add music lyric preview

QuickLook.Plugin/QuickLook.Plugin.ImageViewer/ImagePanel.xaml.cs

@@ -176,8 +176,7 @@ public Visibility BackgroundVisibility
             }
         }
 
-        //comment by gh
-        /*
+
         public double MinZoomFactor
         {
             get => _minZoomFactor;
@@ -197,7 +196,7 @@ public double MaxZoomFactor
                 OnPropertyChanged();
             }
         }
-        */
+
 
         public double ZoomToFitFactor
         {

QuickLook.Plugin/QuickLook.Plugin.VideoViewer/Converters.cs

@@ -29,7 +29,7 @@ public object Convert(object value, Type targetType, object parameter, CultureIn
             if (value == null)
                 return "00:00";
 
-            var v = TimeSpan.FromTicks((long) value);
+            var v = TimeSpan.FromTicks((long)value);
 
             var s = string.Empty;
             if (v.Hours > 0)
@@ -48,20 +48,20 @@ object IValueConverter.ConvertBack(object value, Type targetType, object paramet
 
     public sealed class VolumeToIconConverter : DependencyObject, IValueConverter
     {
-        private static readonly string[] Volumes = {"\xE74F", "\xE993", "\xE994", "\xE995"};
+        private static readonly string[] Volumes = { "\xE74F", "\xE993", "\xE994", "\xE995" };
 
         public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
         {
             if (value == null)
                 return Volumes[0];
 
-            var v = (double) value;
+            var v = (double)value;
             if (Math.Abs(v) < 0.01)
                 return Volumes[0];
 
             v = Math.Min(v, 1);
 
-            return Volumes[1 + (int) (v / 0.34)];
+            return Volumes[1 + (int)(v / 0.34)];
         }
 
         public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)

QuickLook.Plugin/QuickLook.Plugin.VideoViewer/Lyric/LrcLine.cs

@@ -0,0 +1,137 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace QuickLook.Plugin.VideoViewer.Lyric
+{
+    public class LrcLine
+    {
+        // https://en.wikipedia.org/wiki/LRC_(file_format)
+
+        public TimeSpan? LrcTime { get; set; }
+
+
+        public string LrcText { get; set; }
+
+        public LrcLine(double time, string text)
+        {
+            LrcTime = new TimeSpan(0, 0, 0, 0, ((int)(time * 1000) + LrcManager.offset) < 0 ? 0 : ((int)(time * 1000) + LrcManager.offset));
+            LrcText = text;
+        }
+        public LrcLine(TimeSpan? time, string text)
+        {
+            if (time.HasValue)
+            {
+                LrcTime = time + new TimeSpan(0, 0, 0, 0, LrcManager.offset);
+                if (TimeSpan.Compare(LrcTime.Value, TimeSpan.Zero) < 0)
+                {
+                    LrcTime = TimeSpan.Zero;
+                }
+            }
+            LrcText = text;
+        }
+        public LrcLine(TimeSpan? time)
+            : this(time, string.Empty)
+        {
+
+        }
+        public LrcLine(LrcLine lrcLine)
+            : this(lrcLine.LrcTime, lrcLine.LrcText)
+        {
+            //LrcTime = lrcLine.LrcTime;
+            //LrcText = lrcLine.LrcText;
+        }
+        public LrcLine(string line)
+            : this(Parse(line))
+        {
+
+        }
+        public LrcLine()
+        {
+            LrcTime = null;
+            LrcText = string.Empty;
+        }
+
+        public static LrcLine Parse(string line)
+        {
+            // 歌曲信息|[al:album]      | Time = null, Content = Info
+            // 空白行  |                | Time = null, Content = empty
+            // 正常歌词|[00:00.000]Info | Time = time, Content = content
+            // 空白歌词|[00:00.000]     | Time = time, Content = empty
+            // 多行歌词|[00:00.000][00:01.000]Info
+
+            // 判断是否为空白行
+            if (string.IsNullOrWhiteSpace(line))
+            {
+                return Empty;
+            }
+            // 这里不考虑多行歌词的情况
+            if (CheckMultiLine(line)) throw new FormatException();
+
+            // 此时只能为正常歌词
+            var slices = line.TrimStart().TrimStart('[').Split(']');
+            if (slices.Length != 2) throw new FormatException();
+
+            // 如果方括号中的内容无法转化为时间，则认为是歌曲信息
+            if (!TryParseTimeSpan(slices[0], out TimeSpan time))
+            {
+                return new LrcLine(null, slices[0]);
+            }
+
+            // 正常歌词和空白歌词不需要进行额外区分
+            return new LrcLine(time, slices[1]);
+
+        }
+
+        static public bool TryParseTimeSpan(string s, out TimeSpan t)
+        {
+            try
+            {
+                t = TimeSpan.Parse("00:" + s); ;
+                return true;
+            }
+            catch
+            {
+                t = TimeSpan.Zero;
+                return false;
+            }
+        }
+
+        public static bool TryParse(string line, out LrcLine lrcLine)
+        {
+            try
+            {
+                lrcLine = Parse(line);
+                return true;
+            }
+            catch
+            {
+                lrcLine = Empty;
+                return false;
+            }
+        }
+
+        public static readonly LrcLine Empty = new LrcLine();
+
+        /// <summary>
+        /// 判断是否为多行歌词
+        /// </summary>
+        public static bool CheckMultiLine(string line)
+        {
+            // 指的是从左侧第二个字符开始找，如果仍然能够找到“[”，则认为包含超过一个时间框
+            if (line.TrimStart().IndexOf('[', 1) != -1) return true;
+            else return false;
+        }
+
+        public int CompareTo(LrcLine other)
+        {
+            // 保证歌曲信息永远在最开头
+            if (!LrcTime.HasValue) return -1;
+            if (!other.LrcTime.HasValue) return 1;
+            // 正常的歌词按照时间顺序进行排列
+            return LrcTime.Value.CompareTo(other.LrcTime.Value);
+        }
+    }
+}