qt-everywhere-src-5.15.1/qtbase/src/printsupport/doc/snippets/widgetprinting.cpp

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#include <QtWidgets>
#include <QtPrintSupport/qtprintsupportglobal.h>
#if QT_CONFIG(printdialog)
#include <QPrinter>
#include <QPrintDialog>
#endif

class Window : public QWidget
{
    Q_OBJECT

public:
    Window()
    {
        myWidget = new QPushButton("Print Me");
        connect(myWidget, &QPushButton::clicked, this, &Window::print);
        myWidget2 = new QPushButton("Print Document");
        connect(myWidget2, &QPushButton::clicked, this, &Window::printFile);
        editor = new QTextEdit(this);

        QVBoxLayout *layout = new QVBoxLayout;
        layout->addWidget(myWidget);
        layout->addWidget(myWidget2);
        layout->addWidget(editor);
        setLayout(layout);
    }

private slots:
    void print()
    {
    #if defined(QT_PRINTSUPPORT_LIB) && QT_CONFIG(printer)
        QPrinter printer(QPrinter::HighResolution);

        printer.setOutputFileName("test.pdf");

//! [0]
        QPainter painter;
        painter.begin(&printer);
        double xscale = printer.pageRect().width() / double(myWidget->width());
        double yscale = printer.pageRect().height() / double(myWidget->height());
        double scale = qMin(xscale, yscale);
        painter.translate(printer.paperRect().x() + printer.pageRect().width()/2,
                           printer.paperRect().y() + printer.pageRect().height()/2);
        painter.scale(scale, scale);
        painter.translate(-width()/2, -height()/2);

        myWidget->render(&painter);
//! [0]
    #endif
    }

    void printFile()
    {
    #if defined(QT_PRINTSUPPORT_LIB) && QT_CONFIG(printdialog)
//! [1]
        QPrinter printer;

        QPrintDialog dialog(&printer, this);
        dialog.setWindowTitle(tr("Print Document"));
        if (editor->textCursor().hasSelection())
            dialog.addEnabledOption(QAbstractPrintDialog::PrintSelection);
        if (dialog.exec() != QDialog::Accepted) {
            return;
        }
//! [1]
        editor->print(&printer);
    #endif
    }

private:
    QPushButton *myWidget;
    QPushButton *myWidget2;
    QTextEdit   *editor;
};

#include "main.moc"

int main(int argv, char **args)
{
    QApplication app(argv, args);

    Window window;
    window.show();

    return app.exec();
}