[1f4adec] | 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 | |
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| 614 | if(index == m_currentPage - 1) |
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| 615 | { |
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| 616 | page->setVisible(true); |
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| 617 | |
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| 618 | setSceneRect(page->boundingRect().translated(page->pos())); |
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| 619 | } |
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| 620 | else |
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| 621 | { |
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| 622 | page->setVisible(false); |
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| 623 | |
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| 624 | page->cancelRender(); |
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| 625 | } |
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| 626 | |
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| 627 | } |
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| 628 | |
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| 629 | viewport()->update(); |
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| 630 | } |
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| 631 | |
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| 632 | } // qpdfview |
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