PDF Viewer Example

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#include "pageselector.h" #include <QHBoxLayout> #include <QLabel> #include <QLineEdit> #include <QPdfPageNavigation> #include <QToolButton> PageSelector::PageSelector(QWidget *parent) : QWidget(parent) , m_pageNavigation(nullptr) { QHBoxLayout *layout = new QHBoxLayout(this); m_previousPageButton = new QToolButton(this); m_previousPageButton->setText("<"); m_previousPageButton->setEnabled(false); m_pageNumberEdit = new QLineEdit(this); m_pageNumberEdit->setAlignment(Qt::AlignRight); m_pageCountLabel = new QLabel(this); m_pageCountLabel->setText("0"); m_nextPageButton = new QToolButton(this); m_nextPageButton->setText(">"); m_nextPageButton->setEnabled(false); layout->addWidget(m_previousPageButton); layout->addWidget(m_pageNumberEdit); layout->addWidget(m_pageCountLabel); layout->addWidget(m_nextPageButton); } void PageSelector::setPageNavigation(QPdfPageNavigation *pageNavigation) { m_pageNavigation = pageNavigation; connect(m_previousPageButton, &QToolButton::clicked, m_pageNavigation, &QPdfPageNavigation::goToPreviousPage); connect(m_pageNavigation, &QPdfPageNavigation::canGoToPreviousPageChanged, m_previousPageButton, &QToolButton::setEnabled); connect(m_pageNavigation, &QPdfPageNavigation::currentPageChanged, this, &PageSelector::onCurrentPageChanged); connect(m_pageNavigation, &QPdfPageNavigation::pageCountChanged, this, [this](int pageCount){ m_pageCountLabel->setText(QString::fromLatin1("/ %1").arg(pageCount)); }); connect(m_pageNumberEdit, &QLineEdit::editingFinished, this, &PageSelector::pageNumberEdited); connect(m_nextPageButton, &QToolButton::clicked, m_pageNavigation, &QPdfPageNavigation::goToNextPage); connect(m_pageNavigation, &QPdfPageNavigation::canGoToNextPageChanged, m_nextPageButton, &QToolButton::setEnabled); onCurrentPageChanged(m_pageNavigation->currentPage()); } void PageSelector::onCurrentPageChanged(int page) { if (m_pageNavigation->pageCount() == 0) m_pageNumberEdit->setText(QString::number(0)); else m_pageNumberEdit->setText(QString::number(page + 1)); } void PageSelector::pageNumberEdited() { if (!m_pageNavigation) return; const QString text = m_pageNumberEdit->text(); bool ok = false; const int pageNumber = text.toInt(&ok); if (!ok) onCurrentPageChanged(m_pageNavigation->currentPage()); else m_pageNavigation->setCurrentPage(qBound(0, pageNumber - 1, m_pageNavigation->pageCount() - 1)); }