printhandler.cpp Example File

webenginewidgets/printme/printhandler.cpp
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#include "printhandler.h" #include <QEventLoop> #include <QPrintDialog> #include <QPrinter> #include <QPainter> #include <QPrintPreviewDialog> #include <QWebEnginePage> PrintHandler::PrintHandler(QObject *parent) : QObject(parent) { } void PrintHandler::setPage(QWebEnginePage *page) { Q_ASSERT(!m_page); m_page = page; connect(m_page, &QWebEnginePage::printRequested, this, &PrintHandler::printPreview); } void PrintHandler::print() { QPrinter printer(QPrinter::HighResolution); QPrintDialog dialog(&printer, m_page->view()); if (dialog.exec() != QDialog::Accepted) return; printDocument(&printer); } void PrintHandler::printDocument(QPrinter *printer) { QEventLoop loop; bool result; auto printPreview = [&](bool success) { result = success; loop.quit(); }; m_page->print(printer, std::move(printPreview)); loop.exec(); if (!result) { QPainter painter; if (painter.begin(printer)) { QFont font = painter.font(); font.setPixelSize(20); painter.setFont(font); painter.drawText(QPointF(10,25), QStringLiteral("Could not generate print preview.")); painter.end(); } } } void PrintHandler::printPreview() { if (!m_page) return; if (m_inPrintPreview) return; m_inPrintPreview = true; QPrinter printer; QPrintPreviewDialog preview(&printer, m_page->view()); connect(&preview, &QPrintPreviewDialog::paintRequested, this, &PrintHandler::printDocument); preview.exec(); m_inPrintPreview = false; }