react-native-tab-view-next/lib/commonjs/SceneView.js

Tab view component for React Native

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

var React = _interopRequireWildcard(require("react"));

var _reactNative = require("react-native");

function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function (nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }

function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }

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; }

class SceneView extends React.Component {
  constructor() {
    super(...arguments);

    _defineProperty(this, "state", {
      loading: Math.abs(this.props.navigationState.index - this.props.index) > this.props.lazyPreloadDistance
    });

    _defineProperty(this, "timerHandler", void 0);

    _defineProperty(this, "unsubscribe", null);

    _defineProperty(this, "handleEnter", value => {
      const {
        index
      } = this.props; // If we're entering the current route, we need to load it

      if (value === index) {
        this.setState(prevState => {
          if (prevState.loading) {
            return {
              loading: false
            };
          }

          return null;
        });
      }
    });
  }

  static getDerivedStateFromProps(props, state) {
    if (state.loading && Math.abs(props.navigationState.index - props.index) <= props.lazyPreloadDistance) {
      // Always render the route when it becomes focused
      return {
        loading: false
      };
    }

    return null;
  }

  componentDidMount() {
    if (this.props.lazy) {
      // If lazy mode is enabled, listen to when we enter screens
      this.unsubscribe = this.props.addEnterListener(this.handleEnter);
    } else if (this.state.loading) {
      // If lazy mode is not enabled, render the scene with a delay if not loaded already
      // This improves the initial startup time as the scene is no longer blocking
      this.timerHandler = setTimeout(() => this.setState({
        loading: false
      }), 0);
    }
  }

  componentDidUpdate(prevProps, prevState) {
    if (this.props.lazy !== prevProps.lazy || this.state.loading !== prevState.loading) {
      // We only need the listener if the tab hasn't loaded yet and lazy is enabled
      if (this.props.lazy && this.state.loading) {
        var _this$unsubscribe;

        (_this$unsubscribe = this.unsubscribe) === null || _this$unsubscribe === void 0 ? void 0 : _this$unsubscribe.call(this);
        this.unsubscribe = this.props.addEnterListener(this.handleEnter);
      } else {
        var _this$unsubscribe2;

        (_this$unsubscribe2 = this.unsubscribe) === null || _this$unsubscribe2 === void 0 ? void 0 : _this$unsubscribe2.call(this);
      }
    }
  }

  componentWillUnmount() {
    var _this$unsubscribe3;

    (_this$unsubscribe3 = this.unsubscribe) === null || _this$unsubscribe3 === void 0 ? void 0 : _this$unsubscribe3.call(this);

    if (this.timerHandler) {
      clearTimeout(this.timerHandler);
      this.timerHandler = undefined;
    }
  }

  render() {
    const {
      navigationState,
      index,
      layout,
      style
    } = this.props;
    const {
      loading
    } = this.state;
    const focused = navigationState.index === index;
    return /*#__PURE__*/React.createElement(_reactNative.View, {
      accessibilityElementsHidden: !focused,
      importantForAccessibility: focused ? 'auto' : 'no-hide-descendants',
      style: [styles.route, // If we don't have the layout yet, make the focused screen fill the container
      // This avoids delay before we are able to render pages side by side
      layout.width ? {
        width: layout.width
      } : focused ? _reactNative.StyleSheet.absoluteFill : null, style]
    }, // Only render the route only if it's either focused or layout is available
    // When layout is not available, we must not render unfocused routes
    // so that the focused route can fill the screen
    focused || layout.width ? this.props.children({
      loading
    }) : null);
  }

}

exports.default = SceneView;

const styles = _reactNative.StyleSheet.create({
  route: {
    flex: 1,
    overflow: 'hidden'
  }
});
//# sourceMappingURL=SceneView.js.map