react-slick/lib/track.js

React port of slick carousel

'use strict';

exports.__esModule = true;
exports.Track = undefined;

var _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; };

var _react = require('react');

var _react2 = _interopRequireDefault(_react);

var _classnames = require('classnames');

var _classnames2 = _interopRequireDefault(_classnames);

var _innerSliderUtils = require('./utils/innerSliderUtils');

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

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }

// given specifications/props for a slide, fetch all the classes that need to be applied to the slide
var getSlideClasses = function getSlideClasses(spec) {
  // if spec has currentSlideIndex, we can also apply slickCurrent class according to that (https://github.com/kenwheeler/slick/blob/master/slick/slick.js#L2300-L2302)
  var slickActive, slickCenter, slickCloned;
  var centerOffset, index;

  if (spec.rtl) {
    // if we're going right to left, index is reversed
    index = spec.slideCount - 1 - spec.index;
  } else {
    // index of the slide
    index = spec.index;
  }
  slickCloned = index < 0 || index >= spec.slideCount;
  if (spec.centerMode) {
    centerOffset = Math.floor(spec.slidesToShow / 2);
    slickCenter = (index - spec.currentSlide) % spec.slideCount === 0; // concern: not sure if this should be correct (https://github.com/kenwheeler/slick/blob/master/slick/slick.js#L2328-L2346)
    if (index > spec.currentSlide - centerOffset - 1 && index <= spec.currentSlide + centerOffset) {
      slickActive = true;
    }
  } else {
    // concern: following can be incorrect in case where currentSlide is lastSlide in frame and rest of the slides to show have index smaller than currentSlideIndex
    slickActive = spec.currentSlide <= index && index < spec.currentSlide + spec.slidesToShow;
  }
  var slickCurrent = index === spec.currentSlide;
  return (0, _classnames2.default)({
    'slick-slide': true,
    'slick-active': slickActive,
    'slick-center': slickCenter,
    'slick-cloned': slickCloned,
    'slick-current': slickCurrent // dubious in case of RTL
  });
};

var getSlideStyle = function getSlideStyle(spec) {
  var style = {};

  if (spec.variableWidth === undefined || spec.variableWidth === false) {
    style.width = spec.slideWidth;
  }

  if (spec.fade) {
    style.position = 'relative';
    if (spec.vertical) {
      style.top = -spec.index * spec.slideHeight;
    } else {
      style.left = -spec.index * spec.slideWidth;
    }
    style.opacity = spec.currentSlide === spec.index ? 1 : 0;
    style.transition = 'opacity ' + spec.speed + 'ms ' + spec.cssEase + ', ' + 'visibility ' + spec.speed + 'ms ' + spec.cssEase;
    style.WebkitTransition = 'opacity ' + spec.speed + 'ms ' + spec.cssEase + ', ' + 'visibility ' + spec.speed + 'ms ' + spec.cssEase;
  }

  return style;
};

var getKey = function getKey(child, fallbackKey) {
  return child.key || fallbackKey;
};

var renderSlides = function renderSlides(spec) {
  var key;
  var slides = [];
  var preCloneSlides = [];
  var postCloneSlides = [];
  var childrenCount = _react2.default.Children.count(spec.children);
  var startIndex = (0, _innerSliderUtils.lazyStartIndex)(spec);
  var endIndex = (0, _innerSliderUtils.lazyEndIndex)(spec);

  _react2.default.Children.forEach(spec.children, function (elem, index) {
    var child = void 0;
    var childOnClickOptions = {
      message: 'children',
      index: index,
      slidesToScroll: spec.slidesToScroll,
      currentSlide: spec.currentSlide
    };

    // in case of lazyLoad, whether or not we want to fetch the slide
    if (!spec.lazyLoad || spec.lazyLoad && spec.lazyLoadedList.indexOf(index) >= 0) {
      child = elem;
    } else {
      child = _react2.default.createElement('div', null);
    }
    var childStyle = getSlideStyle(_extends({}, spec, { index: index }));
    var slideClass = child.props.className || '';

    // push a cloned element of the desired slide
    slides.push(_react2.default.cloneElement(child, {
      key: 'original' + getKey(child, index),
      'data-index': index,
      className: (0, _classnames2.default)(getSlideClasses(_extends({}, spec, { index: index })), slideClass),
      tabIndex: '-1',
      style: _extends({ outline: 'none' }, child.props.style || {}, childStyle),
      onClick: function onClick(e) {
        child.props && child.props.onClick && child.props.onClick(e);
        if (spec.focusOnSelect) {
          spec.focusOnSelect(childOnClickOptions);
        }
      }
    }));

    // if slide needs to be precloned or postcloned
    if (spec.infinite && spec.fade === false) {
      var preCloneNo = childrenCount - index;
      if (preCloneNo <= (0, _innerSliderUtils.getPreClones)(spec) && childrenCount !== spec.slidesToShow) {
        key = -preCloneNo;
        if (key >= startIndex) {
          child = elem;
        }
        preCloneSlides.push(_react2.default.cloneElement(child, {
          key: 'precloned' + getKey(child, key),
          'data-index': key,
          tabIndex: '-1',
          className: (0, _classnames2.default)(getSlideClasses(_extends({}, spec, { index: key })), slideClass),
          style: _extends({}, child.props.style || {}, childStyle),
          onClick: function onClick(e) {
            child.props && child.props.onClick && child.props.onClick(e);
            if (spec.focusOnSelect) {
              spec.focusOnSelect(childOnClickOptions);
            }
          }
        }));
      }

      if (childrenCount !== spec.slidesToShow) {
        key = childrenCount + index;
        if (key < endIndex) {
          child = elem;
        }
        postCloneSlides.push(_react2.default.cloneElement(child, {
          key: 'postcloned' + getKey(child, key),
          'data-index': key,
          tabIndex: '-1',
          className: (0, _classnames2.default)(getSlideClasses(_extends({}, spec, { index: key })), slideClass),
          style: _extends({}, child.props.style || {}, childStyle),
          onClick: function onClick(e) {
            child.props && child.props.onClick && child.props.onClick(e);
            if (spec.focusOnSelect) {
              spec.focusOnSelect(childOnClickOptions);
            }
          }
        }));
      }
    }
  });

  if (spec.rtl) {
    return preCloneSlides.concat(slides, postCloneSlides).reverse();
  } else {
    return preCloneSlides.concat(slides, postCloneSlides);
  }
};

var Track = exports.Track = function (_React$Component) {
  _inherits(Track, _React$Component);

  function Track() {
    _classCallCheck(this, Track);

    return _possibleConstructorReturn(this, _React$Component.apply(this, arguments));
  }

  Track.prototype.render = function render() {
    var slides = renderSlides(this.props);
    var _props = this.props,
        onMouseEnter = _props.onMouseEnter,
        onMouseOver = _props.onMouseOver,
        onMouseLeave = _props.onMouseLeave;

    var mouseEvents = { onMouseEnter: onMouseEnter, onMouseOver: onMouseOver, onMouseLeave: onMouseLeave };
    return _react2.default.createElement(
      'div',
      _extends({ className: 'slick-track', style: this.props.trackStyle }, mouseEvents),
      slides
    );
  };

  return Track;
}(_react2.default.Component);