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Overview

CometChatMessageHeader is a Widget that showcases the User or Group details in the toolbar. Furthermore, it also presents a typing indicator and a back navigation button for ease of use.
The CometChatMessageHeader is comprised of the following components:
ComponentsDescription
ListItem WidgetThis component’s widget consists of avatar, status indicator , title, and subtitle. The fields are then mapped with the SDK’s user, group class.
Back ButtonBackButton that allows users to navigate back from the current activity or screen to the previous one

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Usage

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Integration

You can launch CometChatMessageHeader directly using Navigator.push, or you can define it as a widget within the build method of your State class.
1. Using Navigator to Launch CometChatMessageHeader
Navigator.push(context, MaterialPageRoute(builder: (context) => CometChatMessageHeader())); // A user or group object is required to launch this widget.
2. Embedding CometChatMessageHeader as a Widget in the build Method
import 'package:cometchat_chat_uikit/cometchat_chat_uikit.dart';
import 'package:flutter/material.dart';

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

  @override
  State<MessageHeader> createState() => _MessageHeaderState();
}

class _MessageHeaderState extends State<MessageHeader> {

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: SafeArea(
            child: CometChatMessageHeader() // A user or group object is required to launch this widget.
        )
    );
  }
}

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Actions

Actions dictate how a widget functions. They are divided into two types: Predefined and User-defined. You can override either type, allowing you to tailor the behavior of the widget to fit your specific needs.
1. onBack
Enhance your application’s functionality by leveraging the onBack feature. This capability allows you to customize the behavior associated with navigating back within your app. Utilize the provided code snippet to override default behaviors and tailor the user experience according to your specific requirements. 
CometChatMessageHeader(
  user: user,
  onBack: () {
    // TODO("Not yet implemented")
  },
)

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Filters

Filters allow you to customize the data displayed in a list within a Widget. You can filter the list based on your specific criteria, allowing for a more customized. Filters can be applied using RequestBuilders of Chat SDK. The CometChatMessageHeader widget does not have any exposed filters.

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Customization

To fit your app’s design requirements, you can customize the appearance of the conversation widget. We provide exposed methods that allow you to modify the experience and behavior according to your specific needs.

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Style

To customize the appearance, you can assign a CometChatMessageHeaderStyle object to the CometChatMessageHeader widget. 
CometChatMessageHeader(
  user: user,
  messageHeaderStyle: CometChatMessageHeaderStyle(
       avatarStyle: CometChatAvatarStyle(
          backgroundColor: Color(0xFFFBAA75),
          borderRadius: BorderRadius.circular(6.67),
       ),
       callButtonsStyle: CometChatCallButtonsStyle(
          voiceCallIconColor: Color(0xFFF76808),
          videoCallIconColor: Color(0xFFF76808),
        ),
    )
)

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Functionality

These are a set of small functional customizations that allow you to fine-tune the overall experience of the widget. With these, you can change text, set custom icons, and toggle the visibility of UI elements.
Here is a code snippet demonstrating how you can customize the functionality of the Message Header widget. 
CometChatMessageHeader(
  user: user,
  showBackButton: true,
  usersStatusVisibility: true,
)

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CometChatMessageHeader Properties

Following is a list of customizations along with their corresponding code snippets:
PropertyData TypeDescription
backButtonWidgetBuilder?Used to set the back button widget.
subtitleViewWidget? Function(Group? group, User? user, BuildContext context)?To set subtitle view for the group or user.
userUser?Set User object, one is mandatory either user or group.
groupGroup?Set Group object, one is mandatory either user or group.
listItemViewWidget Function(Group? group, User? user, BuildContext context)?Set custom view for list item.
messageHeaderStyleCometChatMessageHeaderStyle?Set styling props for message header.
listItemStyleListItemStyle?Style for every list item.
trailingViewList<Widget>? Function(User? user, Group? group, BuildContext context)?Set appbar options for the trailing view.
onBackVoidCallback?Callback triggered on closing the screen.
avatarHeightdouble?Set height for avatar.
avatarWidthdouble?Set width for avatar.
heightdouble?Set height for message header.
paddingEdgeInsetsGeometry?Set padding for message header.
showVideoCallButtonbool?Used to hide/display video call button.
showVoiceCallButtonbool?Used to hide/display voice call button.
leadingStateViewWidget? Function(Group? group, User? user, BuildContext context)?To set leading view for the message header.
titleViewWidget? Function(Group? group, User? user, BuildContext context)?To set the title view for the message header.
auxiliaryButtonViewWidget? Function(Group? group, User? user, BuildContext context)?To set auxiliary view for the message header.

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Advanced

For advanced-level customization, you can set custom views to the widget. This lets you tailor each aspect of the widget to fit your exact needs and application aesthetics. You can create and define your own widget and then incorporate those into the widget.

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auxiliaryButtonView

Allows adding a custom button or additional action next to the title or trailing section. Use Cases:
  • Add a Call button (📞) for quick voice/video calls.
  • Include a Block/Report button for moderation.
  • Implement a Pin Chat feature.
CometChatMessageHeader(
   auxiliaryButtonView: (group, user, context) {
    // return auxiliary view 
  },
)

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ListItemView

The CometChatMessageHeader widget consists of a ListItemView. You can customize the ListItem according to your requirements by using the .setListItemView method. 
CometChatMessageHeader(
  user: user,
  listItemView: (Group? group, User? user, context) {
    return Placeholder(); // Replace this placeholder with your custom widget.
  },
)
Example Here is the complete example for reference:
main.dart
  CometChatMessageHeader(
      user: user,
      group: group,
      listItemView: (group, user, context) {
        return CometChatListItem(
          avatarURL: group != null ? group.icon : user?.avatar,
          avatarName: group != null ? group.name : user?.name,
          avatarStyle: CometChatAvatarStyle(
              borderRadius: BorderRadius.circular(6.67),
              backgroundColor: Color(0xFFAA9EE8)),
          title: group != null ? group.name : user?.name ?? "",
          subtitleView: Text(
            user != null
                ? (user.status == UserStatusConstants.online
                    ? "Online"
                    : "Offline")
                : "${group?.membersCount} members",
            style: TextStyle(
              color: Color(0xFF727272),
              fontSize: 14,
              fontWeight: FontWeight.w400,
            ),
          ),
          tailView: CometChatUIKit.getDataSource()
              .getAuxiliaryHeaderMenu(context, user, group, null),
          style: ListItemStyle(
            titleStyle: TextStyle(
              color: Color(0xFF141414),
              fontSize: 16,
              fontWeight: FontWeight.w500,
            ),
          ),
        );
      },
    ); // Replaced the placeholder with a custom widget.

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leadingStateView

Defines a custom leading view, typically used for the receiver’s profile picture or avatar. Use Cases:
  • Display a circular profile picture with a status indicator.
  • Add a custom badge for special roles (Admin, Verified ✅).
CometChatMessageHeader(
   leadingStateView: (group, user, context) {
    // return leading view 
  },
)

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SubtitleView

You can customize the subtitle widget for each item to meet your specific preferences and needs. 
  CometChatMessageHeader(
      user: user,
      subtitleView: (group, user, context) {
        String subtitle;
        if (group != null) {
          subtitle = "${group.membersCount} . ${group.description}";
        } else {
          subtitle = user?.status ?? '';
        }
        return Text(
          subtitle,
          style: TextStyle(
            fontSize: 12,
            fontWeight: FontWeight.w400,
            color: Color(0XFF727272),
          ),
        );
      },
    )

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trailingView

You can set the Custom trailingView to the CometChatMessageHeader widget. 
CometChatMessageHeader(
  user: user,
  trailingView: (User? user, Group? group, BuildContext context) {
    return [
      IconButton(
                onPressed: () {},
                icon: Icon(
                  Icons.info_outline,
                  color: Color(0xFF141414),
                ),
           )
    ];
  },
)

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BackIcon

You can customize the Back Icon according to your specific requirements by using the .backButton method. 
CometChatMessageHeader(
  user: user,
  backButton: (context) {
    return IconButton(
      icon: Icon(Icons.add_alert_outlined, color: Color(0xFF6851D6)),
      onPressed: () {
        // Navigator.pop(context);
      },
    );
  },
)
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