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const Flickity = require("flickity")
import "flickity/dist/flickity.min.css"
export default function initSlides() {
/* Flickity function for scrolling to ensure next and prev pics are always
* visible and to transition between states */
function scroll(progress) {
const normalizedProgress = progress / (1 / (flkty.cells.length-1))
const liveSelectedIndex = Math.round(normalizedProgress)
const localizedProgress = normalizedProgress - liveSelectedIndex
const prevSelectedCell = flkty.cells.at(liveSelectedIndex-1).element
const liveSelectedCell = flkty.cells.at(liveSelectedIndex % flkty.cells.length).element
const nextSelectedCell = flkty.cells.at((liveSelectedIndex+1) % flkty.cells.length).element
const prevSelectedImage = prevSelectedCell.firstElementChild
const liveSelectedImage = liveSelectedCell.firstElementChild
const nextSelectedImage = nextSelectedCell.firstElementChild
const prevMargin = prevSelectedCell.clientWidth - prevSelectedImage.clientWidth
const liveMargin = liveSelectedCell.clientWidth - liveSelectedImage.clientWidth
const nextMargin = nextSelectedCell.clientWidth - nextSelectedImage.clientWidth
liveSelectedImage.style.marginLeft = liveMargin / 2 + "px"
nextSelectedImage.style.marginLeft = Math.max(0, Math.min(nextMargin, nextMargin * (localizedProgress))) + "px"
prevSelectedImage.style.marginLeft = prevMargin - Math.max(0, Math.min(prevMargin, prevMargin * localizedProgress * -1)) + "px" // TODO clean this
}
/* jump to clicked on slide */
function staticClick(e, pointer, cellElement, cellIndex) {
flkty.select(cellIndex)
}
/* make sure images have correct margin when loaded since scroll function
* depends on them being loaded */
function positionImageStatic(img) {
const i = parseInt(img.dataset.index)
if (i == flkty.selectedIndex)
img.style.marginLeft = (img.parentElement.clientWidth - img.clientWidth) / 2 + "px"
else if ((i + 1) % flkty.cells.length == flkty.selectedIndex)
img.style.marginLeft = img.parentElement.clientWidth - img.clientWidth + "px"
}
function imageLoaded(e) { positionImageStatic(e.target) }
function initImages() {
const imgs = document.querySelectorAll("#slideshow-carousel img")
for (let i = 0; i < imgs.length; i++) {
const img = imgs[i]
img.dataset.index = i
img.addEventListener("load", imageLoaded)
if (img.complete)
positionImageStatic(img)
}
}
/* initialize slides */
const flkty = new Flickity('#slideshow-carousel', {
wrapAround: true,
prevNextButtons: false,
pageDots: false,
resize: true,
setGallerySize: false,
})
flkty.on("scroll", scroll)
flkty.on("staticClick", staticClick)
initImages()
}
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