mainwindow.cpp Example File

pdfviewer/mainwindow.cpp

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  ** This file is part of the QtPDF module of the Qt Toolkit.
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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);
  }