我试图创建一个显示列表中多个项目的窗口小部件，并使用其他窗口小部件（包括自定义窗口小部件）来显示这些项目
这是结构：
TriesWidget
-- Container
------ TryWidget
-------- Row
---------- IconButton
---------- CombinationWidget
------------ Row
-------------- ListView
---------------- ... (Container)
这是应用程序的工作代码，只有一项（最后一项）
class TriesWidget extends StatefulWidget {
final Mastermind mastermind;
TriesWidget({Key key, @required this.mastermind}) : super(key: key);
@override
_TriesWidgetState createState() => _TriesWidgetState();
}
class _TriesWidgetState extends State<TriesWidget> {
void _handleButtonPressed(bool newValue) {
setState(() {
widget.mastermind.checkLastTry();
});
}
@override
Widget build(BuildContext context) {
return Container(
child: TryWidget(
tryModel: widget.mastermind.tries.last,
onChanged: _handleButtonPressed
),
);
}
}
class TryWidget extends StatelessWidget {
TryWidget({Key key, @required this.tryModel, @required this.onChanged}) : super(key: key);
final ValueChanged<bool> onChanged;
final Try tryModel;
void _handlePressed() {
onChanged(true);
}
Widget build(BuildContext context) {
return Row(
children: <Widget>[
CombinationWidget( combination: tryModel.tryCode),
IconButton(
iconSize: 50,
onPressed: _handlePressed,
icon: Icon(Icons.check_circle, color: Colors.lightGreen,),
),
],
);
}
}
class CombinationWidget extends StatefulWidget {
final Combination combination;
CombinationWidget({Key key, @required this.combination}) : super(key: key);
@override
_CombinationWidgetState createState() => _CombinationWidgetState();
}
class _CombinationWidgetState extends State<CombinationWidget> {
@override
Widget build(BuildContext context) {
return Row(
mainAxisSize: MainAxisSize.min,
children: [
ListView.builder(
shrinkWrap: true,
itemCount: Settings.codeLength,
scrollDirection: Axis.horizontal,
itemBuilder: (context, position)
{
return GestureDetector(
onTap: () => _modifyCode(position),
child: new PegItem(pegModel: widget.combination[position]),
);
}
),
],
);
}
void _modifyCode(int position)
{
setState(()
{
Mastermind.modifyCode(widget.combination, position);
});
}
}
这是应该产生我预期结果（显示所有项目）的代码：
class TriesWidget extends StatefulWidget {
final Mastermind mastermind;
TriesWidget({Key key, @required this.mastermind}) : super(key: key);
@override
_TriesWidgetState createState() => _TriesWidgetState();
}
class _TriesWidgetState extends State<TriesWidget> {
void _handleButtonPressed(bool newValue) {
setState(() {
widget.mastermind.checkLastTry();
});
}
@override
Widget build(BuildContext context) {
return Container(
height: double.maxFinite,
child: ListView.builder(
itemCount: widget.mastermind.tries.length,
shrinkWrap: true,
itemBuilder: (BuildContext context, int index) {
return new TryWidget(
tryModel: widget.mastermind.tries.elementAt(index),
onChanged: _handleButtonPressed
);
}
),
);
}
}
及其产生的错误：
════════ Exception caught by rendering library ═════════════════════════════════════════════════════
The following assertion was thrown during performLayout():
'package:flutter/src/rendering/viewport.dart': Failed assertion: line 1634 pos 16: 'constraints.hasBoundedHeight': is not true.
Either the assertion indicates an error in the framework itself, or we should provide substantially more information in this error message to help you determine and fix the underlying cause.
In either case, please report this assertion by filing a bug on GitHub:
https://github.com/flutter/flutter/issues/new?template=BUG.md
User-created ancestor of the error-causing widget was:
ListView file:///C:/Users/TBG/Repositories/CPE-S7_MPA_Mastermind/FlutterTest/flutter_app/lib/widgets/combination.widget.dart:25:18
When the exception was thrown, this was the stack:
#2 RenderShrinkWrappingViewport.performLayout (package:flutter/src/rendering/viewport.dart:1634:16)
#3 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
#4 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
#5 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
#6 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
...
The following RenderObject was being processed when the exception was fired: RenderShrinkWrappingViewport#f596e relayoutBoundary=up28 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
... needs compositing
... parentData: <none> (can use size)
... constraints: BoxConstraints(unconstrained)
... size: MISSING
... axisDirection: right
... crossAxisDirection: down
... offset: ScrollPositionWithSingleContext#ee282(offset: 0.0, range: null..null, viewport: null, ScrollableState, ClampingScrollPhysics, IdleScrollActivity#4b904, ScrollDirection.idle)
RenderObject: RenderShrinkWrappingViewport#f596e relayoutBoundary=up28 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
needs compositing
parentData: <none> (can use size)
constraints: BoxConstraints(unconstrained)
size: MISSING
axisDirection: right
crossAxisDirection: down
offset: ScrollPositionWithSingleContext#ee282(offset: 0.0, range: null..null, viewport: null, ScrollableState, ClampingScrollPhysics, IdleScrollActivity#4b904, ScrollDirection.idle)
... child 0: RenderSliverPadding#5928b NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
... parentData: layoutOffset=0.0
... constraints: MISSING
... geometry: null
... padding: EdgeInsets.zero
... textDirection: ltr
... child: RenderSliverList#44c1f NEEDS-LAYOUT NEEDS-PAINT
... parentData: paintOffset=Offset(0.0, 0.0)
... constraints: MISSING
... geometry: null
... no children current live
════════════════════════════════════════════════════════════════════════════════════════════════════
════════ (2) Exception caught by rendering library ═════════════════════════════════════════════════
RenderBox was not laid out: RenderShrinkWrappingViewport#f596e relayoutBoundary=up28 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
'package:flutter/src/rendering/box.dart':
Failed assertion: line 1681 pos 12: 'hasSize'
User-created ancestor of the error-causing widget was:
ListView file:///C:/Users/TBG/Repositories/CPE-S7_MPA_Mastermind/FlutterTest/flutter_app/lib/widgets/combination.widget.dart:25:18
════════════════════════════════════════════════════════════════════════════════════════════════════
[...]
════════ (28) Exception caught by rendering library ════════════════════════════════════════════════
RenderBox was not laid out: RenderConstrainedBox#ac5d6 relayoutBoundary=up2 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
'package:flutter/src/rendering/box.dart':
Failed assertion: line 1681 pos 12: 'hasSize'
User-created ancestor of the error-causing widget was:
Scaffold file:///C:/Users/TBG/Repositories/CPE-S7_MPA_Mastermind/FlutterTest/flutter_app/lib/widgets/mastermind.widget.dart:21:12
════════════════════════════════════════════════════════════════════════════════════════════════════
════════ (29) Exception caught by rendering library ════════════════════════════════════════════════
RenderBox was not laid out: RenderFlex#faa61 relayoutBoundary=up1 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
'package:flutter/src/rendering/box.dart':
Failed assertion: line 1681 pos 12: 'hasSize'
User-created ancestor of the error-causing widget was:
Scaffold file:///C:/Users/TBG/Repositories/CPE-S7_MPA_Mastermind/FlutterTest/flutter_app/lib/widgets/mastermind.widget.dart:21:12
════════════════════════════════════════════════════════════════════════════════════════════════════
════════ (30) Exception caught by rendering library ════════════════════════════════════════════════
The method '>' was called on null.
Receiver: null
Tried calling: >(1e-10)
User-created ancestor of the error-causing widget was:
Scaffold file:///C:/Users/TBG/Repositories/CPE-S7_MPA_Mastermind/FlutterTest/flutter_app/lib/widgets/mastermind.widget.dart:21:12
════════════════════════════════════════════════════════════════════════════════════════════════════
我在线尝试了许多解决方案（添加收缩，约束，固定高度，使用Expanded等），但找不到问题及其解决方法