simple_chat 0.2.7

A simple UI solution for quick integration of IM chat & AI bot chat. Supports customised Message Cell, message grouping, image preview and more.

Simple Chat

A simple UI solution for quick integration of IM chat & AI bot chat.

Supports customised Message Cell, message grouping, image preview and more.

Supported Platforms

• iOS
• Android

Screenshots

Basics

Initialise Controller & View

ChatActionHandler is used to handle events like sending message, user avatar tapping, image preview thumbntail tapping, etc. ChatConfig is optional, you can customise the input box hint text, image max count, etc.

final controller = ChatController(
    config: ChatConfig(
      inputBoxHintText: 'Type a message...',
    ),
    actionHandler: ChatActionHandler(
      onSendMessage: (output) {},
    ),
);

ChatView(
    controller: controller,
    theme: ChatThemeData(
        dark: coloredThemeData,
        light: coloredThemeData,
    ),
)

Config Users

Users configured with id, name, avatarUrl and isCurrentUser flag.

• id is used to identify the user and later display messages under the corresponding user avatar.
• name is used to display in the chat UI.
• avatarUrl is used to display the user avatar.
• isCurrentUser is used to identify if the user is the current user.

await controller.store.addUsers(users: [
    ModelUser(
        id: '1',
        name: 'Lawrence',
        avatarUrl: 'https://example.com/avatar/1.png',
        isCurrentUser: true,
    ),
    ModelUser(
        id: '2',
        name: 'Ciel',
        avatarUrl: 'https://example.com/avatar/2.png',
        isCurrentUser: false,
    ),
]);

Add messages

• isInitial is used to identify if the message is historial message and determine if the message is shown with animation or not.
• userId is used to identify the user who sent the message.
• sequence is used to determine the order of the message.
• displayDatetime is used to determine the display datetime of the message.

await controller.store.addMessage(
    isInitial: !withDelay,
    message: ModelTextMessage(
        id: '$i',
        text: 'Hello, how are you?',
        userId: '1',
        sequence: i,
        displayDatetime: DateTime.now(),
    ),
);

Loading Indicator

Blocking and show loading indicator

final controller = ChatController(
    config: ChatConfig(
        loadingIndicatorType: LoadingIndicatorType.sendBtnLoading,
    ),
);

Non-blocking and show reply generator

await controller.store.showReplyGeneratingIndicator();
await Future.delayed(const Duration(seconds: 3));
await controller.store.hideReplyGeneratingIndicator();

Unread indicator

Indicator with unread count

final controller = ChatController(
    config: ChatConfig(
        showUnreadCount: true,
    ),
    ...
);

Indicator without unread count

final controller = ChatController(
    config: ChatConfig(
        showUnreadCount: false,
    ),
    ...
);

Message status

For each message we can also set status, like sending, failed to send.

await controller.store.updateSendStatus(
    messageId: messageId,
    status: ModelBaseMessageStatus.sending,
);
await controller.store.updateSendStatus(
    messageId: messageId,
    status: ModelBaseMessageStatus.failedToSend,
);

Customisation

Add your custom tool bar

Add a tool bar sticked on the top of the input box and move together while keyboard shown/dismissed.

ChatView(
    toolbar: Container(
    // custom toolbar
    ),
),

Add your custom message cell UI

Define your custom message model

Normally if one user send multiple messages without interruption, they will be grouped together in one message cell. If you want to group them in different message cells, you can set forceNewBlock to true.

class CustomMessage extends ModelBaseMessage {
  @override
  final String id;

  @override
  final String userId;

  @override
  final int sequence;

  @override
  final DateTime displayDatetime;

  @override
  final bool forceNewBlock;

  final String data;

  CustomMessage({
    required this.id,
    required this.userId,
    required this.sequence,
    required this.displayDatetime,
    required this.forceNewBlock,
    required this.data,
  });
}

Define your custom message cell UI

You can use MessageBubble to wrap your custom message cell UI.

class CustomMessageCell extends StatelessWidget {
  final ModelLoadingIndicatorMessage message;
  final bool isMessageFromCurrentUser;
  CustomMessageCell({
    super.key,
    required this.message,
    required this.isMessageFromCurrentUser,
  });

  @override
  Widget build(BuildContext context) {
    return MessageBubble(
      isCurrentUser: isMessageFromCurrentUser,
      padding: const EdgeInsets.all(12),
      ...
    );
  }
}

Register your custom message cell UI with custom message model

After registeration, whenever a message with the custom message model is added, the registered UI will be used to display the message.

controller.viewFactory.register<CustomMessage>(
    (BuildContext context, {
    required CustomMessage message,
    required bool isMessageFromCurrentUser,
}) =>
    CustomMessageCell(
        message: message,
        isMessageFromCurrentUser: isMessageFromCurrentUser,
    ),
);

message cell with customised padding, show/hide avatar

class CustomMessage extends ModelBaseMessage {
    ...
    @override
    // this is to indicate whether to show/hide avatar & avatar placehoding spacing
    bool get showAvatarAndPaddings => false;

    @override
    // this is to customise message view padding
    EdgeInsets? get customContainerPadding => EdgeInsets.zero;
}

The above example will give message view zero padding and hide user avatar for message cell rendering

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