test

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Editor/AssetEditor/InputActionAssetManager.cs

@@ -0,0 +1,249 @@
+#if UNITY_EDITOR
+using System;
+using System.Diagnostics.CodeAnalysis;
+using System.IO;
+using UnityEditor;
+
+////TODO: ensure that GUIDs in the asset are unique
+
+namespace UnityEngine.InputSystem.Editor
+{
+    /// <summary>
+    /// Keeps a reference to the asset being edited and maintains a copy of the asset object
+    /// around for editing.
+    /// </summary>
+    [Serializable]
+    internal class InputActionAssetManager : IDisposable
+    {
+        [SerializeField] private InputActionAsset m_AssetObjectForEditing;
+        [SerializeField] private InputActionAsset m_ImportedAssetObject;
+        [SerializeField] private string m_AssetGUID;
+        [SerializeField] private string m_ImportedAssetJson;
+        [SerializeField] private bool m_IsDirty;
+
+        private SerializedObject m_SerializedObject;
+
+        /// <summary>
+        /// Returns the Asset GUID uniquely identifying the associated imported asset.
+        /// </summary>
+        public string guid => m_AssetGUID;
+
+        /// <summary>
+        /// Returns the current Asset Path for the associated imported asset.
+        /// If the asset have been deleted this will be <c>null</c>.
+        /// </summary>
+        public string path
+        {
+            get
+            {
+                Debug.Assert(!string.IsNullOrEmpty(m_AssetGUID), "Asset GUID is empty");
+                return AssetDatabase.GUIDToAssetPath(m_AssetGUID);
+            }
+        }
+
+        /// <summary>
+        /// Returns the name of the associated imported asset.
+        /// </summary>
+        public string name
+        {
+            get
+            {
+                var asset = importedAsset;
+                if (asset != null)
+                    return asset.name;
+
+                if (!string.IsNullOrEmpty(path))
+                    return Path.GetFileNameWithoutExtension(path);
+
+                return string.Empty;
+            }
+        }
+
+        private InputActionAsset importedAsset
+        {
+            get
+            {
+                // Note that this may be null after deserialization from domain reload
+                if (m_ImportedAssetObject == null)
+                    LoadImportedObjectFromGuid();
+
+                return m_ImportedAssetObject;
+            }
+        }
+
+        public InputActionAsset editedAsset => m_AssetObjectForEditing; // TODO Remove if redundant
+
+        public Action<bool> onDirtyChanged { get; set; }
+
+        public InputActionAssetManager(InputActionAsset inputActionAsset)
+        {
+            if (inputActionAsset == null)
+                throw new NullReferenceException(nameof(inputActionAsset));
+            m_AssetGUID = EditorHelpers.GetAssetGUID(inputActionAsset);
+            if (m_AssetGUID == null)
+                throw new Exception($"Failed to get asset {inputActionAsset.name} GUID");
+
+            m_ImportedAssetObject = inputActionAsset;
+
+            Initialize();
+        }
+
+        public SerializedObject serializedObject => m_SerializedObject;
+
+        public bool dirty => m_IsDirty;
+
+        public bool Initialize()
+        {
+            if (m_AssetObjectForEditing == null)
+            {
+                if (importedAsset == null)
+                {
+                    // The asset we want to edit no longer exists.
+                    return false;
+                }
+
+                CreateWorkingCopyAsset();
+            }
+            else
+            {
+                m_SerializedObject = new SerializedObject(m_AssetObjectForEditing);
+            }
+
+            return true;
+        }
+
+        public void Dispose()
+        {
+            if (m_SerializedObject == null)
+                return;
+            m_SerializedObject?.Dispose();
+            m_SerializedObject = null;
+        }
+
+        public bool ReInitializeIfAssetHasChanged()
+        {
+            var json = importedAsset.ToJson();
+            if (m_ImportedAssetJson == json)
+                return false;
+
+            CreateWorkingCopyAsset();
+            return true;
+        }
+
+        public static InputActionAsset CreateWorkingCopy(InputActionAsset source)
+        {
+            var copy = Object.Instantiate(source);
+            copy.hideFlags = HideFlags.HideAndDontSave;
+            copy.name = source.name;
+            return copy;
+        }
+
+        public static void CreateWorkingCopyAsset(ref InputActionAsset copy, InputActionAsset source)
+        {
+            if (copy != null)
+                Cleanup(ref copy);
+
+            copy = CreateWorkingCopy(source);
+        }
+
+        private void CreateWorkingCopyAsset() // TODO Can likely be removed if combined with Initialize
+        {
+            if (m_AssetObjectForEditing != null)
+                Cleanup();
+
+            // Duplicate the asset along 1:1. Unlike calling Clone(), this will also preserve GUIDs.
+            var asset = importedAsset;
+            m_AssetObjectForEditing = CreateWorkingCopy(asset);
+            m_ImportedAssetJson = asset.ToJson();
+            m_SerializedObject = new SerializedObject(m_AssetObjectForEditing);
+        }
+
+        public void Cleanup()
+        {
+            Cleanup(ref m_AssetObjectForEditing);
+        }
+
+        public static void Cleanup(ref InputActionAsset asset)
+        {
+            if (asset == null)
+                return;
+
+            Object.DestroyImmediate(asset);
+            asset = null;
+        }
+
+        private void LoadImportedObjectFromGuid()
+        {
+            // https://fogbugz.unity3d.com/f/cases/1313185/
+            // InputActionEditorWindow being an EditorWindow, it will be saved as part of the editor's
+            // window layout. When a project is opened that has no Library/ folder, the layout from the
+            // most recently opened project is used. Which means that when opening an .inputactions
+            // asset in project A, then closing it, and then opening project B, restoring the window layout
+            // also tries to restore the InputActionEditorWindow having that very same asset open -- which
+            // will lead nowhere except there happens to be an InputActionAsset with the very same GUID in
+            // the project.
+            var assetPath = path;
+            if (!string.IsNullOrEmpty(assetPath))
+                m_ImportedAssetObject = AssetDatabase.LoadAssetAtPath<InputActionAsset>(assetPath);
+        }
+
+        public void ApplyChanges()
+        {
+            m_SerializedObject.ApplyModifiedProperties();
+            m_SerializedObject.Update();
+        }
+
+        internal void SaveChangesToAsset()
+        {
+            // If this is invoked after a domain reload, importAsset will resolve itself.
+            // However, if the asset do not exist importedAsset will be null and we cannot complete the operation.
+            if (importedAsset == null)
+                throw new Exception("Unable to save changes. Associated asset does not exist.");
+
+            SaveAsset(path, m_AssetObjectForEditing.ToJson());
+            SetDirty(false);
+        }
+
+        /// <summary>
+        /// Saves an asset to the given <c>assetPath</c> with file content corresponding to <c>assetJson</c>
+        /// if the current content of the asset given by <c>assetPath</c> is different or the asset do not exist.
+        /// </summary>
+        /// <param name="assetPath">Destination asset path.</param>
+        /// <param name="assetJson">The JSON file content to be written to the asset.</param>
+        /// <returns><c>true</c> if the asset was successfully modified or created, else <c>false</c>.</returns>
+        internal static bool SaveAsset(string assetPath, string assetJson)
+        {
+            var existingJson = File.Exists(assetPath) ? File.ReadAllText(assetPath) : string.Empty;
+
+            // Return immediately if file content has not changed, i.e. touching the file would not yield a difference.
+            if (assetJson == existingJson)
+                return false;
+
+            // Attempt to write asset to disc (including checkout the file) and inform the user if this fails.
+            if (EditorHelpers.WriteAsset(assetPath, assetJson))
+                return true;
+
+            Debug.LogError($"Unable save asset to \"{assetPath}\" since the asset-path could not be checked-out as editable in the underlying version-control system.");
+            return false;
+        }
+
+        public void MarkDirty()
+        {
+            SetDirty(true);
+        }
+
+        public void UpdateAssetDirtyState()
+        {
+            m_SerializedObject.Update();
+            SetDirty(m_AssetObjectForEditing.ToJson() != importedAsset.ToJson()); // TODO Why not using cached version?
+        }
+
+        private void SetDirty(bool newValue)
+        {
+            m_IsDirty = newValue;
+            if (onDirtyChanged != null)
+                onDirtyChanged(newValue);
+        }
+    }
+}
+#endif // UNITY_EDITOR

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Editor/AssetEditor/InputActionAssetManager.cs.meta

@@ -0,0 +1,11 @@
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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Editor/AssetEditor/InputActionEditorToolbar.cs.meta

@@ -0,0 +1,11 @@
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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Editor/AssetEditor/InputActionEditorWindow.cs.meta

@@ -0,0 +1,11 @@
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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Editor/AssetEditor/InputActionPropertiesView.cs

@@ -0,0 +1,130 @@
+#if UNITY_EDITOR
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using UnityEditor;
+using UnityEngine.InputSystem.Controls;
+using UnityEngine.InputSystem.Utilities;
+
+namespace UnityEngine.InputSystem.Editor
+{
+    /// <summary>
+    /// UI that edits the properties of an <see cref="InputAction"/>.
+    /// </summary>
+    /// <remarks>
+    /// Right-most pane in <see cref="InputActionEditorWindow"/> when an action is selected.
+    /// </remarks>
+    internal class InputActionPropertiesView : PropertiesViewBase
+    {
+        public static FourCC k_PropertiesChanged => new FourCC("PROP");
+
+        public InputActionPropertiesView(SerializedProperty actionProperty, Action<FourCC> onChange = null)
+            : base("Action", actionProperty, onChange, actionProperty.FindPropertyRelative("m_ExpectedControlType").stringValue)
+        {
+            m_ExpectedControlTypeProperty = actionProperty.FindPropertyRelative(nameof(InputAction.m_ExpectedControlType));
+            m_ActionTypeProperty = actionProperty.FindPropertyRelative(nameof(InputAction.m_Type));
+            m_ActionFlagsProperty = actionProperty.FindPropertyRelative(nameof(InputAction.m_Flags));
+
+            m_SelectedActionType = (InputActionType)m_ActionTypeProperty.intValue;
+            m_WantsInitialStateCheck = (m_ActionFlagsProperty.intValue & (int)InputAction.ActionFlags.WantsInitialStateCheck) != 0;
+
+            BuildControlTypeList();
+            m_SelectedControlType = Array.IndexOf(m_ControlTypeList, m_ExpectedControlTypeProperty.stringValue);
+            if (m_SelectedControlType == -1)
+                m_SelectedControlType = 0;
+
+            if (s_ControlTypeLabel == null)
+                s_ControlTypeLabel = EditorGUIUtility.TrTextContent("Control Type", m_ExpectedControlTypeProperty.GetTooltip());
+            if (s_ActionTypeLabel == null)
+                s_ActionTypeLabel = EditorGUIUtility.TrTextContent("Action Type", m_ActionTypeProperty.GetTooltip());
+            if (s_WantsInitialStateCheckLabel == null)
+                s_WantsInitialStateCheckLabel = EditorGUIUtility.TrTextContent("Initial State Check",
+                    "Whether in the next input update after the action was enabled, the action should "
+                    + "immediately trigger if any of its bound controls are currently in a non-default state. "
+                    + "This check happens implicitly for Value actions but can be explicitly enabled for Button and Pass-Through actions.");
+        }
+
+        protected override void DrawGeneralProperties()
+        {
+            EditorGUI.BeginChangeCheck();
+
+            m_SelectedActionType = EditorGUILayout.EnumPopup(s_ActionTypeLabel, m_SelectedActionType);
+            if ((InputActionType)m_SelectedActionType != InputActionType.Button)
+                m_SelectedControlType = EditorGUILayout.Popup(s_ControlTypeLabel, m_SelectedControlType, m_ControlTypeOptions);
+
+            if ((InputActionType)m_SelectedActionType != InputActionType.Value)
+                m_WantsInitialStateCheck = EditorGUILayout.Toggle(s_WantsInitialStateCheckLabel, m_WantsInitialStateCheck);
+
+            if (EditorGUI.EndChangeCheck())
+            {
+                if ((InputActionType)m_SelectedActionType == InputActionType.Button)
+                    m_ExpectedControlTypeProperty.stringValue = "Button";
+                else if (m_SelectedControlType == 0)
+                    m_ExpectedControlTypeProperty.stringValue = string.Empty;
+                else
+                    m_ExpectedControlTypeProperty.stringValue = m_ControlTypeList[m_SelectedControlType];
+
+                m_ActionTypeProperty.intValue = (int)(InputActionType)m_SelectedActionType;
+
+                if (m_WantsInitialStateCheck)
+                    m_ActionFlagsProperty.intValue |= (int)InputAction.ActionFlags.WantsInitialStateCheck;
+                else
+                    m_ActionFlagsProperty.intValue &= ~(int)InputAction.ActionFlags.WantsInitialStateCheck;
+
+                m_ActionTypeProperty.serializedObject.ApplyModifiedProperties();
+                UpdateProcessors(m_ExpectedControlTypeProperty.stringValue);
+
+                onChange(k_PropertiesChanged);
+            }
+        }
+
+        private void BuildControlTypeList()
+        {
+            var types = new List<string>();
+            var allLayouts = InputSystem.s_Manager.m_Layouts;
+            foreach (var layoutName in allLayouts.layoutTypes.Keys)
+            {
+                if (EditorInputControlLayoutCache.TryGetLayout(layoutName).hideInUI)
+                    continue;
+
+                // If the action type is InputActionType.Value, skip button controls.
+                var type = allLayouts.layoutTypes[layoutName];
+                if ((InputActionType)m_SelectedActionType == InputActionType.Value &&
+                    typeof(ButtonControl).IsAssignableFrom(type))
+                    continue;
+
+                ////TODO: skip aliases
+
+                if (typeof(InputControl).IsAssignableFrom(type) &&
+                    !typeof(InputDevice).IsAssignableFrom(type))
+                {
+                    types.Add(layoutName);
+                }
+            }
+            // Sort alphabetically.
+            types.Sort((a, b) => string.Compare(a, b, StringComparison.OrdinalIgnoreCase));
+            // Make sure "Any" is always topmost entry.
+            types.Insert(0, "Any");
+
+            m_ControlTypeList = types.ToArray();
+            m_ControlTypeOptions = m_ControlTypeList.Select(x => new GUIContent(ObjectNames.NicifyVariableName(x)))
+                .ToArray();
+        }
+
+        private readonly SerializedProperty m_ExpectedControlTypeProperty;
+        private readonly SerializedProperty m_ActionTypeProperty;
+        private readonly SerializedProperty m_ActionFlagsProperty;
+
+        private string m_ExpectedControlLayout;
+        private string[] m_ControlTypeList;
+        private GUIContent[] m_ControlTypeOptions;
+        private int m_SelectedControlType;
+        private Enum m_SelectedActionType;
+        private bool m_WantsInitialStateCheck;
+
+        private static GUIContent s_ActionTypeLabel;
+        private static GUIContent s_ControlTypeLabel;
+        private static GUIContent s_WantsInitialStateCheckLabel;
+    }
+}
+#endif // UNITY_EDITOR

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Editor/AssetEditor/InputActionPropertiesView.cs.meta

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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Editor/AssetEditor/InputActionTreeView.cs.meta

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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Editor/AssetEditor/InputActionTreeViewItems.cs.meta

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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Editor/AssetEditor/InputBindingPropertiesView.cs

@@ -0,0 +1,393 @@
+#if UNITY_EDITOR
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using UnityEditor;
+using UnityEngine.InputSystem.Editor.Lists;
+using UnityEngine.InputSystem.Layouts;
+using UnityEngine.InputSystem.Utilities;
+
+////REVIEW: when we start with a blank tree view state, we should initialize the control picker to select the control currently
+////        selected by the path property
+
+namespace UnityEngine.InputSystem.Editor
+{
+    /// <summary>
+    /// UI for editing properties of an <see cref="InputBinding"/>. Right-most pane in action editor when
+    /// binding is selected in middle pane.
+    /// </summary>
+    internal class InputBindingPropertiesView : PropertiesViewBase, IDisposable
+    {
+        public static FourCC k_GroupsChanged => new FourCC("GRPS");
+        public static FourCC k_PathChanged => new FourCC("PATH");
+        public static FourCC k_CompositeTypeChanged => new FourCC("COMP");
+        public static FourCC k_CompositePartAssignmentChanged => new FourCC("PART");
+
+        public InputBindingPropertiesView(
+            SerializedProperty bindingProperty,
+            Action<FourCC> onChange = null,
+            InputControlPickerState controlPickerState = null,
+            string expectedControlLayout = null,
+            ReadOnlyArray<InputControlScheme> controlSchemes = new ReadOnlyArray<InputControlScheme>(),
+            IEnumerable<string> controlPathsToMatch = null)
+            : base(InputActionSerializationHelpers.IsCompositeBinding(bindingProperty) ? "Composite" : "Binding",
+                   bindingProperty, onChange, expectedControlLayout)
+        {
+            m_BindingProperty = bindingProperty;
+            m_GroupsProperty = bindingProperty.FindPropertyRelative("m_Groups");
+            m_PathProperty = bindingProperty.FindPropertyRelative("m_Path");
+            m_BindingGroups = m_GroupsProperty.stringValue
+                .Split(new[] {InputBinding.Separator}, StringSplitOptions.RemoveEmptyEntries).ToList();
+            m_ExpectedControlLayout = expectedControlLayout;
+            m_ControlSchemes = controlSchemes;
+
+            var flags = (InputBinding.Flags)bindingProperty.FindPropertyRelative("m_Flags").intValue;
+            m_IsPartOfComposite = (flags & InputBinding.Flags.PartOfComposite) != 0;
+            m_IsComposite = (flags & InputBinding.Flags.Composite) != 0;
+
+            // Set up control picker for m_Path. Not needed if the binding is a composite.
+            if (!m_IsComposite)
+            {
+                m_ControlPickerState = controlPickerState ?? new InputControlPickerState();
+                m_ControlPathEditor = new InputControlPathEditor(m_PathProperty, m_ControlPickerState, OnPathChanged);
+                m_ControlPathEditor.SetExpectedControlLayout(m_ExpectedControlLayout);
+                if (controlPathsToMatch != null)
+                    m_ControlPathEditor.SetControlPathsToMatch(controlPathsToMatch);
+            }
+        }
+
+        public void Dispose()
+        {
+            m_ControlPathEditor?.Dispose();
+        }
+
+        protected override void DrawGeneralProperties()
+        {
+            var currentPath = m_PathProperty.stringValue;
+            InputSystem.OnDrawCustomWarningForBindingPath(currentPath);
+
+            if (m_IsComposite)
+            {
+                if (m_CompositeParameters == null)
+                    InitializeCompositeProperties();
+
+                // Composite type dropdown.
+                var selectedCompositeType = EditorGUILayout.Popup(s_CompositeTypeLabel, m_SelectedCompositeType, m_CompositeTypeOptions);
+                if (selectedCompositeType != m_SelectedCompositeType)
+                {
+                    m_SelectedCompositeType = selectedCompositeType;
+                    OnCompositeTypeChanged();
+                }
+
+                // Composite parameters.
+                m_CompositeParameters.OnGUI();
+            }
+            else
+            {
+                // Path.
+                m_ControlPathEditor.OnGUI();
+
+                // Composite part.
+                if (m_IsPartOfComposite)
+                {
+                    if (m_CompositeParts == null)
+                        InitializeCompositePartProperties();
+
+                    var selectedPart = EditorGUILayout.Popup(s_CompositePartAssignmentLabel, m_SelectedCompositePart,
+                        m_CompositePartOptions);
+                    if (selectedPart != m_SelectedCompositePart)
+                    {
+                        m_SelectedCompositePart = selectedPart;
+                        OnCompositePartAssignmentChanged();
+                    }
+                }
+
+                // Show the specific controls which match the current path
+                DrawMatchingControlPaths();
+
+                // Control scheme matrix.
+                DrawUseInControlSchemes();
+            }
+        }
+
+        /// <summary>
+        /// Used to keep track of which foldouts are expanded.
+        /// </summary>
+        private static bool showMatchingLayouts = false;
+        private static Dictionary<string, bool> showMatchingChildLayouts = new Dictionary<string, bool>();
+
+        private static void DrawMatchingControlPaths(List<MatchingControlPath> matchingControlPaths)
+        {
+            foreach (var matchingControlPath in matchingControlPaths)
+            {
+                bool showLayout = false;
+                EditorGUI.indentLevel++;
+
+                var text = $"{matchingControlPath.deviceName} > {matchingControlPath.controlName}";
+                if (matchingControlPath.children.Count() > 0 && !matchingControlPath.isRoot)
+                {
+                    showMatchingChildLayouts.TryGetValue(matchingControlPath.deviceName, out showLayout);
+                    showMatchingChildLayouts[matchingControlPath.deviceName] = EditorGUILayout.Foldout(showLayout, text);
+                }
+                else
+                {
+                    EditorGUILayout.LabelField(text);
+                }
+
+                showLayout |= matchingControlPath.isRoot;
+                if (showLayout)
+                    DrawMatchingControlPaths(matchingControlPath.children);
+
+                EditorGUI.indentLevel--;
+            }
+        }
+
+        /// <summary>
+        /// Finds all registered control paths implemented by concrete classes which match the current binding path and renders it.
+        /// </summary>
+        private void DrawMatchingControlPaths()
+        {
+            bool controlPathUsagePresent = false;
+            List<MatchingControlPath> matchingControlPaths = MatchingControlPath.CollectMatchingControlPaths(m_ControlPathEditor.pathProperty.stringValue, showMatchingLayouts, ref controlPathUsagePresent);
+            if (matchingControlPaths == null || matchingControlPaths.Count != 0)
+            {
+                EditorGUILayout.BeginVertical();
+                showMatchingLayouts = EditorGUILayout.Foldout(showMatchingLayouts, "Derived Bindings");
+
+                if (showMatchingLayouts)
+                {
+                    if (matchingControlPaths == null)
+                    {
+                        if (controlPathUsagePresent)
+                            EditorGUILayout.HelpBox("No registered controls match this current binding. Some controls are only registered at runtime.", MessageType.Warning);
+                        else
+                            EditorGUILayout.HelpBox("No other registered controls match this current binding. Some controls are only registered at runtime.", MessageType.Warning);
+                    }
+                    else
+                    {
+                        DrawMatchingControlPaths(matchingControlPaths);
+                    }
+                }
+
+                EditorGUILayout.EndVertical();
+            }
+        }
+
+        /// <summary>
+        /// Draw control scheme matrix that allows selecting which control schemes a particular
+        /// binding appears in.
+        /// </summary>
+        private void DrawUseInControlSchemes()
+        {
+            if (m_ControlSchemes.Count <= 0)
+                return;
+
+            EditorGUILayout.Space();
+            EditorGUILayout.Space();
+            EditorGUILayout.LabelField(s_UseInControlSchemesLAbel, EditorStyles.boldLabel);
+            EditorGUILayout.BeginVertical();
+
+            foreach (var scheme in m_ControlSchemes)
+            {
+                EditorGUI.BeginChangeCheck();
+                var result = EditorGUILayout.Toggle(scheme.name, m_BindingGroups.Contains(scheme.bindingGroup));
+                if (EditorGUI.EndChangeCheck())
+                {
+                    if (result)
+                    {
+                        m_BindingGroups.Add(scheme.bindingGroup);
+                    }
+                    else
+                    {
+                        m_BindingGroups.Remove(scheme.bindingGroup);
+                    }
+                    OnBindingGroupsChanged();
+                }
+            }
+
+            EditorGUILayout.EndVertical();
+        }
+
+        private void InitializeCompositeProperties()
+        {
+            // Find name of current composite.
+            var path = m_PathProperty.stringValue;
+            var compositeNameAndParameters = NameAndParameters.Parse(path);
+            var compositeName = compositeNameAndParameters.name;
+            var compositeType = InputBindingComposite.s_Composites.LookupTypeRegistration(compositeName);
+
+            // Collect all possible composite types.
+            var selectedCompositeIndex = -1;
+            var compositeTypeOptionsList = new List<GUIContent>();
+            var compositeTypeList = new List<string>();
+            var currentIndex = 0;
+            foreach (var composite in InputBindingComposite.s_Composites.internedNames.Where(x =>
+                !InputBindingComposite.s_Composites.aliases.Contains(x)).OrderBy(x => x))
+            {
+                if (!string.IsNullOrEmpty(m_ExpectedControlLayout))
+                {
+                    var valueType = InputBindingComposite.GetValueType(composite);
+                    if (valueType != null &&
+                        !InputControlLayout.s_Layouts.ValueTypeIsAssignableFrom(
+                            new InternedString(m_ExpectedControlLayout), valueType))
+                        continue;
+                }
+
+                if (InputBindingComposite.s_Composites.LookupTypeRegistration(composite) == compositeType)
+                    selectedCompositeIndex = currentIndex;
+                var name = ObjectNames.NicifyVariableName(composite);
+                compositeTypeOptionsList.Add(new GUIContent(name));
+                compositeTypeList.Add(composite);
+                ++currentIndex;
+            }
+
+            // If the current composite type isn't a registered type, add it to the list as
+            // an extra option.
+            if (selectedCompositeIndex == -1)
+            {
+                selectedCompositeIndex = compositeTypeList.Count;
+                compositeTypeOptionsList.Add(new GUIContent(ObjectNames.NicifyVariableName(compositeName)));
+                compositeTypeList.Add(compositeName);
+            }
+
+            m_CompositeTypes = compositeTypeList.ToArray();
+            m_CompositeTypeOptions = compositeTypeOptionsList.ToArray();
+            m_SelectedCompositeType = selectedCompositeIndex;
+
+            // Initialize parameters.
+            m_CompositeParameters = new ParameterListView
+            {
+                onChange = OnCompositeParametersModified
+            };
+            if (compositeType != null)
+                m_CompositeParameters.Initialize(compositeType, compositeNameAndParameters.parameters);
+        }
+
+        private void InitializeCompositePartProperties()
+        {
+            var currentCompositePart = m_BindingProperty.FindPropertyRelative("m_Name").stringValue;
+
+            ////REVIEW: this makes a lot of assumptions about the serialized data based on the one property we've been given in the ctor
+            // Determine the name of the current composite type that the part belongs to.
+            var bindingArrayProperty = m_BindingProperty.GetArrayPropertyFromElement();
+            var partBindingIndex = InputActionSerializationHelpers.GetIndex(bindingArrayProperty, m_BindingProperty);
+            var compositeBindingIndex =
+                InputActionSerializationHelpers.GetCompositeStartIndex(bindingArrayProperty, partBindingIndex);
+            if (compositeBindingIndex == -1)
+                return;
+            var compositeBindingProperty = bindingArrayProperty.GetArrayElementAtIndex(compositeBindingIndex);
+            var compositePath = compositeBindingProperty.FindPropertyRelative("m_Path").stringValue;
+            var compositeNameAndParameters = NameAndParameters.Parse(compositePath);
+
+            // Initialize option list from all parts available for the composite.
+            var optionList = new List<GUIContent>();
+            var nameList = new List<string>();
+            var currentIndex = 0;
+            var selectedPartNameIndex = -1;
+            foreach (var partName in InputBindingComposite.GetPartNames(compositeNameAndParameters.name))
+            {
+                if (partName.Equals(currentCompositePart, StringComparison.InvariantCultureIgnoreCase))
+                    selectedPartNameIndex = currentIndex;
+                var niceName = ObjectNames.NicifyVariableName(partName);
+                optionList.Add(new GUIContent(niceName));
+                nameList.Add(partName);
+                ++currentIndex;
+            }
+
+            // If currently selected part is not in list, add it as an option.
+            if (selectedPartNameIndex == -1)
+            {
+                selectedPartNameIndex = nameList.Count;
+                optionList.Add(new GUIContent(ObjectNames.NicifyVariableName(currentCompositePart)));
+                nameList.Add(currentCompositePart);
+            }
+
+            m_CompositeParts = nameList.ToArray();
+            m_CompositePartOptions = optionList.ToArray();
+            m_SelectedCompositePart = selectedPartNameIndex;
+        }
+
+        private void OnCompositeParametersModified()
+        {
+            Debug.Assert(m_CompositeParameters != null);
+
+            var path = m_PathProperty.stringValue;
+            var nameAndParameters = NameAndParameters.Parse(path);
+            nameAndParameters.parameters = m_CompositeParameters.GetParameters();
+
+            m_PathProperty.stringValue = nameAndParameters.ToString();
+            m_PathProperty.serializedObject.ApplyModifiedProperties();
+
+            OnPathChanged();
+        }
+
+        private void OnBindingGroupsChanged()
+        {
+            m_GroupsProperty.stringValue = string.Join(InputBinding.kSeparatorString, m_BindingGroups.ToArray());
+            m_GroupsProperty.serializedObject.ApplyModifiedProperties();
+
+            onChange?.Invoke(k_GroupsChanged);
+        }
+
+        private void OnPathChanged()
+        {
+            m_BindingProperty.serializedObject.ApplyModifiedProperties();
+            onChange?.Invoke(k_PathChanged);
+        }
+
+        private void OnCompositeTypeChanged()
+        {
+            var nameAndParameters = new NameAndParameters
+            {
+                name = m_CompositeTypes[m_SelectedCompositeType],
+                parameters = m_CompositeParameters.GetParameters()
+            };
+
+            InputActionSerializationHelpers.ChangeCompositeBindingType(m_BindingProperty, nameAndParameters);
+            m_PathProperty.serializedObject.ApplyModifiedProperties();
+
+            onChange?.Invoke(k_CompositeTypeChanged);
+        }
+
+        private void OnCompositePartAssignmentChanged()
+        {
+            m_BindingProperty.FindPropertyRelative("m_Name").stringValue = m_CompositeParts[m_SelectedCompositePart];
+            m_BindingProperty.serializedObject.ApplyModifiedProperties();
+
+            onChange?.Invoke(k_CompositePartAssignmentChanged);
+        }
+
+        private readonly bool m_IsComposite;
+        private ParameterListView m_CompositeParameters;
+        private int m_SelectedCompositeType;
+        private GUIContent[] m_CompositeTypeOptions;
+        private string[] m_CompositeTypes;
+
+        private int m_SelectedCompositePart;
+        private GUIContent[] m_CompositePartOptions;
+        private string[] m_CompositeParts;
+
+        private readonly SerializedProperty m_GroupsProperty;
+        private readonly SerializedProperty m_BindingProperty;
+        private readonly SerializedProperty m_PathProperty;
+
+        private readonly InputControlPickerState m_ControlPickerState;
+        private readonly InputControlPathEditor m_ControlPathEditor;
+
+        private static readonly GUIContent s_CompositeTypeLabel = EditorGUIUtility.TrTextContent("Composite Type",
+            "Type of composite. Allows changing the composite type retroactively. Doing so will modify the bindings that are part of the composite.");
+        private static readonly GUIContent s_UseInControlSchemesLAbel = EditorGUIUtility.TrTextContent("Use in control scheme",
+            "In which control schemes the binding is active. A binding can be used by arbitrary many control schemes. If a binding is not "
+            + "assigned to a specific control schemes, it is active in all of them.");
+        private static readonly GUIContent s_CompositePartAssignmentLabel = EditorGUIUtility.TrTextContent(
+            "Composite Part",
+            "The named part of the composite that the binding is assigned to. Multiple bindings may be assigned the same part. All controls from "
+            + "all bindings that are assigned the same part will collectively feed values into that part of the composite.");
+
+        private ReadOnlyArray<InputControlScheme> m_ControlSchemes;
+        private readonly List<string> m_BindingGroups;
+        private readonly string m_ExpectedControlLayout;
+    }
+}
+#endif // UNITY_EDITOR

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Editor/AssetEditor/InputBindingPropertiesView.cs.meta

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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Editor/AssetEditor/NameAndParameterListView.cs

@@ -0,0 +1,229 @@
+#if UNITY_EDITOR
+using System;
+using System.Linq;
+using System.Reflection;
+using UnityEditor;
+using UnityEditorInternal;
+using UnityEngine.InputSystem.Utilities;
+
+namespace UnityEngine.InputSystem.Editor.Lists
+{
+    /// <summary>
+    /// A <see cref="ReorderableList"/> to manage a set of name-and-parameter pairs and a <see cref="ParameterListView"/>
+    /// to edit the parameters of the currently selected pair.
+    /// </summary>
+    /// <remarks>
+    /// Produces output that can be consumed by <see cref="NameAndParameters.ParseMultiple"/>.
+    /// </remarks>
+    internal abstract class NameAndParameterListView
+    {
+        protected NameAndParameterListView(SerializedProperty property, Action applyAction, string expectedControlLayout, TypeTable listOptions, Func<Type, Type> getValueType, string itemName)
+        {
+            m_ItemName = itemName;
+            m_GetValueType = getValueType;
+            m_DeleteButton = EditorGUIUtility.TrIconContent("Toolbar Minus", $"Delete {itemName}");
+            m_UpButton = EditorGUIUtility.TrIconContent(GUIHelpers.LoadIcon("ChevronUp"), $"Move {itemName} up");
+            m_DownButton = EditorGUIUtility.TrIconContent(GUIHelpers.LoadIcon("ChevronDown"), $"Move {itemName} down");
+
+            m_Property = property;
+            m_Apply = applyAction;
+            m_ListOptions = listOptions;
+
+            m_ExpectedControlLayout = expectedControlLayout;
+            if (!string.IsNullOrEmpty(m_ExpectedControlLayout))
+                m_ExpectedValueType = EditorInputControlLayoutCache.GetValueType(m_ExpectedControlLayout);
+
+            m_ParametersForEachListItem = NameAndParameters.ParseMultiple(m_Property.stringValue).ToArray();
+            m_EditableParametersForEachListItem = new ParameterListView[m_ParametersForEachListItem.Length];
+
+            for (var i = 0; i < m_ParametersForEachListItem.Length; i++)
+            {
+                m_EditableParametersForEachListItem[i] = new ParameterListView { onChange = OnParametersChanged };
+                var typeName = m_ParametersForEachListItem[i].name;
+                var rowType = m_ListOptions.LookupTypeRegistration(typeName);
+                m_EditableParametersForEachListItem[i].Initialize(rowType, m_ParametersForEachListItem[i].parameters);
+
+                var name = ObjectNames.NicifyVariableName(typeName);
+
+                ////REVIEW: finding this kind of stuff should probably have better support globally on the asset; e.g. some
+                ////        notification that pops up and allows fixing all occurrences in one click
+                // Find out if we still support this option and indicate it in the list, if we don't.
+                if (rowType == null)
+                    name += " (Obsolete)";
+                else if (m_ExpectedValueType != null)
+                {
+                    var valueType = getValueType(rowType);
+                    if (valueType != null && !m_ExpectedValueType.IsAssignableFrom(valueType))
+                        name += " (Incompatible Value Type)";
+                }
+                m_EditableParametersForEachListItem[i].name = name;
+            }
+        }
+
+        public void OnAddDropdown(Rect r)
+        {
+            // Add only original names to the menu and not aliases.
+            var menu = new GenericMenu();
+            foreach (var name in m_ListOptions.internedNames.Where(x => !m_ListOptions.ShouldHideInUI(x)).OrderBy(x => x.ToString()))
+            {
+                // Skip if not compatible with value type.
+                if (m_ExpectedValueType != null)
+                {
+                    var type = m_ListOptions.LookupTypeRegistration(name);
+                    var valueType = m_GetValueType(type);
+                    if (valueType != null && !m_ExpectedValueType.IsAssignableFrom(valueType))
+                        continue;
+                }
+
+                var niceName = ObjectNames.NicifyVariableName(name);
+                menu.AddItem(new GUIContent(niceName), false, OnAddElement, name.ToString());
+            }
+            menu.ShowAsContext();
+        }
+
+        private void OnAddElement(object data)
+        {
+            var name = (string)data;
+
+            ArrayHelpers.Append(ref m_ParametersForEachListItem,
+                new NameAndParameters {name = name});
+            ArrayHelpers.Append(ref m_EditableParametersForEachListItem,
+                new ParameterListView { onChange = OnParametersChanged });
+
+            var index = m_EditableParametersForEachListItem.Length - 1;
+            var typeName = m_ParametersForEachListItem[index].name;
+            var rowType = m_ListOptions.LookupTypeRegistration(typeName);
+            m_EditableParametersForEachListItem[index].Initialize(rowType, m_ParametersForEachListItem[index].parameters);
+            m_EditableParametersForEachListItem[index].name = ObjectNames.NicifyVariableName(name);
+
+            m_Apply();
+        }
+
+        private void OnParametersChanged()
+        {
+            for (var i = 0; i < m_ParametersForEachListItem.Length; i++)
+            {
+                m_ParametersForEachListItem[i] = new NameAndParameters
+                {
+                    name = m_ParametersForEachListItem[i].name,
+                    parameters = m_EditableParametersForEachListItem[i].GetParameters(),
+                };
+            }
+
+            m_Apply();
+        }
+
+        private static class Styles
+        {
+            public static readonly GUIStyle s_FoldoutStyle = new GUIStyle("foldout").WithFontStyle(FontStyle.Bold);
+            public static readonly GUIStyle s_UpDownButtonStyle = new GUIStyle("label").WithFixedWidth(12).WithFixedHeight(12).WithPadding(new RectOffset());
+        }
+
+        private void SwapEntry(int oldIndex, int newIndex)
+        {
+            MemoryHelpers.Swap(ref m_ParametersForEachListItem[oldIndex], ref m_ParametersForEachListItem[newIndex]);
+            MemoryHelpers.Swap(ref m_EditableParametersForEachListItem[oldIndex], ref m_EditableParametersForEachListItem[newIndex]);
+            m_Apply();
+        }
+
+        public void OnGUI()
+        {
+            if (m_EditableParametersForEachListItem == null || m_EditableParametersForEachListItem.Length == 0)
+            {
+                using (new EditorGUI.DisabledScope(true))
+                {
+                    EditorGUI.indentLevel++;
+                    EditorGUILayout.LabelField($"No {m_ItemName}s have been added.");
+                    EditorGUI.indentLevel--;
+                }
+            }
+            else
+                for (var i = 0; i < m_EditableParametersForEachListItem.Length; i++)
+                {
+                    var editableParams = m_EditableParametersForEachListItem[i];
+                    EditorGUILayout.BeginHorizontal();
+                    if (editableParams.hasUIToShow)
+                        editableParams.visible = EditorGUILayout.Foldout(editableParams.visible, editableParams.name, true, Styles.s_FoldoutStyle);
+                    else
+                    {
+                        GUILayout.Space(16);
+                        EditorGUILayout.LabelField(editableParams.name, EditorStyles.boldLabel);
+                    }
+                    GUILayout.FlexibleSpace();
+                    using (new EditorGUI.DisabledScope(i == 0))
+                    {
+                        if (GUILayout.Button(m_UpButton, Styles.s_UpDownButtonStyle))
+                            SwapEntry(i, i - 1);
+                    }
+                    using (new EditorGUI.DisabledScope(i == m_EditableParametersForEachListItem.Length - 1))
+                    {
+                        if (GUILayout.Button(m_DownButton, Styles.s_UpDownButtonStyle))
+                            SwapEntry(i, i + 1);
+                    }
+                    if (GUILayout.Button(m_DeleteButton, EditorStyles.label))
+                    {
+                        // Unfocus controls, because otherwise, the editor can get confused and have text from a text field
+                        // on the deleted item leak to a different field.
+                        GUI.FocusControl(null);
+                        ArrayHelpers.EraseAt(ref m_ParametersForEachListItem, i);
+                        ArrayHelpers.EraseAt(ref m_EditableParametersForEachListItem, i);
+                        m_Apply();
+                        GUIUtility.ExitGUI();
+                    }
+                    EditorGUILayout.EndHorizontal();
+                    if (editableParams.visible)
+                    {
+                        EditorGUI.indentLevel++;
+                        editableParams.OnGUI();
+                        EditorGUI.indentLevel--;
+                    }
+                    GUIHelpers.DrawLineSeparator();
+                }
+        }
+
+        public string ToSerializableString()
+        {
+            if (m_ParametersForEachListItem == null)
+                return string.Empty;
+
+            return string.Join(NamedValue.Separator,
+                m_ParametersForEachListItem.Select(x => x.ToString()).ToArray());
+        }
+
+        private Func<Type, Type> m_GetValueType;
+        private SerializedProperty m_Property;
+        private readonly TypeTable m_ListOptions;
+        private readonly string m_ExpectedControlLayout;
+        private readonly Type m_ExpectedValueType;
+        private readonly GUIContent m_DeleteButton;
+        private readonly GUIContent m_UpButton;
+        private readonly GUIContent m_DownButton;
+        private NameAndParameters[] m_ParametersForEachListItem;
+        private ParameterListView[] m_EditableParametersForEachListItem;
+        private readonly Action m_Apply;
+        private string m_ItemName;
+    }
+
+    /// <summary>
+    /// A list of processors and their parameters.
+    /// </summary>
+    internal class ProcessorsListView : NameAndParameterListView
+    {
+        public ProcessorsListView(SerializedProperty property, Action applyAction, string expectedControlLayout)
+            : base(property, applyAction, expectedControlLayout, InputProcessor.s_Processors, InputProcessor.GetValueTypeFromType, "Processor")
+        {
+        }
+    }
+
+    /// <summary>
+    /// A list view of interactions and their parameters.
+    /// </summary>
+    internal class InteractionsListView : NameAndParameterListView
+    {
+        public InteractionsListView(SerializedProperty property, Action applyAction, string expectedControlLayout)
+            : base(property, applyAction, expectedControlLayout, InputInteraction.s_Interactions, InputInteraction.GetValueType, "Interaction")
+        {
+        }
+    }
+}
+#endif // UNITY_EDITOR

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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Editor/AssetEditor/ParameterListView.cs

@@ -0,0 +1,454 @@
+#if UNITY_EDITOR
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using UnityEditor;
+using UnityEditor.UIElements;
+using UnityEngine.InputSystem.Layouts;
+using UnityEngine.InputSystem.Utilities;
+using UnityEngine.UIElements;
+
+////TODO: show description of interaction or processor when selected
+
+namespace UnityEngine.InputSystem.Editor.Lists
+{
+    /// <summary>
+    /// Inspector-like functionality for editing parameter lists as used in <see cref="InputControlLayout"/>.
+    /// </summary>
+    /// <remarks>
+    /// This can be used for parameters on interactions, processors, and composites.
+    ///
+    /// Call <see cref="Initialize"/> to set up (can be done repeatedly on the same instance). Call
+    /// <see cref="OnGUI"/> to render.
+    ///
+    /// Custom parameter GUIs can be defined by deriving from <see cref="InputParameterEditor{TObject}"/>.
+    /// This class will automatically incorporate custom GUIs and fall back to default GUIs where no custom
+    /// ones are defined.
+    /// </remarks>
+    internal class ParameterListView
+    {
+        /// <summary>
+        /// Invoked whenever a parameter is changed.
+        /// </summary>
+        public Action onChange { get; set; }
+
+        public bool hasUIToShow => (m_Parameters != null && m_Parameters.Length > 0) || m_ParameterEditor != null;
+        public bool visible { get; set; }
+        public string name { get; set; }
+
+        /// <summary>
+        /// Get the current parameter values according to the editor state.
+        /// </summary>
+        /// <returns>An array of parameter values.</returns>
+        public NamedValue[] GetParameters()
+        {
+            if (m_Parameters == null)
+                return null;
+
+            // See if we have parameters that aren't at their default value.
+            var countOfParametersNotAtDefaultValue = 0;
+            for (var i = 0; i < m_Parameters.Length; ++i)
+            {
+                if (!m_Parameters[i].isAtDefault)
+                    ++countOfParametersNotAtDefaultValue;
+            }
+
+            // If not, we return null.
+            if (countOfParametersNotAtDefaultValue == 0)
+                return null;
+
+            // Collect non-default parameter values.
+            var result = new NamedValue[countOfParametersNotAtDefaultValue];
+            var index = 0;
+            for (var i = 0; i < m_Parameters.Length; ++i)
+            {
+                var parameter = m_Parameters[i];
+                if (parameter.isAtDefault)
+                    continue;
+
+                result[index++] = parameter.value;
+            }
+
+            return result;
+        }
+
+        /// <summary>
+        /// Initialize the parameter list view based on the given registered type that has parameters to edit. This can be
+        /// things such as interactions, processors, or composites.
+        /// </summary>
+        /// <param name="registeredType">Type of object that the parameters will be passed to at runtime.
+        /// We need this to be able to determine the possible set of parameters and their possible values. This
+        /// can be a class implementing <see cref="IInputInteraction"/>, for example.</param>
+        /// <param name="existingParameters">List of existing parameters. Can be empty.</param>
+        public void Initialize(Type registeredType, ReadOnlyArray<NamedValue> existingParameters)
+        {
+            if (registeredType == null)
+            {
+                // No registered type. This usually happens when data references a registration that has
+                // been removed in the meantime (e.g. an interaction that is no longer supported). We want
+                // to accept this case and simply pretend that the given type has no parameters.
+
+                Clear();
+                return;
+            }
+
+            visible = true;
+
+            // Try to instantiate object so that we can determine defaults.
+            object instance = null;
+            try
+            {
+                instance = Activator.CreateInstance(registeredType);
+            }
+            catch (Exception)
+            {
+                // Swallow. If we can't create an instance, we simply assume no defaults.
+            }
+
+            var parameters = new List<EditableParameterValue>();
+
+            ////REVIEW: support properties here?
+            // Go through public instance fields and add every parameter found on the registered
+            // type.
+            var fields = registeredType.GetFields(BindingFlags.Public | BindingFlags.Instance);
+            foreach (var field in fields)
+            {
+                // Skip all fields that have an [InputControl] attribute. This is relevant
+                // only for composites, but we just always do it here.
+                if (field.GetCustomAttribute<InputControlAttribute>(false) != null)
+                    continue;
+
+                // Determine parameter name from field.
+                var parameter = new EditableParameterValue {field = field};
+                var name = field.Name;
+                parameter.value.name = name;
+
+                // Determine parameter type from field.
+                var fieldType = field.FieldType;
+                if (fieldType.IsEnum)
+                {
+                    // For enums, we want the underlying integer type.
+                    var underlyingType = fieldType.GetEnumUnderlyingType();
+                    var underlyingTypeCode = Type.GetTypeCode(underlyingType);
+
+                    parameter.value = parameter.value.ConvertTo(underlyingTypeCode);
+
+                    // Read enum names and values.
+                    parameter.enumNames = Enum.GetNames(fieldType).Select(x => new GUIContent(x)).ToArray();
+                    ////REVIEW: this probably falls apart if multiple members have the same value
+                    var list = new List<int>();
+                    foreach (var value in Enum.GetValues(fieldType))
+                        list.Add((int)value);
+                    parameter.enumValues = list.ToArray();
+                }
+                else
+                {
+                    var typeCode = Type.GetTypeCode(fieldType);
+                    parameter.value = parameter.value.ConvertTo(typeCode);
+                }
+
+                // Determine default value.
+                if (instance != null)
+                {
+                    try
+                    {
+                        var value = field.GetValue(instance);
+                        parameter.defaultValue = new NamedValue
+                        {
+                            name = name,
+                            value = PrimitiveValue.FromObject(value)
+                        };
+                    }
+                    catch
+                    {
+                        // If the getter throws, ignore. All we lose is the actual default value from
+                        // the field.
+                    }
+                }
+
+                // If the parameter already exists in the given list, maintain its value.
+                var existingParameterIndex = existingParameters.IndexOf(x => x.name == field.Name);
+                if (existingParameterIndex >= 0)
+                {
+                    // Make sure we're preserving the right type.
+                    parameter.value = existingParameters[existingParameterIndex].ConvertTo(parameter.value.type);
+                }
+                else
+                {
+                    // Not assigned. Set to default.
+                    if (parameter.defaultValue != null)
+                        parameter.value = parameter.defaultValue.Value;
+                }
+
+                // Add.
+                parameters.Add(parameter);
+            }
+
+            m_Parameters = parameters.ToArray();
+
+            // See if we have a dedicated parameter editor.
+            var parameterEditorType = InputParameterEditor.LookupEditorForType(registeredType);
+            if (parameterEditorType != null)
+            {
+                // Create an editor instance and hand it the instance we created. Unlike our default
+                // editing logic, on this path we will be operating on an object instance that contains
+                // the parameter values. So on this path, we actually need to update the object to reflect
+                // the current parameter values.
+
+                NamedValue.ApplyAllToObject(instance, m_Parameters.Select(x => x.value));
+
+                m_ParameterEditor = (InputParameterEditor)Activator.CreateInstance(parameterEditorType);
+
+                // We have to jump through some hoops here to create instances of any CustomOrDefaultSetting fields on the
+                // parameter editor. This is because those types changed from structs to classes when UIToolkit was
+                // introduced, and we don't want to force users to have to create those instances manually on any of their
+                // own editors.
+                var genericArgumentType = TypeHelpers.GetGenericTypeArgumentFromHierarchy(parameterEditorType,
+                    typeof(InputParameterEditor<>), 0);
+                if (genericArgumentType != null)
+                {
+                    var fieldInfos = parameterEditorType
+                        .GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
+                    var customOrDefaultGenericType = typeof(InputParameterEditor<>.CustomOrDefaultSetting);
+                    var customOrDefaultType = customOrDefaultGenericType.MakeGenericType(genericArgumentType);
+                    foreach (var customOrDefaultEditorField in fieldInfos.Where(f => f.FieldType == customOrDefaultType))
+                    {
+                        customOrDefaultEditorField.SetValue(m_ParameterEditor, Activator.CreateInstance(customOrDefaultEditorField.FieldType));
+                    }
+                }
+                m_ParameterEditor.SetTarget(instance);
+            }
+            else
+            {
+                m_ParameterEditor = null;
+
+                // Create parameter labels.
+                m_ParameterLabels = new GUIContent[m_Parameters.Length];
+                for (var i = 0; i < m_Parameters.Length; ++i)
+                {
+                    // Look up tooltip from field.
+                    var tooltip = string.Empty;
+                    var field = m_Parameters[i].field;
+                    var tooltipAttribute = field.GetCustomAttribute<TooltipAttribute>();
+                    if (tooltipAttribute != null)
+                        tooltip = tooltipAttribute.tooltip;
+
+                    // Create label.
+                    var niceName = ObjectNames.NicifyVariableName(m_Parameters[i].value.name);
+                    m_ParameterLabels[i] = new GUIContent(niceName, tooltip);
+                }
+            }
+        }
+
+        public void Clear()
+        {
+            m_Parameters = null;
+            m_ParameterEditor = null;
+        }
+
+#if UNITY_INPUT_SYSTEM_PROJECT_WIDE_ACTIONS
+        public void OnDrawVisualElements(VisualElement root)
+        {
+            if (m_ParameterEditor != null)
+            {
+                m_ParameterEditor.OnDrawVisualElements(root, OnValuesChanged);
+                return;
+            }
+
+            if (m_Parameters == null)
+                return;
+
+            void OnValueChanged(ref EditableParameterValue parameter, object result, int i)
+            {
+                parameter.value.value = PrimitiveValue.FromObject(result).ConvertTo(parameter.value.type);
+                m_Parameters[i] = parameter;
+            }
+
+            void OnEditEnd()
+            {
+                onChange?.Invoke();
+            }
+
+            for (var i = 0; i < m_Parameters.Length; i++)
+            {
+                var parameter = m_Parameters[i];
+                var label = m_ParameterLabels[i];
+                var closedIndex = i;
+
+                if (parameter.isEnum)
+                {
+                    var intValue = parameter.value.value.ToInt32();
+                    var field = new DropdownField(label.text, parameter.enumNames.Select(x => x.text).ToList(), intValue);
+                    field.RegisterValueChangedCallback(evt => OnValueChanged(ref parameter, field.index, closedIndex));
+                    field.RegisterCallback<BlurEvent>(_ => OnEditEnd());
+                    root.Add(field);
+                }
+                else if (parameter.value.type == TypeCode.Int64 || parameter.value.type == TypeCode.UInt64)
+                {
+                    var longValue = parameter.value.value.ToInt64();
+                    var field = new LongField(label.text) { value = longValue };
+                    field.RegisterValueChangedCallback(evt => OnValueChanged(ref parameter, evt.newValue, closedIndex));
+                    field.RegisterCallback<BlurEvent>(_ => OnEditEnd());
+                    root.Add(field);
+                }
+                else if (parameter.value.type.IsInt())
+                {
+                    var intValue = parameter.value.value.ToInt32();
+                    var field = new IntegerField(label.text) { value = intValue };
+                    field.RegisterValueChangedCallback(evt => OnValueChanged(ref parameter, evt.newValue, closedIndex));
+                    field.RegisterCallback<BlurEvent>(_ => OnEditEnd());
+                    root.Add(field);
+                }
+                else if (parameter.value.type == TypeCode.Single)
+                {
+                    var floatValue = parameter.value.value.ToSingle();
+                    var field = new FloatField(label.text) { value = floatValue };
+                    field.RegisterValueChangedCallback(evt => OnValueChanged(ref parameter, evt.newValue, closedIndex));
+                    field.RegisterCallback<BlurEvent>(_ => OnEditEnd());
+                    root.Add(field);
+                }
+                else if (parameter.value.type == TypeCode.Double)
+                {
+                    var floatValue = parameter.value.value.ToDouble();
+                    var field = new DoubleField(label.text) { value = floatValue };
+                    field.RegisterValueChangedCallback(evt => OnValueChanged(ref parameter, evt.newValue, closedIndex));
+                    field.RegisterCallback<BlurEvent>(_ => OnEditEnd());
+                    root.Add(field);
+                }
+                else if (parameter.value.type == TypeCode.Boolean)
+                {
+                    var boolValue = parameter.value.value.ToBoolean();
+                    var field = new Toggle(label.text) { value = boolValue };
+                    field.RegisterValueChangedCallback(evt => OnValueChanged(ref parameter, evt.newValue, closedIndex));
+                    field.RegisterValueChangedCallback(_ => OnEditEnd());
+                    root.Add(field);
+                }
+            }
+        }
+
+#endif
+
+        private void OnValuesChanged()
+        {
+            ReadParameterValuesFrom(m_ParameterEditor.target);
+            onChange?.Invoke();
+        }
+
+        public void OnGUI()
+        {
+            // If we have a dedicated parameter editor, let it do all the work.
+            if (m_ParameterEditor != null)
+            {
+                EditorGUI.BeginChangeCheck();
+                m_ParameterEditor.OnGUI();
+                if (EditorGUI.EndChangeCheck())
+                {
+                    ReadParameterValuesFrom(m_ParameterEditor.target);
+                    onChange?.Invoke();
+                }
+                return;
+            }
+
+#if UNITY_INPUT_SYSTEM_PROJECT_WIDE_ACTIONS
+            // handled by OnDrawVisualElements with UI Toolkit
+            if (!InputSystem.settings.IsFeatureEnabled(InputFeatureNames.kUseIMGUIEditorForAssets)) return;
+#endif
+            // Otherwise, fall back to our default logic.
+            if (m_Parameters == null)
+                return;
+            for (var i = 0; i < m_Parameters.Length; i++)
+            {
+                var parameter = m_Parameters[i];
+                var label = m_ParameterLabels[i];
+
+                EditorGUI.BeginChangeCheck();
+
+                object result = null;
+                if (parameter.isEnum)
+                {
+                    var intValue = parameter.value.value.ToInt32();
+                    result = EditorGUILayout.IntPopup(label, intValue, parameter.enumNames, parameter.enumValues);
+                }
+                else if (parameter.value.type == TypeCode.Int64 || parameter.value.type == TypeCode.UInt64)
+                {
+                    var longValue = parameter.value.value.ToInt64();
+                    result = EditorGUILayout.LongField(label, longValue);
+                }
+                else if (parameter.value.type.IsInt())
+                {
+                    var intValue = parameter.value.value.ToInt32();
+                    result = EditorGUILayout.IntField(label, intValue);
+                }
+                else if (parameter.value.type == TypeCode.Single)
+                {
+                    var floatValue = parameter.value.value.ToSingle();
+                    result = EditorGUILayout.FloatField(label, floatValue);
+                }
+                else if (parameter.value.type == TypeCode.Double)
+                {
+                    var floatValue = parameter.value.value.ToDouble();
+                    result = EditorGUILayout.DoubleField(label, floatValue);
+                }
+                else if (parameter.value.type == TypeCode.Boolean)
+                {
+                    var boolValue = parameter.value.value.ToBoolean();
+                    result = EditorGUILayout.Toggle(label, boolValue);
+                }
+
+                if (EditorGUI.EndChangeCheck())
+                {
+                    parameter.value.value = PrimitiveValue.FromObject(result).ConvertTo(parameter.value.type);
+                    m_Parameters[i] = parameter;
+                    onChange?.Invoke();
+                }
+            }
+        }
+
+        ////REVIEW: check whether parameters have *actually* changed?
+        /// <summary>
+        /// Refresh <see cref="m_Parameters"/> from the current parameter values in <paramref name="target"/>.
+        /// </summary>
+        /// <param name="target">An instance of the current type we are editing parameters on.</param>
+        private void ReadParameterValuesFrom(object target)
+        {
+            if (m_Parameters == null)
+                return;
+
+            for (var i = 0; i < m_Parameters.Length; ++i)
+            {
+                var parameter = m_Parameters[i];
+
+                object value = null;
+                try
+                {
+                    value = parameter.field.GetValue(target);
+                }
+                catch
+                {
+                    // Ignore exceptions from getters.
+                }
+
+                m_Parameters[i].value.value = PrimitiveValue.FromObject(value).ConvertTo(parameter.value.type);
+            }
+        }
+
+        private InputParameterEditor m_ParameterEditor;
+        private EditableParameterValue[] m_Parameters;
+        private GUIContent[] m_ParameterLabels;
+
+        private struct EditableParameterValue
+        {
+            public NamedValue value;
+            public NamedValue? defaultValue;
+            public int[] enumValues;
+            public GUIContent[] enumNames;
+            public FieldInfo field;
+
+            public bool isEnum => enumValues != null;
+            public bool isAtDefault => defaultValue != null && value == defaultValue.Value;
+        }
+    }
+}
+
+#endif // UNITY_EDITOR

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Editor/AssetEditor/ParameterListView.cs.meta

@@ -0,0 +1,11 @@
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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Editor/AssetEditor/PropertiesViewBase.cs

@@ -0,0 +1,146 @@
+#if UNITY_EDITOR
+using System;
+using UnityEditor;
+using UnityEngine.InputSystem.Editor.Lists;
+using UnityEngine.InputSystem.Utilities;
+
+////TODO: show parameters for selected interaction or processor inline in list rather than separately underneath list
+
+namespace UnityEngine.InputSystem.Editor
+{
+    /// <summary>
+    /// Base class for views that show the properties of actions or bindings.
+    /// </summary>
+    internal abstract class PropertiesViewBase
+    {
+        protected PropertiesViewBase(string label, SerializedProperty bindingOrAction, Action<FourCC> onChange, string expectedControlLayout = null)
+        {
+            if (bindingOrAction == null)
+                throw new ArgumentNullException(nameof(bindingOrAction));
+
+            m_InteractionsProperty = bindingOrAction.FindPropertyRelative("m_Interactions");
+            m_ProcessorsProperty = bindingOrAction.FindPropertyRelative("m_Processors");
+
+            m_InteractionsList = new InteractionsListView(m_InteractionsProperty, OnInteractionsModified, expectedControlLayout);
+            UpdateProcessors(expectedControlLayout);
+
+            m_OnChange = onChange;
+            m_GeneralFoldoutLabel = EditorGUIUtility.TrTextContent(label);
+        }
+
+        protected void UpdateProcessors(string expectedControlLayout)
+        {
+            m_ProcessorsList = new ProcessorsListView(m_ProcessorsProperty, OnProcessorsModified, expectedControlLayout);
+        }
+
+        public void OnGUI()
+        {
+            EditorGUILayout.BeginVertical();
+            DrawGeneralGroup();
+            if (!m_IsPartOfComposite)
+            {
+                EditorGUILayout.Space();
+                DrawInteractionsGroup();
+            }
+            EditorGUILayout.Space();
+            DrawProcessorsGroup();
+            GUILayout.FlexibleSpace();
+            EditorGUILayout.EndVertical();
+        }
+
+        protected abstract void DrawGeneralProperties();
+
+        private void DrawGeneralGroup()
+        {
+            m_GeneralFoldout = DrawFoldout(m_GeneralFoldoutLabel, m_GeneralFoldout);
+            if (m_GeneralFoldout)
+            {
+                EditorGUI.indentLevel++;
+                DrawGeneralProperties();
+                EditorGUI.indentLevel--;
+            }
+        }
+
+        private void DrawProcessorsGroup()
+        {
+            m_ProcessorsFoldout = DrawFoldout(s_ProcessorsFoldoutLabel, m_ProcessorsFoldout, s_ProcessorsAddButton, m_ProcessorsList.OnAddDropdown);
+            if (m_ProcessorsFoldout)
+                m_ProcessorsList.OnGUI();
+        }
+
+        private void DrawInteractionsGroup()
+        {
+            m_InteractionsFoldout = DrawFoldout(s_InteractionsFoldoutLabel, m_InteractionsFoldout, s_InteractionsAddButton, m_InteractionsList.OnAddDropdown);
+            if (m_InteractionsFoldout)
+                m_InteractionsList.OnGUI();
+        }
+
+        private static bool DrawFoldout(GUIContent content, bool folded, GUIContent addButton = null, Action<Rect> addDropDown = null)
+        {
+            const int k_PopupSize = 20;
+            var bgRect = GUILayoutUtility.GetRect(content, Styles.s_FoldoutBackgroundStyle);
+            EditorGUI.LabelField(bgRect, GUIContent.none, Styles.s_FoldoutBackgroundStyle);
+            var foldoutRect = bgRect;
+            foldoutRect.xMax -= k_PopupSize;
+            var retval = EditorGUI.Foldout(foldoutRect, folded, content, true, Styles.s_FoldoutStyle);
+            if (addButton != null)
+            {
+                var popupRect = bgRect;
+                popupRect.xMin = popupRect.xMax - k_PopupSize;
+                if (GUI.Button(popupRect, addButton, EditorStyles.label))
+                    addDropDown(popupRect);
+            }
+            return retval;
+        }
+
+        private void OnProcessorsModified()
+        {
+            m_ProcessorsProperty.stringValue = m_ProcessorsList.ToSerializableString();
+            m_ProcessorsProperty.serializedObject.ApplyModifiedProperties();
+            m_OnChange(k_ProcessorsChanged);
+        }
+
+        private void OnInteractionsModified()
+        {
+            m_InteractionsProperty.stringValue = m_InteractionsList.ToSerializableString();
+            m_InteractionsProperty.serializedObject.ApplyModifiedProperties();
+            m_OnChange(k_InteractionsChanged);
+        }
+
+        public Action<FourCC> onChange => m_OnChange;
+
+        private bool m_GeneralFoldout = true;
+        private bool m_InteractionsFoldout = true;
+        private bool m_ProcessorsFoldout = true;
+        protected bool m_IsPartOfComposite;
+
+        private readonly Action<FourCC> m_OnChange;
+
+        private readonly InteractionsListView m_InteractionsList;
+        private ProcessorsListView m_ProcessorsList;
+
+        private readonly SerializedProperty m_InteractionsProperty;
+        private readonly SerializedProperty m_ProcessorsProperty;
+
+        private readonly GUIContent m_GeneralFoldoutLabel;
+
+        ////TODO: tooltips
+        private static readonly GUIContent s_ProcessorsFoldoutLabel = EditorGUIUtility.TrTextContent("Processors");
+        public static readonly GUIContent s_ProcessorsAddButton = EditorGUIUtility.TrIconContent("Toolbar Plus More", "Add Processor");
+        private static readonly GUIContent s_InteractionsFoldoutLabel = EditorGUIUtility.TrTextContent("Interactions");
+        public static readonly GUIContent s_InteractionsAddButton = EditorGUIUtility.TrIconContent("Toolbar Plus More", "Add Interaction");
+
+        public static FourCC k_InteractionsChanged => new FourCC("IACT");
+        public static FourCC k_ProcessorsChanged => new FourCC("PROC");
+
+        private static class Styles
+        {
+            public static readonly GUIStyle s_FoldoutBackgroundStyle = new GUIStyle("Label")
+                .WithNormalBackground(AssetDatabase.LoadAssetAtPath<Texture2D>(InputActionTreeView.ResourcesPath + "foldoutBackground.png"))
+                .WithBorder(new RectOffset(3, 3, 3, 3))
+                .WithMargin(new RectOffset(1, 1, 3, 3));
+            public static readonly GUIStyle s_FoldoutStyle = new GUIStyle("foldout");
+        }
+    }
+}
+#endif // UNITY_EDITOR

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Editor/AssetEditor/PropertiesViewBase.cs.meta

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