formatlayout.java

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/* ===================================================
 * JCommon : a free general purpose Java class library
 * ===================================================
 *
 * Project Info:  http://www.jfree.org/jcommon/index.html
 * Project Lead:  David Gilbert ([e-mail]);
 *
 * (C) Copyright 2000-2003, by Object Refinery Limited and Contributors.
 *
 * This library is free software; you can redistribute it and/or modify it under the terms
 * of the GNU Lesser General Public License as published by the Free Software Foundation;
 * either version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * -----------------
 * FormatLayout.java
 * -----------------
 * (C) Copyright 2000-2003, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: FormatLayout.java,v 1.3 2003/06/12 16:54:36 mungady Exp $
 *
 * Changes (from 26-Oct-2001)
 * --------------------------
 * 26-Oct-2001 : Changed package to com.jrefinery.layout.* (DG);
 * 26-Jun-2002 : Removed redundant code (DG);
 * 10-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 *
 */

package org.jfree.layout;

import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Insets;
import java.awt.LayoutManager;
import java.io.Serializable;

/**
 * A layout manager that spaces components over six columns in seven different formats.
 *
 * @author David Gilbert
 */
public class FormatLayout implements LayoutManager, Serializable {

    /** A useful constant representing layout format 1. */
    public static final int C = 1;

    /** A useful constant representing layout format 2. */
    public static final int LC = 2;

    /** A useful constant representing layout format 3. */
    public static final int LCB = 3;

    /** A useful constant representing layout format 4. */
    public static final int LCLC = 4;

    /** A useful constant representing layout format 5. */
    public static final int LCLCB = 5;

    /** A useful constant representing layout format 6. */
    public static final int LCBLC = 6;

    /** A useful constant representing layout format 7. */
    public static final int LCBLCB = 7;

    /** The layout format for each row. */
    private int[] rowFormats;

    /** The gap between the rows. */
    private int rowGap;

    /** The gaps between the columns (gap[0] is the gap following column zero). */
    private int[] columnGaps;

    /** Working array for recording the height of each row. */
    private int[] rowHeights;

    /** The total height of the layout. */
    private int totalHeight;

    /** Working array for recording the width of each column; */
    private int[] columnWidths;

    /** The total width of the layout. */
    private int totalWidth;

    /** Combined width of columns 1 and 2. */
    private int columns1and2Width;

    /** Combined width of columns 4 and 5. */
    private int columns4and5Width;

    /** Combined width of columns 1 to 4. */
    private int columns1to4Width;

    /** Combined width of columns 1 to 5. */
    private int columns1to5Width;

    /** Combined width of columns 0 to 5. */
    private int columns0to5Width;

    /**
     * Constructs a new layout manager that can be used to create input forms.  The layout manager
     * works by arranging components in rows using six columns (some components
     * will use more than one column).
     * <P>
     * Any component can be added, but I think of them in terms of Labels,
     * Components, and Buttons.
     * The formats available are:  C, LC, LCB, LCLC, LCLCB, LCBLC or LCBLCB.
     * <table>
     * <tr>
     * <td>C</td>
     * <td>1 component in this row (spread across all six columns).</td>
     * </tr>
     * <tr>
     * <td>LC</td>
     * <td>2 components, a label in the 1st column, and a component using the
     *      remaining 5 columns).</td>
     * </tr>
     * <tr>
     * <td>LCB</td>
     * <td>3 components, a label in the 1st column, a component spread across
     *      the next 4, and a button in the last column.</td>
     * </tr>
     * <tr>
     * <td>LCLC</td>
     * <td>4 components, a label in column 1, a component in 2-3, a label in
     *       4 and a component in 5-6.</td>
     * </tr>
     * <tr>
     * <td>LCLCB</td>
     * <td>5 components, a label in column 1, a component in 2-3, a label
     *      in 4, a component in 5 and a button in 6.</td>
     * </tr>
     * <tr>
     * <td>LCBLC</td>
     * <td>5 components, a label in column 1, a component in 2, a button in 3,
     *  a label in 4, a component in 5-6.</td>
     * </tr>
     * <tr>
     * <td>LCBLCB</td>
     * <td>6 components, one in each column.</td>
     * </tr>
     * </table>
     * <P>
     * Columns 1 and 4 expand to accommodate the widest label, and 3 and 6 to
     * accommodate the widest button.
     * <P>
     * Each row will contain the number of components indicated by the format.  Be sure to
     * specify enough row formats to cover all the components you add to the
     * layout.
     *
     * @param rowCount  the number of rows.
     * @param rowFormats  the row formats.
     */
    public FormatLayout(int rowCount, int[] rowFormats) {

        this.rowFormats = rowFormats;
        rowGap = 2;
        columnGaps = new int[5];
        columnGaps[0] = 10;
        columnGaps[1] = 5;
        columnGaps[2] = 5;
        columnGaps[3] = 10;
        columnGaps[4] = 5;

        // working structures...
        rowHeights = new int[rowCount];
        columnWidths = new int[6];
    }

    /**
     * Returns the preferred size of the component using this layout manager.
     *
     * @param parent  the parent.
     *
     * @return the preferred size of the component.
     */
    public Dimension preferredLayoutSize(Container parent) {

        Component c0, c1, c2, c3, c4, c5;

        synchronized (parent.getTreeLock()) {
            Insets insets = parent.getInsets();
            int componentIndex = 0;
            int rowCount = rowHeights.length;
            for (int i = 0; i < columnWidths.length; i++) {
                columnWidths[i] = 0;
            }
            columns1and2Width = 0;
            columns4and5Width = 0;
            columns1to4Width = 0;
            columns1to5Width = 0;
            columns0to5Width = 0;

            totalHeight = 0;
            for (int rowIndex = 0; rowIndex < rowCount; rowIndex++) {
            int format = rowFormats[rowIndex % rowFormats.length];
                switch (format) {
                    case FormatLayout.C:
                        c0 = parent.getComponent(componentIndex);
                        updateC(rowIndex, c0.getPreferredSize());
                        componentIndex = componentIndex + 1;
                        break;
                    case FormatLayout.LC:
                        c0 = parent.getComponent(componentIndex);
                        c1 = parent.getComponent(componentIndex + 1);
                        updateLC(rowIndex, c0.getPreferredSize(), c1.getPreferredSize());
                        componentIndex = componentIndex + 2;
                        break;
                    case FormatLayout.LCB:
                        c0 = parent.getComponent(componentIndex);
                        c1 = parent.getComponent(componentIndex + 1);
                        c2 = parent.getComponent(componentIndex + 2);
                        updateLCB(rowIndex,
                                  c0.getPreferredSize(),
                                  c1.getPreferredSize(),
                                  c2.getPreferredSize());
                        componentIndex = componentIndex + 3;
                        break;
                    case FormatLayout.LCLC:
                        c0 = parent.getComponent(componentIndex);
                        c1 = parent.getComponent(componentIndex + 1);
                        c2 = parent.getComponent(componentIndex + 2);
                        c3 = parent.getComponent(componentIndex + 3);
                        updateLCLC(rowIndex,
                                   c0.getPreferredSize(),
                                   c1.getPreferredSize(),
                                   c2.getPreferredSize(),
                                   c3.getPreferredSize());
                        componentIndex = componentIndex + 4;
                        break;
                    case FormatLayout.LCBLC:
                        c0 = parent.getComponent(componentIndex);
                        c1 = parent.getComponent(componentIndex + 1);
                        c2 = parent.getComponent(componentIndex + 2);
                        c3 = parent.getComponent(componentIndex + 3);
                        c4 = parent.getComponent(componentIndex + 4);
                        updateLCBLC(rowIndex,
                                    c0.getPreferredSize(),
                                    c1.getPreferredSize(),
                                    c2.getPreferredSize(),
                                    c3.getPreferredSize(),
                                    c4.getPreferredSize());
                        componentIndex = componentIndex + 5;
                        break;
                    case FormatLayout.LCLCB:
                        c0 = parent.getComponent(componentIndex);
                        c1 = parent.getComponent(componentIndex + 1);
                        c2 = parent.getComponent(componentIndex + 2);
                        c3 = parent.getComponent(componentIndex + 3);
                        c4 = parent.getComponent(componentIndex + 4);
                        updateLCLCB(rowIndex,
                                    c0.getPreferredSize(),
                                    c1.getPreferredSize(),
                                    c2.getPreferredSize(),
                                    c3.getPreferredSize(),
                                    c4.getPreferredSize());
                        componentIndex = componentIndex + 5;
                        break;
                    case FormatLayout.LCBLCB:
                        c0 = parent.getComponent(componentIndex);
                        c1 = parent.getComponent(componentIndex + 1);
                        c2 = parent.getComponent(componentIndex + 2);
                        c3 = parent.getComponent(componentIndex + 3);
                        c4 = parent.getComponent(componentIndex + 4);
                        c5 = parent.getComponent(componentIndex + 5);
                        updateLCBLCB(rowIndex,
                                     c0.getPreferredSize(),
                                     c1.getPreferredSize(),
                                     c2.getPreferredSize(),
                                     c3.getPreferredSize(),
                                     c4.getPreferredSize(),
                                     c5.getPreferredSize());
                        componentIndex = componentIndex + 6;
                        break;
                }
            }
            complete();
            return new Dimension(totalWidth + insets.left + insets.right,
                                 totalHeight + (rowCount - 1) * rowGap
                                 + insets.top + insets.bottom);
        }
    }

    /**
     * Returns the minimum size of the component using this layout manager.
     *
     * @param parent  the parent.
     *
     * @return the minimum size of the component
     */
    public Dimension minimumLayoutSize(Container parent) {

        Component c0, c1, c2, c3, c4, c5;