Final adjustments on quickSwitch

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

@@ -26,3 +26,45 @@ OHIF.ui.getOffset = element => {
         top
     };
 };
+
+/**
+ * Get the vertical and horizontal scrollbar sizes
+ * Got from https://stackoverflow.com/questions/986937/how-can-i-get-the-browsers-scrollbar-sizes
+ *
+ * @returns {Array} Array containing the scrollbar horizontal and vertical sizes
+ */
+OHIF.ui.getScrollbarSize = () => {
+    const inner = document.createElement('p');
+    inner.style.width = '100%';
+    inner.style.height = '100%';
+
+    const outer = document.createElement('div');
+    outer.style.position = 'absolute';
+    outer.style.top = '0px';
+    outer.style.left = '0px';
+    outer.style.visibility = 'hidden';
+    outer.style.width = '100px';
+    outer.style.height = '100px';
+    outer.style.overflow = 'hidden';
+    outer.appendChild(inner);
+
+    document.body.appendChild(outer);
+
+    const w1 = inner.offsetWidth;
+    const h1 = inner.offsetHeight;
+    outer.style.overflow = 'scroll';
+    let w2 = inner.offsetWidth;
+    let h2 = inner.offsetHeight;
+
+    if (w1 === w2) {
+        w2 = outer.clientWidth;
+    }
+
+    if (h1 === h2) {
+        h2 = outer.clientHeight;
+    }
+
+    document.body.removeChild(outer);
+
+    return [(w1 - w2), (h1 - h2)];
+};