PurchaseScreen Analytics: Record with new format

lib/analytics.dart

@@ -31,6 +31,8 @@ enum Event {
   DrawerFeedback,
   DrawerBugReport,
   DrawerSettings,
+
+  PurchaseScreenOpen,
 }
 
 String _eventToString(Event e) {
@@ -75,6 +77,9 @@ String _eventToString(Event e) {
       return "drawer_bugreport";
     case Event.DrawerSettings:
       return "drawer_settings";
+
+    case Event.PurchaseScreenOpen:
+      return "purchase_screen_open";
   }
 
   return "unknown_event";

lib/widgets/app_drawer.dart

@@ -60,8 +60,9 @@ class AppDrawer extends StatelessWidget {
                 Navigator.pop(context);
                 Navigator.pushNamed(context, "/purchase");
 
-                getAnalytics().logEvent(
-                  name: "purchase_screen_open",
+                logEvent(
+                  Event.PurchaseScreenOpen,
+                  parameters: {"from": "drawer"},
                 );
               },
             ),