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Merge pull request #34 from HackerspaceKRK/add-image-enlarging
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,30 +1,140 @@ | ||
| var lastScrollY = window.scrollY; | ||
| var documentElement = document.documentElement; | ||
| (() => { | ||
| // hellpers | ||
| const $$ = document.querySelectorAll.bind(document); | ||
| const $ = document.querySelector.bind(document); | ||
| const on = (elements, event, handler) => { | ||
| if (!Array.isArray(elements) && !(elements instanceof NodeList)) { | ||
| elements = [elements]; | ||
| } | ||
| elements.forEach((element) => { | ||
| element.addEventListener(event, handler); | ||
| }); | ||
| }; | ||
|
|
||
| function storeScrollData() { | ||
| var y = window.scrollY; | ||
| // hide scroll bar when scrolling down | ||
| let lastScrollY = window.scrollY; | ||
| const documentElement = document.documentElement; | ||
| function storeScrollData() { | ||
| var y = window.scrollY; | ||
|
|
||
| documentElement.setAttribute("data-header-transparent", ""); | ||
|
|
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| documentElement.setAttribute("data-header-transparent", ""); | ||
| var scrollStatus = ""; | ||
|
|
||
| if (y <= 0) { | ||
| scrollStatus = "top"; | ||
| } else if (window.innerHeight + y >= document.body.offsetHeight) { | ||
| scrollStatus = "bottom"; | ||
| } else { | ||
| var isScrollDown = y - lastScrollY > 0 ? true : false; | ||
| scrollStatus = isScrollDown ? "down" : "up"; | ||
| } | ||
|
|
||
| var scrollStatus = ""; | ||
|
|
||
| if (y <= 0) { | ||
| scrollStatus = "top"; | ||
| } else if ((window.innerHeight + y) >= document.body.offsetHeight) { | ||
| scrollStatus = "bottom"; | ||
| } else { | ||
| var isScrollDown = (y - lastScrollY > 0) ? true : false; | ||
| scrollStatus = isScrollDown ? "down" : "up"; | ||
| lastScrollY = y; | ||
| documentElement.setAttribute("data-scroll-status", scrollStatus); | ||
| } | ||
| on(window, "scroll", storeScrollData); | ||
| storeScrollData(); | ||
|
|
||
| lastScrollY = y; | ||
| documentElement.setAttribute("data-scroll-status", scrollStatus); | ||
| } | ||
| // image popup | ||
| let popupIdCounter = 0; | ||
| $$(".img-popup-trigger").forEach((trigger) => { | ||
| if (!trigger.id) { | ||
| const srcId = trigger.src | ||
| .split("/") | ||
| .pop() | ||
| .split(".")[0] | ||
| .replace(/[^a-zA-Z0-9]/g, ""); | ||
| trigger.id = "img-" + srcId + "-" + popupIdCounter++; | ||
| } | ||
| }); | ||
| on($$(".img-popup-trigger"), "click", function (e) { | ||
| const backdrop = document.createElement("div"); | ||
| const backdropStyle = backdrop.style; | ||
| backdropStyle.position = "fixed"; | ||
| backdropStyle.top = "0"; | ||
| backdropStyle.left = "0"; | ||
| backdropStyle.right = "0"; | ||
| backdropStyle.bottom = "0"; | ||
| backdropStyle.backgroundColor = "rgba(0, 0, 0, 0)"; | ||
| backdropStyle.zIndex = "9999"; | ||
| backdropStyle.display = "flex"; | ||
| backdropStyle.justifyContent = "center"; | ||
| backdropStyle.alignItems = "center"; | ||
| backdropStyle.transition = "background-color 0.4s, opacity 0.4s"; | ||
|
|
||
| window.addEventListener('scroll', function(e) { | ||
| storeScrollData(); | ||
| }); | ||
| const enlargedImage = document.createElement("img"); | ||
| const enlargedImageStyle = enlargedImage.style; | ||
| enlargedImageStyle.width = "90vw"; | ||
| enlargedImageStyle.height = "90vh"; | ||
| enlargedImageStyle.objectFit = "contain"; | ||
|
|
||
| enlargedImage.src = e.target.src; | ||
| enlargedImage.alt = e.target.alt; | ||
| enlargedImageStyle.opacity = "0"; | ||
| backdrop.appendChild(enlargedImage); | ||
|
|
||
| const transitionImage = document.createElement("img"); | ||
| const transitionImageStyle = transitionImage.style; | ||
| transitionImageStyle.position = "fixed"; | ||
| const setTransitionImageToRect = function (rect) { | ||
| transitionImageStyle.top = rect.top + "px"; | ||
| transitionImageStyle.left = rect.left + "px"; | ||
| transitionImageStyle.width = rect.width + "px"; | ||
| transitionImageStyle.height = rect.height + "px"; | ||
| }; | ||
| setTransitionImageToRect(e.target.getBoundingClientRect()); | ||
| transitionImage.src = e.target.src; | ||
| transitionImage.alt = e.target.alt; | ||
| transitionImageStyle.transitionDuration = "0.4s"; | ||
| transitionImageStyle.transitionProperty = "top, left, width, height"; | ||
| transitionImageStyle.transitionTimingFunction = "ease-in-out"; | ||
| transitionImageStyle.objectFit = "contain"; | ||
|
|
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| backdrop.appendChild(transitionImage); | ||
|
|
||
| // hide original image | ||
| e.target.style.opacity = "0"; | ||
|
|
||
| // watch the original image for src changes | ||
| const observer = new MutationObserver((mutations) => { | ||
| mutations.forEach((mutation) => { | ||
| if (mutation.attributeName === "src") { | ||
| enlargedImage.src = e.target.src; | ||
| transitionImage.src = e.target.src; | ||
| } | ||
| }); | ||
| }); | ||
| observer.observe(e.target, { attributes: true }); | ||
|
|
||
| let windowEventListener = null; | ||
| const hidePopup = function () { | ||
| backdropStyle.backgroundColor = "rgba(0, 0, 0, 0)"; | ||
| setTransitionImageToRect(e.target.getBoundingClientRect()); | ||
| enlargedImageStyle.opacity = "0"; | ||
| transitionImageStyle.opacity = "1"; | ||
| setTimeout(() => { | ||
| backdrop.remove(); | ||
| observer.disconnect(); | ||
| e.target.style.opacity = "1"; | ||
| }, 400); | ||
| window.removeEventListener("keydown", windowEventListener); | ||
| }; | ||
| on(backdrop, "click", hidePopup); | ||
| windowEventListener = window.addEventListener("keydown", (e) => { | ||
| if (e.key === "Escape") { | ||
| hidePopup(); | ||
| } | ||
| }); | ||
| document.body.appendChild(backdrop); | ||
|
|
||
| storeScrollData(); | ||
| setTimeout(() => { | ||
| setTransitionImageToRect(enlargedImage.getBoundingClientRect()); | ||
| backdropStyle.backgroundColor = "rgba(0, 0, 0, 0.9)"; | ||
| setTimeout(() => { | ||
| enlargedImageStyle.opacity = "1"; | ||
| transitionImageStyle.opacity = "0"; | ||
| }, 400); | ||
| }, 1); | ||
| }); | ||
| })(); |
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