react-crossfade-image/index.es5.js

Simple React component for crossfading images

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 _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

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; }

import React, { Component } from "react";
import PropTypes from "prop-types";

var CrossfadeImage = function (_Component) {
  _inherits(CrossfadeImage, _Component);

  function CrossfadeImage(props) {
    _classCallCheck(this, CrossfadeImage);

    var _this = _possibleConstructorReturn(this, (CrossfadeImage.__proto__ || Object.getPrototypeOf(CrossfadeImage)).call(this, props));

    _this.state = {
      topSrc: props.src,
      bottomOpacity: 0,
      bottomSrc: props.src
    };
    return _this;
  }

  _createClass(CrossfadeImage, [{
    key: "componentWillReceiveProps",
    value: function componentWillReceiveProps(newProps) {
      var _this2 = this;

      var oldSrc = this.state.topSrc;
      var newSrc = newProps.src;
      if (newSrc !== oldSrc) {
        // Reset the component everytime we receive new prop, to
        // cancel out any animation that's still going on
        this.setState({ bottomSrc: false, topSrc: false }, function () {
          return _this2.setState(
          // Opacity less than 1 takes precendence in stacking order
          { bottomSrc: oldSrc, topSrc: newSrc, bottomOpacity: 0.99 }, function () {
            // One of the few times setTimeout does wonders, this is for
            // getting fade out transition without css keyframe
            if (!_this2.timeout) clearTimeout(_this2.timeout);
            _this2.timeout = setTimeout(function () {
              return _this2.setState({ bottomOpacity: 0 });
            }, 20);
          });
        });
      }
    }
  }, {
    key: "render",
    value: function render() {
      var _props = this.props,
          containerClass = _props.containerClass,
          duration = _props.duration,
          timingFunction = _props.timingFunction,
          delay = _props.delay,
          style = _props.style,
          alt = _props.alt;
      var _state = this.state,
          topSrc = _state.topSrc,
          bottomOpacity = _state.bottomOpacity,
          bottomSrc = _state.bottomSrc;

      return React.createElement(
        "div",
        { className: containerClass, style: _extends({}, defaultStyle, { position: "relative" }) },
        topSrc && React.createElement("img", {
          style: _extends({}, defaultStyle, style, { position: "absolute" }),
          src: topSrc,
          alt: alt
        }),
        bottomSrc && React.createElement("img", {
          style: _extends({}, defaultStyle, style, {
            opacity: bottomOpacity,
            transition: "opacity " + duration / 1000 + "s " + timingFunction + " " + delay / 1000 + "s"
          }),
          src: bottomSrc
        })
      );
    }
  }]);

  return CrossfadeImage;
}(Component);

export default CrossfadeImage;


var defaultStyle = { maxWidth: "100%", maxHeight: "100%" };

CrossfadeImage.propTypes = {
  src: PropTypes.string.isRequired,
  alt: PropTypes.string,
  duration: PropTypes.number,
  timingFunction: PropTypes.string,
  delay: PropTypes.number,
  style: PropTypes.object,
  containerClass: PropTypes.string
};

CrossfadeImage.defaultProps = {
  duration: 500,
  timingFunction: "ease",
  delay: 0,
  containerClass: "CrossfadeImage"
};