Implement Share Wellbeing Score button

lib/pages/checkup.dart

@@ -1,9 +1,12 @@
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:nudge_me/main.dart';
+import 'package:nudge_me/notification.dart';
 import 'package:pedometer/pedometer.dart';
 import 'dart:async';
 import 'package:nudge_me/model/user_model.dart';
 import 'package:shared_preferences/shared_preferences.dart';
+import 'package:timezone/timezone.dart' as tz;
 
 class Checkup extends StatelessWidget {
  @override
@@ -76,6 +79,31 @@ class _CheckupWidgetsState extends State<CheckupWidgets> {
  return userSupportCode;
  }
 
+ /// returns `true` if given [List] is monotonically decreasing
+ bool _isDecreasing(List<dynamic> items) {
+ for (int i = 0; i < items.length - 1; ++i) {
+ if (items[i] <= items[i + 1]) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ /// nudges user if score drops n times in the last n+1 weeks.
+ /// For example if n == 2 and we have these 3 weeks/scores 8 7 6, the user
+ /// will be nudged.
+ void _checkWellbeing(final int n) async {
+ assert(n >= 1);
+ final List<WellbeingItem> items =
+ await UserWellbeingDB().getLastNWeeks(n + 1);
+ if (items.length == n + 1 && _isDecreasing(items)) {
+ // if there were enough scores, and they were decreasing
+ // TODO: perform proper nudge here
+ scheduleNotification(
+ tz.TZDateTime.now(tz.local).add(const Duration(seconds: 2)));
+ }
+ }
+
  @override
  Widget build(BuildContext context) {
  return Column(children: [
@@ -124,6 +152,8 @@ class _CheckupWidgetsState extends State<CheckupWidgets> {
  SharedPreferences.getInstance().then((value) =>
  value.setInt(PREV_STEP_COUNT_KEY, _currentTotalSteps));
  Navigator.pop(context);
+
+ _checkWellbeing(2); // nudges if scores dropped twice
  },
  child: const Text('Done'))
  ]);

lib/shared/share_button.dart

@@ -0,0 +1,50 @@
+import 'dart:ui';
+
+import 'package:flutter/rendering.dart';
+import 'package:pdf/pdf.dart';
+import 'package:pdf/widgets.dart' as pw;
+
+import 'package:flutter/material.dart';
+import 'package:printing/printing.dart';
+
+/// [StatelessWidget] that can share a widget as a PDF
+class ShareButton extends StatelessWidget {
+ final GlobalKey _printKey;
+ final String _filename;
+
+ /// Uses a [GlobalKey] to find the widget to be shared
+ const ShareButton(this._printKey, this._filename);
+
+ @override
+ Widget build(BuildContext context) {
+ return FlatButton(
+ onPressed: _share,
+ child: Icon(
+ Icons.share,
+ color: Colors.blueAccent,
+ ));
+ }
+
+ /// will get an [ImageProvider] for the widget associated with _printKey
+ Future<ImageProvider> _fromWidgetKey() async {
+ final RenderRepaintBoundary wrappedWidget =
+ _printKey.currentContext.findRenderObject();
+ final img = await wrappedWidget.toImage();
+ // needs to be a PNG format, otherwise the conversion won't work
+ final byteData = await img.toByteData(format: ImageByteFormat.png);
+ return MemoryImage(byteData.buffer.asUint8List());
+ }
+
+ void _share() async {
+ final doc = pw.Document();
+ final ImageProvider flutterImg = await _fromWidgetKey();
+ final pw.ImageProvider img = await flutterImageProvider(flutterImg);
+
+ doc.addPage(pw.Page(
+ pageFormat: PdfPageFormat.a4,
+ build: (pw.Context ctx) => pw.Center(child: pw.Image.provider(img))));
+
+ // opens the share panel
+ await Printing.sharePdf(bytes: doc.save(), filename: _filename);
+ }
+}

lib/shared/wellbeing_graph.dart

@@ -1,9 +1,12 @@
 import 'package:charts_flutter/flutter.dart' as charts;
 import 'package:flutter/material.dart';
 import 'package:nudge_me/model/user_model.dart';
+import 'package:nudge_me/shared/share_button.dart';
 
 const RECOMMENDED_STEPS_IN_WEEK = 70000;
 
+/// a [StatefulWidget] that displays the last wellbeing items in a graph,
+/// along with a share button
 class WellbeingGraph extends StatefulWidget {
  final bool animate;
 
@@ -14,6 +17,7 @@ class WellbeingGraph extends StatefulWidget {
 }
 
 class _WellbeingGraphState extends State<WellbeingGraph> {
+ final GlobalKey _printKey = GlobalKey();
  Future<List<WellbeingItem>> _wellbeingItems;
 
  @override
@@ -42,33 +46,38 @@ class _WellbeingGraphState extends State<WellbeingGraph> {
  );
  final seriesList = [scoreSeries, stepSeries];
 
- return new charts.NumericComboChart(
- seriesList,
- animate: animate,
- defaultRenderer: new charts.LineRendererConfig(),
- customSeriesRenderers: [
- new charts.BarRendererConfig(
- cornerStrategy: const charts.ConstCornerStrategy(25),
- customRendererId: 'customBar')
- ],
- behaviors: [
- new charts.SeriesLegend(), // adds labels to colors
- new charts.RangeAnnotation([
- new charts.RangeAnnotationSegment(
- 8, // start score for healthy
- 10, // end score for healthy
- charts.RangeAnnotationAxisType.measure,
- endLabel: 'Healthy',
- color: charts.MaterialPalette.gray.shade200,
- ),
- ]),
- // using title as axes label:
- new charts.ChartTitle('Week Number',
- behaviorPosition: charts.BehaviorPosition.bottom,
- titleOutsideJustification:
- charts.OutsideJustification.middleDrawArea),
- new charts.PanAndZoomBehavior(),
- ],
+ return Flexible(
+ child: RepaintBoundary( // uses [RepaintBoundary] so we have .toImage()
+ key: _printKey, // this container will be 'printed'/shared
+ child: charts.NumericComboChart(
+ seriesList,
+ animate: animate,
+ defaultRenderer: new charts.LineRendererConfig(),
+ customSeriesRenderers: [
+ new charts.BarRendererConfig(
+ cornerStrategy: const charts.ConstCornerStrategy(25),
+ customRendererId: 'customBar')
+ ],
+ behaviors: [
+ new charts.SeriesLegend(), // adds labels to colors
+ new charts.RangeAnnotation([
+ new charts.RangeAnnotationSegment(
+ 8, // start score for healthy
+ 10, // end score for healthy
+ charts.RangeAnnotationAxisType.measure,
+ endLabel: 'Healthy',
+ color: charts.MaterialPalette.gray.shade200,
+ ),
+ ]),
+ // using title as axes label:
+ new charts.ChartTitle('Week Number',
+ behaviorPosition: charts.BehaviorPosition.bottom,
+ titleOutsideJustification:
+ charts.OutsideJustification.middleDrawArea),
+ new charts.PanAndZoomBehavior(),
+ ],
+ ),
+ ),
  );
  }
 
@@ -79,7 +88,10 @@ class _WellbeingGraphState extends State<WellbeingGraph> {
  builder: (context, snapshot) {
  if (snapshot.hasData) {
  final items = snapshot.data;
- return _getGraph(items, widget.animate);
+ final graph = _getGraph(items, widget.animate);
+ return Column(
+ children: [graph, ShareButton(_printKey, 'wellbeing-score.pdf')],
+ );
  } else if (snapshot.hasError) {
  return Text("Error: ${snapshot.error}");
  }

pubspec.lock

@@ -15,6 +15,13 @@ packages:
  url: "https://pub.dartlang.org"
  source: hosted
  version: "0.41.1"
+ archive:
+ dependency: transitive
+ description:
+ name: archive
+ url: "https://pub.dartlang.org"
+ source: hosted
+ version: "2.0.13"
  args:
  dependency: transitive
  description:
@@ -29,6 +36,13 @@ packages:
  url: "https://pub.dartlang.org"
  source: hosted
  version: "2.5.0-nullsafety.1"
+ barcode:
+ dependency: transitive
+ description:
+ name: barcode
+ url: "https://pub.dartlang.org"
+ source: hosted
+ version: "1.17.1"
  boolean_selector:
  dependency: transitive
  description:
@@ -296,6 +310,13 @@ packages:
  url: "https://pub.dartlang.org"
  source: hosted
  version: "3.1.4"
+ image:
+ dependency: transitive
+ description:
+ name: image
+ url: "https://pub.dartlang.org"
+ source: hosted
+ version: "2.1.19"
  intl:
  dependency: transitive
  description:
@@ -380,6 +401,13 @@ packages:
  url: "https://pub.dartlang.org"
  source: hosted
  version: "1.8.0-nullsafety.1"
+ path_parsing:
+ dependency: transitive
+ description:
+ name: path_parsing
+ url: "https://pub.dartlang.org"
+ source: hosted
+ version: "0.1.4"
  path_provider_linux:
  dependency: transitive
  description:
@@ -401,6 +429,13 @@ packages:
  url: "https://pub.dartlang.org"
  source: hosted
  version: "0.0.4+3"
+ pdf:
+ dependency: "direct main"
+ description:
+ name: pdf
+ url: "https://pub.dartlang.org"
+ source: hosted
+ version: "1.13.0"
  pedantic:
  dependency: transitive
  description:
@@ -415,6 +450,13 @@ packages:
  url: "https://pub.dartlang.org"
  source: hosted
  version: "2.0.2"
+ petitparser:
+ dependency: transitive
+ description:
+ name: petitparser
+ url: "https://pub.dartlang.org"
+ source: hosted
+ version: "3.1.0"
  platform:
  dependency: transitive
  description:
@@ -436,6 +478,13 @@ packages:
  url: "https://pub.dartlang.org"
  source: hosted
  version: "1.4.0"
+ printing:
+ dependency: "direct main"
+ description:
+ name: printing
+ url: "https://pub.dartlang.org"
+ source: hosted
+ version: "3.7.2"
  process:
  dependency: transitive
  description:
@@ -464,6 +513,13 @@ packages:
  url: "https://pub.dartlang.org"
  source: hosted
  version: "0.1.5"
+ qr:
+ dependency: transitive
+ description:
+ name: qr
+ url: "https://pub.dartlang.org"
+ source: hosted
+ version: "1.3.0"
  quiver:
  dependency: transitive
  description:
@@ -672,6 +728,13 @@ packages:
  url: "https://pub.dartlang.org"
  source: hosted
  version: "0.1.2"
+ xml:
+ dependency: transitive
+ description:
+ name: xml
+ url: "https://pub.dartlang.org"
+ source: hosted
+ version: "4.5.1"
  yaml:
  dependency: transitive
  description:

pubspec.yaml

@@ -29,6 +29,8 @@ dependencies:
  flutter_local_notifications: ^3.0.2
  pedometer: ^2.0.2
  timezone: ^0.5.9 # needed for scheduling notifications
+ pdf: ^1.13.0
+ printing: ^3.7.2
 
  # data-related
  provider: ^3.0.0