fix(flutter): 评论输入增加登录闸

lib/pages/player/widgets/drama_comments_sheet.dart

@@ -10,6 +10,7 @@ import '../../../core/data/models/drama.dart';
 import '../../../core/data/repositories/comment_repository.dart';
 import '../../../core/data/repositories/interaction_repository.dart';
 import '../../../core/data/services/comment_controller.dart';
+import '../../../core/data/services/auth_controller.dart';
 import '../../../core/formatting/error_text.dart';
 import '../../../core/platform/haptics.dart';
 import '../../../core/theme/app_colors.dart';
@@ -64,8 +65,8 @@ class _DramaCommentsSheetState extends State<DramaCommentsSheet> {
 
   Future<void> _post() async {
     if (_controller.submitting) return;
-    if (_input.text.trim().isEmpty) return;
     if (!await ensureSignedIn(context) || !mounted) return;
+    if (_input.text.trim().isEmpty) return;
     unawaited(context.read<Haptics>().lightImpact());
     final result = await _controller.publish(_input.text, replyTo: _replyTo);
     if (!mounted) return;
@@ -90,6 +91,13 @@ class _DramaCommentsSheetState extends State<DramaCommentsSheet> {
     setState(() => _replyTo = null);
   }
 
+  Future<void> _authenticateForComment() async {
+    _inputFocus.unfocus();
+    await ensureSignedIn(context);
+    if (!mounted || !context.read<AuthController>().isSignedIn) return;
+    _inputFocus.requestFocus();
+  }
+
   Future<void> _like(DramaComment comment) async {
     if (!await ensureSignedIn(context) || !mounted) return;
     unawaited(context.read<Haptics>().lightImpact());
@@ -351,44 +359,52 @@ class _DramaCommentsSheetState extends State<DramaCommentsSheet> {
     );
   }
 
-  Widget _composer(AppLocalizations l10n) => Row(
-    children: [
-      Expanded(
-        child: SizedBox(
-          height: _composerHeight,
-          child: TextField(
-            key: const Key('comment-input'),
-            controller: _input,
-            focusNode: _inputFocus,
-            maxLength: _maxCommentLength,
-            maxLines: 1,
-            textAlignVertical: TextAlignVertical.center,
-            style: const TextStyle(color: AppColors.cream, fontSize: 14),
-            cursorColor: AppColors.blue,
-            decoration: _composerDecoration(l10n.writeComment),
-            onSubmitted: (_) => _post(),
+  Widget _composer(AppLocalizations l10n) {
+    final signedIn = context.watch<AuthController>().isSignedIn;
+    return Row(
+      children: [
+        Expanded(
+          child: SizedBox(
+            height: _composerHeight,
+            child: TextField(
+              key: const Key('comment-input'),
+              controller: _input,
+              focusNode: _inputFocus,
+              readOnly: !signedIn,
+              canRequestFocus: signedIn,
+              maxLength: _maxCommentLength,
+              maxLines: 1,
+              textAlignVertical: TextAlignVertical.center,
+              style: const TextStyle(color: AppColors.cream, fontSize: 14),
+              cursorColor: AppColors.blue,
+              decoration: _composerDecoration(
+                signedIn ? l10n.writeComment : l10n.commentLoginHint,
+              ),
+              onTap: signedIn ? null : _authenticateForComment,
+              onSubmitted: (_) => _post(),
+            ),
           ),
         ),
-      ),
-      const SizedBox(width: 8),
-      SizedBox.square(
-        dimension: _sendButtonSize,
-        child: IconButton.filled(
-          key: const Key('comment-post'),
-          tooltip: l10n.postComment,
-          padding: EdgeInsets.zero,
-          iconSize: 18,
-          onPressed: _controller.submitting ? null : _post,
-          icon: _controller.submitting
-              ? const SizedBox.square(
-                  dimension: 16,
-                  child: CircularProgressIndicator(strokeWidth: 2),
-                )
-              : const Icon(Icons.send_rounded),
+        const SizedBox(width: 8),
+        SizedBox.square(
+          dimension: _sendButtonSize,
+          child: IconButton.filled(
+            key: const Key('comment-post'),
+            tooltip: l10n.postComment,
+            padding: EdgeInsets.zero,
+            iconSize: 18,
+            onPressed: _controller.submitting ? null : _post,
+            icon: _controller.submitting
+                ? const SizedBox.square(
+                    dimension: 16,
+                    child: CircularProgressIndicator(strokeWidth: 2),
+                  )
+                : const Icon(Icons.send_rounded),
+          ),
         ),
-      ),
-    ],
-  );
+      ],
+    );
+  }
 }
 
 class _CommentThread extends StatelessWidget {