#282 Add Search Bar in Example Gallery App

examples/mirai_gallery/assets/json/home_screen.json

@@ -1,26 +1,4 @@
-{
-  "type": "scaffold",
-  "appBar": {
-    "type": "appBar",
-    "title": {
-      "type": "text",
-      "data": "Mirai Gallery"
-    },
-    "elevation": 0
-  },
-  "body": {
-    "type": "padding",
-    "padding": {
-      "bottom": 24
-    },
-    "child": {
-      "type": "listView",
-      "shrinkWrap": true,
-      "separator": {
-        "type": "container",
-        "height": 10
-      },
-      "children": [
+ [
         {
           "type": "listTile",
           "leading": {
@@ -1215,6 +1193,4 @@
           }
         }
       ]
-    }
-  }
-}
+

examples/mirai_gallery/lib/app/home/bloc/home_bloc.dart

@@ -0,0 +1,75 @@
+import 'dart:convert';
+
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+
+part 'home_event.dart';
+part 'home_state.dart';
+
+class HomeBloc extends Bloc<HomeEvent, HomeState> {
+  HomeBloc() : super(const HomeLoading()) {
+    on<_Initialize>(_onInitializeEvent);
+    on<UserInputEvent>(_onUserInputEvent);
+    controller = TextEditingController()
+      ..addListener(_textEditingControllerListener);
+    add(const _Initialize());
+  }
+
+  late final TextEditingController controller;
+
+  final List<Map<String, dynamic>> _allItems = [];
+
+  void _onInitializeEvent(_Initialize event, Emitter<HomeState> emit) async {
+    final items = await _loadAndParseJsonFromAsset();
+    if (items.isNotEmpty) {
+      _allItems.addAll(items);
+    }
+    emit(HomeLoaded(items: items));
+  }
+
+  void _onUserInputEvent(UserInputEvent event, Emitter<HomeState> emit) {
+    if (event.keyword.isNotEmpty) {
+      List<Map<String, dynamic>> matchedItems = [];
+
+      final String keyword = event.keyword.toLowerCase();
+      for (final Map<String, dynamic> item in _allItems) {
+        var text = item["title"]?["data"];
+        if (text != null && text is String) {
+          if (text.toLowerCase().contains(keyword)) {
+            matchedItems.add(item);
+          }
+        }
+      }
+      emit(HomeLoaded(items: matchedItems));
+    } else {
+      emit(HomeLoaded(items: _allItems));
+    }
+  }
+
+  Future<List<Map<String, dynamic>>> _loadAndParseJsonFromAsset() async {
+    try {
+      final String json =
+          await rootBundle.loadString("assets/json/home_screen.json");
+      final List<dynamic> decodedJson = jsonDecode(json);
+      final List<Map<String, dynamic>> castedJson =
+          decodedJson.cast<Map<String, dynamic>>();
+      return castedJson;
+    } catch (_) {
+      return const [];
+    }
+  }
+
+  // Add `UserInputEvent` with the latest keyword
+  void _textEditingControllerListener() {
+    add(UserInputEvent(keyword: controller.text));
+  }
+
+  @override
+  Future<void> close() {
+    controller
+      ..removeListener(_textEditingControllerListener)
+      ..dispose();
+    return super.close();
+  }
+}

examples/mirai_gallery/lib/app/home/bloc/home_event.dart

@@ -0,0 +1,17 @@
+part of 'home_bloc.dart';
+
+@immutable
+sealed class HomeEvent {
+  const HomeEvent();
+}
+
+// Event used to perform the initializations of the HomeBloc
+class _Initialize extends HomeEvent {
+  const _Initialize();
+}
+
+class UserInputEvent extends HomeEvent {
+  final String keyword;
+
+  const UserInputEvent({required this.keyword});
+}

examples/mirai_gallery/lib/app/home/bloc/home_state.dart

@@ -0,0 +1,16 @@
+part of 'home_bloc.dart';
+
+@immutable
+sealed class HomeState {
+  final List<Map<String, dynamic>> items;
+
+  const HomeState({required this.items});
+}
+
+class HomeLoading extends HomeState {
+  const HomeLoading({super.items = const []});
+}
+
+class HomeLoaded extends HomeState {
+  const HomeLoaded({required super.items});
+}

examples/mirai_gallery/lib/app/home/home_screen.dart

@@ -1,11 +1,68 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:mirai/mirai.dart';
 
+import 'bloc/home_bloc.dart';
+
 class HomeScreen extends StatelessWidget {
   const HomeScreen({super.key});
 
   @override
   Widget build(BuildContext context) {
-    return Mirai.fromAssets('assets/json/home_screen.json') ?? const SizedBox();
+    return BlocProvider<HomeBloc>(
+      create: (context) => HomeBloc(),
+      child: Builder(
+        builder: (context) {
+          return Scaffold(
+            appBar: AppBar(
+              title: const Text("Mirai Gallery"),
+            ),
+            body: Column(
+              children: [
+                TextField(
+                  controller: BlocProvider.of<HomeBloc>(context).controller,
+                  decoration: InputDecoration(
+                    hintText: "Search",
+                    prefixIcon: const Icon(Icons.search),
+                    suffixIcon: IconButton(
+                      onPressed:
+                          BlocProvider.of<HomeBloc>(context).controller.clear,
+                      icon: const Icon(Icons.clear),
+                    ),
+                  ),
+                ),
+                const SizedBox(height: 10.0),
+                Expanded(
+                  child: BlocBuilder<HomeBloc, HomeState>(
+                    builder: (context, state) {
+                      if (state is HomeLoaded) {
+                        return Mirai.fromJson(
+                              {
+                                "type": "listView",
+                                "shrinkWrap": false,
+                                "separator": {
+                                  "type": "container",
+                                  "height": 10
+                                },
+                                "children": state.items,
+                              },
+                              context,
+                            ) ??
+                            const SizedBox();
+                      }
+                      if (state is HomeLoading) {
+                        return const CircularProgressIndicator();
+                      }
+                      return const SizedBox();
+                    },
+                  ),
+                ),
+                SizedBox(height: 24.0 + MediaQuery.of(context).padding.bottom)
+              ],
+            ),
+          );
+        },
+      ),
+    );
   }
 }