Palette picks a whole object on a click; mod documentation

src/RpgAppearanceCatalog.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using Cthangover.Core.Mods;
+using Cthangover.Core.Mods.Resolvers;
+using Cthangover.Mods.Rpg;
+
+namespace Cthangover.Tools.RpgEditor
+{
+    /// <summary>
+    /// All map charsets supplied by the loaded mods, including NPC artwork without
+    /// a character entity. Paths stay distinct even when two mods use the same file name.
+    /// These entries describe appearance only and must never be used as battle enemy ids.
+    /// </summary>
+    public static class RpgAppearanceCatalog
+    {
+        /// <summary>Reads charset images anew and builds standing-frame previews for the picker.</summary>
+        public static List<RpgPickerEntry> Load(RpgTextures textures)
+        {
+            var files = Files.Collect(RpgTextures.CharsetGroup);
+            return (files?.Keys.AsEnumerable() ?? Enumerable.Empty<string>())
+                .Where(IsImage)
+                .Select(file => Path.ChangeExtension(file, null))
+                .Distinct(StringComparer.OrdinalIgnoreCase)
+                .OrderBy(path => path, StringComparer.OrdinalIgnoreCase)
+                .Select(path => new RpgPickerEntry
+                {
+                    Id = path,
+                    Name = Path.GetFileName(path),
+                    Look = path,
+                    Icon = RpgCharacterCatalog.FrontFrame(textures.Charset(path)),
+                    OwnsIcon = true
+                })
+                .ToList();
+        }
+
+        private static bool IsImage(string path)
+            => ModConfig.Instance.GetTextureExtensionSet().Contains(Path.GetExtension(path));
+    }
+}