Flutter 创建多个 PDF 页面

Question

I am trying to show results of a sql query as PDF page in flutter application. As long as the data do not cross a pagefull, it displays correctly. When data is more than a pagefull it results in "Exception: This widget created more than 20 pages. This may be an issue in the widget or the document. See https://pub.dev/documentation/pdf/latest/widgets/MultiPage-class.html"

My pdf generating code is like below where 'data' is a list of map data.

    pdf.addPage(pw.MultiPage(
        pageFormat: PdfPageFormat.a4,
        build: (pw.Context context) {
          return <pw.Widget>[
            pw.Column(children: [
              pw.Table(children: [
                pw.TableRow(children: [
                  ...data[0].keys.map((e) => pw.Text(e)),
                ]),
                ...data.map((e) {
                  return pw.TableRow(children: [
                    ...e.values.map((v) => pw.Text(v)),
                  ]);
                }),
              ])
            ])
          ];
        }));
    return pdf.save();
  }

I tried wrapping the pw.Column in various combinations (Flex, Partition, Table, Wrap, GridView, and Column.) as listed in https://pub.dev/documentation/pdf/latest/widgets/MultiPage-class.html

I am not able to grasp how to span the data over multiple pages automatically using the Flex, Partition, Table, Wrap, GridView, and Column. How Do I do that?

Or is there a way to detect current TableRow/Widget position and create new page on exceeding the page length (of course - margins)? Thanks a lot.

Answer 1

I resolved it by removing pw.Column in the above code. It works perfectly now. ie

return <pw.Widget>[
  pw.Table(children: [
  // rest of the code follows

Thanks