react-tween/lib/TransitionGroup.js

Tween animation for React components

'use strict';

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

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; }; }();

var _d3Ease = require('d3-ease');

var _d3Interpolate = require('d3-interpolate');

var _lodash = require('lodash.isequal');

var _lodash2 = _interopRequireDefault(_lodash);

var _lodash3 = require('lodash.isundefined');

var _lodash4 = _interopRequireDefault(_lodash3);

var _react = require('react');

var _react2 = _interopRequireDefault(_react);

var _d3Timer = require('d3-timer');

var _mergeDiff = require('./mergeDiff');

var _mergeDiff2 = _interopRequireDefault(_mergeDiff);

var _toObject = require('./toObject');

var _toObject2 = _interopRequireDefault(_toObject);

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; }

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

  _createClass(TransitionGroup, null, [{
    key: 'getTransitionStyle',
    value: function getTransitionStyle(style) {
      return {
        key: style.key,
        style: style.currentStyle,
        data: style.data
      };
    }
  }]);

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

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

    var styles = props.styles;


    _this.state = {
      styles: styles.map(function (style) {
        return {
          key: style.key,
          startStyle: style.style,
          currentStyle: style.style,
          endStyle: style.style,
          data: style.data
        };
      })
    };

    _this.timer = (0, _d3Timer.timer)(function () {
      return _this.timer.stop();
    });
    return _this;
  }

  _createClass(TransitionGroup, [{
    key: 'componentWillReceiveProps',
    value: function componentWillReceiveProps(nextProps) {
      if ((0, _lodash4.default)(nextProps.group) ?
      // Don't animate if the new end styles are the same as the old end styles.
      // This prevents nested tweens from constantly restarting their animation because they keep receiving new props.
      (0, _lodash2.default)(this.state.styles.map(function (style) {
        return {
          key: style.key,
          style: style.endStyle
        };
      }), nextProps.styles.map(function (style) {
        return {
          key: style.key,
          style: style.style
        };
      })) : this.props.group === nextProps.group) {
        return;
      }

      var oldStyles = (0, _toObject2.default)(this.state.styles, function (style) {
        return style.key;
      });
      var newStyles = (0, _toObject2.default)(nextProps.styles, function (style) {
        return style.key;
      });
      var mergedKeys = (0, _mergeDiff2.default)(oldStyles, newStyles);

      var styles = mergedKeys.map(function (key) {
        if (Object.prototype.hasOwnProperty.call(oldStyles, key) && Object.prototype.hasOwnProperty.call(newStyles, key)) {
          // shared key case
          return {
            key: key,
            startStyle: oldStyles[key].currentStyle,
            currentStyle: oldStyles[key].currentStyle,
            endStyle: newStyles[key].style,
            data: newStyles[key].data
          };
        } else if (Object.prototype.hasOwnProperty.call(oldStyles, key)) {
          // removed key case
          var leaveStyle = nextProps.willLeave(TransitionGroup.getTransitionStyle(oldStyles[key]));

          return {
            key: key,
            startStyle: oldStyles[key].currentStyle,
            currentStyle: oldStyles[key].currentStyle,
            endStyle: leaveStyle,
            data: oldStyles[key].data
          };
        } else {
          // eslint-disable-line no-else-return
          // added key case
          var enterStyle = nextProps.willEnter(newStyles[key]);

          return {
            key: key,
            startStyle: enterStyle,
            currentStyle: enterStyle,
            endStyle: newStyles[key].style,
            data: newStyles[key].data
          };
        }
      });

      this.setState({ styles: styles });

      this.startTimer();
    }
  }, {
    key: 'componentWillUnmount',
    value: function componentWillUnmount() {
      this.stopTimer();
    }
  }, {
    key: 'startTimer',
    value: function startTimer() {
      var _this2 = this;

      var delay = this.props.delay;


      this.timer.restart(function (elapsed) {
        return _this2.update(elapsed);
      }, delay);
      this.running = true;
    }
  }, {
    key: 'stopTimer',
    value: function stopTimer() {
      if (!this.running) {
        return;
      }

      this.timer.stop();
      this.running = false;

      this.setState({
        styles: this.state.styles.map(function (style) {
          return _extends({}, style, {
            currentStyle: style.endStyle
          });
        })
      });
    }
  }, {
    key: 'update',
    value: function update(elapsed) {
      var _props = this.props,
          duration = _props.duration,
          easing = _props.easing;


      var t = elapsed / duration;
      var easedTime = easing(t);
      if (easedTime > 0.99) {
        this.stopTimer();
        return;
      }

      this.setState({
        styles: this.state.styles.map(function (style) {
          return _extends({}, style, {
            currentStyle: (0, _d3Interpolate.interpolate)(style.startStyle, style.endStyle)(easedTime)
          });
        })
      });
    }
  }, {
    key: 'render',
    value: function render() {
      var children = this.props.children;


      var styles = this.state.styles.map(TransitionGroup.getTransitionStyle);

      return children(styles);
    }
  }]);

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

TransitionGroup.propTypes = {
  children: _react2.default.PropTypes.func,
  delay: _react2.default.PropTypes.number,
  duration: _react2.default.PropTypes.number,
  easing: _react2.default.PropTypes.func,
  group: _react2.default.PropTypes.any, // eslint-disable-line react/forbid-prop-types
  styles: _react2.default.PropTypes.array, // eslint-disable-line react/forbid-prop-types
  willEnter: _react2.default.PropTypes.func, // eslint-disable-line react/no-unused-prop-types
  willLeave: _react2.default.PropTypes.func };
TransitionGroup.defaultProps = {
  delay: 0,
  duration: 500,
  easing: _d3Ease.easeCubicInOut,
  willEnter: function willEnter(style) {
    return style.style;
  },
  willLeave: function willLeave(style) {
    return style.style;
  }
};
exports.default = TransitionGroup;