ProgressBar throws error when the parent is too small

[Wii42]

When the ProgressBarWidget is used, bot no value is specified (so the loading animation is shown), i get the following error with fluent_ui 4.7.7. Because of the error the progress bar is not displayed. Using fluent 4.7.6 or specifying a value in 4.7.7 seems to work fine with no error thrown.

Dart: 3.1.5
Flutter: 3.13.9

======== Exception caught by rendering library =====================================================
The following assertion was thrown during paint():
'package:flutter/src/foundation/math.dart': Failed assertion: line 12 pos 10: 'min <= max && !max.isNaN && !min.isNaN': is not true.

The relevant error-causing widget was: 
  ProgressBar ProgressBar:file:[...]
When the exception was thrown, this was the stack: 
2      clampDouble (package:flutter/src/foundation/math.dart:12:10)
3      OffsetExtension.clamp (package:fluent_ui/src/utils.dart:163:7)
4      _ProgressBarPainter.paint.drawLine (package:fluent_ui/src/controls/surfaces/progress_indicators.dart:183:17)
5      _ProgressBarPainter.paint (package:fluent_ui/src/controls/surfaces/progress_indicators.dart:199:5)
6      RenderCustomPaint._paintWithPainter (package:flutter/src/rendering/custom_paint.dart:573:13)
7      RenderCustomPaint.paint (package:flutter/src/rendering/custom_paint.dart:615:7)
8      RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3155:7)
9      PaintingContext.paintChild (package:flutter/src/rendering/object.dart:252:13)
10     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129:13)
11     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3155:7)
12     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:252:13)
13     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129:13)
14     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3155:7)
15     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:252:13)
16     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129:13)
17     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3155:7)
18     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:252:13)
19     _RenderLayoutBuilder.paint (package:flutter/src/widgets/layout_builder.dart:338:15)
20     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3155:7)
21     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:252:13)
22     RenderBoxContainerDefaultsMixin.defaultPaint (package:flutter/src/rendering/box.dart:2875:15)
23     RenderFlex.paint (package:flutter/src/rendering/flex.dart:1040:7)
24     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3155:7)
25     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:252:13)
26     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129:13)
27     RenderTransform.paint (package:flutter/src/rendering/proxy_box.dart:2555:17)
28     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3155:7)
29     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:252:13)
30     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129:13)
31     RenderAnimatedOpacityMixin.paint (package:flutter/src/rendering/proxy_box.dart:1060:11)
32     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3155:7)
33     PaintingContext._repaintCompositedChild (package:flutter/src/rendering/object.dart:168:11)
34     PaintingContext.repaintCompositedChild (package:flutter/src/rendering/object.dart:111:5)
35     PipelineOwner.flushPaint (package:flutter/src/rendering/object.dart:1144:31)
36     RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:496:19)
37     WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:918:13)
38     RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:360:5)
39     SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1297:15)
40     SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1227:9)
41     SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:1085:5)
42     _invoke (dart:ui/hooks.dart:170:13)
43     PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:401:5)
44     _drawFrame (dart:ui/hooks.dart:140:31)
(elided 2 frames from class _AssertionError)
The following RenderObject was being processed when the exception was fired: RenderCustomPaint#14dfb
...  parentData: <none> (can use size)
...  constraints: BoxConstraints(w=945.6, h=0.0)
...  size: Size(945.6, 0.0)
...  painter: _ProgressBarPainter#8b3d1()
RenderObject: RenderCustomPaint#14dfb
  parentData: <none> (can use size)
  constraints: BoxConstraints(w=945.6, h=0.0)
  size: Size(945.6, 0.0)
  painter: _ProgressBarPainter#8b3d1()

[bdlukaa]

Sorry, but I can not reproduce this issue on the example app. Can you try it there? Is there any reproducible snippet I can try? Are you trying on Flutter Web?

[Wii42]

It seems like i missidentified the situation where the bug happens a bit.
It only seems to occur when the ProgressBar is placed within a SizedBox with height between 0 and 2, when this SizedBox is then placed in a Column, as shown in the code snippet below.

This minimal app runs fine on fluent_ui 4.7.6 but it throws the above mentioned error when using fluent_ui 4.7.7 or later.

import 'package:fluent_ui/fluent_ui.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});
  @override
  Widget build(BuildContext context) {
    return const FluentApp(
      home: MyHomePage(),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return const NavigationView(
      content: Column(
        children: [
          SizedBox(
            height: 2,
            child: ProgressBar(),
          ),
        ],
      ),
    );
  }
}

If value in ProgressBar is specified or not seems to make no difference, contrary to my initial comment.

I hope this helps:)