createNavigationContainer.js
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import React from 'react';
import { BackHandler, Linking } from './PlatformHelpers';
import NavigationActions from './NavigationActions';
import addNavigationHelpers from './addNavigationHelpers';
import invariant from './utils/invariant';
/**
* Create an HOC that injects the navigation and manages the navigation state
* in case it's not passed from above.
* This allows to use e.g. the StackNavigator and TabNavigator as root-level
* components.
*/
export default function createNavigationContainer(
// Let the NavigationNavigator props flowwwww
Component) {
class NavigationContainer extends React.Component {
subs = null;
static router = Component.router;
static navigationOptions = null;
constructor(props) {
super(props);
this._validateProps(props);
this.state = {
nav: this._isStateful() ? Component.router.getStateForAction(NavigationActions.init()) : null
};
}
_isStateful() {
return !this.props.navigation;
}
_validateProps(props) {
if (this._isStateful()) {
return;
}
const { navigation, screenProps, ...containerProps } = props;
const keys = Object.keys(containerProps);
if (keys.length !== 0) {
throw new Error('This navigator has both navigation and container props, so it is ' + `unclear if it should own its own state. Remove props: "${keys.join(', ')}" ` + 'if the navigator should get its state from the navigation prop. If the ' + 'navigator should maintain its own state, do not pass a navigation prop.');
}
}
_urlToPathAndParams(url) {
const params = {};
const delimiter = this.props.uriPrefix || '://';
let path = url.split(delimiter)[1];
if (typeof path === 'undefined') {
path = url;
}
return {
path,
params
};
}
_handleOpenURL = ({ url }) => {
const parsedUrl = this._urlToPathAndParams(url);
if (parsedUrl) {
const { path, params } = parsedUrl;
const action = Component.router.getActionForPathAndParams(path, params);
if (action) {
this.dispatch(action);
}
}
};
_onNavigationStateChange(prevNav, nav, action) {
if (typeof this.props.onNavigationStateChange === 'undefined' && this._isStateful() && !!process.env.REACT_NAV_LOGGING) {
/* eslint-disable no-console */
if (console.group) {
console.group('Navigation Dispatch: ');
console.log('Action: ', action);
console.log('New State: ', nav);
console.log('Last State: ', prevNav);
console.groupEnd();
} else {
console.log('Navigation Dispatch: ', {
action,
newState: nav,
lastState: prevNav
});
}
/* eslint-enable no-console */
return;
}
if (typeof this.props.onNavigationStateChange === 'function') {
this.props.onNavigationStateChange(prevNav, nav, action);
}
}
componentWillReceiveProps(nextProps) {
this._validateProps(nextProps);
}
componentDidUpdate() {
// Clear cached _nav every tick
if (this._nav === this.state.nav) {
this._nav = null;
}
}
componentDidMount() {
if (!this._isStateful()) {
return;
}
this.subs = BackHandler.addEventListener('hardwareBackPress', () => this.dispatch(NavigationActions.back()));
Linking.addEventListener('url', this._handleOpenURL);
Linking.getInitialURL().then(url => url && this._handleOpenURL({ url }));
}
componentWillUnmount() {
Linking.removeEventListener('url', this._handleOpenURL);
this.subs && this.subs.remove();
}
// Per-tick temporary storage for state.nav
dispatch = inputAction => {
const action = NavigationActions.mapDeprecatedActionAndWarn(inputAction);
if (!this._isStateful()) {
return false;
}
this._nav = this._nav || this.state.nav;
const oldNav = this._nav;
invariant(oldNav, 'should be set in constructor if stateful');
const nav = Component.router.getStateForAction(action, oldNav);
if (nav && nav !== oldNav) {
// Cache updates to state.nav during the tick to ensure that subsequent calls will not discard this change
this._nav = nav;
this.setState({ nav }, () => this._onNavigationStateChange(oldNav, nav, action));
return true;
}
return false;
};
render() {
let navigation = this.props.navigation;
if (this._isStateful()) {
const nav = this.state.nav;
invariant(nav, 'should be set in constructor if stateful');
if (!this._navigation || this._navigation.state !== nav) {
this._navigation = addNavigationHelpers({
dispatch: this.dispatch,
state: nav
});
}
navigation = this._navigation;
}
invariant(navigation, 'failed to get navigation');
return <Component {...this.props} navigation={navigation} />;
}
}
return NavigationContainer;
}