rc-banner-anim/lib/BgElement.js

banner-anim animation component for react

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _objectWithoutProperties2 = require('babel-runtime/helpers/objectWithoutProperties');

var _objectWithoutProperties3 = _interopRequireDefault(_objectWithoutProperties2);

var _extends2 = require('babel-runtime/helpers/extends');

var _extends3 = _interopRequireDefault(_extends2);

var _classCallCheck2 = require('babel-runtime/helpers/classCallCheck');

var _classCallCheck3 = _interopRequireDefault(_classCallCheck2);

var _possibleConstructorReturn2 = require('babel-runtime/helpers/possibleConstructorReturn');

var _possibleConstructorReturn3 = _interopRequireDefault(_possibleConstructorReturn2);

var _createClass2 = require('babel-runtime/helpers/createClass');

var _createClass3 = _interopRequireDefault(_createClass2);

var _inherits2 = require('babel-runtime/helpers/inherits');

var _inherits3 = _interopRequireDefault(_inherits2);

var _react = require('react');

var _react2 = _interopRequireDefault(_react);

var _reactDom = require('react-dom');

var _reactDom2 = _interopRequireDefault(_reactDom);

var _propTypes = require('prop-types');

var _propTypes2 = _interopRequireDefault(_propTypes);

var _rcTweenOne = require('rc-tween-one');

var _styleUtils = require('style-utils');

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

var _anim = require('./anim');

var _anim2 = _interopRequireDefault(_anim);

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

var BgElement = function (_React$Component) {
  (0, _inherits3['default'])(BgElement, _React$Component);
  (0, _createClass3['default'])(BgElement, null, [{
    key: 'getDerivedStateFromProps',
    value: function getDerivedStateFromProps(props, _ref) {
      var prevProps = _ref.prevProps,
          $self = _ref.$self;

      var nextState = {
        prevProps: props
      };
      if (prevProps && props !== prevProps) {
        if (props.show) {
          // 取 dom 在 render 之后；
          setTimeout(function () {
            if ($self.video && prevProps.videoResize && $self.videoLoad) {
              $self.onResize();
            }
            if (prevProps.scrollParallax) {
              $self.onScroll();
            }
          });
        }
      }
      return nextState;
    }
  }]);

  function BgElement(props) {
    (0, _classCallCheck3['default'])(this, BgElement);

    var _this = (0, _possibleConstructorReturn3['default'])(this, (BgElement.__proto__ || Object.getPrototypeOf(BgElement)).call(this, props));

    _this.onScroll = function () {
      var scrollTop = (0, _utils.currentScrollTop)();
      var domRect = _this.dom.parentNode.getBoundingClientRect();
      var offsetTop = domRect.top + scrollTop;
      var height = Math.max(domRect.height, (0, _utils.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] = (0, _styleUtils.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 = (0, _utils.toArrayChildren)(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 _anim2['default'].grid;
      delete _anim2['default'].gridBar;
    }
    if (props.scrollParallax) {
      _this.scrollParallaxDuration = props.scrollParallax.duration || 450;
    }
    _this.video = null;
    _this.videoLoad = false;
    _this.state = {
      $self: _this
    };
    return _this;
  }

  (0, _createClass3['default'])(BgElement, [{
    key: 'componentDidMount',
    value: function componentDidMount() {
      this.dom = _reactDom2['default'].findDOMNode(this);
      if (!this.videoLoad) {
        if (this.video && this.props.videoResize) {
          this.video.onloadeddata = this.videoLoadedData;
        }
      }
      if (this.props.scrollParallax) {
        this.tween = new _rcTweenOne.Tween(this.dom, [(0, _extends3['default'])({
          ease: 'linear' }, this.props.scrollParallax)]);
        this.tween.init();
        this.onScroll();
        if (window.addEventListener) {
          window.addEventListener('scroll', this.onScroll);
        } else {
          window.attachEvent('onscroll', this.onScroll);
        }
      }
    }
  }, {
    key: 'componentWillUnmount',
    value: 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);
      }
    }
  }, {
    key: 'render',
    value: function render() {
      var _this2 = this;

      var _props = this.props,
          videoResize = _props.videoResize,
          scrollParallax = _props.scrollParallax,
          show = _props.show,
          component = _props.component,
          componentProps = _props.componentProps,
          props = (0, _objectWithoutProperties3['default'])(_props, ['videoResize', 'scrollParallax', 'show', 'component', 'componentProps']);

      if (this.isVideo && videoResize) {
        var children = (0, _utils.toArrayChildren)(props.children).map(function (item, i) {
          return _react2['default'].cloneElement(item, (0, _extends3['default'])({}, item.props, { key: item.key || 'bg-video-' + i, ref: function ref(c) {
              _this2.video = c;
              if (typeof item.ref === 'function') {
                item.ref(c);
              }
            }
          }));
        });
        props.children = children.length === 1 ? children[0] : children;
      }
      return _react2['default'].createElement(this.props.component, (0, _extends3['default'])({}, props, componentProps));
    }
  }]);
  return BgElement;
}(_react2['default'].Component);

exports['default'] = BgElement;


BgElement.propTypes = {
  className: _propTypes2['default'].string,
  style: _propTypes2['default'].object,
  children: _propTypes2['default'].any,
  component: _propTypes2['default'].any,
  videoResize: _propTypes2['default'].bool,
  scrollParallax: _propTypes2['default'].object,
  show: _propTypes2['default'].bool,
  componentProps: _propTypes2['default'].object
};

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

BgElement.isBannerAnimBgElement = true;
module.exports = exports['default'];