Add slideshow for images

1 files changed, 153 insertions, 0 deletions

diff --git a/assets/js/components/image-slideshow.js b/assets/js/components/image-slideshow.js
new file mode 100644
index 00000000..bf41de93
--- /dev/null
+++ b/assets/js/components/image-slideshow.js
@@ -0,0 +1,153 @@
+KB.component('image-slideshow', function (containerElement, options) {
+    var currentImage;
+
+    function onKeyDown(e) {
+        switch (e.keyCode) {
+            case 27:
+                destroySlide();
+                break;
+            case 39:
+                renderNextSlide();
+                break;
+            case 37:
+                renderPreviousSlide();
+                break;
+        }
+    }
+
+    function onOverlayClick(element) {
+        if (element.matches('.slideshow-next-icon')) {
+            renderNextSlide();
+        } else if (element.matches('.slideshow-previous-icon')) {
+            renderPreviousSlide();
+        } else {
+            destroySlide();
+        }
+    }
+
+    function onClick(element) {
+        var imageId = KB.dom(element).data('imageId');
+        var image = getImage(imageId);
+
+        renderSlide(image);
+    }
+
+    function renderNextSlide() {
+        destroySlide();
+
+        for (var i = 0; i < options.images.length; i++) {
+            if (options.images[i].id === currentImage.id) {
+                var index = i + 1;
+
+                if (index >= options.images.length) {
+                    index = 0;
+                }
+
+                currentImage = options.images[index];
+                break;
+            }
+        }
+
+        renderSlide();
+    }
+
+    function renderPreviousSlide() {
+        destroySlide();
+
+        for (var i = 0; i < options.images.length; i++) {
+            if (options.images[i].id === currentImage.id) {
+                var index = i - 1;
+
+                if (index < 0) {
+                    index = options.images.length - 1;
+                }
+
+                currentImage = options.images[index];
+                break;
+            }
+        }
+
+        renderSlide();
+    }
+
+    function renderSlide() {
+        var closeElement = KB.dom('div')
+            .attr('class', 'fa fa-window-close slideshow-icon slideshow-close-icon')
+            .build();
+
+        var previousElement = KB.dom('div')
+            .attr('class', 'fa fa-chevron-circle-left slideshow-icon slideshow-previous-icon')
+            .build();
+
+        var nextElement = KB.dom('div')
+            .attr('class', 'fa fa-chevron-circle-right slideshow-icon slideshow-next-icon')
+            .build();
+
+        var imageElement = KB.dom('img')
+            .attr('src', getUrl(currentImage, 'image'))
+            .attr('alt', currentImage.name)
+            .attr('title', currentImage.name)
+            .style('maxHeight', (window.innerHeight - 50) + 'px')
+            .build();
+
+        var captionElement = KB.dom('figcaption')
+            .text(currentImage.name)
+            .build();
+
+        var figureElement = KB.dom('figure')
+            .add(imageElement)
+            .add(captionElement)
+            .build();
+
+        var overlayElement = KB.dom('div')
+            .addClass('image-slideshow-overlay')
+            .add(closeElement)
+            .add(previousElement)
+            .add(nextElement)
+            .add(figureElement)
+            .click(onOverlayClick)
+            .build();
+
+        document.body.appendChild(overlayElement);
+        document.addEventListener('keydown', onKeyDown, false);
+    }
+
+    function destroySlide() {
+        var overlayElement = KB.find('.image-slideshow-overlay');
+
+        if (overlayElement !== null) {
+            document.removeEventListener('keydown', onKeyDown, false);
+            overlayElement.remove();
+        }
+    }
+
+    function getImage(imageId) {
+        for (var i = 0; i < options.images.length; i++) {
+            if (options.images[i].id === imageId) {
+                return options.images[i];
+            }
+        }
+
+        return null;
+    }
+
+    function getUrl(image, type) {
+        var regex = new RegExp(options.regex, 'g');
+        return options.url[type].replace(regex, image.id);
+    }
+
+    function buildThumbnailElement(image) {
+        return KB.dom('img')
+            .attr('src', getUrl(image, 'thumbnail'))
+            .attr('alt', image.name)
+            .attr('title', image.name)
+            .data('imageId', image.id)
+            .click(onClick)
+            .build();
+    }
+
+    this.render = function () {
+        currentImage = options.image;
+        containerElement.appendChild(buildThumbnailElement(currentImage));
+    };
+});