如何减少使用flutter创建的PDF中标题和内容之间的空间？

Question

我正在创建一个生成 PDF 的应用程序。但我需要缩小标题和内容之间的差距。我使用一个名为 pdf 的包来创建 PDF。 https://pub.dev/packages/pdf 这是包的链接。

我想缩小的空间用红色箭头表示。

这是我用来创建 PDF 的代码。

Future<Uint8List> _generatePdf() async {
  String name = controllerName.text;
  String age;
  String complain = controllerComplain.text;
  String systolicPressure = controllerSystolicPressure.text;
  String diastolicPressure = controllerDiastolicPressure.text;
  String fullPressure = systolicPressure + "/" + diastolicPressure + " mmHg";
  if (controllerAgeYears.text == '') {
  } else {
    age = controllerAgeYears.text + " years ";
  }
  if (controllerAgeMonths.text == '') {
  } else {
    age += controllerAgeMonths.text + ' Months';
  }
  String mOF = '';
  if (_isSelected[0] == true) {
    mOF = 'Male';
  } else {
    mOF = 'Female';
  }
  pdf.addPage(pw.MultiPage(
    pageFormat: PdfPageFormat.a5,
    margin: pw.EdgeInsets.all(32),
    build: (pw.Context context) {
      return <pw.Widget>[
        pw.Text("Methsuwa Family Clinic",
            style: pw.TextStyle(fontSize: 22)),
        pw.Header(
          level: 0,
          child: pw.Text("No: 607, Medamandiya, Panagoda, Homagame.",
              style: pw.TextStyle(fontSize: 10)),
        ),
        pw.Text('Name: ' + name, style: pw.TextStyle(fontSize: 10)),
        pw.SizedBox(height: 3),
        pw.Text('Age: ' + age, style: pw.TextStyle(fontSize: 10)),
        pw.SizedBox(height: 3),
        pw.Text('Gender: ' + mOF, style: pw.TextStyle(fontSize: 10)),
        pw.SizedBox(height: 3),
        pw.Text('Complains: ' + complain,
            style: pw.TextStyle(fontSize: 10)),
        pw.SizedBox(height: 3),
        pw.Text('Blood Pressure: ' + fullPressure,
            style: pw.TextStyle(fontSize: 10)),
        pw.SizedBox(height: 6),
        pw.Table.fromTextArray(
            context: context,
            headerStyle: pw.TextStyle(fontSize: 10),
            cellStyle: pw.TextStyle(fontSize: 10),
            data: <List<String>>[
              <String>['Drug', 'Amount', 'Days', 'When', 'Total'],
              ..._data.map((msg) => [
                    msg["drug"],
                    msg["amount"],
                    msg["days"],
                    msg["when"],
                    msg["total"]
                  ])
            ]),
        pw.SizedBox(height: 6),
        pw.Table.fromTextArray(
            context: context,
            headerStyle: pw.TextStyle(fontSize: 10),
            cellStyle: pw.TextStyle(fontSize: 10),
            data: <List<String>>[
              <String>['Investigations'],
              ...selectedInvestigations.map((msg) => [msg["investigation"]])
            ]),
        //pw.Text(
        //  'Daily:එදිනෙදා, BID:දිනකට දෙවරක්, TID:දිනකට තෙවරක්, QID:දිනකට සතරවරක්, QHS:නින්දට පෙර Q4h:සෑම පැය සතරකට වරක් Q4-6h:සෑම පැය සතරත් සයත් තුල  QWK:සෑම සතියකට වරක්',
        // ),
      ];
    }));

pdfPrint = pdf;
pdf = null;
pdf = pw.Document();

return pdfPrint.save();
}

Future savePdf() async {
pdf = null;
pdf = pw.Document();
}