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：
t2附件页面代码：
import '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,
"Quit theForm",
"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,
style: TextStyle(
fontFamily:
_utility.langID == 1 ? 'regularAR' : 'regular',
color: Colors.grey[600],
fontWeight: FontWeight.bold,
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,
style: TextStyle(
fontFamily: _utility.langID == 1
? 'regularAR'
: 'regular',
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,
loaderCallBack: this,
context: context));
}
},
child: Text(
S.of(context).ok,
style: TextStyle(
fontFamily: _utility.langID == 1
? 'regularAR'
: 'regular',
color: Constant.companyColors[013],
fontWeight: FontWeight.bold),
),
color: Colors.transparent,
),
],
),
)
],
),
],
),
);
});
}
void _setImages(BuildContext context) {
Icon _backIcon = Icon(Icons.keyboard_arrow_left,
size: 30, color: Constant.companyColors[02]);
Icon _nextIcon = Icon(Icons.keyboard_arrow_right,
size: 30, color: Constant.companyColors[02]);
Icon _closeIcon =
Icon(Icons.close, size: 25, color: Constant.companyColors[02]);
Icon _doneIcon =
Icon(Icons.check, size: 30, color: Constant.companyColors[02]);
if (_currentIndex == 0) {
_backImage = FlatButton(
child: _closeIcon,
onPressed: () {
navigateTo(context, _currentIndex, "BACK");
},
);
_nextImage = FlatButton(
child: _nextIcon,
onPressed: () {
navigateTo(context, _currentIndex, "NEXT");
},
);
} else if (_currentIndex == _fragments.length - 1) {
_backImage = FlatButton(
child: _backIcon,
onPressed: () {
navigateTo(context, _currentIndex, "BACK");
},
);
_nextImage = FlatButton(
child: _doneIcon,
onPressed: () {
navigateTo(context, _currentIndex, "NEXT");
},
);
} else {
_backImage = FlatButton(
child: _backIcon,
onPressed: () {
navigateTo(context, _currentIndex, "BACK");
},
);
_nextImage = FlatButton(
child: _nextIcon,
onPressed: () {
navigateTo(context, _currentIndex, "NEXT");
},
);
}
}
@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);
}
}
和最后一个DynamicPage代码：
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: [],
builder: (context, 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);
},
color: Colors.transparent,
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',
fontSize: 16.0),
),
],
)),
),
]),
),
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