现在弹幕设置里允许将滚动弹幕显示区域调节为单行显示 closed #165

Author: MCDFsteve

lib/danmaku_canvas/lib/danmaku_screen.dart

@@ -522,13 +522,21 @@ class _DanmakuScreenState extends State<DanmakuScreen>
         _viewWidth = constraints.maxWidth;
       }
 
-      _trackCount =
-          (constraints.maxHeight * _option.area / _danmakuHeight).floor();
+      if (_option.area <= 0 || _option.area.isNaN || _option.area.isInfinite) {
+        // 0.0 表示“单行显示”
+        _trackCount = 1;
+      } else {
+        _trackCount =
+            (constraints.maxHeight * _option.area / _danmakuHeight).floor();
+      }
 
       /// 为字幕留出余量
       if (_option.safeArea && _option.area == 1.0) {
         _trackCount = _trackCount - 1;
       }
+      if (_trackCount < 1) {
+        _trackCount = 1;
+      }
 
       _trackYPositions.clear();
       for (int i = 0; i < _trackCount; i++) {

lib/danmaku_canvas/lib/models/danmaku_option.dart

@@ -5,7 +5,7 @@ class DanmakuOption {
   /// 字体粗细
   final int fontWeight;
 
-  /// 显示区域，0.1-1.0
+  /// 显示区域：0.0=单行显示，(0.0, 1.0]=按比例
   final double area;
 
   /// 滚动弹幕运行时间，秒

lib/themes/nipaplay/widgets/danmaku_settings_menu.dart

@@ -29,6 +29,7 @@ class DanmakuSettingsMenu extends StatefulWidget {
 
 class _DanmakuSettingsMenuState extends State<DanmakuSettingsMenu> {
   static const List<double> _danmakuDisplayAreaOptions = <double>[
+    0.0, // 单行显示
     0.125, // 1/8
     0.25, // 1/4
     0.33, // 1/3
@@ -37,6 +38,7 @@ class _DanmakuSettingsMenuState extends State<DanmakuSettingsMenu> {
   ];
 
   static final Map<double, String> _danmakuDisplayAreaLabels = <double, String>{
+    0.0: '单行显示',
     0.125: '1/8 屏幕',
     0.25: '1/4 屏幕',
     0.33: '1/3 屏幕',

lib/utils/video_player_state.dart

@@ -292,7 +292,7 @@ class VideoPlayerState extends ChangeNotifier implements WindowListener {
   // 弹幕轨道显示区域设置
   final String _danmakuDisplayAreaKey = 'danmaku_display_area';
   double _danmakuDisplayArea =
-      1.0; // 默认全屏显示（1.0=全屏，0.67=2/3，0.33=1/3，0.25=1/4，0.125=1/8）
+      1.0; // 默认全屏显示（0.0=单行，1.0=全屏，0.67=2/3，0.33=1/3，0.25=1/4，0.125=1/8）
 
   // 弹幕速度设置
   final String _danmakuSpeedMultiplierKey = 'danmaku_speed_multiplier';

lib/widgets/danmaku_container.dart

@@ -286,6 +286,10 @@ class _DanmakuContainerState extends State<DanmakuContainer> {
     if (widget.fontSize != oldWidget.fontSize) {
       _invalidateLayoutCaches();
     }
+
+    if (widget.displayArea != oldWidget.displayArea) {
+      _invalidateLayoutCaches();
+    }
   }
 
   void _invalidateLayoutCaches() {