背景我的 Flutter 应用程序使用pdf/pdf.dart包以创建 PDF 文档，该文档显示 Firestore 数据库集合中的信息。
PDF 文档包含一个表格。
我想以动态和编程方式在表中为 Firestore 集合中的每条记录创建一行。
当前状态我已经能够创建 PDF 文档和具有预设行数的静态表格。但是，我无法动态地以编程方式在表中为 Firestore 集合中的每条记录创建一行。
Question如何以动态和编程方式在表中为指定 Firestore 集合中的每条记录创建一行？
代码片段：表格
pw.Table(border: pw.TableBorder(), children: [
pw.TableRow(
children: [
paddedHeadingTextCell('Product'),
paddedHeadingTextCell('Unit'),
paddedHeadingTextCell('Qty'),
paddedHeadingTextCell('Price'),
paddedHeadingTextCell('Discount'),
paddedHeadingTextCell('Tax'),
paddedHeadingTextCell('Total AUD'),
],
),
// Now the next table row
buildRowsForInventoryItems(), // This triggers the Row Builder, which does not work.
])
代码片段：非功能行生成器
pw.TableRow buildRowsForInventoryItems() {
List<pw.Column> itemList = [];
var items = DatabaseService().returnAllInventoryItemsFromAPurchaseOrder();
for (var item in items) {
final description = item.data()['description'].toString();
final unit = item.data()['unit'].toString();
final qty = item.data()['qty'].toString();
itemList.add(
pw.Column(
children: [
pw.Text(description),
],
),
);
itemList.add(
pw.Column(
children: [
pw.Text(unit),
],
),
);
itemList.add(
pw.Column(
children: [
pw.Text(qty),
],
),
);
}
return pw.TableRow(children: itemList);
}
完整代码
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:invento/constants.dart';
import 'package:pdf/pdf.dart';
import 'package:pdf/widgets.dart' as pw;
import 'package:universal_html/html.dart' as html;
import 'package:invento/Services/database_service.dart';
class reporting extends StatefulWidget {
@override
_reportingState createState() => _reportingState();
}
final pdf = pw.Document();
String orderNumber = '<<Order_Number>>';
String disclaimerText = '<<Disclaimer_Text>>';
String supplierEmailAddress = '<<Supplier_Name>>';
String supplierName = '<<Supplier_Email_Address>>';
String orderDate = '<<Order_Date>>';
String requiredByDate = '<<Required_By_Date>>';
String ourShipmentAddress = '<<Our_Shipment_Address>>';
String notes = '<<Notes>>';
void createPdfDocument(pw.Document pdf) {
pdf.addPage(pw.MultiPage(
pageFormat: PdfPageFormat.a4,
margin: pw.EdgeInsets.all(31), // This is the page margin
build: (pw.Context context) {
return <pw.Widget>[
// Document heading with logo, disclaimer text, and title
pw.Table(
children: [
pw.TableRow(
children: [
pw.Column(
crossAxisAlignment: pw.CrossAxisAlignment.start,
children: [
//
pw.Placeholder(
fallbackHeight: 50,
fallbackWidth: 75,
strokeWidth: 2),
pw.Text(
'$disclaimerText',
style: pw.TextStyle(fontSize: 8, color: PdfColors.grey),
),
],
),
pw.Column(
mainAxisAlignment: pw.MainAxisAlignment.center,
crossAxisAlignment: pw.CrossAxisAlignment.end,
children: [
pw.Text(
'Purchase Order',
style: pw.TextStyle(
fontSize: 28, color: PdfColors.deepOrange400),
),
pw.Text('Reference Number $orderNumber',
textAlign: pw.TextAlign.right),
],
),
],
),
],
//
),
// Gap
pw.Divider(color: PdfColors.white, thickness: 10),
// Supplier Details
pw.Table(// This is the starting widget for the table
children: [
pw.TableRow(
// This is the starting row for the table, within which the subsequent columns will be nested
children: [
pw.Padding(
padding: pw.EdgeInsets.all(4),
child: pw.Column(
crossAxisAlignment: pw.CrossAxisAlignment.start,
children: [
pw.Text(
'Purchase Order To',
style: pwTableHeadingTextStyle(),
),
pw.Text(supplierName),
pw.Text(supplierEmailAddress),
],
),
),
pw.Padding(
padding: pw.EdgeInsets.all(4),
child: pw.Column(
crossAxisAlignment: pw.CrossAxisAlignment.start,
children: [
pw.Text(
'Order Date',
style: pwTableHeadingTextStyle(),
),
pw.Text(orderDate),
]),
),
pw.Padding(
padding: pw.EdgeInsets.all(4),
child: pw.Column(
crossAxisAlignment: pw.CrossAxisAlignment.start,
children: [
pw.Text(
'Required By',
style: pwTableHeadingTextStyle(),
),
pw.Text(requiredByDate),
]),
),
],
),
]),
pw.Table(children: [
pw.TableRow(// This is the second row for the table
children: [
pw.Padding(
padding: pw.EdgeInsets.all(4),
child: pw.Column(
crossAxisAlignment: pw.CrossAxisAlignment.start,
children: [
pw.Text(
'Ship To',
style: pwTableHeadingTextStyle(),
),
pw.Text(ourShipmentAddress),
],
),
),
]),
//
// Now the third row of the table
]),
pw.Table(children: [
pw.TableRow(// This is the third row for the table
children: [
pw.Padding(
padding: pw.EdgeInsets.all(4),
child: pw.Column(
crossAxisAlignment: pw.CrossAxisAlignment.start,
children: [
pw.Text(
'Notes',
style: pwTableHeadingTextStyle(),
),
pw.Text(notes),
],
),
),
]),
]),
//Gap
pw.Divider(color: PdfColors.white, thickness: 10),
//Section Header: Stocked Items
pw.Header(text: 'Stocked Items'),
// Stocked Items Table
// Next Table
pw.Table(border: pw.TableBorder(), children: [
pw.TableRow(
children: [
paddedHeadingTextCell('Product'),
paddedHeadingTextCell('Unit'),
paddedHeadingTextCell('Qty'),
paddedHeadingTextCell('Price'),
paddedHeadingTextCell('Discount'),
paddedHeadingTextCell('Tax'),
paddedHeadingTextCell('Total AUD'),
],
),
// Now the next table row
buildRowsForInventoryItems(),
]),
//Gap
pw.Divider(color: PdfColors.white, thickness: 10),
//Section Header: Stocked Items
pw.Header(text: 'Custom Build Items and Additional Costs'),
//
// Stocked Items Table
// Next Table
pw.Table(border: pw.TableBorder(), children: [
pw.TableRow(
children: [
paddedHeadingTextCell('Description'),
paddedHeadingTextCell('Unit'),
paddedHeadingTextCell('Qty'),
paddedHeadingTextCell('Price'),
paddedHeadingTextCell('Discount'),
paddedHeadingTextCell('Tax'),
paddedHeadingTextCell('Total AUD'),
],
),
// Now the next table row
buildRowsForNonInventoryItems(),
]),
//
// Gap
pw.Divider(color: PdfColors.white, thickness: 10),
// Totals heading
pw.Header(text: 'Totals'),
// Totals Table
pw.Table(border: pw.TableBorder(), children: [
pw.TableRow(children: [
pw.Padding(
padding: pw.EdgeInsets.all(4),
child: pw.Column(children: [
pw.Text(' '),
]),
),
paddedHeadingTextCell('Stocked Items'),
paddedHeadingTextCell('Additional Costs'),
paddedHeadingTextCell('Order Total'),
]),
//
// Now row 2 (the first row with data)
pw.TableRow(children: [
paddedHeadingTextCell('Before Tax'),
paddedTextCell('_______'),
paddedTextCell('_______'),
paddedTextCell('_______'),
]),
//
// Now row 4 (the third row with data)
pw.TableRow(children: [
paddedHeadingTextCell('Tax'),
paddedTextCell('_______'),
paddedTextCell('_______'),
paddedTextCell('_______'),
]),
//
// Now row 2 (the first row with data)
pw.TableRow(children: [
paddedHeadingTextCell('Total'),
paddedTextCell('_______'),
paddedTextCell('_______'),
paddedTextCell('_______'),
])
]),
//
// Divider
pw.Divider(color: PdfColors.white, thickness: 10),
pw.Paragraph(text: kLoremIpsum),
];
}));
}
pw.TableRow buildRowsForInventoryItems() {
List<pw.Column> itemList = [];
var items = DatabaseService().returnAllInventoryItemsFromAPurchaseOrder();
for (var item in items) {
final description = item.data()['description'].toString();
final unit = item.data()['unit'].toString();
final qty = item.data()['qty'].toString();
itemList.add(
pw.Column(
children: [
pw.Text(description),
],
),
);
itemList.add(
pw.Column(
children: [
pw.Text(unit),
],
),
);
itemList.add(
pw.Column(
children: [
pw.Text(qty),
],
),
);
}
return pw.TableRow(children: itemList);
}
buildRowsForNonInventoryItems() {
return pw.TableRow(children: [
paddedTextCell('_____'),
paddedTextCell('_____'),
paddedTextCell('_____'),
paddedTextCell('_____'),
paddedTextCell('_____'),
paddedTextCell('_____'),
paddedTextCell('_____'),
]);
}
pw.TextStyle pwTableHeadingTextStyle() =>
pw.TextStyle(fontWeight: pw.FontWeight.bold);
pw.Padding paddedTextCell(String textContent) {
return pw.Padding(
padding: pw.EdgeInsets.all(4),
child:
pw.Column(crossAxisAlignment: pw.CrossAxisAlignment.start, children: [
pw.Text(textContent, textAlign: pw.TextAlign.left),
]),
);
}
pw.Padding paddedHeadingTextCell(String textContent) {
return pw.Padding(
padding: pw.EdgeInsets.all(4),
child: pw.Column(children: [
pw.Text(
textContent,
style: pwTableHeadingTextStyle(),
),
]),
);
}
class _reportingState extends State<reporting> {
@override
Widget build(BuildContext context) {
final pdf = pw.Document();
createPdfDocument(pdf);
final bytes = pdf.save();
final blob = html.Blob([bytes], 'application/pdf');
return Scaffold(
appBar: AppBar(
title: Text('Search for item'),
),
drawer: myGlobalDrawer(),
bottomNavigationBar: kStandardBottomNavigationBarForNoFAB(),
floatingActionButton: null,
body: Column(
children: [
MaterialButton(
child: Text('Create and view in browser'),
color: Colors.yellow,
onPressed: () async {
print('i got tapped');
final url = html.Url.createObjectUrlFromBlob(blob);
html.window.open(url, "_blank");
html.Url.revokeObjectUrl(url);
}),
RaisedButton(
child: Text("Create and download"),
onPressed: () {
final url = html.Url.createObjectUrlFromBlob(blob);
final anchor =
html.document.createElement('a') as html.AnchorElement
..href = url
..style.display = 'none'
..download = 'some_name.pdf';
html.document.body.children.add(anchor);
anchor.click();
html.document.body.children.remove(anchor);
html.Url.revokeObjectUrl(url);
},
),
],
),
);
}
}
