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[flutter_markdown] Null check operator used on a null value in MarkdownBuilder._buildRichText.<fn>(builder.dart:957) about flutter HOT 6 OPEN

jimmyff commented on July 20, 2024 1

[flutter_markdown] Null check operator used on a null value in MarkdownBuilder._buildRichText.(builder.dart:957)

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Comments (6)

jimmyff commented on July 20, 2024

@bogdannedelcu Did you get any further with your original issue reporting this? #146282

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bogdannedelcu commented on July 20, 2024

That parameter which is optional should be set. Then no more errors like this. It is indeed a bug in the code. Either correct the code or add mandatory to the parameter. În joi, 6 iun. 2024 la 17:42 Jimmy Forrester-Fellowes < ***@***.***> a scris:

…

@bogdannedelcu <https://github.com/bogdannedelcu> Did you get any further with your original issue reporting this? #146282 <#146282> — Reply to this email directly, view it on GitHub <#149817 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACAJSJA6QCGFSY4C45NVZP3ZGBYMTAVCNFSM6AAAAABI44ENE6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDCNJSG4YTINRQGQ> . You are receiving this because you were mentioned.Message ID: ***@***.***>

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jsoberan commented on July 20, 2024

I've confirmed that setting the onSelectionChanged parameter fixes the exception.

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darshankawar commented on July 20, 2024

@jimmyff Please check above possible solution and see if it helps in your case or not.

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jimmyff commented on July 20, 2024

I'll add the parameter but also sent a PR with the fix

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darshankawar commented on July 20, 2024

I observed a similar error log upon running below code sample and while trying to select text from the code blocks and seems to occur only when we pass selectable: true. Without it, below error doesn't occur.

======== Exception caught by widgets ===============================================================
The following _TypeError was thrown while calling onSelectionChanged for SelectionChangedCause.longPress:
Null check operator used on a null value

When the exception was thrown, this was the stack: 
#0      MarkdownBuilder._buildRichText.<anonymous closure> (package:flutter_markdown/src/builder.dart:966:35)
#1      _SelectableTextState._handleSelectionChanged (package:flutter/src/material/selectable_text.dart:628:32)
#2      EditableTextState._handleSelectionChanged (package:flutter/src/widgets/editable_text.dart:3972:34)
#3      EditableTextState._formatAndSetValue (package:flutter/src/widgets/editable_text.dart:4180:7)
#4      EditableTextState.userUpdateTextEditingValue (package:flutter/src/widgets/editable_text.dart:4550:5)
#5      RenderEditable._setTextEditingValue (package:flutter/src/rendering/editable.dart:719:27)
#6      RenderEditable._setSelection (package:flutter/src/rendering/editable.dart:738:5)
#7      RenderEditable.selectWordsInRange (package:flutter/src/rendering/editable.dart:2117:5)
#8      RenderEditable.selectWord (package:flutter/src/rendering/editable.dart:2098:5)
#9      _SelectableTextSelectionGestureDetectorBuilder.onSingleLongTapStart (package:flutter/src/material/selectable_text.dart:105:20)
#10     _TextSelectionGestureDetectorState._handleLongPressStart (package:flutter/src/widgets/text_selection.dart:3332:35)
#11     LongPressGestureRecognizer._checkLongPressStart.<anonymous closure> (package:flutter/src/gestures/long_press.dart:703:75)
#12     GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:344:24)
#13     LongPressGestureRecognizer._checkLongPressStart (package:flutter/src/gestures/long_press.dart:703:11)
#14     LongPressGestureRecognizer.didExceedDeadline (package:flutter/src/gestures/long_press.dart:607:5)
#15     PrimaryPointerGestureRecognizer.didExceedDeadlineWithEvent (package:flutter/src/gestures/recognizer.dart:724:5)
#16     PrimaryPointerGestureRecognizer.addAllowedPointer.<anonymous closure> (package:flutter/src/gestures/recognizer.dart:667:41)
#20     _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:184:12)
(elided 3 frames from class _Timer and dart:async-patch)
====================================================================================================
D/EGL_emulation(14808): app_time_stats: avg=9575.93ms min=10.24ms max=19141.63ms count=2

code sample


import 'package:flutter/material.dart';
import 'package:flutter_markdown/flutter_markdown.dart';

void main() => runApp(const App());

class App extends StatelessWidget {
  const App({super.key});

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      home: Scaffold(
        body: SelectionArea(
          child: Center(
            child: MarkdownBody(
              selectable: true,
              data: '''
# Hello, Markdown!

`sudo dnf install xorg-x11-xauth`

env XDG_SESSION_TYPE=x11

''',
            ),
          ),
        ),
      ),
    );
  }
}

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[flutter_markdown] Null check operator used on a null value in MarkdownBuilder._buildRichText.<fn>(builder.dart:957) about flutter HOT 6 OPEN

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