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1 /*
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2 * CDDL HEADER START
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3 *
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4 * The contents of this file are subject to the terms of the
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5 * Common Development and Distribution License, Version 1.0 only
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6 * (the "License"). You may not use this file except in compliance
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7 * with the License.
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8 *
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9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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10 * or http://www.opensolaris.org/os/licensing.
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11 * See the License for the specific language governing permissions
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12 * and limitations under the License.
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13 *
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14 * When distributing Covered Code, include this CDDL HEADER in each
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15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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16 * If applicable, add the following below this CDDL HEADER, with the
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17 * fields enclosed by brackets "[]" replaced with your own identifying
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18 * information: Portions Copyright [yyyy] [name of copyright owner]
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19 *
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20 * CDDL HEADER END
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21 */
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22 /*
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23 * ident "@(#)AutosizingTable.java 1.5 05/06/08 SMI"
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24 *
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25 * Copyright (c) 1999-2001 by Sun Microsystems, Inc.
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26 * All rights reserved.
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27 */
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28 package com.sun.dhcpmgr.ui;
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29
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30 import javax.swing.JTable;
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31 import javax.swing.table.*;
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32 import javax.swing.event.TableModelEvent;
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33 import java.awt.Component;
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34 import java.util.Date;
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35
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36 import com.sun.dhcpmgr.data.IPAddress;
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37 import com.sun.dhcpmgr.data.ValidationException;
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38
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39 /**
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40 * A subclass of Swing's JTable which automatically resizes its columns to
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41 * fit the data being displayed in them.
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42 */
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43 public class AutosizingTable extends JTable {
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44 Date aDate = null;
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45 IPAddress longIP = null;
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46
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47 /**
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48 * Construct the table
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49 */
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50 public AutosizingTable() {
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51 super();
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52 }
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53
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54 /**
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55 * Construct the table with the given model.
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56 * @param model the TableModel to be used.
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57 */
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58 public AutosizingTable(TableModel model) {
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59 super(model);
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60 }
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61
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62 /**
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63 * The table has changed; we'll resize the columns to contain the new data
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64 * as best they can.
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65 */
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66 public void tableChanged(TableModelEvent e) {
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67 /*
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68 * Let JTable do its thing, which probably includes wiping out
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69 * the old columns and creating new ones
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70 */
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71 super.tableChanged(e);
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72 TableModel model = getModel();
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73 if (model.getRowCount() == 0) {
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74 // No data, so just skip all the gymnastics
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75 return;
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76 }
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77 /*
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78 * Set column widths by first finding largest value in each column
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79 * and then sizing accordingly
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80 */
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81 for (int i = 0; i < getColumnCount(); ++i) {
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82 TableColumn col = getColumnModel().getColumn(i);
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83
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84 // Get the width of the header for this column
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85 TableCellRenderer r = col.getHeaderRenderer();
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86 int headerWidth = 0;
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87 Component c;
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88 if (r == null)
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89 r = getTableHeader().getDefaultRenderer();
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90 if (r != null) {
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91 c = r.getTableCellRendererComponent(this, col.getHeaderValue(),
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92 false, false, 0, 0);
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93 headerWidth = c.getPreferredSize().width;
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94 }
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95 Object maxVal = null;
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96
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97 if (model.getColumnClass(i) == String.class) {
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98 // Column contains strings; find the longest one
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99 String maxString = "";
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100 for (int j = 0; j < model.getRowCount(); ++j) {
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101 String s = (String)model.getValueAt(j, i);
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102 if (s != null) {
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103 if (maxString.length() < s.length()) {
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104 maxString = s;
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105 }
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106 }
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107 }
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108 maxVal = maxString;
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109 } else if (model.getColumnClass(i) == IPAddress.class) {
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110 // Column contains IP addresses; one long one is as good as any
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111 if (longIP == null) {
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112 try {
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113 longIP = new IPAddress("222.222.222.222");
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114 } catch (ValidationException ex) {
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115 // This should never happen!
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116 }
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117 }
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118 maxVal = longIP;
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119 } else if (model.getColumnClass(i) == Date.class) {
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120 // Column contains dates; now is as good a time as any other.
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121 if (aDate == null) {
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122 aDate = new Date();
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123 }
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124 maxVal = aDate;
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125 }
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126 // Now compute the width of the cell containing the longest value
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127 c = getDefaultRenderer(
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128 model.getColumnClass(i)).getTableCellRendererComponent(
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129 this, maxVal, false, false, 0, i);
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130 int cellWidth = c.getPreferredSize().width;
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131
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132 // Set preferred width to the greater of the header & cell widths
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133 col.setPreferredWidth(Math.max(headerWidth, cellWidth));
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134 }
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135 // Now force the resizing we just did to be displayed
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136 sizeColumnsToFit(-1);
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137
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138 // Force header to repaint itself, otherwise it won't align correctly
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139 getTableHeader().resizeAndRepaint();
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140 }
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141 }
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