1 files changed, 79 insertions, 0 deletions
diff --git a/assets/compare.js b/assets/compare.js
new file mode 100644
index 0000000..2d0d3e5
--- /dev/null
+++ b/assets/compare.js
@@ -0,0 +1,79 @@
+jQuery(document).ready(function($){
+    //check if the .cd-image-container is in the viewport
+    //if yes, animate it
+    checkPosition($('.cd-image-container'));
+    $(window).on('scroll', function(){
+        checkPosition($('.cd-image-container'));
+    });
+    
+    //make the .cd-handle element draggable and modify .cd-resize-img width according to its position
+    drags($('.cd-handle'), $('.cd-resize-img'), $('.cd-image-container'), $('.cd-image-label[data-type="original"]'), $('.cd-image-label[data-type="modified"]'));
+
+    //upadate images label visibility
+    $(window).on('resize', function(){
+        updateLabel($('.cd-image-label[data-type="modified"]'), $('.cd-resize-img'), 'left');
+        updateLabel($('.cd-image-label[data-type="original"]'), $('.cd-resize-img'), 'right');
+    });
+});
+
+function checkPosition(container) {
+    if( $(window).scrollTop() + $(window).height()*0.5 > container.offset().top) {
+        container.addClass('is-visible');
+        //you can uncomment the following line if you don't have other events to bind to the window scroll
+        // $(window).off('scroll');
+    }
+}
+
+//draggable funtionality - credits to https://css-tricks.com/snippets/jquery/draggable-without-jquery-ui/
+function drags(dragElement, resizeElement, container, labelContainer, labelResizeElement) {
+    dragElement.on("mousedown vmousedown", function(e) {
+        dragElement.addClass('draggable');
+        resizeElement.addClass('resizable');
+
+        var dragWidth = dragElement.outerWidth(),
+            xPosition = dragElement.offset().left + dragWidth - e.pageX,
+            containerOffset = container.offset().left,
+            containerWidth = container.outerWidth(),
+            minLeft = containerOffset + 10,
+            maxLeft = containerOffset + containerWidth - dragWidth - 10;
+        
+        dragElement.parents().on("mousemove vmousemove", function(e) {
+            leftValue = e.pageX + xPosition - dragWidth;
+            
+            //constrain the draggable element to move inside his container
+            if(leftValue < minLeft ) {
+                leftValue = minLeft;
+            } else if ( leftValue > maxLeft) {
+                leftValue = maxLeft;
+            }
+
+            widthValue = (leftValue + dragWidth/2 - containerOffset)*100/containerWidth+'%';
+            
+            $('.draggable').css('left', widthValue).on("mouseup vmouseup", function() {
+                $(this).removeClass('draggable');
+                resizeElement.removeClass('resizable');
+            });
+
+            $('.resizable').css('width', widthValue);
+
+            updateLabel(labelResizeElement, resizeElement, 'left');
+            updateLabel(labelContainer, resizeElement, 'right');
+            
+        }).on("mouseup vmouseup", function(e){
+            dragElement.removeClass('draggable');
+            resizeElement.removeClass('resizable');
+        });
+        e.preventDefault();
+    }).on("mouseup vmouseup", function(e) {
+        dragElement.removeClass('draggable');
+        resizeElement.removeClass('resizable');
+    });
+}
+
+function updateLabel(label, resizeElement, position) {
+    if(position == 'left') {
+        ( label.offset().left + label.outerWidth() < resizeElement.offset().left + resizeElement.outerWidth() ) ? label.removeClass('is-hidden') : label.addClass('is-hidden') ;
+    } else {
+        ( label.offset().left > resizeElement.offset().left + resizeElement.outerWidth() ) ? label.removeClass('is-hidden') : label.addClass('is-hidden') ;
+    }
+}