sample on Flash package for Terada-san (G's Expansion 202309)

create_post_model.dart

// flutter
import 'package:flash/flash_helper.dart';
import 'package:flutter/material.dart';
// packages
import 'package:flash/flash.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
// constants
import 'package:udemy_flutter_sns/constants/strings.dart';
import 'package:udemy_flutter_sns/domain/post/post.dart';
import 'package:udemy_flutter_sns/models/main_model.dart';

final createPostProvider = ChangeNotifierProvider(((ref) => CreatePostModel()));

class CreatePostModel extends ChangeNotifier {
  final TextEditingController textEditingController = TextEditingController();
  String text = "";
  void showPostFlashBar({required BuildContext context, required MainModel mainModel}) {
    
    // NOTE：　最新版(バージョン3系)では恐らく下記のような感じだと思います
    context.showFlash(
      builder: (context, controller) {
        return FlashBar(
          controller: controller,
          content: Form(
            child: TextFormField(
              controller: textEditingController,
              style: const TextStyle(fontWeight: FontWeight.bold),
              onChanged: (value) => text = value,
              maxLength: 10,
            ),
          ),
          actions: [
            InkWell(
              onTap: () async {
                if (textEditingController.text.isNotEmpty) {
                  // メインの動作
                  await createPost(currentUserDoc: mainModel.currentUserDoc);
                  await controller.dismiss();
                  text = "";
                } else {
                  // 何もしない
                  await controller.dismiss();
                }
              },
              child: const Icon(Icons.send),
            ),
            InkWell(
              child: const Icon(Icons.close),
              onTap: () async => await controller.dismiss(),
            )
          ],
        );
      },
      persistent: true,
    );
    // context.showFlashBar(
    //   persistent: true,
    //   content: ,
    //   title: const Text(createPostTitle),
    //   primaryActionBuilder: (context, controller, _) {
    //     return InkWell(
    //       onTap: () async {
    //         if (textEditingController.text.isNotEmpty) {
    //           // メインの動作
    //           await createPost(currentUserDoc: mainModel.currentUserDoc);
    //           await controller.dismiss();
    //           text = "";
    //         } else {
    //           // 何もしない
    //           await controller.dismiss();
    //         }
    //       },
    //       child: const Icon(Icons.send),
    //     );
    //   },
    //   // 閉じる時の動作
    //   negativeActionBuilder: (context, controller, _) {
    //     return InkWell(
    //       child: const Icon(Icons.close),
    //       onTap: () async => await controller.dismiss(),
    //     );
    //   },
    // );
  }

  Future<void> createPost({required DocumentSnapshot<Map<String, dynamic>> currentUserDoc}) async {
    final Timestamp now = Timestamp.now();
    final String activeUid = currentUserDoc.id;
    final String postId = returnUuidV4();
    final Post post = Post(createdAt: now, hashTags: [], imageURL: "", likeCount: 0, text: text, postId: postId, uid: activeUid, updatedAt: now);
    await currentUserDoc.reference.collection("posts").doc(postId).set(post.toJson());
  }
}