I'm trying to integrate this library into my project and I want to let users choose items from a list or add their own items to it. Here is what I have so far:
final GlobalKey<TagsState> _tagStateKey = GlobalKey<TagsState>();
List<String> _existingTopics = ['religion', 'politics', 'literature'];
List<String> _topics = [];
...
Tags(
key: _tagStateKey,
textField: TagsTextField(
constraintSuggestion: true,
suggestions: _existingTopics,
//width: double.infinity, padding: EdgeInsets.symmetric(horizontal: 10),
onSubmitted: (String str) {
// Add item to the data source.
setState(() {
// required
_topics.add(str);
});
},
),
itemCount: _topics.length, // required
itemBuilder: (int index) {
final topic = _topics[index];
return ItemTags(
// Each ItemTags must contain a Key. Keys allow Flutter to
// uniquely identify widgets.
key: Key(index.toString()),
index: index, // required
title: topic,
combine: ItemTagsCombine.withTextBefore,
image: null,
icon: null,
removeButton: ItemTagsRemoveButton(
onRemoved: () {
// Remove the item from the data source.
setState(() {
_topics.removeAt(index);
});
return true;
},
),
);
},
)
But when I start typing one of the _existingTopics and then type the submit button on the iOS keyboard, I see this:
And I get the following exception:
[+165250 ms] flutter: ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
[ +2 ms] flutter: The following _CastError was thrown building ItemTags-[<'0'>](dirty, dependencies:
[ ] flutter: [DataListInherited], state: _ItemTagsState#81225):
[ ] flutter: type 'Null' is not a subtype of type 'DataList' in type cast
[ ] flutter:
[ ] flutter: The relevant error-causing widget was:
[ +8 ms] flutter: ItemTags-[<'0'>] file:///Users/sarbogast/dev/blindly/blindly/lib/screens/topics_screen.dart:108:28
[ ] flutter:
[ ] flutter: When the exception was thrown, this was the stack:
[ ] flutter: #0 List.length= (dart:core-patch/growable_array.dart:222:12)
[ ] flutter: #1 _ItemTagsState._setDataList (package:flutter_tags/src/item_tags.dart:153:33)
[ ] flutter: #2 _ItemTagsState.build (package:flutter_tags/src/item_tags.dart:214:5)
[ ] flutter: #3 StatefulElement.build (package:flutter/src/widgets/framework.dart:4612:27)
[ ] flutter: #4 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4495:15)
[ ] flutter: #5 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4667:11)
[ ] flutter: #6 Element.rebuild (package:flutter/src/widgets/framework.dart:4189:5)
[ ] flutter: #7 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:4474:5)
[ ] flutter: #8 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4658:11)
[ ] flutter: #9 ComponentElement.mount (package:flutter/src/widgets/framework.dart:4469:5)
[ ] flutter: #10 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3541:14)
[ ] flutter: #11 Element.updateChild (package:flutter/src/widgets/framework.dart:3306:18)
[ ] flutter: #12 RenderObjectElement.updateChildren (package:flutter/src/widgets/framework.dart:5561:32)
[ ] flutter: #13 MultiChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6105:17)
[ ] flutter: #14 Element.updateChild (package:flutter/src/widgets/framework.dart:3293:15)
[ ] flutter: #15 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4520:16)
[ +16 ms] flutter: #16 Element.rebuild (package:flutter/src/widgets/framework.dart:4189:5)
[ ] flutter: #17 ProxyElement.update (package:flutter/src/widgets/framework.dart:4843:5)
[ ] flutter: #18 Element.updateChild (package:flutter/src/widgets/framework.dart:3293:15)
[ ] flutter: #19 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4520:16)
[ ] flutter: #20 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4667:11)
[ ] flutter: #21 Element.rebuild (package:flutter/src/widgets/framework.dart:4189:5)
[ ] flutter: #22 StatefulElement.update (package:flutter/src/widgets/framework.dart:4699:5)
[ ] flutter: #23 Element.updateChild (package:flutter/src/widgets/framework.dart:3293:15)
[ ] flutter: #24 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4520:16)
[ ] flutter: #25 Element.rebuild (package:flutter/src/widgets/framework.dart:4189:5)
[ ] flutter: #26 ProxyElement.update (package:flutter/src/widgets/framework.dart:4843:5)
[ ] flutter: #27 Element.updateChild (package:flutter/src/widgets/framework.dart:3293:15)
[ ] flutter: #28 RenderObjectElement.updateChildren (package:flutter/src/widgets/framework.dart:5503:32)
[ ] flutter: #29 MultiChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6105:17)
[ ] flutter: #30 Element.updateChild (package:flutter/src/widgets/framework.dart:3293:15)
[ ] flutter: #31 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5981:14)
[ ] flutter: #32 Element.updateChild (package:flutter/src/widgets/framework.dart:3293:15)
[ ] flutter: #33 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4520:16)
[ ] flutter: #34 Element.rebuild (package:flutter/src/widgets/framework.dart:4189:5)
[ ] flutter: #35 ProxyElement.update (package:flutter/src/widgets/framework.dart:4843:5)
[ ] flutter: #36 Element.updateChild (package:flutter/src/widgets/framework.dart:3293:15)
[ ] flutter: #37 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5981:14)
[ ] flutter: #38 Element.updateChild (package:flutter/src/widgets/framework.dart:3293:15)
[ ] flutter: #39 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4520:16)
[ ] flutter: #40 Element.rebuild (package:flutter/src/widgets/framework.dart:4189:5)
[ ] flutter: #41 StatelessElement.update (package:flutter/src/widgets/framework.dart:4576:5)
[ ] flutter: #42 Element.updateChild (package:flutter/src/widgets/framework.dart:3293:15)
[ ] flutter: #43 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4520:16)
[ ] flutter: #44 Element.rebuild (package:flutter/src/widgets/framework.dart:4189:5)
[ ] flutter: #45 StatelessElement.update (package:flutter/src/widgets/framework.dart:4576:5)
[ ] flutter: #46 Element.updateChild (package:flutter/src/widgets/framework.dart:3293:15)
[ ] flutter: #47 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4520:16)
[ ] flutter: #48 Element.rebuild (package:flutter/src/widgets/framework.dart:4189:5)
[ ] flutter: #49 ProxyElement.update (package:flutter/src/widgets/framework.dart:4843:5)
[ ] flutter: #50 Element.updateChild (package:flutter/src/widgets/framework.dart:3293:15)
[ ] flutter: #51 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4520:16)
[ ] flutter: #52 Element.rebuild (package:flutter/src/widgets/framework.dart:4189:5)
[ ] flutter: #53 ProxyElement.update (package:flutter/src/widgets/framework.dart:4843:5)
[ ] flutter: #54 Element.updateChild (package:flutter/src/widgets/framework.dart:3293:15)
[ ] flutter: #55 RenderObjectElement.updateChildren (package:flutter/src/widgets/framework.dart:5503:32)
[ ] flutter: #56 MultiChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6105:17)
[ ] flutter: #57 Element.updateChild (package:flutter/src/widgets/framework.dart:3293:15)
[ ] flutter: #58 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4520:16)
[ ] flutter: #59 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4667:11)
[ ] flutter: #60 Element.rebuild (package:flutter/src/widgets/framework.dart:4189:5)
[ ] flutter: #61 StatefulElement.update (package:flutter/src/widgets/framework.dart:4699:5)
[ ] flutter: #62 Element.updateChild (package:flutter/src/widgets/framework.dart:3293:15)
[ ] flutter: #63 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4520:16)
[ ] flutter: #64 Element.rebuild (package:flutter/src/widgets/framework.dart:4189:5)
[ ] flutter: #65 ProxyElement.update (package:flutter/src/widgets/framework.dart:4843:5)
[ +17 ms] flutter: #66 Element.updateChild (package:flutter/src/widgets/framework.dart:3293:15)
[ ] flutter: #67 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4520:16)
[ ] flutter: #68 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4667:11)
[ ] flutter: #69 Element.rebuild (package:flutter/src/widgets/framework.dart:4189:5)
[ ] flutter: #70 StatefulElement.update (package:flutter/src/widgets/framework.dart:4699:5)
[ ] flutter: #71 Element.updateChild (package:flutter/src/widgets/framework.dart:3293:15)
[ ] flutter: #72 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5981:14)
[ ] flutter: #73 Element.updateChild (package:flutter/src/widgets/framework.dart:3293:15)
[ ] flutter: #74 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4520:16)
[ ] flutter: #75 Element.rebuild (package:flutter/src/widgets/framework.dart:4189:5)
[ ] flutter: #76 StatelessElement.update (package:flutter/src/widgets/framework.dart:4576:5)
[ ] flutter: #77 Element.updateChild (package:flutter/src/widgets/framework.dart:3293:15)
[ ] flutter: #78 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5981:14)
[ ] flutter: #79 Element.updateChild (package:flutter/src/widgets/framework.dart:3293:15)
[ ] flutter: #80 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4520:16)
[ ] flutter: #81 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4667:11)
[ ] flutter: #82 Element.rebuild (package:flutter/src/widgets/framework.dart:4189:5)
[ ] flutter: #83 StatefulElement.update (package:flutter/src/widgets/framework.dart:4699:5)
[ ] flutter: #84 Element.updateChild (package:flutter/src/widgets/framework.dart:3293:15)
[ ] flutter: #85 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4520:16)
[ ] flutter: #86 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4667:11)
[ ] flutter: #87 Element.rebuild (package:flutter/src/widgets/framework.dart:4189:5)
[ ] flutter: #88 StatefulElement.update (package:flutter/src/widgets/framework.dart:4699:5)
[ ] flutter: #89 Element.updateChild (package:flutter/src/widgets/framework.dart:3293:15)
[ ] flutter: #90 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4520:16)
[ ] flutter: #91 Element.rebuild (package:flutter/src/widgets/framework.dart:4189:5)
[ ] flutter: #92 ProxyElement.update (package:flutter/src/widgets/framework.dart:4843:5)
[ ] flutter: #93 Element.updateChild (package:flutter/src/widgets/framework.dart:3293:15)
[ ] flutter: #94 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4520:16)
[ ] flutter: #95 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4667:11)
[ ] flutter: #96 Element.rebuild (package:flutter/src/widgets/framework.dart:4189:5)
[ ] flutter: #97 StatefulElement.update (package:flutter/src/widgets/framework.dart:4699:5)
[ ] flutter: #98 Element.updateChild (package:flutter/src/widgets/framework.dart:3293:15)
[ ] flutter: #99 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4520:16)
[ ] flutter: #100 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4667:11)
[ ] flutter: #101 Element.rebuild (package:flutter/src/widgets/framework.dart:4189:5)
[ ] flutter: #102 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2694:33)
[ ] flutter: #103 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:873:21)
[ ] flutter: #104 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:319:5)
[ ] flutter: #105 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1144:15)
[ ] flutter: #106 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1082:9)
[ ] flutter: #107 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:998:5)
[ ] flutter: #111 _invoke (dart:ui/hooks.dart:161:10)
[ ] flutter: #112 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:253:5)
[ ] flutter: #113 _drawFrame (dart:ui/hooks.dart:120:31)
[ ] flutter: (elided 3 frames from dart:async)
And the component crashes. Did I forget something?
Note that I am using Flutter 2.0.5 with null safety, along with version 1.0.0-nullsafety.1 of the flutter_tags library
I'm trying to integrate this library into my project and I want to let users choose items from a list or add their own items to it. Here is what I have so far:
But when I start typing one of the _existingTopics and then type the submit button on the iOS keyboard, I see this:
And I get the following exception:
And the component crashes. Did I forget something?
Note that I am using Flutter 2.0.5 with null safety, along with version 1.0.0-nullsafety.1 of the flutter_tags library