[e0e368b] | 1 | /* |
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| 2 | |
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| 3 | Copyright 2014 S. Razi Alavizadeh |
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| 4 | Copyright 2013-2014 Adam Reichold |
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| 5 | |
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| 6 | This file is part of qpdfview. |
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| 7 | |
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| 8 | qpdfview is free software: you can redistribute it and/or modify |
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| 9 | it under the terms of the GNU General Public License as published by |
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| 10 | the Free Software Foundation, either version 2 of the License, or |
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| 11 | (at your option) any later version. |
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| 12 | |
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| 13 | qpdfview is distributed in the hope that it will be useful, |
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| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 16 | GNU General Public License for more details. |
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| 17 | |
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| 18 | You should have received a copy of the GNU General Public License |
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| 19 | along with qpdfview. If not, see <http://www.gnu.org/licenses/>. |
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| 20 | |
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| 21 | */ |
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| 22 | |
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| 23 | #include "documentlayout.h" |
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| 24 | |
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| 25 | #include "settings.h" |
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| 26 | #include "pageitem.h" |
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| 27 | |
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| 28 | namespace |
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| 29 | { |
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| 30 | |
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| 31 | using namespace qpdfview; |
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| 32 | |
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| 33 | const qreal viewportPadding = 6.0f; |
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| 34 | |
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| 35 | } // anonymous |
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| 36 | |
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| 37 | namespace qpdfview |
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| 38 | { |
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| 39 | |
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| 40 | Settings* DocumentLayout::s_settings = 0; |
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| 41 | |
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| 42 | DocumentLayout::DocumentLayout() |
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| 43 | { |
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| 44 | if(s_settings == 0) |
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| 45 | { |
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| 46 | s_settings = Settings::instance(); |
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| 47 | } |
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| 48 | } |
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| 49 | |
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| 50 | DocumentLayout* DocumentLayout::fromLayoutMode(LayoutMode layoutMode) |
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| 51 | { |
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| 52 | switch(layoutMode) |
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| 53 | { |
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| 54 | default: |
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| 55 | case SinglePageMode: return new SinglePageLayout; |
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| 56 | case TwoPagesMode: return new TwoPagesLayout; |
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| 57 | case TwoPagesWithCoverPageMode: return new TwoPagesWithCoverPageLayout; |
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| 58 | case MultiplePagesMode: return new MultiplePagesLayout; |
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| 59 | } |
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| 60 | } |
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| 61 | |
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| 62 | bool DocumentLayout::isCurrentPage(const QRectF& visibleRect, const QRectF& pageRect) const |
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| 63 | { |
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| 64 | // Works with vertically scrolling layouts, i.e. all currently implemented layouts. |
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| 65 | const qreal pageVisibleHeight = pageRect.intersected(visibleRect).height(); |
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| 66 | const qreal pageTopOffset = pageRect.top() - visibleRect.top(); |
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| 67 | |
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| 68 | if(visibleRect.height() > 2.0f * pageRect.height()) // Are more than two pages visible? |
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| 69 | { |
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| 70 | const qreal halfPageHeight = 0.5f * pageRect.height(); |
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| 71 | |
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| 72 | return pageVisibleHeight >= halfPageHeight && pageTopOffset < halfPageHeight && pageTopOffset >= -halfPageHeight; |
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| 73 | } |
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| 74 | else |
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| 75 | { |
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| 76 | return pageVisibleHeight >= 0.5f * visibleRect.height(); |
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| 77 | } |
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| 78 | } |
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| 79 | |
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| 80 | qreal DocumentLayout::visibleHeight(int viewportHeight) const |
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| 81 | { |
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| 82 | const qreal pageSpacing = s_settings->documentView().pageSpacing(); |
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| 83 | |
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| 84 | return viewportHeight - 2.0f * pageSpacing; |
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| 85 | } |
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| 86 | |
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| 87 | |
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| 88 | int SinglePageLayout::currentPage(int page) const |
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| 89 | { |
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| 90 | return page; |
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| 91 | } |
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| 92 | |
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| 93 | int SinglePageLayout::previousPage(int page) const |
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| 94 | { |
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| 95 | return qMax(page - 1, 1); |
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| 96 | } |
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| 97 | |
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| 98 | int SinglePageLayout::nextPage(int page, int count) const |
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| 99 | { |
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| 100 | return qMin(page + 1, count); |
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| 101 | } |
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| 102 | |
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| 103 | QPair< int, int > SinglePageLayout::prefetchRange(int page, int count) const |
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| 104 | { |
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| 105 | const int prefetchDistance = s_settings->documentView().prefetchDistance(); |
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| 106 | |
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| 107 | return qMakePair(qMax(page - prefetchDistance / 2, 1), |
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| 108 | qMin(page + prefetchDistance, count)); |
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| 109 | } |
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| 110 | |
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| 111 | int SinglePageLayout::leftIndex(int index) const |
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| 112 | { |
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| 113 | return index; |
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| 114 | } |
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| 115 | |
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| 116 | int SinglePageLayout::rightIndex(int index, int count) const |
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| 117 | { |
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| 118 | Q_UNUSED(count); |
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| 119 | |
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| 120 | return index; |
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| 121 | } |
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| 122 | |
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| 123 | qreal SinglePageLayout::visibleWidth(int viewportWidth) const |
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| 124 | { |
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| 125 | const qreal pageSpacing = s_settings->documentView().pageSpacing(); |
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| 126 | |
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| 127 | return viewportWidth - viewportPadding - 2.0f * pageSpacing; |
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| 128 | } |
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| 129 | |
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| 130 | void SinglePageLayout::prepareLayout(const QVector< PageItem* >& pageItems, bool /* rightToLeft */, |
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| 131 | qreal& left, qreal& right, qreal& height) |
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| 132 | { |
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| 133 | const qreal pageSpacing = s_settings->documentView().pageSpacing(); |
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| 134 | qreal pageHeight = 0.0f; |
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| 135 | |
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| 136 | for(int index = 0; index < pageItems.count(); ++index) |
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| 137 | { |
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| 138 | PageItem* page = pageItems.at(index); |
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| 139 | const QRectF boundingRect = page->boundingRect(); |
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| 140 | |
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| 141 | page->setPos(-boundingRect.left() - 0.5f * boundingRect.width(), height - boundingRect.top()); |
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| 142 | |
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| 143 | pageHeight = boundingRect.height(); |
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| 144 | |
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| 145 | left = qMin(left, -0.5f * boundingRect.width() - pageSpacing); |
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| 146 | right = qMax(right, 0.5f * boundingRect.width() + pageSpacing); |
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| 147 | height += pageHeight + pageSpacing; |
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| 148 | } |
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| 149 | } |
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| 150 | |
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| 151 | |
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| 152 | int TwoPagesLayout::currentPage(int page) const |
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| 153 | { |
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| 154 | return page % 2 != 0 ? page : page - 1; |
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| 155 | } |
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| 156 | |
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| 157 | int TwoPagesLayout::previousPage(int page) const |
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| 158 | { |
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| 159 | return qMax(page - 2, 1); |
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| 160 | } |
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| 161 | |
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| 162 | int TwoPagesLayout::nextPage(int page, int count) const |
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| 163 | { |
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| 164 | return qMin(page + 2, count); |
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| 165 | } |
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| 166 | |
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| 167 | QPair< int, int > TwoPagesLayout::prefetchRange(int page, int count) const |
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| 168 | { |
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| 169 | const int prefetchDistance = s_settings->documentView().prefetchDistance(); |
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| 170 | |
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| 171 | return qMakePair(qMax(page - prefetchDistance, 1), |
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| 172 | qMin(page + 2 * prefetchDistance + 1, count)); |
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| 173 | } |
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| 174 | |
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| 175 | int TwoPagesLayout::leftIndex(int index) const |
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| 176 | { |
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| 177 | return index % 2 == 0 ? index : index - 1; |
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| 178 | } |
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| 179 | |
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| 180 | int TwoPagesLayout::rightIndex(int index, int count) const |
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| 181 | { |
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| 182 | return qMin(index % 2 == 0 ? index + 1 : index, count - 1); |
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| 183 | } |
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| 184 | |
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| 185 | qreal TwoPagesLayout::visibleWidth(int viewportWidth) const |
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| 186 | { |
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| 187 | const qreal pageSpacing = s_settings->documentView().pageSpacing(); |
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| 188 | |
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| 189 | return (viewportWidth - viewportPadding - 3.0f * pageSpacing) / 2.0f; |
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| 190 | } |
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| 191 | |
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| 192 | void TwoPagesLayout::prepareLayout(const QVector< PageItem* >& pageItems, bool rightToLeft, |
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| 193 | qreal& left, qreal& right, qreal& height) |
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| 194 | { |
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| 195 | const qreal pageSpacing = s_settings->documentView().pageSpacing(); |
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| 196 | qreal pageHeight = 0.0f; |
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| 197 | |
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| 198 | for(int index = 0; index < pageItems.count(); ++index) |
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| 199 | { |
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| 200 | PageItem* page = pageItems.at(index); |
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| 201 | const QRectF boundingRect = page->boundingRect(); |
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| 202 | |
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| 203 | const qreal leftPos = -boundingRect.left() - boundingRect.width() - 0.5f * pageSpacing; |
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| 204 | const qreal rightPos = -boundingRect.left() + 0.5f * pageSpacing; |
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| 205 | |
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| 206 | if(index == leftIndex(index)) |
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| 207 | { |
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| 208 | page->setPos(rightToLeft ? rightPos : leftPos, height - boundingRect.top()); |
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| 209 | |
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| 210 | pageHeight = boundingRect.height(); |
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| 211 | |
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| 212 | if(rightToLeft) |
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| 213 | { |
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| 214 | right = qMax(right, boundingRect.width() + 1.5f * pageSpacing); |
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| 215 | } |
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| 216 | else |
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| 217 | { |
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| 218 | left = qMin(left, -boundingRect.width() - 1.5f * pageSpacing); |
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| 219 | } |
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| 220 | |
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| 221 | if(index == rightIndex(index, pageItems.count())) |
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| 222 | { |
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| 223 | right = qMax(right, 0.5f * pageSpacing); |
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| 224 | height += pageHeight + pageSpacing; |
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| 225 | } |
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| 226 | } |
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| 227 | else |
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| 228 | { |
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| 229 | page->setPos(rightToLeft ? leftPos : rightPos, height - boundingRect.top()); |
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| 230 | |
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| 231 | pageHeight = qMax(pageHeight, boundingRect.height()); |
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| 232 | |
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| 233 | if(rightToLeft) |
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| 234 | { |
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| 235 | left = qMin(left, -boundingRect.width() - 1.5f * pageSpacing); |
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| 236 | } |
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| 237 | else |
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| 238 | { |
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| 239 | right = qMax(right, boundingRect.width() + 1.5f * pageSpacing); |
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| 240 | } |
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| 241 | |
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| 242 | height += pageHeight + pageSpacing; |
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| 243 | } |
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| 244 | } |
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| 245 | } |
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| 246 | |
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| 247 | |
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| 248 | int TwoPagesWithCoverPageLayout::currentPage(int page) const |
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| 249 | { |
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| 250 | return page == 1 ? page : (page % 2 == 0 ? page : page - 1); |
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| 251 | } |
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| 252 | |
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| 253 | int TwoPagesWithCoverPageLayout::leftIndex(int index) const |
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| 254 | { |
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| 255 | return index == 0 ? index : (index % 2 != 0 ? index : index - 1); |
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| 256 | } |
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| 257 | |
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| 258 | int TwoPagesWithCoverPageLayout::rightIndex(int index, int count) const |
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| 259 | { |
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| 260 | return qMin(index % 2 != 0 ? index + 1 : index, count - 1); |
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| 261 | } |
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| 262 | |
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| 263 | |
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| 264 | int MultiplePagesLayout::currentPage(int page) const |
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| 265 | { |
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| 266 | const int pagesPerRow = s_settings->documentView().pagesPerRow(); |
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| 267 | |
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| 268 | return page - ((page - 1) % pagesPerRow); |
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| 269 | } |
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| 270 | |
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| 271 | int MultiplePagesLayout::previousPage(int page) const |
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| 272 | { |
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| 273 | const int pagesPerRow = s_settings->documentView().pagesPerRow(); |
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| 274 | |
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| 275 | return qMax(page - pagesPerRow, 1); |
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| 276 | } |
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| 277 | |
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| 278 | int MultiplePagesLayout::nextPage(int page, int count) const |
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| 279 | { |
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| 280 | const int pagesPerRow = s_settings->documentView().pagesPerRow(); |
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| 281 | |
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| 282 | return qMin(page + pagesPerRow, count); |
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| 283 | } |
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| 284 | |
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| 285 | QPair<int, int> MultiplePagesLayout::prefetchRange(int page, int count) const |
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| 286 | { |
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| 287 | const int prefetchDistance = s_settings->documentView().prefetchDistance(); |
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| 288 | const int pagesPerRow = s_settings->documentView().pagesPerRow(); |
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| 289 | |
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| 290 | return qMakePair(qMax(page - pagesPerRow * (prefetchDistance / 2), 1), |
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| 291 | qMin(page + pagesPerRow * (prefetchDistance + 1) - 1, count)); |
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| 292 | } |
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| 293 | |
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| 294 | int MultiplePagesLayout::leftIndex(int index) const |
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| 295 | { |
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| 296 | const int pagesPerRow = s_settings->documentView().pagesPerRow(); |
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| 297 | |
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| 298 | return index - (index % pagesPerRow); |
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| 299 | } |
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| 300 | |
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| 301 | int MultiplePagesLayout::rightIndex(int index, int count) const |
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| 302 | { |
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| 303 | const int pagesPerRow = s_settings->documentView().pagesPerRow(); |
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| 304 | |
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| 305 | return qMin(index - (index % pagesPerRow) + pagesPerRow - 1, count - 1); |
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| 306 | } |
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| 307 | |
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| 308 | qreal MultiplePagesLayout::visibleWidth(int viewportWidth) const |
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| 309 | { |
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| 310 | const qreal pageSpacing = s_settings->documentView().pageSpacing(); |
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| 311 | const int pagesPerRow = s_settings->documentView().pagesPerRow(); |
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| 312 | |
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| 313 | return (viewportWidth - viewportPadding - (pagesPerRow + 1) * pageSpacing) / pagesPerRow; |
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| 314 | } |
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| 315 | |
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| 316 | void MultiplePagesLayout::prepareLayout(const QVector< PageItem* >& pageItems, bool rightToLeft, |
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| 317 | qreal& left, qreal& right, qreal& height) |
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| 318 | { |
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| 319 | const qreal pageSpacing = s_settings->documentView().pageSpacing(); |
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| 320 | qreal pageHeight = 0.0; |
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| 321 | |
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| 322 | for(int index = 0; index < pageItems.count(); ++index) |
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| 323 | { |
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| 324 | PageItem* page = pageItems.at(index); |
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| 325 | const QRectF boundingRect = page->boundingRect(); |
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| 326 | |
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| 327 | const qreal leftPos = left - boundingRect.left() + pageSpacing; |
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| 328 | const qreal rightPos = right - boundingRect.left() - boundingRect.width() - pageSpacing; |
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| 329 | |
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| 330 | page->setPos(rightToLeft ? rightPos : leftPos, height - boundingRect.top()); |
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| 331 | |
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| 332 | pageHeight = qMax(pageHeight, boundingRect.height()); |
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| 333 | |
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| 334 | if(rightToLeft) |
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| 335 | { |
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| 336 | right -= boundingRect.width() + pageSpacing; |
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| 337 | } |
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| 338 | else |
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| 339 | { |
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| 340 | left += boundingRect.width() + pageSpacing; |
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| 341 | } |
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| 342 | |
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| 343 | if(index == rightIndex(index, pageItems.count())) |
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| 344 | { |
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| 345 | height += pageHeight + pageSpacing; |
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| 346 | pageHeight = 0.0f; |
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| 347 | |
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| 348 | if(rightToLeft) |
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| 349 | { |
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| 350 | left = qMin(left, right - pageSpacing); |
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| 351 | right = 0.0f; |
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| 352 | } |
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| 353 | else |
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| 354 | { |
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| 355 | right = qMax(right, left + pageSpacing); |
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| 356 | left = 0.0f; |
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| 357 | } |
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| 358 | } |
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| 359 | } |
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| 360 | } |
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| 361 | |
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| 362 | } // qpdfview |
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