質問編集履歴
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ソースコードを追記しました。
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@@ -19,6 +19,29 @@
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[https://qiita.com/mamoru_takami/items/f53aebd97fb1140d122a]
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```Dart
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import 'package:flutter/material.dart';
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void main() => runApp(MyApp());
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class Todo {
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final String title;
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final String description;
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Todo({@required this.title, @required this.description})
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: assert(title != null),
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assert(description != null);
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}
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class MyApp extends StatelessWidget {
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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debugShowCheckedModeBanner: false, // Debug文言の削除
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title: 'Navigation',
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home: ListScreen2(title: 'List'),
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);
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}
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}
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class Model {
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String title;
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String subTitle;
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@@ -29,75 +52,245 @@
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@required this.subTitle,
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@required this.key,
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});
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}
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class ListScreen2 extends StatefulWidget {
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ListScreen2({Key key, this.title}) : super(key: key);
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final String title;
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@override
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_ListScreenState2 createState() => _ListScreenState2();
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}
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// TopScreen一部
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onTap: () async {
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var result = await Navigator.push(
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context,
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MaterialPageRoute(
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-
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class _ListScreenState2 extends State<ListScreen2> {
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//print(result);
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setState(() {
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model = result;
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-
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List<Model> modelList;
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});
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},
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@override
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//
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// 起動時に初期化
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void initState() {
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super.initState();
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// 起動時に初期化
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modelList = [];
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-
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List<String> titleList = ["Title A", "Title B", "Title C"];
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List<String> subTitleList = ["SubTitle A", "SubTitle B", "SubTitle C"];
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-
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for (int i = 0; i < 3; i++) {
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// これだと同じものを参照している？っぽい挙動
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Model model = Model(
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-
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title: titleList[i],
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subTitle: subTitleList[i],
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key: i.toString(),
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);
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modelList.add(model);
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}
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}
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// リスト項目となる削除可能なウィジェットを作成
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Widget buildItem(Model model, int index) {
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return Dismissible(
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key: Key('${model.key}'), // 項目が特定できるよう固有の文字列をキーとする
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background: Container(
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padding: EdgeInsets.only(
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right: 48,
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),
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alignment: AlignmentDirectional.centerEnd,
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color: Colors.red,
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child: Icon(
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Icons.delete,
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color: Colors.white,
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),
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), // スワイプしているアイテムの背景色
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direction: DismissDirection.endToStart,
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confirmDismiss: (direction) async {
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// 削除するか確認する
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return await showDialog(
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context: context,
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builder: (BuildContext context) {
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return AlertDialog(
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title: Text('確認ダイアログ'),
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content: Text('本当に削除しますか？'),
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actions: <Widget>[
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TextButton(
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onPressed: () => Navigator.of(context).pop(false),
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child: Text('CANCEL'),
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),
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TextButton(
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onPressed: () => Navigator.of(context).pop(true),
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child:
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Text('DELETE', style: TextStyle(color: Colors.red))),
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],
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);
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},
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);
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},
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onDismissed: (direction) {
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// 削除時の処理
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setState(() {
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modelList.remove(model);
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});
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},
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// 各項目のレイアウト
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child: Card(
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child: ListTile(
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tileColor: Theme.of(context).cardColor,
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title: Text('${model.title}',
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style: TextStyle(
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fontWeight: FontWeight.bold, fontSize: 20, height: 1.2)),
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subtitle: Text('${model.key} ${model.subTitle}'),
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onTap: () async {
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var result = await Navigator.push(
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context,
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MaterialPageRoute(
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builder: (context) => NextScreen2(model: model)));
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//print(result);
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setState(() {
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if (result != null) {
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model = result;
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print('set state ' + model.title);
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}
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});
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},
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)));
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}
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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appBar: AppBar(
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title: Text(widget.title),
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),
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body: Container(
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child: ReorderableListView(
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onReorder: (int oldIndex, int newIndex) {
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if (newIndex > oldIndex) {
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// 元々下にあった要素が上にずれるため一つ分後退させる
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newIndex -= 1;
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}
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// 並び替え処理
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Model model = modelList[oldIndex];
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setState(() {
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modelList.removeAt(oldIndex);
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modelList.insert(newIndex, model);
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});
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},
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padding: EdgeInsets.only(top: 4),
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children: modelList
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.asMap()
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.map((i, item) => MapEntry(i, buildItem(item, i)))
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.values
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.toList())
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//],
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));
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}
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}
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return WillPopScope(
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onWillPop: () {
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print('onWillPop');
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Navigator.of(context).pop(_initModel);
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return Future.value(false);
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},
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child: Column(
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children: [
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///////////
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class NextScreen2 extends StatefulWidget {
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Model _model;
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NextScreen2({Key key, @required Model model})
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: assert(model != null),
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this._model = model,
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super(key: key);
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@override
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_NextScreenState2 createState() => _NextScreenState2();
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}
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class _NextScreenState2 extends State<NextScreen2> {
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// 起動時に初期化
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Model _initModel;
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void initState() {
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super.initState();
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_initModel = Model(
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title: widget._model.title,
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subTitle: widget._model.subTitle,
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key: widget._model.key,
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);
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}
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@override
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Widget build(BuildContext context) {
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return WillPopScope(
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onWillPop: () {
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print('onWillPop');
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Navigator.of(context).pop(_initModel);
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return Future.value(false);
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},
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child: Scaffold(
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appBar: AppBar(
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title: Text('Edit'),
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),
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body: Container(
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padding: EdgeInsets.all(20),
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child: Column(
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mainAxisAlignment: MainAxisAlignment.start,
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children: <Widget>[
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// タイトル
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TextField(
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controller: TextEditingController()
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..text = widget._model.title,
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decoration: InputDecoration(
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hintText: 'タイトル',
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hintStyle: TextStyle(
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color: Colors.black26,
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),
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),
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onChanged: (text) {
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widget._model.title = text;
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},
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),
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// 登録ボタン
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Container(
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//padding: EdgeInsets.all(_PADDING_SIZE),
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padding: EdgeInsets.fromLTRB(0, 10, 0, 10),
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width: double.infinity, // 横幅いっぱいに広げる
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height: 60,
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child: ElevatedButton(
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child: Text('確定'),
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onPressed: () {
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// TODO: 新規登録
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// 前の画面に戻る
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print('確定');
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if (Navigator.of(context).canPop()) {
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Navigator.of(context).pop(widget._model);
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}
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},
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),
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),
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// キャンセルボタン
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Container(
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//padding: EdgeInsets.all(_PADDING_SIZE),
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padding: EdgeInsets.fromLTRB(0, 10, 0, 10),
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width: double.infinity, // 横幅いっぱいに広げる
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height: 60,
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child: ElevatedButton(
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child: Text('キャンセル'),
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onPressed: () {
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print('キャンセル');
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// 前の画面に戻る
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widget._model = _initModel;
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if (Navigator.of(context).canPop()) {
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Navigator.of(context).pop(null);
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}
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},
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style: ElevatedButton.styleFrom(
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primary: Colors.grey[200],
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onPrimary: Colors.black45,
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286
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),
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287
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),
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288
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),
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289
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],
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290
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),
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291
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),
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));
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}
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}
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103
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```
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