rc-banner-anim/es/BgElement.js

banner-anim animation component for react

import _extends from 'babel-runtime/helpers/extends';
import _classCallCheck from 'babel-runtime/helpers/classCallCheck';
import _possibleConstructorReturn from 'babel-runtime/helpers/possibleConstructorReturn';
import _inherits from 'babel-runtime/helpers/inherits';
import React from 'react';
import ReactDOM from 'react-dom';
import PropTypes from 'prop-types';
import Tween from 'rc-tween-one/es/Tween';
import { stylesToCss } from 'style-utils';
import { currentScrollTop, toArrayChildren, windowHeight } from './utils';
import animType from './anim';

var BgElement = function (_React$Component) {
  _inherits(BgElement, _React$Component);

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

    var _this = _possibleConstructorReturn(this, _React$Component.call(this, props));

    _this.onScroll = function () {
      var scrollTop = currentScrollTop();
      var domRect = _this.dom.parentNode.getBoundingClientRect();
      var offsetTop = domRect.top + scrollTop;
      var height = Math.max(domRect.height, windowHeight());
      var elementShowHeight = scrollTop - offsetTop + height;
      var scale = elementShowHeight / (height + domRect.height);
      scale = scale || 0;
      scale = scale >= 1 ? 1 : scale;
      _this.tween.frame(scale * _this.scrollParallaxDuration);
    };

    _this.onResize = function () {
      if (!_this.props.show) {
        return;
      }
      var domRect = _this.dom.getBoundingClientRect();
      var videoDomRect = _this.video.getBoundingClientRect();
      _this.videoLoad = true;
      var scale = void 0;
      var videoRect = {
        display: 'block',
        position: 'relative',
        top: 0,
        left: 0
      };
      if (domRect.width / domRect.height > videoDomRect.width / videoDomRect.height) {
        scale = domRect.width / videoDomRect.width;
        videoRect.width = domRect.width;
        videoRect.height = videoDomRect.height * scale;
        videoRect.top = -(videoRect.height - domRect.height) / 2;
      } else {
        scale = domRect.height / videoDomRect.height;
        videoRect.height = domRect.height;
        videoRect.width = videoDomRect.width * scale;
        videoRect.left = -(videoRect.width - domRect.width) / 2;
      }

      Object.keys(videoRect).forEach(function (key) {
        _this.video.style[key] = stylesToCss(key, videoRect[key]);
      });
    };

    _this.videoLoadedData = function () {
      _this.onResize();
      if (window.addEventListener) {
        window.addEventListener('resize', _this.onResize);
      } else {
        window.attachEvent('onresize', _this.onResize);
      }
    };

    _this.isVideo = toArrayChildren(_this.props.children).some(function (item) {
      return item.type === 'video';
    });
    if (_this.isVideo) {
      // 如果是 video，删除 grid 系列，位置发生变化，重加载了 video;
      delete animType.grid;
      delete animType.gridBar;
    }
    if (_this.props.scrollParallax) {
      _this.scrollParallaxDuration = _this.props.scrollParallax.duration || 450;
    }
    _this.video = null;
    _this.videoLoad = false;
    return _this;
  }

  BgElement.prototype.componentDidMount = function componentDidMount() {
    this.dom = ReactDOM.findDOMNode(this);
    if (!this.videoLoad) {
      if (this.video && this.props.videoResize) {
        this.video.onloadeddata = this.videoLoadedData;
      }
    }
    if (this.props.scrollParallax) {
      this.tween = new Tween(this.dom, [_extends({
        ease: 'linear' }, this.props.scrollParallax)], { attr: 'style' });
      this.tween.frame(0);
      this.onScroll();
      if (window.addEventListener) {
        window.addEventListener('scroll', this.onScroll);
      } else {
        window.attachEvent('onscroll', this.onScroll);
      }
    }
  };

  BgElement.prototype.componentWillReceiveProps = function componentWillReceiveProps(nextProps) {
    var _this2 = this;

    if (nextProps.show) {
      // 取 dom 在 render 之后；
      setTimeout(function () {
        if (_this2.video && _this2.props.videoResize && _this2.videoLoad) {
          _this2.onResize();
        }
        if (_this2.props.scrollParallax) {
          _this2.onScroll();
        }
      });
    }
  };

  BgElement.prototype.componentWillUnmount = function componentWillUnmount() {
    if (window.addEventListener) {
      window.removeEventListener('resize', this.onResize);
      window.removeEventListener('scroll', this.onScroll);
    } else {
      window.detachEvent('onresize', this.onResize);
      window.detachEvent('onscroll', this.onScroll);
    }
  };

  BgElement.prototype.render = function render() {
    var _this3 = this;

    var props = _extends({}, this.props);
    ['videoResize', 'scrollParallax', 'scrollParallaxDuration', 'show', 'component'].forEach(function (key) {
      return delete props[key];
    });
    if (this.isVideo && this.props.videoResize) {
      var children = toArrayChildren(props.children).map(function (item, i) {
        return React.cloneElement(item, _extends({}, item.props, { key: item.key || 'bg-video-' + i, ref: function ref(c) {
            _this3.video = c;
            if (typeof item.ref === 'function') {
              item.ref(c);
            }
          }
        }));
      });
      props.children = children.length === 1 ? children[0] : children;
    }
    return React.createElement(this.props.component, props);
  };

  return BgElement;
}(React.Component);

export default BgElement;


BgElement.propTypes = {
  className: PropTypes.string,
  style: PropTypes.object,
  children: PropTypes.any,
  component: PropTypes.any,
  videoResize: PropTypes.bool,
  scrollParallax: PropTypes.object,
  show: PropTypes.bool
};

BgElement.defaultProps = {
  component: 'div',
  videoResize: true
};

BgElement.isBannerAnimBgElement = true;