初始提交: Gitea 项目代码
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import {GET} from '../modules/fetch.ts';
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import {hideElem, loadElem, queryElemChildren, queryElems} from '../utils/dom.ts';
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import {parseDom} from '../utils.ts';
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type ImageContext = {
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imageBefore: HTMLImageElement | undefined,
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imageAfter: HTMLImageElement | undefined,
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sizeBefore: {width: number, height: number},
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sizeAfter: {width: number, height: number},
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maxSize: {width: number, height: number},
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ratio: [number, number, number, number],
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};
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type ImageInfo = {
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path: string | null,
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mime: string | null,
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images: NodeListOf<HTMLImageElement>,
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boundsInfo: HTMLElement | null,
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};
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type Bounds = {
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width: number,
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height: number,
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} | null;
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type SvgBoundsInfo = {
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before: Bounds,
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after: Bounds,
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};
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function getDefaultSvgBoundsIfUndefined(text: string, src: string): Bounds | null {
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const defaultSize = 300;
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const maxSize = 99999;
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const svgDoc = parseDom(text, 'image/svg+xml');
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const svg = (svgDoc.documentElement as unknown) as SVGSVGElement;
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const width = svg?.width?.baseVal;
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const height = svg?.height?.baseVal;
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if (width === undefined || height === undefined) {
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return null; // in case some svg is invalid or doesn't have the width/height
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}
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if (width.unitType === SVGLength.SVG_LENGTHTYPE_PERCENTAGE || height.unitType === SVGLength.SVG_LENGTHTYPE_PERCENTAGE) {
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const img = new Image();
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img.src = src;
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if (img.width > 1 && img.width < maxSize && img.height > 1 && img.height < maxSize) {
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return {
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width: img.width,
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height: img.height,
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};
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}
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if (svg.hasAttribute('viewBox')) {
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const viewBox = svg.viewBox.baseVal;
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return {
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width: defaultSize,
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height: defaultSize * viewBox.height / viewBox.width,
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};
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}
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return {
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width: defaultSize,
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height: defaultSize,
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};
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}
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return null;
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}
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function createContext(imageAfter: HTMLImageElement, imageBefore: HTMLImageElement, svgBoundsInfo: SvgBoundsInfo): ImageContext {
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const sizeAfter = {
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width: svgBoundsInfo.after?.width || imageAfter?.width || 0,
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height: svgBoundsInfo.after?.height || imageAfter?.height || 0,
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};
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const sizeBefore = {
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width: svgBoundsInfo.before?.width || imageBefore?.width || 0,
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height: svgBoundsInfo.before?.height || imageBefore?.height || 0,
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};
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const maxSize = {
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width: Math.max(sizeBefore.width, sizeAfter.width),
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height: Math.max(sizeBefore.height, sizeAfter.height),
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};
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return {
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imageAfter,
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imageBefore,
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sizeAfter,
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sizeBefore,
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maxSize,
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ratio: [
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Math.floor(maxSize.width - sizeAfter.width) / 2,
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Math.floor(maxSize.height - sizeAfter.height) / 2,
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Math.floor(maxSize.width - sizeBefore.width) / 2,
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Math.floor(maxSize.height - sizeBefore.height) / 2,
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],
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};
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}
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class ImageDiff {
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containerEl!: HTMLElement;
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diffContainerWidth!: number;
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async init(containerEl: HTMLElement) {
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this.containerEl = containerEl;
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containerEl.setAttribute('data-image-diff-loaded', 'true');
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// the container may be hidden by "viewed" checkbox, so use the parent's width for reference
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this.diffContainerWidth = Math.max(containerEl.closest('.diff-file-box')!.clientWidth - 300, 100);
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const imagePair: [ImageInfo, ImageInfo] = [{
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path: containerEl.getAttribute('data-path-after'),
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mime: containerEl.getAttribute('data-mime-after'),
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images: containerEl.querySelectorAll<HTMLImageElement>('img.image-after'), // matches 3 <img>
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boundsInfo: containerEl.querySelector('.bounds-info-after'),
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}, {
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path: containerEl.getAttribute('data-path-before'),
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mime: containerEl.getAttribute('data-mime-before'),
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images: containerEl.querySelectorAll<HTMLImageElement>('img.image-before'), // matches 3 <img>
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boundsInfo: containerEl.querySelector('.bounds-info-before'),
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}];
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const svgBoundsInfo: SvgBoundsInfo = {before: null, after: null};
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await Promise.all(imagePair.map(async (info, index) => {
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const [success] = await Promise.all(Array.from(info.images, (img) => {
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return loadElem(img, info.path!);
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}));
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// only the first images is associated with boundsInfo
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if (!success && info.boundsInfo) info.boundsInfo.textContent = '(image error)';
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if (info.mime === 'image/svg+xml') {
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const resp = await GET(info.path!);
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const text = await resp.text();
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const bounds = getDefaultSvgBoundsIfUndefined(text, info.path!);
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svgBoundsInfo[index === 0 ? 'after' : 'before'] = bounds;
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if (bounds) {
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hideElem(info.boundsInfo!);
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}
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}
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}));
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const imagesAfter = imagePair[0].images;
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const imagesBefore = imagePair[1].images;
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this.initSideBySide(createContext(imagesAfter[0], imagesBefore[0], svgBoundsInfo));
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if (imagesAfter.length > 0 && imagesBefore.length > 0) {
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this.initSwipe(createContext(imagesAfter[1], imagesBefore[1], svgBoundsInfo));
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this.initOverlay(createContext(imagesAfter[2], imagesBefore[2], svgBoundsInfo));
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}
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queryElemChildren(containerEl, '.image-diff-tabs', (el) => el.classList.remove('is-loading'));
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}
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initSideBySide(ctx: ImageContext) {
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let factor = 1;
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if (ctx.maxSize.width > (this.diffContainerWidth - 24) / 2) {
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factor = (this.diffContainerWidth - 24) / 2 / ctx.maxSize.width;
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}
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const widthChanged = ctx.imageAfter && ctx.imageBefore && ctx.imageAfter.naturalWidth !== ctx.imageBefore.naturalWidth;
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const heightChanged = ctx.imageAfter && ctx.imageBefore && ctx.imageAfter.naturalHeight !== ctx.imageBefore.naturalHeight;
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if (ctx.imageAfter) {
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const boundsInfoAfterWidth = this.containerEl.querySelector('.bounds-info-after .bounds-info-width');
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if (boundsInfoAfterWidth) {
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boundsInfoAfterWidth.textContent = `${ctx.imageAfter.naturalWidth}px`;
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boundsInfoAfterWidth.classList.toggle('green', widthChanged);
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}
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const boundsInfoAfterHeight = this.containerEl.querySelector('.bounds-info-after .bounds-info-height');
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if (boundsInfoAfterHeight) {
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boundsInfoAfterHeight.textContent = `${ctx.imageAfter.naturalHeight}px`;
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boundsInfoAfterHeight.classList.toggle('green', heightChanged);
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}
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}
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if (ctx.imageBefore) {
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const boundsInfoBeforeWidth = this.containerEl.querySelector('.bounds-info-before .bounds-info-width');
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if (boundsInfoBeforeWidth) {
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boundsInfoBeforeWidth.textContent = `${ctx.imageBefore.naturalWidth}px`;
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boundsInfoBeforeWidth.classList.toggle('red', widthChanged);
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}
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const boundsInfoBeforeHeight = this.containerEl.querySelector('.bounds-info-before .bounds-info-height');
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if (boundsInfoBeforeHeight) {
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boundsInfoBeforeHeight.textContent = `${ctx.imageBefore.naturalHeight}px`;
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boundsInfoBeforeHeight.classList.toggle('red', heightChanged);
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}
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}
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if (ctx.imageAfter) {
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const container = ctx.imageAfter.parentNode as HTMLElement;
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ctx.imageAfter.style.width = `${ctx.sizeAfter.width * factor}px`;
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ctx.imageAfter.style.height = `${ctx.sizeAfter.height * factor}px`;
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container.style.margin = '10px auto';
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container.style.width = `${ctx.sizeAfter.width * factor + 2}px`;
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container.style.height = `${ctx.sizeAfter.height * factor + 2}px`;
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}
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if (ctx.imageBefore) {
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const container = ctx.imageBefore.parentNode as HTMLElement;
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ctx.imageBefore.style.width = `${ctx.sizeBefore.width * factor}px`;
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ctx.imageBefore.style.height = `${ctx.sizeBefore.height * factor}px`;
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container.style.margin = '10px auto';
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container.style.width = `${ctx.sizeBefore.width * factor + 2}px`;
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container.style.height = `${ctx.sizeBefore.height * factor + 2}px`;
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}
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}
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initSwipe(ctx: ImageContext) {
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let factor = 1;
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if (ctx.maxSize.width > this.diffContainerWidth - 12) {
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factor = (this.diffContainerWidth - 12) / ctx.maxSize.width;
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}
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if (ctx.imageAfter) {
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const imgParent = ctx.imageAfter.parentNode as HTMLElement;
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const swipeFrame = imgParent.parentNode as HTMLElement;
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ctx.imageAfter.style.width = `${ctx.sizeAfter.width * factor}px`;
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ctx.imageAfter.style.height = `${ctx.sizeAfter.height * factor}px`;
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imgParent.style.margin = `0px ${ctx.ratio[0] * factor}px`;
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imgParent.style.width = `${ctx.sizeAfter.width * factor + 2}px`;
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imgParent.style.height = `${ctx.sizeAfter.height * factor + 2}px`;
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swipeFrame.style.padding = `${ctx.ratio[1] * factor}px 0 0 0`;
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swipeFrame.style.width = `${ctx.maxSize.width * factor + 2}px`;
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}
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if (ctx.imageBefore) {
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const imgParent = ctx.imageBefore.parentNode as HTMLElement;
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const swipeFrame = imgParent.parentNode as HTMLElement;
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ctx.imageBefore.style.width = `${ctx.sizeBefore.width * factor}px`;
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ctx.imageBefore.style.height = `${ctx.sizeBefore.height * factor}px`;
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imgParent.style.margin = `${ctx.ratio[3] * factor}px ${ctx.ratio[2] * factor}px`;
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imgParent.style.width = `${ctx.sizeBefore.width * factor + 2}px`;
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imgParent.style.height = `${ctx.sizeBefore.height * factor + 2}px`;
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swipeFrame.style.width = `${ctx.maxSize.width * factor + 2}px`;
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swipeFrame.style.height = `${ctx.maxSize.height * factor + 2}px`;
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}
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// extra height for inner "position: absolute" elements
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const swipe = this.containerEl.querySelector<HTMLElement>('.diff-swipe');
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if (swipe) {
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swipe.style.width = `${ctx.maxSize.width * factor + 2}px`;
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swipe.style.height = `${ctx.maxSize.height * factor + 30}px`;
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}
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this.containerEl.querySelector('.swipe-bar')!.addEventListener('mousedown', (e) => {
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e.preventDefault();
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this.initSwipeEventListeners(e.currentTarget as HTMLElement);
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});
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}
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initSwipeEventListeners(swipeBar: HTMLElement) {
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const swipeFrame = swipeBar.parentNode as HTMLElement;
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const width = swipeFrame.clientWidth;
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const onSwipeMouseMove = (e: MouseEvent) => {
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e.preventDefault();
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const rect = swipeFrame.getBoundingClientRect();
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const value = Math.max(0, Math.min(e.clientX - rect.left, width));
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swipeBar.style.left = `${value}px`;
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this.containerEl.querySelector<HTMLElement>('.swipe-container')!.style.width = `${swipeFrame.clientWidth - value}px`;
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};
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const removeEventListeners = () => {
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document.removeEventListener('mousemove', onSwipeMouseMove);
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document.removeEventListener('mouseup', removeEventListeners);
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};
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document.addEventListener('mousemove', onSwipeMouseMove);
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document.addEventListener('mouseup', removeEventListeners);
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}
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initOverlay(ctx: ImageContext) {
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let factor = 1;
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if (ctx.maxSize.width > this.diffContainerWidth - 12) {
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factor = (this.diffContainerWidth - 12) / ctx.maxSize.width;
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}
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if (ctx.imageAfter) {
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const container = ctx.imageAfter.parentNode as HTMLElement;
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ctx.imageAfter.style.width = `${ctx.sizeAfter.width * factor}px`;
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ctx.imageAfter.style.height = `${ctx.sizeAfter.height * factor}px`;
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container.style.margin = `${ctx.ratio[1] * factor}px ${ctx.ratio[0] * factor}px`;
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container.style.width = `${ctx.sizeAfter.width * factor + 2}px`;
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container.style.height = `${ctx.sizeAfter.height * factor + 2}px`;
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}
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if (ctx.imageBefore) {
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const container = ctx.imageBefore.parentNode as HTMLElement;
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const overlayFrame = container.parentNode as HTMLElement;
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ctx.imageBefore.style.width = `${ctx.sizeBefore.width * factor}px`;
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ctx.imageBefore.style.height = `${ctx.sizeBefore.height * factor}px`;
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container.style.margin = `${ctx.ratio[3] * factor}px ${ctx.ratio[2] * factor}px`;
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container.style.width = `${ctx.sizeBefore.width * factor + 2}px`;
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container.style.height = `${ctx.sizeBefore.height * factor + 2}px`;
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// some inner elements are `position: absolute`, so the container's height must be large enough
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overlayFrame.style.width = `${ctx.maxSize.width * factor + 2}px`;
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overlayFrame.style.height = `${ctx.maxSize.height * factor + 2}px`;
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}
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const rangeInput = this.containerEl.querySelector<HTMLInputElement>('input[type="range"]')!;
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function updateOpacity() {
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if (ctx.imageAfter) {
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(ctx.imageAfter.parentNode as HTMLElement).style.opacity = `${Number(rangeInput.value) / 100}`;
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}
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}
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rangeInput?.addEventListener('input', updateOpacity);
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updateOpacity();
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}
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}
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export function initImageDiff() {
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for (const el of queryElems<HTMLImageElement>(document, '.image-diff:not([data-image-diff-loaded])')) {
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(new ImageDiff()).init(el); // it is async, but we don't need to await for it
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}
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}
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