import $ from 'jquery'; import {GET} from '../modules/fetch.ts'; import {hideElem, loadElem, queryElemChildren, queryElems} from '../utils/dom.ts'; import {parseDom} from '../utils.ts'; 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, ], }; } class ImageDiff { async init(containerEl) { this.containerEl = containerEl; containerEl.setAttribute('data-image-diff-loaded', 'true'); // the only jQuery usage in this file $(containerEl).find('.ui.menu.tabular .item').tab({autoTabActivation: false}); // the container may be hidden by "viewed" checkbox, so use the parent's width for reference this.diffContainerWidth = Math.max(containerEl.closest('.diff-file-box').clientWidth - 300, 100); const imageInfos = [{ path: containerEl.getAttribute('data-path-after'), mime: containerEl.getAttribute('data-mime-after'), images: containerEl.querySelectorAll('img.image-after'), // matches 3 boundsInfo: containerEl.querySelector('.bounds-info-after'), }, { path: containerEl.getAttribute('data-path-before'), mime: containerEl.getAttribute('data-mime-before'), images: containerEl.querySelectorAll('img.image-before'), // matches 3 boundsInfo: containerEl.querySelector('.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) info.boundsInfo.textContent = '(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) { for (const el of info.images) { el.setAttribute('width', bounds.width); el.setAttribute('height', bounds.height); } hideElem(info.boundsInfo); } } })); const imagesAfter = imageInfos[0].images; const imagesBefore = imageInfos[1].images; this.initSideBySide(createContext(imagesAfter[0], imagesBefore[0])); if (imagesAfter.length > 0 && imagesBefore.length > 0) { this.initSwipe(createContext(imagesAfter[1], imagesBefore[1])); this.initOverlay(createContext(imagesAfter[2], imagesBefore[2])); } queryElemChildren(containerEl, '.image-diff-tabs', (el) => el.classList.remove('is-loading')); } initSideBySide(sizes) { let factor = 1; if (sizes.maxSize.width > (this.diffContainerWidth - 24) / 2) { factor = (this.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 = this.containerEl.querySelector('.bounds-info-after .bounds-info-width'); if (boundsInfoAfterWidth) { boundsInfoAfterWidth.textContent = `${sizes.imageAfter.naturalWidth}px`; boundsInfoAfterWidth.classList.toggle('green', widthChanged); } const boundsInfoAfterHeight = this.containerEl.querySelector('.bounds-info-after .bounds-info-height'); if (boundsInfoAfterHeight) { boundsInfoAfterHeight.textContent = `${sizes.imageAfter.naturalHeight}px`; boundsInfoAfterHeight.classList.toggle('green', heightChanged); } } if (sizes.imageBefore) { const boundsInfoBeforeWidth = this.containerEl.querySelector('.bounds-info-before .bounds-info-width'); if (boundsInfoBeforeWidth) { boundsInfoBeforeWidth.textContent = `${sizes.imageBefore.naturalWidth}px`; boundsInfoBeforeWidth.classList.toggle('red', widthChanged); } const boundsInfoBeforeHeight = this.containerEl.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 = `${sizes.sizeBefore.height * factor + 2}px`; } } initSwipe(sizes) { let factor = 1; if (sizes.maxSize.width > this.diffContainerWidth - 12) { factor = (this.diffContainerWidth - 12) / sizes.maxSize.width; } if (sizes.imageAfter) { const imgParent = sizes.imageAfter.parentNode; const swipeFrame = imgParent.parentNode; sizes.imageAfter.style.width = `${sizes.sizeAfter.width * factor}px`; sizes.imageAfter.style.height = `${sizes.sizeAfter.height * factor}px`; imgParent.style.margin = `0px ${sizes.ratio[0] * factor}px`; imgParent.style.width = `${sizes.sizeAfter.width * factor + 2}px`; imgParent.style.height = `${sizes.sizeAfter.height * factor + 2}px`; swipeFrame.style.padding = `${sizes.ratio[1] * factor}px 0 0 0`; swipeFrame.style.width = `${sizes.maxSize.width * factor + 2}px`; } if (sizes.imageBefore) { const imgParent = sizes.imageBefore.parentNode; const swipeFrame = imgParent.parentNode; sizes.imageBefore.style.width = `${sizes.sizeBefore.width * factor}px`; sizes.imageBefore.style.height = `${sizes.sizeBefore.height * factor}px`; imgParent.style.margin = `${sizes.ratio[3] * factor}px ${sizes.ratio[2] * factor}px`; imgParent.style.width = `${sizes.sizeBefore.width * factor + 2}px`; imgParent.style.height = `${sizes.sizeBefore.height * factor + 2}px`; swipeFrame.style.width = `${sizes.maxSize.width * factor + 2}px`; swipeFrame.style.height = `${sizes.maxSize.height * factor + 2}px`; } // extra height for inner "position: absolute" elements const swipe = this.containerEl.querySelector('.diff-swipe'); if (swipe) { swipe.style.width = `${sizes.maxSize.width * factor + 2}px`; swipe.style.height = `${sizes.maxSize.height * factor + 30}px`; } this.containerEl.querySelector('.swipe-bar').addEventListener('mousedown', (e) => { e.preventDefault(); this.initSwipeEventListeners(e.currentTarget); }); } initSwipeEventListeners(swipeBar) { const swipeFrame = swipeBar.parentNode; const width = swipeFrame.clientWidth; const onSwipeMouseMove = (e) => { e.preventDefault(); const rect = swipeFrame.getBoundingClientRect(); const value = Math.max(0, Math.min(e.clientX - rect.left, width)); swipeBar.style.left = `${value}px`; this.containerEl.querySelector('.swipe-container').style.width = `${swipeFrame.clientWidth - value}px`; }; const removeEventListeners = () => { document.removeEventListener('mousemove', onSwipeMouseMove); document.removeEventListener('mouseup', removeEventListeners); }; document.addEventListener('mousemove', onSwipeMouseMove); document.addEventListener('mouseup', removeEventListeners); } initOverlay(sizes) { let factor = 1; if (sizes.maxSize.width > this.diffContainerWidth - 12) { factor = (this.diffContainerWidth - 12) / sizes.maxSize.width; } if (sizes.imageAfter) { const container = sizes.imageAfter.parentNode; sizes.imageAfter.style.width = `${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 = `${sizes.maxSize.height * factor + 2}px`; } const rangeInput = this.containerEl.querySelector('input[type="range"]'); function updateOpacity() { if (sizes.imageAfter) { sizes.imageAfter.parentNode.style.opacity = `${rangeInput.value / 100}`; } } rangeInput?.addEventListener('input', updateOpacity); updateOpacity(); } } export function initImageDiff() { for (const el of queryElems('.image-diff:not([data-image-diff-loaded])')) { (new ImageDiff()).init(el); // it is async, but we don't need to await for it } }