diff options
Diffstat (limited to 'web_src/js/features/imagediff.ts')
| -rw-r--r-- | web_src/js/features/imagediff.ts | 284 |
1 files changed, 284 insertions, 0 deletions
diff --git a/web_src/js/features/imagediff.ts b/web_src/js/features/imagediff.ts new file mode 100644 index 0000000000..a6b1f48fb3 --- /dev/null +++ b/web_src/js/features/imagediff.ts @@ -0,0 +1,284 @@ +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 <img> + 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 <img> + 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 + } +} |