问题描述
我有一个多个StatefulWidget作为列表，并且我在StatefulWidget中进行导航，但是运行不正确，而是将控件附加到另一个中。
所有小部件代码的容器：
t2import 'dart:collection';
class FormContainerPage extends StatefulWidget {
final bool isInternal;
final MainEntityListModel entity;
static final List<Attachmentimage> imageList = List<Attachmentimage>();
static final LinkedHashMap<String,dynamic> listData = new LinkedHashMap();
FormContainerPage({this.isInternal,this.entity});
@override
_FormContainerPageState createState() => _FormContainerPageState();
}
class _FormContainerPageState extends State<FormContainerPage>
implements AlertDialogCallBack,LoaderCallBack {
final Utility _utility = new Utility();
List<Widget> _fragments = List<Widget>();
int _currentIndex = 0;
final List<int> _backStack = [0];
Widget _backImage;
Widget _nextimage;
ProgressBar _sendingMsgProgressBar;
bool _certifyCheckBox = false;
@override
void initState() {
super.initState();
_sendingMsgProgressBar = ProgressBar();
}
@override
void dispose() {
_sendingMsgProgressBar.hide();
super.dispose();
}
@override
Widget build(BuildContext context) {
return new BlocListener<FormContainerPageBloc,FormContainerPageState>(
listener: (context,state) {
if (state is FormContainerPageFailure) {
Scaffold.of(context).showSnackBar(
SnackBar(
content: Text('${state.error}'),backgroundColor: Colors.red,),);
}
},child: BlocBuilder<FormContainerPageBloc,FormContainerPageState>(
builder: (context,state) {
if (state is FormContainerFormloaded) {
_getListings(state.formDataList);
return WillPopScope(
onWillPop: () {
return customPop(context);
},child: Scaffold(
appBar: PreferredSize(
preferredSize: Size.fromHeight(AppBar().preferredSize.height),child: AppBar(
backgroundColor: Colors.white,automaticallyImplyLeading: false,centerTitle: true,elevation: 2,title: FutureBuilder(
future: null,builder: (context,snapshot) {
_setimages(context);
return Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,children: <Widget>[
_backImage,Text(
widget.entity.entityName,style: TextStyle(
fontFamily: _utility.langID == 1
? 'regularaR'
: 'regular',color: Constant.companyColors[2],fontSize: 18,_nextimage,],);
}),body: Column(
children: [
Expanded(
child: _fragments[_currentIndex],bottomSheet: CheckBoxListTile(
title: Container(
constraints: new BoxConstraints(
maxWidth: MediaQuery.of(context).size.width - 60),child: Text(
S.of(context).certifying_statement,style: TextStyle(fontFamily: 'regular'),controlAffinity: ListTileControlAffinity.leading,onChanged: (bool value) {
setState(() {
if (value != null) {
_certifyCheckBox = value;
} else {
_certifyCheckBox = false;
}
});
},tristate: true,value: _certifyCheckBox,);
} else {
return _utility.getLoadingIndicator();
}
},);
}
_getListings(List<FormData> formDataList) async{
int i = 0;
for (i = 0; i < formDataList.length; i++) {
FormData datafield = formDataList[i];
if (datafield.isAttachmentTab) {
_fragments.add(
new AttachmentPage(formData: datafield),);
} else {
_fragments.add(new BlocProvider<DynamicPageBloc>(
create: (context) => new DynamicPageBloc()
..add(new LoadForm(
appEntityID: widget.entity.appEntityID,formData: datafield)),child: new DynamicPage(formData: datafield,entity: widget.entity),));
}
}
}
void navigateto(BuildContext context,int index,String type) {
Widget _widget = _fragments[index];
bool attachmentEmptyError = false;
switch (type) {
case "NEXT":
{
if (_currentIndex == _fragments.length - 1) {
if (_widget is BlocProvider<DynamicPageBloc>) {
String data = (_widget.child as DynamicPage)
.child
.checkData((_widget.child as DynamicPage).listings);
if (data == "SUCCESS") {
if (_certifyCheckBox) {
callServiceConfirmation(
context,S.of(context).createEntity_confirmation_message,S.of(context).createEntity_confirmation_title);
} else {
_utility.showToast(context,S.of(context).certifying_error);
}
}
}
} else {
if (_widget is AttachmentPage) {
var child = _widget.child;
String data = child.checkData();
if (data == "SUCCESS") {
attachmentEmptyError = false;
} else {
attachmentEmptyError = true;
}
if (attachmentEmptyError) {
_utility.showToast(context,"Attachment empty");
} else {
_backStack.add(index);
setState(() {
_currentIndex++;
});
_setimages(context);
}
} else if (_widget is BlocProvider<DynamicPageBloc>) {
if (_widget is BlocProvider<DynamicPageBloc>) {
String data = (_widget.child as DynamicPage)
.child
.checkData((_widget.child as DynamicPage).listings);
if (data == "SUCCESS") {
_backStack.add(index);
setState(() {
_currentIndex++;
});
_setimages(context);
}
}
}
}
}
break;
case "BACK":
{
if (_currentIndex == 0) {
_utility.shoAlertDialog(
context,"Quit theForm","Are you sure you want to Quit " +
widget.entity.entityName +
" ?",this);
} else {
setState(() {
_currentIndex--;
_backStack.add(_currentIndex);
_setimages(context);
});
}
}
break;
}
}
void navigateBack(BuildContext context,int index) {
setState(() {
if (_currentIndex != 0) {
_currentIndex = index;
} else {
_utility.shoAlertDialog(
context,"Are you sure you want to Quit " + widget.entity.entityName + " ?",this);
}
});
}
Future<bool> customPop(BuildContext context) {
if (_backStack.length > 1) {
_backStack.removeAt(_backStack.length - 1);
navigateBack(context,_backStack[_backStack.length - 1]);
return Future.value(false);
} else {
return Future.value(true);
}
}
void callServiceConfirmation(BuildContext context,String title,String msg) {
showDialog(
context: context,builder: (mContext) {
return Dialog(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(20.0)),child: Wrap(
children: [
Column(
children: [
Container(
height: 20,Text(
title,textAlign: TextAlign.center,style: TextStyle(
fontFamily:
_utility.langID == 1 ? 'regularaR' : 'regular',color: Colors.black,fontWeight: FontWeight.bold,fontSize: 18.0),Container(
height: 20,Text(
msg,color: Colors.grey[600],fontSize: 16.0),Container(
height: 10,Divider(
color: Colors.grey,thickness: 1.0,Padding(
padding: const EdgeInsets.only(
top: 0,right: 16.0,bottom: 0,left: 16.0),child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,children: [
FlatButton(
onpressed: () {
Navigator.pop(context);
},child: Text(
S.of(context).cancel,color: Constant.companyColors[012],fontWeight: FontWeight.bold),color: Colors.transparent,Container(
width: 10,FlatButton(
onpressed: () {
Navigator.pop(context);
if (widget.entity.entityTitle == "OWNERS") {
BlocProvider.of<FormContainerPageBloc>(context)
..add(CallService(
entity: widget.entity,loaderCallBack: this,context: context,));
} else {
BlocProvider.of<FormContainerPageBloc>(context)
..add(CallService(
entity: widget.entity,context: context));
}
},child: Text(
S.of(context).ok,color: Constant.companyColors[013],)
],);
});
}
void _setimages(BuildContext context) {
Icon _backIcon = Icon(Icons.keyboard_arrow_left,size: 30,color: Constant.companyColors[02]);
Icon _nextIcon = Icon(Icons.keyboard_arrow_right,color: Constant.companyColors[02]);
Icon _closeIcon =
Icon(Icons.close,size: 25,color: Constant.companyColors[02]);
Icon _doneIcon =
Icon(Icons.check,color: Constant.companyColors[02]);
if (_currentIndex == 0) {
_backImage = FlatButton(
child: _closeIcon,onpressed: () {
navigateto(context,_currentIndex,"BACK");
},);
_nextimage = FlatButton(
child: _nextIcon,"NEXT");
},);
} else if (_currentIndex == _fragments.length - 1) {
_backImage = FlatButton(
child: _backIcon,);
_nextimage = FlatButton(
child: _doneIcon,);
} else {
_backImage = FlatButton(
child: _backIcon,);
}
}
@override
void onDialogCancel(BuildContext context) {
Navigator.pop(context);
}
@override
void onDialogConfirm(BuildContext context) {
Navigator.pop(context);
Navigator.pop(context);
FormContainerPage.listData.clear();
FormContainerPage.imageList.clear();
}
@override
void showSendingProgressBar() {
_sendingMsgProgressBar.show(context);
}
@override
void hideSendingProgressBar() {
_sendingMsgProgressBar.hide();
}
@override
void showMessage(String msg) {
_utility.showToast(context,msg);
}
@override
void registrationFailed(String responseMessage) {
showMessage(responseMessage);
}
@override
void registrationSuccess(String responseMessage) {
Navigator.pop(context,_fragments);
}
}
class AttachmentPage extends StatefulWidget {
final FormData formData;
_AttachmentPageState child;
@override
_AttachmentPageState createState() {
child = new _AttachmentPageState();
return child;
}
AttachmentPage({this.formData});
}
class _AttachmentPageState extends State<AttachmentPage> {
final _picker = ImagePicker();
AttachmentsAdapter _adapter;
List<Attachmentimage> _imageList = new List<Attachmentimage>();
void onItemClick(int index,Attachmentimage obj) {
_showAlertDialog(index);
}
@override
Widget build(BuildContext context) {
return FutureBuilder(
future: _getListings(),initialData: [],snapshot) {
return Scaffold(
body: Column(
children: [
Container(
alignment: Alignment.center,padding: EdgeInsets.all(20.0),child: TabTitle(
tabTitle: widget.formData.tabTitle,Expanded(
child: _adapter.getView(),));
});
}
_getListings() {
for (int i = 0; i < widget.formData.tabConfig.length; i++) {
TabConfig tabConfig = widget.formData.tabConfig[i];
Attachmentimage attachmentimage = Attachmentimage(
widget: Container(
width: double.infinity,decoration: Boxdecoration(
color: Constant.companyColors[50],borderRadius: BorderRadius.all(Radius.circular(20))),margin: EdgeInsets.all(8),child: Column(children: <Widget>[
FlatButton(
onpressed: () {
_showAlertDialog(i);
},child: Container(
child: Column(
children: <Widget>[
Image(image: Assetimage('assets/images/upload4.png')),Text(
"Upload your image here",style: TextStyle(
color: Constant.companyColors[60],fontFamily: 'regular',)),]),file: new File(""),config: tabConfig,type: tabConfig.type);
if (FormContainerPage.imageList.isNotEmpty) {
bool exist = false;
for (var item in FormContainerPage.imageList) {
if (item.config.type == tabConfig.type) {
exist = true;
}
}
if (!exist) {
FormContainerPage.imageList.add(attachmentimage);
}
} else {
FormContainerPage.imageList.add(attachmentimage);
}
if (_imageList!=null) {
if(_imageList.isNotEmpty) {
bool exist = false;
for (var item in _imageList) {
if (item.config.type == tabConfig.type) {
exist = true;
}
}
if (!exist) {
_imageList.add(attachmentimage);
}
}else{
_imageList.add(attachmentimage);
}
} else {
_imageList.add(attachmentimage);
}
}
_adapter = new AttachmentsAdapter(context,_imageList,onItemClick);
}
_showAlertDialog(int index) {
}
Future getimageCamera(int index) async {
}
Future getimagegallery(int index) async {
}
String checkData() {
String returnResult = "SUCCESS";
for (var item in _imageList) {
if (item.config.required) {
if (item.file.path.isEmpty) {
returnResult = "EMPTY";
} else {
returnResult = "SUCCESS";
}
} else {
returnResult = "EMPTY";
}
}
return returnResult;
}
}
当我从第一个附件页面转到下一个附件页面时，结果是包含四个图像的列表，知道每个图像仅包含两张图片
解决方法
暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！
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