class PackagesPage extends StatefulWidget {
final DocumentSnapshot documentID;
final Firestore firestore;
PackagesPage({this.documentID, this.firestore});
@override
PackagesPageState createState() => PackagesPageState();
}
class PackagesPageState extends State<PackagesPage> {
@override
void initState(){
super.initState();
}
void showSnackBar(BuildContext context){
var snackBar = SnackBar(
content: Text("Voulez vous Acheter le service?"),
action: SnackBarAction(
label: "OUI",
onPressed: (){
PaiementStripe().buyService(priceService);
}
),
);
Scaffold.of(context).showSnackBar(snackBar);
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Services'),
backgroundColor: Colors.deepOrangeAccent[400],
),
floatingActionButton: FloatingActionButton(
heroTag: 'fab1',
onPressed: (){
showSnackBar(context);
},
child: Icon(
Icons.credit_card,
color: Colors.white),
backgroundColor: Colors.deepOrangeAccent,
),
body: ReviewService(),
);
}
}
class ReviewService extends StatelessWidget {
ReviewService({this.firestore, this.docID});
final Firestore firestore;
final String docID;
@override
Widget build(BuildContext context) {
return StreamBuilder<QuerySnapshot>(
stream: Firestore.instance.collection('hospital').document(docID).collection('services').snapshots(),
builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot){
if (!snapshot.hasData){
return const Text("Chargement...");
}
List<DocumentSnapshot> documents = snapshot.data.documents;
return ExpansionTileList(
firestore: firestore,
documents: documents,
docID: docID
);
},
);
}
}
class ExpansionTileList extends StatelessWidget{
final List<DocumentSnapshot> documents;
final String docID;
final Firestore firestore;
ExpansionTileList({this.firestore, this.documents,this.docID });
List<Widget> _getChildren(){
List<Widget> children= [];
documents.forEach((doc){
children.add(
ServiceExpansionTile(
name: doc['nom'],
serviceKey: doc.documentID,
firestore: firestore,
docID: docID
)
);
});
return children;
}
@override
Widget build(BuildContext context) {
// TODO: implement build
return ListView(
children: _getChildren(),
);
}
}
class ServiceExpansionTile extends StatelessWidget {
ServiceExpansionTile({this.serviceKey, this.name, this.firestore, this.docID });
final String serviceKey;
final String name;
final Firestore firestore;
final String docID;
@override
Widget build(BuildContext context) {
// TODO: implement build
PageStorageKey _serviceKey = PageStorageKey('$serviceKey');
return Scaffold(
body: ExpansionTile(
key: _serviceKey,
title: Text(
name,
style: TextStyle(
fontSize: 20.0,
fontWeight: FontWeight.bold
),
),
children: <Widget>[
StreamBuilder(
stream: Firestore.instance.collection('hospital')
.document(docID)
.collection('services')
.document(serviceKey)
.collection('details').snapshots(),
builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot){
if (!snapshot.hasData) return const Text('Chargement...');
List<DocumentSnapshot> documents = snapshot.data.documents;
List<Widget> detailsList = [];
documents.forEach((doc){
PageStorageKey _detailsKey = new PageStorageKey('${doc.documentID}');
detailsList.add(
ListTile(
key: _detailsKey,
leading: Icon(Icons.hotel),
title: Text(doc['nom']),
));
});
return Column(children: detailsList);
})
],
),
);
}
}
运行后，我在控制台日志中收到此消息：
══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
I/flutter (26849): The following assertion was thrown during performLayout():
I/flutter (26849): RenderCustomMultiChildLayoutBox object was given an infinite size during layout.
I/flutter (26849): This probably means that it is a render object that tries to be as big as possible, but it was put
I/flutter (26849): inside another render object that allows its children to pick their own size.
I/flutter (26849): The nearest ancestor providing an unbounded height constraint is:
I/flutter (26849): RenderIndexedSemantics#96d29 relayoutBoundary=up3 NEEDS-LAYOUT NEEDS-PAINT
I/flutter (26849): creator: IndexedSemantics ← NotificationListener<KeepAliveNotification> ← KeepAlive ←
I/flutter (26849): AutomaticKeepAlive ← SliverList ← MediaQuery ← SliverPadding ← Viewport ←
I/flutter (26849): IgnorePointer-[GlobalKey#663be] ← Semantics ← Listener ← _GestureSemantics ← ⋯
I/flutter (26849): parentData: index=0; layoutOffset=0.0 (can use size)
I/flutter (26849): constraints: BoxConstraints(w=392.7, 0.0<=h<=Infinity)
I/flutter (26849): semantic boundary
I/flutter (26849): size: MISSING
I/flutter (26849): index: 0
I/flutter (26849): The constraints that applied to the RenderCustomMultiChildLayoutBox were:
I/flutter (26849): BoxConstraints(w=392.7, 0.0<=h<=Infinity)
I/flutter (26849): The exact size it was given was:
I/flutter (26849): Size(392.7, Infinity)
I/flutter (26849): See https://flutter.io/layout/ for more information.
I/flutter (26849):
I/flutter (26849): When the exception was thrown, this was the stack:
I/flutter (26849): #0 RenderBox.debugAssertDoesMeetConstraints.<anonymous closure> (package:flutter/src/rendering/box.dart:1749:9)
I/flutter (26849): #1 RenderBox.debugAssertDoesMeetConstraints (package:flutter/src/rendering/box.dart:1823:6)
I/flutter (26849): #2 RenderBox.size=.<anonymous closure> (package:flutter/src/rendering/box.dart:1543:17)
I/flutter (26849): #3 RenderBox.size= (package:flutter/src/rendering/box.dart:1543:65)
I/flutter (26849): #4 RenderCustomMultiChildLayoutBox.performLayout (package:flutter/src/rendering/custom_layout.dart:355:5)
I/flutter (26849): #5 RenderObject.layout (package:flutter/src/rendering/object.dart:1632:7)
I/flutter (26849): #6 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (26849): #7 RenderObject.layout (package:flutter/src/rendering/object.dart:1632:7)
I/flutter (26849): #8 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (26849): #9 _RenderCustomClip.performLayout (package:flutter/src/rendering/proxy_box.dart:1206:11)
I/flutter (26849): #10 RenderObject.layout (package:flutter/src/rendering/object.dart:1632:7)
I/flutter (26849): #11 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (26849): #12 RenderObject.layout (package:flutter/src/rendering/object.dart:1632:7)
I/flutter (26849): #13 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (26849): #14 RenderObject.layout (package:flutter/src/rendering/object.dart:1632:7)
I/flutter (26849): #15 RenderSliverList.performLayout (package:flutter/src/rendering/sliver_list.dart:164:27)
I/flutter (26849): #16 RenderObject.layout (package:flutter/src/rendering/object.dart:1632:7)
I/flutter (26849): #17 RenderSliverPadding.performLayout (package:flutter/src/rendering/sliver_padding.dart:182:11)
I/flutter (26849): #18 RenderObject.layout (package:flutter/src/rendering/object.dart:1632:7)
I/flutter (26849): #19 RenderViewportBase.layoutChildSequence (package:flutter/src/rendering/viewport.dart:407:13)
I/flutter (26849): #20 RenderViewport._attemptLayout (package:flutter/src/rendering/viewport.dart:1322:12)
I/flutter (26849): #21 RenderViewport.performLayout (package:flutter/src/rendering/viewport.dart:1240:20)
I/flutter (26849): #22 RenderObject.layout (package:flutter/src/rendering/object.dart:1632:7)
I/flutter (26849): #23 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (26849): #24 RenderObject.layout (package:flutter/src/rendering/object.dart:1632:7)
I/flutter (26849): #25 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (26849): #26 RenderObject.layout (package:flutter/src/rendering/object.dart:1632:7)
I/flutter (26849): #27 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (26849): #28 RenderObject.layout (package:flutter/src/rendering/object.dart:1632:7)
I/flutter (26849): #29 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (26849): #30 RenderObject.layout (package:flutter/src/rendering/object.dart:1632:7)
I/flutter (26849): #31 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (26849): #32 RenderObject.layout (package:flutter/src/rendering/object.dart:1632:7)
I/flutter (26849): #33 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (26849): #34 RenderObject.layout (package:flutter/src/rendering/object.dart:1632:7)
I/flutter (26849): #35 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (26849): #36 RenderObject.layout (package:flutter/src/rendering/object.dart:1632:7)
I/flutter (26849): #37 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (26849): #38 RenderObject.layout (package:flutter/src/rendering/object.dart:1632:7)
I/flutter (26849): #39 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (26849): #40 RenderObject._layoutWithoutResize (package:flutter/src/rendering/object.dart:1507:7)
I/flutter (26849): #41 PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:766:18)
I/flutter (26849): #42 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:329:19)
I/flutter (26849): #43 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:701:13)
I/flutter (26849): #44 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:268:5)
I/flutter (26849): #45 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:988:15)
I/flutter (26849): #46 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:928:9)
I/flutter (26849): #47 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:840:5)
I/flutter (26849): #51 _invoke (dart:ui/hooks.dart:209:10)
I/flutter (26849): #52 _drawFrame (dart:ui/hooks.dart:168:3)
I/flutter (26849): (elided 3 frames from package dart:async)
I/flutter (26849):
I/flutter (26849): The following RenderObject was being processed when the exception was fired:
I/flutter (26849): RenderCustomMultiChildLayoutBox#170ff relayoutBoundary=up7 NEEDS-LAYOUT NEEDS-PAINT
I/flutter (26849): creator: CustomMultiChildLayout ← AnimatedBuilder ← DefaultTextStyle ← AnimatedDefaultTextStyle ←
I/flutter (26849): _InkFeatures-[GlobalKey#66af1 ink renderer] ← NotificationListener<LayoutChangedNotification> ←
I/flutter (26849): PhysicalModel ← AnimatedPhysicalModel ← Material ← PrimaryScrollController ← _ScaffoldScope ←
I/flutter (26849): Scaffold ← ⋯
I/flutter (26849): parentData: <none> (can use size)
I/flutter (26849): constraints: BoxConstraints(w=392.7, 0.0<=h<=Infinity)
I/flutter (26849): size: Size(392.7, Infinity)
I/flutter (26849): This RenderObject had the following descendants (showing up to depth 5):
I/flutter (26849): RenderDecoratedBox#d870a NEEDS-LAYOUT NEEDS-PAINT
I/flutter (26849): RenderPadding#14ba8 NEEDS-LAYOUT NEEDS-PAINT
I/flutter (26849): RenderFlex#6e752 NEEDS-LAYOUT NEEDS-PAINT
I/flutter (26849): RenderSemanticsGestureHandler#36b67 NEEDS-LAYOUT NEEDS-PAINT
I/flutter (26849): RenderPointerListener#cfb29 NEEDS-LAYOUT NEEDS-PAINT
I/flutter (26849): RenderClipRect#66eaf NEEDS-LAYOUT NEEDS-PAINT
I/flutter (26849): RenderPositionedBox#85283 NEEDS-LAYOUT NEEDS-PAINT
I/flutter (26849): RenderStack#057e0 NEEDS-LAYOUT NEEDS-PAINT
I/flutter (26849): RenderTransform#6ab00 NEEDS-LAYOUT NEEDS-PAINT
I/flutter (26849): RenderTransform#23709 NEEDS-LAYOUT NEEDS-PAINT
I/flutter (26849): ════════════════════════════════════════════════════════════════════════════════════════════════════
I/flutter (26849): Another exception was thrown: _RenderInkFeatures object was given an infinite size during layout.
I/flutter (26849): Another exception was thrown: RenderPhysicalModel object was given an infinite size during layout.
I/flutter (26849): Another exception was thrown: RenderRepaintBoundary object was given an infinite size during layout.
I/flutter (26849): Another exception was thrown: RenderIndexedSemantics object was given an infinite size during layout.
E/flutter (26849): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: Cannot hit test a render box that has never been laid out.
E/flutter (26849): The hitTest() method was called on this RenderBox:
E/flutter (26849): RenderStack#057e0 NEEDS-LAYOUT NEEDS-PAINT
E/flutter (26849): Unfortunately, this object's geometry is not known at this time, probably because it has never been laid out. This means it cannot be accurately hit-tested. If you are trying to perform a hit test during the layout phase itself, make sure you only hit test nodes that have completed layout (e.g. the node's children, after their layout() method has been called).
E/flutter (26849): #0 RenderBox.hitTest.<anonymous closure> (package:flutter/src/rendering/box.dart:1889:11)
E/flutter (26849): #1 RenderBox.hitTest (package:flutter/src/rendering/box.dart:1912:6)
E/flutter (26849): #2 _RenderCustomMultiChildLayoutBox&RenderBox&ContainerRenderObjectMixin&RenderBoxContainerDefaultsMixin.defaultHitTestChildren (package:flutter/src/rendering/box.dart:2256:17)
E/flutter (26849): #3 RenderCustomMultiChildLayoutBox.hitTestChildren (package:flutter/src/rendering/custom_layout.dart:366:12)
E/flutter (26849): #4 RenderBox.hitTest (package:flutter/src/rendering/box.dart:1914:11)
E/flutter (26849): #5 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:114:19)
E/flutter (26849): #6 RenderBox.hitTest (package:flutter/src/rendering/box.dart:1914:11)
E/flutter (26849): #7 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:114:19)
E/flutter (26849): #8 RenderBox.hitTest (package:flutter/src/rendering/box.dart:1914:11)
E/flutter (26849): #9 RenderPhysicalModel.hitTest (package:flutter/src/rendering/proxy_box.dart:1683:18)
E/flutter (26849): #10 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:114:19)
E/flutter (26849): #11 RenderBox.hitTest (package:flutter/src/rendering/box.dart:1914:11)
E/flutter (26849): #12 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:114:19)
E/flutter (26849): #13 RenderBox.hitTest (package:flutter/src/rendering/box.dart:1914:11)
E/flutter (26849): #14 _RenderSliverMultiBoxAdaptor&RenderSliver&ContainerRenderObjectMixin&RenderSliverHelpers.hitTestBoxChild (package:flutter/src/rendering/sliver.dart:1509:22)
E/flutter (26849): #15 RenderSliverMultiBoxAdaptor.hitTestChildren (package:flutter/src/rendering/sliver_multi_box_adaptor.dart:481:11)
E/flutter (26849): #16 RenderSliver.hitTest (package:flutter/src/rendering/sliver.dart:1171:11)
E/flutter (26849): #17 RenderSliverPadding.hitTestChildren (package:flutter/src/rendering/sliver_padding.dart:266:20)
E/flutter (26849): #18 RenderSliver.hitTest (package:flutter/src/rendering/sliver.dart:1171:11)
E/flutter (26849): #19 RenderViewportBase.hitTestChildren (package:flutter/src/rendering/viewport.dart:576:43)
E/flutter (26849): #20 RenderBox.hitTest (package:flutter/src/rendering/box.dart:1914:11)
E/flutter (26849): #21 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:114:19)
E/flutter (26849): #22 RenderBox.hitTest (package:flutter/src/rendering/box.dart:1914:11)
E/flutter (26849): #23 RenderIgnorePointer.hitTest (package:flutter/src/rendering/proxy_box.dart:2928:37)
E/flutter (26849): #24 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:114:19)
E/flutter (26849): #25 RenderBox.hitTest (package:flutter/src/rendering/box.dart:1914:11)
E/flutter (26849): #26 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:114:19)
E/flutter (26849): #27 RenderProxyBoxWithHitTestBehavior.hitTest (package:flutter/src/rendering/proxy_box.dart:161:19)
E/flutter (26849): #28 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:114:19)
E/flutter (26849): #29 RenderBox.hitTest (package:flutter/src/rendering/box.dart:1914:11)
E/flutter (26849): #30 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:114:19)
E/flutter (26849): #31 RenderBox.hitTest (package:flutter
请有人可以告诉我，并帮助我找到解决方法...
答案 0 :(得分：0)
错误消息提示您需要为列表设置大小。我知道这很模糊，但是您需要做的是用容器包装streamBuilder并给容器固定大小。这是因为您可能会因医院收集而产生许多对象，并且在渲染结果时超出范围时会发生抖动。做这样的事情...
Container(
height: 200,
child: StreamBuilder(...
几天前，animatedList也发生了类似的问题。让我知道怎么回事。