diff --git a/CartActionEvent.php b/CartActionEvent.php
new file mode 100644
index 0000000..bbd4ac8
--- /dev/null
+++ b/CartActionEvent.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace yz\shoppingcart;
+use yii\base\Event;
+
+
+/**
+ * Class CartActionEvent
+ */
+class CartActionEvent extends Event
+{
+    const ACTION_UPDATE = 'update';
+    const ACTION_POSITION_PUT = 'positionPut';
+    const ACTION_BEFORE_REMOVE = 'beforeRemove';
+    const ACTION_REMOVE_ALL = 'removeAll';
+    const ACTION_SET_POSITIONS = 'setPositions';
+
+    /**
+     * Name of the action taken on the cart
+     * @var string
+     */
+    public $action;
+    /**
+     * Position of the cart that was affected. Could be null if action deals with all positions of the cart
+     * @var CartPositionInterface
+     */
+    public $position;
+}
\ No newline at end of file
diff --git a/ShoppingCart.php b/ShoppingCart.php
index b3024fa..40fb8f4 100644
--- a/ShoppingCart.php
+++ b/ShoppingCart.php
@@ -101,11 +101,13 @@ public function put($position, $quantity = 1)
             $position->setQuantity($quantity);
             $this->_positions[$position->getId()] = $position;
         }
-        $this->trigger(self::EVENT_POSITION_PUT, new Event([
-            'data' => $this->_positions[$position->getId()],
+        $this->trigger(self::EVENT_POSITION_PUT, new CartActionEvent([
+            'action' => CartActionEvent::ACTION_POSITION_PUT,
+            'position' => $this->_positions[$position->getId()],
         ]));
-        $this->trigger(self::EVENT_CART_CHANGE, new Event([
-            'data' => ['action' => 'put', 'position' => $this->_positions[$position->getId()]],
+        $this->trigger(self::EVENT_CART_CHANGE, new CartActionEvent([
+            'action' => CartActionEvent::ACTION_POSITION_PUT,
+            'position' => $this->_positions[$position->getId()],
         ]));
         if ($this->storeInSession)
             $this->saveToSession();
@@ -137,11 +139,13 @@ public function update($position, $quantity)
             $position->setQuantity($quantity);
             $this->_positions[$position->getId()] = $position;
         }
-        $this->trigger(self::EVENT_POSITION_UPDATE, new Event([
-            'data' => $this->_positions[$position->getId()],
+        $this->trigger(self::EVENT_POSITION_UPDATE, new CartActionEvent([
+            'action' => CartActionEvent::ACTION_UPDATE,
+            'position' => $this->_positions[$position->getId()],
         ]));
-        $this->trigger(self::EVENT_CART_CHANGE, new Event([
-            'data' => ['action' => 'update', 'position' => $this->_positions[$position->getId()]],
+        $this->trigger(self::EVENT_CART_CHANGE, new CartActionEvent([
+            'action' => CartActionEvent::ACTION_UPDATE,
+            'position' => $this->_positions[$position->getId()],
         ]));
         if ($this->storeInSession)
             $this->saveToSession();
@@ -162,11 +166,13 @@ public function remove($position)
      */
     public function removeById($id)
     {
-        $this->trigger(self::EVENT_BEFORE_POSITION_REMOVE, new Event([
-            'data' => $this->_positions[$id],
+        $this->trigger(self::EVENT_BEFORE_POSITION_REMOVE, new CartActionEvent([
+            'action' => CartActionEvent::ACTION_BEFORE_REMOVE,
+            'position' => $this->_positions[$id],
         ]));
-        $this->trigger(self::EVENT_CART_CHANGE, new Event([
-            'data' => ['action' => 'remove', 'position' => $this->_positions[$id]],
+        $this->trigger(self::EVENT_CART_CHANGE, new CartActionEvent([
+            'action' => CartActionEvent::ACTION_BEFORE_REMOVE,
+            'position' => $this->_positions[$id],
         ]));
         unset($this->_positions[$id]);
         if ($this->storeInSession)
@@ -179,8 +185,8 @@ public function removeById($id)
     public function removeAll()
     {
         $this->_positions = [];
-        $this->trigger(self::EVENT_CART_CHANGE, new Event([
-            'data' => ['action' => 'removeAll'],
+        $this->trigger(self::EVENT_CART_CHANGE, new CartActionEvent([
+            'action' => CartActionEvent::ACTION_REMOVE_ALL,
         ]));
         if ($this->storeInSession)
             $this->saveToSession();
@@ -223,8 +229,8 @@ public function getPositions()
     public function setPositions($positions)
     {
         $this->_positions = $positions;
-        $this->trigger(self::EVENT_CART_CHANGE, new Event([
-            'data' => ['action' => 'positions'],
+        $this->trigger(self::EVENT_CART_CHANGE, new CartActionEvent([
+            'action' => CartActionEvent::ACTION_SET_POSITIONS,
         ]));
         if ($this->storeInSession)
             $this->saveToSession();