awesome-uiwidgets/AwesomeUIWidgets/Assets/Scripts/ChatPage.cs

using System;
using System.Collections.Generic;
using System.Linq;
using ChatComponents;
using uiwidgets;
using Unity.UIWidgets.async;
using Unity.UIWidgets.cupertino;
using Unity.UIWidgets.engine;
using Unity.UIWidgets.foundation;
using Unity.UIWidgets.material;
using Unity.UIWidgets.painting;
using Unity.UIWidgets.rendering;
using Unity.UIWidgets.widgets;
using UnityEditor.Build.Content;
using UnityEngine;
using Random = System.Random;
using TextStyle = Unity.UIWidgets.ui.TextStyle;

namespace UIWidgetsSample

{
    public class ChatRoomDemo : UIWidgetsPanel
    {
        protected void OnEnable()
        {
            base.OnEnable();
        }

        protected override void main()
        {
            ui_.runApp(new MyApp());
        }

        class MyApp : StatelessWidget
        {
            public override Widget build(BuildContext context)
            {
                return new CupertinoApp(
                    
                    home: new DateAndTimePickerWidget()
                );
            }
        }
    }
    [System.Serializable]
    public class ChatMessages
    {
        public List<ChatMessage> chatMessages;
    }

    [System.Serializable]
    public class ChatMessage
    {
        public ChatUser author;
        public int createdAt;
        public string id;
        public string status;
        public string text;
        public string type;

    }
    
    [System.Serializable]
    public class ChatUser
    {
      
        public string firstName;
        public string id;
        public string imageUrl;

    }
    
    

    public class ChatPage : StatefulWidget
    {
        public ChatPage(Key key = null) : base(key)
        {
        }

        public override State createState()
        {
            return new _ChatPageState();
        }
    }

    public class _ChatPageState : State<ChatPage>
    {
        public readonly ChatComponents.User _user = new ChatComponents.User("06c33e8b-e835-4736-80f4-63f44b66666c");
        private List<ChatComponents.Message> _messages = new List<ChatComponents.Message>();
        public int _page = 0;

        public override void initState()
        {
            base.initState();
            _loadMessages();
        }

        private void _addMessage(ChatComponents.Message message)
        {
            setState(() =>
            {
                _messages.Insert(0, message);
            });
        }

        private void _handleAtachmentPressed()
        {
            material_.showModalBottomSheet<object>(
                context,
                context =>
                {
                    return new SizedBox(
                        height: 144,
                        child: new Column(
                            crossAxisAlignment: CrossAxisAlignment.stretch,
                            children: new List<Widget>
                            {
                                new CupertinoButton(
                                    onPressed: () =>
                                    {
                                        Navigator.pop(context);
                                        //_handleImageSelection();
                                    },
                                    child: new Align(
                                        alignment: Alignment.centerLeft,
                                        child: new Text("Photo")
                                    )
                                ),
                                new CupertinoButton(
                                    onPressed: () =>
                                    {
                                        Navigator.pop(context);
                                        //_handleFileSelection();
                                    },
                                    child:
                                    new Align(
                                        alignment: Alignment.centerLeft,
                                        child: new Text("File")
                                    )
                                ),
                                new CupertinoButton(
                                    onPressed: () => Navigator.pop(context),
                                    child: new Align(
                                        alignment: Alignment.centerLeft,
                                        child: new Text("Cancel")
                                    )
                                )
                            }
                        )
                    );
                }
            );
        }

        /* private void _handleFileSelection()
         {
             var result = FilePicker.platform.pickFiles(
                 type: FileType.any
             );
 
             if (result != null)
             {
                 var message = new ChatComponents.FileMessage(
                     _user,
                     createdAt: DateTime.Now.Millisecond,
                     name: result.files.single.name,
                     id: Uuid().v4(),
                     mimeType:
                     lookupMimeType(result.files.single.path ?? ""),
                     size:
                     result.files.single.size,
                     uri:
                     result.files.single.path ?? ""
                 );
 
                 _addMessage(message);
             }
         }*/

        /* private void _handleImageSelection()
         {
             var result = new ImagePicker().getImage(
                 imageQuality: 70,
                 maxWidth: 1440,
                 source: ImageSource.gallery
             );
 
             if (result != null)
             {
                 var bytes = result.readAsBytes();
                 var image = decodeImageFromList(bytes);
                 var name = result.path.split("/").last;
 
                 var message = new ChatComponents.ImageMessage(
                     _user,
                     createdAt: DateTime.Now.Millisecond,
                     height: image.height.toDouble(),
                     id: Uuid().v4(),
                     name:
                     name,
                     size:
                     bytes.length,
                     uri:
                     result.path,
                     width:
                     image.width.toDouble()
                 );
 
                 _addMessage(message);
             }
         }*/

        private void _handleMessageTap(ChatComponents.Message message)
        {
            if (message is ChatComponents.FileMessage)
                //OpenFile.open(message.uri);
                Debug.Log("OPEN FILE");
        }

        private void _handlePreviewDataFetched(
            ChatComponents.TextMessage message,
            ChatComponents.PreviewData previewData
        )
        {
            var index = 0;
            foreach (var element in _messages)
            {
                if (element.id == message.id)
                {
                    index = _messages.IndexOf(element);
                }
            }


            var updatedMessage = _messages[index].copyWith(previewData: previewData);

            WidgetsBinding.instance?.addPostFrameCallback(_ =>
            {
                setState(() => { _messages[index] = updatedMessage; });
            });
        }

        private void _handleSendPressed(ChatComponents.PartialText message)
        {
            var textMessage = new ChatComponents.TextMessage(
                _user,
                createdAt: DateTime.Now.Millisecond,
                id: "b4878b96-efbc-479a-8291-474ef323aa" + _messages.Count.ToString(),
                text: message.text
            );

            _addMessage(textMessage);
        }
        private Future _handleEndReached()
        {
            List<ChatComponents.TextMessage> messages = new List<ChatComponents.TextMessage>();
            List<string> ids = new List<string>() { };
            for (int i = 1; i < 10; i++)
            {
                ids.Add(i.ToString());
            }
            foreach (var id in ids)
            {
                messages.Add(new ChatComponents.TextMessage(
                    _user,
                    id: "b4878b96-efbc-479a-8291-474ef323aa" + id,
                    text: id + "......"
                ) );
            }
            setState(()=> {
                {
                    _messages.AddRange(messages);
                    _page = _page + 1;
                }
            });
            return Future.value();
        }
        private void _loadMessages()
        {
            List<ChatComponents.Message> results = new List<ChatComponents.Message>();
            TextAsset info = Resources.Load<TextAsset>("assets/messages");
            
            List<ChatMessage> chatMessages = new List<ChatMessage>();
            List<string> jsoninfo = info.text.Split('&').ToList();
            foreach (var _info in jsoninfo)
            {
                var _message = JsonUtility.FromJson<ChatMessage>(_info);
                chatMessages.Add(_message);
            }
            foreach (var _message in chatMessages)
            {
                
                results.Add( new ChatComponents.TextMessage(
                        author: new User(
                            id: _message.author.id,
                            firstName: _message.author.firstName,
                            imageUrl: _message.author.imageUrl
                        ),
                        createdAt: _message.createdAt,
                        id: _message.id,
                        status: ChatRoomUtils.getStatusFromString(_message.status),
                        text: _message.text
                    )
                    );
            }
         
            setState(() => { _messages = results; });
        }

        public override Widget build(BuildContext context)
        {
            
            return new Container(
                child: new Chat(
                    messages: _messages,
                    onAttachmentPressed: _handleAtachmentPressed,
                    onMessageTap: _handleMessageTap,
                    onPreviewDataFetched: (
                        previewData,
                        message)=>
                    {
                        _handlePreviewDataFetched(message,previewData);
                    },
                    onTextChanged : (_str) => { },
                    onSendPressed: _handleSendPressed,
                    onEndReached: _handleEndReached,
                    //onEndReachedThreshold: 0.65f,
                    user: _user
                )
                
            );
        }
    }
}