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Diffstat (limited to 'examples/demos/documentviewer/pdfviewer.cpp')
| -rw-r--r-- | examples/demos/documentviewer/pdfviewer.cpp | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/examples/demos/documentviewer/pdfviewer.cpp b/examples/demos/documentviewer/pdfviewer.cpp new file mode 100644 index 00000000..b6093c0b --- /dev/null +++ b/examples/demos/documentviewer/pdfviewer.cpp @@ -0,0 +1,217 @@ +// Copyright (C) 2023 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause + +#include "pdfviewer.h" +#include "zoomselector.h" +#include "hoverwatcher.h" + +#include <QApplication> +#include <QPdfBookmarkModel> +#include <QPdfDocument> +#include <QPdfPageNavigator> +#include <QPdfPageSelector> +#include <QListView> +#include <QPdfView> +#include <QStandardPaths> +#include <QtMath> +#include <QSpinBox> +#include <QToolBar> +#include <QMainWindow> +#include <QTreeView> +#include <QListWidget> +#include <QScrollBar> +#include <QEvent> +#include <QMouseEvent> +#include <QScroller> +#ifdef QT_ABSTRACTVIEWER_PRINTSUPPORT +#include <QPrinter> +#include <QPainter> +#endif + +Q_LOGGING_CATEGORY(lcExample, "qt.examples.pdfviewer") + +PdfViewer::PdfViewer(QFile *file, QWidget *parent, QMainWindow *mainWindow) : + AbstractViewer(file, new QPdfView(parent), mainWindow), m_document(new QPdfDocument(this)) + +{ + m_pdfView = qobject_cast<QPdfView *>(widget()); + connect(this, &AbstractViewer::uiInitialized, this, &PdfViewer::initPdfViewer); +} +PdfViewer::~PdfViewer() +{ + delete m_pages; + delete m_bookmarks; + delete m_document; +} + +void PdfViewer::initPdfViewer() +{ + m_toolBar = addToolBar("PDF"); + m_zoomSelector = new ZoomSelector(m_toolBar); + m_pageSelector = new QPdfPageSelector(m_toolBar); + + m_toolBar->insertWidget(m_uiAssets.forward, m_pageSelector); + + connect(m_pageSelector, &QSpinBox::valueChanged, this, &PdfViewer::pageSelected); + connect(m_pageSelector, &QSpinBox::valueChanged, this, &PdfViewer::pageSelected); + connect(m_pdfView->pageNavigator(), &QPdfPageNavigator::backAvailableChanged, m_uiAssets.back, &QAction::setEnabled); + m_actionBack = m_uiAssets.back; + m_actionForward = m_uiAssets.forward; + connect(m_uiAssets.back, &QAction::triggered, this, &PdfViewer::onActionBackTriggered); + connect(m_uiAssets.forward, &QAction::triggered, this, &PdfViewer::onActionForwardTriggered); + + m_toolBar->addSeparator(); + m_toolBar->addWidget(m_zoomSelector); + + auto *actionZoomIn = m_toolBar->addAction("Zoom in"); + actionZoomIn->setToolTip("Increase zoom level"); + actionZoomIn->setIcon(QIcon(":/demos/documentviewer/images/zoom-in.png")); + m_toolBar->addAction(actionZoomIn); + connect(actionZoomIn, &QAction::triggered, this, &PdfViewer::onActionZoomInTriggered); + + auto *actionZoomOut = m_toolBar->addAction("Zoom out"); + actionZoomOut->setToolTip("Decrease zoom level"); + actionZoomOut->setIcon(QIcon(":/demos/documentviewer/images/zoom-out.png")); + m_toolBar->addAction(actionZoomOut); + connect(actionZoomOut, &QAction::triggered, this, &PdfViewer::onActionZoomOutTriggered); + + auto *nav = m_pdfView->pageNavigator(); + connect(nav, &QPdfPageNavigator::currentPageChanged, m_pageSelector, &QSpinBox::setValue); + connect(nav, &QPdfPageNavigator::backAvailableChanged, m_actionBack, &QAction::setEnabled); + connect(nav, &QPdfPageNavigator::forwardAvailableChanged, m_actionForward, &QAction::setEnabled); + + connect(m_zoomSelector, &ZoomSelector::zoomModeChanged, m_pdfView, &QPdfView::setZoomMode); + connect(m_zoomSelector, &ZoomSelector::zoomFactorChanged, m_pdfView, &QPdfView::setZoomFactor); + m_zoomSelector->reset(); + + QPdfBookmarkModel *bookmarkModel = new QPdfBookmarkModel(this); + bookmarkModel->setDocument(m_document); + m_uiAssets.tabs->clear(); + m_bookmarks = new QTreeView(m_uiAssets.tabs); + connect(m_bookmarks, &QAbstractItemView::activated, this, &PdfViewer::bookmarkSelected); + m_bookmarks->setModel(bookmarkModel); + m_pdfView->setDocument(m_document); + m_pdfView->setPageMode(QPdfView::PageMode::MultiPage); + + openPdfFile(); + if (!m_document->pageCount()) + return; + + m_pages = new QListView(m_uiAssets.tabs); + m_pages->setModel(m_document->pageModel()); + connect(m_pages->selectionModel(), &QItemSelectionModel::currentRowChanged, m_pages, [&] + (const QModelIndex ¤t, const QModelIndex &previous){ + if (previous == current) + return; + + auto *nav = m_pdfView->pageNavigator(); + const int &row = current.row(); + if (nav->currentPage() == row) + return; + + nav->jump(row, QPointF(), nav->currentZoom()); + }); + + connect(m_pdfView->pageNavigator(), &QPdfPageNavigator::currentPageChanged, m_pages, [&](int page){ + if (m_pages->currentIndex().row() == page) + return; + + m_pages->setCurrentIndex(m_pages->model()->index(page, 0)); + }); + + m_uiAssets.tabs->addTab(m_pages, "Pages"); + m_uiAssets.tabs->addTab(m_bookmarks, "Bookmarks"); + QScroller::grabGesture(m_pdfView->viewport(), QScroller::ScrollerGestureType::LeftMouseButtonGesture); + HoverWatcher::watcher(m_pdfView->viewport()); +} + +void PdfViewer::openPdfFile() +{ + disablePrinting(); + + if (m_file->open(QIODevice::ReadOnly)) + m_document->load(m_file.get()); + + const auto documentTitle = m_document->metaData(QPdfDocument::MetaDataField::Title).toString(); + statusMessage(!documentTitle.isEmpty() ? documentTitle : QStringLiteral("PDF Viewer")); + pageSelected(0); + m_pageSelector->setMaximum(m_document->pageCount() - 1); + + statusMessage(tr("Opened PDF file %1").arg(m_file->fileName())); + qCDebug(lcExample) << "Opened file" << m_file->fileName(); + + maybeEnablePrinting(); +} + +bool PdfViewer::hasContent() const +{ + return m_document ? m_document->pageCount() > 0 : false; +} + +#if defined(QT_ABSTRACTVIEWER_PRINTSUPPORT) +void PdfViewer::printDocument(QPrinter *printer) const +{ + if (!hasContent()) + return; + + QPainter painter; + painter.begin(printer); + const QRect pageRect = printer->pageRect(QPrinter::Unit::DevicePixel).toRect(); + const QSize pageSize = pageRect.size(); + for (int i = 0; i < m_document->pageCount(); ++i) { + if (i > 0) + printer->newPage(); + const QImage &page = m_document->render(i, pageSize); + painter.drawImage(pageRect, page); + } + painter.end(); +} +#endif // QT_ABSTRACTVIEWER_PRINTSUPPORT + +void PdfViewer::bookmarkSelected(const QModelIndex &index) +{ + if (!index.isValid()) + return; + + const int page = index.data(int(QPdfBookmarkModel::Role::Page)).toInt(); + const qreal zoomLevel = index.data(int(QPdfBookmarkModel::Role::Level)).toReal(); + m_pdfView->pageNavigator()->jump(page, {}, zoomLevel); +} + +void PdfViewer::pageSelected(int page) +{ + auto nav = m_pdfView->pageNavigator(); + nav->jump(page, {}, nav->currentZoom()); +} + +void PdfViewer::onActionZoomInTriggered() +{ + m_pdfView->setZoomFactor(m_pdfView->zoomFactor() * zoomMultiplier); +} + +void PdfViewer::onActionZoomOutTriggered() +{ + m_pdfView->setZoomFactor(m_pdfView->zoomFactor() / zoomMultiplier); +} + +void PdfViewer::onActionPreviousPageTriggered() +{ + auto nav = m_pdfView->pageNavigator(); + nav->jump(nav->currentPage() - 1, {}, nav->currentZoom()); +} + +void PdfViewer::onActionNextPageTriggered() +{ + auto nav = m_pdfView->pageNavigator(); + nav->jump(nav->currentPage() + 1, {}, nav->currentZoom()); +} + +void PdfViewer::onActionBackTriggered() +{ + m_pdfView->pageNavigator()->back(); +} + +void PdfViewer::onActionForwardTriggered() +{ + m_pdfView->pageNavigator()->forward(); +} |