Add user rating editing to grid

Source/LibationWinForms/GridView/MyRatingGridViewColumn.cs

@@ -0,0 +1,73 @@
+using DataLayer;
+using System;
+using System.ComponentModel;
+using System.Linq;
+using System.Windows.Forms;
+
+namespace LibationWinForms.GridView
+{
+	public class MyRatingGridViewColumn : DataGridViewColumn
+	{
+		public MyRatingGridViewColumn() : base(new MyRatingGridViewCell()) { }
+
+		public override DataGridViewCell CellTemplate
+		{
+			get => base.CellTemplate;
+			set
+			{
+				if (value is not MyRatingGridViewCell)
+					throw new InvalidCastException("Must be a MyRatingGridViewCell");
+
+				base.CellTemplate = value;
+			}
+		}
+	}
+
+	internal class MyRatingGridViewCell : DataGridViewTextBoxCell
+	{
+		public override void InitializeEditingControl(int rowIndex, object initialFormattedValue, DataGridViewCellStyle dataGridViewCellStyle)
+		{
+			base.InitializeEditingControl(rowIndex, initialFormattedValue, dataGridViewCellStyle);
+
+			var ctl = DataGridView.EditingControl as RatingPicker;
+
+			ctl.Rating =
+				Value is Rating rating
+				? rating
+				: (Rating)DefaultNewRowValue;
+		}
+
+		public override object ParseFormattedValue(object formattedValue, DataGridViewCellStyle cellStyle, TypeConverter formattedValueTypeConverter, TypeConverter valueTypeConverter)
+		{
+			const char SOLID_STAR = '★';
+			if (formattedValue is string s)
+			{
+				int overall = 0, performance = 0, story = 0;
+
+				foreach (var line in s.Split('\n'))
+				{
+					if (line.Contains("Overall"))
+						overall = line.Count(c => c == SOLID_STAR);
+					else if (line.Contains("Perform"))
+						performance = line.Count(c => c == SOLID_STAR);
+					else if (line.Contains("Story"))
+						story = line.Count(c => c == SOLID_STAR);
+				}
+
+				return new Rating(overall, performance, story);
+			}
+			else
+				return DefaultNewRowValue;
+		}
+
+
+		protected override object GetFormattedValue(object value, int rowIndex, ref DataGridViewCellStyle cellStyle, TypeConverter valueTypeConverter, TypeConverter formattedValueTypeConverter, DataGridViewDataErrorContexts context)
+			=> value is Rating rating
+				? rating.ToStarString()
+				: base.GetFormattedValue(value, rowIndex, ref cellStyle, valueTypeConverter, formattedValueTypeConverter, context);
+
+		public override Type EditType => typeof(RatingPicker);
+		public override object DefaultNewRowValue => new Rating(0, 0, 0);
+		public override Type ValueType => typeof(Rating);
+	}
+}