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// 打印预览
void singleText::filePrintPreview()
{
QPrinter printer(QPrinter::HighResolution);
QPrintPreviewDialog preview(&printer, this);
// preview.setFocusProxy (this -> document());
// preview.setParent(this -> document());
preview.showNormal ();
preview.setWindowTitle(fileName + tr(" 文件打印预览"));
connect(&preview, SIGNAL(paintRequested(QPrinter *)), this, SLOT(print(QPrinter *)));
preview.exec();
return;
}