PDF Viewer Example

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#include "mainwindow.h" #include "ui_mainwindow.h" #include "pageselector.h" #include "zoomselector.h" #include <QFileDialog> #include <QMessageBox> #include <QPdfBookmarkModel> #include <QPdfDocument> #include <QPdfPageNavigation> #include <QtMath> const qreal zoomMultiplier = qSqrt(2.0); Q_LOGGING_CATEGORY(lcExample, "qt.examples.pdfviewer") MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) , ui(new Ui::MainWindow) , m_zoomSelector(new ZoomSelector(this)) , m_pageSelector(new PageSelector(this)) , m_document(new QPdfDocument(this)) { ui->setupUi(this); m_zoomSelector->setMaximumWidth(150); ui->mainToolBar->insertWidget(ui->actionZoom_In, m_zoomSelector); m_pageSelector->setMaximumWidth(150); ui->mainToolBar->addWidget(m_pageSelector); m_pageSelector->setPageNavigation(ui->pdfView->pageNavigation()); connect(m_zoomSelector, &ZoomSelector::zoomModeChanged, ui->pdfView, &QPdfView::setZoomMode); connect(m_zoomSelector, &ZoomSelector::zoomFactorChanged, ui->pdfView, &QPdfView::setZoomFactor); m_zoomSelector->reset(); QPdfBookmarkModel *bookmarkModel = new QPdfBookmarkModel(this); bookmarkModel->setDocument(m_document); ui->bookmarkView->setModel(bookmarkModel); connect(ui->bookmarkView, SIGNAL(activated(QModelIndex)), this, SLOT(bookmarkSelected(QModelIndex))); ui->tabWidget->setTabEnabled(1, false); // disable 'Pages' tab for now ui->pdfView->setDocument(m_document); connect(ui->pdfView, &QPdfView::zoomFactorChanged, m_zoomSelector, &ZoomSelector::setZoomFactor); } MainWindow::~MainWindow() { delete ui; } void MainWindow::open(const QUrl &docLocation) { if (docLocation.isLocalFile()) { m_document->load(docLocation.toLocalFile()); const auto documentTitle = m_document->metaData(QPdfDocument::Title).toString(); setWindowTitle(!documentTitle.isEmpty() ? documentTitle : QStringLiteral("PDF Viewer")); } else { qCDebug(lcExample) << docLocation << "is not a valid local file"; QMessageBox::critical(this, tr("Failed to open"), tr("%1 is not a valid local file").arg(docLocation.toString())); } qCDebug(lcExample) << docLocation; } void MainWindow::bookmarkSelected(const QModelIndex &index) { if (!index.isValid()) return; const int page = index.data(QPdfBookmarkModel::PageNumberRole).toInt(); ui->pdfView->pageNavigation()->setCurrentPage(page); } void MainWindow::on_actionOpen_triggered() { QUrl toOpen = QFileDialog::getOpenFileUrl(this, tr("Choose a PDF"), QUrl(), "Portable Documents (*.pdf)"); if (toOpen.isValid()) open(toOpen); } void MainWindow::on_actionQuit_triggered() { QApplication::quit(); } void MainWindow::on_actionAbout_triggered() { QMessageBox::about(this, tr("About PdfViewer"), tr("An example using QPdfDocument")); } void MainWindow::on_actionAbout_Qt_triggered() { QMessageBox::aboutQt(this); } void MainWindow::on_actionZoom_In_triggered() { ui->pdfView->setZoomFactor(ui->pdfView->zoomFactor() * zoomMultiplier); } void MainWindow::on_actionZoom_Out_triggered() { ui->pdfView->setZoomFactor(ui->pdfView->zoomFactor() / zoomMultiplier); } void MainWindow::on_actionPrevious_Page_triggered() { ui->pdfView->pageNavigation()->goToPreviousPage(); } void MainWindow::on_actionNext_Page_triggered() { ui->pdfView->pageNavigation()->goToNextPage(); } void MainWindow::on_actionContinuous_triggered() { ui->pdfView->setPageMode(ui->actionContinuous->isChecked() ? QPdfView::MultiPage : QPdfView::SinglePage); }