widgetprinting.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
#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");
 
        QPainter painter;
        painter.begin(&printer);
        const auto pageLayout = printer.pageLayout();
        const auto pageRect = pageLayout.paintRectPixels(printer.resolution());
        const auto paperRect = pageLayout.fullRectPixels(printer.resolution());
        double xscale = pageRect.width() / double(myWidget->width());
        double yscale = pageRect.height() / double(myWidget->height());
        double scale = qMin(xscale, yscale);
        painter.translate(pageRect.x() + paperRect.width() / 2.,
                          pageRect.y() + paperRect.height() / 2.);
        painter.scale(scale, scale);
        painter.translate(-myWidget->width() / 2., -myWidget->height() / 2.);
 
        myWidget->render(&painter);
    #endif
    }
 
    void printFile()
    {
    #if defined(QT_PRINTSUPPORT_LIB) && QT_CONFIG(printdialog)
        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;
        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();
}