react-native-tab-view/lib/module/TabView.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); }

import * as React from 'react';
import { StyleSheet, View } from 'react-native';
import TabBar from './TabBar';
import SceneView from './SceneView';
import Pager from './Pager';
export default function TabView({
  onIndexChange,
  navigationState,
  renderScene,
  initialLayout,
  keyboardDismissMode = 'auto',
  lazy = false,
  lazyPreloadDistance = 0,
  onSwipeStart,
  onSwipeEnd,
  renderLazyPlaceholder = () => null,
  renderTabBar = props => /*#__PURE__*/React.createElement(TabBar, props),
  sceneContainerStyle,
  style,
  swipeEnabled = true,
  tabBarPosition = 'top'
}) {
  const [layout, setLayout] = React.useState({
    width: 0,
    height: 0,
    ...initialLayout
  });

  const jumpToIndex = index => {
    if (index !== navigationState.index) {
      onIndexChange(index);
    }
  };

  const handleLayout = e => {
    const {
      height,
      width
    } = e.nativeEvent.layout;
    setLayout(prevLayout => {
      if (prevLayout.width === width && prevLayout.height === height) {
        return prevLayout;
      }

      return {
        height,
        width
      };
    });
  };

  return /*#__PURE__*/React.createElement(View, {
    onLayout: handleLayout,
    style: [styles.pager, style]
  }, /*#__PURE__*/React.createElement(Pager, {
    layout: layout,
    navigationState: navigationState,
    keyboardDismissMode: keyboardDismissMode,
    swipeEnabled: swipeEnabled,
    onSwipeStart: onSwipeStart,
    onSwipeEnd: onSwipeEnd,
    onIndexChange: jumpToIndex
  }, ({
    position,
    render,
    addEnterListener,
    jumpTo
  }) => {
    // All of the props here must not change between re-renders
    // This is crucial to optimizing the routes with PureComponent
    const sceneRendererProps = {
      position,
      layout,
      jumpTo
    };
    return /*#__PURE__*/React.createElement(React.Fragment, null, tabBarPosition === 'top' && renderTabBar({ ...sceneRendererProps,
      navigationState
    }), render(navigationState.routes.map((route, i) => {
      return /*#__PURE__*/React.createElement(SceneView, _extends({}, sceneRendererProps, {
        addEnterListener: addEnterListener,
        key: route.key,
        index: i,
        lazy: typeof lazy === 'function' ? lazy({
          route
        }) : lazy,
        lazyPreloadDistance: lazyPreloadDistance,
        navigationState: navigationState,
        style: sceneContainerStyle
      }), ({
        loading
      }) => loading ? renderLazyPlaceholder({
        route
      }) : renderScene({ ...sceneRendererProps,
        route
      }));
    })), tabBarPosition === 'bottom' && renderTabBar({ ...sceneRendererProps,
      navigationState
    }));
  }));
}
const styles = StyleSheet.create({
  pager: {
    flex: 1,
    overflow: 'hidden'
  }
});
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