Implement Item#layer.

src/item/Item.js

@@ -441,7 +441,20 @@ var Item = this.Item = Base.extend(/** @lends Item# */{
 		}
 	},
 
-	// TODO: #getLayer()
+	/**
+	 * The layer that this item is contained within.
+	 *
+	 * @type Layer
+	 * @bean
+	 */
+	getLayer: function() {
+		var parent = this;
+		while (parent = parent._parent) {
+			if (parent instanceof Layer)
+				return parent;
+		}
+		return null;
+	},
 
 	/**
 	 * The item that this item is contained within.
@@ -681,8 +694,6 @@ var Item = this.Item = Base.extend(/** @lends Item# */{
 		return raster;
 	},
 
-
-
 	/**
 	 * Perform a hit test on the item (and its children, if it is a
 	 * {@link Group} or {@link Layer}) at the location of the specified point.

test/tests/Item.js

@@ -67,18 +67,24 @@ test('addChild(item)', function() {
 	},  1);
 });
 
-test('item.parent / item.isChild / item.isParent', function() {
+test('item.parent / item.isChild / item.isParent / item.layer', function() {
 	var project = paper.project;
 	var secondDoc = new Project();
 	var path = new Path();
 	project.activeLayer.addChild(path);
 	equals(function() {
 		return project.activeLayer.children.indexOf(path) != -1;
+	}, true);
+		equals(function() {
+		return path.layer == project.activeLayer;
 	}, true);
 	secondDoc.activeLayer.addChild(path);
 	equals(function() {
 		return project.activeLayer.isChild(path);
 	}, false);
+	equals(function() {
+		return path.layer == secondDoc.activeLayer;
+	}, true);
 	equals(function() {
 		return path.isParent(project.activeLayer);
 	}, false);