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Live Streaming Widget Customization (Flutter)

LiveCoreWidget is a cross-platform core component for live video streaming, delivering essential features such as hosting, audience viewing, co-hosting, and host PK. Through its widget system, this component enables real-time display of custom information within the video area—such as usernames, user levels, and PK progress bars. This guide provides step-by-step instructions for Flutter developers to quickly implement and customize dedicated video widget components using provided interfaces.

Effect Preview

Co-hosting Video Widget
PK Video Widget







Prerequisites

Before customizing video widgets, ensure you have completed the core live streaming workflow by following Host Start Streaming and Audience Viewing.

Core Principle

LiveCoreWidget enables custom view rendering through the VideoWidgetBuilder delegate. When the live room state changes—for example, when a user takes a mic seat or a PK session starts—LiveCoreWidget automatically invokes delegate methods to determine which view to display. As a developer, you implement these interface methods and return your custom Widget instances.
Callback
Description
Related Business Scenario
CoGuestWidgetBuilder
Builds the widget for audience co-hosting views.
Audience co-hosting, invite to mic
CoHostWidgetBuilder
Builds the widget for cross-room co-hosting (host co-hosting) views.
Host co-hosting
BattleWidgetBuilder
Builds the widget for individual users in PK scenarios (e.g., avatar, score).
Host PK
BattleContainerWidgetBuilder
Builds the overall container for PK scenarios (e.g., background, PK score bar).
Host PK

Customizing Co-hosting Scene Widgets

When an audience member co-hosts with a host, or when hosts co-host across rooms, the live room interface switches from a single-user view to a multi-user layout. In these scenarios, you’ll want to display additional user information—such as nickname, user level, or mute status—to clearly distinguish each mic seat.

Applicable Scenarios

When a host and audience member are co-hosting via video, customize the user info displayed on each mic seat (e.g., nickname, level, mute icon).
When hosts are co-hosting across rooms, adjust the display style for the other host (e.g., nickname, level, mute icon).
Change the default background placeholder when there is no video stream (e.g., show a placeholder avatar).
Customize the view shown for empty mic seats.

View Hierarchy Illustration



Implementation Steps

Note:
You can also refer to the CoGuestWidgets and CoHostWidgets directories in the TUILiveKit open source project for complete implementation examples.

Step 1. Create Custom Widget Components

Define three basic widget classes to display user information, empty mic seat prompts, and a background for when no video stream is available.
Custom user information view:
import 'package:flutter/material.dart';

class CustomInfoWidget extends StatelessWidget {
  final String name;
  final bool isMuted;

  const CustomInfoWidget({
    super.key,
    required this.name,
    required this.isMuted,
  });

  @override
  Widget build(BuildContext context) {
    return Stack(
      children: [
        Text(name),
        if (isMuted) const Icon(Icons.mic_off),
        // Layout parameter code omitted here
      ],
    );
  }
}
Custom empty mic seat view:
import 'package:flutter/material.dart';

class EmptySeatWidget extends StatelessWidget {
  const EmptySeatWidget({super.key});

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: const [
        Icon(Icons.add),
        Text('Invite to co-host'),
        // Image resource loading and layout parameter code omitted here
      ],
    );
  }
}
Custom avatar placeholder for no video stream:
import 'package:flutter/material.dart';

class CustomAvatarWidget extends StatelessWidget {
  final String avatarURL;

  const CustomAvatarWidget({
    super.key,
    required this.avatarURL,
  });

  @override
  Widget build(BuildContext context) {
    // In production, use an image loading library (e.g., CachedNetworkImage) to load avatarURL
    return Image.network(avatarURL);
    // Layout parameter code omitted here
  }
}

Step 2. Implement VideoWidgetBuilder Logic

Create a builder class and implement the VideoWidgetBuilder callbacks coGuestWidgetBuilder (for audience co-hosting) and coHostWidgetBuilder (for host co-hosting), returning your custom widgets as needed.
Implement the coGuestWidgetBuilder callback to return the audience co-hosting video widget:
import 'package:flutter/material.dart';
import 'package:atomic_x_core/atomicxcore.dart';

VideoWidgetBuilder(coGuestWidgetBuilder: (context, seatInfo, viewLayer) {
  final isUserOnSeat = seatInfo.userInfo.userID.isNotEmpty;
  if (viewLayer == ViewLayer.foreground) {
    if (isUserOnSeat) {
      // Occupied mic seat: return custom foreground widget
      return CustomInfoWidget(
        name: seatInfo.userInfo.userName,
        isMuted: seatInfo.userInfo.microphoneStatus == DeviceStatus.off
      );
    } else {
      // Empty mic seat: return custom empty seat widget
      return EmptySeatWidget();
    }
  } else {
    if (isUserOnSeat) {
      // User camera is off: display custom background widget
      return CustomAvatarWidget(avatarURL: seatInfo.userInfo.avatarURL);
    } else {
      return SizedBox.shrink();
    }
  }
})
Implement the coHostWidgetBuilder callback for host co-hosting video widgets:
import 'package:flutter/material.dart';
import 'package:atomic_x_core/atomicxcore.dart';

VideoWidgetBuilder(coHostWidgetBuilder: (context, seatInfo, viewLayer) {
  final isUserOnSeat = seatInfo.userInfo.userID.isNotEmpty;
  if (viewLayer == ViewLayer.foreground) {
    if (isUserOnSeat) {
      // Return custom foreground widget; can use a style different from audience co-hosting
      return CustomInfoWidget(
        name: seatInfo.userInfo.userName,
        isMuted: seatInfo.userInfo.microphoneStatus == DeviceStatus.off
      );
    } else {
      // Return custom empty seat widget; can use a style different from audience co-hosting
      return EmptySeatWidget();
    }
  } else {
    if (isUserOnSeat) {
      // Return custom background widget (shown when camera is off); can use a style different from audience co-hosting
      return CustomAvatarWidget(avatarURL: seatInfo.userInfo.avatarURL);
    } else {
      return SizedBox.shrink();
    }
  }
})

Parameter Descriptions

Parameter
Type
Description
seatInfo
SeatInfo
Mic seat information object containing details about the user occupying the mic seat.
seatInfo.userInfo.userName
String
The nickname of the user on the mic seat.
seatInfo.userInfo.avatarURL
String
The avatar URL of the user on the mic seat.
seatInfo.userInfo.microphoneStatus
DeviceStatus
The microphone status of the user on the mic seat.
seatInfo.userInfo.cameraStatus
DeviceStatus
The camera status of the user on the mic seat.
viewLayer
ViewLayer
View layer enum.
.foreground: The foreground widget, always displayed above the video.
.background: The background widget, displayed below the foreground view and shown only when the user has no video stream (e.g., camera is off). Typically used to display a default avatar or placeholder image.

Customizing Host PK Scene Widgets

PK is the most interactive part of a live streaming session. During PK, the screen is typically divided based on the number of participants. Developers can add PK-specific UI elements—such as PK score bars, score displays above each mic seat, countdown animations, or VS effect icons—to create an engaging competitive atmosphere.

View Hierarchy Illustration


Note:
PK functionality depends on co-hosting. You must establish host co-hosting before initiating a PK session.

Implementation Steps

Step 1. Create Custom UI Components

PK scenarios typically require two types of widgets:
Single-user widget: Displayed above each host’s video window (e.g., score capsule).
Global container: Overlays the entire video area (e.g., VS animation, countdown).
Note：
You can also review the BattleWidgets directory in the TUILiveKit open source project for complete implementation samples.
import 'package:flutter/material.dart';

// Example: Single-user score bar
class MyBattleScoreWidget extends StatelessWidget {
  const MyBattleScoreWidget({super.key});

  @override
  Widget build(BuildContext context) {
    // Internal score display logic
    return const Placeholder();
  }
}

// Example: Global VS panel
class MyBattleContainer extends StatelessWidget {
  const MyBattleContainer({super.key});

  @override
  Widget build(BuildContext context) {
    // Internal countdown and VS animation logic
    return const Placeholder();
  }
}

Step 2. Implement VideoWidgetBuilder Logic

In your VideoWidgetBuilder, implement the remaining PK view builder methods as follows:
import 'package:flutter/material.dart';
import 'package:atomic_x_core/atomicxcore.dart';

VideoWidgetBuilder(
  // Omitted coGuestWidgetBuilder / coHostWidgetBuilder for brevity...
  // 1. Build the PK single-user info widget (displayed above each host's video)
  battleWidgetBuilder: (context, seatInfo) {
    return MyBattleScoreWidget();
  },
  // 2. Build the PK global container widget (displayed above the entire video area)
  battleContainerWidgetBuilder: (context) {
    return MyBattleContainer();
  }
)

Integration and Activation

This is a crucial step: You must inject the VideoWidgetBuilder—with your custom delegate logic—into the core live streaming workflow.
Host Integration:
Before initializing your main container, create the LiveCoreWidget and set the VideoWidgetBuilder via the videoWidgetBuilder parameter.
import 'package:flutter/material.dart';
import 'package:atomic_x_core/atomicxcore.dart';

class AnchorWidget extends StatefulWidget {
  const AnchorWidget({super.key});

  @override
  State<AnchorWidget> createState() => _AnchorWidgetState();
}

class _AnchorWidgetState extends State<AnchorWidget> {
  // Assume liveInfo is already obtained here
  final LiveInfo liveInfo = LiveInfo();

  late final LiveCoreController _liveCoreController;

  @override
  void initState() {
    super.initState();
    // 1. Initialize the LiveCoreWidget controller
    _liveCoreController = LiveCoreController.create(CoreViewType.pushView);
    _liveCoreController.setLiveID(liveInfo.liveID);
  }

  @override
  Widget build(BuildContext context) {
    return LiveCoreWidget(
      // 2. Place the core video component in the parent widget and pass in the controller
      controller: _liveCoreController,
      // 3. Pass the VideoWidgetBuilder with your custom implementation
      videoWidgetBuilder: VideoWidgetBuilder(
        coGuestWidgetBuilder: (context, seatInfo, viewLayer) {
          // Insert your coGuestWidgetBuilder implementation here
          return Placeholder();
        },
        coHostWidgetBuilder: (context, seatInfo, viewLayer) {
          // Insert your coHostWidgetBuilder implementation here
          return Placeholder();
        },
        battleWidgetBuilder: (context, seatInfo) {
          // Insert your battleWidgetBuilder implementation here
          return Placeholder();
        },
        battleContainerWidgetBuilder: (context) {
          // Insert your battleContainerWidgetBuilder implementation here
          return Placeholder();
        }
      )
    );
  }
}
Audience Integration:
Audience integration is similar to host integration. Just set the CoreViewType for LiveCoreController to CoreViewType.pushView.
import 'package:flutter/material.dart';
import 'package:atomic_x_core/atomicxcore.dart';

class AudienceWidget extends StatefulWidget {
  const AudienceWidget({super.key});

  @override
  State<AudienceWidget> createState() => _AudienceWidgetState();
}

class _AudienceWidgetState extends State<AudienceWidget> {
  // Assume liveInfo is already obtained here
  final LiveInfo liveInfo = LiveInfo();

  late final LiveCoreController _liveCoreController;

  @override
  void initState() {
    super.initState();
    // 1. Initialize the LiveCoreWidget controller
    _liveCoreController = LiveCoreController.create(CoreViewType.pushView);
    _liveCoreController.setLiveID(liveInfo.liveID);
  }

  @override
  Widget build(BuildContext context) {
    return LiveCoreWidget(
      // 2. Place the core video component in the parent widget and pass in the controller
      controller: _liveCoreController,
      // 3. Pass the VideoWidgetBuilder with your custom implementation
      videoWidgetBuilder: VideoWidgetBuilder(
        coGuestWidgetBuilder: (context, seatInfo, viewLayer) {
          // Insert your coGuestWidgetBuilder implementation here
          return Placeholder();
        },
        coHostWidgetBuilder: (context, seatInfo, viewLayer) {
          // Insert your coHostWidgetBuilder implementation here
          return Placeholder();
        },
        battleWidgetBuilder: (context, seatInfo) {
          // Insert your battleWidgetBuilder implementation here
          return Placeholder();
        },
        battleContainerWidgetBuilder: (context) {
          // Insert your battleContainerWidgetBuilder implementation here
          return Placeholder();
        }
      )
    );
  }
}

Advanced: Accessing Real-time Business Data

For complex scenarios such as PK, SeatInfo provides only basic mic seat data. If your custom widgets require real-time business data—such as countdowns or PK scores—connect your widgets to the relevant data stores in AtomicXCore.
Store/Component
Function Description
API Documentation
CoGuestStore
Audience co-hosting data: list of co-hosted users, invitation list, application list, etc.
CoHostStore
Host co-hosting data: list of co-hosted users, invitation list, application list, etc.
BattleStore
PK data: current PK info, PK user list, PK score list.

FAQs

I only want to modify the co-hosting view, but keep the default PK view. What should I do?

Simply update the coGuestWidgetBuilder in your VideoWidgetBuilder implementation to return your custom widget, and leave the PK-related builders unchanged.

My custom widget is displayed, but can't be clicked?

Because the foreground view (.foreground) is always rendered above the video layer, ensure your CustomWidget is assigned to the .foreground layer and that its parent widget does not block user interactions.
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