fix(player): 修正评论面板键盘态布局重叠

lib/pages/player/widgets/drama_comments_sheet.dart

@@ -184,54 +184,67 @@ class _DramaCommentsSheetState extends State<DramaCommentsSheet> {
     final maxHeight = screenLimit < _maxSheetHeight
         ? screenLimit
         : _maxSheetHeight;
-    final focused = _inputFocus.hasFocus;
+    final inputFocused = _inputFocus.hasFocus;
     final keyboardHeight = _keyboardHeight(context);
+    final keyboardOpen = keyboardHeight > 0;
+    final expanded = inputFocused && keyboardOpen;
+    final availableHeight = math.max(0.0, screenLimit - keyboardHeight);
+    final keyboardPanelHeight = math.min(
+      _sheetHeightWithoutKeyboard ?? maxHeight,
+      availableHeight,
+    );
     _measureSheetWithoutKeyboard(keyboardHeight);
-    return GestureDetector(
-      behavior: HitTestBehavior.translucent,
-      onTap: focused ? _inputFocus.unfocus : null,
-      child: SizedBox(
-        key: _sheetMeasureKey,
-        child: Container(
-          key: const Key('player-comments-sheet'),
-          decoration: const BoxDecoration(
-            color: AppColors.card,
-            borderRadius: BorderRadius.vertical(
-              top: Radius.circular(_sheetRadius),
+    return AnimatedPadding(
+      duration: const Duration(milliseconds: 200),
+      curve: Curves.easeOut,
+      padding: EdgeInsets.only(bottom: keyboardHeight),
+      child: GestureDetector(
+        behavior: HitTestBehavior.translucent,
+        onTap: inputFocused ? _inputFocus.unfocus : null,
+        child: SizedBox(
+          key: _sheetMeasureKey,
+          child: Container(
+            key: const Key('player-comments-sheet'),
+            decoration: const BoxDecoration(
+              color: AppColors.card,
+              borderRadius: BorderRadius.vertical(
+                top: Radius.circular(_sheetRadius),
+              ),
             ),
-          ),
-          child: SafeArea(
-            top: false,
-            child: ListenableBuilder(
-              listenable: _controller,
-              builder: (context, _) {
-                final minHeight = _controller.comments.isEmpty
-                    ? (_minSheetHeight < maxHeight
-                          ? _minSheetHeight
-                          : maxHeight)
-                    : 0.0;
-                final pinnedHeight =
-                    keyboardHeight > 0 && _sheetHeightWithoutKeyboard != null
-                    ? math.min(_sheetHeightWithoutKeyboard!, maxHeight)
-                    : null;
-                return ConstrainedBox(
-                  key: const Key('comment-sheet-constraints'),
-                  constraints: pinnedHeight == null
-                      ? BoxConstraints(
-                          minHeight: minHeight,
-                          maxHeight: maxHeight,
-                        )
-                      : BoxConstraints.tightFor(height: pinnedHeight),
-                  child: Padding(
-                    padding: const EdgeInsets.symmetric(horizontal: 16),
-                    child: _content(
-                      context,
-                      focused: focused,
-                      keyboardHeight: keyboardHeight,
+            child: SafeArea(
+              top: false,
+              child: ListenableBuilder(
+                listenable: _controller,
+                builder: (context, _) {
+                  final minHeight = _controller.comments.isEmpty
+                      ? (_minSheetHeight < maxHeight
+                            ? _minSheetHeight
+                            : maxHeight)
+                      : 0.0;
+                  return AnimatedSize(
+                    duration: const Duration(milliseconds: 200),
+                    curve: Curves.easeOut,
+                    alignment: Alignment.bottomCenter,
+                    child: ConstrainedBox(
+                      key: const Key('comment-sheet-constraints'),
+                      constraints: keyboardOpen
+                          ? BoxConstraints.tightFor(height: keyboardPanelHeight)
+                          : BoxConstraints(
+                              minHeight: minHeight,
+                              maxHeight: maxHeight,
+                            ),
+                      child: Padding(
+                        padding: const EdgeInsets.symmetric(horizontal: 16),
+                        child: _content(
+                          context,
+                          expanded: expanded,
+                          keyboardHeight: keyboardHeight,
+                        ),
+                      ),
                     ),
-                  ),
-                );
-              },
+                  );
+                },
+              ),
             ),
           ),
         ),
@@ -241,12 +254,12 @@ class _DramaCommentsSheetState extends State<DramaCommentsSheet> {
 
   Widget _content(
     BuildContext context, {
-    required bool focused,
+    required bool expanded,
     required double keyboardHeight,
   }) {
     final l10n = AppLocalizations.of(context)!;
     final count = _serverCount ?? _controller.exactCount;
-    final composerReserve = focused
+    final composerReserve = expanded
         ? _expandedComposerReserve
         : _composerHeight + _composerTopGap;
     return Column(
@@ -299,18 +312,13 @@ class _DramaCommentsSheetState extends State<DramaCommentsSheet> {
           ),
         ),
         if (_replyTo != null) _replyBanner(l10n, _replyTo!),
-        AnimatedContainer(
-          key: const Key('comment-input-lift'),
-          duration: const Duration(milliseconds: 200),
-          curve: Curves.easeOut,
-          transform: Matrix4.translationValues(0, -keyboardHeight, 0),
-          child: Padding(
-            padding: EdgeInsets.only(
-              top: focused ? 12 : _composerTopGap,
-              bottom: focused ? 12 : 0,
-            ),
-            child: _composer(l10n, focused: focused),
+        Padding(
+          key: const Key('comment-composer-area'),
+          padding: EdgeInsets.only(
+            top: expanded ? 12 : _composerTopGap,
+            bottom: expanded ? 12 : 0,
           ),
+          child: _composer(l10n, focused: expanded),
         ),
       ],
     );