add task manager

lib/task_manager.dart

@@ -0,0 +1,129 @@
+import 'package:enum_flag/enum_flag.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_gen/gen_l10n/app_localizations.dart';
+import 'package:go_router/go_router.dart';
+import 'globals.dart';
+
+enum TaskStatusFilterFlag with EnumFlag {
+  wait,
+  running,
+  finished,
+  failed;
+
+  String localText(BuildContext context) {
+    final i18n = AppLocalizations.of(context)!;
+    switch (this) {
+      case TaskStatusFilterFlag.wait:
+        return i18n.waiting;
+      case TaskStatusFilterFlag.running:
+        return i18n.running;
+      case TaskStatusFilterFlag.finished:
+        return i18n.finished;
+      case TaskStatusFilterFlag.failed:
+        return i18n.failed;
+    }
+  }
+}
+
+const taskStatusFilterFlagAll = 15;
+
+class TaskStatusFilter {
+  TaskStatusFilter({this.code = taskStatusFilterFlagAll});
+  int code;
+  bool has(TaskStatusFilterFlag flag) => code.hasFlag(flag);
+  bool get isAll => code == taskStatusFilterFlagAll;
+  void add(TaskStatusFilterFlag flag) {
+    code |= flag.value;
+  }
+
+  void remove(TaskStatusFilterFlag flag) {
+    code &= ~flag.value;
+  }
+}
+
+class TaskManagerPage extends StatefulWidget {
+  const TaskManagerPage({super.key});
+
+  static const String routeName = '/task_manager';
+
+  @override
+  State<TaskManagerPage> createState() => _TaskManagerPage();
+}
+
+class _TaskManagerPage extends State<TaskManagerPage>
+    with ThemeModeWidget, IsTopWidget2 {
+  late TaskStatusFilter _filter;
+  @override
+  void initState() {
+    _filter = TaskStatusFilter();
+    super.initState();
+  }
+
+  Widget _buildChips() {
+    final i18n = AppLocalizations.of(context)!;
+    var list = <FilterChip>[
+      FilterChip(
+        label: Text(i18n.allTasks),
+        selected: _filter.isAll,
+        onSelected: (bool value) {
+          setState(() {
+            if (value) {
+              _filter.code = taskStatusFilterFlagAll;
+            } else {
+              _filter.code = 0;
+            }
+          });
+        },
+      )
+    ];
+    for (var flag in TaskStatusFilterFlag.values) {
+      list.add(FilterChip(
+        label: Text(flag.localText(context)),
+        selected: _filter.has(flag),
+        onSelected: (bool value) {
+          setState(() {
+            if (value) {
+              _filter.add(flag);
+            } else {
+              _filter.remove(flag);
+            }
+          });
+        },
+      ));
+    }
+    return SliverToBoxAdapter(
+        child: Wrap(
+      spacing: 5.0,
+      children: list,
+    ));
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final i18n = AppLocalizations.of(context)!;
+    if (isTop(context)) {
+      setCurrentTitle(i18n.taskManager, Theme.of(context).primaryColor.value);
+    }
+    return Scaffold(
+      body: CustomScrollView(
+        slivers: <Widget>[
+          SliverAppBar(
+            leading: IconButton(
+              icon: const Icon(Icons.arrow_back),
+              onPressed: () {
+                context.canPop() ? context.pop() : context.go("/");
+              },
+            ),
+            title: Text(i18n.taskManager),
+            actions: [
+              buildThemeModeIcon(context),
+              buildMoreVertSettingsButon(context),
+            ],
+            floating: true,
+          ),
+          _buildChips(),
+        ],
+      ),
+    );
+  }
+}