✏️ Editing: Transition.js

import _objectWithoutPropertiesLoose from "@babel/runtime/helpers/esm/objectWithoutPropertiesLoose";
import _inheritsLoose from "@babel/runtime/helpers/esm/inheritsLoose";
import PropTypes from 'prop-types';
import React from 'react';
import ReactDOM from 'react-dom';
import config from './config';
import { timeoutsShape } from './utils/PropTypes';
import TransitionGroupContext from './TransitionGroupContext';
import { forceReflow } from './utils/reflow';
export var UNMOUNTED = 'unmounted';
export var EXITED = 'exited';
export var ENTERING = 'entering';
export var ENTERED = 'entered';
export var EXITING = 'exiting';
/**
 * The Transition component lets you describe a transition from one component
 * state to another _over time_ with a simple declarative API. Most commonly
 * it's used to animate the mounting and unmounting of a component, but can also
 * be used to describe in-place transition states as well.
 *
 * ---
 *
 * **Note**: `Transition` is a platform-agnostic base component. If you're using
 * transitions in CSS, you'll probably want to use
 * [`CSSTransition`](https://reactcommunity.org/react-transition-group/css-transition)
 * instead. It inherits all the features of `Transition`, but contains
 * additional features necessary to play nice with CSS transitions (hence the
 * name of the component).
 *
 * ---
 *
 * By default the `Transition` component does not alter the behavior of the
 * component it renders, it only tracks "enter" and "exit" states for the
 * components. It's up to you to give meaning and effect to those states. For
 * example we can add styles to a component when it enters or exits:
 *
 * ```jsx
 * import { Transition } from 'react-transition-group';
 *
 * const duration = 300;
 *
 * const defaultStyle = {
 *   transition: `opacity ${duration}ms ease-in-out`,
 *   opacity: 0,
 * }
 *
 * const transitionStyles = {
 *   entering: { opacity: 1 },
 *   entered:  { opacity: 1 },
 *   exiting:  { opacity: 0 },
 *   exited:  { opacity: 0 },
 * };
 *
 * const Fade = ({ in: inProp }) => (
 *   <Transition in={inProp} timeout={duration}>
 *     {state => (
 *       <div style={{
 *         ...defaultStyle,
 *         ...transitionStyles[state]
 *       }}>
 *         I'm a fade Transition!
 *       </div>
 *     )}
 *   </Transition>
 * );
 * ```
 *
 * There are 4 main states a Transition can be in:
 *  - `'entering'`
 *  - `'entered'`
 *  - `'exiting'`
 *  - `'exited'`
 *
 * Transition state is toggled via the `in` prop. When `true` the component
 * begins the "Enter" stage. During this stage, the component will shift from
 * its current transition state, to `'entering'` for the duration of the
 * transition and then to the `'entered'` stage once it's complete. Let's take
 * the following example (we'll use the
 * [useState](https://reactjs.org/docs/hooks-reference.html#usestate) hook):
 *
 * ```jsx
 * function App() {
 *   const [inProp, setInProp] = useState(false);
 *   return (
 *     <div>
 *       <Transition in={inProp} timeout={500}>
 *         {state => (
 *           // ...
 *         )}
 *       </Transition>
 *       <button onClick={() => setInProp(true)}>
 *         Click to Enter
 *       </button>
 *     </div>
 *   );
 * }
 * ```
 *
 * When the button is clicked the component will shift to the `'entering'` state
 * and stay there for 500ms (the value of `timeout`) before it finally switches
 * to `'entered'`.
 *
 * When `in` is `false` the same thing happens except the state moves from
 * `'exiting'` to `'exited'`.
 */

var Transition = /*#__PURE__*/function (_React$Component) {
  _inheritsLoose(Transition, _React$Component);

function Transition(props, context) {
    var _this;

_this = _React$Component.call(this, props, context) || this;
    var parentGroup = context; // In the context of a TransitionGroup all enters are really appears

var appear = parentGroup && !parentGroup.isMounting ? props.enter : props.appear;
    var initialStatus;
    _this.appearStatus = null;

if (props.in) {
      if (appear) {
        initialStatus = EXITED;
        _this.appearStatus = ENTERING;
      } else {
        initialStatus = ENTERED;
      }
    } else {
      if (props.unmountOnExit || props.mountOnEnter) {
        initialStatus = UNMOUNTED;
      } else {
        initialStatus = EXITED;
      }
    }

_this.state = {
      status: initialStatus
    };
    _this.nextCallback = null;
    return _this;
  }

Transition.getDerivedStateFromProps = function getDerivedStateFromProps(_ref, prevState) {
    var nextIn = _ref.in;

if (nextIn && prevState.status === UNMOUNTED) {
      return {
        status: EXITED
      };
    }

return null;
  } // getSnapshotBeforeUpdate(prevProps) {
  //   let nextStatus = null
  //   if (prevProps !== this.props) {
  //     const { status } = this.state
  //     if (this.props.in) {
  //       if (status !== ENTERING && status !== ENTERED) {
  //         nextStatus = ENTERING
  //       }
  //     } else {
  //       if (status === ENTERING || status === ENTERED) {
  //         nextStatus = EXITING
  //       }
  //     }
  //   }
  //   return { nextStatus }
  // }
  ;

var _proto = Transition.prototype;

_proto.componentDidMount = function componentDidMount() {
    this.updateStatus(true, this.appearStatus);
  };

_proto.componentDidUpdate = function componentDidUpdate(prevProps) {
    var nextStatus = null;

if (prevProps !== this.props) {
      var status = this.state.status;

if (this.props.in) {
        if (status !== ENTERING && status !== ENTERED) {
          nextStatus = ENTERING;
        }
      } else {
        if (status === ENTERING || status === ENTERED) {
          nextStatus = EXITING;
        }
      }
    }

this.updateStatus(false, nextStatus);
  };

_proto.componentWillUnmount = function componentWillUnmount() {
    this.cancelNextCallback();
  };

_proto.getTimeouts = function getTimeouts() {
    var timeout = this.props.timeout;
    var exit, enter, appear;
    exit = enter = appear = timeout;

if (timeout != null && typeof timeout !== 'number') {
      exit = timeout.exit;
      enter = timeout.enter; // TODO: remove fallback for next major

appear = timeout.appear !== undefined ? timeout.appear : enter;
    }

return {
      exit: exit,
      enter: enter,
      appear: appear
    };
  };

_proto.updateStatus = function updateStatus(mounting, nextStatus) {
    if (mounting === void 0) {
      mounting = false;
    }

if (nextStatus !== null) {
      // nextStatus will always be ENTERING or EXITING.
      this.cancelNextCallback();

if (nextStatus === ENTERING) {
        if (this.props.unmountOnExit || this.props.mountOnEnter) {
          var node = this.props.nodeRef ? this.props.nodeRef.current : ReactDOM.findDOMNode(this); // https://github.com/reactjs/react-transition-group/pull/749
          // With unmountOnExit or mountOnEnter, the enter animation should happen at the transition between `exited` and `entering`.
          // To make the animation happen,  we have to separate each rendering and avoid being processed as batched.

if (node) forceReflow(node);
        }

this.performEnter(mounting);
      } else {
        this.performExit();
      }
    } else if (this.props.unmountOnExit && this.state.status === EXITED) {
      this.setState({
        status: UNMOUNTED
      });
    }
  };

_proto.performEnter = function performEnter(mounting) {
    var _this2 = this;

var enter = this.props.enter;
    var appearing = this.context ? this.context.isMounting : mounting;

var _ref2 = this.props.nodeRef ? [appearing] : [ReactDOM.findDOMNode(this), appearing],
        maybeNode = _ref2[0],
        maybeAppearing = _ref2[1];

var timeouts = this.getTimeouts();
    var enterTimeout = appearing ? timeouts.appear : timeouts.enter; // no enter animation skip right to ENTERED
    // if we are mounting and running this it means appear _must_ be set

if (!mounting && !enter || config.disabled) {
      this.safeSetState({
        status: ENTERED
      }, function () {
        _this2.props.onEntered(maybeNode);
      });
      return;
    }

this.props.onEnter(maybeNode, maybeAppearing);
    this.safeSetState({
      status: ENTERING
    }, function () {
      _this2.props.onEntering(maybeNode, maybeAppearing);

_this2.onTransitionEnd(enterTimeout, function () {
        _this2.safeSetState({
          status: ENTERED
        }, function () {
          _this2.props.onEntered(maybeNode, maybeAppearing);
        });
      });
    });
  };

_proto.performExit = function performExit() {
    var _this3 = this;

var exit = this.props.exit;
    var timeouts = this.getTimeouts();
    var maybeNode = this.props.nodeRef ? undefined : ReactDOM.findDOMNode(this); // no exit animation skip right to EXITED

if (!exit || config.disabled) {
      this.safeSetState({
        status: EXITED
      }, function () {
        _this3.props.onExited(maybeNode);
      });
      return;
    }

this.props.onExit(maybeNode);
    this.safeSetState({
      status: EXITING
    }, function () {
      _this3.props.onExiting(maybeNode);

_this3.onTransitionEnd(timeouts.exit, function () {
        _this3.safeSetState({
          status: EXITED
        }, function () {
          _this3.props.onExited(maybeNode);
        });
      });
    });
  };

_proto.cancelNextCallback = function cancelNextCallback() {
    if (this.nextCallback !== null) {
      this.nextCallback.cancel();
      this.nextCallback = null;
    }
  };

_proto.safeSetState = function safeSetState(nextState, callback) {
    // This shouldn't be necessary, but there are weird race conditions with
    // setState callbacks and unmounting in testing, so always make sure that
    // we can cancel any pending setState callbacks after we unmount.
    callback = this.setNextCallback(callback);
    this.setState(nextState, callback);
  };

_proto.setNextCallback = function setNextCallback(callback) {
    var _this4 = this;

var active = true;

this.nextCallback = function (event) {
      if (active) {
        active = false;
        _this4.nextCallback = null;
        callback(event);
      }
    };

this.nextCallback.cancel = function () {
      active = false;
    };

return this.nextCallback;
  };

_proto.onTransitionEnd = function onTransitionEnd(timeout, handler) {
    this.setNextCallback(handler);
    var node = this.props.nodeRef ? this.props.nodeRef.current : ReactDOM.findDOMNode(this);
    var doesNotHaveTimeoutOrListener = timeout == null && !this.props.addEndListener;

if (!node || doesNotHaveTimeoutOrListener) {
      setTimeout(this.nextCallback, 0);
      return;
    }

if (this.props.addEndListener) {
      var _ref3 = this.props.nodeRef ? [this.nextCallback] : [node, this.nextCallback],
          maybeNode = _ref3[0],
          maybeNextCallback = _ref3[1];

this.props.addEndListener(maybeNode, maybeNextCallback);
    }

if (timeout != null) {
      setTimeout(this.nextCallback, timeout);
    }
  };

_proto.render = function render() {
    var status = this.state.status;

if (status === UNMOUNTED) {
      return null;
    }

var _this$props = this.props,
        children = _this$props.children,
        _in = _this$props.in,
        _mountOnEnter = _this$props.mountOnEnter,
        _unmountOnExit = _this$props.unmountOnExit,
        _appear = _this$props.appear,
        _enter = _this$props.enter,
        _exit = _this$props.exit,
        _timeout = _this$props.timeout,
        _addEndListener = _this$props.addEndListener,
        _onEnter = _this$props.onEnter,
        _onEntering = _this$props.onEntering,
        _onEntered = _this$props.onEntered,
        _onExit = _this$props.onExit,
        _onExiting = _this$props.onExiting,
        _onExited = _this$props.onExited,
        _nodeRef = _this$props.nodeRef,
        childProps = _objectWithoutPropertiesLoose(_this$props, ["children", "in", "mountOnEnter", "unmountOnExit", "appear", "enter", "exit", "timeout", "addEndListener", "onEnter", "onEntering", "onEntered", "onExit", "onExiting", "onExited", "nodeRef"]);

return (
      /*#__PURE__*/
      // allows for nested Transitions
      React.createElement(TransitionGroupContext.Provider, {
        value: null
      }, typeof children === 'function' ? children(status, childProps) : React.cloneElement(React.Children.only(children), childProps))
    );
  };

return Transition;
}(React.Component);

Transition.contextType = TransitionGroupContext;
Transition.propTypes = process.env.NODE_ENV !== "production" ? {
  /**
   * A React reference to DOM element that need to transition:
   * https://stackoverflow.com/a/51127130/4671932
   *
   *   - When `nodeRef` prop is used, `node` is not passed to callback functions
   *      (e.g. `onEnter`) because user already has direct access to the node.
   *   - When changing `key` prop of `Transition` in a `TransitionGroup` a new
   *     `nodeRef` need to be provided to `Transition` with changed `key` prop
   *     (see
   *     [test/CSSTransition-test.js](https://github.com/reactjs/react-transition-group/blob/13435f897b3ab71f6e19d724f145596f5910581c/test/CSSTransition-test.js#L362-L437)).
   */
  nodeRef: PropTypes.shape({
    current: typeof Element === 'undefined' ? PropTypes.any : function (propValue, key, componentName, location, propFullName, secret) {
      var value = propValue[key];
      return PropTypes.instanceOf(value && 'ownerDocument' in value ? value.ownerDocument.defaultView.Element : Element)(propValue, key, componentName, location, propFullName, secret);
    }
  }),

/**
   * A `function` child can be used instead of a React element. This function is
   * called with the current transition status (`'entering'`, `'entered'`,
   * `'exiting'`, `'exited'`), which can be used to apply context
   * specific props to a component.
   *
   * ```jsx
   * <Transition in={this.state.in} timeout={150}>
   *   {state => (
   *     <MyComponent className={`fade fade-${state}`} />
   *   )}
   * </Transition>
   * ```
   */
  children: PropTypes.oneOfType([PropTypes.func.isRequired, PropTypes.element.isRequired]).isRequired,

/**
   * Show the component; triggers the enter or exit states
   */
  in: PropTypes.bool,

/**
   * By default the child component is mounted immediately along with
   * the parent `Transition` component. If you want to "lazy mount" the component on the
   * first `in={true}` you can set `mountOnEnter`. After the first enter transition the component will stay
   * mounted, even on "exited", unless you also specify `unmountOnExit`.
   */
  mountOnEnter: PropTypes.bool,

/**
   * By default the child component stays mounted after it reaches the `'exited'` state.
   * Set `unmountOnExit` if you'd prefer to unmount the component after it finishes exiting.
   */
  unmountOnExit: PropTypes.bool,

/**
   * By default the child component does not perform the enter transition when
   * it first mounts, regardless of the value of `in`. If you want this
   * behavior, set both `appear` and `in` to `true`.
   *
   * > **Note**: there are no special appear states like `appearing`/`appeared`, this prop
   * > only adds an additional enter transition. However, in the
   * > `<CSSTransition>` component that first enter transition does result in
   * > additional `.appear-*` classes, that way you can choose to style it
   * > differently.
   */
  appear: PropTypes.bool,

/**
   * Enable or disable enter transitions.
   */
  enter: PropTypes.bool,

/**
   * Enable or disable exit transitions.
   */
  exit: PropTypes.bool,

/**
   * The duration of the transition, in milliseconds.
   * Required unless `addEndListener` is provided.
   *
   * You may specify a single timeout for all transitions:
   *
   * ```jsx
   * timeout={500}
   * ```
   *
   * or individually:
   *
   * ```jsx
   * timeout={{
   *  appear: 500,
   *  enter: 300,
   *  exit: 500,
   * }}
   * ```
   *
   * - `appear` defaults to the value of `enter`
   * - `enter` defaults to `0`
   * - `exit` defaults to `0`
   *
   * @type {number | { enter?: number, exit?: number, appear?: number }}
   */
  timeout: function timeout(props) {
    var pt = timeoutsShape;
    if (!props.addEndListener) pt = pt.isRequired;

for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
      args[_key - 1] = arguments[_key];
    }

return pt.apply(void 0, [props].concat(args));
  },

/**
   * Add a custom transition end trigger. Called with the transitioning
   * DOM node and a `done` callback. Allows for more fine grained transition end
   * logic. Timeouts are still used as a fallback if provided.
   *
   * **Note**: when `nodeRef` prop is passed, `node` is not passed.
   *
   * ```jsx
   * addEndListener={(node, done) => {
   *   // use the css transitionend event to mark the finish of a transition
   *   node.addEventListener('transitionend', done, false);
   * }}
   * ```
   */
  addEndListener: PropTypes.func,

/**
   * Callback fired before the "entering" status is applied. An extra parameter
   * `isAppearing` is supplied to indicate if the enter stage is occurring on the initial mount
   *
   * **Note**: when `nodeRef` prop is passed, `node` is not passed.
   *
   * @type Function(node: HtmlElement, isAppearing: bool) -> void
   */
  onEnter: PropTypes.func,

/**
   * Callback fired after the "entering" status is applied. An extra parameter
   * `isAppearing` is supplied to indicate if the enter stage is occurring on the initial mount
   *
   * **Note**: when `nodeRef` prop is passed, `node` is not passed.
   *
   * @type Function(node: HtmlElement, isAppearing: bool)
   */
  onEntering: PropTypes.func,

/**
   * Callback fired after the "entered" status is applied. An extra parameter
   * `isAppearing` is supplied to indicate if the enter stage is occurring on the initial mount
   *
   * **Note**: when `nodeRef` prop is passed, `node` is not passed.
   *
   * @type Function(node: HtmlElement, isAppearing: bool) -> void
   */
  onEntered: PropTypes.func,

/**
   * Callback fired before the "exiting" status is applied.
   *
   * **Note**: when `nodeRef` prop is passed, `node` is not passed.
   *
   * @type Function(node: HtmlElement) -> void
   */
  onExit: PropTypes.func,

/**
   * Callback fired after the "exiting" status is applied.
   *
   * **Note**: when `nodeRef` prop is passed, `node` is not passed.
   *
   * @type Function(node: HtmlElement) -> void
   */
  onExiting: PropTypes.func,

/**
   * Callback fired after the "exited" status is applied.
   *
   * **Note**: when `nodeRef` prop is passed, `node` is not passed
   *
   * @type Function(node: HtmlElement) -> void
   */
  onExited: PropTypes.func
} : {}; // Name the function so it is clearer in the documentation

function noop() {}

Transition.defaultProps = {
  in: false,
  mountOnEnter: false,
  unmountOnExit: false,
  appear: false,
  enter: true,
  exit: true,
  onEnter: noop,
  onEntering: noop,
  onEntered: noop,
  onExit: noop,
  onExiting: noop,
  onExited: noop
};
Transition.UNMOUNTED = UNMOUNTED;
Transition.EXITED = EXITED;
Transition.ENTERING = ENTERING;
Transition.ENTERED = ENTERED;
Transition.EXITING = EXITING;
export default Transition;

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