587 lines
21 KiB
JavaScript
587 lines
21 KiB
JavaScript
import { getWindow } from 'ssr-window';
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import { elementChildren, elementOffset, elementParents, getTranslate } from '../../shared/utils.js';
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export default function Zoom({
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swiper,
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extendParams,
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on,
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emit
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}) {
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const window = getWindow();
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extendParams({
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zoom: {
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enabled: false,
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maxRatio: 3,
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minRatio: 1,
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toggle: true,
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containerClass: 'swiper-zoom-container',
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zoomedSlideClass: 'swiper-slide-zoomed'
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}
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});
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swiper.zoom = {
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enabled: false
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};
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let currentScale = 1;
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let isScaling = false;
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let fakeGestureTouched;
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let fakeGestureMoved;
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const evCache = [];
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const gesture = {
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originX: 0,
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originY: 0,
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slideEl: undefined,
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slideWidth: undefined,
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slideHeight: undefined,
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imageEl: undefined,
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imageWrapEl: undefined,
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maxRatio: 3
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};
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const image = {
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isTouched: undefined,
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isMoved: undefined,
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currentX: undefined,
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currentY: undefined,
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minX: undefined,
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minY: undefined,
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maxX: undefined,
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maxY: undefined,
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width: undefined,
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height: undefined,
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startX: undefined,
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startY: undefined,
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touchesStart: {},
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touchesCurrent: {}
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};
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const velocity = {
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x: undefined,
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y: undefined,
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prevPositionX: undefined,
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prevPositionY: undefined,
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prevTime: undefined
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};
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let scale = 1;
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Object.defineProperty(swiper.zoom, 'scale', {
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get() {
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return scale;
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},
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set(value) {
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if (scale !== value) {
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const imageEl = gesture.imageEl;
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const slideEl = gesture.slideEl;
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emit('zoomChange', value, imageEl, slideEl);
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}
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scale = value;
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}
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});
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function getDistanceBetweenTouches() {
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if (evCache.length < 2) return 1;
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const x1 = evCache[0].pageX;
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const y1 = evCache[0].pageY;
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const x2 = evCache[1].pageX;
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const y2 = evCache[1].pageY;
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const distance = Math.sqrt((x2 - x1) ** 2 + (y2 - y1) ** 2);
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return distance;
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}
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function getScaleOrigin() {
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if (evCache.length < 2) return {
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x: null,
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y: null
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};
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const box = gesture.imageEl.getBoundingClientRect();
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return [(evCache[0].pageX + (evCache[1].pageX - evCache[0].pageX) / 2 - box.x) / currentScale, (evCache[0].pageY + (evCache[1].pageY - evCache[0].pageY) / 2 - box.y) / currentScale];
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}
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function getSlideSelector() {
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return swiper.isElement ? `swiper-slide` : `.${swiper.params.slideClass}`;
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}
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function eventWithinSlide(e) {
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const slideSelector = getSlideSelector();
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if (e.target.matches(slideSelector)) return true;
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if (swiper.slides.filter(slideEl => slideEl.contains(e.target)).length > 0) return true;
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return false;
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}
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function eventWithinZoomContainer(e) {
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const selector = `.${swiper.params.zoom.containerClass}`;
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if (e.target.matches(selector)) return true;
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if ([...swiper.el.querySelectorAll(selector)].filter(containerEl => containerEl.contains(e.target)).length > 0) return true;
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return false;
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}
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// Events
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function onGestureStart(e) {
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if (e.pointerType === 'mouse') {
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evCache.splice(0, evCache.length);
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}
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if (!eventWithinSlide(e)) return;
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const params = swiper.params.zoom;
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fakeGestureTouched = false;
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fakeGestureMoved = false;
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evCache.push(e);
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if (evCache.length < 2) {
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return;
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}
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fakeGestureTouched = true;
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gesture.scaleStart = getDistanceBetweenTouches();
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if (!gesture.slideEl) {
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gesture.slideEl = e.target.closest(`.${swiper.params.slideClass}, swiper-slide`);
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if (!gesture.slideEl) gesture.slideEl = swiper.slides[swiper.activeIndex];
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let imageEl = gesture.slideEl.querySelector(`.${params.containerClass}`);
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if (imageEl) {
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imageEl = imageEl.querySelectorAll('picture, img, svg, canvas, .swiper-zoom-target')[0];
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}
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gesture.imageEl = imageEl;
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if (imageEl) {
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gesture.imageWrapEl = elementParents(gesture.imageEl, `.${params.containerClass}`)[0];
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} else {
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gesture.imageWrapEl = undefined;
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}
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if (!gesture.imageWrapEl) {
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gesture.imageEl = undefined;
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return;
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}
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gesture.maxRatio = gesture.imageWrapEl.getAttribute('data-swiper-zoom') || params.maxRatio;
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}
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if (gesture.imageEl) {
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const [originX, originY] = getScaleOrigin();
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gesture.originX = originX;
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gesture.originY = originY;
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gesture.imageEl.style.transitionDuration = '0ms';
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}
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isScaling = true;
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}
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function onGestureChange(e) {
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if (!eventWithinSlide(e)) return;
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const params = swiper.params.zoom;
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const zoom = swiper.zoom;
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const pointerIndex = evCache.findIndex(cachedEv => cachedEv.pointerId === e.pointerId);
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if (pointerIndex >= 0) evCache[pointerIndex] = e;
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if (evCache.length < 2) {
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return;
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}
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fakeGestureMoved = true;
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gesture.scaleMove = getDistanceBetweenTouches();
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if (!gesture.imageEl) {
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return;
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}
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zoom.scale = gesture.scaleMove / gesture.scaleStart * currentScale;
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if (zoom.scale > gesture.maxRatio) {
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zoom.scale = gesture.maxRatio - 1 + (zoom.scale - gesture.maxRatio + 1) ** 0.5;
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}
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if (zoom.scale < params.minRatio) {
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zoom.scale = params.minRatio + 1 - (params.minRatio - zoom.scale + 1) ** 0.5;
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}
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gesture.imageEl.style.transform = `translate3d(0,0,0) scale(${zoom.scale})`;
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}
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function onGestureEnd(e) {
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if (!eventWithinSlide(e)) return;
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if (e.pointerType === 'mouse' && e.type === 'pointerout') return;
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const params = swiper.params.zoom;
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const zoom = swiper.zoom;
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const pointerIndex = evCache.findIndex(cachedEv => cachedEv.pointerId === e.pointerId);
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if (pointerIndex >= 0) evCache.splice(pointerIndex, 1);
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if (!fakeGestureTouched || !fakeGestureMoved) {
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return;
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}
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fakeGestureTouched = false;
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fakeGestureMoved = false;
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if (!gesture.imageEl) return;
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zoom.scale = Math.max(Math.min(zoom.scale, gesture.maxRatio), params.minRatio);
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gesture.imageEl.style.transitionDuration = `${swiper.params.speed}ms`;
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gesture.imageEl.style.transform = `translate3d(0,0,0) scale(${zoom.scale})`;
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currentScale = zoom.scale;
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isScaling = false;
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if (zoom.scale > 1 && gesture.slideEl) {
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gesture.slideEl.classList.add(`${params.zoomedSlideClass}`);
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} else if (zoom.scale <= 1 && gesture.slideEl) {
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gesture.slideEl.classList.remove(`${params.zoomedSlideClass}`);
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}
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if (zoom.scale === 1) {
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gesture.originX = 0;
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gesture.originY = 0;
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gesture.slideEl = undefined;
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}
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}
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function onTouchStart(e) {
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const device = swiper.device;
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if (!gesture.imageEl) return;
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if (image.isTouched) return;
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if (device.android && e.cancelable) e.preventDefault();
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image.isTouched = true;
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const event = evCache.length > 0 ? evCache[0] : e;
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image.touchesStart.x = event.pageX;
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image.touchesStart.y = event.pageY;
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}
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function onTouchMove(e) {
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if (!eventWithinSlide(e) || !eventWithinZoomContainer(e)) return;
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const zoom = swiper.zoom;
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if (!gesture.imageEl) return;
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if (!image.isTouched || !gesture.slideEl) return;
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if (!image.isMoved) {
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image.width = gesture.imageEl.offsetWidth;
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image.height = gesture.imageEl.offsetHeight;
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image.startX = getTranslate(gesture.imageWrapEl, 'x') || 0;
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image.startY = getTranslate(gesture.imageWrapEl, 'y') || 0;
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gesture.slideWidth = gesture.slideEl.offsetWidth;
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gesture.slideHeight = gesture.slideEl.offsetHeight;
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gesture.imageWrapEl.style.transitionDuration = '0ms';
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}
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// Define if we need image drag
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const scaledWidth = image.width * zoom.scale;
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const scaledHeight = image.height * zoom.scale;
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if (scaledWidth < gesture.slideWidth && scaledHeight < gesture.slideHeight) return;
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image.minX = Math.min(gesture.slideWidth / 2 - scaledWidth / 2, 0);
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image.maxX = -image.minX;
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image.minY = Math.min(gesture.slideHeight / 2 - scaledHeight / 2, 0);
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image.maxY = -image.minY;
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image.touchesCurrent.x = evCache.length > 0 ? evCache[0].pageX : e.pageX;
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image.touchesCurrent.y = evCache.length > 0 ? evCache[0].pageY : e.pageY;
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const touchesDiff = Math.max(Math.abs(image.touchesCurrent.x - image.touchesStart.x), Math.abs(image.touchesCurrent.y - image.touchesStart.y));
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if (touchesDiff > 5) {
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swiper.allowClick = false;
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}
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if (!image.isMoved && !isScaling) {
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if (swiper.isHorizontal() && (Math.floor(image.minX) === Math.floor(image.startX) && image.touchesCurrent.x < image.touchesStart.x || Math.floor(image.maxX) === Math.floor(image.startX) && image.touchesCurrent.x > image.touchesStart.x)) {
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image.isTouched = false;
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return;
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}
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if (!swiper.isHorizontal() && (Math.floor(image.minY) === Math.floor(image.startY) && image.touchesCurrent.y < image.touchesStart.y || Math.floor(image.maxY) === Math.floor(image.startY) && image.touchesCurrent.y > image.touchesStart.y)) {
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image.isTouched = false;
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return;
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}
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}
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if (e.cancelable) {
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e.preventDefault();
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}
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e.stopPropagation();
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image.isMoved = true;
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const scaleRatio = (zoom.scale - currentScale) / (gesture.maxRatio - swiper.params.zoom.minRatio);
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const {
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originX,
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originY
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} = gesture;
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image.currentX = image.touchesCurrent.x - image.touchesStart.x + image.startX + scaleRatio * (image.width - originX * 2);
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image.currentY = image.touchesCurrent.y - image.touchesStart.y + image.startY + scaleRatio * (image.height - originY * 2);
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if (image.currentX < image.minX) {
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image.currentX = image.minX + 1 - (image.minX - image.currentX + 1) ** 0.8;
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}
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if (image.currentX > image.maxX) {
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image.currentX = image.maxX - 1 + (image.currentX - image.maxX + 1) ** 0.8;
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}
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if (image.currentY < image.minY) {
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image.currentY = image.minY + 1 - (image.minY - image.currentY + 1) ** 0.8;
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}
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if (image.currentY > image.maxY) {
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image.currentY = image.maxY - 1 + (image.currentY - image.maxY + 1) ** 0.8;
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}
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// Velocity
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if (!velocity.prevPositionX) velocity.prevPositionX = image.touchesCurrent.x;
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if (!velocity.prevPositionY) velocity.prevPositionY = image.touchesCurrent.y;
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if (!velocity.prevTime) velocity.prevTime = Date.now();
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velocity.x = (image.touchesCurrent.x - velocity.prevPositionX) / (Date.now() - velocity.prevTime) / 2;
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velocity.y = (image.touchesCurrent.y - velocity.prevPositionY) / (Date.now() - velocity.prevTime) / 2;
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if (Math.abs(image.touchesCurrent.x - velocity.prevPositionX) < 2) velocity.x = 0;
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if (Math.abs(image.touchesCurrent.y - velocity.prevPositionY) < 2) velocity.y = 0;
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velocity.prevPositionX = image.touchesCurrent.x;
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velocity.prevPositionY = image.touchesCurrent.y;
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velocity.prevTime = Date.now();
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gesture.imageWrapEl.style.transform = `translate3d(${image.currentX}px, ${image.currentY}px,0)`;
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}
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function onTouchEnd() {
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const zoom = swiper.zoom;
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if (!gesture.imageEl) return;
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if (!image.isTouched || !image.isMoved) {
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image.isTouched = false;
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image.isMoved = false;
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return;
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}
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image.isTouched = false;
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image.isMoved = false;
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let momentumDurationX = 300;
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let momentumDurationY = 300;
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const momentumDistanceX = velocity.x * momentumDurationX;
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const newPositionX = image.currentX + momentumDistanceX;
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const momentumDistanceY = velocity.y * momentumDurationY;
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const newPositionY = image.currentY + momentumDistanceY;
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// Fix duration
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if (velocity.x !== 0) momentumDurationX = Math.abs((newPositionX - image.currentX) / velocity.x);
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if (velocity.y !== 0) momentumDurationY = Math.abs((newPositionY - image.currentY) / velocity.y);
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const momentumDuration = Math.max(momentumDurationX, momentumDurationY);
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image.currentX = newPositionX;
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image.currentY = newPositionY;
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// Define if we need image drag
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const scaledWidth = image.width * zoom.scale;
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const scaledHeight = image.height * zoom.scale;
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image.minX = Math.min(gesture.slideWidth / 2 - scaledWidth / 2, 0);
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image.maxX = -image.minX;
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image.minY = Math.min(gesture.slideHeight / 2 - scaledHeight / 2, 0);
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image.maxY = -image.minY;
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image.currentX = Math.max(Math.min(image.currentX, image.maxX), image.minX);
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image.currentY = Math.max(Math.min(image.currentY, image.maxY), image.minY);
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gesture.imageWrapEl.style.transitionDuration = `${momentumDuration}ms`;
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gesture.imageWrapEl.style.transform = `translate3d(${image.currentX}px, ${image.currentY}px,0)`;
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}
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function onTransitionEnd() {
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const zoom = swiper.zoom;
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if (gesture.slideEl && swiper.activeIndex !== swiper.slides.indexOf(gesture.slideEl)) {
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if (gesture.imageEl) {
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gesture.imageEl.style.transform = 'translate3d(0,0,0) scale(1)';
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}
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if (gesture.imageWrapEl) {
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gesture.imageWrapEl.style.transform = 'translate3d(0,0,0)';
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}
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gesture.slideEl.classList.remove(`${swiper.params.zoom.zoomedSlideClass}`);
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zoom.scale = 1;
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currentScale = 1;
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gesture.slideEl = undefined;
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gesture.imageEl = undefined;
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gesture.imageWrapEl = undefined;
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gesture.originX = 0;
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gesture.originY = 0;
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}
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}
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function zoomIn(e) {
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const zoom = swiper.zoom;
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const params = swiper.params.zoom;
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if (!gesture.slideEl) {
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if (e && e.target) {
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gesture.slideEl = e.target.closest(`.${swiper.params.slideClass}, swiper-slide`);
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}
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if (!gesture.slideEl) {
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if (swiper.params.virtual && swiper.params.virtual.enabled && swiper.virtual) {
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gesture.slideEl = elementChildren(swiper.slidesEl, `.${swiper.params.slideActiveClass}`)[0];
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} else {
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gesture.slideEl = swiper.slides[swiper.activeIndex];
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}
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}
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let imageEl = gesture.slideEl.querySelector(`.${params.containerClass}`);
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if (imageEl) {
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imageEl = imageEl.querySelectorAll('picture, img, svg, canvas, .swiper-zoom-target')[0];
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}
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gesture.imageEl = imageEl;
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if (imageEl) {
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gesture.imageWrapEl = elementParents(gesture.imageEl, `.${params.containerClass}`)[0];
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} else {
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gesture.imageWrapEl = undefined;
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}
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}
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if (!gesture.imageEl || !gesture.imageWrapEl) return;
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if (swiper.params.cssMode) {
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swiper.wrapperEl.style.overflow = 'hidden';
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swiper.wrapperEl.style.touchAction = 'none';
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}
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gesture.slideEl.classList.add(`${params.zoomedSlideClass}`);
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let touchX;
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let touchY;
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let offsetX;
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let offsetY;
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let diffX;
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let diffY;
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let translateX;
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let translateY;
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let imageWidth;
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let imageHeight;
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let scaledWidth;
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let scaledHeight;
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let translateMinX;
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let translateMinY;
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let translateMaxX;
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let translateMaxY;
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let slideWidth;
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let slideHeight;
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if (typeof image.touchesStart.x === 'undefined' && e) {
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touchX = e.pageX;
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touchY = e.pageY;
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} else {
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touchX = image.touchesStart.x;
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touchY = image.touchesStart.y;
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}
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const forceZoomRatio = typeof e === 'number' ? e : null;
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if (currentScale === 1 && forceZoomRatio) {
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touchX = undefined;
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touchY = undefined;
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}
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zoom.scale = forceZoomRatio || gesture.imageWrapEl.getAttribute('data-swiper-zoom') || params.maxRatio;
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currentScale = forceZoomRatio || gesture.imageWrapEl.getAttribute('data-swiper-zoom') || params.maxRatio;
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if (e && !(currentScale === 1 && forceZoomRatio)) {
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slideWidth = gesture.slideEl.offsetWidth;
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slideHeight = gesture.slideEl.offsetHeight;
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offsetX = elementOffset(gesture.slideEl).left + window.scrollX;
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offsetY = elementOffset(gesture.slideEl).top + window.scrollY;
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diffX = offsetX + slideWidth / 2 - touchX;
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diffY = offsetY + slideHeight / 2 - touchY;
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imageWidth = gesture.imageEl.offsetWidth;
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imageHeight = gesture.imageEl.offsetHeight;
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scaledWidth = imageWidth * zoom.scale;
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scaledHeight = imageHeight * zoom.scale;
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translateMinX = Math.min(slideWidth / 2 - scaledWidth / 2, 0);
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translateMinY = Math.min(slideHeight / 2 - scaledHeight / 2, 0);
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translateMaxX = -translateMinX;
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translateMaxY = -translateMinY;
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translateX = diffX * zoom.scale;
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translateY = diffY * zoom.scale;
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if (translateX < translateMinX) {
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translateX = translateMinX;
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}
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if (translateX > translateMaxX) {
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translateX = translateMaxX;
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}
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if (translateY < translateMinY) {
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translateY = translateMinY;
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}
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if (translateY > translateMaxY) {
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translateY = translateMaxY;
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}
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} else {
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translateX = 0;
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translateY = 0;
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|
}
|
|
if (forceZoomRatio && zoom.scale === 1) {
|
|
gesture.originX = 0;
|
|
gesture.originY = 0;
|
|
}
|
|
gesture.imageWrapEl.style.transitionDuration = '300ms';
|
|
gesture.imageWrapEl.style.transform = `translate3d(${translateX}px, ${translateY}px,0)`;
|
|
gesture.imageEl.style.transitionDuration = '300ms';
|
|
gesture.imageEl.style.transform = `translate3d(0,0,0) scale(${zoom.scale})`;
|
|
}
|
|
function zoomOut() {
|
|
const zoom = swiper.zoom;
|
|
const params = swiper.params.zoom;
|
|
if (!gesture.slideEl) {
|
|
if (swiper.params.virtual && swiper.params.virtual.enabled && swiper.virtual) {
|
|
gesture.slideEl = elementChildren(swiper.slidesEl, `.${swiper.params.slideActiveClass}`)[0];
|
|
} else {
|
|
gesture.slideEl = swiper.slides[swiper.activeIndex];
|
|
}
|
|
let imageEl = gesture.slideEl.querySelector(`.${params.containerClass}`);
|
|
if (imageEl) {
|
|
imageEl = imageEl.querySelectorAll('picture, img, svg, canvas, .swiper-zoom-target')[0];
|
|
}
|
|
gesture.imageEl = imageEl;
|
|
if (imageEl) {
|
|
gesture.imageWrapEl = elementParents(gesture.imageEl, `.${params.containerClass}`)[0];
|
|
} else {
|
|
gesture.imageWrapEl = undefined;
|
|
}
|
|
}
|
|
if (!gesture.imageEl || !gesture.imageWrapEl) return;
|
|
if (swiper.params.cssMode) {
|
|
swiper.wrapperEl.style.overflow = '';
|
|
swiper.wrapperEl.style.touchAction = '';
|
|
}
|
|
zoom.scale = 1;
|
|
currentScale = 1;
|
|
gesture.imageWrapEl.style.transitionDuration = '300ms';
|
|
gesture.imageWrapEl.style.transform = 'translate3d(0,0,0)';
|
|
gesture.imageEl.style.transitionDuration = '300ms';
|
|
gesture.imageEl.style.transform = 'translate3d(0,0,0) scale(1)';
|
|
gesture.slideEl.classList.remove(`${params.zoomedSlideClass}`);
|
|
gesture.slideEl = undefined;
|
|
gesture.originX = 0;
|
|
gesture.originY = 0;
|
|
}
|
|
|
|
// Toggle Zoom
|
|
function zoomToggle(e) {
|
|
const zoom = swiper.zoom;
|
|
if (zoom.scale && zoom.scale !== 1) {
|
|
// Zoom Out
|
|
zoomOut();
|
|
} else {
|
|
// Zoom In
|
|
zoomIn(e);
|
|
}
|
|
}
|
|
function getListeners() {
|
|
const passiveListener = swiper.params.passiveListeners ? {
|
|
passive: true,
|
|
capture: false
|
|
} : false;
|
|
const activeListenerWithCapture = swiper.params.passiveListeners ? {
|
|
passive: false,
|
|
capture: true
|
|
} : true;
|
|
return {
|
|
passiveListener,
|
|
activeListenerWithCapture
|
|
};
|
|
}
|
|
|
|
// Attach/Detach Events
|
|
function enable() {
|
|
const zoom = swiper.zoom;
|
|
if (zoom.enabled) return;
|
|
zoom.enabled = true;
|
|
const {
|
|
passiveListener,
|
|
activeListenerWithCapture
|
|
} = getListeners();
|
|
|
|
// Scale image
|
|
swiper.wrapperEl.addEventListener('pointerdown', onGestureStart, passiveListener);
|
|
swiper.wrapperEl.addEventListener('pointermove', onGestureChange, activeListenerWithCapture);
|
|
['pointerup', 'pointercancel', 'pointerout'].forEach(eventName => {
|
|
swiper.wrapperEl.addEventListener(eventName, onGestureEnd, passiveListener);
|
|
});
|
|
|
|
// Move image
|
|
swiper.wrapperEl.addEventListener('pointermove', onTouchMove, activeListenerWithCapture);
|
|
}
|
|
function disable() {
|
|
const zoom = swiper.zoom;
|
|
if (!zoom.enabled) return;
|
|
zoom.enabled = false;
|
|
const {
|
|
passiveListener,
|
|
activeListenerWithCapture
|
|
} = getListeners();
|
|
|
|
// Scale image
|
|
swiper.wrapperEl.removeEventListener('pointerdown', onGestureStart, passiveListener);
|
|
swiper.wrapperEl.removeEventListener('pointermove', onGestureChange, activeListenerWithCapture);
|
|
['pointerup', 'pointercancel', 'pointerout'].forEach(eventName => {
|
|
swiper.wrapperEl.removeEventListener(eventName, onGestureEnd, passiveListener);
|
|
});
|
|
|
|
// Move image
|
|
swiper.wrapperEl.removeEventListener('pointermove', onTouchMove, activeListenerWithCapture);
|
|
}
|
|
on('init', () => {
|
|
if (swiper.params.zoom.enabled) {
|
|
enable();
|
|
}
|
|
});
|
|
on('destroy', () => {
|
|
disable();
|
|
});
|
|
on('touchStart', (_s, e) => {
|
|
if (!swiper.zoom.enabled) return;
|
|
onTouchStart(e);
|
|
});
|
|
on('touchEnd', (_s, e) => {
|
|
if (!swiper.zoom.enabled) return;
|
|
onTouchEnd(e);
|
|
});
|
|
on('doubleTap', (_s, e) => {
|
|
if (!swiper.animating && swiper.params.zoom.enabled && swiper.zoom.enabled && swiper.params.zoom.toggle) {
|
|
zoomToggle(e);
|
|
}
|
|
});
|
|
on('transitionEnd', () => {
|
|
if (swiper.zoom.enabled && swiper.params.zoom.enabled) {
|
|
onTransitionEnd();
|
|
}
|
|
});
|
|
on('slideChange', () => {
|
|
if (swiper.zoom.enabled && swiper.params.zoom.enabled && swiper.params.cssMode) {
|
|
onTransitionEnd();
|
|
}
|
|
});
|
|
Object.assign(swiper.zoom, {
|
|
enable,
|
|
disable,
|
|
in: zoomIn,
|
|
out: zoomOut,
|
|
toggle: zoomToggle
|
|
});
|
|
} |