import $ from 'jquery'; import {GET} from '../modules/fetch.js'; import {hideElem, loadElem} 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; } export function initImageDiff() { function createContext(image1, image2) { const size1 = { width: image1 && image1.width || 0, height: image1 && image1.height || 0 }; const size2 = { width: image2 && image2.width || 0, height: image2 && image2.height || 0 }; const max = { width: Math.max(size2.width, size1.width), height: Math.max(size2.height, size1.height) }; return { image1: $(image1), image2: $(image2), size1, size2, max, ratio: [ Math.floor(max.width - size1.width) / 2, Math.floor(max.height - size1.height) / 2, Math.floor(max.width - size2.width) / 2, Math.floor(max.height - size2.height) / 2 ] }; } $('.image-diff:not([data-image-diff-loaded])').each(async function() { const $container = $(this); $container.attr('data-image-diff-loaded', 'true'); // the container may be hidden by "viewed" checkbox, so use the parent's width for reference const diffContainerWidth = Math.max($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.$images.attr('width', bounds.width); info.$images.attr('height', bounds.height); hideElem(info.$boundsInfo); } } })); const $imagesAfter = imageInfos[0].$images; const $imagesBefore = imageInfos[1].$images; initSideBySide(createContext($imagesAfter[0], $imagesBefore[0])); if ($imagesAfter.length > 0 && $imagesBefore.length > 0) { initSwipe(createContext($imagesAfter[1], $imagesBefore[1])); initOverlay(createContext($imagesAfter[2], $imagesBefore[2])); } $container.find('> .image-diff-tabs').removeClass('is-loading'); function initSideBySide(sizes) { let factor = 1; if (sizes.max.width > (diffContainerWidth - 24) / 2) { factor = (diffContainerWidth - 24) / 2 / sizes.max.width; } const widthChanged = sizes.image1.length !== 0 && sizes.image2.length !== 0 && sizes.image1[0].naturalWidth !== sizes.image2[0].naturalWidth; const heightChanged = sizes.image1.length !== 0 && sizes.image2.length !== 0 && sizes.image1[0].naturalHeight !== sizes.image2[0].naturalHeight; if (sizes.image1.length !== 0) { $container.find('.bounds-info-after .bounds-info-width').text(`${sizes.image1[0].naturalWidth}px`).addClass(widthChanged ? 'green' : ''); $container.find('.bounds-info-after .bounds-info-height').text(`${sizes.image1[0].naturalHeight}px`).addClass(heightChanged ? 'green' : ''); } if (sizes.image2.length !== 0) { $container.find('.bounds-info-before .bounds-info-width').text(`${sizes.image2[0].naturalWidth}px`).addClass(widthChanged ? 'red' : ''); $container.find('.bounds-info-before .bounds-info-height').text(`${sizes.image2[0].naturalHeight}px`).addClass(heightChanged ? 'red' : ''); } sizes.image1.css({ width: sizes.size1.width * factor, height: sizes.size1.height * factor }); sizes.image1.parent().css({ margin: `10px auto`, width: sizes.size1.width * factor + 2, height: sizes.size1.height * factor + 2 }); sizes.image2.css({ width: sizes.size2.width * factor, height: sizes.size2.height * factor }); sizes.image2.parent().css({ margin: `10px auto`, width: sizes.size2.width * factor + 2, height: sizes.size2.height * factor + 2 }); } function initSwipe(sizes) { let factor = 1; if (sizes.max.width > diffContainerWidth - 12) { factor = (diffContainerWidth - 12) / sizes.max.width; } sizes.image1.css({ width: sizes.size1.width * factor, height: sizes.size1.height * factor }); sizes.image1.parent().css({ margin: `0px ${sizes.ratio[0] * factor}px`, width: sizes.size1.width * factor + 2, height: sizes.size1.height * factor + 2 }); sizes.image1.parent().parent().css({ padding: `${sizes.ratio[1] * factor}px 0 0 0`, width: sizes.max.width * factor + 2 }); sizes.image2.css({ width: sizes.size2.width * factor, height: sizes.size2.height * factor }); sizes.image2.parent().css({ margin: `${sizes.ratio[3] * factor}px ${sizes.ratio[2] * factor}px`, width: sizes.size2.width * factor + 2, height: sizes.size2.height * factor + 2 }); sizes.image2.parent().parent().css({ width: sizes.max.width * factor + 2, height: sizes.max.height * factor + 2 }); $container.find('.diff-swipe').css({ width: sizes.max.width * factor + 2, height: sizes.max.height * factor + 30 /* extra height for inner "position: absolute" elements */, }); $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.css({ left: value }); $container.find('.swipe-container').css({ width: $swipeFrame.width() - value }); $(document).on('mouseup.diff-swipe', () => { $(document).off('.diff-swipe'); }); }); }); } function initOverlay(sizes) { let factor = 1; if (sizes.max.width > diffContainerWidth - 12) { factor = (diffContainerWidth - 12) / sizes.max.width; } sizes.image1.css({ width: sizes.size1.width * factor, height: sizes.size1.height * factor }); sizes.image2.css({ width: sizes.size2.width * factor, height: sizes.size2.height * factor }); sizes.image1.parent().css({ margin: `${sizes.ratio[1] * factor}px ${sizes.ratio[0] * factor}px`, width: sizes.size1.width * factor + 2, height: sizes.size1.height * factor + 2 }); sizes.image2.parent().css({ margin: `${sizes.ratio[3] * factor}px ${sizes.ratio[2] * factor}px`, width: sizes.size2.width * factor + 2, height: sizes.size2.height * factor + 2 }); // some inner elements are `position: absolute`, so the container's height must be large enough // the "css(width, height)" is somewhat hacky and not easy to understand, it could be improved in the future sizes.image2.parent().parent().css({ width: sizes.max.width * factor + 2, height: sizes.max.height * factor + 2, }); const $range = $container.find("input[type='range']"); const onInput = () => sizes.image1.parent().css({ opacity: $range.val() / 100 }); $range.on('input', onInput); onInput(); } }); }