1 | /* |
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2 | |
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3 | Copyright 2014 S. Razi Alavizadeh |
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4 | Copyright 2014-2015 Adam Reichold |
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5 | |
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6 | This file is part of qpdfview. |
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7 | |
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8 | qpdfview is free software: you can redistribute it and/or modify |
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9 | it under the terms of the GNU General Public License as published by |
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10 | the Free Software Foundation, either version 2 of the License, or |
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11 | (at your option) any later version. |
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12 | |
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13 | qpdfview is distributed in the hope that it will be useful, |
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14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | GNU General Public License for more details. |
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17 | |
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18 | You should have received a copy of the GNU General Public License |
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19 | along with qpdfview. If not, see <http://www.gnu.org/licenses/>. |
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20 | |
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21 | */ |
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22 | |
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23 | #include "searchmodel.h" |
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24 | |
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25 | #include <QApplication> |
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26 | #include <QtConcurrentRun> |
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27 | |
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28 | #include "documentview.h" |
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29 | |
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30 | static inline bool operator<(int page, const QPair< int, QRectF >& result) { return page < result.first; } |
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31 | static inline bool operator<(const QPair< int, QRectF >& result, int page) { return result.first < page; } |
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32 | |
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33 | namespace qpdfview |
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34 | { |
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35 | |
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36 | SearchModel* SearchModel::s_instance = 0; |
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37 | |
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38 | SearchModel* SearchModel::instance() |
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39 | { |
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40 | if(s_instance == 0) |
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41 | { |
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42 | s_instance = new SearchModel(qApp); |
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43 | } |
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44 | |
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45 | return s_instance; |
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46 | } |
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47 | |
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48 | SearchModel::~SearchModel() |
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49 | { |
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50 | foreach(TextWatcher* watcher, m_textWatchers) |
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51 | { |
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52 | watcher->waitForFinished(); |
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53 | watcher->deleteLater(); |
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54 | } |
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55 | |
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56 | qDeleteAll(m_results); |
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57 | |
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58 | s_instance = 0; |
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59 | } |
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60 | |
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61 | QModelIndex SearchModel::index(int row, int column, const QModelIndex& parent) const |
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62 | { |
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63 | if(hasIndex(row, column, parent)) |
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64 | { |
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65 | if(!parent.isValid()) |
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66 | { |
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67 | return createIndex(row, column); |
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68 | } |
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69 | else |
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70 | { |
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71 | DocumentView* view = m_views.value(parent.row(), 0); |
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72 | |
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73 | return createIndex(row, column, view); |
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74 | } |
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75 | } |
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76 | |
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77 | return QModelIndex(); |
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78 | } |
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79 | |
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80 | QModelIndex SearchModel::parent(const QModelIndex& child) const |
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81 | { |
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82 | if(child.internalPointer() != 0) |
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83 | { |
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84 | DocumentView* view = static_cast< DocumentView* >(child.internalPointer()); |
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85 | |
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86 | return findView(view); |
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87 | } |
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88 | |
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89 | return QModelIndex(); |
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90 | } |
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91 | |
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92 | int SearchModel::rowCount(const QModelIndex& parent) const |
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93 | { |
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94 | if(!parent.isValid()) |
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95 | { |
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96 | return m_views.count(); |
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97 | } |
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98 | else |
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99 | { |
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100 | if(parent.internalPointer() == 0) |
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101 | { |
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102 | DocumentView* view = m_views.value(parent.row(), 0); |
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103 | const Results* results = m_results.value(view, 0); |
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104 | |
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105 | if(results != 0) |
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106 | { |
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107 | return results->count(); |
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108 | } |
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109 | } |
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110 | } |
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111 | |
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112 | return 0; |
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113 | } |
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114 | |
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115 | int SearchModel::columnCount(const QModelIndex&) const |
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116 | { |
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117 | return 1; |
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118 | } |
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119 | |
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120 | QVariant SearchModel::data(const QModelIndex& index, int role) const |
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121 | { |
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122 | if(!index.isValid()) |
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123 | { |
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124 | return QVariant(); |
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125 | } |
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126 | |
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127 | if(index.internalPointer() == 0) |
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128 | { |
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129 | DocumentView* view = m_views.value(index.row(), 0); |
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130 | const Results* results = m_results.value(view, 0); |
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131 | |
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132 | if(results == 0) |
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133 | { |
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134 | return QVariant(); |
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135 | } |
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136 | |
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137 | switch(role) |
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138 | { |
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139 | default: |
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140 | return QVariant(); |
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141 | case CountRole: |
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142 | return results->count(); |
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143 | case ProgressRole: |
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144 | return view->searchProgress(); |
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145 | case Qt::DisplayRole: |
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146 | return view->title(); |
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147 | case Qt::ToolTipRole: |
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148 | return tr("<b>%1</b> occurrences").arg(results->count()); |
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149 | } |
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150 | } |
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151 | else |
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152 | { |
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153 | DocumentView* view = static_cast< DocumentView* >(index.internalPointer()); |
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154 | const Results* results = m_results.value(view, 0); |
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155 | |
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156 | if(results == 0 || index.row() >= results->count()) |
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157 | { |
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158 | return QVariant(); |
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159 | } |
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160 | |
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161 | const Result& result = results->at(index.row()); |
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162 | |
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163 | switch(role) |
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164 | { |
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165 | default: |
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166 | return QVariant(); |
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167 | case PageRole: |
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168 | return result.first; |
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169 | case RectRole: |
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170 | return result.second; |
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171 | case TextRole: |
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172 | return view->searchText(); |
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173 | case MatchCaseRole: |
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174 | return view->searchMatchCase(); |
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175 | case WholeWordsRole: |
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176 | return view->searchWholeWords(); |
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177 | case MatchedTextRole: |
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178 | return fetchMatchedText(view, result); |
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179 | case SurroundingTextRole: |
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180 | return fetchSurroundingText(view, result); |
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181 | case Qt::ToolTipRole: |
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182 | return tr("<b>%1</b> occurrences on page <b>%2</b>").arg(numberOfResultsOnPage(view, result.first)).arg(result.first); |
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183 | } |
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184 | } |
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185 | |
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186 | return QVariant(); |
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187 | } |
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188 | |
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189 | DocumentView* SearchModel::viewForIndex(const QModelIndex& index) const |
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190 | { |
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191 | if(index.internalPointer() == 0) |
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192 | { |
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193 | return m_views.value(index.row(), 0); |
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194 | } |
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195 | else |
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196 | { |
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197 | return static_cast< DocumentView* >(index.internalPointer()); |
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198 | } |
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199 | } |
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200 | |
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201 | bool SearchModel::hasResults(DocumentView* view) const |
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202 | { |
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203 | const Results* results = m_results.value(view, 0); |
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204 | |
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205 | return results != 0 && !results->isEmpty(); |
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206 | } |
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207 | |
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208 | bool SearchModel::hasResultsOnPage(DocumentView* view, int page) const |
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209 | { |
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210 | const Results* results = m_results.value(view, 0); |
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211 | |
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212 | return results != 0 && qBinaryFind(results->begin(), results->end(), page) != results->end(); |
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213 | } |
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214 | |
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215 | int SearchModel::numberOfResultsOnPage(DocumentView* view, int page) const |
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216 | { |
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217 | const Results* results = m_results.value(view, 0); |
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218 | |
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219 | if(results == 0) |
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220 | { |
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221 | return 0; |
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222 | } |
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223 | |
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224 | const Results::const_iterator pageBegin = qLowerBound(results->constBegin(), results->constEnd(), page); |
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225 | const Results::const_iterator pageEnd = qUpperBound(pageBegin, results->constEnd(), page); |
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226 | |
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227 | return pageEnd - pageBegin; |
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228 | } |
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229 | |
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230 | QList< QRectF > SearchModel::resultsOnPage(DocumentView* view, int page) const |
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231 | { |
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232 | QList< QRectF > resultsOnPage; |
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233 | |
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234 | const Results* results = m_results.value(view, 0); |
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235 | |
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236 | if(results != 0) |
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237 | { |
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238 | const Results::const_iterator pageBegin = qLowerBound(results->constBegin(), results->constEnd(), page); |
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239 | const Results::const_iterator pageEnd = qUpperBound(pageBegin, results->constEnd(), page); |
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240 | |
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241 | for(Results::const_iterator iterator = pageBegin; iterator != pageEnd; ++iterator) |
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242 | { |
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243 | resultsOnPage.append(iterator->second); |
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244 | } |
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245 | } |
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246 | |
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247 | return resultsOnPage; |
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248 | } |
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249 | |
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250 | QPersistentModelIndex SearchModel::findResult(DocumentView* view, const QPersistentModelIndex& currentResult, int currentPage, FindDirection direction) const |
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251 | { |
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252 | const Results* results = m_results.value(view, 0); |
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253 | |
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254 | if(results == 0 || results->isEmpty()) |
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255 | { |
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256 | return QPersistentModelIndex(); |
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257 | } |
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258 | |
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259 | const int rows = results->count(); |
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260 | int row; |
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261 | |
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262 | if(currentResult.isValid()) |
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263 | { |
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264 | switch(direction) |
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265 | { |
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266 | default: |
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267 | case FindNext: |
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268 | row = (currentResult.row() + 1) % rows; |
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269 | break; |
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270 | case FindPrevious: |
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271 | row = (currentResult.row() + rows - 1) % rows; |
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272 | break; |
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273 | } |
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274 | } |
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275 | else |
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276 | { |
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277 | switch(direction) |
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278 | { |
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279 | default: |
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280 | case FindNext: |
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281 | { |
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282 | Results::const_iterator lowerBound = qLowerBound(results->constBegin(), results->constEnd(), currentPage); |
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283 | |
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284 | row = (lowerBound - results->constBegin()) % rows; |
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285 | break; |
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286 | } |
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287 | case FindPrevious: |
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288 | { |
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289 | Results::const_iterator upperBound = qUpperBound(results->constBegin(), results->constEnd(), currentPage); |
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290 | |
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291 | row = ((upperBound - results->constBegin()) + rows - 1) % rows; |
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292 | break; |
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293 | } |
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294 | } |
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295 | } |
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296 | |
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297 | return createIndex(row, 0, view); |
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298 | } |
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299 | |
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300 | void SearchModel::insertResults(DocumentView* view, int page, const QList< QRectF >& resultsOnPage) |
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301 | { |
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302 | if(resultsOnPage.isEmpty()) |
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303 | { |
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304 | return; |
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305 | } |
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306 | |
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307 | const QModelIndex parent = findOrInsertView(view); |
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308 | |
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309 | Results* results = m_results.value(view); |
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310 | |
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311 | Results::iterator at = qLowerBound(results->begin(), results->end(), page); |
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312 | const int row = at - results->begin(); |
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313 | |
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314 | beginInsertRows(parent, row, row + resultsOnPage.size() - 1); |
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315 | |
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316 | for(int index = resultsOnPage.size() - 1; index >= 0; --index) |
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317 | { |
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318 | at = results->insert(at, qMakePair(page, resultsOnPage.at(index))); |
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319 | } |
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320 | |
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321 | endInsertRows(); |
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322 | } |
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323 | |
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324 | void SearchModel::clearResults(DocumentView* view) |
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325 | { |
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326 | foreach(const TextCacheKey& key, m_textWatchers.keys()) |
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327 | { |
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328 | if(key.first == view) |
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329 | { |
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330 | TextWatcher* watcher = m_textWatchers.take(key); |
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331 | |
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332 | watcher->cancel(); |
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333 | watcher->waitForFinished(); |
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334 | watcher->deleteLater(); |
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335 | } |
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336 | } |
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337 | |
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338 | foreach(const TextCacheKey& key, m_textCache.keys()) |
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339 | { |
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340 | if(key.first == view) |
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341 | { |
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342 | m_textCache.remove(key); |
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343 | } |
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344 | } |
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345 | |
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346 | const QList< DocumentView* >::iterator at = qBinaryFind(m_views.begin(), m_views.end(), view); |
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347 | const int row = at - m_views.begin(); |
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348 | |
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349 | if(at == m_views.end()) |
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350 | { |
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351 | return; |
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352 | } |
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353 | |
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354 | beginRemoveRows(QModelIndex(), row, row); |
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355 | |
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356 | m_views.erase(at); |
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357 | delete m_results.take(view); |
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358 | |
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359 | endRemoveRows(); |
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360 | } |
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361 | |
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362 | void SearchModel::updateProgress(DocumentView* view) |
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363 | { |
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364 | QModelIndex index = findView(view); |
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365 | |
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366 | if(index.isValid()) |
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367 | { |
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368 | emit dataChanged(index, index); |
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369 | } |
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370 | } |
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371 | |
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372 | void SearchModel::on_fetchSurroundingText_finished() |
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373 | { |
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374 | TextWatcher* watcher = dynamic_cast< TextWatcher* >(sender()); |
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375 | |
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376 | if(watcher == 0 || watcher->isCanceled()) |
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377 | { |
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378 | return; |
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379 | } |
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380 | |
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381 | const TextJob job = watcher->result(); |
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382 | |
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383 | m_textWatchers.remove(job.key); |
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384 | watcher->deleteLater(); |
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385 | |
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386 | DocumentView* view = job.key.first; |
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387 | const Results* results = m_results.value(view, 0); |
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388 | |
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389 | if(results == 0) |
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390 | { |
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391 | return; |
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392 | } |
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393 | |
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394 | const int cost = job.object->first.length() + job.object->second.length(); |
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395 | |
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396 | m_textCache.insert(job.key, job.object, cost); |
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397 | |
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398 | emit dataChanged(createIndex(0, 0, view), createIndex(results->count() - 1, 0, view)); |
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399 | } |
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400 | |
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401 | SearchModel::SearchModel(QObject* parent) : QAbstractItemModel(parent), |
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402 | m_views(), |
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403 | m_results(), |
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404 | m_textCache(1 << 16), |
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405 | m_textWatchers() |
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406 | { |
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407 | } |
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408 | |
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409 | QModelIndex SearchModel::findView(DocumentView *view) const |
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410 | { |
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411 | const QList< DocumentView* >::const_iterator at = qBinaryFind(m_views.constBegin(), m_views.constEnd(), view); |
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412 | const int row = at - m_views.constBegin(); |
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413 | |
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414 | if(at == m_views.constEnd()) |
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415 | { |
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416 | return QModelIndex(); |
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417 | } |
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418 | |
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419 | return createIndex(row, 0); |
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420 | } |
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421 | |
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422 | QModelIndex SearchModel::findOrInsertView(DocumentView* view) |
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423 | { |
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424 | QList< DocumentView* >::iterator at = qBinaryFind(m_views.begin(), m_views.end(), view); |
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425 | int row = at - m_views.begin(); |
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426 | |
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427 | if(at == m_views.end()) |
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428 | { |
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429 | at = qUpperBound(m_views.begin(), m_views.end(), view); |
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430 | row = at - m_views.begin(); |
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431 | |
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432 | beginInsertRows(QModelIndex(), row, row); |
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433 | |
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434 | m_views.insert(at, view); |
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435 | m_results.insert(view, new Results); |
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436 | |
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437 | endInsertRows(); |
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438 | } |
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439 | |
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440 | return createIndex(row, 0); |
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441 | } |
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442 | |
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443 | QString SearchModel::fetchMatchedText(DocumentView* view, const SearchModel::Result& result) const |
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444 | { |
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445 | const TextCacheObject* object = fetchText(view, result); |
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446 | |
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447 | return object != 0 ? object->first : QString(); |
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448 | } |
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449 | |
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450 | QString SearchModel::fetchSurroundingText(DocumentView* view, const Result& result) const |
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451 | { |
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452 | const TextCacheObject* object = fetchText(view, result); |
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453 | |
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454 | return object != 0 ? object->second : QString(); |
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455 | } |
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456 | |
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457 | const SearchModel::TextCacheObject* SearchModel::fetchText(DocumentView* view, const SearchModel::Result& result) const |
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458 | { |
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459 | const TextCacheKey key = textCacheKey(view, result); |
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460 | |
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461 | if(const TextCacheObject* object = m_textCache.object(key)) |
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462 | { |
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463 | return object; |
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464 | } |
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465 | |
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466 | if(m_textWatchers.size() < 20 && !m_textWatchers.contains(key)) |
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467 | { |
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468 | TextWatcher* watcher = new TextWatcher(); |
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469 | m_textWatchers.insert(key, watcher); |
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470 | |
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471 | connect(watcher, SIGNAL(finished()), SLOT(on_fetchSurroundingText_finished())); |
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472 | |
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473 | watcher->setFuture(QtConcurrent::run(textJob, key, result)); |
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474 | } |
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475 | |
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476 | return 0; |
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477 | } |
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478 | |
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479 | inline SearchModel::TextCacheKey SearchModel::textCacheKey(DocumentView* view, const Result& result) |
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480 | { |
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481 | QByteArray key; |
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482 | |
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483 | QDataStream(&key, QIODevice::WriteOnly) |
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484 | << result.first |
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485 | << result.second; |
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486 | |
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487 | return qMakePair(view, key); |
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488 | } |
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489 | |
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490 | SearchModel::TextJob SearchModel::textJob(const TextCacheKey& key, const Result& result) |
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491 | { |
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492 | const QPair< QString, QString >& text = key.first->searchContext(result.first, result.second); |
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493 | |
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494 | return TextJob(key, new TextCacheObject(text)); |
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495 | } |
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496 | |
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497 | } // qpdfview |
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