Exception when sink is passed to touchResponseSink

[janstol]

When I pass sink to the chart (touchResponseSink: controller.sink), the app throws following exception on touch event end (when I lift finger off the screen):

I/flutter (12415): ══╡ EXCEPTION CAUGHT BY FOUNDATION LIBRARY ╞════════════════════════════════════════════════════════
I/flutter (12415): The following assertion was thrown while dispatching notifications for FlTouchInputNotifier:
I/flutter (12415): 'package:flutter/src/rendering/object.dart': Failed assertion: line 1930 pos 12: 'owner == null ||
I/flutter (12415): !owner.debugDoingPaint': is not true.
I/flutter (12415): 
I/flutter (12415): Either the assertion indicates an error in the framework itself, or we should provide substantially
I/flutter (12415): more information in this error message to help you determine and fix the underlying cause.
I/flutter (12415): In either case, please report this assertion by filing a bug on GitHub:
I/flutter (12415):   https://github.com/flutter/flutter/issues/new?template=BUG.md
I/flutter (12415): 
I/flutter (12415): When the exception was thrown, this was the stack:
I/flutter (12415): #2      RenderObject.markNeedsPaint (package:flutter/src/rendering/object.dart:1930:12)
I/flutter (12415): #3      ChangeNotifier.notifyListeners (package:flutter/src/foundation/change_notifier.dart:206:21)
I/flutter (12415): #4      ValueNotifier.value= (package:flutter/src/foundation/change_notifier.dart:273:5)
I/flutter (12415): #5      BaseChartPainter.releaseIfEndTouch (package:fl_chart/src/chart/base/base_chart/base_chart_painter.dart:132:26)
I/flutter (12415): #6      LineChartPainter.paint (package:fl_chart/src/chart/line_chart/line_chart_painter.dart:104:7)
I/flutter (12415): #7      RenderCustomPaint._paintWithPainter (package:flutter/src/rendering/custom_paint.dart:528:13)
I/flutter (12415): #8      RenderCustomPaint.paint (package:flutter/src/rendering/custom_paint.dart:566:7)
I/flutter (12415): #9      RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2089:7)
I/flutter (12415): #10     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:172:13)
I/flutter (12415): #11     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:123:15)
I/flutter (12415): #12     RenderPointerListener.paint (package:flutter/src/rendering/proxy_box.dart:2669:11)
I/flutter (12415): #13     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2089:7)
I/flutter (12415): #14     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:172:13)
I/flutter (12415): #15     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:123:15)
I/flutter (12415): #16     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2089:7)
I/flutter (12415): #17     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:172:13)
I/flutter (12415): #18     RenderShiftedBox.paint (package:flutter/src/rendering/shifted_box.dart:70:15)
I/flutter (12415): #19     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2089:7)
I/flutter (12415): #20     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:172:13)
I/flutter (12415): #21     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:123:15)
I/flutter (12415): #22     RenderDecoratedBox.paint (package:flutter/src/rendering/proxy_box.dart:1953:11)
I/flutter (12415): #23     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2089:7)
I/flutter (12415): #24     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:172:13)
I/flutter (12415): #25     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:123:15)
I/flutter (12415): #26     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2089:7)
I/flutter (12415): #27     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:172:13)
I/flutter (12415): #28     _RenderCustomMultiChildLayoutBox&RenderBox&ContainerRenderObjectMixin&RenderBoxContainerDefaultsMixin.defaultPaint (package:flutter/src/rendering/box.dart:2509:15)
I/flutter (12415): #29     RenderCustomMultiChildLayoutBox.paint (package:flutter/src/rendering/custom_layout.dart:361:5)
I/flutter (12415): #30     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2089:7)
I/flutter (12415): #31     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:172:13)
I/flutter (12415): #32     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:123:15)
I/flutter (12415): #33     _RenderInkFeatures.paint (package:flutter/src/material/material.dart:510:11)
I/flutter (12415): #34     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2089:7)
I/flutter (12415): #35     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:172:13)
I/flutter (12415): #36     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:123:15)
I/flutter (12415): #37     PaintingContext.pushLayer (package:flutter/src/rendering/object.dart:369:12)
I/flutter (12415): #38     RenderPhysicalModel.paint (package:flutter/src/rendering/proxy_box.dart:1724:15)
I/flutter (12415): #39     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2089:7)
I/flutter (12415): #40     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:172:13)
I/flutter (12415): #41     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:123:15)
I/flutter (12415): #42     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2089:7)
I/flutter (12415): #43     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:172:13)
I/flutter (12415): #44     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:123:15)
I/flutter (12415): #45     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2089:7)
I/flutter (12415): #46     PaintingContext._repaintCompositedChild (package:flutter/src/rendering/object.dart:127:11)
I/flutter (12415): #47     PaintingContext.repaintCompositedChild (package:flutter/src/rendering/object.dart:95:5)
I/flutter (12415): #48     PipelineOwner.flushPaint (package:flutter/src/rendering/object.dart:858:29)
I/flutter (12415): #49     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:348:19)
I/flutter (12415): #50     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:701:13)
I/flutter (12415): #51     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:285:5)
I/flutter (12415): #52     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1016:15)
I/flutter (12415): #53     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:958:9)
I/flutter (12415): #54     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:874:5)
I/flutter (12415): #58     _invoke (dart:ui/hooks.dart:236:10)
I/flutter (12415): #59     _drawFrame (dart:ui/hooks.dart:194:3)
I/flutter (12415): (elided 5 frames from class _AssertionError and package dart:async)
I/flutter (12415): 
I/flutter (12415): The FlTouchInputNotifier sending notification was:
I/flutter (12415):   FlTouchInputNotifier#c0f42(Instance of 'NonTouch')
I/flutter (12415): ════════════════════════════════════════════════════════════════════════════════════════════════════

Sample:

import 'dart:async';

import 'package:fl_chart/fl_chart.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

void main() {
  runApp(
    MaterialApp(
      title: "Chart",
      home: Scaffold(
        appBar: AppBar(title: Text("Chart"),),
        body: LineChartSample2(),
      ),
    )
  );
}


class LineChartSample2 extends StatefulWidget {

  @override
  _LineChartSample2State createState() => _LineChartSample2State();
}

class _LineChartSample2State extends State<LineChartSample2> {

  StreamController<LineTouchResponse> controller;

  @override
  void initState() {
    super.initState();
    controller = StreamController();
    controller.stream.distinct().listen((LineTouchResponse response){
      /// do whatever you want and change any property of the chart.
    });
  }

  @override
  void dispose() {
    controller.close();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return AspectRatio(
      aspectRatio: 1,
      child: Container(
        decoration: BoxDecoration(
            color: Color(0xff232d37)
        ),
        child: Padding(
          padding: const EdgeInsets.only(right: 18.0, left: 12.0, top: 24, bottom: 12),
          child: FlChart(
            chart: LineChart(
              LineChartData(
                lineTouchData: LineTouchData(touchResponseSink: controller.sink),
                gridData: FlGridData(
                  show: true,
                  drawHorizontalGrid: true,
                  getDrawingVerticalGridLine: (value) {
                    return const FlLine(
                      color: Color(0xff37434d),
                      strokeWidth:  1,
                    );
                  },
                  getDrawingHorizontalGridLine: (value) {
                    return const FlLine(
                      color: Color(0xff37434d),
                      strokeWidth: 1,
                    );
                  },
                ),
                titlesData: FlTitlesData(
                  show: true,
                  bottomTitles: SideTitles(
                    showTitles: true,
                    reservedSize: 22,
                    textStyle: TextStyle(
                        color: const Color(0xff68737d),
                        fontWeight: FontWeight.bold,
                        fontSize: 16
                    ),
                    getTitles: (value) {
                      switch(value.toInt()) {
                        case 2: return 'MAR';
                        case 5: return 'JUN';
                        case 8: return 'SEP';
                      }

                      return '';
                    },
                    margin: 8,
                  ),
                  leftTitles: SideTitles(
                    showTitles: true,
                    textStyle: TextStyle(
                      color: const Color(0xff67727d),
                      fontWeight: FontWeight.bold,
                      fontSize: 15,
                    ),
                    getTitles: (value) {
                      switch(value.toInt()) {
                        case 1: return '10k';
                        case 3: return '30k';
                        case 5: return '50k';
                      }
                      return '';
                    },
                    reservedSize: 28,
                    margin: 12,
                  ),
                ),
                borderData: FlBorderData(
                    show: true,
                    border: Border.all(color: Color(0xff37434d), width: 1)
                ),
                minX: 0,
                maxX: 11,
                minY: 0,
                maxY: 6,
                lineBarsData: [
                  LineChartBarData(
                    spots: [
                      FlSpot(0, 3),
                      FlSpot(2.6, 2),
                      FlSpot(4.9, 5),
                      FlSpot(6.8, 3.1),
                      FlSpot(8, 4),
                      FlSpot(9.5, 3),
                      FlSpot(11, 4),
                    ],
                    isCurved: true,
                    barWidth: 5,
                    isStrokeCapRound: true,
                    dotData: FlDotData(show: false),
                    belowBarData: BelowBarData(show: false),
                  ),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }
}

[imaNNeo]

Thanks, let me check

[gavinerasmus]

Me too

[imaNNeo]

I'm on it

[imaNNeo]

Hey guys it is fixed on 0.2.1, but also 0.2.2 is available, sorry for the delay,
Cheers!