The Layer Game Object has been given all of the missing properties and methods from Game Object to make the class shapes identical. This includes the properties parentContainer, tabIndex, input and body. You cannot set any of these properties, they are ignored by the Layer itself. It also includes the methods: setInteractive, disableInteractive and removeInteractive. A Layer cannot be enabled for input or have a physics body. Fix phaserjs#5459

Author: photonstorm

src/gameobjects/layer/Layer.js

@@ -152,6 +152,18 @@ var Layer = new Class({
          */
         this.state = 0;
 
+        /**
+         * A Layer cannot be placed inside a Container.
+         *
+         * This property is kept purely so a Layer has the same
+         * shape as a Game Object.
+         *
+         * @name Phaser.GameObjects.Layer#parentContainer
+         * @type {Phaser.GameObjects.Container}
+         * @since 3.51.0
+         */
+        this.parentContainer = null;
+
         /**
          * The name of this Game Object.
          * Empty by default and never populated by Phaser, this is left for developers to use.
@@ -175,6 +187,17 @@ var Layer = new Class({
          */
         this.active = true;
 
+        /**
+         * The Tab Index of the Game Object.
+         * Reserved for future use by plugins and the Input Manager.
+         *
+         * @name Phaser.GameObjects.Layer#tabIndex
+         * @type {number}
+         * @default -1
+         * @since 3.51.0
+         */
+        this.tabIndex = -1;
+
         /**
          * A Data Manager.
          * It allows you to store, query and get key/value paired information specific to this Game Object.
@@ -214,6 +237,28 @@ var Layer = new Class({
          */
         this.cameraFilter = 0;
 
+        /**
+         * This property is kept purely so a Layer has the same
+         * shape as a Game Object. You cannot input enable a Layer.
+         *
+         * @name Phaser.GameObjects.Layer#input
+         * @type {?Phaser.Types.Input.InteractiveObject}
+         * @default null
+         * @since 3.51.0
+         */
+        this.input = null;
+
+        /**
+         * This property is kept purely so a Layer has the same
+         * shape as a Game Object. You cannot give a Layer a physics body.
+         *
+         * @name Phaser.GameObjects.Layer#body
+         * @type {?(Phaser.Physics.Arcade.Body|Phaser.Physics.Arcade.StaticBody|MatterJS.BodyType)}
+         * @default null
+         * @since 3.51.0
+         */
+        this.body = null;
+
         /**
          * This Game Object will ignore all calls made to its destroy method if this flag is set to `true`.
          * This includes calls that may come from a Group, Container or the Scene itself.
@@ -511,6 +556,54 @@ var Layer = new Class({
         return this.data.get(key);
     },
 
+    /**
+     * A Layer cannot be enabled for input.
+     *
+     * This method does nothing and is kept to ensure
+     * the Layer has the same shape as a Game Object.
+     *
+     * @method Phaser.GameObjects.Layer#setInteractive
+     * @since 3.51.0
+     *
+     * @return {this} This GameObject.
+     */
+    setInteractive: function ()
+    {
+        return this;
+    },
+
+    /**
+     * A Layer cannot be enabled for input.
+     *
+     * This method does nothing and is kept to ensure
+     * the Layer has the same shape as a Game Object.
+     *
+     * @method Phaser.GameObjects.Layer#disableInteractive
+     * @since 3.51.0
+     *
+     * @return {this} This GameObject.
+     */
+    disableInteractive: function ()
+    {
+        return this;
+    },
+
+    /**
+     * A Layer cannot be enabled for input.
+     *
+     * This method does nothing and is kept to ensure
+     * the Layer has the same shape as a Game Object.
+     *
+     * @method Phaser.GameObjects.Layer#removeInteractive
+     * @since 3.51.0
+     *
+     * @return {this} This GameObject.
+     */
+    removeInteractive: function ()
+    {
+        return this;
+    },
+
     /**
      * This callback is invoked when this Game Object is added to a Scene.
      *
@@ -582,6 +675,48 @@ var Layer = new Class({
         return !(this.renderFlags !== 15 || this.list.length === 0 || (this.cameraFilter !== 0 && (this.cameraFilter & camera.id)));
     },
 
+    /**
+     * Returns an array containing the display list index of either this Game Object, or if it has one,
+     * its parent Container. It then iterates up through all of the parent containers until it hits the
+     * root of the display list (which is index 0 in the returned array).
+     *
+     * Used internally by the InputPlugin but also useful if you wish to find out the display depth of
+     * this Game Object and all of its ancestors.
+     *
+     * @method Phaser.GameObjects.Layer#getIndexList
+     * @since 3.51.0
+     *
+     * @return {number[]} An array of display list position indexes.
+     */
+    getIndexList: function ()
+    {
+        // eslint-disable-next-line consistent-this
+        var child = this;
+        var parent = this.parentContainer;
+
+        var indexes = [];
+
+        while (parent)
+        {
+            indexes.unshift(parent.getIndex(child));
+
+            child = parent;
+
+            if (!parent.parentContainer)
+            {
+                break;
+            }
+            else
+            {
+                parent = parent.parentContainer;
+            }
+        }
+
+        indexes.unshift(this.displayList.getIndex(child));
+
+        return indexes;
+    },
+
     /**
      * Internal method called from `List.addCallback`.
      *