fix(player): 评论入口文字垂直居中

lib/pages/player/widgets/drama_comments_sheet.dart

@@ -457,7 +457,11 @@ class _DramaCommentsSheetState extends State<DramaCommentsSheet> {
     ),
   );
 
-  InputDecoration _composerDecoration(String hint, {required bool focused}) {
+  InputDecoration _composerDecoration(
+    String hint, {
+    required bool focused,
+    required bool multiline,
+  }) {
     final radius = BorderRadius.circular(
       focused ? _expandedInputRadius : _composerRadius,
     );
@@ -467,7 +471,11 @@ class _DramaCommentsSheetState extends State<DramaCommentsSheet> {
     );
     return InputDecoration(
       hintText: hint,
-      hintStyle: const TextStyle(color: AppColors.muted, fontSize: 14),
+      hintStyle: TextStyle(
+        color: AppColors.muted,
+        fontSize: 14,
+        height: multiline ? 1.4 : null,
+      ),
       counterText: '',
       contentPadding: EdgeInsets.symmetric(
         horizontal: 16,
@@ -525,7 +533,7 @@ class _DramaCommentsSheetState extends State<DramaCommentsSheet> {
       child: Container(
         key: const Key('comment-input-placeholder'),
         height: _composerHeight,
-        padding: const EdgeInsets.only(right: 3),
+        padding: const EdgeInsets.only(right: 6),
         decoration: BoxDecoration(
           color: AppColors.commentInput,
           borderRadius: BorderRadius.circular(_composerRadius),
@@ -533,13 +541,21 @@ class _DramaCommentsSheetState extends State<DramaCommentsSheet> {
         child: Row(
           children: [
             Expanded(
-              child: Padding(
-                padding: const EdgeInsets.only(left: 16),
-                child: Text(
-                  signedIn ? l10n.writeComment : l10n.commentLoginHint,
-                  maxLines: 1,
-                  overflow: TextOverflow.ellipsis,
-                  style: const TextStyle(color: AppColors.muted, fontSize: 14),
+              child: Align(
+                alignment: Alignment.centerLeft,
+                child: Padding(
+                  padding: const EdgeInsets.only(left: 16),
+                  child: Text(
+                    signedIn ? l10n.writeComment : l10n.commentLoginHint,
+                    key: const Key('comment-input-placeholder-label'),
+                    maxLines: 1,
+                    overflow: TextOverflow.ellipsis,
+                    style: const TextStyle(
+                      color: AppColors.muted,
+                      fontSize: 14,
+                      height: 1,
+                    ),
+                  ),
                 ),
               ),
             ),
@@ -566,6 +582,7 @@ class _DramaCommentsSheetState extends State<DramaCommentsSheet> {
     required bool hasContent,
     required bool canPost,
   }) {
+    final multiline = _input.text.contains('\n');
     return Column(
       mainAxisSize: MainAxisSize.min,
       crossAxisAlignment: CrossAxisAlignment.stretch,
@@ -587,12 +604,19 @@ class _DramaCommentsSheetState extends State<DramaCommentsSheet> {
             minLines: 1,
             maxLines: 4,
             maxLength: _maxCommentLength,
-            textAlignVertical: TextAlignVertical.top,
-            style: const TextStyle(color: AppColors.cream, fontSize: 15),
+            textAlignVertical: multiline
+                ? TextAlignVertical.top
+                : TextAlignVertical.center,
+            style: TextStyle(
+              color: AppColors.cream,
+              fontSize: 15,
+              height: multiline ? 1.4 : null,
+            ),
             cursorColor: AppColors.blue,
             decoration: _composerDecoration(
               signedIn ? l10n.writeComment : l10n.commentLoginHint,
               focused: true,
+              multiline: multiline,
             ),
             onTap: signedIn ? null : _authenticateForComment,
           ),