Assembly definitions added

Scripts/Duck.Forms.asmdef

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+{
+	"name": "Duck.Forms"
+}

Scripts/Editor/Duck.Forms.Editor.asmdef

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+{
+    "name": "Duck.Forms.Editor",
+    "references": [
+        "GUID:3ccb158d1f7a14482916322a7272767a"
+    ],
+    "optionalUnityReferences": [],
+    "includePlatforms": [
+        "Editor"
+    ],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": [],
+    "versionDefines": []
+}

Scripts/Editor/SelectableFocusSwitcherEditor.cs

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+using UnityEngine;
+using UnityEditor;
+using UnityEditorInternal;
+
+namespace DUCK.Forms.Editor
+{
+    [CanEditMultipleObjects]
+    [CustomEditor(typeof(SelectableFocusSwitcher))]
+    public class SelectableFocusSwitcherEditor : UnityEditor.Editor
+    {
+        private SerializedProperty autoDetectSelectables;
+        private SerializedProperty selectables;
+        private ReorderableList list;
+
+        void OnEnable()
+        {
+            selectables = serializedObject.FindProperty("selectables");
+            list = new ReorderableList(serializedObject, selectables, true, true, true, true);
+            autoDetectSelectables = serializedObject.FindProperty("autoDetectSelectables");
+            list.drawElementCallback = DrawListItems;
+            list.drawHeaderCallback = DrawHeader;
+        }
+
+        public override void OnInspectorGUI()
+        {
+            serializedObject.Update();
+            autoDetectSelectables.boolValue = EditorGUILayout.Toggle("Auto Detect", autoDetectSelectables.boolValue);
+            list.DoLayoutList();
+            serializedObject.ApplyModifiedProperties();
+
+            SelectableFocusSwitcher myScript = (SelectableFocusSwitcher) target;
+            if (!autoDetectSelectables.boolValue)
+            {
+                if (GUILayout.Button("Detect Selectables"))
+                {
+                    myScript.FindSelectablesInScene();
+                }
+            }
+        }
+
+        void DrawListItems(Rect rect, int index, bool isActive, bool isFocused)
+        {
+            SerializedProperty element = list.serializedProperty.GetArrayElementAtIndex(index);
+            EditorGUI.PropertyField(new Rect(20, rect.y, rect.width, EditorGUIUtility.singleLineHeight), element);
+        }
+
+        void DrawHeader(Rect rect)
+        {
+            string name = "Selectables";
+            EditorGUI.LabelField(rect, name);
+        }
+    }
+}

Scripts/SelectableFocusSwitcher.cs

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+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.EventSystems;
+using UnityEngine.UI;
+
+ namespace DUCK.Forms
+ {
+     public class SelectableFocusSwitcher : MonoBehaviour
+     {
+         [Tooltip("Will add all active selectable UI elements to the list on awake, you cannot decide the order.")]
+         [SerializeField]
+         public bool autoDetectSelectables = false;
+
+         [Tooltip("Customise the order of which selectables will be focused on pressing tab.")] [SerializeField]
+         private List<Selectable> selectables;
+         private EventSystem eventSystem;
+
+         void Awake()
+         {
+             if(selectables == null){
+             selectables = new List<Selectable>();
+             }
+             eventSystem = FindObjectOfType<EventSystem>();
+
+             if (autoDetectSelectables)
+             {
+                 FindActiveSelectionIndex();
+             }
+         }
+
+         public void FindSelectablesInScene()
+         {
+             Selectable[] sceneSelectables = FindObjectsOfType<Selectable>();
+             for (int i = 0; i < sceneSelectables.Length; i++)
+             {
+                 AddSelectable(sceneSelectables[i]);
+             }
+         }
+
+         public void AddSelectable(Selectable selectable)
+         {
+             if (!selectables.Contains(selectable))
+             {
+                 selectables.Add(selectable);
+             }
+         }
+
+         void Update()
+         {
+             if (Input.GetKeyDown(KeyCode.Tab))
+             {
+                 OnTab();
+             }
+         }
+
+         private void OnTab()
+         {
+             int selectionIndex = FindActiveSelectionIndex();
+             CleanDestroyedObjects();
+             if (autoDetectSelectables)
+             {
+                 FindSelectablesInScene();
+             }
+
+             if (selectionIndex < selectables.Count - 1)
+             {
+                 selectionIndex++;
+             }
+             else
+             {
+                 selectionIndex = 0;
+             }
+
+             if (selectables.Count > 0)
+             {
+                 SwitchSelectableFocus(selectionIndex);
+             }
+         }
+
+         private void SwitchSelectableFocus(int index)
+         {
+             eventSystem.SetSelectedGameObject(selectables[index].gameObject);
+         }
+
+         private int FindActiveSelectionIndex()
+         {
+             GameObject highlightedObject = eventSystem.currentSelectedGameObject;
+             for (int i = 0; i < selectables.Count; i++)
+             {
+                 if (highlightedObject == selectables[i].gameObject) return i;
+             }
+
+             return -1;
+         }
+
+         private void CleanDestroyedObjects()
+         {
+             for (int i = selectables.Count - 1; i >= 0; i--)
+             {
+                 if (selectables[i] == null || selectables[i].gameObject == null)
+                     selectables.Remove(selectables[i]);
+             }
+         }
+     }
+ }

Tests/Duck.Forms.Tests.asmdef

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+{
+    "name": "Duck.Forms.Tests",
+    "references": [
+        "GUID:3ccb158d1f7a14482916322a7272767a"
+    ],
+    "optionalUnityReferences": [
+        "TestAssemblies"
+    ],
+    "includePlatforms": [
+        "Editor"
+    ],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": false,
+    "defineConstraints": [],
+    "versionDefines": []
+}