > 0) {
                            weight = 0.0;
                            for (k = constraints.tempX; k < px; k++)
                                weight += r.weightX[k];
                            for (k = constraints.tempX; weight > 0.0 && k < px; k++) {
                                double wt = r.weightX[k];
                                int dx = (int)((wt * ((double)pixels_diff)) / weight);
                                r.minWidth[k] += dx;
                                pixels_diff -= dx;
                                weight -= wt;
                            }
                            /* Any leftovers go into the rightmost cell */
                            r.minWidth[px-1] += pixels_diff;
                        }
                    }
                    else if (constraints.tempWidth > i && constraints.tempWidth < nextSize)
                        nextSize = constraints.tempWidth;


                    if (constraints.tempHeight == i) {
                        py = constraints.tempY + constraints.tempHeight; /* bottom row */

                        /*
                         * Figure out if we should use this child's weight.  If the weight
                         * is less than the total weight spanned by the height of the cell,
                         * then discard the weight.  Otherwise split it the difference
                         * according to the existing weights.
                         */

                        weight_diff = constraints.weighty;
                        for (k = constraints.tempY; k < py; k++)
                            weight_diff -= r.weightY[k];
                        if (weight_diff > 0.0) {
                            weight = 0.0;
                            for (k = constraints.tempY; k < py; k++)
                                weight += r.weightY[k];
                            for (k = constraints.tempY; weight > 0.0 && k < py; k++) {
                                double wt = r.weightY[k];
                                double dy = (wt * weight_diff) / weight;
                                r.weightY[k] += dy;
                                weight_diff -= dy;
                                weight -= wt;
                            }
                            /* Assign the remainder to the bottom cell */
                            r.weightY[py-1] += weight_diff;
                        }

                        /*
                         * Calculate the minHeight array values.
                         * First, figure out how tall the current child needs to be.
                         * Then, see if it will fit within the current minHeight values.
                         * If it will not fit, add the difference according to the
                         * weightY array.
                         */

                        pixels_diff = -1;
                        if (hasBaseline) {
                            switch(constraints.anchor) {
                            case GridBagConstraints.BASELINE:
                            case GridBagConstraints.BASELINE_LEADING:
                            case GridBagConstraints.BASELINE_TRAILING:
                                if (constraints.ascent >= 0) {
                                    if (constraints.tempHeight == 1) {
                                        pixels_diff =
                                            maxAscent[constraints.tempY] +
                                            maxDescent[constraints.tempY];
                                    }
                                    else if (constraints.baselineResizeBehavior !=
                                             Component.BaselineResizeBehavior.
                                             CONSTANT_DESCENT) {
                                        pixels_diff =
                                                maxAscent[constraints.tempY] +
                                                constraints.descent;
                                    }
                                    else {
                                        pixels_diff = constraints.ascent +
                                                maxDescent[constraints.tempY +
                                                   constraints.tempHeight - 1];
                                    }
                                }
                                break;
                            case GridBagConstraints.ABOVE_BASELINE:
                            case GridBagConstraints.ABOVE_BASELINE_LEADING:
                            case GridBagConstraints.ABOVE_BASELINE_TRAILING:
                                pixels_diff = constraints.insets.top +
                                        constraints.minHeight +
                                        constraints.ipady +
                                        maxDescent[constraints.tempY];
                                break;
                            case GridBagConstraints.BELOW_BASELINE:
                            case GridBagConstraints.BELOW_BASELINE_LEADING:
                            case GridBagConstraints.BELOW_BASELINE_TRAILING:
                                pixels_diff = maxAscent[constraints.tempY] +
                                        constraints.minHeight +
                                        constraints.insets.bottom +
                                        constraints.ipady;
                                break;
                            }
                        }
                        if (pixels_diff == -1) {
                            pixels_diff =
                                constraints.minHeight + constraints.ipady +
                                constraints.insets.top +
                                constraints.insets.bottom;
                        }
                        for (k = constraints.tempY; k < py; k++)
                            pixels_diff -= r.minHeight[k];
                        if (pixels_diff > 0) {
                            weight = 0.0;
                            for (k = constraints.tempY; k < py; k++)
                                weight += r.weightY[k];
                            for (k = constraints.tempY; weight > 0.0 && k < py; k++) {
                                double wt = r.weightY[k];
                                int dy = (int)((wt * ((double)pixels_diff)) / weight);
                                r.minHeight[k] += dy;
                                pixels_diff -= dy;
                                weight -= wt;
                            }
                            /* Any leftovers go into the bottom cell */
                            r.minHeight[py-1] += pixels_diff;
                        }
                    }
                    else if (constraints.tempHeight > i &&
                             constraints.tempHeight < nextSize)
                        nextSize = constraints.tempHeight;
                }
            }
            return r;
        }
    } //getLayoutInfo()

    /**
     * Calculate the baseline for the specified component.
     * If {@code c} is positioned along it's baseline, the baseline is
     * obtained and the {@code constraints} ascent, descent and
     * baseline resize behavior are set from the component; and true is
     * returned. Otherwise false is returned.
     */
    private boolean calculateBaseline(Component c,
                                      GridBagConstraints constraints,
                                      Dimension size) {
        int anchor = constraints.anchor;
        if (anchor == GridBagConstraints.BASELINE ||
                anchor == GridBagConstraints.BASELINE_LEADING ||
                anchor == GridBagConstraints.BASELINE_TRAILING) {
            // Apply the padding to the component, then ask for the baseline.
            int w = size.width + constraints.ipadx;
            int h = size.height + constraints.ipady;
            constraints.ascent = c.getBaseline(w, h);
            if (constraints.ascent >= 0) {
                // Component has a baseline
                int baseline = constraints.ascent;
                // Adjust the ascent and descent to include the insets.
                constraints.descent = h - constraints.ascent +
                            constraints.insets.bottom;
                constraints.ascent += constraints.insets.top;
                constraints.baselineResizeBehavior =
                        c.getBaselineResizeBehavior();
                constraints.centerPadding = 0;
                if (constraints.baselineResizeBehavior == Component.
                        BaselineResizeBehavior.CENTER_OFFSET) {
                    // Component has a baseline resize behavior of
                    // CENTER_OFFSET, calculate centerPadding and
                    // centerOffset (see the description of
                    // CENTER_OFFSET in the enum for details on this
                    // algorithm).
                    int nextBaseline = c.getBaseline(w, h + 1);
                    constraints.centerOffset = baseline - h / 2;
                    if (h % 2 == 0) {
                        if (baseline != nextBaseline) {
                            constraints.centerPadding = 1;
                        }
                    }
                    else if (baseline == nextBaseline){
                        constraints.centerOffset--;
                        constraints.centerPadding = 1;
                    }
                }
            }
            return true;
        }
        else {
            constraints.ascent = -1;
            return false;
        }
    }

    /**
     * Adjusts the x, y, width, and height fields to the correct
     * values depending on the constraint geometry and pads.
     * This method should only be used internally by
     * {@code GridBagLayout}.
     *
     * @param constraints the constraints to be applied
     * @param r the {@code Rectangle} to be adjusted
     * @since 1.4
     */
    protected void adjustForGravity(GridBagConstraints constraints,
                                    Rectangle r) {
        AdjustForGravity(constraints, r);
    }

    /**
     * Adjusts the x, y, width, and height fields to the correct
     * values depending on the constraint geometry and pads.
     * <p>
     * This method is obsolete and supplied for backwards
     * compatibility only; new code should call {@link
     * #adjustForGravity(java.awt.GridBagConstraints, java.awt.Rectangle)
     * adjustForGravity} instead.
     * This method is the same as {@code adjustForGravity}
     *
     * @param  constraints the constraints to be applied
     * @param  r the {@code Rectangle} to be adjusted
     */
    protected void AdjustForGravity(GridBagConstraints constraints,
                                    Rectangle r) {
        int diffx, diffy;
        int cellY = r.y;
        int cellHeight = r.height;

        if (!rightToLeft) {
            r.x += constraints.insets.left;
        } else {
            r.x -= r.width - constraints.insets.right;
        }
        r.width -= (constraints.insets.left + constraints.insets.right);
        r.y += constraints.insets.top;
        r.height -= (constraints.insets.top + constraints.insets.bottom);

        diffx = 0;
        if ((constraints.fill != GridBagConstraints.HORIZONTAL &&
             constraints.fill != GridBagConstraints.BOTH)
            && (r.width > (constraints.minWidth + constraints.ipadx))) {
            diffx = r.width - (constraints.minWidth + constraints.ipadx);
            r.width = constraints.minWidth + constraints.ipadx;
        }

        diffy = 0;
        if ((constraints.fill != GridBagConstraints.VERTICAL &&
             constraints.fill != GridBagConstraints.BOTH)
            && (r.height > (constraints.minHeight + constraints.ipady))) {
            diffy = r.height - (constraints.minHeight + constraints.ipady);
            r.height = constraints.minHeight + constraints.ipady;
        }

        switch (constraints.anchor) {
          case GridBagConstraints.BASELINE:
              r.x += diffx/2;
              alignOnBaseline(constraints, r, cellY, cellHeight);
              break;
          case GridBagConstraints.BASELINE_LEADING:
              if (rightToLeft) {
                  r.x += diffx;
              }
              alignOnBaseline(constraints, r, cellY, cellHeight);
              break;
          case GridBagConstraints.BASELINE_TRAILING:
              if (!rightToLeft) {
                  r.x += diffx;
              }
              alignOnBaseline(constraints, r, cellY, cellHeight);
              break;
          case GridBagConstraints.ABOVE_BASELINE:
              r.x += diffx/2;
              alignAboveBaseline(constraints, r, cellY, cellHeight);
              break;
          case GridBagConstraints.ABOVE_BASELINE_LEADING:
              if (rightToLeft) {
                  r.x += diffx;
              }
              alignAboveBaseline(constraints, r, cellY, cellHeight);
              break;
          case GridBagConstraints.ABOVE_BASELINE_TRAILING:
              if (!rightToLeft) {
                  r.x += diffx;
              }
              alignAboveBaseline(constraints, r, cellY, cellHeight);
              break;
          case GridBagConstraints.BELOW_BASELINE:
              r.x += diffx/2;
              alignBelowBaseline(constraints, r, cellY, cellHeight);
              break;
          case GridBagConstraints.BELOW_BASELINE_LEADING:
              if (rightToLeft) {
                  r.x += diffx;
              }
              alignBelowBaseline(constraints, r, cellY, cellHeight);
              break;
          case GridBagConstraints.BELOW_BASELINE_TRAILING:
              if (!rightToLeft) {
                  r.x += diffx;
              }
              alignBelowBaseline(constraints, r, cellY, cellHeight);
              break;
          case GridBagConstraints.CENTER:
              r.x += diffx/2;
              r.y += diffy/2;
              break;
          case GridBagConstraints.PAGE_START:
          case GridBagConstraints.NORTH:
              r.x += diffx/2;
              break;
          case GridBagConstraints.NORTHEAST:
              r.x += diffx;
              break;
          case GridBagConstraints.EAST:
              r.x += diffx;
              r.y += diffy/2;
              break;
          case GridBagConstraints.SOUTHEAST:
              r.x += diffx;
              r.y += diffy;
              break;
          case GridBagConstraints.PAGE_END:
          case GridBagConstraints.SOUTH:
              r.x += diffx/2;
              r.y += diffy;
              break;
          case GridBagConstraints.SOUTHWEST:
              r.y += diffy;
              break;
          case GridBagConstraints.WEST:
              r.y += diffy/2;
              break;
          case GridBagConstraints.NORTHWEST:
              break;
          case GridBagConstraints.LINE_START:
              if (rightToLeft) {
                  r.x += diffx;
              }
              r.y += diffy/2;
              break;
          case GridBagConstraints.LINE_END:
              if (!rightToLeft) {
                  r.x += diffx;
              }
              r.y += diffy/2;
              break;
          case GridBagConstraints.FIRST_LINE_START:
              if (rightToLeft) {
                  r.x += diffx;
              }
              break;
          case GridBagConstraints.FIRST_LINE_END:
              if (!rightToLeft) {
                  r.x += diffx;
              }
              break;
          case GridBagConstraints.LAST_LINE_START:
              if (rightToLeft) {
                  r.x += diffx;
              }
              r.y += diffy;
              break;
          case GridBagConstraints.LAST_LINE_END:
              if (!rightToLeft) {
                  r.x += diffx;
              }
              r.y += diffy;
              break;
          default:
              throw new IllegalArgumentException("illegal anchor value");
        }
    }

    /**
     * Positions on the baseline.
     *
     * @param cellY the location of the row, does not include insets
     * @param cellHeight the height of the row, does not take into account
     *        insets
     * @param r available bounds for the component, is padded by insets and
     *        ipady
     */
    private void alignOnBaseline(GridBagConstraints cons, Rectangle r,
                                 int cellY, int cellHeight) {
        if (cons.ascent >= 0) {
            if (cons.baselineResizeBehavior == Component.
                    BaselineResizeBehavior.CONSTANT_DESCENT) {
                // Anchor to the bottom.
                // Baseline is at (cellY + cellHeight - maxDescent).
                // Bottom of component (maxY) is at baseline + descent
                // of component. We need to subtract the bottom inset here
                // as the descent in the constraints object includes the
                // bottom inset.
                int maxY = cellY + cellHeight -
                      layoutInfo.maxDescent[cons.tempY + cons.tempHeight - 1] +
                      cons.descent - cons.insets.bottom;
                if (!cons.isVerticallyResizable()) {
                    // Component not resizable, calculate y location
                    // from maxY - height.
                    r.y = maxY - cons.minHeight;
                    r.height = cons.minHeight;
                } else {
                    // Component is resizable. As brb is constant descent,
                    // can expand component to fill region above baseline.
                    // Subtract out the top inset so that components insets
                    // are honored.
                    r.height = maxY - cellY - cons.insets.top;
                }
            }
            else {
                // BRB is not constant_descent
                int baseline; // baseline for the row, relative to cellY
                // Component baseline, includes insets.top
                int ascent = cons.ascent;
                if (layoutInfo.hasConstantDescent(cons.tempY)) {
                    // Mixed ascent/descent in same row, calculate position
                    // off maxDescent
                    baseline = cellHeight - layoutInfo.maxDescent[cons.tempY];
                }
                else {
                    // Only ascents/unknown in this row, anchor to top
                    baseline = layoutInfo.maxAscent[cons.tempY];
                }
                if (cons.baselineResizeBehavior == Component.
                        BaselineResizeBehavior.OTHER) {
                    // BRB is other, which means we can only determine
                    // the baseline by asking for it again giving the
                    // size we plan on using for the component.
                    boolean fits = false;
                    ascent = componentAdjusting.getBaseline(r.width, r.height);
                    if (ascent >= 0) {
                        // Component has a baseline, pad with top inset
                        // (this follows from calculateBaseline which
                        // does the same).
                        ascent += cons.insets.top;
                    }
                    if (ascent >= 0 && ascent <= baseline) {
                        // Components baseline fits within rows baseline.
                        // Make sure the descent fits within the space as well.
                        if (baseline + (r.height - ascent - cons.insets.top) <=
                                cellHeight - cons.insets.bottom) {
                            // It fits, we're good.
                            fits = true;
                        }
                        else if (cons.isVerticallyResizable()) {
                            // Doesn't fit, but it's resizable.  Try
                            // again assuming we'll get ascent again.
                            int ascent2 = componentAdjusting.getBaseline(
                                    r.width, cellHeight - cons.insets.bottom -
                                    baseline + ascent);
                            if (ascent2 >= 0) {
                                ascent2 += cons.insets.top;
                            }
                            if (ascent2 >= 0 && ascent2 <= ascent) {
                                // It'll fit
                                r.height = cellHeight - cons.insets.bottom -
                                        baseline + ascent;
                                ascent = ascent2;
                                fits = true;
                            }
                        }
                    }
                    if (!fits) {
                        // Doesn't fit, use min size and original ascent
                        ascent = cons.ascent;
                        r.width = cons.minWidth;
                        r.height = cons.minHeight;
                    }
                }
                // Reset the components y location based on
                // components ascent and baseline for row. Because ascent
                // includes the baseline
                r.y = cellY + baseline - ascent + cons.insets.top;
                if (cons.isVerticallyResizable()) {
                    switch(cons.baselineResizeBehavior) {
                    case CONSTANT_ASCENT:
                        r.height = Math.max(cons.minHeight,cellY + cellHeight -
                                            r.y - cons.insets.bottom);
                        break;
                    case CENTER_OFFSET:
                        {
                            int upper = r.y - cellY - cons.insets.top;
                            int lower = cellY + cellHeight - r.y -
                                cons.minHeight - cons.insets.bottom;
                            int delta = Math.min(upper, lower);
                            delta += delta;
                            if (delta > 0 &&
                                (cons.minHeight + cons.centerPadding +
                                 delta) / 2 + cons.centerOffset != baseline) {
                                // Off by 1
                                delta--;
                            }
                            r.height = cons.minHeight + delta;
                            r.y = cellY + baseline -
                                (r.height + cons.centerPadding) / 2 -
                                cons.centerOffset;
                        }
                        break;
                    case OTHER:
                        // Handled above
                        break;
                    default:
                        break;
                    }
                }
            }
        }
        else {
            centerVertically(cons, r, cellHeight);
        }
    }

    /**
     * Positions the specified component above the baseline. That is
     * the bottom edge of the component will be aligned along the baseline.
     * If the row does not have a baseline, this centers the component.
     */
    private void alignAboveBaseline(GridBagConstraints cons, Rectangle r,
                                    int cellY, int cellHeight) {
        if (layoutInfo.hasBaseline(cons.tempY)) {
            int maxY; // Baseline for the row
            if (layoutInfo.hasConstantDescent(cons.tempY)) {
                // Prefer descent
                maxY = cellY + cellHeight - layoutInfo.maxDescent[cons.tempY];
            }
            else {
                // Prefer ascent
                maxY = cellY + layoutInfo.maxAscent[cons.tempY];
            }
            if (cons.isVerticallyResizable()) {
                // Component is resizable. Top edge is offset by top
                // inset, bottom edge on baseline.
                r.y = cellY + cons.insets.top;
                r.height = maxY - r.y;
            }
            else {
                // Not resizable.
                r.height = cons.minHeight + cons.ipady;
                r.y = maxY - r.height;
            }
        }
        else {
            centerVertically(cons, r, cellHeight);
        }
    }

    /**
     * Positions below the baseline.
     */
    private void alignBelowBaseline(GridBagConstraints cons, Rectangle r,
                                    int cellY, int cellHeight) {
        if (layoutInfo.hasBaseline(cons.tempY)) {
            if (layoutInfo.hasConstantDescent(cons.tempY)) {
                // Prefer descent
                r.y = cellY + cellHeight - layoutInfo.maxDescent[cons.tempY];
            }
            else {
                // Prefer ascent
                r.y = cellY + layoutInfo.maxAscent[cons.tempY];
            }
            if (cons.isVerticallyResizable()) {
                r.height = cellY + cellHeight - r.y - cons.insets.bottom;
            }
        }
        else {
            centerVertically(cons, r, cellHeight);
        }
    }

    private void centerVertically(GridBagConstraints cons, Rectangle r,
                                  int cellHeight) {
        if (!cons.isVerticallyResizable()) {
            r.y += Math.max(0, (cellHeight - cons.insets.top -
                                cons.insets.bottom - cons.minHeight -
                                cons.ipady) / 2);
        }
    }

    /**
     * Figures out the minimum size of the
     * parent based on the information from {@code getLayoutInfo}.
     * This method should only be used internally by
     * {@code GridBagLayout}.
     *
     * @param parent the layout container
     * @param info the layout info for this parent
     * @return a {@code Dimension} object containing the
     *   minimum size
     * @since 1.4
     */
    protected Dimension getMinSize(Container parent, GridBagLayoutInfo info) {
        return GetMinSize(parent, info);
    }

    /**
     * This method is obsolete and supplied for backwards
     * compatibility only; new code should call {@link
     * #getMinSize(java.awt.Container, GridBagLayoutInfo) getMinSize} instead.
     * This method is the same as {@code getMinSize}
     *
     * @param  parent the layout container
     * @param  info the layout info for this parent
     * @return a {@code Dimension} object containing the
     *         minimum size
     */
    protected Dimension GetMinSize(Container parent, GridBagLayoutInfo info) {
        Dimension d = new Dimension();
        int i, t;
        Insets insets = parent.getInsets();

        t = 0;
        for(i = 0; i < info.width; i++)
            t += info.minWidth[i];
        d.width = t + insets.left + insets.right;

        t = 0;
        for(i = 0; i < info.height; i++)
            t += info.minHeight[i];
        d.height = t + insets.top + insets.bottom;

        return d;
    }

    transient boolean rightToLeft = false;

    /**
     * Lays out the grid.
     * This method should only be used internally by
     * {@code GridBagLayout}.
     *
     * @param parent the layout container
     * @since 1.4
     */
    protected void arrangeGrid(Container parent) {
        ArrangeGrid(parent);
    }

    /**
     * This method is obsolete and supplied for backwards
     * compatibility only; new code should call {@link
     * #arrangeGrid(Container) arrangeGrid} instead.
     * This method is the same as {@code arrangeGrid}
     *
     * @param  parent the layout container
     */
    protected void ArrangeGrid(Container parent) {
        Component comp;
        int compindex;
        GridBagConstraints constraints;
        Insets insets = parent.getInsets();
        Component[] components = parent.getComponents();
        Dimension d;
        Rectangle r = new Rectangle();
        int i, diffw, diffh;
        double weight;
        GridBagLayoutInfo info;

        rightToLeft = !parent.getComponentOrientation().isLeftToRight();

        /*
         * If the parent has no children anymore, then don't do anything
         * at all:  just leave the parent's size as-is.
         */
        if (components.length == 0 &&
            (columnWidths == null || columnWidths.length == 0) &&
            (rowHeights == null || rowHeights.length == 0)) {
            return;
        }

        /*
         * Pass #1: scan all the children to figure out the total amount
         * of space needed.
         */

        info = getLayoutInfo(parent, PREFERREDSIZE);
        d = getMinSize(parent, info);

        if (parent.width < d.width || parent.height < d.height) {
            info = getLayoutInfo(parent, MINSIZE);
            d = getMinSize(parent, info);
        }

        layoutInfo = info;
        r.width = d.width;
        r.height = d.height;

        /*
         * DEBUG
         *
         * DumpLayoutInfo(info);
         * for (compindex = 0 ; compindex < components.length ; compindex++) {
         * comp = components[compindex];
         * if (!comp.isVisible())
         *      continue;
         * constraints = lookupConstraints(comp);
         * DumpConstraints(constraints);
         * }
         * System.out.println("minSize " + r.width + " " + r.height);
         */

        /*
         * If the current dimensions of the window don't match the desired
         * dimensions, then adjust the minWidth and minHeight arrays
         * according to the weights.
         */

        diffw = parent.width - r.width;
        if (diffw != 0) {
            weight = 0.0;
            for (i = 0; i < info.width; i++)
                weight += info.weightX[i];
            if (weight > 0.0) {
                for (i = 0; i < info.width; i++) {
                    int dx = (int)(( ((double)diffw) * info.weightX[i]) / weight);
                    info.minWidth[i] += dx;
                    r.width += dx;
                    if (info.minWidth[i] < 0) {
                        r.width -= info.minWidth[i];
                        info.minWidth[i] = 0;
                    }
                }
            }
            diffw = parent.width - r.width;
        }

        else {
            diffw = 0;
        }

        diffh = parent.height - r.height;
        if (diffh != 0) {
            weight = 0.0;
            for (i = 0; i < info.height; i++)
                weight += info.weightY[i];
            if (weight > 0.0) {
                for (i = 0; i < info.height; i++) {
                    int dy = (int)(( ((double)diffh) * info.weightY[i]) / weight);
                    info.minHeight[i] += dy;
                    r.height += dy;
                    if (info.minHeight[i] < 0) {
                        r.height -= info.minHeight[i];
                        info.minHeight[i] = 0;
                    }
                }
            }
            diffh = parent.height - r.height;
        }

        else {
            diffh = 0;
        }

        /*
         * DEBUG
         *
         * System.out.println("Re-adjusted:");
         * DumpLayoutInfo(info);
         */

        /*
         * Now do the actual layout of the children using the layout information
         * that has been collected.
         */

        info.startx = diffw/2 + insets.left;
        info.starty = diffh/2 + insets.top;

        for (compindex = 0 ; compindex < components.length ; compindex++) {
            comp = components[compindex];
            if (!comp.isVisible()){
                continue;
            }
            constraints = lookupConstraints(comp);

            if (!rightToLeft) {
                r.x = info.startx;
                for(i = 0; i < constraints.tempX; i++)
                    r.x += info.minWidth[i];
            } else {
                r.x = parent.width - (diffw/2 + insets.right);
                for(i = 0; i < constraints.tempX; i++)
                    r.x -= info.minWidth[i];
            }

            r.y = info.starty;
            for(i = 0; i < constraints.tempY; i++)
                r.y += info.minHeight[i];

            r.width = 0;
            for(i = constraints.tempX;
                i < (constraints.tempX + constraints.tempWidth);
                i++) {
                r.width += info.minWidth[i];
            }

            r.height = 0;
            for(i = constraints.tempY;
                i < (constraints.tempY + constraints.tempHeight);
                i++) {
                r.height += info.minHeight[i];
            }

            componentAdjusting = comp;
            adjustForGravity(constraints, r);

            /* fix for 4408108 - components were being created outside of the container */
            /* fix for 4969409 "-" replaced by "+"  */
            if (r.x < 0) {
                r.width += r.x;
                r.x = 0;
            }

            if (r.y < 0) {
                r.height += r.y;
                r.y = 0;
            }

            /*
             * If the window is too small to be interesting then
             * unmap it.  Otherwise configure it and then make sure
             * it's mapped.
             */

            if ((r.width <= 0) || (r.height <= 0)) {
                comp.setBounds(0, 0, 0, 0);
            }
            else {
                if (comp.x != r.x || comp.y != r.y ||
                    comp.width != r.width || comp.height != r.height) {
                    comp.setBounds(r.x, r.y, r.width, r.height);
                }
            }
        }
    }

    // Added for serial backwards compatibility (4348425)
    static final long serialVersionUID = 8838754796412211005L;
}