Fixing multi-level dropdown issues with window boundaries

Packages/ohif-core/client/lib/ui.js

@@ -4,3 +4,25 @@ import { Meteor } from 'meteor/meteor';
 // Get the UI settings
 const ui = Meteor.settings && Meteor.settings.public && Meteor.settings.public.ui;
 OHIF.uiSettings = ui || {};
+
+/**
+ * Get the offset for the given element
+ *
+ * @param {Object} element DOM element which will have the offser calculated
+ * @returns {Object} Object containing the top and left offset
+ */
+OHIF.ui.getOffset = element => {
+    let top = 0;
+    let left = 0;
+    if (element.offsetParent) {
+        do {
+            left += element.offsetLeft;
+            top += element.offsetTop;
+        } while (element = element.offsetParent);
+    }
+
+    return {
+        left,
+        top
+    };
+};