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assets/css/vanilla-zoom.min.css

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+.vanilla-zoom {
+  width: 100%;
+  /*display: flex;*/
+}
+
+.vanilla-zoom .sidebar {
+  /*flex-basis: 30%;*/
+  width: 100%;
+  display: flex;
+  /*flex-direction: column;*/
+}
+
+.vanilla-zoom .sidebar img.small-preview {
+  width: 60px;
+  margin-right: 5px;
+  cursor: pointer;
+  opacity: .5;
+}
+
+.vanilla-zoom .sidebar img.small-preview.active, .vanilla-zoom .sidebar img.small-preview:hover {
+  opacity: 1;
+}
+
+.vanilla-zoom .sidebar img.small-preview:last-child {
+  margin-right: 0;
+}
+
+.vanilla-zoom .zoomed-image {
+  width: 100%;
+  height: 300px;
+  flex: 1;
+  background-repeat: no-repeat;
+  background-position: left center;
+  background-size: contain;
+  margin-bottom: 5px;
+}
+

assets/js/theme.js

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+// Custom theme code
+
+if (document.getElementsByClassName('clean-gallery').length > 0) {
+   baguetteBox.run('.clean-gallery', { animation: 'slideIn' });
+}
+
+if (document.getElementsByClassName('clean-product').length > 0) {
+    window.onload = function() {
+        vanillaZoom.init('#product-preview');
+    };
+}

assets/js/vanilla-zoom.js

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+(function(window){
+    function define_library() {
+        var vanillaZoom = {};
+        vanillaZoom.init = function(el) {
+
+            var container = document.querySelector(el);
+            if(!container) {
+                console.error('No container element. Please make sure you are using the right markup.');
+                return;
+            }
+
+            var firstSmallImage = container.querySelector('.small-preview');
+            var zoomedImage = container.querySelector('.zoomed-image');
+
+            if(!zoomedImage) {
+                console.error('No zoomed image element. Please make sure you are using the right markup.');
+                return;
+            }
+
+            if(!firstSmallImage) {
+                console.error('No preview images on page. Please make sure you are using the right markup.');
+                return;
+            }
+            else {
+                // Set the source of the zoomed image.
+                zoomedImage.style.backgroundImage = 'url('+ firstSmallImage.src +')';
+                firstSmallImage.classList.add('active');
+            }   
+
+            // Change the selected image to be zoomed when clicking on the previews.
+            container.addEventListener("click", function (event) {
+                var elem = event.target;
+
+                if (elem.classList.contains("small-preview")) {
+                    
+                    var allSmallPreviews = container.querySelectorAll(".small-preview");
+                    
+                    allSmallPreviews.forEach(function (preview) {
+                        preview.classList.remove('active');
+                    })
+                    
+                    elem.classList.add('active');
+                    
+                    var imageSrc = elem.src;
+                    zoomedImage.style.backgroundImage = 'url('+ imageSrc +')';
+                }
+            });
+            
+            // Zoom image on mouse enter.
+            zoomedImage.addEventListener('mouseenter', function(e) {
+                this.style.backgroundSize = "250%"; 
+            }, false);
+
+
+            // Show different parts of image depending on cursor position.
+            zoomedImage.addEventListener('mousemove', function(e) {
+                
+                // getBoundingClientReact gives us various information about the position of the element.
+                var dimentions = this.getBoundingClientRect();
+
+                // Calculate the position of the cursor inside the element (in pixels).
+                var x = e.clientX - dimentions.left;
+                var y = e.clientY - dimentions.top;
+
+                // Calculate the position of the cursor as a percentage of the total width/height of the element.
+                var xpercent = Math.round(100 / (dimentions.width / x));
+                var ypercent = Math.round(100 / (dimentions.height / y));
+
+                // Update the background position of the image.
+                this.style.backgroundPosition = xpercent+'% ' + ypercent+'%';
+            
+            }, false);
+
+
+            // When leaving the container zoom out the image back to normal size.
+            zoomedImage.addEventListener('mouseleave', function(e) {
+                this.style.backgroundSize = "contain"; 
+                this.style.backgroundPosition = "left center"; 
+            }, false);
+
+        }
+        return vanillaZoom;
+    }
+
+    // Add the vanillaZoom object to global scope.
+    if(typeof(vanillaZoom) === 'undefined') {
+        window.vanillaZoom = define_library();
+    }
+    else{
+        console.log("Library already defined.");
+    }
+})(window);