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Packages/com.unity.inputsystem/InputSystem/Editor/PropertyDrawers/InputActionDrawer.cs

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+#if UNITY_EDITOR
+using System;
+using UnityEditor;
+using UnityEditor.IMGUI.Controls;
+
+#if UNITY_6000_2_OR_NEWER
+using TreeViewItem = UnityEditor.IMGUI.Controls.TreeViewItem<int>;
+#endif
+
+namespace UnityEngine.InputSystem.Editor
+{
+    /// <summary>
+    /// Property drawer for <see cref="InputAction"/>.
+    /// </summary>
+    [CustomPropertyDrawer(typeof(InputAction))]
+    internal class InputActionDrawer : InputActionDrawerBase
+    {
+        protected override TreeViewItem BuildTree(SerializedProperty property)
+        {
+            return InputActionTreeView.BuildWithJustBindingsFromAction(property);
+        }
+
+        protected override string GetSuffixToRemoveFromPropertyDisplayName()
+        {
+            return " Action";
+        }
+
+        protected override bool IsPropertyAClone(SerializedProperty property)
+        {
+            // When a new item is added to a collection through the inspector, the default behaviour is
+            // to create a clone of the previous item. Here we look at all InputActions that appear before
+            // the current one and compare their Ids to determine if we have a clone. We don't look past
+            // the current item because Unity will be calling this property drawer for each input action
+            // in the collection in turn. If the user just added a new input action, and it's a clone, as
+            // we work our way down the list, we'd end up thinking that an existing input action was a clone
+            // of the newly added one, instead of the other way around. If we do have a clone, we need to
+            // clear out some properties of the InputAction (id, name, and singleton action bindings) and
+            // recreate the tree view.
+
+            if (property?.GetParentProperty() == null || property.GetParentProperty().isArray == false)
+                return false;
+
+            var array = property.GetArrayPropertyFromElement();
+            var index = property.GetIndexOfArrayElement();
+
+            for (var i = 0; i < index; i++)
+            {
+                if (property.FindPropertyRelative(nameof(InputAction.m_Id))?.stringValue ==
+                    array.GetArrayElementAtIndex(i)?.FindPropertyRelative(nameof(InputAction.m_Id))?.stringValue)
+                    return true;
+            }
+
+            return false;
+        }
+
+        protected override void ResetProperty(SerializedProperty property)
+        {
+            if (property == null) return;
+
+            property.SetStringValue(nameof(InputAction.m_Id), Guid.NewGuid().ToString());
+            property.SetStringValue(nameof(InputAction.m_Name), "Input Action");
+            property.FindPropertyRelative(nameof(InputAction.m_SingletonActionBindings))?.ClearArray();
+            property.serializedObject?.ApplyModifiedPropertiesWithoutUndo();
+        }
+    }
+}
+#endif // UNITY_EDITOR