如何在Qt中打印QWidget?

问题描述

我需要知道如何将QWidget打印为PDF文件.窗口小部件(QDialog)包含许多标签，一些QPlainTextEdit和背景图像.对话框显示收据，其所有字段均已填写.

I need to know how to print a QWidget as a PDF file. The Widget (QDialog) contains a lot of labels, some QPlainTextEdit and a background image. The Dialog shows a receipt with all of its field already filled.

我已经尝试过使用QTextDocument和html来实现此目的，但是收据的复杂性(大量图像和格式自定义)使html输出完全混乱了.

I already tried using QTextDocument and html for this purpose, but the complexity of the receipt(lots of image and format customisation) makes the html output completely messed up.

这是文档.

接收图片

推荐答案

您必须使用 QPrinter ，这是您必须使用的对象，并且需要 QPainter 进行绘制 QPrinter 中的小部件.

You have to use QPrinter and this is the object that you must use and requires QPainter to draw the widget in QPrinter.

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QDialog w;

    w.setLayout(new QVBoxLayout());
    w.layout()->addWidget(new QLineEdit("text"));
    w.layout()->addWidget(new QPushButton("btn"));
    w.layout()->addWidget(new QPlainTextEdit("Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris rutrum magna semper nisi faucibus, at auctor dolor ullamcorper. Phasellus facilisis blandit augue sit amet placerat. Aliquam nec imperdiet diam. Proin dignissim vulputate metus, nec tincidunt magna vulputate ac. Praesent vel felis ac dolor viverra tempus eu vitae neque. Nulla efficitur gravida arcu id suscipit. Maecenas placerat egestas velit quis interdum. Nulla diam massa, hendrerit vitae mi et, placerat aliquam nisl. Donec tincidunt lobortis orci, quis egestas augue tempus sed. Nulla vel dolor eget ipsum accumsan placerat ut at magna."));
    w.show();

    QPushButton btn("print");
    btn.show();

    QObject::connect(&btn, &QPushButton::clicked, [&w](){
        QPrinter printer(QPrinter::HighResolution);
        printer.setOutputFormat(QPrinter::PdfFormat);
        printer.setOutputFileName("output.pdf");
        printer.setPageMargins(12, 16, 12, 20, QPrinter::Millimeter);
        printer.setFullPage(false);

        QPainter painter(&printer);

        double xscale = printer.pageRect().width() / double(w.width());
        double yscale = printer.pageRect().height() / double(w.height());
        double scale = qMin(xscale, yscale);
        painter.translate(printer.paperRect().center());
        painter.scale(scale, scale);
        painter.translate(-w.width()/ 2, -w.height()/ 2);
        w.render(&painter);
    });

    return a.exec();
}

小部件:

output.pdf

output.pdf

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