fix(Cornnerstone): BCTHEME-52 - Allowing carousel image to stretch distorts image

assets/js/theme/common/carousel.js

@@ -1,21 +1,62 @@
 import 'slick-carousel';
 
+const showCarouselIfSlidesAnalizedSetup = ($carousel) => {
+    const analizedSlides = [];
+    return ($slides) => ($slide) => {
+        analizedSlides.push($slide);
+        return $slides.length === analizedSlides.length
+            && $carousel.addClass('is-visible');
+    };
+};
+
 export default function () {
     const $carousel = $('[data-slick]');
-    if ($carousel.length) {
-        const multipleSlides = $carousel[0].childElementCount > 1;
-        $carousel.slick({ dots: multipleSlides });
-    }
+
+    if ($carousel.length === 0) return;
+
+    $carousel.slick({ dots: $carousel[0].childElementCount > 1 });
+
+    const $slidesNodes = $('.heroCarousel-slide');
+
+    const showCarouselIfSlidesAnalized = showCarouselIfSlidesAnalizedSetup($carousel)($slidesNodes);
+
+    $slidesNodes.each((index, element) => {
+        const $element = $(element);
+        const isContentBlock = !!$element.find('.heroCarousel-content').length;
+
+        if (isContentBlock) {
+            showCarouselIfSlidesAnalized($element);
+            return true;
+        }
+
+        const $image = $element.find('.heroCarousel-image-wrapper img');
+        $('<img/>')
+            .attr('src', $($image).attr('src'))
+            .load(function getImageSizes() {
+                const imageRealWidth = this.width;
+                const imageRealHeight = this.height;
+
+                const imageAspectRatio = imageRealHeight / imageRealWidth;
+
+                $element.addClass(() => {
+                    switch (true) {
+                    case imageAspectRatio > 0.8 && imageAspectRatio <= 1.2:
+                        return 'is-square-image-type';
+                    case imageAspectRatio > 1.2:
+                        return 'is-vertical-image-type';
+                    default:
+                        return '';
+                    }
+                });
+
+                showCarouselIfSlidesAnalized($element);
+            });
+    });
 
     // Alternative image styling for IE, which doesn't support objectfit
-    if (typeof document.documentElement.style.objectFit === 'undefined') {
-        $('.heroCarousel-slide').each((index, element) => {
-            const $container = $(element);
-            const imgUrl = $container.find('img').data('lazy');
-
-            if (imgUrl) {
-                $container.css('backgroundImage', `url(${imgUrl})`).addClass('compat-object-fit');
-            }
+    if (document.documentElement.style.objectFit === undefined) {
+        $slidesNodes.each((index, element) => {
+            $(element).addClass('compat-object-fit');
         });
     }
 }

assets/scss/components/stencil/heroCarousel/_heroCarousel.scss

@@ -9,10 +9,6 @@
 //    object-fit and instead copy the image src to a the background-image of the
 //    wrapper div and add the compat-object-fit class.
 //
-// 2. Visually overrides the top margin for '.body' defined in _body.scss.
-//    The '.body' top margin creates space between the header and page content.
-//    However, on the homepage, we want the carousel to be flush with the header.
-//
 // 3. Allows image to scale on large screens while preventing the top and bottom
 //    from becoming cut off.
 // -----------------------------------------------------------------------------
@@ -22,14 +18,28 @@
     min-width: 100%;
     margin-bottom: (spacing("double") + spacing("single"));
     margin-top: -(spacing("single")); // 3
+    overflow: hidden;
+    visibility: hidden;
+
+    &.is-visible {
+        visibility: visible;
+    }
 
     @include breakpoint("medium") {
         margin-top: -(spacing("single") + spacing("base")); // 3
     }
 
-    &.slick-initialized { // 2
-        max-height: remCalc(1000);
+    &.slick-initialized {
         opacity: 1;
+        max-height: 100vh;
+
+        @include breakpoint("small") {
+            max-height: remCalc(400px);            
+        }
+
+        @include breakpoint("medium") {
+            max-height: remCalc(600px);            
+        }
     }
 
     &:not(.slick-initialized) :not(.heroCarousel-slide--first).heroCarousel-slide {
@@ -43,6 +53,8 @@
     .slick-next,
     .slick-prev {
         top: 50%;
+        transform: translateY(-50%);
+        margin: 0;
     }
 
     .slick-next {
@@ -82,32 +94,73 @@
     }
 
     .heroCarousel-image {
-        @include breakpoint("medium") {
-            object-fit: cover; // 1
-            max-height: remCalc(600px);
-            width: 100%;
+        object-fit: contain;
+        width: 100%;
+        height: 100%;
+        object-position: 50% 0%;
+
+        @include breakpoint("small") {
+            object-position: 50% 50%;
+        }
+    }
+
+    &.stretch {
+        .heroCarousel-image {
+            object-fit: cover;
+            object-position: 50% 50%;
+        }
+
+        &.compat-object-fit { // 1
+            .heroCarousel-image {
+                width: 100%;
+                height: 100%;
+            }
+        }
+    }    
+
+    &.compat-object-fit { // 1
+        overflow: hidden;
+
+        .heroCarousel-image {
+            width: auto;
         }
     }
 
     .heroCarousel-image-wrapper {
+        height: remCalc(250px);
+        display: flex;
+        justify-content: center;
+        align-items: flex-start;
+        height: 56.25vw;
+
+        @include breakpoint("small") {
+            max-height: remCalc(400px);
+        }
+
         @include breakpoint("medium") {
             max-height: remCalc(600px);
         }
     }
 
-    &.compat-object-fit { // 1
-        background-size: cover;
-        background-position: 50%;
-        background-repeat: no-repeat;
-
-        &.stretch {
-            @include breakpoint("large") { // 4
-                background-size: 100% 100%;
-            }
+    &.is-square-image-type {
+
+        .heroCarousel-image-wrapper {
+            height: 100vw;
+
+            @include breakpoint("small") {
+                height: 56.25vw;
+            }    
         }
+    }
 
-        .heroCarousel-image {
-            opacity: 0;
+    &.is-vertical-image-type {
+
+        .heroCarousel-image-wrapper {
+            height: 110vw;
+
+            @include breakpoint("small") {
+                height: 56.25vw;
+            }    
         }
     }
 }
@@ -117,17 +170,19 @@
     padding: spacing("half") spacing("single") (spacing("double"));
     text-align: center;
 
-    @include breakpoint("medium") {
+    @include breakpoint("small") {
         @include carouselOpaqueBackgrounds;
+        width: remCalc(700px);
+        padding: spacing("single") * 1.5;
+        width: 70%;
         background-color: rgba($carousel-bgColor, 0.9);
         left: 0;
+        padding: spacing("single");
         margin: 0 auto;
-        padding: spacing("single") * 1.5;
         position: absolute;
         right: 0;
         top: 50%;
         transform: translateY(-50%);
-        width: remCalc(700px);
 
         &.heroCarousel-content--empty {
             background-color: transparent;

templates/components/carousel.html

@@ -6,12 +6,12 @@
         "slidesToScroll": 1,
         "autoplay": true,
         "autoplaySpeed": {{carousel.swap_frequency}},
-        "lazyLoad": "anticipated"
+        "lazyLoad": "anticipated",
     }'>
     {{#each carousel.slides}}
     <a href="{{url}}">
         <div class="heroCarousel-slide {{#if ../theme_settings.homepage_stretch_carousel_images}}stretch{{/if}} {{#if @first}}heroCarousel-slide--first{{/if}}">
-            <div class="heroCarousel-image-wrapper" {{#and image_height image_width}}style="height: {{multiply (divide image_height image_width) 100}}vw"{{/and}}>
+            <div class="heroCarousel-image-wrapper">
             {{#if @first}}
                 {{> components/common/responsive-img
                     image=stencil_image