swiper/esm/components/scrollbar/scrollbar.js

Most modern mobile touch slider and framework with hardware accelerated transitions

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); }

import { getDocument } from 'ssr-window';
import $ from '../../utils/dom';
import { extend, nextTick, bindModuleMethods } from '../../utils/utils';
var Scrollbar = {
  setTranslate: function setTranslate() {
    var swiper = this;
    if (!swiper.params.scrollbar.el || !swiper.scrollbar.el) return;
    var scrollbar = swiper.scrollbar,
        rtl = swiper.rtlTranslate,
        progress = swiper.progress;
    var dragSize = scrollbar.dragSize,
        trackSize = scrollbar.trackSize,
        $dragEl = scrollbar.$dragEl,
        $el = scrollbar.$el;
    var params = swiper.params.scrollbar;
    var newSize = dragSize;
    var newPos = (trackSize - dragSize) * progress;

    if (rtl) {
      newPos = -newPos;

      if (newPos > 0) {
        newSize = dragSize - newPos;
        newPos = 0;
      } else if (-newPos + dragSize > trackSize) {
        newSize = trackSize + newPos;
      }
    } else if (newPos < 0) {
      newSize = dragSize + newPos;
      newPos = 0;
    } else if (newPos + dragSize > trackSize) {
      newSize = trackSize - newPos;
    }

    if (swiper.isHorizontal()) {
      $dragEl.transform("translate3d(" + newPos + "px, 0, 0)");
      $dragEl[0].style.width = newSize + "px";
    } else {
      $dragEl.transform("translate3d(0px, " + newPos + "px, 0)");
      $dragEl[0].style.height = newSize + "px";
    }

    if (params.hide) {
      clearTimeout(swiper.scrollbar.timeout);
      $el[0].style.opacity = 1;
      swiper.scrollbar.timeout = setTimeout(function () {
        $el[0].style.opacity = 0;
        $el.transition(400);
      }, 1000);
    }
  },
  setTransition: function setTransition(duration) {
    var swiper = this;
    if (!swiper.params.scrollbar.el || !swiper.scrollbar.el) return;
    swiper.scrollbar.$dragEl.transition(duration);
  },
  updateSize: function updateSize() {
    var swiper = this;
    if (!swiper.params.scrollbar.el || !swiper.scrollbar.el) return;
    var scrollbar = swiper.scrollbar;
    var $dragEl = scrollbar.$dragEl,
        $el = scrollbar.$el;
    $dragEl[0].style.width = '';
    $dragEl[0].style.height = '';
    var trackSize = swiper.isHorizontal() ? $el[0].offsetWidth : $el[0].offsetHeight;
    var divider = swiper.size / swiper.virtualSize;
    var moveDivider = divider * (trackSize / swiper.size);
    var dragSize;

    if (swiper.params.scrollbar.dragSize === 'auto') {
      dragSize = trackSize * divider;
    } else {
      dragSize = parseInt(swiper.params.scrollbar.dragSize, 10);
    }

    if (swiper.isHorizontal()) {
      $dragEl[0].style.width = dragSize + "px";
    } else {
      $dragEl[0].style.height = dragSize + "px";
    }

    if (divider >= 1) {
      $el[0].style.display = 'none';
    } else {
      $el[0].style.display = '';
    }

    if (swiper.params.scrollbar.hide) {
      $el[0].style.opacity = 0;
    }

    extend(scrollbar, {
      trackSize: trackSize,
      divider: divider,
      moveDivider: moveDivider,
      dragSize: dragSize
    });
    scrollbar.$el[swiper.params.watchOverflow && swiper.isLocked ? 'addClass' : 'removeClass'](swiper.params.scrollbar.lockClass);
  },
  getPointerPosition: function getPointerPosition(e) {
    var swiper = this;

    if (swiper.isHorizontal()) {
      return e.type === 'touchstart' || e.type === 'touchmove' ? e.targetTouches[0].clientX : e.clientX;
    }

    return e.type === 'touchstart' || e.type === 'touchmove' ? e.targetTouches[0].clientY : e.clientY;
  },
  setDragPosition: function setDragPosition(e) {
    var swiper = this;
    var scrollbar = swiper.scrollbar,
        rtl = swiper.rtlTranslate;
    var $el = scrollbar.$el,
        dragSize = scrollbar.dragSize,
        trackSize = scrollbar.trackSize,
        dragStartPos = scrollbar.dragStartPos;
    var positionRatio;
    positionRatio = (scrollbar.getPointerPosition(e) - $el.offset()[swiper.isHorizontal() ? 'left' : 'top'] - (dragStartPos !== null ? dragStartPos : dragSize / 2)) / (trackSize - dragSize);
    positionRatio = Math.max(Math.min(positionRatio, 1), 0);

    if (rtl) {
      positionRatio = 1 - positionRatio;
    }

    var position = swiper.minTranslate() + (swiper.maxTranslate() - swiper.minTranslate()) * positionRatio;
    swiper.updateProgress(position);
    swiper.setTranslate(position);
    swiper.updateActiveIndex();
    swiper.updateSlidesClasses();
  },
  onDragStart: function onDragStart(e) {
    var swiper = this;
    var params = swiper.params.scrollbar;
    var scrollbar = swiper.scrollbar,
        $wrapperEl = swiper.$wrapperEl;
    var $el = scrollbar.$el,
        $dragEl = scrollbar.$dragEl;
    swiper.scrollbar.isTouched = true;
    swiper.scrollbar.dragStartPos = e.target === $dragEl[0] || e.target === $dragEl ? scrollbar.getPointerPosition(e) - e.target.getBoundingClientRect()[swiper.isHorizontal() ? 'left' : 'top'] : null;
    e.preventDefault();
    e.stopPropagation();
    $wrapperEl.transition(100);
    $dragEl.transition(100);
    scrollbar.setDragPosition(e);
    clearTimeout(swiper.scrollbar.dragTimeout);
    $el.transition(0);

    if (params.hide) {
      $el.css('opacity', 1);
    }

    if (swiper.params.cssMode) {
      swiper.$wrapperEl.css('scroll-snap-type', 'none');
    }

    swiper.emit('scrollbarDragStart', e);
  },
  onDragMove: function onDragMove(e) {
    var swiper = this;
    var scrollbar = swiper.scrollbar,
        $wrapperEl = swiper.$wrapperEl;
    var $el = scrollbar.$el,
        $dragEl = scrollbar.$dragEl;
    if (!swiper.scrollbar.isTouched) return;
    if (e.preventDefault) e.preventDefault();else e.returnValue = false;
    scrollbar.setDragPosition(e);
    $wrapperEl.transition(0);
    $el.transition(0);
    $dragEl.transition(0);
    swiper.emit('scrollbarDragMove', e);
  },
  onDragEnd: function onDragEnd(e) {
    var swiper = this;
    var params = swiper.params.scrollbar;
    var scrollbar = swiper.scrollbar,
        $wrapperEl = swiper.$wrapperEl;
    var $el = scrollbar.$el;
    if (!swiper.scrollbar.isTouched) return;
    swiper.scrollbar.isTouched = false;

    if (swiper.params.cssMode) {
      swiper.$wrapperEl.css('scroll-snap-type', '');
      $wrapperEl.transition('');
    }

    if (params.hide) {
      clearTimeout(swiper.scrollbar.dragTimeout);
      swiper.scrollbar.dragTimeout = nextTick(function () {
        $el.css('opacity', 0);
        $el.transition(400);
      }, 1000);
    }

    swiper.emit('scrollbarDragEnd', e);

    if (params.snapOnRelease) {
      swiper.slideToClosest();
    }
  },
  enableDraggable: function enableDraggable() {
    var swiper = this;
    if (!swiper.params.scrollbar.el) return;
    var document = getDocument();
    var scrollbar = swiper.scrollbar,
        touchEventsTouch = swiper.touchEventsTouch,
        touchEventsDesktop = swiper.touchEventsDesktop,
        params = swiper.params,
        support = swiper.support;
    var $el = scrollbar.$el;
    var target = $el[0];
    var activeListener = support.passiveListener && params.passiveListeners ? {
      passive: false,
      capture: false
    } : false;
    var passiveListener = support.passiveListener && params.passiveListeners ? {
      passive: true,
      capture: false
    } : false;

    if (!support.touch) {
      target.addEventListener(touchEventsDesktop.start, swiper.scrollbar.onDragStart, activeListener);
      document.addEventListener(touchEventsDesktop.move, swiper.scrollbar.onDragMove, activeListener);
      document.addEventListener(touchEventsDesktop.end, swiper.scrollbar.onDragEnd, passiveListener);
    } else {
      target.addEventListener(touchEventsTouch.start, swiper.scrollbar.onDragStart, activeListener);
      target.addEventListener(touchEventsTouch.move, swiper.scrollbar.onDragMove, activeListener);
      target.addEventListener(touchEventsTouch.end, swiper.scrollbar.onDragEnd, passiveListener);
    }
  },
  disableDraggable: function disableDraggable() {
    var swiper = this;
    if (!swiper.params.scrollbar.el) return;
    var document = getDocument();
    var scrollbar = swiper.scrollbar,
        touchEventsTouch = swiper.touchEventsTouch,
        touchEventsDesktop = swiper.touchEventsDesktop,
        params = swiper.params,
        support = swiper.support;
    var $el = scrollbar.$el;
    var target = $el[0];
    var activeListener = support.passiveListener && params.passiveListeners ? {
      passive: false,
      capture: false
    } : false;
    var passiveListener = support.passiveListener && params.passiveListeners ? {
      passive: true,
      capture: false
    } : false;

    if (!support.touch) {
      target.removeEventListener(touchEventsDesktop.start, swiper.scrollbar.onDragStart, activeListener);
      document.removeEventListener(touchEventsDesktop.move, swiper.scrollbar.onDragMove, activeListener);
      document.removeEventListener(touchEventsDesktop.end, swiper.scrollbar.onDragEnd, passiveListener);
    } else {
      target.removeEventListener(touchEventsTouch.start, swiper.scrollbar.onDragStart, activeListener);
      target.removeEventListener(touchEventsTouch.move, swiper.scrollbar.onDragMove, activeListener);
      target.removeEventListener(touchEventsTouch.end, swiper.scrollbar.onDragEnd, passiveListener);
    }
  },
  init: function init() {
    var swiper = this;
    if (!swiper.params.scrollbar.el) return;
    var scrollbar = swiper.scrollbar,
        $swiperEl = swiper.$el;
    var params = swiper.params.scrollbar;
    var $el = $(params.el);

    if (swiper.params.uniqueNavElements && typeof params.el === 'string' && $el.length > 1 && $swiperEl.find(params.el).length === 1) {
      $el = $swiperEl.find(params.el);
    }

    var $dragEl = $el.find("." + swiper.params.scrollbar.dragClass);

    if ($dragEl.length === 0) {
      $dragEl = $("<div class=\"" + swiper.params.scrollbar.dragClass + "\"></div>");
      $el.append($dragEl);
    }

    extend(scrollbar, {
      $el: $el,
      el: $el[0],
      $dragEl: $dragEl,
      dragEl: $dragEl[0]
    });

    if (params.draggable) {
      scrollbar.enableDraggable();
    }
  },
  destroy: function destroy() {
    var swiper = this;
    swiper.scrollbar.disableDraggable();
  }
};
export default {
  name: 'scrollbar',
  params: {
    scrollbar: {
      el: null,
      dragSize: 'auto',
      hide: false,
      draggable: false,
      snapOnRelease: true,
      lockClass: 'swiper-scrollbar-lock',
      dragClass: 'swiper-scrollbar-drag'
    }
  },
  create: function create() {
    var swiper = this;
    bindModuleMethods(swiper, {
      scrollbar: _extends({
        isTouched: false,
        timeout: null,
        dragTimeout: null
      }, Scrollbar)
    });
  },
  on: {
    init: function init(swiper) {
      swiper.scrollbar.init();
      swiper.scrollbar.updateSize();
      swiper.scrollbar.setTranslate();
    },
    update: function update(swiper) {
      swiper.scrollbar.updateSize();
    },
    resize: function resize(swiper) {
      swiper.scrollbar.updateSize();
    },
    observerUpdate: function observerUpdate(swiper) {
      swiper.scrollbar.updateSize();
    },
    setTranslate: function setTranslate(swiper) {
      swiper.scrollbar.setTranslate();
    },
    setTransition: function setTransition(swiper, duration) {
      swiper.scrollbar.setTransition(duration);
    },
    destroy: function destroy(swiper) {
      swiper.scrollbar.destroy();
    }
  }
};