Add custom editor for buttons that allow listening for them inside the editor.

Source/Editor/CustomEditors/Editors/GamepadButtonEditor.cs

@@ -0,0 +1,51 @@
+using System;
+using FlaxEngine;
+
+namespace FlaxEditor.CustomEditors.Editors
+{
+    /// <summary>
+    /// Custom editor for <see cref="GamepadButton"/>.
+    /// Allows capturing gamepad buttons and assigning them
+    /// to the edited value.
+    /// </summary>
+    [CustomEditor(typeof(GamepadButton))]
+    public class GamepadButtonEditor : BindableButtonEditor
+    {
+        /// <inheritdoc />
+        public override void Initialize(LayoutElementsContainer layout)
+        {
+            base.Initialize(layout);
+            FlaxEngine.Scripting.Update += ScriptingOnUpdate;
+        }
+
+        /// <inheritdoc />
+        protected override void Deinitialize()
+        {
+            FlaxEngine.Scripting.Update -= ScriptingOnUpdate;
+            base.Deinitialize();
+        }
+
+        private void ScriptingOnUpdate()
+        {
+            if (!IsListeningForInput)
+                return;
+
+            // Since there is no way to get an event about
+            // which gamepad pressed what button, we have
+            // to poll all gamepads and buttons manually.
+            for (var i = 0; i < Input.GamepadsCount; i++)
+            {
+                var pad = Input.Gamepads[i];
+                foreach (var btn in Enum.GetValues<GamepadButton>())
+                {
+                    if (pad.GetButtonUp(btn))
+                    {
+                        IsListeningForInput = false;
+                        SetValue(btn);
+                        return;
+                    }
+                }
+            }
+        }
+    }
+}