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1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
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2
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3 /*
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4 EasyMercurial
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5
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6 Based on HgExplorer by Jari Korhonen
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7 Copyright (c) 2010 Jari Korhonen
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8 Copyright (c) 2010 Chris Cannam
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9 Copyright (c) 2010 Queen Mary, University of London
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10
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11 This program is free software; you can redistribute it and/or
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12 modify it under the terms of the GNU General Public License as
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13 published by the Free Software Foundation; either version 2 of the
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14 License, or (at your option) any later version. See the file
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15 COPYING included with this distribution for more information.
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16 */
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17
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18 #include "panner.h"
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19 #include "panned.h"
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20
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21 #include <QPolygon>
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22 #include <QMouseEvent>
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23 #include <QColor>
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24
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25 #include <iostream>
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26
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27 class PannerScene : public QGraphicsScene
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28 {
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29 public:
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30 friend class Panner;
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31 };
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32
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33 Panner::Panner() :
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34 m_clicked(false)
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35 {
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36 setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
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37 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
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38 setOptimizationFlags(QGraphicsView::DontSavePainterState |
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39 QGraphicsView::IndirectPainting);
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40 setMouseTracking(true);
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41 setInteractive(false);
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42 }
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43
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44 void
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45 Panner::setScene(QGraphicsScene *s)
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46 {
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47 if (scene()) {
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48 disconnect(scene(), SIGNAL(sceneRectChanged(const QRectF &)),
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49 this, SLOT(slotSceneRectChanged(const QRectF &)));
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50 }
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51 QGraphicsView::setScene(s);
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52 if (scene()) fitInView(sceneRect(), Qt::IgnoreAspectRatio);
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53 m_cache = QPixmap();
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54 connect(scene(), SIGNAL(sceneRectChanged(const QRectF &)),
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55 this, SLOT(slotSceneRectChanged(const QRectF &)));
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56 }
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57
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58 void
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59 Panner::connectToPanned(Panned *p)
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60 {
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61 connect(p, SIGNAL(pannedRectChanged(QRectF)),
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62 this, SLOT(slotSetPannedRect(QRectF)));
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63
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64 connect(this, SIGNAL(pannedRectChanged(QRectF)),
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65 p, SLOT(slotSetPannedRect(QRectF)));
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66
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67 connect(this, SIGNAL(zoomIn()),
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68 p, SLOT(zoomIn()));
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69
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70 connect(this, SIGNAL(zoomOut()),
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71 p, SLOT(zoomOut()));
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72 }
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73
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74 void
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75 Panner::slotSetPannedRect(QRectF rect)
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76 {
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77 m_pannedRect = rect;
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78 viewport()->update();
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79 }
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80
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81 void
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82 Panner::resizeEvent(QResizeEvent *)
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83 {
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84 if (scene()) fitInView(sceneRect(), Qt::IgnoreAspectRatio);
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85 m_cache = QPixmap();
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86 }
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87
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88 void
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89 Panner::slotSceneRectChanged(const QRectF &newRect)
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90 {
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91 if (!scene()) return; // spurious
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92 fitInView(newRect, Qt::IgnoreAspectRatio);
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93 m_cache = QPixmap();
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94 viewport()->update();
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95 }
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96
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97 void
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98 Panner::paintEvent(QPaintEvent *e)
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99 {
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100 QPaintEvent *e2 = new QPaintEvent(e->region().boundingRect());
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101 QGraphicsView::paintEvent(e2);
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102
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103 QPainter paint;
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104 paint.begin(viewport());
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105 paint.setClipRegion(e->region());
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106
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107 QPainterPath path;
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108 path.addRect(rect());
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109 path.addPolygon(mapFromScene(m_pannedRect));
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110
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111 QColor c(QColor::fromHsv(211, 194, 238));
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112 c.setAlpha(80);
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113 paint.setPen(Qt::NoPen);
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114 paint.setBrush(c);
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115 paint.drawPath(path);
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116
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117 paint.setBrush(Qt::NoBrush);
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118 paint.setPen(QPen(QColor::fromHsv(211, 194, 238), 0));
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119 paint.drawConvexPolygon(mapFromScene(m_pannedRect));
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120
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121 paint.end();
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122
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123 emit pannerChanged(m_pannedRect);
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124 }
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125
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126 void
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127 Panner::updateScene(const QList<QRectF> &rects)
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128 {
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129 if (!m_cache.isNull()) m_cache = QPixmap();
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130 QGraphicsView::updateScene(rects);
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131 }
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132
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133 void
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134 Panner::drawItems(QPainter *painter, int numItems,
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135 QGraphicsItem *items[],
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136 const QStyleOptionGraphicsItem options[])
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137 {
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138 if (m_cache.size() != viewport()->size()) {
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139
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140 std::cerr << "Panner: recreating cache" << std::endl;
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141
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142 QGraphicsScene *s = scene();
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143 if (!s) return;
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144 PannerScene *ps = static_cast<PannerScene *>(s);
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145
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146 m_cache = QPixmap(viewport()->size());
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147 m_cache.fill(Qt::transparent);
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148 QPainter cachePainter;
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149 cachePainter.begin(&m_cache);
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150 cachePainter.setTransform(viewportTransform());
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151 ps->drawItems(&cachePainter, numItems, items, options);
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152 cachePainter.end();
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153 }
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154
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155 painter->save();
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156 painter->setTransform(QTransform());
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157 painter->drawPixmap(0, 0, m_cache);
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158 painter->restore();
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159 }
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160
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161 void
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162 Panner::mousePressEvent(QMouseEvent *e)
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163 {
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164 if (e->button() != Qt::LeftButton) {
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165 QGraphicsView::mouseDoubleClickEvent(e);
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166 return;
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167 }
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168 m_clicked = true;
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169 m_clickedRect = m_pannedRect;
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170 m_clickedPoint = e->pos();
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171 }
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172
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173 void
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174 Panner::mouseDoubleClickEvent(QMouseEvent *e)
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175 {
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176 if (e->button() != Qt::LeftButton) {
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177 QGraphicsView::mouseDoubleClickEvent(e);
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178 return;
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179 }
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180
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181 moveTo(e->pos());
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182 }
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183
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184 void
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185 Panner::mouseMoveEvent(QMouseEvent *e)
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186 {
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187 if (!m_clicked) return;
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188 QPointF cp = mapToScene(m_clickedPoint);
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189 QPointF mp = mapToScene(e->pos());
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190 QPointF delta = mp - cp;
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191 QRectF nr = m_clickedRect;
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192 nr.translate(delta);
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193 slotSetPannedRect(nr);
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194 emit pannedRectChanged(m_pannedRect);
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195 viewport()->update();
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196 }
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197
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198 void
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199 Panner::mouseReleaseEvent(QMouseEvent *e)
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200 {
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201 if (e->button() != Qt::LeftButton) {
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202 QGraphicsView::mouseDoubleClickEvent(e);
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203 return;
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204 }
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205
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206 if (m_clicked) {
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207 mouseMoveEvent(e);
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208 }
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209
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210 m_clicked = false;
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211 viewport()->update();
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212 }
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213
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214 void
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215 Panner::wheelEvent(QWheelEvent *e)
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216 {
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217 int d = e->delta();
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218 if (d > 0) {
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219 while (d > 0) {
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220 emit zoomOut();
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221 d -= 120;
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222 }
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223 } else {
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224 while (d < 0) {
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225 emit zoomIn();
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226 d += 120;
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227 }
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228 }
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229 }
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230
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231 void
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232 Panner::moveTo(QPoint p)
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233 {
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234 QPointF sp = mapToScene(p);
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235 QRectF nr = m_pannedRect;
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236 double d = sp.x() - nr.center().x();
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237 nr.translate(d, 0);
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238 slotSetPannedRect(nr);
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239 emit pannedRectChanged(m_pannedRect);
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240 viewport()->update();
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241 }
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242
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