swiper/cjs/components/zoom/zoom.js

Most modern mobile touch slider and framework with hardware accelerated transitions

"use strict";

exports.__esModule = true;
exports.default = void 0;

var _dom = _interopRequireDefault(require("../../utils/dom"));

var _utils = require("../../utils/utils");

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function _extends() { _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); }

var Zoom = {
  // Calc Scale From Multi-touches
  getDistanceBetweenTouches: function getDistanceBetweenTouches(e) {
    if (e.targetTouches.length < 2) return 1;
    var x1 = e.targetTouches[0].pageX;
    var y1 = e.targetTouches[0].pageY;
    var x2 = e.targetTouches[1].pageX;
    var y2 = e.targetTouches[1].pageY;
    var distance = Math.sqrt(Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2));
    return distance;
  },
  // Events
  onGestureStart: function onGestureStart(e) {
    var swiper = this;
    var support = swiper.support;
    var params = swiper.params.zoom;
    var zoom = swiper.zoom;
    var gesture = zoom.gesture;
    zoom.fakeGestureTouched = false;
    zoom.fakeGestureMoved = false;

    if (!support.gestures) {
      if (e.type !== 'touchstart' || e.type === 'touchstart' && e.targetTouches.length < 2) {
        return;
      }

      zoom.fakeGestureTouched = true;
      gesture.scaleStart = Zoom.getDistanceBetweenTouches(e);
    }

    if (!gesture.$slideEl || !gesture.$slideEl.length) {
      gesture.$slideEl = (0, _dom.default)(e.target).closest("." + swiper.params.slideClass);
      if (gesture.$slideEl.length === 0) gesture.$slideEl = swiper.slides.eq(swiper.activeIndex);
      gesture.$imageEl = gesture.$slideEl.find('img, svg, canvas, picture, .swiper-zoom-target');
      gesture.$imageWrapEl = gesture.$imageEl.parent("." + params.containerClass);
      gesture.maxRatio = gesture.$imageWrapEl.attr('data-swiper-zoom') || params.maxRatio;

      if (gesture.$imageWrapEl.length === 0) {
        gesture.$imageEl = undefined;
        return;
      }
    }

    if (gesture.$imageEl) {
      gesture.$imageEl.transition(0);
    }

    swiper.zoom.isScaling = true;
  },
  onGestureChange: function onGestureChange(e) {
    var swiper = this;
    var support = swiper.support;
    var params = swiper.params.zoom;
    var zoom = swiper.zoom;
    var gesture = zoom.gesture;

    if (!support.gestures) {
      if (e.type !== 'touchmove' || e.type === 'touchmove' && e.targetTouches.length < 2) {
        return;
      }

      zoom.fakeGestureMoved = true;
      gesture.scaleMove = Zoom.getDistanceBetweenTouches(e);
    }

    if (!gesture.$imageEl || gesture.$imageEl.length === 0) {
      if (e.type === 'gesturechange') zoom.onGestureStart(e);
      return;
    }

    if (support.gestures) {
      zoom.scale = e.scale * zoom.currentScale;
    } else {
      zoom.scale = gesture.scaleMove / gesture.scaleStart * zoom.currentScale;
    }

    if (zoom.scale > gesture.maxRatio) {
      zoom.scale = gesture.maxRatio - 1 + Math.pow(zoom.scale - gesture.maxRatio + 1, 0.5);
    }

    if (zoom.scale < params.minRatio) {
      zoom.scale = params.minRatio + 1 - Math.pow(params.minRatio - zoom.scale + 1, 0.5);
    }

    gesture.$imageEl.transform("translate3d(0,0,0) scale(" + zoom.scale + ")");
  },
  onGestureEnd: function onGestureEnd(e) {
    var swiper = this;
    var device = swiper.device;
    var support = swiper.support;
    var params = swiper.params.zoom;
    var zoom = swiper.zoom;
    var gesture = zoom.gesture;

    if (!support.gestures) {
      if (!zoom.fakeGestureTouched || !zoom.fakeGestureMoved) {
        return;
      }

      if (e.type !== 'touchend' || e.type === 'touchend' && e.changedTouches.length < 2 && !device.android) {
        return;
      }

      zoom.fakeGestureTouched = false;
      zoom.fakeGestureMoved = false;
    }

    if (!gesture.$imageEl || gesture.$imageEl.length === 0) return;
    zoom.scale = Math.max(Math.min(zoom.scale, gesture.maxRatio), params.minRatio);
    gesture.$imageEl.transition(swiper.params.speed).transform("translate3d(0,0,0) scale(" + zoom.scale + ")");
    zoom.currentScale = zoom.scale;
    zoom.isScaling = false;
    if (zoom.scale === 1) gesture.$slideEl = undefined;
  },
  onTouchStart: function onTouchStart(e) {
    var swiper = this;
    var device = swiper.device;
    var zoom = swiper.zoom;
    var gesture = zoom.gesture,
        image = zoom.image;
    if (!gesture.$imageEl || gesture.$imageEl.length === 0) return;
    if (image.isTouched) return;
    if (device.android && e.cancelable) e.preventDefault();
    image.isTouched = true;
    image.touchesStart.x = e.type === 'touchstart' ? e.targetTouches[0].pageX : e.pageX;
    image.touchesStart.y = e.type === 'touchstart' ? e.targetTouches[0].pageY : e.pageY;
  },
  onTouchMove: function onTouchMove(e) {
    var swiper = this;
    var zoom = swiper.zoom;
    var gesture = zoom.gesture,
        image = zoom.image,
        velocity = zoom.velocity;
    if (!gesture.$imageEl || gesture.$imageEl.length === 0) return;
    swiper.allowClick = false;
    if (!image.isTouched || !gesture.$slideEl) return;

    if (!image.isMoved) {
      image.width = gesture.$imageEl[0].offsetWidth;
      image.height = gesture.$imageEl[0].offsetHeight;
      image.startX = (0, _utils.getTranslate)(gesture.$imageWrapEl[0], 'x') || 0;
      image.startY = (0, _utils.getTranslate)(gesture.$imageWrapEl[0], 'y') || 0;
      gesture.slideWidth = gesture.$slideEl[0].offsetWidth;
      gesture.slideHeight = gesture.$slideEl[0].offsetHeight;
      gesture.$imageWrapEl.transition(0);

      if (swiper.rtl) {
        image.startX = -image.startX;
        image.startY = -image.startY;
      }
    } // Define if we need image drag


    var scaledWidth = image.width * zoom.scale;
    var scaledHeight = image.height * zoom.scale;
    if (scaledWidth < gesture.slideWidth && scaledHeight < gesture.slideHeight) return;
    image.minX = Math.min(gesture.slideWidth / 2 - scaledWidth / 2, 0);
    image.maxX = -image.minX;
    image.minY = Math.min(gesture.slideHeight / 2 - scaledHeight / 2, 0);
    image.maxY = -image.minY;
    image.touchesCurrent.x = e.type === 'touchmove' ? e.targetTouches[0].pageX : e.pageX;
    image.touchesCurrent.y = e.type === 'touchmove' ? e.targetTouches[0].pageY : e.pageY;

    if (!image.isMoved && !zoom.isScaling) {
      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)) {
        image.isTouched = false;
        return;
      }

      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)) {
        image.isTouched = false;
        return;
      }
    }

    if (e.cancelable) {
      e.preventDefault();
    }

    e.stopPropagation();
    image.isMoved = true;
    image.currentX = image.touchesCurrent.x - image.touchesStart.x + image.startX;
    image.currentY = image.touchesCurrent.y - image.touchesStart.y + image.startY;

    if (image.currentX < image.minX) {
      image.currentX = image.minX + 1 - Math.pow(image.minX - image.currentX + 1, 0.8);
    }

    if (image.currentX > image.maxX) {
      image.currentX = image.maxX - 1 + Math.pow(image.currentX - image.maxX + 1, 0.8);
    }

    if (image.currentY < image.minY) {
      image.currentY = image.minY + 1 - Math.pow(image.minY - image.currentY + 1, 0.8);
    }

    if (image.currentY > image.maxY) {
      image.currentY = image.maxY - 1 + Math.pow(image.currentY - image.maxY + 1, 0.8);
    } // Velocity


    if (!velocity.prevPositionX) velocity.prevPositionX = image.touchesCurrent.x;
    if (!velocity.prevPositionY) velocity.prevPositionY = image.touchesCurrent.y;
    if (!velocity.prevTime) velocity.prevTime = Date.now();
    velocity.x = (image.touchesCurrent.x - velocity.prevPositionX) / (Date.now() - velocity.prevTime) / 2;
    velocity.y = (image.touchesCurrent.y - velocity.prevPositionY) / (Date.now() - velocity.prevTime) / 2;
    if (Math.abs(image.touchesCurrent.x - velocity.prevPositionX) < 2) velocity.x = 0;
    if (Math.abs(image.touchesCurrent.y - velocity.prevPositionY) < 2) velocity.y = 0;
    velocity.prevPositionX = image.touchesCurrent.x;
    velocity.prevPositionY = image.touchesCurrent.y;
    velocity.prevTime = Date.now();
    gesture.$imageWrapEl.transform("translate3d(" + image.currentX + "px, " + image.currentY + "px,0)");
  },
  onTouchEnd: function onTouchEnd() {
    var swiper = this;
    var zoom = swiper.zoom;
    var gesture = zoom.gesture,
        image = zoom.image,
        velocity = zoom.velocity;
    if (!gesture.$imageEl || gesture.$imageEl.length === 0) return;

    if (!image.isTouched || !image.isMoved) {
      image.isTouched = false;
      image.isMoved = false;
      return;
    }

    image.isTouched = false;
    image.isMoved = false;
    var momentumDurationX = 300;
    var momentumDurationY = 300;
    var momentumDistanceX = velocity.x * momentumDurationX;
    var newPositionX = image.currentX + momentumDistanceX;
    var momentumDistanceY = velocity.y * momentumDurationY;
    var newPositionY = image.currentY + momentumDistanceY; // Fix duration

    if (velocity.x !== 0) momentumDurationX = Math.abs((newPositionX - image.currentX) / velocity.x);
    if (velocity.y !== 0) momentumDurationY = Math.abs((newPositionY - image.currentY) / velocity.y);
    var momentumDuration = Math.max(momentumDurationX, momentumDurationY);
    image.currentX = newPositionX;
    image.currentY = newPositionY; // Define if we need image drag

    var scaledWidth = image.width * zoom.scale;
    var scaledHeight = image.height * zoom.scale;
    image.minX = Math.min(gesture.slideWidth / 2 - scaledWidth / 2, 0);
    image.maxX = -image.minX;
    image.minY = Math.min(gesture.slideHeight / 2 - scaledHeight / 2, 0);
    image.maxY = -image.minY;
    image.currentX = Math.max(Math.min(image.currentX, image.maxX), image.minX);
    image.currentY = Math.max(Math.min(image.currentY, image.maxY), image.minY);
    gesture.$imageWrapEl.transition(momentumDuration).transform("translate3d(" + image.currentX + "px, " + image.currentY + "px,0)");
  },
  onTransitionEnd: function onTransitionEnd() {
    var swiper = this;
    var zoom = swiper.zoom;
    var gesture = zoom.gesture;

    if (gesture.$slideEl && swiper.previousIndex !== swiper.activeIndex) {
      if (gesture.$imageEl) {
        gesture.$imageEl.transform('translate3d(0,0,0) scale(1)');
      }

      if (gesture.$imageWrapEl) {
        gesture.$imageWrapEl.transform('translate3d(0,0,0)');
      }

      zoom.scale = 1;
      zoom.currentScale = 1;
      gesture.$slideEl = undefined;
      gesture.$imageEl = undefined;
      gesture.$imageWrapEl = undefined;
    }
  },
  // Toggle Zoom
  toggle: function toggle(e) {
    var swiper = this;
    var zoom = swiper.zoom;

    if (zoom.scale && zoom.scale !== 1) {
      // Zoom Out
      zoom.out();
    } else {
      // Zoom In
      zoom.in(e);
    }
  },
  in: function _in(e) {
    var swiper = this;
    var zoom = swiper.zoom;
    var params = swiper.params.zoom;
    var gesture = zoom.gesture,
        image = zoom.image;

    if (!gesture.$slideEl) {
      if (swiper.params.virtual && swiper.params.virtual.enabled && swiper.virtual) {
        gesture.$slideEl = swiper.$wrapperEl.children("." + swiper.params.slideActiveClass);
      } else {
        gesture.$slideEl = swiper.slides.eq(swiper.activeIndex);
      }

      gesture.$imageEl = gesture.$slideEl.find('img, svg, canvas, picture, .swiper-zoom-target');
      gesture.$imageWrapEl = gesture.$imageEl.parent("." + params.containerClass);
    }

    if (!gesture.$imageEl || gesture.$imageEl.length === 0) return;
    gesture.$slideEl.addClass("" + params.zoomedSlideClass);
    var touchX;
    var touchY;
    var offsetX;
    var offsetY;
    var diffX;
    var diffY;
    var translateX;
    var translateY;
    var imageWidth;
    var imageHeight;
    var scaledWidth;
    var scaledHeight;
    var translateMinX;
    var translateMinY;
    var translateMaxX;
    var translateMaxY;
    var slideWidth;
    var slideHeight;

    if (typeof image.touchesStart.x === 'undefined' && e) {
      touchX = e.type === 'touchend' ? e.changedTouches[0].pageX : e.pageX;
      touchY = e.type === 'touchend' ? e.changedTouches[0].pageY : e.pageY;
    } else {
      touchX = image.touchesStart.x;
      touchY = image.touchesStart.y;
    }

    zoom.scale = gesture.$imageWrapEl.attr('data-swiper-zoom') || params.maxRatio;
    zoom.currentScale = gesture.$imageWrapEl.attr('data-swiper-zoom') || params.maxRatio;

    if (e) {
      slideWidth = gesture.$slideEl[0].offsetWidth;
      slideHeight = gesture.$slideEl[0].offsetHeight;
      offsetX = gesture.$slideEl.offset().left;
      offsetY = gesture.$slideEl.offset().top;
      diffX = offsetX + slideWidth / 2 - touchX;
      diffY = offsetY + slideHeight / 2 - touchY;
      imageWidth = gesture.$imageEl[0].offsetWidth;
      imageHeight = gesture.$imageEl[0].offsetHeight;
      scaledWidth = imageWidth * zoom.scale;
      scaledHeight = imageHeight * zoom.scale;
      translateMinX = Math.min(slideWidth / 2 - scaledWidth / 2, 0);
      translateMinY = Math.min(slideHeight / 2 - scaledHeight / 2, 0);
      translateMaxX = -translateMinX;
      translateMaxY = -translateMinY;
      translateX = diffX * zoom.scale;
      translateY = diffY * zoom.scale;

      if (translateX < translateMinX) {
        translateX = translateMinX;
      }

      if (translateX > translateMaxX) {
        translateX = translateMaxX;
      }

      if (translateY < translateMinY) {
        translateY = translateMinY;
      }

      if (translateY > translateMaxY) {
        translateY = translateMaxY;
      }
    } else {
      translateX = 0;
      translateY = 0;
    }

    gesture.$imageWrapEl.transition(300).transform("translate3d(" + translateX + "px, " + translateY + "px,0)");
    gesture.$imageEl.transition(300).transform("translate3d(0,0,0) scale(" + zoom.scale + ")");
  },
  out: function out() {
    var swiper = this;
    var zoom = swiper.zoom;
    var params = swiper.params.zoom;
    var gesture = zoom.gesture;

    if (!gesture.$slideEl) {
      if (swiper.params.virtual && swiper.params.virtual.enabled && swiper.virtual) {
        gesture.$slideEl = swiper.$wrapperEl.children("." + swiper.params.slideActiveClass);
      } else {
        gesture.$slideEl = swiper.slides.eq(swiper.activeIndex);
      }

      gesture.$imageEl = gesture.$slideEl.find('img, svg, canvas, picture, .swiper-zoom-target');
      gesture.$imageWrapEl = gesture.$imageEl.parent("." + params.containerClass);
    }

    if (!gesture.$imageEl || gesture.$imageEl.length === 0) return;
    zoom.scale = 1;
    zoom.currentScale = 1;
    gesture.$imageWrapEl.transition(300).transform('translate3d(0,0,0)');
    gesture.$imageEl.transition(300).transform('translate3d(0,0,0) scale(1)');
    gesture.$slideEl.removeClass("" + params.zoomedSlideClass);
    gesture.$slideEl = undefined;
  },
  toggleGestures: function toggleGestures(method) {
    var swiper = this;
    var zoom = swiper.zoom;
    var selector = zoom.slideSelector,
        passive = zoom.passiveListener;
    swiper.$wrapperEl[method]('gesturestart', selector, zoom.onGestureStart, passive);
    swiper.$wrapperEl[method]('gesturechange', selector, zoom.onGestureChange, passive);
    swiper.$wrapperEl[method]('gestureend', selector, zoom.onGestureEnd, passive);
  },
  enableGestures: function enableGestures() {
    if (this.zoom.gesturesEnabled) return;
    this.zoom.gesturesEnabled = true;
    this.zoom.toggleGestures('on');
  },
  disableGestures: function disableGestures() {
    if (!this.zoom.gesturesEnabled) return;
    this.zoom.gesturesEnabled = false;
    this.zoom.toggleGestures('off');
  },
  // Attach/Detach Events
  enable: function enable() {
    var swiper = this;
    var support = swiper.support;
    var zoom = swiper.zoom;
    if (zoom.enabled) return;
    zoom.enabled = true;
    var passiveListener = swiper.touchEvents.start === 'touchstart' && support.passiveListener && swiper.params.passiveListeners ? {
      passive: true,
      capture: false
    } : false;
    var activeListenerWithCapture = support.passiveListener ? {
      passive: false,
      capture: true
    } : true;
    var slideSelector = "." + swiper.params.slideClass;
    swiper.zoom.passiveListener = passiveListener;
    swiper.zoom.slideSelector = slideSelector; // Scale image

    if (support.gestures) {
      swiper.$wrapperEl.on(swiper.touchEvents.start, swiper.zoom.enableGestures, passiveListener);
      swiper.$wrapperEl.on(swiper.touchEvents.end, swiper.zoom.disableGestures, passiveListener);
    } else if (swiper.touchEvents.start === 'touchstart') {
      swiper.$wrapperEl.on(swiper.touchEvents.start, slideSelector, zoom.onGestureStart, passiveListener);
      swiper.$wrapperEl.on(swiper.touchEvents.move, slideSelector, zoom.onGestureChange, activeListenerWithCapture);
      swiper.$wrapperEl.on(swiper.touchEvents.end, slideSelector, zoom.onGestureEnd, passiveListener);

      if (swiper.touchEvents.cancel) {
        swiper.$wrapperEl.on(swiper.touchEvents.cancel, slideSelector, zoom.onGestureEnd, passiveListener);
      }
    } // Move image


    swiper.$wrapperEl.on(swiper.touchEvents.move, "." + swiper.params.zoom.containerClass, zoom.onTouchMove, activeListenerWithCapture);
  },
  disable: function disable() {
    var swiper = this;
    var zoom = swiper.zoom;
    if (!zoom.enabled) return;
    var support = swiper.support;
    swiper.zoom.enabled = false;
    var passiveListener = swiper.touchEvents.start === 'touchstart' && support.passiveListener && swiper.params.passiveListeners ? {
      passive: true,
      capture: false
    } : false;
    var activeListenerWithCapture = support.passiveListener ? {
      passive: false,
      capture: true
    } : true;
    var slideSelector = "." + swiper.params.slideClass; // Scale image

    if (support.gestures) {
      swiper.$wrapperEl.off(swiper.touchEvents.start, swiper.zoom.enableGestures, passiveListener);
      swiper.$wrapperEl.off(swiper.touchEvents.end, swiper.zoom.disableGestures, passiveListener);
    } else if (swiper.touchEvents.start === 'touchstart') {
      swiper.$wrapperEl.off(swiper.touchEvents.start, slideSelector, zoom.onGestureStart, passiveListener);
      swiper.$wrapperEl.off(swiper.touchEvents.move, slideSelector, zoom.onGestureChange, activeListenerWithCapture);
      swiper.$wrapperEl.off(swiper.touchEvents.end, slideSelector, zoom.onGestureEnd, passiveListener);

      if (swiper.touchEvents.cancel) {
        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);
  }
};
var _default = {
  name: 'zoom',
  params: {
    zoom: {
      enabled: false,
      maxRatio: 3,
      minRatio: 1,
      toggle: true,
      containerClass: 'swiper-zoom-container',
      zoomedSlideClass: 'swiper-slide-zoomed'
    }
  },
  create: function create() {
    var swiper = this;
    (0, _utils.bindModuleMethods)(swiper, {
      zoom: _extends({
        enabled: false,
        scale: 1,
        currentScale: 1,
        isScaling: false,
        gesture: {
          $slideEl: undefined,
          slideWidth: undefined,
          slideHeight: undefined,
          $imageEl: undefined,
          $imageWrapEl: undefined,
          maxRatio: 3
        },
        image: {
          isTouched: undefined,
          isMoved: undefined,
          currentX: undefined,
          currentY: undefined,
          minX: undefined,
          minY: undefined,
          maxX: undefined,
          maxY: undefined,
          width: undefined,
          height: undefined,
          startX: undefined,
          startY: undefined,
          touchesStart: {},
          touchesCurrent: {}
        },
        velocity: {
          x: undefined,
          y: undefined,
          prevPositionX: undefined,
          prevPositionY: undefined,
          prevTime: undefined
        }
      }, Zoom)
    });
    var scale = 1;
    Object.defineProperty(swiper.zoom, 'scale', {
      get: function get() {
        return scale;
      },
      set: function set(value) {
        if (scale !== value) {
          var imageEl = swiper.zoom.gesture.$imageEl ? swiper.zoom.gesture.$imageEl[0] : undefined;
          var slideEl = swiper.zoom.gesture.$slideEl ? swiper.zoom.gesture.$slideEl[0] : undefined;
          swiper.emit('zoomChange', value, imageEl, slideEl);
        }

        scale = value;
      }
    });
  },
  on: {
    init: function init(swiper) {
      if (swiper.params.zoom.enabled) {
        swiper.zoom.enable();
      }
    },
    destroy: function destroy(swiper) {
      swiper.zoom.disable();
    },
    touchStart: function touchStart(swiper, e) {
      if (!swiper.zoom.enabled) return;
      swiper.zoom.onTouchStart(e);
    },
    touchEnd: function touchEnd(swiper, e) {
      if (!swiper.zoom.enabled) return;
      swiper.zoom.onTouchEnd(e);
    },
    doubleTap: function doubleTap(swiper, e) {
      if (swiper.params.zoom.enabled && swiper.zoom.enabled && swiper.params.zoom.toggle) {
        swiper.zoom.toggle(e);
      }
    },
    transitionEnd: function transitionEnd(swiper) {
      if (swiper.zoom.enabled && swiper.params.zoom.enabled) {
        swiper.zoom.onTransitionEnd();
      }
    },
    slideChange: function slideChange(swiper) {
      if (swiper.zoom.enabled && swiper.params.zoom.enabled && swiper.params.cssMode) {
        swiper.zoom.onTransitionEnd();
      }
    }
  }
};
exports.default = _default;