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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 if (element.matches('.slideshow-download-icon')) {
window.location.href = element.href;
} 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 downloadElement = KB.dom('a')
.attr('class', 'fa fa-download slideshow-icon slideshow-download-icon')
.attr('href', getUrl(currentImage, 'download'))
.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(downloadElement)
.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));
};
});
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