Dynamic Input System Rebinding

Implemented live rebinding of Input System actions
Split composite actions into their component Buttons for rebinding

Assets/Scripts/UI/InputScreen/InputLayout.cs

@@ -0,0 +1,103 @@
+using System.Collections.Generic;
+using JsonKnownTypes;using MessagePack;
+using Newtonsoft.Json;
+
+[MessagePackObject, JsonObject(MemberSerialization.OptIn)]
+public class InputLayout
+{
+    [Key(0), JsonProperty("rows")] public InputLayoutRow[] Rows;
+
+    public IEnumerable<InputLayoutBindableKey> GetBindableKeys()
+    {
+        foreach (var row in Rows)
+        {
+            if (!(row is InputLayoutKeyRow keyRow)) continue;
+            
+            foreach (var column in keyRow.Columns)
+            {
+                if (column is InputLayoutBindableKey bindableKey)
+                {
+                    yield return bindableKey;
+                }
+            }
+        }
+    }
+}
+
+[JsonConverter(typeof(JsonKnownTypesConverter<InputLayoutRow>)),
+ MessagePackObject, 
+ Union(0, typeof(InputLayoutRowSpacer)),
+ Union(1, typeof(InputLayoutKeyRow))
+]
+public abstract class InputLayoutRow { }
+
+[MessagePackObject, JsonObject(MemberSerialization.OptIn)]
+public class InputLayoutRowSpacer : InputLayoutRow
+{
+    [Key(0), JsonProperty("height")] public float Height;
+}
+
+[MessagePackObject, JsonObject(MemberSerialization.OptIn)]
+public class InputLayoutKeyRow : InputLayoutRow
+{
+    [Key(0), JsonProperty("columns")] public InputLayoutColumn[] Columns;
+}
+
+[JsonConverter(typeof(JsonKnownTypesConverter<InputLayoutColumn>)),
+ MessagePackObject, 
+ Union(0, typeof(InputLayoutColumnSpacer)),
+ Union(1, typeof(InputLayoutKey)),
+ Union(2, typeof(InputLayoutBindableKey)),
+ Union(3, typeof(InputLayoutMultiRowKey))
+]
+public abstract class InputLayoutColumn
+{
+    [Key(0), JsonProperty("width")] public float Width;
+}
+
+[MessagePackObject, JsonObject(MemberSerialization.OptIn)]
+public class InputLayoutColumnSpacer : InputLayoutColumn { }
+
+[MessagePackObject, JsonObject(MemberSerialization.OptIn)]
+public class InputLayoutKey : InputLayoutColumn { }
+
+[MessagePackObject, JsonObject(MemberSerialization.OptIn)]
+public class InputLayoutBindableKey : InputLayoutKey, IBindableButton
+{
+    [Key(1), JsonProperty("mainLabel")] public string MainLabel;
+    [Key(2), JsonProperty("altLabel")] public string AltLabel;
+    [Key(3), JsonProperty("path")] public string ShortPath;
+
+    [IgnoreMember]
+    public string InputSystemPath
+    {
+        get
+        {
+            return $"<Keyboard>/{ShortPath}";
+        }
+        set
+        {
+            ShortPath = value.Substring(value.LastIndexOf('/') + 1);
+        }
+    }
+}
+
+public class InputLayoutMultiRowKey : InputLayoutBindableKey
+{
+    [Key(4), JsonProperty("height")] public int Height;
+}
+
+public class InputLayoutMouseButton : IBindableButton
+{
+    public string Path;
+    public string InputSystemPath
+    {
+        get => Path;
+        set => Path = value;
+    }
+}
+
+public interface IBindableButton
+{
+    public string InputSystemPath { get; set; }
+}