    001    /* ========================================================================
    002     * JCommon : a free general purpose class library for the Java(tm) platform
    003     * ========================================================================
    004     *
    005     * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
    006     *
    007     * Project Info:  http://www.jfree.org/jcommon/index.html
    008     *
    009     * This library is free software; you can redistribute it and/or modify it
    010     * under the terms of the GNU Lesser General Public License as published by
    011     * the Free Software Foundation; either version 2.1 of the License, or
    012     * (at your option) any later version.
    013     *
    014     * This library is distributed in the hope that it will be useful, but
    015     * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    016     * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
    017     * License for more details.
    018     *
    019     * You should have received a copy of the GNU Lesser General Public
    020     * License along with this library; if not, write to the Free Software
    021     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
    022     * USA.
    023     *
    024     * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
    025     * in the United States and other countries.]
    026     *
    027     * --------------------------------
    028     * SortableTableHeaderListener.java
    029     * --------------------------------
    030     * (C) Copyright 2000-2004, by Nabuo Tamemasa and Contributors.
    031     *
    032     * Original Author:  Nabuo Tamemasa;
    033     * Contributor(s):   David Gilbert (for Object Refinery Limited);
    034     *
    035     * $Id: SortableTableHeaderListener.java,v 1.4 2005/11/16 15:58:41 taqua Exp $
    036     *
    037     * Changes (from 26-Oct-2001)
    038     * --------------------------
    039     * 26-Oct-2001 : Changed package to com.jrefinery.ui.*;
    040     * 14-Oct-2002 : Fixed errors reported by Checkstyle (DG);
    041     *
    042     */
    043
    044    package org.jfree.ui;
    045
    046    import java.awt.event.MouseEvent;
    047    import java.awt.event.MouseListener;
    048    import java.awt.event.MouseMotionListener;
    049
    050    import javax.swing.table.JTableHeader;
    051
    052    /**
    053     * Captures mouse clicks on a table header, with the intention of triggering a sort.  Adapted from
    054     * code by Nabuo Tamemasa posted on http://www.codeguru.com.
    055     *
    056     * @author Nabuo Tamemasa
    057     */
    058    public class SortableTableHeaderListener implements MouseListener, MouseMotionListener {
    059
    060        /** A reference to the table model. */
    061        private SortableTableModel model;
    062
    063        /** The header renderer. */
    064        private SortButtonRenderer renderer;
    065
    066        /** The index of the column that is sorted - used to determine the state of the renderer. */
    067        private int sortColumnIndex;
    068
    069        /**
    070         * Standard constructor.
    071         *
    072         * @param model  the model.
    073         * @param renderer  the renderer.
    074         */
    075        public SortableTableHeaderListener(final SortableTableModel model,
    076                                           final SortButtonRenderer renderer) {
    077            this.model = model;
    078            this.renderer = renderer;
    079        }
    080
    081        /**
    082         * Sets the table model for the listener.
    083         *
    084         * @param model  the model.
    085         */
    086        public void setTableModel(final SortableTableModel model) {
    087            this.model = model;
    088        }
    089
    090        /**
    091         * Handle a mouse press event - if the user is NOT resizing a column and NOT dragging a column
    092         * then give visual feedback that the column header has been pressed.
    093         *
    094         * @param e  the mouse event.
    095         */
    096        public void mousePressed(final MouseEvent e) {
    097
    098            final JTableHeader header = (JTableHeader) e.getComponent();
    099
    100            if (header.getResizingColumn() == null) {  // resizing takes precedence over sorting
    101                if (header.getDraggedDistance() < 1) {   // dragging also takes precedence over sorting
    102                    final int columnIndex = header.columnAtPoint(e.getPoint());
    103                    final int modelColumnIndex
    104                        = header.getTable().convertColumnIndexToModel(columnIndex);
    105                    if (this.model.isSortable(modelColumnIndex)) {
    106                        this.sortColumnIndex = header.getTable().convertColumnIndexToModel(columnIndex);
    107                        this.renderer.setPressedColumn(this.sortColumnIndex);
    108                        header.repaint();
    109                        if (header.getTable().isEditing()) {
    110                            header.getTable().getCellEditor().stopCellEditing();
    111                        }
    112                    }
    113                    else {
    114                        this.sortColumnIndex = -1;
    115                    }
    116                }
    117            }
    118
    119        }
    120
    121        /**
    122         * If the user is dragging or resizing, then we clear the sort column.
    123         *
    124         * @param e  the mouse event.
    125         */
    126        public void mouseDragged(final MouseEvent e) {
    127
    128            final JTableHeader header = (JTableHeader) e.getComponent();
    129
    130            if ((header.getDraggedDistance() > 0) || (header.getResizingColumn() != null)) {
    131                this.renderer.setPressedColumn(-1);
    132                this.sortColumnIndex = -1;
    133            }
    134        }
    135
    136        /**
    137         * This event is ignored (not required).
    138         *
    139         * @param e  the mouse event.
    140         */
    141        public void mouseEntered(final MouseEvent e) {
    142            // not required
    143        }
    144
    145        /**
    146         * This event is ignored (not required).
    147         *
    148         * @param e  the mouse event.
    149         */
    150        public void mouseClicked(final MouseEvent e) {
    151            // not required
    152        }
    153
    154        /**
    155         * This event is ignored (not required).
    156         *
    157         * @param e  the mouse event.
    158         */
    159        public void mouseMoved(final MouseEvent e) {
    160            // not required
    161        }
    162
    163        /**
    164         * This event is ignored (not required).
    165         *
    166         * @param e  the mouse event.
    167         */
    168        public void mouseExited(final MouseEvent e) {
    169            // not required
    170        }
    171
    172        /**
    173         * When the user releases the mouse button, we attempt to sort the table.
    174         *
    175         * @param e  the mouse event.
    176         */
    177        public void mouseReleased(final MouseEvent e) {
    178
    179            final JTableHeader header = (JTableHeader) e.getComponent();
    180
    181            if (header.getResizingColumn() == null) {  // resizing takes precedence over sorting
    182                if (this.sortColumnIndex != -1) {
    183                    final SortableTableModel model = (SortableTableModel) header.getTable().getModel();
    184                    final boolean ascending = !model.isAscending();
    185                    model.setAscending(ascending);
    186                    model.sortByColumn(this.sortColumnIndex, ascending);
    187
    188                    this.renderer.setPressedColumn(-1);       // clear
    189                    header.repaint();
    190                }
    191            }
    192        }
    193
    194    }