Add docs

Signed-off-by: Sahil Kumar <[email protected]>

packages/stream_chat/lib/src/api/attachment_uploader.dart

@@ -3,9 +3,13 @@ import 'package:stream_chat/src/models/attachment_file.dart';
 import '../client.dart';
 import '../extensions/string_extension.dart';
 
-///
+/// Class responsible for uploading images and files from a given channel
 abstract class AttachmentUploader {
+  /// Uploads a image [file] to the given channel.
+  /// Returns image [file] URL once sent successfully.
   ///
+  /// Optionally, access upload progress using [onSendProgress]
+  /// and cancel the request using [cancelToken]
   Future<String> uploadImage(
     AttachmentFile file,
     String channelId,
@@ -14,7 +18,11 @@ abstract class AttachmentUploader {
     CancelToken cancelToken,
   });
 
+  /// Uploads a [file] to the given channel.
+  /// Returns [file] URL once sent successfully.
   ///
+  /// Optionally, access upload progress using [onSendProgress]
+  /// and cancel the request using [cancelToken]
   Future<String> uploadFile(
     AttachmentFile file,
     String channelId,
@@ -24,11 +32,11 @@ abstract class AttachmentUploader {
   });
 }
 
-///
+/// Stream's default implementation of [AttachmentUploader]
 class StreamAttachmentUploader implements AttachmentUploader {
   final StreamChatClient _client;
 
-  ///
+  /// Creates a new [StreamAttachmentUploader] instance.
   const StreamAttachmentUploader(this._client);
 
   @override

packages/stream_chat/lib/src/models/attachment_file.dart

@@ -7,16 +7,16 @@ part 'attachment_file.freezed.dart';
 
 part 'attachment_file.g.dart';
 
-///
+/// Union class to hold various [UploadState] of a attachment.
 @freezed
 abstract class UploadState with _$UploadState {
-  ///
+  /// InProgress state of the union
   const factory UploadState.inProgress({int uploaded, int total}) = InProgress;
 
-  ///
+  /// Success state of the union
   const factory UploadState.success() = Success;
 
-  ///
+  /// Failed state of the union
   const factory UploadState.failed({@required String error}) = Failed;
 
   /// Creates a new instance from a json
@@ -24,15 +24,15 @@ abstract class UploadState with _$UploadState {
       _$UploadStateFromJson(json);
 }
 
-///
+/// Helper extension for UploadState
 extension UploadStateX on UploadState {
-  ///
+  /// Returns true if state is [InProgress]
   bool get isInProgress => this is InProgress;
 
-  ///
+  /// Returns true if state is [Success]
   bool get isSuccess => this is Success;
 
-  ///
+  /// Returns true if state is [Failed]
   bool get isFailed => this is Failed;
 }
 
@@ -40,10 +40,10 @@ Uint8List _fromString(String bytes) => Uint8List.fromList(bytes.codeUnits);
 
 String _toString(Uint8List bytes) => String.fromCharCodes(bytes);
 
-///
+/// The class that contains the information about an attachment file
 @JsonSerializable()
 class AttachmentFile {
-  ///
+  /// Creates a new [AttachmentFile] instance.
   const AttachmentFile({
     this.path,
     this.name,

packages/stream_chat_flutter/lib/src/extension.dart

@@ -34,9 +34,9 @@ extension IterableX<T> on Iterable<T> {
       }).skip(1).toList(growable: false);
 }
 
-///
+/// Useful extension for [PlatformFile]
 extension PlatformFileX on PlatformFile {
-  ///
+  /// Converts the [PlatformFile] into [AttachmentFile]
   AttachmentFile get toAttachmentFile => AttachmentFile(
         path: path,
         name: name,