react-native-tab-view
Version:
Tab view component for React Native
79 lines (78 loc) • 3.72 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.SceneView = SceneView;
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 SceneView(_ref) {
let {
children,
navigationState,
lazy,
layout,
index,
lazyPreloadDistance,
addEnterListener,
style
} = _ref;
const [isLoading, setIsLoading] = React.useState(Math.abs(navigationState.index - index) > lazyPreloadDistance);
if (isLoading && Math.abs(navigationState.index - index) <= lazyPreloadDistance) {
// Always render the route when it becomes focused
setIsLoading(false);
}
React.useEffect(() => {
const handleEnter = value => {
// If we're entering the current route, we need to load it
if (value === index) {
setIsLoading(prevState => {
if (prevState) {
return false;
}
return prevState;
});
}
};
let unsubscribe;
let timer;
if (lazy && isLoading) {
// If lazy mode is enabled, listen to when we enter screens
unsubscribe = addEnterListener(handleEnter);
} else if (isLoading) {
// 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
timer = setTimeout(() => setIsLoading(false), 0);
}
return () => {
var _unsubscribe;
(_unsubscribe = unsubscribe) === null || _unsubscribe === void 0 ? void 0 : _unsubscribe();
clearTimeout(timer);
};
}, [addEnterListener, index, isLoading, lazy]);
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 ? children({
loading: isLoading
}) : null);
}
const styles = _reactNative.StyleSheet.create({
route: {
flex: 1,
overflow: 'hidden'
}
});
//# sourceMappingURL=SceneView.js.map