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import $ from 'jquery';
import {GET} from '../modules/fetch.js';
import {hideElem, loadElem, queryElemChildren} from '../utils/dom.js';
import {parseDom} from '../utils.js';
function getDefaultSvgBoundsIfUndefined(text, src) {
const DefaultSize = 300;
const MaxSize = 99999;
const svgDoc = parseDom(text, 'image/svg+xml');
const svg = svgDoc.documentElement;
const width = svg?.width?.baseVal;
const height = svg?.height?.baseVal;
if (width === undefined || height === undefined) {
return null; // in case some svg is invalid or doesn't have the width/height
}
if (width.unitType === SVGLength.SVG_LENGTHTYPE_PERCENTAGE || height.unitType === SVGLength.SVG_LENGTHTYPE_PERCENTAGE) {
const img = new Image();
img.src = src;
if (img.width > 1 && img.width < MaxSize && img.height > 1 && img.height < MaxSize) {
return {
width: img.width,
height: img.height,
};
}
if (svg.hasAttribute('viewBox')) {
const viewBox = svg.viewBox.baseVal;
return {
width: DefaultSize,
height: DefaultSize * viewBox.width / viewBox.height,
};
}
return {
width: DefaultSize,
height: DefaultSize,
};
}
return null;
}
function createContext(imageAfter, imageBefore) {
const sizeAfter = {
width: imageAfter?.width || 0,
height: imageAfter?.height || 0,
};
const sizeBefore = {
width: imageBefore?.width || 0,
height: imageBefore?.height || 0,
};
const maxSize = {
width: Math.max(sizeBefore.width, sizeAfter.width),
height: Math.max(sizeBefore.height, sizeAfter.height),
};
return {
imageAfter,
imageBefore,
sizeAfter,
sizeBefore,
maxSize,
ratio: [
Math.floor(maxSize.width - sizeAfter.width) / 2,
Math.floor(maxSize.height - sizeAfter.height) / 2,
Math.floor(maxSize.width - sizeBefore.width) / 2,
Math.floor(maxSize.height - sizeBefore.height) / 2,
],
};
}
export function initImageDiff() {
$('.image-diff:not([data-image-diff-loaded])').each(async function() {
const $container = $(this);
this.setAttribute('data-image-diff-loaded', 'true');
// the container may be hidden by "viewed" checkbox, so use the parent's width for reference
const diffContainerWidth = Math.max($container.closest('.diff-file-box').width() - 300, 100);
const imageInfos = [{
path: this.getAttribute('data-path-after'),
mime: this.getAttribute('data-mime-after'),
$images: $container.find('img.image-after'), // matches 3 <img>
$boundsInfo: $container.find('.bounds-info-after'),
}, {
path: this.getAttribute('data-path-before'),
mime: this.getAttribute('data-mime-before'),
$images: $container.find('img.image-before'), // matches 3 <img>
$boundsInfo: $container.find('.bounds-info-before'),
}];
await Promise.all(imageInfos.map(async (info) => {
const [success] = await Promise.all(Array.from(info.$images, (img) => {
return loadElem(img, info.path);
}));
// only the first images is associated with $boundsInfo
if (!success) info.$boundsInfo.text('(image error)');
if (info.mime === 'image/svg+xml') {
const resp = await GET(info.path);
const text = await resp.text();
const bounds = getDefaultSvgBoundsIfUndefined(text, info.path);
if (bounds) {
info.$images.each(function() {
this.setAttribute('width', bounds.width);
this.setAttribute('height', bounds.height);
});
hideElem(info.$boundsInfo);
}
}
}));
const $imagesAfter = imageInfos[0].$images;
const $imagesBefore = imageInfos[1].$images;
initSideBySide(this, createContext($imagesAfter[0], $imagesBefore[0]));
if ($imagesAfter.length > 0 && $imagesBefore.length > 0) {
initSwipe(createContext($imagesAfter[1], $imagesBefore[1]));
initOverlay(createContext($imagesAfter[2], $imagesBefore[2]));
}
queryElemChildren(this, '.image-diff-tabs', (el) => el.classList.remove('is-loading'));
function initSideBySide(container, sizes) {
let factor = 1;
if (sizes.maxSize.width > (diffContainerWidth - 24) / 2) {
factor = (diffContainerWidth - 24) / 2 / sizes.maxSize.width;
}
const widthChanged = sizes.imageAfter && sizes.imageBefore && sizes.imageAfter.naturalWidth !== sizes.imageBefore.naturalWidth;
const heightChanged = sizes.imageAfter && sizes.imageBefore && sizes.imageAfter.naturalHeight !== sizes.imageBefore.naturalHeight;
if (sizes.imageAfter) {
const boundsInfoAfterWidth = container.querySelector('.bounds-info-after .bounds-info-width');
if (boundsInfoAfterWidth) {
boundsInfoAfterWidth.textContent = `${sizes.imageAfter.naturalWidth}px`;
boundsInfoAfterWidth.classList.toggle('green', widthChanged);
}
const boundsInfoAfterHeight = container.querySelector('.bounds-info-after .bounds-info-height');
if (boundsInfoAfterHeight) {
boundsInfoAfterHeight.textContent = `${sizes.imageAfter.naturalHeight}px`;
boundsInfoAfterHeight.classList.toggle('green', heightChanged);
}
}
if (sizes.imageBefore) {
const boundsInfoBeforeWidth = container.querySelector('.bounds-info-before .bounds-info-width');
if (boundsInfoBeforeWidth) {
boundsInfoBeforeWidth.textContent = `${sizes.imageBefore.naturalWidth}px`;
boundsInfoBeforeWidth.classList.toggle('red', widthChanged);
}
const boundsInfoBeforeHeight = container.querySelector('.bounds-info-before .bounds-info-height');
if (boundsInfoBeforeHeight) {
boundsInfoBeforeHeight.textContent = `${sizes.imageBefore.naturalHeight}px`;
boundsInfoBeforeHeight.classList.add('red', heightChanged);
}
}
if (sizes.imageAfter) {
const container = sizes.imageAfter.parentNode;
sizes.imageAfter.style.width = `${sizes.sizeAfter.width * factor}px`;
sizes.imageAfter.style.height = `${sizes.sizeAfter.height * factor}px`;
container.style.margin = '10px auto';
container.style.width = `${sizes.sizeAfter.width * factor + 2}px`;
container.style.height = `${sizes.sizeAfter.height * factor + 2}px`;
}
if (sizes.imageBefore) {
const container = sizes.imageBefore.parentNode;
sizes.imageBefore.style.width = `${sizes.sizeBefore.width * factor}px`;
sizes.imageBefore.style.height = `${sizes.sizeBefore.height * factor}px`;
container.style.margin = '10px auto';
container.style.width = `${sizes.sizeBefore.width * factor + 2}px`;
container.style.height = `${sizes.sizeBefore.height * factor + 2}px`;
}
}
function initSwipe(sizes) {
let factor = 1;
if (sizes.maxSize.width > diffContainerWidth - 12) {
factor = (diffContainerWidth - 12) / sizes.maxSize.width;
}
if (sizes.imageAfter) {
const container = sizes.imageAfter.parentNode;
const swipeFrame = container.parentNode;
sizes.imageAfter.style.width = `${sizes.sizeAfter.width * factor}px`;
sizes.imageAfter.style.height = `${sizes.sizeAfter.height * factor}px`;
container.style.margin = `0px ${sizes.ratio[0] * factor}px`;
container.style.width = `${sizes.sizeAfter.width * factor + 2}px`;
container.style.height = `${sizes.sizeAfter.height * factor + 2}px`;
swipeFrame.style.padding = `${sizes.ratio[1] * factor}px 0 0 0`;
swipeFrame.style.width = `${sizes.maxSize.width * factor + 2}px`;
}
if (sizes.imageBefore) {
const container = sizes.imageBefore.parentNode;
const swipeFrame = container.parentNode;
sizes.imageBefore.style.width = `${sizes.sizeBefore.width * factor}px`;
sizes.imageBefore.style.height = `${sizes.sizeBefore.height * factor}px`;
container.style.margin = `${sizes.ratio[3] * factor}px ${sizes.ratio[2] * factor}px`;
container.style.width = `${sizes.sizeBefore.width * factor + 2}px`;
container.style.height = `${sizes.sizeBefore.height * factor + 2}px`;
swipeFrame.style.width = `${sizes.maxSize.width * factor + 2}px`;
swipeFrame.style.height = `${sizes.maxSize.height * factor + 2}px`;
}
// extra height for inner "position: absolute" elements
const swipe = $container.find('.diff-swipe')[0];
if (swipe) {
swipe.style.width = `${sizes.maxSize.width * factor + 2}px`;
swipe.style.height = `${sizes.maxSize.height * factor + 30}px`;
}
$container.find('.swipe-bar').on('mousedown', function(e) {
e.preventDefault();
const $swipeBar = $(this);
const $swipeFrame = $swipeBar.parent();
const width = $swipeFrame.width() - $swipeBar.width() - 2;
$(document).on('mousemove.diff-swipe', (e2) => {
e2.preventDefault();
const value = Math.max(0, Math.min(e2.clientX - $swipeFrame.offset().left, width));
$swipeBar[0].style.left = `${value}px`;
$container.find('.swipe-container')[0].style.width = `${$swipeFrame.width() - value}px`;
$(document).on('mouseup.diff-swipe', () => {
$(document).off('.diff-swipe');
});
});
});
}
function initOverlay(sizes) {
let factor = 1;
if (sizes.maxSize.width > diffContainerWidth - 12) {
factor = (diffContainerWidth - 12) / sizes.maxSize.width;
}
if (sizes.imageAfter) {
const container = sizes.imageAfter.parentNode;
sizes.imageAfter.style.width = `${sizes.sizeAfter.width * factor}px`;
sizes.imageAfter.style.height = `${sizes.sizeAfter.height * factor}px`;
container.style.margin = `${sizes.ratio[1] * factor}px ${sizes.ratio[0] * factor}px`;
container.style.width = `${sizes.sizeAfter.width * factor + 2}px`;
container.style.height = `${sizes.sizeAfter.height * factor + 2}px`;
}
if (sizes.imageBefore) {
const container = sizes.imageBefore.parentNode;
const overlayFrame = container.parentNode;
sizes.imageBefore.style.width = `${sizes.sizeBefore.width * factor}px`;
sizes.imageBefore.style.height = `${sizes.sizeBefore.height * factor}px`;
container.style.margin = `${sizes.ratio[3] * factor}px ${sizes.ratio[2] * factor}px`;
container.style.width = `${sizes.sizeBefore.width * factor + 2}px`;
container.style.height = `${sizes.sizeBefore.height * factor + 2}px`;
// some inner elements are `position: absolute`, so the container's height must be large enough
overlayFrame.style.width = `${sizes.maxSize.width * factor + 2}px`;
overlayFrame.style.height = `${sizes.maxSize.height * factor + 2}px`;
}
const rangeInput = $container[0].querySelector('input[type="range"]');
function updateOpacity() {
if (sizes.imageAfter) {
sizes.imageAfter.parentNode.style.opacity = `${rangeInput.value / 100}`;
}
}
rangeInput?.addEventListener('input', updateOpacity);
updateOpacity();
}
});
}
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