1 | /* |
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2 | |
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3 | Copyright 2012-2013 Adam Reichold |
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4 | |
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5 | This file is part of qpdfview. |
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6 | |
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7 | qpdfview is free software: you can redistribute it and/or modify |
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8 | it under the terms of the GNU General Public License as published by |
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9 | the Free Software Foundation, either version 2 of the License, or |
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10 | (at your option) any later version. |
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11 | |
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12 | qpdfview is distributed in the hope that it will be useful, |
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13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | GNU General Public License for more details. |
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16 | |
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17 | You should have received a copy of the GNU General Public License |
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18 | along with qpdfview. If not, see <http://www.gnu.org/licenses/>. |
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19 | |
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20 | */ |
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21 | |
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22 | #include "presentationview.h" |
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23 | |
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24 | #include <QKeyEvent> |
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25 | #include <QShortcut> |
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26 | #include <QTimer> |
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27 | |
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28 | #include "settings.h" |
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29 | #include "model.h" |
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30 | #include "pageitem.h" |
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31 | #include "documentview.h" |
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32 | |
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33 | namespace |
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34 | { |
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35 | |
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36 | using namespace qpdfview; |
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37 | |
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38 | inline void adjustScaleFactor(RenderParam& renderParam, qreal scaleFactor) |
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39 | { |
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40 | if(!qFuzzyCompare(renderParam.scaleFactor(), scaleFactor)) |
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41 | { |
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42 | renderParam.setScaleFactor(scaleFactor); |
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43 | } |
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44 | } |
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45 | |
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46 | } // anonymous |
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47 | |
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48 | namespace qpdfview |
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49 | { |
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50 | |
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51 | Settings* PresentationView::s_settings = 0; |
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52 | |
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53 | PresentationView::PresentationView(const QVector< Model::Page* >& pages, QWidget* parent) : QGraphicsView(parent), |
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54 | m_prefetchTimer(0), |
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55 | m_pages(pages), |
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56 | m_currentPage(1), |
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57 | m_past(), |
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58 | m_future(), |
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59 | m_scaleMode(FitToPageSizeMode), |
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60 | m_scaleFactor(1.0), |
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61 | m_rotation(RotateBy0), |
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62 | m_renderFlags(0), |
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63 | m_pageItems() |
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64 | { |
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65 | if(s_settings == 0) |
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66 | { |
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67 | s_settings = Settings::instance(); |
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68 | } |
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69 | |
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70 | setWindowFlags(windowFlags() | Qt::FramelessWindowHint); |
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71 | setWindowState(windowState() | Qt::WindowFullScreen); |
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72 | |
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73 | setFrameShape(QFrame::NoFrame); |
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74 | |
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75 | setAcceptDrops(false); |
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76 | setDragMode(QGraphicsView::ScrollHandDrag); |
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77 | |
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78 | setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff); |
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79 | setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff); |
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80 | |
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81 | setScene(new QGraphicsScene(this)); |
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82 | |
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83 | preparePages(); |
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84 | prepareBackground(); |
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85 | |
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86 | // prefetch |
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87 | |
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88 | m_prefetchTimer = new QTimer(this); |
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89 | m_prefetchTimer->setInterval(250); |
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90 | m_prefetchTimer->setSingleShot(true); |
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91 | |
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92 | connect(this, SIGNAL(currentPageChanged(int)), m_prefetchTimer, SLOT(start())); |
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93 | connect(this, SIGNAL(scaleModeChanged(ScaleMode)), m_prefetchTimer, SLOT(start())); |
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94 | connect(this, SIGNAL(scaleFactorChanged(qreal)), m_prefetchTimer, SLOT(start())); |
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95 | connect(this, SIGNAL(rotationChanged(Rotation)), m_prefetchTimer, SLOT(start())); |
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96 | connect(this, SIGNAL(renderFlagsChanged(qpdfview::RenderFlags)), m_prefetchTimer, SLOT(start())); |
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97 | |
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98 | connect(m_prefetchTimer, SIGNAL(timeout()), SLOT(on_prefetch_timeout())); |
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99 | |
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100 | if(s_settings->documentView().prefetch()) |
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101 | { |
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102 | m_prefetchTimer->blockSignals(false); |
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103 | m_prefetchTimer->start(); |
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104 | } |
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105 | else |
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106 | { |
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107 | m_prefetchTimer->blockSignals(true); |
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108 | m_prefetchTimer->stop(); |
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109 | } |
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110 | |
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111 | prepareScene(); |
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112 | prepareView(); |
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113 | } |
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114 | |
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115 | PresentationView::~PresentationView() |
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116 | { |
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117 | qDeleteAll(m_pageItems); |
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118 | } |
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119 | |
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120 | void PresentationView::setScaleMode(ScaleMode scaleMode) |
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121 | { |
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122 | if(m_scaleMode != scaleMode && scaleMode >= 0 && scaleMode < NumberOfScaleModes) |
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123 | { |
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124 | m_scaleMode = scaleMode; |
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125 | |
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126 | prepareScene(); |
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127 | prepareView(); |
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128 | |
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129 | emit scaleModeChanged(m_scaleMode); |
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130 | } |
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131 | } |
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132 | |
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133 | void PresentationView::setScaleFactor(qreal scaleFactor) |
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134 | { |
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135 | if(!qFuzzyCompare(m_scaleFactor, scaleFactor) |
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136 | && scaleFactor >= s_settings->documentView().minimumScaleFactor() |
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137 | && scaleFactor <= s_settings->documentView().maximumScaleFactor()) |
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138 | { |
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139 | m_scaleFactor = scaleFactor; |
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140 | |
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141 | if(m_scaleMode == ScaleFactorMode) |
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142 | { |
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143 | prepareScene(); |
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144 | prepareView(); |
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145 | } |
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146 | |
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147 | emit scaleFactorChanged(m_scaleFactor); |
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148 | } |
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149 | } |
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150 | |
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151 | void PresentationView::setRotation(Rotation rotation) |
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152 | { |
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153 | if(m_rotation != rotation) |
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154 | { |
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155 | m_rotation = rotation; |
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156 | |
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157 | prepareScene(); |
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158 | prepareView(); |
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159 | |
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160 | emit rotationChanged(m_rotation); |
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161 | } |
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162 | } |
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163 | |
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164 | void PresentationView::setRenderFlags(qpdfview::RenderFlags renderFlags) |
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165 | { |
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166 | if(m_renderFlags != renderFlags) |
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167 | { |
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168 | const qpdfview::RenderFlags changedFlags = m_renderFlags ^ renderFlags; |
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169 | |
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170 | m_renderFlags = renderFlags; |
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171 | |
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172 | prepareScene(); |
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173 | prepareView(); |
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174 | |
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175 | if(changedFlags.testFlag(InvertColors)) |
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176 | { |
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177 | prepareBackground(); |
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178 | } |
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179 | |
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180 | emit renderFlagsChanged(m_renderFlags); |
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181 | } |
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182 | } |
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183 | |
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184 | void PresentationView::show() |
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185 | { |
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186 | QWidget::show(); |
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187 | |
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188 | prepareView(); |
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189 | } |
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190 | |
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191 | void PresentationView::previousPage() |
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192 | { |
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193 | jumpToPage(m_currentPage - 1); |
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194 | } |
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195 | |
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196 | void PresentationView::nextPage() |
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197 | { |
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198 | jumpToPage(m_currentPage + 1); |
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199 | } |
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200 | |
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201 | void PresentationView::firstPage() |
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202 | { |
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203 | jumpToPage(1); |
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204 | } |
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205 | |
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206 | void PresentationView::lastPage() |
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207 | { |
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208 | jumpToPage(m_pages.count()); |
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209 | } |
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210 | |
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211 | void PresentationView::jumpToPage(int page, bool trackChange) |
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212 | { |
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213 | if(m_currentPage != page && page >= 1 && page <= m_pages.count()) |
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214 | { |
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215 | if(trackChange) |
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216 | { |
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217 | m_past.append(m_currentPage); |
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218 | } |
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219 | |
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220 | m_currentPage = page; |
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221 | |
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222 | prepareView(); |
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223 | |
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224 | emit currentPageChanged(m_currentPage, trackChange); |
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225 | } |
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226 | } |
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227 | |
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228 | void PresentationView::jumpBackward() |
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229 | { |
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230 | if(!m_past.isEmpty()) |
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231 | { |
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232 | m_future.prepend(m_currentPage); |
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233 | |
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234 | jumpToPage(m_past.takeLast(), false); |
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235 | } |
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236 | } |
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237 | |
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238 | void PresentationView::jumpForward() |
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239 | { |
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240 | if(!m_future.isEmpty()) |
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241 | { |
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242 | m_past.append(m_currentPage); |
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243 | |
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244 | jumpToPage(m_future.takeFirst(), false); |
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245 | } |
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246 | } |
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247 | |
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248 | void PresentationView::zoomIn() |
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249 | { |
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250 | if(scaleMode() != ScaleFactorMode) |
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251 | { |
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252 | const qreal currentScaleFactor = m_pageItems.at(m_currentPage - 1)->renderParam().scaleFactor(); |
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253 | |
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254 | setScaleFactor(qMin(currentScaleFactor * s_settings->documentView().zoomFactor(), |
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255 | s_settings->documentView().maximumScaleFactor())); |
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256 | |
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257 | setScaleMode(ScaleFactorMode); |
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258 | } |
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259 | else |
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260 | { |
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261 | setScaleFactor(qMin(m_scaleFactor * s_settings->documentView().zoomFactor(), |
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262 | s_settings->documentView().maximumScaleFactor())); |
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263 | } |
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264 | } |
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265 | |
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266 | void PresentationView::zoomOut() |
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267 | { |
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268 | if(scaleMode() != ScaleFactorMode) |
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269 | { |
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270 | const qreal currentScaleFactor = m_pageItems.at(m_currentPage - 1)->renderParam().scaleFactor(); |
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271 | |
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272 | setScaleFactor(qMax(currentScaleFactor / s_settings->documentView().zoomFactor(), |
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273 | s_settings->documentView().minimumScaleFactor())); |
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274 | |
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275 | setScaleMode(ScaleFactorMode); |
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276 | } |
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277 | else |
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278 | { |
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279 | setScaleFactor(qMax(m_scaleFactor / s_settings->documentView().zoomFactor(), |
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280 | s_settings->documentView().minimumScaleFactor())); |
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281 | } |
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282 | } |
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283 | |
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284 | void PresentationView::originalSize() |
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285 | { |
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286 | setScaleFactor(1.0); |
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287 | setScaleMode(ScaleFactorMode); |
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288 | } |
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289 | |
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290 | void PresentationView::rotateLeft() |
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291 | { |
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292 | switch(m_rotation) |
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293 | { |
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294 | default: |
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295 | case RotateBy0: |
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296 | setRotation(RotateBy270); |
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297 | break; |
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298 | case RotateBy90: |
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299 | setRotation(RotateBy0); |
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300 | break; |
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301 | case RotateBy180: |
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302 | setRotation(RotateBy90); |
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303 | break; |
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304 | case RotateBy270: |
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305 | setRotation(RotateBy180); |
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306 | break; |
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307 | } |
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308 | } |
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309 | |
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310 | void PresentationView::rotateRight() |
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311 | { |
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312 | switch(m_rotation) |
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313 | { |
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314 | default: |
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315 | case RotateBy0: |
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316 | setRotation(RotateBy90); |
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317 | break; |
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318 | case RotateBy90: |
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319 | setRotation(RotateBy180); |
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320 | break; |
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321 | case RotateBy180: |
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322 | setRotation(RotateBy270); |
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323 | break; |
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324 | case RotateBy270: |
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325 | setRotation(RotateBy0); |
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326 | break; |
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327 | } |
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328 | } |
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329 | |
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330 | void PresentationView::on_prefetch_timeout() |
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331 | { |
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332 | int fromPage = m_currentPage, toPage = m_currentPage; |
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333 | |
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334 | fromPage -= s_settings->documentView().prefetchDistance() / 2; |
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335 | toPage += s_settings->documentView().prefetchDistance(); |
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336 | |
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337 | fromPage = qMax(fromPage, 1); |
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338 | toPage = qMin(toPage, m_pages.count()); |
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339 | |
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340 | const int maxCost = toPage - fromPage + 1; |
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341 | int cost = 0; |
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342 | |
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343 | for(int index = m_currentPage - 1; index <= toPage - 1; ++index) |
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344 | { |
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345 | cost += m_pageItems.at(index)->startRender(true); |
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346 | |
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347 | if(cost >= maxCost) |
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348 | { |
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349 | return; |
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350 | } |
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351 | } |
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352 | |
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353 | for(int index = m_currentPage - 1; index >= fromPage - 1; --index) |
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354 | { |
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355 | cost += m_pageItems.at(index)->startRender(true); |
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356 | |
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357 | if(cost >= maxCost) |
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358 | { |
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359 | return; |
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360 | } |
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361 | } |
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362 | } |
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363 | |
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364 | void PresentationView::on_pages_cropRectChanged() |
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365 | { |
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366 | prepareScene(); |
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367 | prepareView(); |
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368 | } |
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369 | |
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370 | void PresentationView::on_pages_linkClicked(bool newTab, int page, qreal left, qreal top) |
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371 | { |
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372 | Q_UNUSED(newTab); |
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373 | Q_UNUSED(left); |
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374 | Q_UNUSED(top); |
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375 | |
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376 | page = qMax(page, 1); |
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377 | page = qMin(page, m_pages.count()); |
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378 | |
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379 | jumpToPage(page, true); |
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380 | } |
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381 | |
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382 | void PresentationView::resizeEvent(QResizeEvent* event) |
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383 | { |
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384 | QGraphicsView::resizeEvent(event); |
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385 | |
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386 | prepareScene(); |
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387 | prepareView(); |
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388 | } |
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389 | |
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390 | void PresentationView::keyPressEvent(QKeyEvent* event) |
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391 | { |
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392 | switch(event->modifiers() + event->key()) |
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393 | { |
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394 | case Qt::Key_PageUp: |
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395 | case Qt::Key_Up: |
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396 | case Qt::Key_Left: |
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397 | case Qt::Key_Backspace: |
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398 | previousPage(); |
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399 | |
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400 | event->accept(); |
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401 | return; |
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402 | case Qt::Key_PageDown: |
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403 | case Qt::Key_Down: |
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404 | case Qt::Key_Right: |
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405 | case Qt::Key_Space: |
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406 | nextPage(); |
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407 | |
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408 | event->accept(); |
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409 | return; |
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410 | case Qt::Key_Home: |
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411 | firstPage(); |
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412 | |
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413 | event->accept(); |
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414 | return; |
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415 | case Qt::Key_End: |
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416 | lastPage(); |
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417 | |
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418 | event->accept(); |
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419 | return; |
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420 | case Qt::CTRL + Qt::Key_Return: |
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421 | jumpBackward(); |
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422 | |
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423 | event->accept(); |
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424 | return; |
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425 | case Qt::CTRL + Qt::SHIFT + Qt::Key_Return: |
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426 | jumpForward(); |
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427 | |
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428 | event->accept(); |
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429 | return; |
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430 | case Qt::CTRL + Qt::Key_0: |
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431 | originalSize(); |
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432 | |
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433 | event->accept(); |
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434 | return; |
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435 | case Qt::CTRL + Qt::Key_9: |
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436 | setScaleMode(FitToPageWidthMode); |
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437 | |
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438 | event->accept(); |
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439 | return; |
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440 | case Qt::CTRL + Qt::Key_8: |
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441 | setScaleMode(FitToPageSizeMode); |
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442 | |
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443 | event->accept(); |
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444 | return; |
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445 | case Qt::CTRL + Qt::Key_Up: |
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446 | zoomIn(); |
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447 | |
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448 | event->accept(); |
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449 | return; |
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450 | case Qt::CTRL + Qt::Key_Down: |
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451 | zoomOut(); |
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452 | |
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453 | event->accept(); |
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454 | return; |
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455 | case Qt::CTRL + Qt::Key_Left: |
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456 | rotateLeft(); |
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457 | |
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458 | event->accept(); |
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459 | return; |
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460 | case Qt::CTRL + Qt::Key_Right: |
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461 | rotateRight(); |
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462 | |
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463 | event->accept(); |
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464 | return; |
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465 | case Qt::CTRL + Qt::Key_I: |
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466 | setRenderFlags(renderFlags() ^ InvertColors); |
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467 | |
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468 | event->accept(); |
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469 | return; |
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470 | case Qt::CTRL + Qt::Key_U: |
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471 | setRenderFlags(renderFlags() ^ ConvertToGrayscale); |
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472 | |
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473 | event->accept(); |
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474 | return; |
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475 | case Qt::CTRL + Qt::SHIFT + Qt::Key_U: |
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476 | setRenderFlags(renderFlags() ^ TrimMargins); |
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477 | |
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478 | event->accept(); |
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479 | return; |
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480 | case Qt::Key_F12: |
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481 | case Qt::Key_Escape: |
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482 | close(); |
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483 | |
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484 | event->accept(); |
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485 | return; |
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486 | } |
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487 | |
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488 | QWidget::keyPressEvent(event); |
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489 | } |
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490 | |
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491 | void PresentationView::wheelEvent(QWheelEvent* event) |
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492 | { |
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493 | if(event->modifiers() == s_settings->documentView().zoomModifiers()) |
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494 | { |
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495 | if(event->delta() > 0) |
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496 | { |
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497 | zoomIn(); |
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498 | } |
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499 | else |
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500 | { |
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501 | zoomOut(); |
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502 | } |
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503 | |
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504 | event->accept(); |
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505 | return; |
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506 | } |
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507 | else if(event->modifiers() == s_settings->documentView().rotateModifiers()) |
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508 | { |
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509 | if(event->delta() > 0) |
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510 | { |
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511 | rotateLeft(); |
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512 | } |
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513 | else |
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514 | { |
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515 | rotateRight(); |
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516 | } |
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517 | |
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518 | event->accept(); |
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519 | return; |
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520 | } |
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521 | else if(event->modifiers() == Qt::NoModifier) |
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522 | { |
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523 | if(event->delta() > 0 && m_currentPage != 1) |
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524 | { |
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525 | previousPage(); |
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526 | |
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527 | event->accept(); |
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528 | return; |
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529 | } |
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530 | else if(event->delta() < 0 && m_currentPage != m_pages.count()) |
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531 | { |
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532 | nextPage(); |
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533 | |
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534 | event->accept(); |
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535 | return; |
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536 | } |
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537 | } |
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538 | |
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539 | QGraphicsView::wheelEvent(event); |
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540 | } |
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541 | |
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542 | void PresentationView::preparePages() |
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543 | { |
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544 | for(int index = 0; index < m_pages.count(); ++index) |
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545 | { |
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546 | PageItem* page = new PageItem(m_pages.at(index), index, PageItem::PresentationMode); |
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547 | |
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548 | scene()->addItem(page); |
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549 | m_pageItems.append(page); |
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550 | |
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551 | connect(page, SIGNAL(cropRectChanged()), SLOT(on_pages_cropRectChanged())); |
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552 | |
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553 | connect(page, SIGNAL(linkClicked(bool,int,qreal,qreal)), SLOT(on_pages_linkClicked(bool,int,qreal,qreal))); |
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554 | } |
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555 | } |
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556 | |
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557 | void PresentationView::prepareBackground() |
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558 | { |
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559 | QColor backgroundColor = s_settings->presentationView().backgroundColor(); |
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560 | |
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561 | if(!backgroundColor.isValid()) |
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562 | { |
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563 | backgroundColor = s_settings->pageItem().paperColor(); |
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564 | } |
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565 | |
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566 | if(m_renderFlags.testFlag(InvertColors)) |
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567 | { |
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568 | backgroundColor.setRgb(~backgroundColor.rgb()); |
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569 | } |
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570 | |
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571 | scene()->setBackgroundBrush(QBrush(backgroundColor)); |
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572 | } |
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573 | |
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574 | void PresentationView::prepareScene() |
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575 | { |
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576 | RenderParam renderParam(logicalDpiX(), logicalDpiY(), 1.0, |
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577 | scaleFactor(), rotation(), renderFlags()); |
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578 | |
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579 | #if QT_VERSION >= QT_VERSION_CHECK(5,1,0) |
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580 | |
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581 | if(s_settings->pageItem().useDevicePixelRatio()) |
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582 | { |
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583 | renderParam.setDevicePixelRatio(devicePixelRatio()); |
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584 | } |
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585 | |
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586 | #endif // QT_VERSION |
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587 | |
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588 | const qreal visibleWidth = viewport()->width(); |
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589 | const qreal visibleHeight = viewport()->height(); |
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590 | |
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591 | foreach(PageItem* page, m_pageItems) |
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592 | { |
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593 | const QSizeF displayedSize = page->displayedSize(renderParam); |
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594 | |
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595 | if(m_scaleMode == FitToPageWidthMode) |
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596 | { |
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597 | adjustScaleFactor(renderParam, visibleWidth / displayedSize.width()); |
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598 | } |
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599 | else if(m_scaleMode == FitToPageSizeMode) |
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600 | { |
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601 | adjustScaleFactor(renderParam, qMin(visibleWidth / displayedSize.width(), visibleHeight / displayedSize.height())); |
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602 | } |
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603 | |
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604 | page->setRenderParam(renderParam); |
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605 | } |
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606 | } |
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607 | |
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608 | void PresentationView::prepareView() |
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609 | { |
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610 | for(int index = 0; index < m_pageItems.count(); ++index) |
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611 | { |
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612 | PageItem* page = m_pageItems.at(index); |
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613 | |
---|
614 | if(index == m_currentPage - 1) |
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615 | { |
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616 | page->setVisible(true); |
---|
617 | |
---|
618 | setSceneRect(page->boundingRect().translated(page->pos())); |
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619 | } |
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620 | else |
---|
621 | { |
---|
622 | page->setVisible(false); |
---|
623 | |
---|
624 | page->cancelRender(); |
---|
625 | } |
---|
626 | |
---|
627 | } |
---|
628 | |
---|
629 | viewport()->update(); |
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630 | } |
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631 | |
---|
632 | } // qpdfview |
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