@react-navigation/stack/lib/module/views/Stack/StackView.js

function _extends() { _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; }; return _extends.apply(this, arguments); }

function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

import { HeaderShownContext, SafeAreaProviderCompat } from '@react-navigation/elements';
import { StackActions } from '@react-navigation/native';
import * as React from 'react';
import { StyleSheet, View } from 'react-native';
import { SafeAreaInsetsContext } from 'react-native-safe-area-context';
import ModalPresentationContext from '../../utils/ModalPresentationContext';
import { GestureHandlerRootView } from '../GestureHandler';
import HeaderContainer from '../Header/HeaderContainer';
import CardStack from './CardStack';
const GestureHandlerWrapper = GestureHandlerRootView !== null && GestureHandlerRootView !== void 0 ? GestureHandlerRootView : View;
/**
 * Compare two arrays with primitive values as the content.
 * We need to make sure that both values and order match.
 */

const isArrayEqual = (a, b) => a.length === b.length && a.every((it, index) => it === b[index]);

export default class StackView extends React.Component {
  constructor() {
    super(...arguments);

    _defineProperty(this, "state", {
      routes: [],
      previousRoutes: [],
      previousDescriptors: {},
      openingRouteKeys: [],
      closingRouteKeys: [],
      replacingRouteKeys: [],
      descriptors: {}
    });

    _defineProperty(this, "getPreviousRoute", _ref => {
      let {
        route
      } = _ref;
      const {
        closingRouteKeys,
        replacingRouteKeys
      } = this.state;
      const routes = this.state.routes.filter(r => r.key === route.key || !closingRouteKeys.includes(r.key) && !replacingRouteKeys.includes(r.key));
      const index = routes.findIndex(r => r.key === route.key);
      return routes[index - 1];
    });

    _defineProperty(this, "renderScene", _ref2 => {
      let {
        route
      } = _ref2;
      const descriptor = this.state.descriptors[route.key] || this.props.descriptors[route.key];

      if (!descriptor) {
        return null;
      }

      return descriptor.render();
    });

    _defineProperty(this, "renderHeader", props => {
      return /*#__PURE__*/React.createElement(HeaderContainer, props);
    });

    _defineProperty(this, "handleOpenRoute", _ref3 => {
      let {
        route
      } = _ref3;
      const {
        state,
        navigation
      } = this.props;
      const {
        closingRouteKeys,
        replacingRouteKeys
      } = this.state;

      if (closingRouteKeys.some(key => key === route.key) && replacingRouteKeys.every(key => key !== route.key) && state.routeNames.includes(route.name) && !state.routes.some(r => r.key === route.key)) {
        // If route isn't present in current state, but was closing, assume that a close animation was cancelled
        // So we need to add this route back to the state
        navigation.navigate(route);
      } else {
        this.setState(state => ({
          routes: state.replacingRouteKeys.length ? state.routes.filter(r => !state.replacingRouteKeys.includes(r.key)) : state.routes,
          openingRouteKeys: state.openingRouteKeys.filter(key => key !== route.key),
          closingRouteKeys: state.closingRouteKeys.filter(key => key !== route.key),
          replacingRouteKeys: []
        }));
      }
    });

    _defineProperty(this, "handleCloseRoute", _ref4 => {
      let {
        route
      } = _ref4;
      const {
        state,
        navigation
      } = this.props;

      if (state.routes.some(r => r.key === route.key)) {
        // If a route exists in state, trigger a pop
        // This will happen in when the route was closed from the card component
        // e.g. When the close animation triggered from a gesture ends
        navigation.dispatch({ ...StackActions.pop(),
          source: route.key,
          target: state.key
        });
      } else {
        // We need to clean up any state tracking the route and pop it immediately
        this.setState(state => ({
          routes: state.routes.filter(r => r.key !== route.key),
          openingRouteKeys: state.openingRouteKeys.filter(key => key !== route.key),
          closingRouteKeys: state.closingRouteKeys.filter(key => key !== route.key)
        }));
      }
    });

    _defineProperty(this, "handleTransitionStart", (_ref5, closing) => {
      let {
        route
      } = _ref5;
      return this.props.navigation.emit({
        type: 'transitionStart',
        data: {
          closing
        },
        target: route.key
      });
    });

    _defineProperty(this, "handleTransitionEnd", (_ref6, closing) => {
      let {
        route
      } = _ref6;
      return this.props.navigation.emit({
        type: 'transitionEnd',
        data: {
          closing
        },
        target: route.key
      });
    });

    _defineProperty(this, "handleGestureStart", _ref7 => {
      let {
        route
      } = _ref7;
      this.props.navigation.emit({
        type: 'gestureStart',
        target: route.key
      });
    });

    _defineProperty(this, "handleGestureEnd", _ref8 => {
      let {
        route
      } = _ref8;
      this.props.navigation.emit({
        type: 'gestureEnd',
        target: route.key
      });
    });

    _defineProperty(this, "handleGestureCancel", _ref9 => {
      let {
        route
      } = _ref9;
      this.props.navigation.emit({
        type: 'gestureCancel',
        target: route.key
      });
    });
  }

  static getDerivedStateFromProps(props, state) {
    // If there was no change in routes, we don't need to compute anything
    if ((props.state.routes === state.previousRoutes || isArrayEqual(props.state.routes.map(r => r.key), state.previousRoutes.map(r => r.key))) && state.routes.length) {
      let routes = state.routes;
      let previousRoutes = state.previousRoutes;
      let descriptors = props.descriptors;
      let previousDescriptors = state.previousDescriptors;

      if (props.descriptors !== state.previousDescriptors) {
        descriptors = state.routes.reduce((acc, route) => {
          acc[route.key] = props.descriptors[route.key] || state.descriptors[route.key];
          return acc;
        }, {});
        previousDescriptors = props.descriptors;
      }

      if (props.state.routes !== state.previousRoutes) {
        // if any route objects have changed, we should update them
        const map = props.state.routes.reduce((acc, route) => {
          acc[route.key] = route;
          return acc;
        }, {});
        routes = state.routes.map(route => map[route.key] || route);
        previousRoutes = props.state.routes;
      }

      return {
        routes,
        previousRoutes,
        descriptors,
        previousDescriptors
      };
    } // Here we determine which routes were added or removed to animate them
    // We keep a copy of the route being removed in local state to be able to animate it


    let routes = props.state.index < props.state.routes.length - 1 ? // Remove any extra routes from the state
    // The last visible route should be the focused route, i.e. at current index
    props.state.routes.slice(0, props.state.index + 1) : props.state.routes; // Now we need to determine which routes were added and removed

    let {
      openingRouteKeys,
      closingRouteKeys,
      replacingRouteKeys,
      previousRoutes
    } = state;
    const previousFocusedRoute = previousRoutes[previousRoutes.length - 1];
    const nextFocusedRoute = routes[routes.length - 1];

    const isAnimationEnabled = key => {
      const descriptor = props.descriptors[key] || state.descriptors[key];
      return descriptor ? descriptor.options.animationEnabled !== false : true;
    };

    const getAnimationTypeForReplace = key => {
      var _descriptor$options$a;

      const descriptor = props.descriptors[key] || state.descriptors[key];
      return (_descriptor$options$a = descriptor.options.animationTypeForReplace) !== null && _descriptor$options$a !== void 0 ? _descriptor$options$a : 'push';
    };

    if (previousFocusedRoute && previousFocusedRoute.key !== nextFocusedRoute.key) {
      // We only need to animate routes if the focused route changed
      // Animating previous routes won't be visible coz the focused route is on top of everything
      if (!previousRoutes.some(r => r.key === nextFocusedRoute.key)) {
        // A new route has come to the focus, we treat this as a push
        // A replace can also trigger this, the animation should look like push
        if (isAnimationEnabled(nextFocusedRoute.key) && !openingRouteKeys.includes(nextFocusedRoute.key)) {
          // In this case, we need to animate pushing the focused route
          // We don't care about animating any other added routes because they won't be visible
          openingRouteKeys = [...openingRouteKeys, nextFocusedRoute.key];
          closingRouteKeys = closingRouteKeys.filter(key => key !== nextFocusedRoute.key);
          replacingRouteKeys = replacingRouteKeys.filter(key => key !== nextFocusedRoute.key);

          if (!routes.some(r => r.key === previousFocusedRoute.key)) {
            // The previous focused route isn't present in state, we treat this as a replace
            openingRouteKeys = openingRouteKeys.filter(key => key !== previousFocusedRoute.key);

            if (getAnimationTypeForReplace(nextFocusedRoute.key) === 'pop') {
              closingRouteKeys = [...closingRouteKeys, previousFocusedRoute.key]; // By default, new routes have a push animation, so we add it to `openingRouteKeys` before
              // But since user configured it to animate the old screen like a pop, we need to add this without animation
              // So remove it from `openingRouteKeys` which will remove the animation

              openingRouteKeys = openingRouteKeys.filter(key => key !== nextFocusedRoute.key); // Keep the route being removed at the end to animate it out

              routes = [...routes, previousFocusedRoute];
            } else {
              replacingRouteKeys = [...replacingRouteKeys, previousFocusedRoute.key];
              closingRouteKeys = closingRouteKeys.filter(key => key !== previousFocusedRoute.key); // Keep the old route in the state because it's visible under the new route, and removing it will feel abrupt
              // We need to insert it just before the focused one (the route being pushed)
              // After the push animation is completed, routes being replaced will be removed completely

              routes = routes.slice();
              routes.splice(routes.length - 1, 0, previousFocusedRoute);
            }
          }
        }
      } else if (!routes.some(r => r.key === previousFocusedRoute.key)) {
        // The previously focused route was removed, we treat this as a pop
        if (isAnimationEnabled(previousFocusedRoute.key) && !closingRouteKeys.includes(previousFocusedRoute.key)) {
          closingRouteKeys = [...closingRouteKeys, previousFocusedRoute.key]; // Sometimes a route can be closed before the opening animation finishes
          // So we also need to remove it from the opening list

          openingRouteKeys = openingRouteKeys.filter(key => key !== previousFocusedRoute.key);
          replacingRouteKeys = replacingRouteKeys.filter(key => key !== previousFocusedRoute.key); // Keep a copy of route being removed in the state to be able to animate it

          routes = [...routes, previousFocusedRoute];
        }
      } else {// Looks like some routes were re-arranged and no focused routes were added/removed
        // i.e. the currently focused route already existed and the previously focused route still exists
        // We don't know how to animate this
      }
    } else if (replacingRouteKeys.length || closingRouteKeys.length) {
      // Keep the routes we are closing or replacing if animation is enabled for them
      routes = routes.slice();
      routes.splice(routes.length - 1, 0, ...state.routes.filter(_ref10 => {
        let {
          key
        } = _ref10;
        return isAnimationEnabled(key) ? replacingRouteKeys.includes(key) || closingRouteKeys.includes(key) : false;
      }));
    }

    if (!routes.length) {
      throw new Error('There should always be at least one route in the navigation state.');
    }

    const descriptors = routes.reduce((acc, route) => {
      acc[route.key] = props.descriptors[route.key] || state.descriptors[route.key];
      return acc;
    }, {});
    return {
      routes,
      previousRoutes: props.state.routes,
      previousDescriptors: props.descriptors,
      openingRouteKeys,
      closingRouteKeys,
      replacingRouteKeys,
      descriptors
    };
  }

  render() {
    const {
      state,
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      descriptors: _,
      ...rest
    } = this.props;
    const {
      routes,
      descriptors,
      openingRouteKeys,
      closingRouteKeys
    } = this.state;
    return /*#__PURE__*/React.createElement(GestureHandlerWrapper, {
      style: styles.container
    }, /*#__PURE__*/React.createElement(SafeAreaProviderCompat, null, /*#__PURE__*/React.createElement(SafeAreaInsetsContext.Consumer, null, insets => /*#__PURE__*/React.createElement(ModalPresentationContext.Consumer, null, isParentModal => /*#__PURE__*/React.createElement(HeaderShownContext.Consumer, null, isParentHeaderShown => /*#__PURE__*/React.createElement(CardStack, _extends({
      insets: insets,
      isParentHeaderShown: isParentHeaderShown,
      isParentModal: isParentModal,
      getPreviousRoute: this.getPreviousRoute,
      routes: routes,
      openingRouteKeys: openingRouteKeys,
      closingRouteKeys: closingRouteKeys,
      onOpenRoute: this.handleOpenRoute,
      onCloseRoute: this.handleCloseRoute,
      onTransitionStart: this.handleTransitionStart,
      onTransitionEnd: this.handleTransitionEnd,
      renderHeader: this.renderHeader,
      renderScene: this.renderScene,
      state: state,
      descriptors: descriptors,
      onGestureStart: this.handleGestureStart,
      onGestureEnd: this.handleGestureEnd,
      onGestureCancel: this.handleGestureCancel
    }, rest)))))));
  }

}
const styles = StyleSheet.create({
  container: {
    flex: 1
  }
});
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