分割为多个tab

lib/main.dart

@@ -57,4 +57,3 @@ Future<void> main() async {
     );
   });
 }
-

lib/page/convert.dart

@@ -0,0 +1,154 @@
+import 'dart:convert';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_staggered_animations/flutter_staggered_animations.dart';
+
+class EncodePage extends StatefulWidget {
+  const EncodePage({Key? key}) : super(key: key);
+
+  @override
+  _EncodePageState createState() => _EncodePageState();
+}
+
+class _EncodePageState extends State<EncodePage>
+    with AutomaticKeepAliveClientMixin {
+  late TextEditingController _textEditingController;
+  late TextEditingController _textEditingControllerResult;
+  late MediaQueryData _media;
+  late ThemeData _theme;
+
+  static const List<String> _typeOption = [
+    'base64 decode',
+    'base64 encode',
+    'URL encode',
+    'URL decode'
+  ];
+  int _typeOptionIndex = 0;
+
+  @override
+  void initState() {
+    super.initState();
+    _textEditingController = TextEditingController();
+    _textEditingControllerResult = TextEditingController();
+  }
+
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+    _media = MediaQuery.of(context);
+    _theme = Theme.of(context);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    super.build(context);
+    return Scaffold(
+      body: SingleChildScrollView(
+          padding: const EdgeInsets.symmetric(horizontal: 7),
+          child: AnimationLimiter(
+              child: Column(
+                  children: AnimationConfiguration.toStaggeredList(
+            duration: const Duration(milliseconds: 377),
+            childAnimationBuilder: (widget) => SlideAnimation(
+              verticalOffset: 50.0,
+              child: FadeInAnimation(
+                child: widget,
+              ),
+            ),
+            children: [
+              const SizedBox(height: 13),
+              _buildInputTop(),
+              _buildTypeOption(),
+              _buildResult(),
+            ],
+          )))),
+      floatingActionButton: FloatingActionButton(
+        onPressed: () {
+          _textEditingControllerResult.text = doConvert();
+        },
+        tooltip: 'convert',
+        child: const Icon(Icons.send),
+      ),
+    );
+  }
+
+  String doConvert() {
+    final text = _textEditingController.text;
+    switch (_typeOptionIndex) {
+      case 0:
+        return utf8.decode(base64.decode(text));
+      case 1:
+        return base64.encode(utf8.encode(text));
+      case 2:
+        return Uri.encodeFull(text);
+      case 3:
+        return Uri.decodeFull(text);
+      default:
+        return '未知编码';
+    }
+  }
+
+  Widget _buildInputTop() {
+    return SizedBox(
+      height: _media.size.height * 0.33,
+      child: _buildInput(_textEditingController),
+    );
+  }
+
+  Widget _buildTypeOption() {
+    return Card(
+      child: ExpansionTile(
+        title: Text(
+          _typeOption[_typeOptionIndex],
+          style: const TextStyle(fontSize: 16.0, fontWeight: FontWeight.w500),
+        ),
+        children: _typeOption
+            .map((e) => ListTile(
+                  title: Text(
+                    e,
+                    style: TextStyle(
+                        color:
+                            _theme.textTheme.bodyText2!.color!.withAlpha(177)),
+                  ),
+                  trailing: _buildRadio(_typeOption.indexOf(e)),
+                ))
+            .toList(),
+      ),
+    );
+  }
+
+  Widget _buildResult() {
+    return SizedBox(
+      height: _media.size.height * 0.33,
+      child: _buildInput(_textEditingControllerResult),
+    );
+  }
+
+  Widget _buildInput(TextEditingController controller) {
+    return Card(
+      child: TextField(
+        maxLines: 20,
+        decoration: InputDecoration(
+            fillColor: Theme.of(context).cardColor,
+            filled: true,
+            border: InputBorder.none),
+        controller: controller,
+      ),
+    );
+  }
+
+  Radio _buildRadio(int index) {
+    return Radio<int>(
+      value: index,
+      groupValue: _typeOptionIndex,
+      onChanged: (int? value) {
+        setState(() {
+          _typeOptionIndex = value!;
+        });
+      },
+    );
+  }
+
+  @override
+  bool get wantKeepAlive => true;
+}

lib/page/home.dart

@@ -1,7 +1,6 @@
-import 'dart:convert';
-
 import 'package:flutter/material.dart';
 import 'package:toolbox/core/route.dart';
+import 'package:toolbox/page/convert.dart';
 import 'package:toolbox/page/debug.dart';
 
 class MyHomePage extends StatefulWidget {
@@ -12,137 +11,42 @@ class MyHomePage extends StatefulWidget {
   State<MyHomePage> createState() => _MyHomePageState();
 }
 
-class _MyHomePageState extends State<MyHomePage> {
+class _MyHomePageState extends State<MyHomePage>
-  late TextEditingController _textEditingController;
+    with AutomaticKeepAliveClientMixin, SingleTickerProviderStateMixin {
-  late TextEditingController _textEditingControllerResult;
+  final List<String> _tabs = ['编码', 'Ping', '1', '2', '3'];
-  late MediaQueryData _media;
+  late final TabController _tabController;
-  late ThemeData _theme;
-
-  static const List<String> _typeOption = [
-    'base64 decode',
-    'base64 encode',
-    'URL encode',
-    'URL decode'
-  ];
-  int _typeOptionIndex = 0;
 
   @override
   void initState() {
     super.initState();
-    _textEditingController = TextEditingController();
+    _tabController = TabController(length: _tabs.length, vsync: this);
-    _textEditingControllerResult = TextEditingController();
-  }
-
-  @override
-  void didChangeDependencies() {
-    super.didChangeDependencies();
-    _media = MediaQuery.of(context);
-    _theme = Theme.of(context);
   }
 
   @override
   Widget build(BuildContext context) {
+    super.build(context);
     return Scaffold(
       appBar: AppBar(
         title: GestureDetector(
-          onLongPress: () => AppRoute(const DebugPage(), 'Debug Page').go(context),
+          onLongPress: () =>
+              AppRoute(const DebugPage(), 'Debug Page').go(context),
           child: Text(widget.title),
         ),
+        bottom: TabBar(
+          tabs: _tabs.map((e) => Tab(text: e)).toList(),
+          controller: _tabController,
         ),
-      body: SingleChildScrollView(
-          padding: const EdgeInsets.symmetric(horizontal: 7),
-          child: Column(
-            children: [
-              const SizedBox(height: 13),
-              _buildInputTop(),
-              _buildTypeOption(),
-              _buildResult(),
-            ],
-          )),
-      floatingActionButton: FloatingActionButton(
-        onPressed: () {
-          _textEditingControllerResult.text = doConvert();
-        },
-        tooltip: 'convert',
-        child: const Icon(Icons.send),
       ),
+      body: TabBarView(controller: _tabController, children: const [
+        EncodePage(),
+        EncodePage(),
+        EncodePage(),
+        EncodePage(),
+        EncodePage()
+      ]),
     );
   }
 
-  String doConvert() {
+  @override
-    final text = _textEditingController.text;
+  bool get wantKeepAlive => true;
-    switch (_typeOptionIndex) {
-      case 0:
-        return utf8.decode(base64.decode(text));
-      case 1:
-        return base64.encode(utf8.encode(text));
-      case 2:
-        return Uri.encodeFull(text);
-      case 3:
-        return Uri.decodeFull(text);
-      default:
-        return '未知编码';
-    }
-  }
-
-  Widget _buildInputTop() {
-    return SizedBox(
-      height: _media.size.height * 0.33,
-      child: _buildInput(_textEditingController),
-    );
-  }
-
-  Widget _buildTypeOption() {
-    return Card(
-      child: ExpansionTile(
-        title: Text(
-          _typeOption[_typeOptionIndex],
-          style: const TextStyle(fontSize: 16.0, fontWeight: FontWeight.w500),
-        ),
-        children: _typeOption
-            .map((e) => ListTile(
-                  title: Text(
-                    e,
-                    style: TextStyle(
-                        color:
-                            _theme.textTheme.bodyText2!.color!.withAlpha(177)),
-                  ),
-                  trailing: _buildRadio(_typeOption.indexOf(e)),
-                ))
-            .toList(),
-      ),
-    );
-  }
-
-  Widget _buildResult() {
-    return SizedBox(
-      height: _media.size.height * 0.33,
-      child: _buildInput(_textEditingControllerResult),
-    );
-  }
-
-  Widget _buildInput(TextEditingController controller) {
-    return Card(
-      child: TextField(
-        maxLines: 20,
-        decoration: InputDecoration(
-            fillColor: Theme.of(context).cardColor,
-            filled: true,
-            border: InputBorder.none),
-        controller: controller,
-      ),
-    );
-  }
-
-  Radio _buildRadio(int index) {
-    return Radio<int>(
-      value: index,
-      groupValue: _typeOptionIndex,
-      onChanged: (int? value) {
-        setState(() {
-          _typeOptionIndex = value!;
-        });
-      },
-    );
-  }
 }