1 | /**********************************************************************
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2 | *
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3 | * ResultCanvas.java -- a Canvas onto which a phrase list is drawn
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4 | *
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5 | * Copyright 1997-2000 Gordon W. Paynter
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6 | * Copyright 2000 The New Zealand Digital Library Project
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7 | *
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8 | * A component of the Greenstone digital library software
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9 | * from the New Zealand Digital Library Project at the
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10 | * University of Waikato, New Zealand.
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11 | *
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12 | * This program is free software; you can redistribute it and/or modify
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13 | * it under the terms of the GNU General Public License as published by
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14 | * the Free Software Foundation; either version 2 of the License, or
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15 | * (at your option) any later version.
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16 | *
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17 | * This program is distributed in the hope that it will be useful,
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18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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20 | * GNU General Public License for more details.
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21 | *
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22 | * You should have received a copy of the GNU General Public License
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23 | * along with this program; if not, write to the Free Software
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24 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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25 | *
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26 | *********************************************************************/
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27 |
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28 | /*********************************************************************
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29 |
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30 | This class is used in the Phind java applet (Phind.java).
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31 |
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32 | The results of a query are displayed on a ResultCanvas object. Each
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33 | entry in the result list is stored in a ResultItem, and the ResultCanvas
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34 | contains a Vector of ResultItems.
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35 |
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36 | Each ResultCanvas is embedded in a ResultBox alongside a Scrollbar.
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37 | When the ResultCanvas is drawn, it looks at the scrollbar, calculates
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38 | which ResultItems are visible, then draws them on the screen.
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39 |
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40 | **********************************************************************/
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41 |
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42 | package org.greenstone.applet.phind;
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43 | //package org.nzdl.gsdl.Phind;
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44 |
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45 | import java.awt.Canvas;
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46 | import java.awt.Scrollbar;
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47 | import java.awt.Graphics;
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48 | import java.awt.Font;
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49 | import java.awt.FontMetrics;
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50 | import java.awt.Dimension;
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51 | import java.awt.Color;
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52 | import java.util.Vector;
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53 | import java.awt.Image;
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54 | //import java.awt.Event;
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55 | import java.awt.event.MouseListener;
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56 | import java.awt.event.MouseEvent;
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57 | import java.awt.event.MouseAdapter;
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58 | import java.net.URL;
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59 | import java.applet.Applet;
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60 | import java.util.Date;
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61 |
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62 | public class ResultCanvas extends Canvas {
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63 |
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64 |
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65 | // Other objects associated with this
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66 | Phind phind;
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67 | ResultBox parent;
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68 | Scrollbar scrollbar;
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69 |
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70 | // fonts and font spacings to use
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71 | Font areaPlain, areaBold;
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72 | int lineSpacing;
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73 |
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74 | // The items to display on this canvas
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75 | int numberOfItems;
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76 | int firstItemDisplayed;
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77 | int itemSelected;
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78 | Vector items;
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79 |
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80 | // the background image
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81 | public static Image backgroundImage;
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82 |
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83 |
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84 | // Create a ResultCanvas from the ResultBox which is its parent.
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85 | ResultCanvas(ResultBox p) {
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86 |
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87 | parent = p;
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88 | phind = p.phind;
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89 | scrollbar = p.s;
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90 | parent.disableScrollbar();
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91 |
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92 | areaPlain = phind.plainFont;
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93 | areaBold = phind.boldFont;
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94 |
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95 | lineSpacing = phind.fontSize + 2;
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96 |
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97 | items = new Vector();
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98 | numberOfItems = 0;
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99 | firstItemDisplayed = 0;
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100 | itemSelected = -1;
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101 |
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102 | if (backgroundImage == null) {
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103 | backgroundImage = p.phind.backgroundImage;
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104 | }
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105 |
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106 | // add a mouse listener for the mouse clicks. we only want to override
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107 | // one method, so we use the adaptor class
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108 | addMouseListener(new MouseAdapter() {
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109 | public void mouseClicked(MouseEvent evt) {
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110 | ResultCanvas.this.mouseClicked(evt);
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111 | }
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112 | });
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113 |
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114 |
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115 | }
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116 |
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117 | void resetCanvas( ) {
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118 | items.removeAllElements();
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119 | numberOfItems = 0;
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120 | repaint();
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121 | }
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122 |
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123 |
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124 | // Add a new search result.
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125 | // Return true if successful, otherwise false.
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126 | boolean addResultItem( ResultItem item ) {
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127 |
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128 | // Add a new result, in sorted order.
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129 | // First sort key is item kind (lowest first),
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130 | // second is frequency (highest first).
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131 | // This is not efficient, but I don't care right now.
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132 | int index = 0;
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133 | while ((index < numberOfItems) &&
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134 | ((item.sort < ((ResultItem) items.elementAt(index)).sort) ||
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135 | ((item.sort == ((ResultItem) items.elementAt(index)).sort) &&
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136 | (item.frequency <= ((ResultItem) items.elementAt(index)).frequency)))) {
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137 | index++;
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138 | }
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139 | items.insertElementAt(item,index);
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140 | numberOfItems++;
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141 | return true;
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142 | }
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143 |
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144 |
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145 | // Update more phrases/documents/links markers
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146 | void updateMarkers() {
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147 | updateMorePhrasesMarker();
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148 | updateMoreDocumentsMarker();
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149 | updateMoreLinksMarker();
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150 | }
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151 |
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152 | // Make sure the more Phrases item only appears in the list
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153 | // if it is meant to.
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154 | void updateMorePhrasesMarker() {
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155 |
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156 | System.out.println("updateMorePhrasesMarker() ");
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157 | System.out.println("expansions retrieved = "+parent.expansionsRetrieved +" num expansions = "+parent.numberOfExpansions);
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158 | // look for a marker
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159 | boolean found = false;
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160 | int index = 0;
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161 | while (!found && (index < numberOfItems)) {
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162 | if (((ResultItem) items.elementAt(index)).isMorePhrases()) {
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163 | found = true;
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164 | } else {
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165 | index++;
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166 | }
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167 | }
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168 |
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169 | if (parent.expansionsRetrieved == parent.numberOfExpansions) {
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170 | // there should be no marker
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171 | if (found) {
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172 | items.removeElementAt(index);
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173 | numberOfItems--;
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174 | }
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175 |
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176 | } else if (parent.expansionsRetrieved < parent.numberOfExpansions) {
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177 | if (!found) {
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178 | ResultItem ri = new ResultItem(ResultItem.morePhrases);
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179 | addResultItem(ri);
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180 | }
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181 | }
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182 | }
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183 |
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184 |
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185 | // Make sure the more documents marker appears when required
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186 | void updateMoreDocumentsMarker() {
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187 |
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188 | // System.out.println("updateMoreDocumentsMarker() ");
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189 |
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190 | // look for a marker
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191 | boolean found = false;
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192 | int index = 0;
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193 | while (!found && (index < numberOfItems)) {
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194 | if (((ResultItem) items.elementAt(index)).isMoreDocuments()) {
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195 | found = true;
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196 | } else {
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197 | index++;
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198 | }
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199 | }
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200 |
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201 | if (parent.documentsRetrieved == parent.numberOfDocuments) {
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202 | // there should be no marker
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203 | if (found) {
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204 | items.removeElementAt(index);
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205 | numberOfItems--;
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206 | }
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207 |
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208 | } else if (parent.documentsRetrieved < parent.numberOfDocuments) {
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209 | // there should be a marker
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210 | if (!found) {
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211 | ResultItem ri = new ResultItem(ResultItem.moreDocuments);
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212 | addResultItem(ri);
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213 | }
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214 | }
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215 | }
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216 |
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217 |
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218 | // Make sure the more links marker appears when required
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219 | void updateMoreLinksMarker() {
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220 |
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221 | // System.out.println("updateMoreLinksMarker() ");
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222 |
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223 | // look for a marker
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224 | boolean found = false;
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225 | int index = 0;
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226 | while (!found && (index < numberOfItems)) {
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227 | if (((ResultItem) items.elementAt(index)).isMoreLinks()) {
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228 | found = true;
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229 | } else {
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230 | index++;
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231 | }
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232 | }
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233 |
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234 | if (parent.thesaurusLinksRetrieved == parent.numberOfThesaurusLinks) {
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235 | // there should be no marker
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236 | if (found) {
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237 | items.removeElementAt(index);
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238 | numberOfItems--;
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239 | }
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240 |
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241 | } else if (parent.thesaurusLinksRetrieved < parent.numberOfThesaurusLinks) {
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242 | // there should be a marker
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243 | if (!found) {
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244 | ResultItem ri = new ResultItem(ResultItem.moreLinks);
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245 | addResultItem(ri);
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246 | }
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247 | }
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248 | }
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249 |
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250 |
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251 |
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252 |
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253 |
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254 |
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255 | public void update(Graphics g) {
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256 | paint(g);
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257 | }
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258 |
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259 | public void paint(Graphics g) {
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260 |
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261 | // calculate the canvas size, margins, and spacing
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262 |
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263 | // Note: the size() method is deprecated, but getSize fails in NetScape 4
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264 | Dimension canvasSize = getSize();
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265 |
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266 | g.setFont(areaPlain);
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267 | int space = g.getFontMetrics().stringWidth(" ");
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268 | int nought = g.getFontMetrics().stringWidth("0");
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269 |
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270 | int firstColumnWidth = phind.column_1_width * nought;
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271 | int secondColumnWidth = phind.column_2_width * nought;
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272 | int columnWidth = firstColumnWidth + secondColumnWidth;
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273 |
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274 | int firstColumnLeft = canvasSize.width - columnWidth;
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275 | int secondColumnLeft = firstColumnLeft + firstColumnWidth;
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276 |
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277 | int mainLeftMargin = 0;
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278 | int mainRightMargin = firstColumnLeft;
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279 |
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280 | // the number of items that will fit on the canvas
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281 | int visible = canvasSize.height / lineSpacing;
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282 |
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283 | // calculate the first item to output
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284 | int scrollValue = scrollbar.getValue();
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285 | if (numberOfItems <= visible) {
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286 | scrollValue = 0;
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287 | } else if (scrollValue > (numberOfItems - visible)) {
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288 | scrollValue = numberOfItems - visible;
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289 | }
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290 | firstItemDisplayed = scrollValue;
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291 |
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292 | // Draw the phrase area
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293 | Color fore = phind.panel_fg;
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294 | Color back = phind.panel_bg;
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295 |
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296 |
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297 | // draw the background
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298 | if (phind.showImage) {
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299 | try {
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300 | g.drawImage(backgroundImage,
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301 | mainLeftMargin, 0, mainRightMargin, canvasSize.height,
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302 | back, null);
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303 | } catch (Exception e) {
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304 | phind.showImage = false;
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305 | System.err.println("ResultCanvas paint error: " + e);
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306 | g.setColor(back);
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307 | g.fillRect(0, 0, canvasSize.width, canvasSize.height);
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308 | }
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309 | } else {
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310 | g.setColor(back);
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311 | g.fillRect(0, 0, canvasSize.width, canvasSize.height);
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312 | }
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313 |
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314 | // If there are no phrases, output a brief explanation.
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315 | if (numberOfItems == 0) {
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316 | g.drawString("No phrases match this query.", mainLeftMargin + 10, lineSpacing);
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317 | }
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318 |
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319 | // Output each of the visible ResultItems
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320 | ResultItem result;
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321 | int tab, i, y = 0;
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322 | int center = mainLeftMargin
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323 | + ((mainRightMargin - mainLeftMargin
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324 | - g.getFontMetrics().stringWidth(parent.searchPhrase)) / 2);
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325 | int thesColumn = mainLeftMargin + firstColumnWidth
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326 | + g.getFontMetrics().stringWidth("Narrower term");
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327 |
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328 | String body, prefix, suffix;
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329 |
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330 | for (i = scrollValue;
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331 | (i < numberOfItems) && (y + lineSpacing < canvasSize.height); i++) {
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332 |
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333 | // Get the resultItem to output
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334 | result = (ResultItem) items.elementAt(i);
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335 |
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336 | // Graphics settings for drawing this line
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337 | y += lineSpacing;
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338 | g.setFont(areaPlain);
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339 |
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340 | // Highlight the selected phrase.
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341 | if (i == itemSelected) {
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342 | g.setColor(phind.highlight_bg);
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343 | g.fillRect(mainLeftMargin, y-lineSpacing+2, mainRightMargin, lineSpacing);
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344 | }
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345 |
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346 | // Draw the item
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347 |
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348 | // Draw a phrase item
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349 | if (result.isPhrase()) {
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350 | prefix = result.prefixText();
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351 | body = result.mainText();
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352 | suffix = result.suffixText();
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353 |
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354 | g.setColor(phind.expansion_fg);
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355 | g.setFont(areaPlain);
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356 | tab = center - g.getFontMetrics().stringWidth(prefix) - space;
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357 | g.drawString(prefix, tab, y);
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358 |
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359 | g.setFont(areaBold);
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360 | g.drawString(body, center, y);
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361 |
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362 | tab = center + space + g.getFontMetrics().stringWidth(body);
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363 | g.setFont(areaPlain);
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364 | g.drawString(suffix, tab, y);
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365 |
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366 | }
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367 |
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368 | // Draw a document item
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369 | else if (result.isDocument()){
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370 | body = result.mainText();
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371 |
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372 | g.setColor(phind.document_fg);
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373 | g.setFont(areaPlain);
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374 | tab = (mainRightMargin - g.getFontMetrics().stringWidth(body)) / 2;
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375 | g.drawString(body, tab, y);
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376 |
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377 | }
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378 |
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379 | // Draw a thesaurus link item
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380 | else if (result.isLink()){
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381 | prefix = result.prefixText() + ":";
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382 | body = result.mainText();
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383 | tab = thesColumn - g.getFontMetrics().stringWidth(prefix) - space;
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384 |
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385 | g.setColor(phind.thesaurus_fg);
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386 | g.setFont(areaPlain);
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387 | g.drawString(prefix, tab, y);
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388 | g.setFont(areaBold);
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389 | g.drawString(body, thesColumn, y);
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390 | }
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391 |
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392 | // Draw a "more phrases/documents/links" marker
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393 | else if (result.isMorePhrases()
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394 | || result.isMoreDocuments()
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395 | || result.isMoreLinks()){
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396 | body = result.mainText();
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397 |
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398 | if (result.isMorePhrases()) {
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399 | g.setColor(phind.expansion_bar_bg);
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400 | } else if (result.isMoreDocuments()) {
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401 | g.setColor(phind.document_bar_bg);
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402 | } else {
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403 | g.setColor(phind.thesaurus_bar_bg);
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404 | }
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405 | g.fillRect(mainLeftMargin, y-lineSpacing+2, mainRightMargin, lineSpacing);
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406 |
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407 | if (result.isMorePhrases()) {
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408 | g.setColor(phind.expansion_bar_fg);
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409 | } else if (result.isMoreDocuments()) {
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410 | g.setColor(phind.document_bar_fg);
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411 | } else {
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412 | g.setColor(phind.thesaurus_bar_fg);
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413 | }
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414 | g.setFont(areaPlain);
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415 | tab = (mainRightMargin - g.getFontMetrics().stringWidth(body)) / 2;
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416 | g.drawString(body, tab, y);
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417 | }
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418 | }
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419 |
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420 | // Draw the frequecy columns
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421 |
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422 | // column backgrounds
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423 | g.setColor(phind.column_1_bg);
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424 | g.fillRect(firstColumnLeft, 0, firstColumnWidth, canvasSize.height);
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425 | g.setColor(phind.column_2_bg);
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426 | g.fillRect(secondColumnLeft, 0, secondColumnWidth, canvasSize.height);
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427 |
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428 | // fill in the numbers
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429 | g.setColor(phind.column_1_fg);
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430 | g.setFont(areaPlain);
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431 | y = 0;
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432 | String docsText, freqText;
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433 |
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434 | for (i = scrollValue;
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435 | (i < numberOfItems) && (y + lineSpacing < canvasSize.height); i++) {
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436 |
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437 | // Get the resultItem to output
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438 | result = (ResultItem) items.elementAt(i);
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439 | docsText = result.docsText();
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440 | freqText = result.freqText();
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441 |
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442 | // Graphics settings for drawing this line
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443 | y += lineSpacing;
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444 |
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445 | // Write the document frequency
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446 | if (docsText.length() > 0) {
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447 | tab = secondColumnLeft - space - g.getFontMetrics().stringWidth(docsText);
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448 | g.drawString(docsText, tab, y);
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449 | }
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450 |
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451 | // Write the term frequency
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452 | if (freqText.length() > 0) {
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453 | tab = secondColumnLeft + secondColumnWidth
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454 | - space - g.getFontMetrics().stringWidth(freqText);
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455 | g.drawString(freqText, tab, y);
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456 | }
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457 | }
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458 |
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459 | // Adjust the scrollbar
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460 | if (visible >= numberOfItems) {
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461 | parent.disableScrollbar();
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462 | } else {
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463 | scrollbar.setValues(scrollValue, visible, 0, numberOfItems);
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464 | // Deprecated - setPageIncrement() has been replaced by
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465 | // setBlockIncrement(), but the latter doesn't work on some
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466 | // browsers. Damn.
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467 | scrollbar.setBlockIncrement(visible - 1);
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468 | //scrollbar.setPageIncrement(visible - 1);
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469 | // Deprecated - more nonsense: enable() has been replaced by
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470 | // setEnabled(true), but this doesn't work on some browsers.
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471 | scrollbar.setEnabled(true);
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472 | //scrollbar.enable();
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473 | }
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474 |
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475 |
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476 | // draw the border
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477 | if (phind.showBorder) {
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478 | g.setColor(phind.panel_fg);
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479 | g.drawRect(0,0, canvasSize.width - 1, canvasSize.height - 1);
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480 | }
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481 | }
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482 |
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483 | // handle mouse clicks in the new way. just copy gordons thing for now
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484 | public void mouseClicked(MouseEvent event) {
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485 |
|
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486 | // ignore actions that occur within 1 second of the last
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487 | Date now = new Date();
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488 | // System.out.println("Click time: " + now.toString());
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489 | if (now.getTime() < (phind.lastQueryEndTime.getTime() + 1000)) {
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490 | System.out.println("Ignoring click - too close to last query.");
|
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491 | return;
|
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492 | }
|
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493 |
|
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494 | // which Item is selected?
|
---|
495 | int rowSelected = event.getY() / lineSpacing;
|
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496 | itemSelected = rowSelected + firstItemDisplayed;
|
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497 | ResultItem item = (ResultItem) items.elementAt(itemSelected);
|
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498 |
|
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499 | if (itemSelected <= numberOfItems) {
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500 |
|
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501 | //User clicks on a phrase
|
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502 | if (item.isPhrase()) {
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503 | itemSelected = itemSelected;
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504 | update(getGraphics());
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505 | parent.lookupPhrase(item.hiddenText(), item.toString(), 2);
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506 |
|
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507 | // If meta key is held down, send query to search engine
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508 | /*if (event.metaDown() && !phind.library_address.equals("")) {
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509 | String address = phind.library_address
|
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510 | + "a=q&sa=text&c=" + phind.collection
|
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511 | + "&q=%22" + item.toString().replace(' ', '+') + "%22";
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512 | phind.displayWebPage(address, phind.searchWindowName);
|
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513 | }*/
|
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514 | }
|
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515 |
|
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516 | // Click on a thesaurus link
|
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517 | else if (item.isLink()) {
|
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518 | itemSelected = itemSelected;
|
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519 | update(getGraphics());
|
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520 | parent.lookupPhrase(item.hiddenText(), item.toString(), 2);
|
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521 |
|
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522 | // If meta key is held down, send query to search engine
|
---|
523 | /*if (event.metaDown() && !phind.library_address.equals("")) {
|
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524 | String address = phind.library_address
|
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525 | + "a=q&sa=text&c=" + phind.collection
|
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526 | + "&q=%22" + item.toString().replace(' ', '+') + "%22";
|
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527 | phind.displayWebPage(address, phind.searchWindowName);
|
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528 | }*/
|
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529 | }
|
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530 |
|
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531 | // The user clicks on a URL; display it.
|
---|
532 | else if (item.isDocument()) {
|
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533 | itemSelected = itemSelected;
|
---|
534 | update(getGraphics());
|
---|
535 |
|
---|
536 | String address = phind.library_address
|
---|
537 | + "a=d&c=" + phind.collection
|
---|
538 | + "&d=" + item.hiddenText()
|
---|
539 | + "&q=" + parent.searchPhrase.replace(' ', '+');
|
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540 |
|
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541 | phind.displayWebPage(address, phind.documentWindowName);
|
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542 | }
|
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543 |
|
---|
544 | // When the user clicks on "get more phrases" or other marker,
|
---|
545 | // we have to send a new query to the host
|
---|
546 | else if (item.isMorePhrases()){
|
---|
547 | parent.lookupPhrase(parent.searchKey, parent.searchPhrase, 3);
|
---|
548 | } else if (item.isMoreDocuments()){
|
---|
549 | parent.lookupPhrase(parent.searchKey, parent.searchPhrase, 4);
|
---|
550 | } else if (item.isMoreLinks()){
|
---|
551 | parent.lookupPhrase(parent.searchKey, parent.searchPhrase, 5);
|
---|
552 |
|
---|
553 |
|
---|
554 | }
|
---|
555 | repaint();
|
---|
556 | }
|
---|
557 | }
|
---|
558 |
|
---|
559 |
|
---|
560 | // User interaction
|
---|
561 | //
|
---|
562 | // All interaction with the ResultCanvas is therough mouse clicks, and
|
---|
563 | // is handles in this method. Note we ignore clicks that follow
|
---|
564 | // another too closely to avoid problems with slow connections.
|
---|
565 | /* public boolean processEvent(Event event) {
|
---|
566 |
|
---|
567 | if (event.id == Event.MOUSE_UP) {
|
---|
568 |
|
---|
569 | // ignore actions that occur within 1 second of the last
|
---|
570 | Date now = new Date();
|
---|
571 | // System.out.println("Click time: " + now.toString());
|
---|
572 | if (now.getTime() < (phind.lastQueryEndTime.getTime() + 1000)) {
|
---|
573 | System.out.println("Ignoring click - too close to last query.");
|
---|
574 | return true;
|
---|
575 | }
|
---|
576 |
|
---|
577 | // which Item is selected?
|
---|
578 | int rowSelected = event.y / lineSpacing;
|
---|
579 | itemSelected = rowSelected + firstItemDisplayed;
|
---|
580 | ResultItem item = (ResultItem) items.elementAt(itemSelected);
|
---|
581 |
|
---|
582 | if (itemSelected <= numberOfItems) {
|
---|
583 |
|
---|
584 | //User clicks on a phrase
|
---|
585 | if (item.isPhrase()) {
|
---|
586 | itemSelected = itemSelected;
|
---|
587 | update(getGraphics());
|
---|
588 | parent.lookupPhrase(item.hiddenText(), item.toString(), 2);
|
---|
589 |
|
---|
590 | // If meta key is held down, send query to search engine
|
---|
591 | if (event.metaDown() && !phind.library_address.equals("")) {
|
---|
592 | String address = phind.library_address
|
---|
593 | + "a=q&sa=text&c=" + phind.collection
|
---|
594 | + "&q=%22" + item.toString().replace(' ', '+') + "%22";
|
---|
595 | phind.displayWebPage(address, phind.searchWindowName);
|
---|
596 | }
|
---|
597 | }
|
---|
598 |
|
---|
599 | // Click on a thesaurus link
|
---|
600 | else if (item.isLink()) {
|
---|
601 | itemSelected = itemSelected;
|
---|
602 | update(getGraphics());
|
---|
603 | parent.lookupPhrase(item.hiddenText(), item.toString(), 2);
|
---|
604 |
|
---|
605 | // If meta key is held down, send query to search engine
|
---|
606 | if (event.metaDown() && !phind.library_address.equals("")) {
|
---|
607 | String address = phind.library_address
|
---|
608 | + "a=q&sa=text&c=" + phind.collection
|
---|
609 | + "&q=%22" + item.toString().replace(' ', '+') + "%22";
|
---|
610 | phind.displayWebPage(address, phind.searchWindowName);
|
---|
611 | }
|
---|
612 | }
|
---|
613 |
|
---|
614 | // The user clicks on a URL; display it.
|
---|
615 | else if (item.isDocument()) {
|
---|
616 | itemSelected = itemSelected;
|
---|
617 | update(getGraphics());
|
---|
618 |
|
---|
619 | String address = phind.library_address
|
---|
620 | + "a=r&c=" + phind.collection
|
---|
621 | + "&r=" + item.hiddenText()
|
---|
622 | + "&q=" + parent.searchPhrase.replace(' ', '+');
|
---|
623 |
|
---|
624 | phind.displayWebPage(address, phind.documentWindowName);
|
---|
625 | }
|
---|
626 |
|
---|
627 | // When the user clicks on "get more phrases" or other marker,
|
---|
628 | // we have to send a new query to the host
|
---|
629 | else if (item.isMorePhrases()){
|
---|
630 | parent.lookupPhrase(parent.searchKey, parent.searchPhrase, 3);
|
---|
631 | } else if (item.isMoreDocuments()){
|
---|
632 | parent.lookupPhrase(parent.searchKey, parent.searchPhrase, 4);
|
---|
633 | } else if (item.isMoreLinks()){
|
---|
634 | parent.lookupPhrase(parent.searchKey, parent.searchPhrase, 5);
|
---|
635 |
|
---|
636 |
|
---|
637 | }
|
---|
638 | repaint();
|
---|
639 | }
|
---|
640 | }
|
---|
641 | return true;
|
---|
642 | } */
|
---|
643 |
|
---|
644 | }
|
---|
645 |
|
---|
646 |
|
---|
647 |
|
---|