ChatView | API Reference

Namespaces are mirrored: Shiny.Maui.Controls.Chat and Shiny.Blazor.Controls.Chat. Models are identical across platforms except ChatSessionUserInfo (MAUI uses ImageSource/Color; Blazor uses string URL / CSS color).

IChatSessionProvider

Member	Returns	Description
CreateSessionAsync(string[] userIds, CancellationToken)	Task<IChatSession>	Create a new session for the given users
GetSessionAsync(string sessionId, CancellationToken)	Task<IChatSession>	Resolve an existing session; throws ChatSessionException if missing/forbidden

IChatSession : IAsyncDisposable

Properties

Member	Type	Description
Info	ChatSessionInfo	Always current; refreshed before SessionUpdated fires
CurrentUserId	string	Who “me” is — drives bubble alignment + ownership

Methods

Member	Returns	Description
GetMessagesAsync(string? cursorMessageId, MessagePageDirection direction, int count, CancellationToken)	Task<MessagePage>	Cursor paging; null + Older = newest page
SendMessageAsync(OutgoingMessage, CancellationToken)	Task<ChatMessage>	Send; echo carries the same ClientMessageId
ResendMessageAsync(string clientMessageId, CancellationToken)	Task<ChatMessage>	Retry a Failed message
EditMessageAsync(string messageId, string body, CancellationToken)	Task	Edit own message
DeleteMessageAsync(string messageId, CancellationToken)	Task	Delete own message
ReactToMessageAsync(string messageId, string emoji, bool add, CancellationToken)	Task	Toggle a reaction on/off
MarkReadAsync(string[] messageIds, CancellationToken)	Task	Mark messages read (control passes only visible, not-mine, unread ids)
ToggleTypingAsync(bool isTyping, CancellationToken)	Task	Report the current user’s typing state
InviteUserAsync(string userId, CancellationToken)	Task	Invite a user
LeaveAsync(CancellationToken)	Task	Leave the session
RenameAsync(string sessionName, CancellationToken)	Task	Rename the session

Events

Event	Args	Description
MessageReceived	ChatMessage	New inbound message or own-send echo (multi-device)
MessageUpdated	MessageChanged	Edit / reaction / receipt / status change
MessageDeleted	string	Deleted message id
UserTyping	UserTypingEvent	Remote user typing state
UserJoined	ChatSessionUserInfo	A user joined
UserLeft	ChatSessionUserInfo	A user left
SessionUpdated	ChatSessionInfo	Name / users / permitted emojis / permissions changed
ConnectionStateChanged	ChatConnectionState	Connectivity changed

Events may fire off the UI thread — the control marshals them.

Records

ChatMessage

public record ChatMessage(
    string MessageId,
    string? ClientMessageId,
    string SenderId,
    string? Body,
    string? ImageUrl,
    MessageStatus Status,
    string? StatusReason,
    DateTimeOffset Timestamp,
    DateTimeOffset? EditedTimestamp,
    IReadOnlyList<Reaction> Reactions,
    IReadOnlyList<ReadReceipt> ReadReceipts,
    string? Identifier = null,
    IReadOnlyDictionary<string, string>? Metadata = null
);

Other records

public record Reaction(string UserId, string Emoji, DateTimeOffset Timestamp);
public record ReadReceipt(string UserId, DateTimeOffset Timestamp);

public record MessageChanged(ChatMessage Message, MessageChangeKind Change);

public record MessagePage(IReadOnlyList<ChatMessage> Messages, bool HasMore);  // Messages always chronological asc

public record OutgoingMessage(string? Body, OutgoingAttachment? Attachment = null, string ClientMessageId = "");
public record OutgoingAttachment(ChatAttachmentKind Kind, Stream Content, string FileName, string ContentType);

public record ChatSessionInfo(
    string SessionId,
    string SessionName,
    ChatSessionUserInfo[] Users,
    string[]? PermittedEmojis,
    MessageBodyPermissions BodyPermissions,
    ChatSessionPermissions Permissions,
    DateTimeOffset CreatedAt,
    DateTimeOffset? LastReadDate,
    int UnreadMessageCount
);

// MAUI
public record ChatSessionUserInfo(string UserId, string DisplayName, ImageSource? Avatar, Color? BubbleColor, DateTimeOffset JoinedDate);
// Blazor
public record ChatSessionUserInfo(string UserId, string DisplayName, string? AvatarUrl, string? BubbleColor, DateTimeOffset JoinedDate);

public record UserTypingEvent(string UserId, bool IsTyping, DateTimeOffset Timestamp);

Enums

public enum MessageStatus { Sending, Sent, Delivered, Read, Failed, Rejected }
public enum MessageChangeKind { Edited, ReactionChanged, ReadReceiptChanged, StatusChanged }
public enum MessagePageDirection { Older, Newer }
public enum ChatAttachmentKind { Image }   // Video/Audio/File reserved
public enum ChatConnectionState { Connected, Reconnecting, Offline }
public enum SendRejectionKind { MessageTooLarge, TooManyAttachments, AttachmentTooLarge, UnsupportedContent, NotPermitted, Other }

[Flags]
public enum ChatSessionPermissions
{
    None = 0,
    CanSendMessages = 1,
    CanEditMessages = 2,
    CanDeleteMessages = 4,
    CanReactToMessages = 8,
    CanInviteUsers = 16,
    CanLeaveSession = 32,
    CanChangeSessionName = 64,
    CanSendImages = 128,
    Default = CanSendMessages | CanSendImages | CanReactToMessages | CanInviteUsers | CanLeaveSession,
    All = CanSendMessages | CanEditMessages | CanDeleteMessages | CanReactToMessages
        | CanInviteUsers | CanLeaveSession | CanChangeSessionName | CanSendImages
}

[Flags]
public enum MessageBodyPermissions
{
    None = 0,
    Links = 1, Bold = 2, Italics = 4, Underline = 8, Strikethrough = 16, Codeblocks = 32,
    All = Links | Bold | Italics | Underline | Strikethrough | Codeblocks
}

Exceptions

public class ChatSessionException : Exception { }              // GetSessionAsync: missing/forbidden session
public class ChatSendRejectedException : Exception            // send refused — bubble => Rejected, no retry
{
    public SendRejectionKind Kind { get; }
}

ChatView Properties

Property	Type	Default	Notes
Provider	IChatSessionProvider?	null	The integration provider
SessionId	string?	null	Session resolved via GetSessionAsync
PageSize	int	30	Messages fetched per page
OpenImagesInViewer	bool	true	Tap an image bubble → built-in ImageViewer
MyBubbleColor	Color/string	#DCF8C6	Local user bubble color
MyTextColor	Color/string	Black	Local user text color
OtherBubbleColor	Color/string	White	Default other-user bubble (overridden by ChatSessionUserInfo.BubbleColor)
OtherTextColor	Color/string	Black	Other-user text color
ChatBackgroundColor	Color?/string?	null	Messages area background
BubbleFontSize	double	15	MAUI
BubbleFontFamily	string?	null	MAUI
TimestampFontSize	double	11	MAUI
BubbleCornerRadius	double	18	Tail corner stays 4 (MAUI)
PlaceholderText	string	"Type a message..."	Input placeholder
SendButtonText	string	"Send"	Send button label
SendButtonBackgroundColor	Color?	theme	MAUI
SendButtonTextColor	Color?	theme	MAUI
InputBarBackgroundColor	Color?	theme	Area behind the composer
InputBarBorderColor	Color?	theme	Outline of the rounded composer (no separator rule)
InputBar	ChatEntryView	built-in	The hosted composer — read to tweak, assign to replace (The Composer) (MAUI)
MaxInputRows	int	6	Composer growth cap in lines (Blazor)
InputTemplate	RenderFragment?	null	Replaces the built-in composer (Blazor)
InputLeftToolbar	RenderFragment?	null	Markup on the left of the composer’s control row (Blazor)
InputRightToolbar	RenderFragment?	null	Markup on the right of the control row, before send (Blazor)
IsInputBarVisible	bool	true	false for read-only chats
ShowTypingIndicator	bool	true	Enable typing indicators
ScrollToFirstUnread	bool	false	Anchor initial scroll at first unread (via Info.LastReadDate)
InputActions	IList<ChatInputAction>	[]	Custom input-bar actions (MAUI)
CustomBubbleActions	IList<ChatBubbleAction>	[]	Custom bubble actions appended to built-ins (MAUI)
MessageTemplate	DataTemplate?	null	Single content template (MAUI)
MessageTemplateSelector	DataTemplateSelector?	null	Per-message template (MAUI)
UseFeedback	bool	true	Haptic feedback (MAUI)
AdjustForKeyboard	bool	true	iOS keyboard padding; leave on inside a FloatingPanel (MAUI)

ChatView Methods & Events (MAUI)

Member	Description
ScrollToEnd(bool animate)	Scroll to the latest message
ScrollToMessage(string messageId, bool animate)	Scroll to a message by id
SubmitEntry()	Programmatically submit the input text
EntryText (property)	Get/set the input field text
MessageTapped (event)	Fires for non-image bubble taps

Custom Action Hooks (MAUI)

public class ChatInputAction : BindableObject
{
    public string? Text { get; set; }
    public ImageSource? Icon { get; set; }
    public Func<ChatView, Task>? Handler { get; set; }
    public event EventHandler<ChatView>? Clicked;
    public virtual Task InvokeAsync(ChatView chatView);
}

public class ChatBubbleAction : BindableObject
{
    public string? Text { get; set; }
    public ImageSource? Icon { get; set; }
    public Func<ChatMessage, Task>? Handler { get; set; }
    public event EventHandler<ChatMessage>? Clicked;
    public virtual Task InvokeAsync(ChatMessage message);
}

Shiny.Maui.Controls.SpeechAddins ships SpeechToTextTool : ChatInputAction and TextToSpeechBubbleTool : ChatBubbleAction — see Custom Actions.

See Also

• The Provider Interface
• Permissions
• Messages & Paging