import $ from '../../utils/dom';
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import Utils from '../../utils/utils';
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import Device from '../../utils/device';
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import Support from '../../utils/support';
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const Zoom = {
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// Calc Scale From Multi-touches
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getDistanceBetweenTouches(e) {
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if (e.targetTouches.length < 2) return 1;
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const x1 = e.targetTouches[0].pageX;
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const y1 = e.targetTouches[0].pageY;
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const x2 = e.targetTouches[1].pageX;
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const y2 = e.targetTouches[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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// Events
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onGestureStart(e) {
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const swiper = this;
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const params = swiper.params.zoom;
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const zoom = swiper.zoom;
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const { gesture } = zoom;
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zoom.fakeGestureTouched = false;
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zoom.fakeGestureMoved = false;
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if (!Support.gestures) {
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if (e.type !== 'touchstart' || (e.type === 'touchstart' && e.targetTouches.length < 2)) {
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return;
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}
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zoom.fakeGestureTouched = true;
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gesture.scaleStart = Zoom.getDistanceBetweenTouches(e);
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}
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if (!gesture.$slideEl || !gesture.$slideEl.length) {
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gesture.$slideEl = $(e.target).closest(`.${swiper.params.slideClass}`);
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if (gesture.$slideEl.length === 0) gesture.$slideEl = swiper.slides.eq(swiper.activeIndex);
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gesture.$imageEl = gesture.$slideEl.find('img, svg, canvas, picture, .swiper-zoom-target');
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gesture.$imageWrapEl = gesture.$imageEl.parent(`.${params.containerClass}`);
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gesture.maxRatio = gesture.$imageWrapEl.attr('data-swiper-zoom') || params.maxRatio;
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if (gesture.$imageWrapEl.length === 0) {
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gesture.$imageEl = undefined;
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return;
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}
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}
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if (gesture.$imageEl) {
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gesture.$imageEl.transition(0);
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}
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swiper.zoom.isScaling = true;
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},
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onGestureChange(e) {
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const swiper = this;
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const params = swiper.params.zoom;
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const zoom = swiper.zoom;
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const { gesture } = zoom;
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if (!Support.gestures) {
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if (e.type !== 'touchmove' || (e.type === 'touchmove' && e.targetTouches.length < 2)) {
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return;
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}
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zoom.fakeGestureMoved = true;
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gesture.scaleMove = Zoom.getDistanceBetweenTouches(e);
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}
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if (!gesture.$imageEl || gesture.$imageEl.length === 0) return;
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if (Support.gestures) {
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zoom.scale = e.scale * zoom.currentScale;
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} else {
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zoom.scale = (gesture.scaleMove / gesture.scaleStart) * zoom.currentScale;
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}
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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.$imageEl.transform(`translate3d(0,0,0) scale(${zoom.scale})`);
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},
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onGestureEnd(e) {
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const swiper = this;
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const params = swiper.params.zoom;
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const zoom = swiper.zoom;
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const { gesture } = zoom;
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if (!Support.gestures) {
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if (!zoom.fakeGestureTouched || !zoom.fakeGestureMoved) {
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return;
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}
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if (e.type !== 'touchend' || (e.type === 'touchend' && e.changedTouches.length < 2 && !Device.android)) {
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return;
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}
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zoom.fakeGestureTouched = false;
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zoom.fakeGestureMoved = false;
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}
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if (!gesture.$imageEl || gesture.$imageEl.length === 0) return;
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zoom.scale = Math.max(Math.min(zoom.scale, gesture.maxRatio), params.minRatio);
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gesture.$imageEl.transition(swiper.params.speed).transform(`translate3d(0,0,0) scale(${zoom.scale})`);
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zoom.currentScale = zoom.scale;
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zoom.isScaling = false;
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if (zoom.scale === 1) gesture.$slideEl = undefined;
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},
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onTouchStart(e) {
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const swiper = this;
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const zoom = swiper.zoom;
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const { gesture, image } = zoom;
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if (!gesture.$imageEl || gesture.$imageEl.length === 0) return;
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if (image.isTouched) return;
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if (Device.android && e.cancelable) e.preventDefault();
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image.isTouched = true;
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image.touchesStart.x = e.type === 'touchstart' ? e.targetTouches[0].pageX : e.pageX;
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image.touchesStart.y = e.type === 'touchstart' ? e.targetTouches[0].pageY : e.pageY;
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},
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onTouchMove(e) {
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const swiper = this;
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const zoom = swiper.zoom;
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const { gesture, image, velocity } = zoom;
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if (!gesture.$imageEl || gesture.$imageEl.length === 0) return;
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swiper.allowClick = false;
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if (!image.isTouched || !gesture.$slideEl) return;
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if (!image.isMoved) {
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image.width = gesture.$imageEl[0].offsetWidth;
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image.height = gesture.$imageEl[0].offsetHeight;
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image.startX = Utils.getTranslate(gesture.$imageWrapEl[0], 'x') || 0;
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image.startY = Utils.getTranslate(gesture.$imageWrapEl[0], 'y') || 0;
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gesture.slideWidth = gesture.$slideEl[0].offsetWidth;
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gesture.slideHeight = gesture.$slideEl[0].offsetHeight;
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gesture.$imageWrapEl.transition(0);
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if (swiper.rtl) {
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image.startX = -image.startX;
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image.startY = -image.startY;
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}
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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 = e.type === 'touchmove' ? e.targetTouches[0].pageX : e.pageX;
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image.touchesCurrent.y = e.type === 'touchmove' ? e.targetTouches[0].pageY : e.pageY;
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if (!image.isMoved && !zoom.isScaling) {
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if (
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swiper.isHorizontal()
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&& (
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(Math.floor(image.minX) === Math.floor(image.startX) && image.touchesCurrent.x < image.touchesStart.x)
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|| (Math.floor(image.maxX) === Math.floor(image.startX) && image.touchesCurrent.x > image.touchesStart.x)
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)
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) {
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image.isTouched = false;
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return;
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} if (
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!swiper.isHorizontal()
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&& (
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(Math.floor(image.minY) === Math.floor(image.startY) && image.touchesCurrent.y < image.touchesStart.y)
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|| (Math.floor(image.maxY) === Math.floor(image.startY) && image.touchesCurrent.y > image.touchesStart.y)
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)
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) {
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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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image.currentX = (image.touchesCurrent.x - image.touchesStart.x) + image.startX;
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image.currentY = (image.touchesCurrent.y - image.touchesStart.y) + image.startY;
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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.transform(`translate3d(${image.currentX}px, ${image.currentY}px,0)`);
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},
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onTouchEnd() {
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const swiper = this;
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const zoom = swiper.zoom;
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const { gesture, image, velocity } = zoom;
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if (!gesture.$imageEl || gesture.$imageEl.length === 0) 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.transition(momentumDuration).transform(`translate3d(${image.currentX}px, ${image.currentY}px,0)`);
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},
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onTransitionEnd() {
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const swiper = this;
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const zoom = swiper.zoom;
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const { gesture } = zoom;
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if (gesture.$slideEl && swiper.previousIndex !== swiper.activeIndex) {
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if (gesture.$imageEl) {
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gesture.$imageEl.transform('translate3d(0,0,0) scale(1)');
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}
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if (gesture.$imageWrapEl) {
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gesture.$imageWrapEl.transform('translate3d(0,0,0)');
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}
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zoom.scale = 1;
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zoom.currentScale = 1;
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gesture.$slideEl = undefined;
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gesture.$imageEl = undefined;
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gesture.$imageWrapEl = undefined;
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}
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},
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// Toggle Zoom
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toggle(e) {
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const swiper = this;
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const zoom = swiper.zoom;
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if (zoom.scale && zoom.scale !== 1) {
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// Zoom Out
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zoom.out();
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} else {
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// Zoom In
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zoom.in(e);
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}
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},
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in(e) {
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const swiper = this;
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const zoom = swiper.zoom;
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const params = swiper.params.zoom;
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const { gesture, image } = zoom;
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if (!gesture.$slideEl) {
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if (swiper.params.virtual && swiper.params.virtual.enabled && swiper.virtual) {
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gesture.$slideEl = swiper.$wrapperEl.children(`.${swiper.params.slideActiveClass}`);
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} else {
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gesture.$slideEl = swiper.slides.eq(swiper.activeIndex);
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}
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gesture.$imageEl = gesture.$slideEl.find('img, svg, canvas, picture, .swiper-zoom-target');
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gesture.$imageWrapEl = gesture.$imageEl.parent(`.${params.containerClass}`);
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}
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if (!gesture.$imageEl || gesture.$imageEl.length === 0) return;
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gesture.$slideEl.addClass(`${params.zoomedSlideClass}`);
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let touchX;
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let touchY;
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let offsetX;
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let offsetY;
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let diffX;
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let diffY;
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let translateX;
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let translateY;
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let imageWidth;
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let imageHeight;
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let scaledWidth;
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let scaledHeight;
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let translateMinX;
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let translateMinY;
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let translateMaxX;
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let translateMaxY;
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let slideWidth;
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let slideHeight;
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if (typeof image.touchesStart.x === 'undefined' && e) {
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touchX = e.type === 'touchend' ? e.changedTouches[0].pageX : e.pageX;
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touchY = e.type === 'touchend' ? e.changedTouches[0].pageY : e.pageY;
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} else {
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touchX = image.touchesStart.x;
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touchY = image.touchesStart.y;
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}
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zoom.scale = gesture.$imageWrapEl.attr('data-swiper-zoom') || params.maxRatio;
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zoom.currentScale = gesture.$imageWrapEl.attr('data-swiper-zoom') || params.maxRatio;
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if (e) {
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slideWidth = gesture.$slideEl[0].offsetWidth;
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slideHeight = gesture.$slideEl[0].offsetHeight;
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offsetX = gesture.$slideEl.offset().left;
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offsetY = gesture.$slideEl.offset().top;
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diffX = (offsetX + (slideWidth / 2)) - touchX;
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diffY = (offsetY + (slideHeight / 2)) - touchY;
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imageWidth = gesture.$imageEl[0].offsetWidth;
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imageHeight = gesture.$imageEl[0].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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}
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gesture.$imageWrapEl.transition(300).transform(`translate3d(${translateX}px, ${translateY}px,0)`);
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gesture.$imageEl.transition(300).transform(`translate3d(0,0,0) scale(${zoom.scale})`);
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},
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out() {
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const swiper = this;
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const zoom = swiper.zoom;
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const params = swiper.params.zoom;
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const { gesture } = zoom;
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if (!gesture.$slideEl) {
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if (swiper.params.virtual && swiper.params.virtual.enabled && swiper.virtual) {
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gesture.$slideEl = swiper.$wrapperEl.children(`.${swiper.params.slideActiveClass}`);
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} else {
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gesture.$slideEl = swiper.slides.eq(swiper.activeIndex);
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}
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gesture.$imageEl = gesture.$slideEl.find('img, svg, canvas, picture, .swiper-zoom-target');
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gesture.$imageWrapEl = gesture.$imageEl.parent(`.${params.containerClass}`);
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}
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if (!gesture.$imageEl || gesture.$imageEl.length === 0) return;
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zoom.scale = 1;
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zoom.currentScale = 1;
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gesture.$imageWrapEl.transition(300).transform('translate3d(0,0,0)');
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gesture.$imageEl.transition(300).transform('translate3d(0,0,0) scale(1)');
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gesture.$slideEl.removeClass(`${params.zoomedSlideClass}`);
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gesture.$slideEl = undefined;
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},
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// Attach/Detach Events
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enable() {
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const swiper = this;
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const zoom = swiper.zoom;
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if (zoom.enabled) return;
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zoom.enabled = true;
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const passiveListener = swiper.touchEvents.start === 'touchstart' && Support.passiveListener && swiper.params.passiveListeners ? { passive: true, capture: false } : false;
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const activeListenerWithCapture = Support.passiveListener ? { passive: false, capture: true } : true;
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const slideSelector = `.${swiper.params.slideClass}`;
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// Scale image
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if (Support.gestures) {
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swiper.$wrapperEl.on('gesturestart', slideSelector, zoom.onGestureStart, passiveListener);
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swiper.$wrapperEl.on('gesturechange', slideSelector, zoom.onGestureChange, passiveListener);
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swiper.$wrapperEl.on('gestureend', slideSelector, zoom.onGestureEnd, passiveListener);
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} else if (swiper.touchEvents.start === 'touchstart') {
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swiper.$wrapperEl.on(swiper.touchEvents.start, slideSelector, zoom.onGestureStart, passiveListener);
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swiper.$wrapperEl.on(swiper.touchEvents.move, slideSelector, zoom.onGestureChange, activeListenerWithCapture);
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swiper.$wrapperEl.on(swiper.touchEvents.end, slideSelector, zoom.onGestureEnd, passiveListener);
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if (swiper.touchEvents.cancel) {
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swiper.$wrapperEl.on(swiper.touchEvents.cancel, slideSelector, zoom.onGestureEnd, passiveListener);
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}
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}
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// Move image
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swiper.$wrapperEl.on(swiper.touchEvents.move, `.${swiper.params.zoom.containerClass}`, zoom.onTouchMove, activeListenerWithCapture);
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},
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disable() {
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const swiper = this;
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const zoom = swiper.zoom;
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if (!zoom.enabled) return;
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swiper.zoom.enabled = false;
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const passiveListener = swiper.touchEvents.start === 'touchstart' && Support.passiveListener && swiper.params.passiveListeners ? { passive: true, capture: false } : false;
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const activeListenerWithCapture = Support.passiveListener ? { passive: false, capture: true } : true;
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const slideSelector = `.${swiper.params.slideClass}`;
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|
// Scale image
|
if (Support.gestures) {
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swiper.$wrapperEl.off('gesturestart', slideSelector, zoom.onGestureStart, passiveListener);
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swiper.$wrapperEl.off('gesturechange', slideSelector, zoom.onGestureChange, passiveListener);
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swiper.$wrapperEl.off('gestureend', slideSelector, zoom.onGestureEnd, passiveListener);
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} else if (swiper.touchEvents.start === 'touchstart') {
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swiper.$wrapperEl.off(swiper.touchEvents.start, slideSelector, zoom.onGestureStart, passiveListener);
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swiper.$wrapperEl.off(swiper.touchEvents.move, slideSelector, zoom.onGestureChange, activeListenerWithCapture);
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swiper.$wrapperEl.off(swiper.touchEvents.end, slideSelector, zoom.onGestureEnd, passiveListener);
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if (swiper.touchEvents.cancel) {
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swiper.$wrapperEl.off(swiper.touchEvents.cancel, slideSelector, zoom.onGestureEnd, passiveListener);
|
}
|
}
|
|
// Move image
|
swiper.$wrapperEl.off(swiper.touchEvents.move, `.${swiper.params.zoom.containerClass}`, zoom.onTouchMove, activeListenerWithCapture);
|
},
|
};
|
|
export default {
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name: 'zoom',
|
params: {
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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',
|
},
|
},
|
create() {
|
const swiper = this;
|
const zoom = {
|
enabled: false,
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scale: 1,
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currentScale: 1,
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isScaling: false,
|
gesture: {
|
$slideEl: undefined,
|
slideWidth: undefined,
|
slideHeight: undefined,
|
$imageEl: undefined,
|
$imageWrapEl: undefined,
|
maxRatio: 3,
|
},
|
image: {
|
isTouched: undefined,
|
isMoved: undefined,
|
currentX: undefined,
|
currentY: undefined,
|
minX: undefined,
|
minY: undefined,
|
maxX: undefined,
|
maxY: undefined,
|
width: undefined,
|
height: undefined,
|
startX: undefined,
|
startY: undefined,
|
touchesStart: {},
|
touchesCurrent: {},
|
},
|
velocity: {
|
x: undefined,
|
y: undefined,
|
prevPositionX: undefined,
|
prevPositionY: undefined,
|
prevTime: undefined,
|
},
|
};
|
|
('onGestureStart onGestureChange onGestureEnd onTouchStart onTouchMove onTouchEnd onTransitionEnd toggle enable disable in out').split(' ').forEach((methodName) => {
|
zoom[methodName] = Zoom[methodName].bind(swiper);
|
});
|
Utils.extend(swiper, {
|
zoom,
|
});
|
|
let scale = 1;
|
Object.defineProperty(swiper.zoom, 'scale', {
|
get() {
|
return scale;
|
},
|
set(value) {
|
if (scale !== value) {
|
const imageEl = swiper.zoom.gesture.$imageEl ? swiper.zoom.gesture.$imageEl[0] : undefined;
|
const slideEl = swiper.zoom.gesture.$slideEl ? swiper.zoom.gesture.$slideEl[0] : undefined;
|
swiper.emit('zoomChange', value, imageEl, slideEl);
|
}
|
scale = value;
|
},
|
});
|
},
|
on: {
|
init() {
|
const swiper = this;
|
if (swiper.params.zoom.enabled) {
|
swiper.zoom.enable();
|
}
|
},
|
destroy() {
|
const swiper = this;
|
swiper.zoom.disable();
|
},
|
touchStart(e) {
|
const swiper = this;
|
if (!swiper.zoom.enabled) return;
|
swiper.zoom.onTouchStart(e);
|
},
|
touchEnd(e) {
|
const swiper = this;
|
if (!swiper.zoom.enabled) return;
|
swiper.zoom.onTouchEnd(e);
|
},
|
doubleTap(e) {
|
const swiper = this;
|
if (swiper.params.zoom.enabled && swiper.zoom.enabled && swiper.params.zoom.toggle) {
|
swiper.zoom.toggle(e);
|
}
|
},
|
transitionEnd() {
|
const swiper = this;
|
if (swiper.zoom.enabled && swiper.params.zoom.enabled) {
|
swiper.zoom.onTransitionEnd();
|
}
|
},
|
slideChange() {
|
const swiper = this;
|
if (swiper.zoom.enabled && swiper.params.zoom.enabled && swiper.params.cssMode) {
|
swiper.zoom.onTransitionEnd();
|
}
|
},
|
},
|
};
|
