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function main() {
var themeSelector = document.getElementById('theme_selector');
themeSelector.classList.remove('hidden');
runCarousel();
}
function runCarousel() {
var carouselContainer = document.getElementById("carousel"),
imageContainer = document.getElementById('image_container'),
leftButton = document.getElementById('carousel_left'),
rightButton = document.getElementById('carousel_right');
// Carousel logic
var carouselPosition = 0,
numImages = imageContainer.children.length;
function onCarouselRight() {
carouselPosition = (carouselPosition + 1);
if (carouselPosition === numImages) {
carouselPosition = 0;
}
updateCarousel();
}
function onCarouselLeft() {
carouselPosition = (carouselPosition - 1);
if (carouselPosition < 0) {
carouselPosition = numImages - 1;
}
updateCarousel();
}
function onImageClicked() {
var background = document.createElement('div');
background.classList.add('carousel_image_expanded_container');
var clone = this.cloneNode(true);
clone.classList.add('expanded');
background.append(clone);
clone.addEventListener('click', function(event) { event.stopPropagation(); });
background.addEventListener('click', function() { background.remove(); });
window.addEventListener('keydown', function(e) { if (e.key === 'Escape') background.remove(); });
document.body.parentElement.prepend(background);
}
function setImageClicked() {
for (var i = 0; i < numImages; i++) {
var image = imageList[i];
image.addEventListener('click', onImageClicked);
}
}
function updateCarousel() {
var selectedChildPosition = -(carouselPosition * 240);
imageContainer.style.transform = 'translate(' + selectedChildPosition + 'px, 0)';
for (var i = 0; i < numImages; i++) {
var image = imageList[i];
if (i !== carouselPosition) {
if (i === (carouselPosition - 1) % numImages) {
image.style.opacity = 0.3;
} else if (i !== 0 && i === (carouselPosition + 1) % numImages) {
image.style.opacity = 0.3;
} else {
image.style.opacity = 0;
}
} else {
image.style.opacity = 1;
}
image.style.pointerEvents = image.style.opacity > 0 ? 'all' : 'none';
}
rightButton.style.visibility = (carouselPosition === numImages - 1) ? 'hidden' : 'visible';
leftButton.style.visibility = (carouselPosition === 0) ? 'hidden' : 'visible';
}
// -- Set up on image clicked
var imageList = imageContainer.children,
numImages = imageContainer.children.length;
setImageClicked();
updateCarousel();
leftButton.addEventListener('click', onCarouselLeft);
rightButton.addEventListener('click', onCarouselRight);
// -- Fade in the container
imageContainer.style.opacity = '1';
}
window.onload = main;
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