Added missing cupertino search text field demo.

lib/data/demos.dart

@@ -1214,6 +1214,26 @@ List<GalleryDemo> cupertinoDemos(GalleryLocalizations localizations) {
       ],
       category: GalleryDemoCategory.cupertino,
     ),
+    GalleryDemo(
+      title: localizations.demoCupertinoSearchTextFieldTitle,
+      icon: GalleryIcons.search,
+      slug: 'cupertino-search-text-field',
+      subtitle: localizations.demoCupertinoSearchTextFieldSubtitle,
+      configurations: [
+        GalleryDemoConfiguration(
+          title: localizations.demoCupertinoSearchTextFieldTitle,
+          description: localizations.demoCupertinoSearchTextFieldDescription,
+          documentationUrl:
+          '$_docsBaseUrl/cupertino/CupertinoSearchTextField-class.html',
+          buildRoute: (_) => DeferredWidget(
+              cupertinoLoader,
+              // ignore: prefer_const_constructors
+                  () => cupertino_demos.CupertinoSearchTextFieldDemo()),
+          code: CodeSegments.cupertinoTextFieldDemo,
+        ),
+      ],
+      category: GalleryDemoCategory.cupertino,
+    ),
   ];
 }
 

lib/data/icons.dart

@@ -170,4 +170,5 @@ class GalleryIcons {
   static const IconData navigationRail = Icons.vertical_split;
   static const IconData appbar = Icons.web_asset;
   static const IconData divider = Icons.credit_card;
+  static const IconData search = Icons.search;
 }

lib/demos/cupertino/cupertino_demos.dart

@@ -4,6 +4,7 @@ export 'package:gallery/demos/cupertino/cupertino_button_demo.dart';
 export 'package:gallery/demos/cupertino/cupertino_context_menu_demo.dart';
 export 'package:gallery/demos/cupertino/cupertino_navigation_bar_demo.dart';
 export 'package:gallery/demos/cupertino/cupertino_picker_demo.dart';
+export 'package:gallery/demos/cupertino/cupertino_search_text_field_demo.dart';
 export 'package:gallery/demos/cupertino/cupertino_segmented_control_demo.dart';
 export 'package:gallery/demos/cupertino/cupertino_slider_demo.dart';
 export 'package:gallery/demos/cupertino/cupertino_switch_demo.dart';

lib/demos/cupertino/cupertino_search_text_field_demo.dart

@@ -0,0 +1,106 @@
+// Copyright 2019 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_gen/gen_l10n/gallery_localizations.dart';
+
+// BEGIN cupertinoTextFieldDemo
+
+class CupertinoSearchTextFieldDemo extends StatefulWidget {
+  const CupertinoSearchTextFieldDemo({super.key});
+
+  @override
+  State<CupertinoSearchTextFieldDemo> createState() =>
+      _CupertinoSearchTextFieldDemoState();
+}
+
+class _CupertinoSearchTextFieldDemoState
+    extends State<CupertinoSearchTextFieldDemo> {
+
+  final List<String> platforms = [
+    'Android',
+    'iOS',
+    'Windows',
+    'Linux',
+    'MacOS',
+    'Web'
+  ];
+
+  final TextEditingController _queryTextController = TextEditingController();
+  String _searchPlatform = '';
+  List<String> filteredPlatforms = [];
+
+  @override
+  void initState() {
+    super.initState();
+    filteredPlatforms = platforms;
+    _queryTextController.addListener(() {
+      if (_queryTextController.text.isEmpty) {
+        setState(() {
+          _searchPlatform = '';
+          filteredPlatforms = platforms;
+        });
+      } else {
+        setState(() {
+          _searchPlatform = _queryTextController.text;
+        });
+      }
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final localizations = GalleryLocalizations.of(context)!;
+    return CupertinoPageScaffold(
+      navigationBar: CupertinoNavigationBar(
+        automaticallyImplyLeading: false,
+        middle: Text(localizations.demoCupertinoSearchTextFieldTitle),
+      ),
+      child: SafeArea(
+        child: Column(
+          children: [
+            CupertinoSearchTextField(
+              controller: _queryTextController,
+              restorationId: 'search_text_field',
+              padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 12),
+              decoration: const BoxDecoration(
+                border: Border(
+                  bottom: BorderSide(
+                    width: 0,
+                    color: CupertinoColors.inactiveGray,
+                  ),
+                ),
+              ),
+              placeholder:
+                  localizations.demoCupertinoSearchTextFieldPlaceholder,
+            ),
+            _buildPlatformList(),
+          ],
+        ),
+      ),
+    );
+  }
+
+  Widget _buildPlatformList() {
+    if (_searchPlatform.isNotEmpty) {
+      List<String> tempList = [];
+      for (int i = 0; i < filteredPlatforms.length; i++) {
+        if (filteredPlatforms[i]
+            .toLowerCase()
+            .contains(_searchPlatform.toLowerCase())) {
+          tempList.add(filteredPlatforms[i]);
+        }
+      }
+      filteredPlatforms = tempList;
+    }
+    return ListView.builder(
+      itemCount: filteredPlatforms.length,
+      shrinkWrap: true,
+      itemBuilder: (context, index) {
+        return ListTile(title: Text(filteredPlatforms[index]));
+      },
+    );
+  }
+}

lib/l10n/intl_en.arb

@@ -1407,6 +1407,22 @@
   "@demoCupertinoTextFieldPIN": {
     "description": "The placeholder for a text field where a user would enter their PIN number."
   },
+  "demoCupertinoSearchTextFieldTitle": "Search text field",
+  "@demoCupertinoSearchTextFieldTitle": {
+    "description": "Title for the cupertino search text field demo."
+  },
+  "demoCupertinoSearchTextFieldSubtitle": "iOS-style search text field",
+  "@demoCupertinoSearchTextFieldSubtitle": {
+    "description": "Subtitle for the cupertino search text field demo."
+  },
+  "demoCupertinoSearchTextFieldDescription": "A search text field lets the user to searching by entered text, either with a hardware keyboard or with an onscreen keyboard.",
+  "@demoCupertinoSearchTextFieldDescription": {
+    "description": "Description for the cupertino search text field demo."
+  },
+  "demoCupertinoSearchTextFieldPlaceholder": "Start typing a text",
+  "@demoCupertinoSearchTextFieldPlaceholder": {
+    "description": "The placeholder for a search text field demo."
+  },
   "demoMotionTitle": "Motion",
   "@demoMotionTitle": {
     "description": "Title for the motion demo."