1 files changed, 31 insertions, 0 deletions
diff --git a/src/services/offset_finder/offset_finder.service.js b/src/services/offset_finder/offset_finder.service.js
new file mode 100644
index 00000000..9034f8c8
--- /dev/null
+++ b/src/services/offset_finder/offset_finder.service.js
@@ -0,0 +1,31 @@
+export const findOffset = (child, parent, { top = 0, left = 0 } = {}, ignorePadding = true) => {
+  const result = {
+    top: top + child.offsetTop,
+    left: left + child.offsetLeft
+  }
+  if (!ignorePadding && child !== window) {
+    const { topPadding, leftPadding } = findPadding(child)
+    result.top += ignorePadding ? 0 : topPadding
+    result.left += ignorePadding ? 0 : leftPadding
+  }
+
+  if (child.offsetParent && (parent === window || parent.contains(child.offsetParent) || parent === child.offsetParent)) {
+    return findOffset(child.offsetParent, parent, result, false)
+  } else {
+    if (parent !== window) {
+      const { topPadding, leftPadding } = findPadding(parent)
+      result.top += topPadding
+      result.left += leftPadding
+    }
+    return result
+  }
+}
+
+const findPadding = (el) => {
+  const topPaddingStr = window.getComputedStyle(el)['padding-top']
+  const topPadding = Number(topPaddingStr.substring(0, topPaddingStr.length - 2))
+  const leftPaddingStr = window.getComputedStyle(el)['padding-left']
+  const leftPadding = Number(leftPaddingStr.substring(0, leftPaddingStr.length - 2))
+
+  return { topPadding, leftPadding }
+}