firestore_ui 1.8.0

A port of firebase_database's FirebaseAnimatedList

example/lib/main.dart

// Copyright 2017, the Chromium project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'dart:async';

import 'package:firebase_core/firebase_core.dart'
    show FirebaseApp, FirebaseOptions;
import 'package:firestore_ui/firestore_ui.dart';
import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';

final String title = 'firestore_ui example';

Future<void> main() async {
  final FirebaseApp app = await FirebaseApp.configure(
    name: 'test',
    options: const FirebaseOptions(
      googleAppID: '1:79601577497:ios:5f2bcc6ba8cecddd',
      gcmSenderID: '79601577497',
      apiKey: 'AIzaSyArgmRGfB5kiQT6CunAOmKRVKEsxKmy6YI-G72PVU',
      projectID: 'flutter-firestore',
    ),
  );
  final Firestore firestore = Firestore(app: app);

  runApp(MaterialApp(title: title, home: MyHomePage(firestore: firestore)));
}

class MessageListTile extends StatelessWidget {
  final int index;
  final DocumentSnapshot document;
  final Function(DocumentSnapshot) onTap;

  const MessageListTile({
    Key key,
    this.index,
    this.document,
    this.onTap,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return ListTile(
      title: Text(
          document != null ? "${document['message']}" : 'No message retrieved'),
      subtitle: Text('Message ${this.index + 1}'),
      onTap: () => onTap(this.document),
    );
  }
}

class MessageGridTile extends StatelessWidget {
  final int index;
  final DocumentSnapshot document;
  final Function(DocumentSnapshot) onTap;

  const MessageGridTile({
    Key key,
    this.index,
    this.document,
    this.onTap,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return InkWell(
      onTap: () => onTap?.call(document),
      child: Container(
        color: Colors.green,
        child: Center(
          child: CircleAvatar(
            backgroundColor: Colors.white,
            child: Text('${this.index + 1}'),
          ),
        ),
      ),
    );
  }
}

class MyHomePage extends StatefulWidget {
  final Firestore firestore;

  MyHomePage({Key key, this.firestore}) : super(key: key);

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _currentIndex = 1;

  CollectionReference get messages => widget.firestore.collection('messages');

  Future<void> _addMessage() async =>
      await messages.document().setData(<String, dynamic>{
        'message': 'Hello world!',
      });

  Future<void> _removeMessage(DocumentSnapshot snapshot) async =>
      await widget.firestore.runTransaction((transaction) async {
        await transaction.delete(snapshot.reference).catchError(
            (exception, stacktrace) =>
                print("Couldn't remove item: $exception"));
      });

  void _updateIndex(int value) {
    if (mounted) setState(() => _currentIndex = value);
  }

  Stream<QuerySnapshot> get query =>
      widget.firestore.collection('messages').snapshots();

  @override
  Widget build(BuildContext context) {
    Widget body;

    switch (_currentIndex) {
      case 0:
        body = FirestoreAnimatedList(
          key: ValueKey("list"),
          query: query,
          onLoaded: (snapshot) =>
              print("Received on list: ${snapshot.documents.length}"),
          itemBuilder: (
            BuildContext context,
            DocumentSnapshot snapshot,
            Animation<double> animation,
            int index,
          ) =>
              FadeTransition(
            opacity: animation,
            child: MessageListTile(
              index: index,
              document: snapshot,
              onTap: _removeMessage,
            ),
          ),
        );
        break;
      case 1:
        body = FirestoreAnimatedGrid(
          key: ValueKey("grid"),
          query: query,
          onLoaded: (snapshot) =>
              print("Received on grid: ${snapshot.documents.length}"),
          crossAxisCount: 2,
          itemBuilder: (
            BuildContext context,
            DocumentSnapshot snapshot,
            Animation<double> animation,
            int index,
          ) {
            return FadeTransition(
              opacity: animation,
              child: MessageGridTile(
                index: index,
                document: snapshot,
                onTap: _removeMessage,
              ),
            );
          },
        );
        break;
      case 2:
        body = FirestoreAnimatedStaggered(
          key: ValueKey("staggered"),
          onLoaded: (snapshot) =>
              print("Received on staggered: ${snapshot.documents.length}"),
          staggeredTileBuilder: (int index, DocumentSnapshot snapshot) =>
              StaggeredTile.count(2, index.isEven ? 2 : 1),
          crossAxisCount: 4,
          query: query,
          itemBuilder: (
            BuildContext context,
            DocumentSnapshot snapshot,
            Animation<double> animation,
            int index,
          ) {
            return FadeTransition(
              opacity: animation,
              child: MessageGridTile(
                index: index,
                document: snapshot,
                onTap: _removeMessage,
              ),
            );
          },
        );
        break;
    }

    return Scaffold(
      bottomNavigationBar: BottomNavigationBar(
        currentIndex: _currentIndex,
        onTap: _updateIndex,
        items: [
          BottomNavigationBarItem(
            icon: Icon(Icons.filter_1),
            title: Text("List"),
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.filter_2),
            title: Text("Grid"),
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.filter_3),
            title: Text("Staggered"),
          ),
        ],
      ),
      appBar: AppBar(
        title: Text(title),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _addMessage,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
      body: body,
    );
  }
}