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Diffstat (limited to '')
| -rw-r--r-- | web_src/js/features/imagediff.js | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/web_src/js/features/imagediff.js b/web_src/js/features/imagediff.js new file mode 100644 index 0000000..d1b139f --- /dev/null +++ b/web_src/js/features/imagediff.js @@ -0,0 +1,271 @@ +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(); + } + }); +} |