1 files changed, 45 insertions, 0 deletions
diff --git a/devtools/client/inspector/boxmodel/reducers/box-model.js b/devtools/client/inspector/boxmodel/reducers/box-model.js
new file mode 100644
index 0000000000..ea3863e56a
--- /dev/null
+++ b/devtools/client/inspector/boxmodel/reducers/box-model.js
@@ -0,0 +1,45 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const {
+  UPDATE_GEOMETRY_EDITOR_ENABLED,
+  UPDATE_LAYOUT,
+  UPDATE_OFFSET_PARENT,
+} = require("resource://devtools/client/inspector/boxmodel/actions/index.js");
+
+const INITIAL_BOX_MODEL = {
+  geometryEditorEnabled: false,
+  layout: {},
+  offsetParent: null,
+};
+
+const reducers = {
+  [UPDATE_GEOMETRY_EDITOR_ENABLED](boxModel, { enabled }) {
+    return Object.assign({}, boxModel, {
+      geometryEditorEnabled: enabled,
+    });
+  },
+
+  [UPDATE_LAYOUT](boxModel, { layout }) {
+    return Object.assign({}, boxModel, {
+      layout,
+    });
+  },
+
+  [UPDATE_OFFSET_PARENT](boxModel, { offsetParent }) {
+    return Object.assign({}, boxModel, {
+      offsetParent,
+    });
+  },
+};
+
+module.exports = function (boxModel = INITIAL_BOX_MODEL, action) {
+  const reducer = reducers[action.type];
+  if (!reducer) {
+    return boxModel;
+  }
+  return reducer(boxModel, action);
+};