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Refactor carousel code so more of it is in the Carousel class

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Load the script as a module
This commit is contained in:
Eryn Wells 2023-04-05 08:14:19 -07:00
parent bb655bcf30
commit ad9f83ed39
2 changed files with 124 additions and 94 deletions
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212
assets/scripts/photos/carousel.js
View file

@ -2,10 +2,109 @@
class Carousel { class Carousel {
carousel = null; carousel = null;
#items = null;
#caption = null;
constructor(element) { constructor(element) {
this.carousel = element; this.carousel = element;
this.#caption = element.querySelector("figcaption");
} }
get items() {
if (this.#items === null) {
const boundingRect = this.carousel.getBoundingClientRect();
this.#items = Array.from(this.carousel.querySelectorAll("ul > li")).map(item => {
let itemRect = item.getClientRects()[0];
let relativeX = itemRect.x - boundingRect.x;
return new CarouselItem(item, relativeX);
});
}
return this.#items;
}
get scrollContainer() {
return this.carousel.querySelector("ul");
}
setCaption(caption) {
if (!this.#caption) {
return;
}
this.#caption.innerHTML = caption;
}
scrollTo(index) {
this.scrollContainer.scrollTo(this.items[index].relativeX, 0);
}
setUpScrollEventListener(photoParametersTable) {
let previousScrollLeft = null;
let isScrollingLeft = true;
this.scrollContainer.addEventListener("scroll", event => {
const target = event.target;
const scrollLeft = target.scrollLeft;
const carouselRect = target.getBoundingClientRect();
const carouselRectHorizontalCenter = carouselRect.width / 2.0;
if (previousScrollLeft !== null) {
isScrollingLeft = scrollLeft > previousScrollLeft;
}
previousScrollLeft = scrollLeft;
this.items.forEach(item => {
const itemRelativeXCoordinate = isScrollingLeft ? item.relativeX - scrollLeft : item.relativeMaxX - scrollLeft;
const itemWasLeftOfContainerCenter = item.isLeftOfContainerCenter;
const itemIsLeftOfContainerCenter = itemRelativeXCoordinate < carouselRectHorizontalCenter;
item.isLeftOfContainerCenter = itemIsLeftOfContainerCenter;
if ( (isScrollingLeft && (!itemWasLeftOfContainerCenter && itemIsLeftOfContainerCenter))
|| (!isScrollingLeft && (itemWasLeftOfContainerCenter && !itemIsLeftOfContainerCenter))) {
this.setCaption(item.title);
photoParametersTable.setMakeModel(item.make, item.model);
photoParametersTable.setLocation(item.latitude, item.longitude);
photoParametersTable.setMegapixels(item.megapixels);
photoParametersTable.setSize(item.width, item.height);
photoParametersTable.setISO(item.iso);
photoParametersTable.setFocalLength(item.focalLength);
photoParametersTable.setFNumber(item.fNumber);
photoParametersTable.setExposureTime(item.exposureTime);
}
});
});
}
}
class CarouselItem {
element = null;
relativeX = 0;
isLeftOfContainerCenter = false;
constructor(element, relativeX) {
this.element = element;
this.relativeX = relativeX
}
get relativeMaxX() {
const rect = this.element.getBoundingClientRect();
return this.relativeX + rect.width;
}
get title() { return this.element.dataset.title; }
get latitude() { return this.element.dataset.latitude; }
get longitude() { return this.element.dataset.longitude; }
get megapixels() { return this.element.dataset.megapixels; }
get width() { return this.element.dataset.width; }
get height() { return this.element.dataset.height; }
get make() { return this.element.dataset.make; }
get model() { return this.element.dataset.model; }
get iso() { return this.element.dataset.iso; }
get focalLength() { return this.element.dataset.focalLength; }
get fNumber() { return this.element.dataset.fNumber; }
get exposureTime() { return this.element.dataset.exposureTime; }
} }
class PhotoParametersTable { class PhotoParametersTable {
@ -171,104 +270,35 @@ class PhotoParametersTable {
} }
document.addEventListener("DOMContentLoaded", (event) => { document.addEventListener("DOMContentLoaded", (event) => {
let allCarousels = Array.from(document.querySelectorAll("figure.carousel")).sort((a, b) => { const carouselElements = document.querySelectorAll("figure.carousel");
const aRect = a.getBoundingClientRect(); if (carouselElements.length === 0) {
const bRect = a.getBoundingClientRect();
return aRect.top - bRect.top;
});
if (allCarousels.length === 0) {
return; return;
} }
let photoParams = null; const allCarousels = Array.from(carouselElements).sort((a, b) => {
const aRect = a.getBoundingClientRect();
const bRect = a.getBoundingClientRect();
return aRect.top - bRect.top;
}).map(elem => new Carousel(elem));
let photoParametersTable = null;
const photoParamsTableElement = document.querySelector(".photo-params table"); const photoParamsTableElement = document.querySelector(".photo-params table");
if (photoParamsTableElement) { if (photoParamsTableElement) {
photoParams = new PhotoParametersTable(photoParamsTableElement); photoParametersTable = new PhotoParametersTable(photoParamsTableElement);
} }
allCarousels.forEach(carouselElement => { allCarousels.forEach(carousel => {
class CarouselItem { carousel.setUpScrollEventListener(photoParametersTable);
element = null;
relativeX = 0;
isLeftOfContainerCenter = false;
constructor(element, relativeX) {
this.element = element;
this.relativeX = relativeX
}
get relativeMaxX() {
const rect = this.element.getBoundingClientRect();
return this.relativeX + rect.width;
}
get title() { return this.element.dataset.title; }
get latitude() { return this.element.dataset.latitude; }
get longitude() { return this.element.dataset.longitude; }
get megapixels() { return this.element.dataset.megapixels; }
get width() { return this.element.dataset.width; }
get height() { return this.element.dataset.height; }
get make() { return this.element.dataset.make; }
get model() { return this.element.dataset.model; }
get iso() { return this.element.dataset.iso; }
get focalLength() { return this.element.dataset.focalLength; }
get fNumber() { return this.element.dataset.fNumber; }
get exposureTime() { return this.element.dataset.exposureTime; }
}
let captionElement = carouselElement.querySelector("figcaption");
let carouselRect = carouselElement.getBoundingClientRect();
let carouselRectHorizontalCenter = carouselRect.width / 2.0;
let carouselItems = Array.from(carouselElement.querySelectorAll("ul > li")).map(item => {
let itemRect = item.getClientRects()[0];
let relativeX = itemRect.x - carouselRect.x;
return new CarouselItem(item, relativeX);
});
let previousScrollLeft = null;
let isScrollingLeft = true;
carouselElement.querySelector("ul").addEventListener("scroll", event => {
const target = event.target;
const scrollLeft = target.scrollLeft;
if (previousScrollLeft === null) {
carouselRect = target.getBoundingClientRect();
carouselRectHorizontalCenter = carouselRect.width / 2.0;
}
if (previousScrollLeft !== null) {
isScrollingLeft = scrollLeft > previousScrollLeft;
}
previousScrollLeft = scrollLeft;
carouselItems.forEach(item => {
const itemRelativeXCoordinate = isScrollingLeft ? item.relativeX - scrollLeft : item.relativeMaxX - scrollLeft;
const itemWasLeftOfContainerCenter = item.isLeftOfContainerCenter;
const itemIsLeftOfContainerCenter = itemRelativeXCoordinate < carouselRectHorizontalCenter;
item.isLeftOfContainerCenter = itemIsLeftOfContainerCenter;
if ( (isScrollingLeft && (!itemWasLeftOfContainerCenter && itemIsLeftOfContainerCenter))
|| (!isScrollingLeft && (itemWasLeftOfContainerCenter && !itemIsLeftOfContainerCenter))) {
if (captionElement) {
captionElement.innerHTML = item.title;
}
photoParams.setMakeModel(item.make, item.model);
photoParams.setLocation(item.latitude, item.longitude);
photoParams.setMegapixels(item.megapixels);
photoParams.setSize(item.width, item.height);
photoParams.setISO(item.iso);
photoParams.setFocalLength(item.focalLength);
photoParams.setFNumber(item.fNumber);
photoParams.setExposureTime(item.exposureTime);
}
});
});
}); });
const url = new URL(window.location);
let photoGetParameter = url.searchParams.get("photo");
if (photoGetParameter) {
try {
photoGetParameter = parseInt(photoGetParameter);
allCarousels[0].scrollTo(photoGetParameter);
} catch (e) {
console.error("Unable to parse 'photo' GET parameter as integer:", e);
}
}
}); });

6
layouts/photos/single.html
View file

@ -73,9 +73,9 @@
{{ define "scripts" }} {{ define "scripts" }}
{{- $photos := partial "photos/list.html" . -}} {{- $photos := partial "photos/list.html" . -}}
{{ if gt (len $photos) 1 }} {{ if gt (len $photos) 1 -}}
{{- with resources.Get "scripts/photos/carousel.js" | fingerprint "md5" -}} {{- with resources.Get "scripts/photos/carousel.js" | fingerprint "md5" -}}
<script src="{{ .RelPermalink }}"></script> <script type="module" src="{{ .RelPermalink }}"></script>
{{- end -}} {{- end -}}
{{ end }} {{- end }}
{{ end }} {{ end }}