我需要知道如何将 QWidget 打印为 PDF 文件。 Widget (QDialog) 包含很多标签、一些 QPlainTextEdit 和一个背景图像。该对话框显示一张收据,其所有字段均已填写。
我已经尝试使用 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。
这是文件。
收据图片
![](https://i.stack.imgur.com/dudKH.jpg)
你必须使用QPrinter
这是您必须使用和需要的对象QPainter
绘制小部件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();
}
Widget:
![enter image description here](https://i.stack.imgur.com/IZfXj.png)
输出.pdf
![enter image description here](https://i.stack.imgur.com/SDAf2.png)
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