Some functions broken after navigating through 31 of March (Europe DST date) about kalender

[werner-scholtz]

Thanks I was able to replicate the issues by changing my timezone, I cannot fix it right now but should be able to fix it this weekend or next.

[kluverua]

Thank you! Much better now!
but some little problems persist...
Case
Open: https://werner-scholtz.github.io/kalender/
In "date picker" set the date to 01.04.2024 and click "Ok"
expected to see 01/04/2024 date
but for now I see 31/03/2024

[werner-scholtz]

That is weird I can't seem to reproduce it. Is the view configuration setup like this ?

[kluverua]

I don't change any settings.
Enable Reschedule = true
Enable Resize = true

Kalender.Example.-.Google.Chrome.2024-03-05.15-34-42.mp4

[kluverua]

It reproduced in my project on Android/iOS
Here is some stack trace from my project, maybe it can help

══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞════════════════════════════════════════════
The following assertion was thrown during performLayout():
BoxConstraints forces an infinite width.
These invalid constraints were provided to RenderStack's layout() function by the following
function, which probably computed the invalid constraints in question:
  RenderStack.layoutPositionedChild (package:flutter/src/rendering/stack.dart:516:11)
The offending constraints were:
  BoxConstraints(w=Infinity, h=1008.0)

The relevant error-causing widget was:
  Stack
  Stack:file:///C:/Users/*/lib/src/views/multi_day_view/multi_day_page_content.dart:162:20

When the exception was thrown, this was the stack:
#0      BoxConstraints.debugAssertIsValid.<anonymous closure>.throwError (package:flutter/src/rendering/box.dart:519:9)
#1      BoxConstraints.debugAssertIsValid.<anonymous closure> (package:flutter/src/rendering/box.dart:569:11)
#2      BoxConstraints.debugAssertIsValid (package:flutter/src/rendering/box.dart:577:6)
#3      RenderObject.layout (package:flutter/src/rendering/object.dart:2439:24)
#4      RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#5      RenderStack.layoutPositionedChild (package:flutter/src/rendering/stack.dart:516:11)
#6      RenderStack.performLayout (package:flutter/src/rendering/stack.dart:621:30)
#7      RenderObject.layout (package:flutter/src/rendering/object.dart:2546:7)
#8      RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#9      _RenderLayoutBuilder.performLayout (package:flutter/src/widgets/layout_builder.dart:310:14)
#10     RenderObject.layout (package:flutter/src/rendering/object.dart:2546:7)
#11     RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#12     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:21)
#13     RenderObject.layout (package:flutter/src/rendering/object.dart:2546:7)
#14     RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#15     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:21)
#16     RenderObject.layout (package:flutter/src/rendering/object.dart:2546:7)
#17     RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#18     RenderSliverFixedExtentBoxAdaptor.performLayout (package:flutter/src/rendering/sliver_fixed_extent_list.dart:309:19)
#19     RenderObject.layout (package:flutter/src/rendering/object.dart:2546:7)
#20     RenderSliverEdgeInsetsPadding.performLayout (package:flutter/src/rendering/sliver_padding.dart:139:12)
#21     _RenderSliverFractionalPadding.performLayout (package:flutter/src/widgets/sliver_fill.dart:160:11)
#22     RenderObject.layout (package:flutter/src/rendering/object.dart:2546:7)
#23     RenderViewportBase.layoutChildSequence (package:flutter/src/rendering/viewport.dart:601:13)
#24     RenderViewport._attemptLayout (package:flutter/src/rendering/viewport.dart:1554:12)
#25     RenderViewport.performLayout (package:flutter/src/rendering/viewport.dart:1463:20)
#26     RenderObject.layout (package:flutter/src/rendering/object.dart:2546:7)
#27     RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#28     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:21)
#29     RenderObject.layout (package:flutter/src/rendering/object.dart:2546:7)
#30     RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#31     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:21)
#32     RenderObject.layout (package:flutter/src/rendering/object.dart:2546:7)
#33     RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#34     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:21)
#35     RenderObject.layout (package:flutter/src/rendering/object.dart:2546:7)
#36     RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#37     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:21)
#38     RenderObject.layout (package:flutter/src/rendering/object.dart:2546:7)
#39     RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#40     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:21)
#41     RenderObject.layout (package:flutter/src/rendering/object.dart:2546:7)
#42     RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#43     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:21)
#44     RenderObject.layout (package:flutter/src/rendering/object.dart:2546:7)
#45     RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#46     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:21)
#47     RenderObject.layout (package:flutter/src/rendering/object.dart:2546:7)
#48     RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#49     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:21)
#50     RenderCustomPaint.performLayout (package:flutter/src/rendering/custom_paint.dart:569:11)
#51     RenderObject.layout (package:flutter/src/rendering/object.dart:2546:7)
#52     RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#53     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:21)
#54     RenderObject.layout (package:flutter/src/rendering/object.dart:2546:7)
#55     RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#56     RenderStack.layoutPositionedChild (package:flutter/src/rendering/stack.dart:516:11)
#57     RenderStack.performLayout (package:flutter/src/rendering/stack.dart:621:30)
#58     RenderObject._layoutWithoutResize (package:flutter/src/rendering/object.dart:2385:7)
#59     PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:1025:18)
#60     PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:1038:15)
#61     RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:591:23)
#62     WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:986:13)
#63     RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:457:5)
#64     SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1325:15)
#65     SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1255:9)
#66     SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:1113:5)
#70     _invoke (dart:ui/hooks.dart:314:10)
#71     PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:383:5)
#72     _drawFrame (dart:ui/hooks.dart:283:31)
(elided 3 frames from dart:async)

[kluverua]

I found problem

\lib\src\extensions.dart:10

start.startOfDay.difference(end.endOfDay).inDays //returns 1 instead of 2
In case when
start = 2024-03-30 00:00:00.000
end = 2024-03-31 00:00:00.000

because of Daylight saving time (DST)
because start.startOfDay.difference(end.endOfDay).inHours = 47 hours instead of 48 hours

here is possible workaround:

final startDay = DateTime.utc(start.year, start.month, start.day);
final endDay = DateTime.utc(end.year, end.month, end.day);
return (endDay - startDay).inDays;

P.S. I think this is not the only place where this error occurs and need to check all other places

[werner-scholtz]

Hi thanks for bringing this to my attention I don't experience daylight savings myself and for debugging will take a closer look at this.

[kluverua]

Here is another example, select the Custom period (in fact it is 2 days) and select the date March 29-30
we see that only one column is drawn

[werner-scholtz]

Hi should be fixed now.

[werner-scholtz]

Time to write some more tests 🧪