104 lines
2.7 KiB
Dart
104 lines
2.7 KiB
Dart
import 'dart:async';
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import 'package:flutter/cupertino.dart';
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import 'package:flutter/widgets.dart';
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import 'package:mobile_nebula/components/SimplePage.dart';
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import 'package:mobile_nebula/services/utils.dart';
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/// SimplePage with a form and built in validation and confirmation to discard changes if any are made
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class FormPage extends StatefulWidget {
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const FormPage(
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{Key key,
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this.title,
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@required this.child,
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@required this.onSave,
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@required this.changed,
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this.hideSave = false,
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this.scrollController})
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: super(key: key);
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final String title;
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final Function onSave;
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final Widget child;
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final ScrollController scrollController;
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/// If you need the page to progress to a certain point before saving, control it here
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final bool hideSave;
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/// Useful if you have a non form field that can change, overrides the internal changed state if true
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final bool changed;
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@override
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_FormPageState createState() => _FormPageState();
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}
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class _FormPageState extends State<FormPage> {
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var changed = false;
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final _formKey = GlobalKey<FormState>();
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@override
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Widget build(BuildContext context) {
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changed = widget.changed || changed;
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return WillPopScope(
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onWillPop: () {
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if (!changed) {
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return Future.value(true);
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}
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var completer = Completer<bool>();
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Utils.confirmDelete(context, 'Discard changes?', () {
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completer.complete(true);
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}, deleteLabel: 'Yes', cancelLabel: 'No');
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return completer.future;
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},
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child: SimplePage(
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leadingAction: _buildLeader(context),
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trailingActions: _buildTrailer(context),
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scrollController: widget.scrollController,
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title: widget.title,
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child: Form(
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key: _formKey,
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onChanged: () => setState(() {
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changed = true;
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}),
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child: widget.child),
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));
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}
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Widget _buildLeader(BuildContext context) {
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return Utils.leadingBackWidget(context, label: changed ? 'Cancel' : 'Back', onPressed: () {
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if (changed) {
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Utils.confirmDelete(context, 'Discard changes?', () {
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changed = false;
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Navigator.pop(context);
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}, deleteLabel: 'Yes', cancelLabel: 'No');
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} else {
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Navigator.pop(context);
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}
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});
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}
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List<Widget> _buildTrailer(BuildContext context) {
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if (!changed || widget.hideSave) {
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return [];
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}
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return [
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Utils.trailingSaveWidget(
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context,
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() {
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if (!_formKey.currentState.validate()) {
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return;
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}
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_formKey.currentState.save();
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widget.onSave();
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},
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)
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];
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}
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}
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