main.dart
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import 'dart:async';
import 'dart:io';
import 'dart:ui';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:pdf/pdf.dart';
import 'package:printing/printing.dart';
import 'package:printing_example/document.dart';
void main() => runApp(MaterialApp(home: MyApp()));
class MyApp extends StatefulWidget {
@override
MyAppState createState() {
return MyAppState();
}
}
class MyAppState extends State<MyApp> {
final shareWidget = GlobalKey();
final previewContainer = GlobalKey();
void _printPdf() async {
print("Print ...");
final pdf = await generateDocument(PdfPageFormat.a4);
Printing.printPdf(document: pdf);
}
void _sharePdf() async {
print("Share ...");
final pdf = await generateDocument(PdfPageFormat.a4);
// Calculate the widget center for iPad sharing popup position
final RenderBox referenceBox =
shareWidget.currentContext.findRenderObject();
final topLeft =
referenceBox.localToGlobal(referenceBox.paintBounds.topLeft);
final bottomRight =
referenceBox.localToGlobal(referenceBox.paintBounds.bottomRight);
final bounds = Rect.fromPoints(topLeft, bottomRight);
Printing.sharePdf(document: pdf, bounds: bounds);
}
Future<void> _printScreen() async {
final pdf = PdfDocument(deflate: zlib.encode);
final page = PdfPage(pdf, pageFormat: PdfPageFormat.a4);
final g = page.getGraphics();
RenderRepaintBoundary boundary =
previewContainer.currentContext.findRenderObject();
final im = await boundary.toImage();
final bytes = await im.toByteData(format: ImageByteFormat.rawRgba);
print("Print Screen ${im.width}x${im.height} ...");
// Center the image
final w = page.pageFormat.width -
page.pageFormat.marginLeft -
page.pageFormat.marginRight;
final h = page.pageFormat.height -
page.pageFormat.marginTop -
page.pageFormat.marginBottom;
double iw, ih;
if (im.width.toDouble() / im.height.toDouble() < 1.0) {
ih = h;
iw = im.width.toDouble() * ih / im.height.toDouble();
} else {
iw = w;
ih = im.height.toDouble() * iw / im.width.toDouble();
}
PdfImage image = PdfImage(pdf,
image: bytes.buffer.asUint8List(), width: im.width, height: im.height);
g.drawImage(
image,
page.pageFormat.marginLeft + (w - iw) / 2.0,
page.pageFormat.height -
page.pageFormat.marginTop -
ih -
(h - ih) / 2.0,
iw,
ih);
Printing.printPdf(document: pdf);
}
@override
Widget build(BuildContext context) {
return RepaintBoundary(
key: previewContainer,
child: Scaffold(
appBar: AppBar(
title: const Text('Pdf Printing Example'),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
RaisedButton(
child: Text('Print Document'), onPressed: _printPdf),
RaisedButton(
key: shareWidget,
child: Text('Share Document'),
onPressed: _sharePdf),
RaisedButton(
child: Text('Print Screenshot'), onPressed: _printScreen),
],
),
),
));
}
}