Flutter SingleChildScrollView中的ReorderableListView
我尝试在Flutter SingleChildScrollView中的ReorderableListView,flutter,flutter-layout,Flutter,Flutter Layout,我尝试在SingleChildScrollView中使用ReorderableListView,但收到一个错误: I/flutter ( 9049): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════ I/flutter ( 9049): The following assertion was thrown during performLayou
SingleChildScrollView
中使用ReorderableListView
,但收到一个错误:
I/flutter ( 9049): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
I/flutter ( 9049): The following assertion was thrown during performLayout():
I/flutter ( 9049): BoxConstraints forces an infinite height.
I/flutter ( 9049): These invalid constraints were provided to _RenderLayoutBuilder's layout() function by the following
I/flutter ( 9049): function, which probably computed the invalid constraints in question:
I/flutter ( 9049): RenderStack.performLayout (package:flutter/src/rendering/stack.dart:510:15)
I/flutter ( 9049): The offending constraints were:
I/flutter ( 9049): BoxConstraints(w=360.0, h=Infinity)
I/flutter ( 9049): User-created ancestor of the error-causing widget was:
I/flutter ( 9049): ReorderableListView file:///Users/vvv/Documents/Projects/WorkoutBook/lib/main.dart:43:12
I/flutter ( 9049): When the exception was thrown, this was the stack:
I/flutter ( 9049): #0 BoxConstraints.debugAssertIsValid.<anonymous closure>.throwError (package:flutter/src/rendering/box.dart:501:9)
I/flutter ( 9049): #1 BoxConstraints.debugAssertIsValid.<anonymous closure> (package:flutter/src/rendering/box.dart:548:21)
I/flutter ( 9049): #2 BoxConstraints.debugAssertIsValid (package:flutter/src/rendering/box.dart:552:6)
I/flutter ( 9049): #3 RenderObject.layout (package:flutter/src/rendering/object.dart:1618:24)
I/flutter ( 9049): #4 RenderStack.performLayout (package:flutter/src/rendering/stack.dart:510:15)
I/flutter ( 9049): #5 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #6 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #7 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #8 RenderFlex.performLayout (package:flutter/src/rendering/flex.dart:744:15)
I/flutter ( 9049): #9 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #10 _RenderSingleChildViewport.performLayout (package:flutter/src/widgets/single_child_scroll_view.dart:497:13)
I/flutter ( 9049): #11 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #12 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #13 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #14 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #15 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #16 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #17 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #18 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #19 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #20 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #21 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #22 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #23 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #24 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #25 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #26 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #27 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #28 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #29 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #30 MultiChildLayoutDelegate.layoutChild (package:flutter/src/rendering/custom_layout.dart:142:11)
I/flutter ( 9049): #31 _ScaffoldLayout.performLayout (package:flutter/src/material/scaffold.dart:444:7)
I/flutter ( 9049): #32 MultiChildLayoutDelegate._callPerformLayout (package:flutter/src/rendering/custom_layout.dart:212:7)
I/flutter ( 9049): #33 RenderCustomMultiChildLayoutBox.performLayout (package:flutter/src/rendering/custom_layout.dart:356:14)
I/flutter ( 9049): #34 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #35 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #36 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #37 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #38 _RenderCustomClip.performLayout (package:flutter/src/rendering/proxy_box.dart:1232:11)
I/flutter ( 9049): #39 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #40 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #41 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #42 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #43 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #44 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #45 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #46 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #47 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #48 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #49 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #50 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #51 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #52 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #53 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #54 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #55 RenderOffstage.performLayout (package:flutter/src/rendering/proxy_box.dart:3140:13)
I/flutter ( 9049): #56 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #57 RenderStack.performLayout (package:flutter/src/rendering/stack.dart:510:15)
I/flutter ( 9049): #58 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #59 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #60 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #61 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #62 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #63 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #64 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #65 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #66 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #67 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #68 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #69 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter ( 9049): #70 RenderObject.layout (package:flutter/src/rendering/object.dart:1701:7)
I/flutter ( 9049): #71 RenderView.performLayout (package:flutter/src/rendering/view.dart:152:13)
I/flutter ( 9049): #72 RenderObject._layoutWithoutResize (package:flutter/src/rendering/object.dart:1578:7)
I/flutter ( 9049): #73 PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:844:18)
I/flutter ( 9049): #74 RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:341:19)
I/flutter ( 9049): #75 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:761:13)
I/flutter ( 9049): #76 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:280:5)
I/flutter ( 9049): #77 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1033:15)
I/flutter ( 9049): #78 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:975:9)
I/flutter ( 9049): #79 SchedulerBinding.scheduleWarmUpFrame.<anonymous closure> (package:flutter/src/scheduler/binding.dart:784:7)
I/flutter ( 9049): #88 _Timer._runTimers (dart:isolate-patch/timer_impl.dart:382:19)
I/flutter ( 9049): #89 _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:416:5)
I/flutter ( 9049): #90 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:172:12)
I/flutter ( 9049): (elided 8 frames from package dart:async and package dart:async-patch)
I/flutter ( 9049): The following RenderObject was being processed when the exception was fired: RenderStack#68003 relayoutBoundary=up13 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE:
I/flutter ( 9049): creator: Stack ← _Theatre ← Overlay-[GlobalKey#e1f76 ReorderableListView overlay key] ←
I/flutter ( 9049): ReorderableListView ← NestedGroup ← Column ← _SingleChildViewport ←
I/flutter ( 9049): IgnorePointer-[GlobalKey#25797] ← Semantics ← _PointerListener ← Listener ← _GestureSemantics ← ⋯
I/flutter ( 9049): parentData: not positioned; offset=Offset(0.0, 0.0) (can use size)
I/flutter ( 9049): constraints: BoxConstraints(0.0<=w<=360.0, 0.0<=h<=Infinity)
I/flutter ( 9049): size: MISSING
I/flutter ( 9049): alignment: AlignmentDirectional.topStart
I/flutter ( 9049): textDirection: ltr
I/flutter ( 9049): fit: expand
I/flutter ( 9049): overflow: clip
I/flutter ( 9049): This RenderObject had the following child:
I/flutter ( 9049): child 1: _RenderLayoutBuilder#718b7 NEEDS-LAYOUT NEEDS-PAINT
示例代码:
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(),
body: Test(),
),
);
}
}
class Test extends StatelessWidget {
@override
Widget build(BuildContext context) {
return SingleChildScrollView(
child: Column(
children: <Widget>[Text('Scrollable Header'), NestedGroup()],
),
);
}
}
class NestedGroup extends StatelessWidget {
@override
Widget build(BuildContext context) {
return ReorderableListView(
children: List.generate(
10,
(position) => ListTile(
key: ValueKey(position),
title: Text("Dragable item $position"))),
onReorder: (d, dfd) {});
}
}
类MyApp扩展了无状态小部件{
@凌驾
小部件构建(构建上下文){
返回材料PP(
家:脚手架(
appBar:appBar(),
正文:Test(),
),
);
}
}
类测试扩展了无状态小部件{
@凌驾
小部件构建(构建上下文){
返回SingleChildScrollView(
子:列(
子项:[文本('Scrollable Header'),NestedGroup()],
),
);
}
}
类NestedGroup扩展了无状态小部件{
@凌驾
小部件构建(构建上下文){
返回ReorderableListView(
子项:List.generate(
10,
(位置)=>ListTile(
键:ValueKey(位置),
标题:文本(“可拖动项$position”),
onReorder:(d,dfd){};
}
}
Official Flatter的ReorderableListView
缺少常规ListView
确实具有的参数,以及您需要的参数-收缩包装:true
。这是一个好主意
如果没有此参数,您必须自己限制其高度(例如,将其包装在具有固定高度的容器中)或删除父可滚动(SingleChildScrollView)
或者你可以使用其他一些由社区制作的可重新排序的小部件,比如Or。来获得一个固定高度的动态列表,你可以将它放在一个容器中,容器的高度与你的列表相同。length*heightofeachement 例如:
Container(
/*If you don't the height to be bigger than the height of your screen
use MediaQuery.of(context).size.height.
You can add a -200 to the end if you don't want it to take up the whole
screen*/
constraints: BoxConstraints(
maxHeight: MediaQuery.of(context).size.height,
),
/*If each of the elements you are creating are 65 pixels high which sort
of fits a card widget or something similar...*/
height: yourList.length * 65.0,
child: ListView.builder(...)
我无法通过设计删除可滚动容器。我不能使用固定高度-它是一个动态列表=(@Vitaly然后你必须使用另一个类似的小部件。我在答案中留下了两个包。我个人在我的项目中使用了嵌套滚动条的
flatter\u reorderable\u list
,它比官方小部件好得多。据我所知,我试过了,它们也有同样的问题,但我会再试一次。谢谢
Container(
/*If you don't the height to be bigger than the height of your screen
use MediaQuery.of(context).size.height.
You can add a -200 to the end if you don't want it to take up the whole
screen*/
constraints: BoxConstraints(
maxHeight: MediaQuery.of(context).size.height,
),
/*If each of the elements you are creating are 65 pixels high which sort
of fits a card widget or something similar...*/
height: yourList.length * 65.0,
child: ListView.builder(...)