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lib/helpers/extensions/color_hex.dart

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+import "package:flutter/widgets.dart";
+
+extension ColorHex on Color {
+  String get hex {
+    final rgb = toARGB32() & 0x00FFFFFF;
+    return "#${rgb.toRadixString(16).padLeft(6, "0")}";
+  }
+}

lib/helpers/extensions/event_to_message.dart

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+import "package:flutter_chat_core/flutter_chat_core.dart";
+import "package:matrix/matrix.dart";
+
+extension EventToMessage on Event {
+  Future<Message?> toMessage({bool mustBeText = false}) async {
+    final replyId = relationshipType == RelationshipTypes.reply
+        ? relationshipEventId
+        : null;
+    final sender = (await fetchSenderUser()) ?? senderFromMemoryOrFallback;
+
+    final newContent = content["m.new_content"] as Map<String, Object?>?;
+    final metadata = {
+      "formatted":
+          newContent?["formatted_body"] ??
+          newContent?["body"] ??
+          content["formatted_body"] ??
+          this.body,
+      "eventType": type,
+      "displayName": sender.displayName ?? sender.id,
+      "txnId": transactionId,
+    };
+
+    final editedAt = relationshipType == RelationshipTypes.edit
+        ? originServerTs
+        : null;
+    final body = newContent?["body"] as String? ?? this.body;
+    final eventId = editedAt == null
+        ? this.eventId
+        : relationshipEventId ?? this.eventId;
+
+    if (redacted) return null;
+
+    final asText =
+        Message.text(
+              metadata: metadata,
+              id: eventId,
+              authorId: senderId,
+              text: body,
+              replyToMessageId: replyId,
+              deliveredAt: originServerTs,
+              editedAt: editedAt,
+            )
+            as TextMessage;
+
+    if (mustBeText) return asText;
+
+    return switch (type) {
+      EventTypes.Encrypted => asText.copyWith(
+        text: "Unable to decrypt message.",
+        metadata: {"formatted": "Unable to decrypt message.", ...metadata},
+      ),
+      EventTypes.Message => switch (messageType) {
+        MessageTypes.Image => Message.image(
+          metadata: metadata,
+          id: eventId,
+          authorId: senderId,
+          text: text,
+          source: (await getAttachmentUri()).toString(),
+          replyToMessageId: replyId,
+          deliveredAt: originServerTs,
+        ),
+        MessageTypes.Audio => Message.audio(
+          metadata: metadata,
+          id: eventId,
+          authorId: senderId,
+          text: text,
+          replyToMessageId: replyId,
+          source: (await getAttachmentUri()).toString(),
+          deliveredAt: originServerTs,
+          duration: Duration(hours: 1),
+        ),
+        MessageTypes.File => Message.file(
+          name: content["filename"].toString(),
+          metadata: metadata,
+          id: eventId,
+          authorId: senderId,
+          source: (await getAttachmentUri()).toString(),
+          replyToMessageId: replyId,
+          deliveredAt: originServerTs,
+        ),
+        _ => asText,
+      },
+      EventTypes.RoomMember => Message.system(
+        metadata: metadata,
+        id: eventId,
+        authorId: senderId,
+        text:
+            "${senderFromMemoryOrFallback.calcDisplayname()} joined the room.",
+      ),
+      EventTypes.Redaction => null,
+      EventTypes.Reaction => null,
+      _ => Message.unsupported(
+        metadata: metadata,
+        id: eventId,
+        authorId: senderId,
+        replyToMessageId: replyId,
+      ),
+    };
+  }
+}

lib/helpers/extensions/list_to_messages.dart

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+import "package:flutter_chat_core/flutter_chat_core.dart";
+import "package:matrix/matrix.dart";
+import "package:nexus/helpers/extensions/event_to_message.dart";
+
+extension ListToMessages on List<MatrixEvent> {
+  Future<List<Message>> toMessages(Room room) async {
+    final messages = await Future.wait(
+      map((event) => Event.fromMatrixEvent(event, room).toMessage()),
+    );
+
+    return {
+      for (var msg in messages.nonNulls.toList().reversed.toList()) msg.id: msg,
+    }.values.toList();
+  }
+}

lib/helpers/extensions/scheme_to_theme.dart

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+import "package:flutter/material.dart";
+
+extension SchemeToTheme on ColorScheme {
+  ThemeData get theme => ThemeData.from(colorScheme: this).copyWith(
+    cardTheme: CardThemeData(color: primaryContainer),
+    appBarTheme: AppBarTheme(
+      titleSpacing: 0,
+      backgroundColor: surfaceContainerLow,
+    ),
+    inputDecorationTheme: const InputDecorationTheme(
+      border: OutlineInputBorder(),
+    ),
+  );
+}