feat: 快进、快退、拖动时时间戳展示、关闭自动播放时处理、单p播放完成处理

lib/plugin/pl_player/models/duration.dart

@@ -0,0 +1,29 @@
+extension DurationExtension on Duration {
+  /// Returns clamp of [Duration] between [min] and [max].
+  Duration clamp(Duration min, Duration max) {
+    if (this < min) return min;
+    if (this > max) return max;
+    return this;
+  }
+
+  /// Returns a [String] representation of [Duration].
+  String label({Duration? reference}) {
+    reference ??= this;
+    if (reference > const Duration(days: 1)) {
+      final days = inDays.toString().padLeft(3, '0');
+      final hours = (inHours - (inDays * 24)).toString().padLeft(2, '0');
+      final minutes = (inMinutes - (inHours * 60)).toString().padLeft(2, '0');
+      final seconds = (inSeconds - (inMinutes * 60)).toString().padLeft(2, '0');
+      return '$days:$hours:$minutes:$seconds';
+    } else if (reference > const Duration(hours: 1)) {
+      final hours = inHours.toString().padLeft(2, '0');
+      final minutes = (inMinutes - (inHours * 60)).toString().padLeft(2, '0');
+      final seconds = (inSeconds - (inMinutes * 60)).toString().padLeft(2, '0');
+      return '$hours:$minutes:$seconds';
+    } else {
+      final minutes = inMinutes.toString().padLeft(2, '0');
+      final seconds = (inSeconds - (inMinutes * 60)).toString().padLeft(2, '0');
+      return '$minutes:$seconds';
+    }
+  }
+}