PDF 查看器范例

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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);
}