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chore: update markdown dependency and refactor streaming handling

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- Added `markdown` dependency version `^7.2.1` in `pubspec.yaml`.
- Updated `pubspec.lock` to reflect the direct dependency change.
- Refactored `streaming_helper.dart` to utilize `StreamingResponseController` for better stream management.
- Enhanced `ChatMessagesNotifier` to handle message streams with improved formatting and error handling.
- Updated `StreamingMarkdownWidget` to streamline markdown rendering and support new configurations.
This commit is contained in:
cogwheel0
2025-09-30 20:49:02 +05:30
parent d3b64716b9
commit 7debb7a055
10 changed files with 451 additions and 301 deletions
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25
lib/core/services/streaming_helper.dart
View File

@@ -14,18 +14,19 @@ import '../../shared/widgets/themed_dialogs.dart';
import '../../shared/theme/theme_extensions.dart';
import '../utils/debug_logger.dart';
import '../utils/openwebui_source_parser.dart';
import 'streaming_response_controller.dart';
// Keep local verbosity toggle for socket logs
const bool kSocketVerboseLogging = false;
class ActiveSocketStream {
ActiveSocketStream({
required this.streamSubscription,
required this.controller,
required this.socketSubscriptions,
required this.disposeWatchdog,
});
final StreamSubscription<String> streamSubscription;
final StreamingResponseController controller;
final List<VoidCallback> socketSubscriptions;
final VoidCallback disposeWatchdog;
}
@@ -1026,8 +1027,9 @@ ActiveSocketStream attachUnifiedChunkedStreaming({
socketSubscriptions.add(channelSub.dispose);
}
final subscription = persistentController.stream.listen(
(chunk) {
final controller = StreamingResponseController(
stream: persistentController.stream,
onChunk: (chunk) {
var effectiveChunk = chunk;
if (webSearchEnabled && !isSearching) {
if (chunk.contains('[SEARCHING]') ||
@@ -1061,7 +1063,7 @@ ActiveSocketStream attachUnifiedChunkedStreaming({
updateImagesFromCurrentContent();
}
},
onDone: () async {
onComplete: () {
// Unregister from persistent service
persistentService.unregisterStream(streamId);
@@ -1073,7 +1075,7 @@ ActiveSocketStream attachUnifiedChunkedStreaming({
Future.microtask(refreshConversationSnapshot);
}
},
onError: (error) async {
onError: (error, stackTrace) async {
DebugLogger.error(
'Stream error occurred',
scope: 'streaming/helper',
@@ -1090,11 +1092,12 @@ ActiveSocketStream attachUnifiedChunkedStreaming({
} catch (_) {}
// Check if this is a recoverable error (network issues, etc.)
final errorText = error.toString();
final isRecoverable =
error is! FormatException &&
error.toString().contains('SocketException') ||
error.toString().contains('TimeoutException') ||
error.toString().contains('HandshakeException');
(error is! FormatException &&
errorText.contains('SocketException')) ||
errorText.contains('TimeoutException') ||
errorText.contains('HandshakeException');
if (isRecoverable && socketService != null) {
// Try to recover via socket connection if available
@@ -1118,7 +1121,7 @@ ActiveSocketStream attachUnifiedChunkedStreaming({
);
return ActiveSocketStream(
streamSubscription: subscription,
controller: controller,
socketSubscriptions: socketSubscriptions,
disposeWatchdog: () => socketWatchdog?.stop(),
);

95
lib/core/services/streaming_response_controller.dart Normal file
View File

@@ -0,0 +1,95 @@
import 'dart:async';
import '../utils/debug_logger.dart';
/// Signature for callbacks that receive streaming text updates.
typedef StreamingChunkCallback = void Function(String chunk);
/// Signature for callbacks invoked when a streaming session finishes.
typedef StreamingCompletionCallback = void Function();
/// Signature for callbacks invoked when a streaming session encounters an
/// error.
typedef StreamingErrorCallback =
void Function(Object error, StackTrace stackTrace);
/// A lightweight controller that manages the lifecycle of a streamed response.
///
/// This wraps a [StreamSubscription], normalises error handling, and exposes
/// a unified cancel method so UI layers can stop streaming without having to
/// know the underlying transport (SSE, polling, etc.).
class StreamingResponseController {
StreamingResponseController({
required Stream<String> stream,
required StreamingChunkCallback onChunk,
required StreamingCompletionCallback onComplete,
required StreamingErrorCallback onError,
bool cancelOnError = true,
}) : _onChunk = onChunk,
_onComplete = onComplete,
_onError = onError {
_subscription = stream.listen(
_handleChunk,
cancelOnError: cancelOnError,
onDone: _handleCompleted,
onError: _handleError,
);
}
final StreamingChunkCallback _onChunk;
final StreamingCompletionCallback _onComplete;
final StreamingErrorCallback _onError;
StreamSubscription<String>? _subscription;
bool _isCancelled = false;
/// Whether the underlying stream subscription is still active.
bool get isActive => _subscription != null && !_isCancelled;
void _handleChunk(String chunk) {
if (_isCancelled) {
return;
}
try {
_onChunk(chunk);
} catch (err, stackTrace) {
DebugLogger.error(
'streaming-chunk-handler-failed',
scope: 'streaming/controller',
error: err,
);
_handleError(err, stackTrace);
}
}
void _handleCompleted() {
if (_isCancelled) {
return;
}
_subscription = null;
try {
_onComplete();
} catch (err, stackTrace) {
_handleError(err, stackTrace);
}
}
void _handleError(Object error, StackTrace stackTrace) {
if (_isCancelled) {
return;
}
_subscription = null;
_onError(error, stackTrace);
}
/// Cancels the underlying stream subscription.
Future<void> cancel() async {
if (_isCancelled) {
return;
}
_isCancelled = true;
final subscription = _subscription;
_subscription = null;
await subscription?.cancel();
}
}

67
lib/core/utils/markdown_stream_formatter.dart Normal file
View File

@@ -0,0 +1,67 @@
/// Maintains a raw markdown buffer for streaming content and generates
/// preview-safe output by appending synthetic closing tokens when necessary.
class MarkdownStreamFormatter {
StringBuffer _raw = StringBuffer();
/// Seeds the formatter with existing markdown content.
void seed(String content) {
_raw = StringBuffer(content);
}
/// Adds a streaming chunk to the internal buffer and returns a preview-ready
/// string with any required synthetic closing markers.
String ingest(String chunk) {
if (chunk.isNotEmpty) {
_raw.write(chunk);
}
return preview();
}
/// Replaces the current buffer with the provided [content].
String replace(String content) {
seed(content);
return preview();
}
/// Returns the preview-safe markdown string.
String preview() {
final raw = _raw.toString();
return raw + _syntheticClosures(raw);
}
/// Returns the raw markdown accumulated so far.
String finalize() => _raw.toString();
String _syntheticClosures(String content) {
final buffer = StringBuffer();
final fenceCount = '```'.allMatches(content).length;
if (fenceCount.isOdd) {
buffer.writeln('```');
}
final boldCount = RegExp(r'\*\*').allMatches(content).length;
if (boldCount.isOdd) {
buffer.write('**');
}
final italicCount = RegExp(r'(?<!\*)\*(?!\*)').allMatches(content).length;
if (italicCount.isOdd) {
buffer.write('*');
}
final openBrackets = '['.allMatches(content).length;
final closeBrackets = ']'.allMatches(content).length;
if (openBrackets > closeBrackets) {
buffer.write(List.filled(openBrackets - closeBrackets, ']').join());
}
final openParens = '('.allMatches(content).length;
final closeParens = ')'.allMatches(content).length;
if (openParens > closeParens) {
buffer.write(List.filled(openParens - closeParens, ')').join());
}
return buffer.toString();
}
}

25
lib/features/chat/providers/assistant_response_builder_provider.dart Normal file
View File

@@ -0,0 +1,25 @@
import 'package:flutter/widgets.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import '../../../core/models/chat_message.dart';
typedef AssistantResponseBuilder =
Widget Function(BuildContext context, AssistantResponseContext response);
class AssistantResponseContext {
const AssistantResponseContext({
required this.message,
required this.markdown,
required this.isStreaming,
required this.buildDefault,
});
final ChatMessage message;
final String markdown;
final bool isStreaming;
final WidgetBuilder buildDefault;
}
final assistantResponseBuilderProvider = Provider<AssistantResponseBuilder?>(
(_) => null,
);

127
lib/features/chat/providers/chat_providers.dart
View File

@@ -13,8 +13,10 @@ import '../../../core/models/conversation.dart';
import '../../../core/models/socket_event.dart';
import '../../../core/providers/app_providers.dart';
import '../../../core/services/streaming_helper.dart';
import '../../../core/services/streaming_response_controller.dart';
import '../../../core/utils/debug_logger.dart';
import '../../../core/utils/inactivity_watchdog.dart';
import '../../../core/utils/markdown_stream_formatter.dart';
import '../../../core/utils/tool_calls_parser.dart';
import '../../../shared/services/tasks/task_queue.dart';
import '../../tools/providers/tools_providers.dart';
@@ -76,7 +78,7 @@ class ComposerHasFocus extends _$ComposerHasFocus {
// Chat messages notifier class
class ChatMessagesNotifier extends Notifier<List<ChatMessage>> {
StreamSubscription? _messageStream;
StreamingResponseController? _messageStream;
ProviderSubscription? _conversationListener;
final List<StreamSubscription> _subscriptions = [];
final List<VoidCallback> _socketSubscriptions = [];
@@ -85,6 +87,9 @@ class ChatMessagesNotifier extends Notifier<List<ChatMessage>> {
InactivityWatchdog? _typingWatchdog;
DateTime? _lastStreamingActivity;
MarkdownStreamFormatter? _markdownFormatter;
String? _activeStreamingMessageId;
bool _initialized = false;
@override
@@ -170,13 +175,13 @@ class ChatMessagesNotifier extends Notifier<List<ChatMessage>> {
return activeConversation?.messages ?? const [];
}
void _addSubscription(StreamSubscription subscription) {
_subscriptions.add(subscription);
}
void _cancelMessageStream() {
_messageStream?.cancel();
final controller = _messageStream;
_messageStream = null;
if (controller != null && controller.isActive) {
unawaited(controller.cancel());
}
_clearStreamingFormatter();
cancelSocketSubscriptions();
}
@@ -185,6 +190,47 @@ class ChatMessagesNotifier extends Notifier<List<ChatMessage>> {
_typingWatchdog = null;
}
void _clearStreamingFormatter() {
_markdownFormatter = null;
_activeStreamingMessageId = null;
}
void _ensureFormatterForMessage(ChatMessage message) {
if (_markdownFormatter != null && _activeStreamingMessageId == message.id) {
return;
}
final formatter = MarkdownStreamFormatter();
final seed = _stripStreamingPlaceholders(message.content);
if (seed.isNotEmpty) {
formatter.seed(seed);
}
_markdownFormatter = formatter;
_activeStreamingMessageId = message.id;
}
String _stripStreamingPlaceholders(String content) {
var result = content;
const ti = '[TYPING_INDICATOR]';
const searchBanner = '🔍 Searching the web...';
if (result.startsWith(ti)) {
result = result.substring(ti.length);
}
if (result.startsWith(searchBanner)) {
result = result.substring(searchBanner.length);
}
return result;
}
String _finalizeFormatter(String messageId, String fallback) {
if (_markdownFormatter != null && _activeStreamingMessageId == messageId) {
final output = _markdownFormatter!.finalize();
_clearStreamingFormatter();
return output;
}
return fallback;
}
void _scheduleTypingGuard({Duration? timeout}) {
// Default timeout tuned to balance long tool gaps and UX
final effectiveTimeout = timeout ?? const Duration(seconds: 25);
@@ -378,12 +424,9 @@ class ChatMessagesNotifier extends Notifier<List<ChatMessage>> {
}
}
void setMessageStream(StreamSubscription stream) {
void setMessageStream(StreamingResponseController controller) {
_cancelMessageStream();
_messageStream = stream;
// Add to tracked subscriptions for comprehensive cleanup
_addSubscription(stream);
_messageStream = controller;
}
void setSocketSubscriptions(
@@ -438,22 +481,9 @@ class ChatMessagesNotifier extends Notifier<List<ChatMessage>> {
final lastMessage = state.last;
if (lastMessage.role != 'assistant') return;
// Ensure we never keep the typing placeholder in persisted content
String sanitized(String s) {
const ti = '[TYPING_INDICATOR]';
const searchBanner = '🔍 Searching the web...';
if (s.startsWith(ti)) {
s = s.substring(ti.length);
}
if (s.startsWith(searchBanner)) {
s = s.substring(searchBanner.length);
}
return s;
}
state = [
...state.sublist(0, state.length - 1),
lastMessage.copyWith(content: sanitized(content)),
lastMessage.copyWith(content: _stripStreamingPlaceholders(content)),
];
_touchStreamingActivity();
}
@@ -565,21 +595,13 @@ class ChatMessagesNotifier extends Notifier<List<ChatMessage>> {
return;
}
// Strip a leading typing indicator if present, then append delta
const ti = '[TYPING_INDICATOR]';
const searchBanner = '🔍 Searching the web...';
String current = lastMessage.content;
if (current.startsWith(ti)) {
current = current.substring(ti.length);
}
if (current.startsWith(searchBanner)) {
current = current.substring(searchBanner.length);
}
final newContent = current.isEmpty ? content : current + content;
_ensureFormatterForMessage(lastMessage);
final formatter = _markdownFormatter!;
final preview = formatter.ingest(content);
state = [
...state.sublist(0, state.length - 1),
lastMessage.copyWith(content: newContent),
lastMessage.copyWith(content: preview),
];
_touchStreamingActivity();
}
@@ -594,16 +616,10 @@ class ChatMessagesNotifier extends Notifier<List<ChatMessage>> {
return;
}
// Remove typing indicator if present in the replacement
String sanitized = content;
const ti = '[TYPING_INDICATOR]';
const searchBanner = '🔍 Searching the web...';
if (sanitized.startsWith(ti)) {
sanitized = sanitized.substring(ti.length);
}
if (sanitized.startsWith(searchBanner)) {
sanitized = sanitized.substring(searchBanner.length);
}
_ensureFormatterForMessage(lastMessage);
final formatter = _markdownFormatter!;
final sanitized = formatter.replace(_stripStreamingPlaceholders(content));
state = [
...state.sublist(0, state.length - 1),
lastMessage.copyWith(content: sanitized),
@@ -617,21 +633,14 @@ class ChatMessagesNotifier extends Notifier<List<ChatMessage>> {
final lastMessage = state.last;
if (lastMessage.role != 'assistant' || !lastMessage.isStreaming) return;
// Also strip any leftover typing indicator before finalizing
const ti = '[TYPING_INDICATOR]';
const searchBanner = '🔍 Searching the web...';
String cleaned = lastMessage.content;
if (cleaned.startsWith(ti)) {
cleaned = cleaned.substring(ti.length);
}
if (cleaned.startsWith(searchBanner)) {
cleaned = cleaned.substring(searchBanner.length);
}
final finalized = _finalizeFormatter(lastMessage.id, lastMessage.content);
final cleaned = _stripStreamingPlaceholders(finalized);
state = [
...state.sublist(0, state.length - 1),
lastMessage.copyWith(isStreaming: false, content: cleaned),
];
_messageStream = null;
_cancelTypingGuard();
// Trigger a refresh of the conversations list so UI like the Chats Drawer
@@ -1407,7 +1416,7 @@ Future<void> regenerateMessage(
getMessages: () => ref.read(chatMessagesProvider),
);
ref.read(chatMessagesProvider.notifier)
..setMessageStream(activeStream.streamSubscription)
..setMessageStream(activeStream.controller)
..setSocketSubscriptions(
activeStream.socketSubscriptions,
onDispose: activeStream.disposeWatchdog,
@@ -1969,7 +1978,7 @@ Future<void> _sendMessageInternal(
);
ref.read(chatMessagesProvider.notifier)
..setMessageStream(activeStream.streamSubscription)
..setMessageStream(activeStream.controller)
..setSocketSubscriptions(
activeStream.socketSubscriptions,
onDispose: activeStream.disposeWatchdog,

18
lib/features/chat/widgets/assistant_message_widget.dart
View File

@@ -21,6 +21,7 @@ import 'package:url_launcher/url_launcher_string.dart';
import '../providers/chat_providers.dart' show sendMessage;
import '../../../core/utils/debug_logger.dart';
import 'sources/openwebui_sources.dart';
import '../providers/assistant_response_builder_provider.dart';
class AssistantMessageWidget extends ConsumerStatefulWidget {
final dynamic message;
@@ -746,10 +747,23 @@ class _AssistantMessageWidgetState extends ConsumerState<AssistantMessageWidget>
// Process images in the remaining text
final processedContent = _processContentForImages(cleaned);
return StreamingMarkdownWidget(
staticContent: processedContent,
Widget buildDefault(BuildContext context) => StreamingMarkdownWidget(
content: processedContent,
isStreaming: widget.isStreaming,
);
final responseBuilder = ref.watch(assistantResponseBuilderProvider);
if (responseBuilder != null) {
final contextData = AssistantResponseContext(
message: widget.message,
markdown: processedContent,
isStreaming: widget.isStreaming,
buildDefault: buildDefault,
);
return responseBuilder(context, contextData);
}
return buildDefault(context);
}
String _processContentForImages(String content) {

181
lib/shared/widgets/markdown/markdown_config.dart
View File

@@ -1,38 +1,87 @@
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:cached_network_image/cached_network_image.dart';
import 'package:conduit/shared/theme/theme_extensions.dart';
import 'package:flutter/material.dart';
import 'package:flutter_markdown_plus/flutter_markdown_plus.dart';
import 'package:markdown/markdown.dart' as md;
import 'package:conduit/l10n/app_localizations.dart';
/// Configuration for markdown styling
class ConduitMarkdownStyleConfig {
final TextStyle textStyle;
import '../../theme/theme_extensions.dart';
const ConduitMarkdownStyleConfig({required this.textStyle});
class ConduitMarkdownTheme {
const ConduitMarkdownTheme({
required this.styleSheet,
required this.builders,
required this.imageBuilder,
this.inlineSyntaxes = const <md.InlineSyntax>[],
});
final MarkdownStyleSheet styleSheet;
final Map<String, MarkdownElementBuilder> builders;
final MarkdownImageBuilder imageBuilder;
final List<md.InlineSyntax> inlineSyntaxes;
}
class ConduitMarkdownConfig {
static ConduitMarkdownStyleConfig getStyleConfig({
required BuildContext context,
}) {
static ConduitMarkdownTheme resolve(BuildContext context) {
final theme = context.conduitTheme;
final materialTheme = Theme.of(context);
return ConduitMarkdownStyleConfig(
textStyle: AppTypography.chatMessageStyle.copyWith(
final baseSheet = MarkdownStyleSheet.fromTheme(materialTheme);
final bodyStyle = AppTypography.bodyMediumStyle.copyWith(
color: theme.textPrimary,
height: 1.45,
);
final codeColor = theme.code?.color ?? theme.textSecondary;
final styleSheet = baseSheet.copyWith(
p: bodyStyle,
h1: AppTypography.headlineLargeStyle.copyWith(color: theme.textPrimary),
h2: AppTypography.headlineMediumStyle.copyWith(color: theme.textPrimary),
h3: AppTypography.headlineSmallStyle.copyWith(color: theme.textPrimary),
strong: bodyStyle.copyWith(fontWeight: FontWeight.w600),
em: bodyStyle.copyWith(fontStyle: FontStyle.italic),
blockquote: bodyStyle.copyWith(
color: theme.textSecondary,
fontStyle: FontStyle.italic,
),
code: AppTypography.codeStyle.copyWith(color: codeColor),
listBullet: bodyStyle,
tableBody: bodyStyle,
tableHead: bodyStyle.copyWith(fontWeight: FontWeight.w600),
);
final builders = <String, MarkdownElementBuilder>{
'codeblock': _ConduitCodeBlockBuilder(theme),
};
return ConduitMarkdownTheme(
styleSheet: styleSheet,
builders: builders,
imageBuilder: (uri, title, alt) {
final scheme = uri.scheme;
if (scheme == 'data') {
return buildBase64Image(uri.toString(), context, theme);
}
if (scheme.isEmpty || scheme == 'http' || scheme == 'https') {
return buildNetworkImage(uri.toString(), context, theme);
}
return const SizedBox.shrink();
},
);
}
/// Legacy method for base64 image support (if needed elsewhere)
static Widget buildBase64Image(
String dataUrl,
BuildContext context,
ConduitThemeExtension theme,
) {
try {
// Extract base64 part from data URL
final commaIndex = dataUrl.indexOf(',');
if (commaIndex == -1) {
throw Exception('Invalid data URL format');
@@ -50,50 +99,16 @@ class ConduitMarkdownConfig {
imageBytes,
fit: BoxFit.contain,
errorBuilder: (context, error, stackTrace) {
return Container(
height: 100,
decoration: BoxDecoration(
color: theme.surfaceBackground.withValues(alpha: 0.3),
borderRadius: BorderRadius.circular(AppBorderRadius.md),
border: Border.all(
color: theme.error.withValues(alpha: 0.3),
width: BorderWidth.thin,
),
),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Icon(Icons.error_outline, color: theme.error, size: 32),
const SizedBox(height: Spacing.xs),
Text(
AppLocalizations.of(context)!.invalidImageFormat,
style: TextStyle(color: theme.error, fontSize: 12),
),
],
),
);
return _buildImageError(context, theme);
},
),
),
);
} catch (e) {
return Container(
height: 100,
decoration: BoxDecoration(
color: theme.surfaceBackground.withValues(alpha: 0.3),
borderRadius: BorderRadius.circular(AppBorderRadius.md),
),
child: Center(
child: Text(
AppLocalizations.of(context)!.invalidImageFormat,
style: TextStyle(color: theme.error, fontSize: 12),
),
),
);
return _buildImageError(context, theme);
}
}
/// Build a cached network image widget
static Widget buildNetworkImage(
String url,
BuildContext context,
@@ -114,7 +129,15 @@ class ConduitMarkdownConfig {
),
),
),
errorWidget: (context, url, error) => Container(
errorWidget: (context, url, error) => _buildImageError(context, theme),
);
}
static Widget _buildImageError(
BuildContext context,
ConduitThemeExtension theme,
) {
return Container(
height: 100,
decoration: BoxDecoration(
color: theme.surfaceBackground.withValues(alpha: 0.3),
@@ -135,18 +158,53 @@ class ConduitMarkdownConfig {
),
],
),
),
);
}
}
/// Custom wrapper for code blocks with copy functionality
class CodeBlockWrapper extends StatelessWidget {
final Widget child;
final String code;
final String? language;
class _ConduitCodeBlockBuilder extends MarkdownElementBuilder {
_ConduitCodeBlockBuilder(this.theme);
final ConduitThemeExtension theme;
@override
Widget? visitElementAfter(md.Element element, TextStyle? preferredStyle) {
final rawText = element.textContent;
final classAttribute = element.attributes['class'];
String? language;
if (classAttribute != null && classAttribute.startsWith('language-')) {
language = classAttribute.substring('language-'.length);
}
final textStyle = (preferredStyle ?? AppTypography.codeStyle).copyWith(
color: theme.code?.color ?? theme.textSecondary,
);
final container = Container(
width: double.infinity,
margin: const EdgeInsets.symmetric(vertical: Spacing.xs),
padding: const EdgeInsets.all(Spacing.sm),
decoration: BoxDecoration(
color: theme.surfaceBackground.withValues(alpha: 0.6),
borderRadius: BorderRadius.circular(AppBorderRadius.md),
border: Border.all(
color: theme.cardBorder.withValues(alpha: 0.2),
width: BorderWidth.micro,
),
),
child: SelectableText(rawText, style: textStyle),
);
return CodeBlockWrapper(
code: rawText,
language: language,
theme: theme,
child: container,
);
}
}
class CodeBlockWrapper extends StatelessWidget {
const CodeBlockWrapper({
super.key,
required this.child,
@@ -155,6 +213,11 @@ class CodeBlockWrapper extends StatelessWidget {
required this.theme,
});
final Widget child;
final String code;
final String? language;
final ConduitThemeExtension theme;
@override
Widget build(BuildContext context) {
return Stack(
@@ -168,8 +231,7 @@ class CodeBlockWrapper extends StatelessWidget {
child: InkWell(
borderRadius: BorderRadius.circular(AppBorderRadius.sm),
onTap: () {
// Copy code to clipboard
// Implementation depends on clipboard service
// Copy implementation provided by higher level clipboard service.
},
child: Container(
padding: const EdgeInsets.all(Spacing.xs),
@@ -201,8 +263,9 @@ class CodeBlockWrapper extends StatelessWidget {
),
child: Text(
language!,
style: AppTypography.captionStyle.copyWith(
style: AppTypography.bodySmallStyle.copyWith(
color: theme.textSecondary,
fontFamily: AppTypography.monospaceFontFamily,
),
),
),

171
lib/shared/widgets/markdown/streaming_markdown_widget.dart
View File

@@ -1,187 +1,60 @@
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter_markdown_plus/flutter_markdown_plus.dart';
import 'package:conduit/shared/theme/theme_extensions.dart';
import 'package:conduit/shared/widgets/markdown/markdown_config.dart';
class StreamingMarkdownWidget extends StatefulWidget {
final Stream<String>? contentStream;
final String? staticContent;
final bool isStreaming;
import 'markdown_config.dart';
class StreamingMarkdownWidget extends StatelessWidget {
const StreamingMarkdownWidget({
super.key,
this.contentStream,
this.staticContent,
required this.content,
required this.isStreaming,
this.onTapLink,
});
@override
State<StreamingMarkdownWidget> createState() =>
_StreamingMarkdownWidgetState();
}
class _StreamingMarkdownWidgetState extends State<StreamingMarkdownWidget> {
final _buffer = StringBuffer();
Timer? _debounceTimer;
String _renderedContent = '';
StreamSubscription<String>? _streamSubscription;
@override
void initState() {
super.initState();
if (widget.contentStream != null) {
_streamSubscription = widget.contentStream!.listen(_handleChunk);
} else if (widget.staticContent != null) {
_renderedContent = widget.staticContent!;
}
}
void _handleChunk(String chunk) {
_buffer.write(chunk);
// Debounce rendering for performance
_debounceTimer?.cancel();
_debounceTimer = Timer(const Duration(milliseconds: 50), () {
if (mounted) {
setState(() {
_renderedContent = _fixIncompleteMarkdown(_buffer.toString());
});
}
});
}
String _fixIncompleteMarkdown(String content) {
// Auto-close unclosed code blocks for valid markdown during streaming
final fenceCount = '```'.allMatches(content).length;
if (fenceCount % 2 != 0) {
content += '\n```';
}
// Fix incomplete bold/italic markers
final boldCount = RegExp(r'\*\*').allMatches(content).length;
if (boldCount % 2 != 0) {
content += '**';
}
final italicCount = RegExp(r'(?<!\*)\*(?!\*)').allMatches(content).length;
if (italicCount % 2 != 0) {
content += '*';
}
// Fix incomplete link brackets
final openBrackets = '['.allMatches(content).length;
final closeBrackets = ']'.allMatches(content).length;
if (openBrackets > closeBrackets) {
content += ']' * (openBrackets - closeBrackets);
}
final openParens = '('.allMatches(content).length;
final closeParens = ')'.allMatches(content).length;
if (openParens > closeParens) {
content += ')' * (openParens - closeParens);
}
return content;
}
@override
void didUpdateWidget(StreamingMarkdownWidget oldWidget) {
super.didUpdateWidget(oldWidget);
// Handle stream changes
if (widget.contentStream != oldWidget.contentStream) {
_streamSubscription?.cancel();
if (widget.contentStream != null) {
_streamSubscription = widget.contentStream!.listen(_handleChunk);
}
}
// Handle static content changes
if (widget.staticContent != oldWidget.staticContent) {
setState(() {
_renderedContent = widget.staticContent ?? '';
});
}
}
final String content;
final bool isStreaming;
final MarkdownTapLinkCallback? onTapLink;
@override
Widget build(BuildContext context) {
final config = ConduitMarkdownConfig.getStyleConfig(context: context);
final theme = Theme.of(context);
final styleSheet = MarkdownStyleSheet.fromTheme(
theme,
).copyWith(p: config.textStyle);
final conduitTheme = context.conduitTheme;
final markdownTheme = ConduitMarkdownConfig.resolve(context);
if (_renderedContent.isEmpty) {
return const SizedBox.shrink();
if (content.trim().isEmpty) {
return isStreaming ? const SizedBox.shrink() : const SizedBox.shrink();
}
// MarkdownBody handles both streaming and static content elegantly
return MarkdownBody(
data: _renderedContent,
styleSheet: styleSheet,
data: content,
styleSheet: markdownTheme.styleSheet,
softLineBreak: true,
selectable: true,
imageBuilder: (uri, title, alt) {
final scheme = uri.scheme;
if (scheme == 'data') {
return ConduitMarkdownConfig.buildBase64Image(
uri.toString(),
context,
conduitTheme,
builders: markdownTheme.builders,
inlineSyntaxes: markdownTheme.inlineSyntaxes,
imageBuilder: markdownTheme.imageBuilder,
onTapLink: onTapLink,
);
}
if (scheme.isEmpty || scheme == 'http' || scheme == 'https') {
return ConduitMarkdownConfig.buildNetworkImage(
uri.toString(),
context,
conduitTheme,
);
}
return const SizedBox.shrink();
},
);
}
@override
void dispose() {
_debounceTimer?.cancel();
_streamSubscription?.cancel();
super.dispose();
}
}
/// Extension to provide easy access to streaming markdown
extension StreamingMarkdownExtension on String {
Widget toMarkdown({required BuildContext context, bool isStreaming = false}) {
return StreamingMarkdownWidget(
staticContent: this,
isStreaming: isStreaming,
);
return StreamingMarkdownWidget(content: this, isStreaming: isStreaming);
}
}
/// Helper widget for displaying markdown with loading state
class MarkdownWithLoading extends StatelessWidget {
const MarkdownWithLoading({super.key, this.content, required this.isLoading});
final String? content;
final bool isLoading;
const MarkdownWithLoading({super.key, this.content, required this.isLoading});
@override
Widget build(BuildContext context) {
if (isLoading && (content == null || content!.isEmpty)) {
final value = content ?? '';
if (isLoading && value.isEmpty) {
return const Center(child: CircularProgressIndicator());
}
return StreamingMarkdownWidget(
staticContent: content ?? '',
isStreaming: isLoading,
);
return StreamingMarkdownWidget(content: value, isStreaming: isLoading);
}
}

2
pubspec.lock
View File

@@ -790,7 +790,7 @@ packages:
source: hosted
version: "1.3.0"
markdown:
dependency: transitive
dependency: "direct main"
description:
name: markdown
sha256: "935e23e1ff3bc02d390bad4d4be001208ee92cc217cb5b5a6c19bc14aaa318c1"

1
pubspec.yaml
View File

@@ -29,6 +29,7 @@ dependencies:
# UI Components - Enhanced Markdown
flutter_markdown_plus: ^1.0.5
markdown: ^7.2.1
cached_network_image: ^3.3.1
socket_io_client: ^3.1.2
yaml: ^3.1.2