Merge branch 'tz-lazy-load-cropper' into 'master'

Lazy loading of cropper css

See merge request gitlab-org/gitlab!44137

app/assets/javascripts/lib/utils/css_utils.js

+export function loadCSSFile(path) {
+  return new Promise(resolve => {
+    if (document.querySelector(`link[href="${path}"]`)) {
+      resolve();
+    } else {
+      const linkElement = document.createElement('link');
+      linkElement.type = 'text/css';
+      linkElement.rel = 'stylesheet';
+      // eslint-disable-next-line @gitlab/require-i18n-strings
+      linkElement.media = 'screen,print';
+      linkElement.onload = () => {
+        resolve();
+      };
+      linkElement.href = path;
+
+      document.head.appendChild(linkElement);
+    }
+  });
+}

app/assets/javascripts/profile/gl_crop.js

@@ -3,6 +3,7 @@
 import $ from 'jquery';
 import 'cropper';
 import { isString } from 'lodash';
+import { loadCSSFile } from '../lib/utils/css_utils';
 
 (() => {
   // Matches everything but the file name
@@ -180,6 +181,9 @@ import { isString } from 'lodash';
     }
   }
 
+  const cropModal = document.querySelector('.modal-profile-crop');
+  if (cropModal) loadCSSFile(cropModal.dataset.cropperCssPath);
+
   $.fn.glCrop = function(opts) {
     return this.each(function() {
       return $(this).data('glcrop', new GitLabCrop(this, opts));

app/assets/stylesheets/application.scss

@@ -6,7 +6,6 @@
 @import '@gitlab/at.js/dist/css/jquery.atwho';
 @import 'dropzone/dist/basic';
 @import 'select2';
-@import 'cropper';
 
 // GitLab UI framework
 @import 'framework';

app/assets/stylesheets/lazy_bundles/cropper.css

+/*!
+ * Cropper v2.3.0
+ * https://github.com/fengyuanchen/cropper
+ *
+ * Copyright (c) 2014-2016 Fengyuan Chen and contributors
+ * Released under the MIT license
+ *
+ * Date: 2016-02-22T02:13:13.332Z
+ */
+.cropper-container {
+  font-size: 0;
+  line-height: 0;
+
+  position: relative;
+
+  -webkit-user-select: none;
+  -moz-user-select: none;
+  -ms-user-select: none;
+  user-select: none;
+
+  direction: ltr !important;
+  touch-action: none;
+  -webkit-tap-highlight-color: transparent;
+  -webkit-touch-callout: none;
+}
+
+.cropper-container img {
+  display: block;
+
+  width: 100%;
+  min-width: 0 !important;
+  max-width: none !important;
+  height: 100%;
+  min-height: 0 !important;
+  max-height: none !important;
+
+  image-orientation: 0deg !important;
+}
+
+.cropper-wrap-box,
+.cropper-canvas,
+.cropper-drag-box,
+.cropper-crop-box,
+.cropper-modal {
+  position: absolute;
+  top: 0;
+  right: 0;
+  bottom: 0;
+  left: 0;
+}
+
+.cropper-wrap-box {
+  overflow: hidden;
+}
+
+.cropper-drag-box {
+  opacity: 0;
+  background-color: #fff;
+
+  filter: alpha(opacity=0);
+}
+
+.cropper-modal {
+  opacity: 0.5;
+  background-color: #000;
+
+  filter: alpha(opacity=50);
+}
+
+.cropper-view-box {
+  display: block;
+  overflow: hidden;
+
+  width: 100%;
+  height: 100%;
+
+  outline: 1px solid #39f;
+  outline-color: rgba(51, 153, 255, 0.75);
+}
+
+.cropper-dashed {
+  position: absolute;
+
+  display: block;
+
+  opacity: 0.5;
+  border: 0 dashed #eee;
+
+  filter: alpha(opacity=50);
+}
+
+.cropper-dashed.dashed-h {
+  top: 33.33333%;
+  left: 0;
+
+  width: 100%;
+  height: 33.33333%;
+
+  border-top-width: 1px;
+  border-bottom-width: 1px;
+}
+
+.cropper-dashed.dashed-v {
+  top: 0;
+  left: 33.33333%;
+
+  width: 33.33333%;
+  height: 100%;
+
+  border-right-width: 1px;
+  border-left-width: 1px;
+}
+
+.cropper-center {
+  position: absolute;
+  top: 50%;
+  left: 50%;
+
+  display: block;
+
+  width: 0;
+  height: 0;
+
+  opacity: 0.75;
+
+  filter: alpha(opacity=75);
+}
+
+.cropper-center::before,
+.cropper-center::after {
+  position: absolute;
+
+  display: block;
+
+  content: ' ';
+
+  background-color: #eee;
+}
+
+.cropper-center::before {
+  top: 0;
+  left: -3px;
+
+  width: 7px;
+  height: 1px;
+}
+
+.cropper-center::after {
+  top: -3px;
+  left: 0;
+
+  width: 1px;
+  height: 7px;
+}
+
+.cropper-face,
+.cropper-line,
+.cropper-point {
+  position: absolute;
+
+  display: block;
+
+  width: 100%;
+  height: 100%;
+
+  opacity: 0.1;
+
+  filter: alpha(opacity=10);
+}
+
+.cropper-face {
+  top: 0;
+  left: 0;
+
+  background-color: #fff;
+}
+
+.cropper-line {
+  background-color: #39f;
+}
+
+.cropper-line.line-e {
+  top: 0;
+  right: -3px;
+
+  width: 5px;
+
+  cursor: e-resize;
+}
+
+.cropper-line.line-n {
+  top: -3px;
+  left: 0;
+
+  height: 5px;
+
+  cursor: n-resize;
+}
+
+.cropper-line.line-w {
+  top: 0;
+  left: -3px;
+
+  width: 5px;
+
+  cursor: w-resize;
+}
+
+.cropper-line.line-s {
+  bottom: -3px;
+  left: 0;
+
+  height: 5px;
+
+  cursor: s-resize;
+}
+
+.cropper-point {
+  width: 5px;
+  height: 5px;
+
+  opacity: 0.75;
+  background-color: #39f;
+
+  filter: alpha(opacity=75);
+}
+
+.cropper-point.point-e {
+  top: 50%;
+  right: -3px;
+
+  margin-top: -3px;
+
+  cursor: e-resize;
+}
+
+.cropper-point.point-n {
+  top: -3px;
+  left: 50%;
+
+  margin-left: -3px;
+
+  cursor: n-resize;
+}
+
+.cropper-point.point-w {
+  top: 50%;
+  left: -3px;
+
+  margin-top: -3px;
+
+  cursor: w-resize;
+}
+
+.cropper-point.point-s {
+  bottom: -3px;
+  left: 50%;
+
+  margin-left: -3px;
+
+  cursor: s-resize;
+}
+
+.cropper-point.point-ne {
+  top: -3px;
+  right: -3px;
+
+  cursor: ne-resize;
+}
+
+.cropper-point.point-nw {
+  top: -3px;
+  left: -3px;
+
+  cursor: nw-resize;
+}
+
+.cropper-point.point-sw {
+  bottom: -3px;
+  left: -3px;
+
+  cursor: sw-resize;
+}
+
+.cropper-point.point-se {
+  right: -3px;
+  bottom: -3px;
+
+  width: 20px;
+  height: 20px;
+
+  cursor: se-resize;
+
+  opacity: 1;
+
+  filter: alpha(opacity=100);
+}
+
+.cropper-point.point-se::before {
+  position: absolute;
+  right: -50%;
+  bottom: -50%;
+
+  display: block;
+
+  width: 200%;
+  height: 200%;
+
+  content: ' ';
+
+  opacity: 0;
+  background-color: #39f;
+
+  filter: alpha(opacity=0);
+}
+
+@media (min-width: 768px) {
+  .cropper-point.point-se {
+    width: 15px;
+    height: 15px;
+  }
+}
+
+@media (min-width: 992px) {
+  .cropper-point.point-se {
+    width: 10px;
+    height: 10px;
+  }
+}
+
+@media (min-width: 1200px) {
+  .cropper-point.point-se {
+    width: 5px;
+    height: 5px;
+
+    opacity: 0.75;
+
+    filter: alpha(opacity=75);
+  }
+}
+
+.cropper-invisible {
+  opacity: 0;
+
+  filter: alpha(opacity=0);
+}
+
+.cropper-bg {
+  background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQAQMAAAAlPW0iAAAAA3NCSVQICAjb4U/gAAAABlBMVEXMzMz////TjRV2AAAACXBIWXMAAArrAAAK6wGCiw1aAAAAHHRFWHRTb2Z0d2FyZQBBZG9iZSBGaXJld29ya3MgQ1M26LyyjAAAABFJREFUCJlj+M/AgBVhF/0PAH6/D/HkDxOGAAAAAElFTkSuQmCC');
+}
+
+.cropper-hide {
+  position: absolute;
+
+  display: block;
+
+  width: 0;
+  height: 0;
+}
+
+.cropper-hidden {
+  display: none !important;
+}
+
+.cropper-move {
+  cursor: move;
+}
+
+.cropper-crop {
+  cursor: crosshair;
+}
+
+.cropper-disabled .cropper-drag-box,
+.cropper-disabled .cropper-face,
+.cropper-disabled .cropper-line,
+.cropper-disabled .cropper-point {
+  cursor: not-allowed;
+}

app/views/profiles/show.html.haml

@@ -122,7 +122,7 @@
         = f.submit s_("Profiles|Update profile settings"), class: 'btn btn-success'
         = link_to _("Cancel"), user_path(current_user), class: 'btn btn-cancel'
 
-.modal.modal-profile-crop
+.modal.modal-profile-crop{ data: { cropper_css_path: ActionController::Base.helpers.stylesheet_path('lazy_bundles/cropper.css') } }
   .modal-dialog
     .modal-content
       .modal-header

changelogs/unreleased/tz-lazy-load-cropper.yml

+---
+title: Loads cropper css only when needed
+merge_request: 44137
+author:
+type: performance

config/application.rb

@@ -194,6 +194,7 @@ module Gitlab
     config.assets.precompile << "page_bundles/milestone.css"
     config.assets.precompile << "page_bundles/todos.css"
     config.assets.precompile << "page_bundles/xterm.css"
+    config.assets.precompile << "lazy_bundles/cropper.css"
     config.assets.precompile << "performance_bar.css"
     config.assets.precompile << "lib/ace.js"
     config.assets.precompile << "disable_animations.css"