fix(modal): body content shift

- Implements TWBS body padding fix to keep content in an element
with a container class from shifting when the body overflow is
set to hidden with the modal-open class.

Fixes #2631
Closes #5711

Author: RobJacobs

Diff for: src/modal/index.js

@@ -2,6 +2,7 @@ require('../stackedMap');
 require('../../template/modal/backdrop.html.js');
 require('../../template/modal/window.html.js');
 require('./modal');
+require('../position/position.css');
 
 var MODULE_NAME = 'ui.bootstrap.module.modal';
 

Diff for: src/modal/modal.js

@@ -1,4 +1,4 @@
-angular.module('ui.bootstrap.modal', ['ui.bootstrap.stackedMap'])
+angular.module('ui.bootstrap.modal', ['ui.bootstrap.stackedMap', 'ui.bootstrap.position'])
 /**
  * A helper, internal data structure that stores all references attached to key
  */
@@ -247,8 +247,8 @@ angular.module('ui.bootstrap.modal', ['ui.bootstrap.stackedMap'])
   })
 
   .factory('$uibModalStack', ['$animate', '$animateCss', '$document',
-    '$compile', '$rootScope', '$q', '$$multiMap', '$$stackedMap',
-    function($animate, $animateCss, $document, $compile, $rootScope, $q, $$multiMap, $$stackedMap) {
+    '$compile', '$rootScope', '$q', '$$multiMap', '$$stackedMap', '$uibPosition',
+    function($animate, $animateCss, $document, $compile, $rootScope, $q, $$multiMap, $$stackedMap, $uibPosition) {
       var OPENED_MODAL_CLASS = 'modal-open';
 
       var backdropDomEl, backdropScope;
@@ -262,6 +262,7 @@ angular.module('ui.bootstrap.modal', ['ui.bootstrap.stackedMap'])
       var tabableSelector = 'a[href], area[href], input:not([disabled]), ' +
         'button:not([disabled]),select:not([disabled]), textarea:not([disabled]), ' +
         'iframe, object, embed, *[tabindex], *[contenteditable=true]';
+      var scrollbarPadding;
 
       function isVisible(element) {
         return !!(element.offsetWidth ||
@@ -297,6 +298,14 @@ angular.module('ui.bootstrap.modal', ['ui.bootstrap.stackedMap'])
           var modalBodyClass = modalWindow.openedClass || OPENED_MODAL_CLASS;
           openedClasses.remove(modalBodyClass, modalInstance);
           appendToElement.toggleClass(modalBodyClass, openedClasses.hasKey(modalBodyClass));
+          if (scrollbarPadding && scrollbarPadding.heightOverflow && scrollbarPadding.scrollbarWidth) {
+            if (scrollbarPadding.originalRight) {
+              appendToElement.css({paddingRight: scrollbarPadding.originalRight + 'px'});
+            } else {
+              appendToElement.css({paddingRight: ''});
+            }
+            scrollbarPadding = null;
+          }
           toggleTopWindowClass(true);
         }, modalWindow.closedDeferred);
         checkRemoveBackdrop();
@@ -472,12 +481,12 @@ angular.module('ui.bootstrap.modal', ['ui.bootstrap.stackedMap'])
           angularDomEl.attr('modal-animation', 'true');
         }
 
-        $animate.enter($compile(angularDomEl)(modal.scope), appendToElement)
-          .then(function() {
-            if (!modal.scope.$$uibDestructionScheduled) {
-              $animate.addClass(appendToElement, modalBodyClass);
-            }
-          });
+        scrollbarPadding = $uibPosition.scrollbarPadding(appendToElement);
+        if (scrollbarPadding.heightOverflow && scrollbarPadding.scrollbarWidth) {
+          appendToElement.css({paddingRight: scrollbarPadding.right + 'px'});
+        }
+        appendToElement.addClass(modalBodyClass);
+        $animate.enter($compile(angularDomEl)(modal.scope), appendToElement);
 
         openedWindows.top().value.modalDomEl = angularDomEl;
         openedWindows.top().value.modalOpener = modalOpener;

Diff for: src/position/docs/readme.md

@@ -45,15 +45,60 @@ Gets the closest positioned ancestor.
 * _(Type: `element`)_ -
   The closest positioned ancestor.
 
-#### scrollbarWidth()
+#### scrollbarWidth(isBody)
 
 Calculates the browser scrollbar width and caches the result for future calls.  Concept from the TWBS measureScrollbar() function in [modal.js](https://github.com/twbs/bootstrap/blob/master/js/modal.js).
 
+##### parameters
+
+* `isBody`
+  _(Type: `boolean`, Default: `false`, optional)_ - Is the requested scrollbar width for the body/html element.  IE and Edge overlay the scrollbar on the body/html element and should be considered 0.
+
 ##### returns
 
 * _(Type: `number`)_ -
   The width of the browser scrollbar.
 
+#### scrollbarPadding(element)
+
+Calculates the padding required to replace the scrollbar on an element.
+
+##### parameters
+
+* 'element' _(Type: `element`)_ - The element to calculate the padding on (should be a scrollable element).
+
+##### returns
+
+An object with the following properties:
+
+* `scrollbarWidth`
+  _(Type: `number`)_ -
+  The width of the scrollbar.
+
+* `widthOverflow`
+  _(Type: `boolean`)_ -
+  Whether the width is overflowing.
+
+* `right`
+  _(Type: `number`)_ -
+  The total right padding required to replace the scrollbar.
+
+* `originalRight`
+  _(Type: `number`)_ -
+  The oringal right padding on the element.
+
+* `heightOverflow`
+  _(Type: `boolean`)_ -
+  Whether the height is overflowing.
+
+* `bottom`
+  _(Type: `number`)_ -
+  The total bottom padding required to replace the scrollbar.
+
+* `originalBottom`
+  _(Type: `number`)_ -
+  The oringal bottom padding on the element.
+
 #### isScrollable(element, includeHidden)
 
 Determines if an element is scrollable.
@@ -72,7 +117,7 @@ Determines if an element is scrollable.
 * _(Type: `boolean`)_ -
   Whether the element is scrollable.
 
-#### scrollParent(element, includeHidden)
+#### scrollParent(element, includeHidden, includeSelf)
 
 Gets the closest scrollable ancestor.  Concept from the jQueryUI [scrollParent.js](https://github.com/jquery/jquery-ui/blob/master/ui/scroll-parent.js).
 
@@ -85,6 +130,9 @@ Gets the closest scrollable ancestor.  Concept from the jQueryUI [scrollParent.j
 * `includeHidden`
   _(Type: `boolean`, Default: `false`, optional)_ - Should scroll style of 'hidden' be considered.
 
+* `includeSelf`
+  _(Type: `boolean`, Default: `false`, optional)_ - Should the element passed in be included in the scrollable lookup.
+
 ##### returns
 
 * _(Type: `element`)_ -

Diff for: src/position/position.css

@@ -7,9 +7,13 @@
 }
 
 .uib-position-scrollbar-measure {
-  position: absolute;
-  top: -9999px;
-  width: 50px;
-  height: 50px;
-  overflow: scroll;
+  position: absolute !important;
+  top: -9999px !important;
+  width: 50px !important;
+  height: 50px !important;
+  overflow: scroll !important;
+}
+
+.uib-position-body-scrollbar-measure {
+  overflow: scroll !important;
 }

Diff for: src/position/position.js

@@ -12,6 +12,11 @@ angular.module('ui.bootstrap.position', [])
      * Do not access this variable directly, use scrollbarWidth() instead.
      */
     var SCROLLBAR_WIDTH;
+    /**
+     * scrollbar on body and html element in IE and Edge overlay
+     * content and should be considered 0 width.
+     */
+    var BODY_SCROLLBAR_WIDTH;
     var OVERFLOW_REGEX = {
       normal: /(auto|scroll)/,
       hidden: /(auto|scroll|hidden)/
@@ -22,6 +27,7 @@ angular.module('ui.bootstrap.position', [])
       secondary: /^(top|bottom|left|right|center)$/,
       vertical: /^(top|bottom)$/
     };
+    var BODY_REGEX = /(HTML|BODY)/;
 
     return {
 
@@ -75,10 +81,23 @@ angular.module('ui.bootstrap.position', [])
       /**
        * Provides the scrollbar width, concept from TWBS measureScrollbar()
        * function in https://github.com/twbs/bootstrap/blob/master/js/modal.js
+       * In IE and Edge, scollbar on body and html element overlay and should
+       * return a width of 0.
        *
        * @returns {number} The width of the browser scollbar.
        */
-      scrollbarWidth: function() {
+      scrollbarWidth: function(isBody) {
+        if (isBody) {
+          if (angular.isUndefined(BODY_SCROLLBAR_WIDTH)) {
+            var bodyElem = $document.find('body');
+            bodyElem.addClass('uib-position-body-scrollbar-measure');
+            BODY_SCROLLBAR_WIDTH = $window.innerWidth - bodyElem[0].clientWidth;
+            BODY_SCROLLBAR_WIDTH = isFinite(BODY_SCROLLBAR_WIDTH) ? BODY_SCROLLBAR_WIDTH : 0;
+            bodyElem.removeClass('uib-position-body-scrollbar-measure');
+          }
+          return BODY_SCROLLBAR_WIDTH;
+        }
+
         if (angular.isUndefined(SCROLLBAR_WIDTH)) {
           var scrollElem = angular.element('<div class="uib-position-scrollbar-measure"></div>');
           $document.find('body').append(scrollElem);
@@ -90,6 +109,40 @@ angular.module('ui.bootstrap.position', [])
         return SCROLLBAR_WIDTH;
       },
 
+      /**
+       * Provides the padding required on an element to replace the scrollbar.
+       *
+       * @returns {object} An object with the following properties:
+       *   <ul>
+       *     <li>**scrollbarWidth**: the width of the scrollbar</li>
+       *     <li>**widthOverflow**: whether the the width is overflowing</li>
+       *     <li>**right**: the amount of right padding on the element needed to replace the scrollbar</li>
+       *     <li>**rightOriginal**: the amount of right padding currently on the element</li>
+       *     <li>**heightOverflow**: whether the the height is overflowing</li>
+       *     <li>**bottom**: the amount of bottom padding on the element needed to replace the scrollbar</li>
+       *     <li>**bottomOriginal**: the amount of bottom padding currently on the element</li>
+       *   </ul>
+       */
+      scrollbarPadding: function(elem) {
+        elem = this.getRawNode(elem);
+
+        var elemStyle = $window.getComputedStyle(elem);
+        var paddingRight = this.parseStyle(elemStyle.paddingRight);
+        var paddingBottom = this.parseStyle(elemStyle.paddingBottom);
+        var scrollParent = this.scrollParent(elem, false, true);
+        var scrollbarWidth = this.scrollbarWidth(scrollParent, BODY_REGEX.test(scrollParent.tagName));
+
+        return {
+          scrollbarWidth: scrollbarWidth,
+          widthOverflow: scrollParent.scrollWidth > scrollParent.clientWidth,
+          right: paddingRight + scrollbarWidth,
+          originalRight: paddingRight,
+          heightOverflow: scrollParent.scrollHeight > scrollParent.clientHeight,
+          bottom: paddingBottom + scrollbarWidth,
+          originalBottom: paddingBottom
+         };
+      },
+
       /**
        * Checks to see if the element is scrollable.
        *
@@ -115,15 +168,20 @@ angular.module('ui.bootstrap.position', [])
        * @param {element} elem - The element to find the scroll parent of.
        * @param {boolean=} [includeHidden=false] - Should scroll style of 'hidden' be considered,
        *   default is false.
+       * @param {boolean=} [includeSelf=false] - Should the element being passed be
+       * included in the scrollable llokup.
        *
        * @returns {element} A HTML element.
        */
-      scrollParent: function(elem, includeHidden) {
+      scrollParent: function(elem, includeHidden, includeSelf) {
         elem = this.getRawNode(elem);
 
         var overflowRegex = includeHidden ? OVERFLOW_REGEX.hidden : OVERFLOW_REGEX.normal;
         var documentEl = $document[0].documentElement;
         var elemStyle = $window.getComputedStyle(elem);
+        if (includeSelf && overflowRegex.test(elemStyle.overflow + elemStyle.overflowY + elemStyle.overflowX)) {
+          return elem;
+        }
         var excludeStatic = elemStyle.position === 'absolute';
         var scrollParent = elem.parentElement || documentEl;