From 399e1e83c038685f15bf3049382a16c6ccb8fa37 Mon Sep 17 00:00:00 2001
From: Paul Slaughter <pslaughter@gitlab.com>
Date: Fri, 1 Jun 2018 16:24:56 +0000
Subject: Update position sticky polyfill

---
 app/assets/javascripts/init_changes_dropdown.js |  6 +-
 app/assets/javascripts/job.js                   |  7 ---
 app/assets/javascripts/lib/utils/sticky.js      | 39 ------------
 spec/javascripts/lib/utils/sticky_spec.js       | 79 -------------------------
 4 files changed, 3 insertions(+), 128 deletions(-)
 delete mode 100644 app/assets/javascripts/lib/utils/sticky.js
 delete mode 100644 spec/javascripts/lib/utils/sticky_spec.js

diff --git a/app/assets/javascripts/init_changes_dropdown.js b/app/assets/javascripts/init_changes_dropdown.js
index 09cca1dc7d9..a9f4829f980 100644
--- a/app/assets/javascripts/init_changes_dropdown.js
+++ b/app/assets/javascripts/init_changes_dropdown.js
@@ -1,8 +1,8 @@
 import $ from 'jquery';
-import stickyMonitor from './lib/utils/sticky';
+import StickyFill from 'stickyfilljs';
 
-export default (stickyTop) => {
-  stickyMonitor(document.querySelector('.js-diff-files-changed'), stickyTop);
+export default () => {
+  StickyFill.add(document.querySelector('.js-diff-files-changed'));
 
   $('.js-diff-stats-dropdown').glDropdown({
     filterable: true,
diff --git a/app/assets/javascripts/job.js b/app/assets/javascripts/job.js
index 611e8200b4d..8dfe8aae5b5 100644
--- a/app/assets/javascripts/job.js
+++ b/app/assets/javascripts/job.js
@@ -80,13 +80,6 @@ export default class Job {
   }
 
   initAffixTopArea() {
-    /**
-      If the browser does not support position sticky, it returns the position as static.
-      If the browser does support sticky, then we allow the browser to handle it, if not
-      then we use a polyfill
-    */
-    if (this.$topBar.css('position') !== 'static') return;
-
     StickyFill.add(this.$topBar);
   }
 
diff --git a/app/assets/javascripts/lib/utils/sticky.js b/app/assets/javascripts/lib/utils/sticky.js
deleted file mode 100644
index 098afcfa1b4..00000000000
--- a/app/assets/javascripts/lib/utils/sticky.js
+++ /dev/null
@@ -1,39 +0,0 @@
-export const createPlaceholder = () => {
-  const placeholder = document.createElement('div');
-  placeholder.classList.add('sticky-placeholder');
-
-  return placeholder;
-};
-
-export const isSticky = (el, scrollY, stickyTop, insertPlaceholder) => {
-  const top = Math.floor(el.offsetTop - scrollY);
-
-  if (top <= stickyTop && !el.classList.contains('is-stuck')) {
-    const placeholder = insertPlaceholder ? createPlaceholder() : null;
-    const heightBefore = el.offsetHeight;
-
-    el.classList.add('is-stuck');
-
-    if (insertPlaceholder) {
-      el.parentNode.insertBefore(placeholder, el.nextElementSibling);
-
-      placeholder.style.height = `${heightBefore - el.offsetHeight}px`;
-    }
-  } else if (top > stickyTop && el.classList.contains('is-stuck')) {
-    el.classList.remove('is-stuck');
-
-    if (insertPlaceholder && el.nextElementSibling && el.nextElementSibling.classList.contains('sticky-placeholder')) {
-      el.nextElementSibling.remove();
-    }
-  }
-};
-
-export default (el, stickyTop, insertPlaceholder = true) => {
-  if (!el) return;
-
-  if (typeof CSS === 'undefined' || !(CSS.supports('(position: -webkit-sticky) or (position: sticky)'))) return;
-
-  document.addEventListener('scroll', () => isSticky(el, window.scrollY, stickyTop, insertPlaceholder), {
-    passive: true,
-  });
-};
diff --git a/spec/javascripts/lib/utils/sticky_spec.js b/spec/javascripts/lib/utils/sticky_spec.js
deleted file mode 100644
index b87c836654d..00000000000
--- a/spec/javascripts/lib/utils/sticky_spec.js
+++ /dev/null
@@ -1,79 +0,0 @@
-import { isSticky } from '~/lib/utils/sticky';
-
-describe('sticky', () => {
-  let el;
-
-  beforeEach(() => {
-    document.body.innerHTML += `
-      <div class="parent">
-        <div id="js-sticky"></div>
-      </div>
-    `;
-
-    el = document.getElementById('js-sticky');
-  });
-
-  afterEach(() => {
-    el.parentNode.remove();
-  });
-
-  describe('when stuck', () => {
-    it('does not remove is-stuck class', () => {
-      isSticky(el, 0, el.offsetTop);
-      isSticky(el, 0, el.offsetTop);
-
-      expect(
-        el.classList.contains('is-stuck'),
-      ).toBeTruthy();
-    });
-
-    it('adds is-stuck class', () => {
-      isSticky(el, 0, el.offsetTop);
-
-      expect(
-        el.classList.contains('is-stuck'),
-      ).toBeTruthy();
-    });
-
-    it('inserts placeholder element', () => {
-      isSticky(el, 0, el.offsetTop, true);
-
-      expect(
-        document.querySelector('.sticky-placeholder'),
-      ).not.toBeNull();
-    });
-  });
-
-  describe('when not stuck', () => {
-    it('removes is-stuck class', () => {
-      spyOn(el.classList, 'remove').and.callThrough();
-
-      isSticky(el, 0, el.offsetTop);
-      isSticky(el, 0, 0);
-
-      expect(
-        el.classList.remove,
-      ).toHaveBeenCalledWith('is-stuck');
-      expect(
-        el.classList.contains('is-stuck'),
-      ).toBeFalsy();
-    });
-
-    it('does not add is-stuck class', () => {
-      isSticky(el, 0, 0);
-
-      expect(
-        el.classList.contains('is-stuck'),
-      ).toBeFalsy();
-    });
-
-    it('removes placeholder', () => {
-      isSticky(el, 0, el.offsetTop, true);
-      isSticky(el, 0, 0, true);
-
-      expect(
-        document.querySelector('.sticky-placeholder'),
-      ).toBeNull();
-    });
-  });
-});
-- 
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