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Transitioner.js
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Transitioner.js
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import React from "react";
import { StyleSheet } from "react-native";
import Animated from "react-native-reanimated";
import {
createNavigator,
StackRouter,
NavigationProvider,
} from "react-navigation";
export const TransitionContext = React.createContext(null);
const interleaveArrays = (a, b) => {
let aIndex = 0;
let bIndex = 0;
let out = [];
const ensureItem = item => {
if (item && out.indexOf(item) === -1) {
out.push(item);
}
};
while (aIndex <= a.length - 1 || aIndex <= b.length - 1) {
ensureItem(a[aIndex]);
aIndex += 1;
ensureItem(b[bIndex]);
bIndex += 1;
}
return out;
};
const getTransitionOwnerRouteKey = (fromState, toState) => {
let transitionKey = fromState.routes[fromState.index].key;
if (toState && toState.index >= fromState.index) {
transitionKey = toState.routes[toState.index].key;
}
return transitionKey;
};
const defaultCreateTransition = transition => {
return { ...transition };
};
const defaultRunTransition = () => {};
const getStateForNavChange = (props, state) => {
// by this point we know the nav state has changed and it is safe to provide a new state. static
// getDerivedStateFromProps will never interrupt a transition (when there is state.transitionRouteKey),
// and _runTransition runs this after the previous transition is complete.
const { navigation } = props;
const nextNavState = navigation.state;
// Transitions are requested by setting nav state.isTransitioning to true.
// If false, we set the state immediately without transition
if (!nextNavState.isTransitioning) {
return {
transitions: state.transitions,
transitionRouteKey: null,
transitioningFromState: null,
transitioningFromDescriptors: null,
navState: nextNavState,
descriptors: props.descriptors,
};
}
const transitionRouteKey = getTransitionOwnerRouteKey(
state.navState,
nextNavState,
);
const descriptor =
props.descriptors[transitionRouteKey] ||
state.descriptors[transitionRouteKey] ||
state.transitioningFromDescriptors[transitionRouteKey];
const { options } = descriptor;
const createTransition = options.createTransition || defaultCreateTransition;
const transition =
state.transitions[transitionRouteKey] ||
createTransition({
navigation: props.navigation,
transitionRouteKey,
});
return {
transitions: {
...state.transitions,
[transitionRouteKey]: transition,
},
transitionRouteKey,
transitioningFromState: state.navState,
transitioningFromDescriptors: state.descriptors,
navState: nextNavState,
descriptors: props.descriptors,
};
};
export class Transitioner extends React.Component {
state = {
// an object of transitions by route key
transitions: {},
// if this is present, there is a transition in progress:
transitionRouteKey: null,
// this will be the previous nav state and descriptors, when there is a transition in progress
transitioningFromState: null,
transitioningFromDescriptors: {},
// this is the current navigation state and descriptors:
navState: this.props.navigation.state,
descriptors: this.props.descriptors,
};
// never re-assign this!
_transitionRefs = {};
static getDerivedStateFromProps = (props, state) => {
// Transition only happens when nav state changes
if (props.navigation.state === state.navState) {
return state;
}
// Never interrupt a transition in progress.
if (state.transitionRouteKey) {
return state;
}
return getStateForNavChange(props, state);
};
async _startTransition() {
// Put state in function scope, so we are confident that we refer to the exact same state later for getStateForNavChange.
// Even though our state shouldn't change during the animation.
const { state } = this;
const {
transitions,
transitionRouteKey,
transitioningFromState,
transitioningFromDescriptors,
navState,
descriptors,
} = state;
const descriptor =
descriptors[transitionRouteKey] ||
transitioningFromDescriptors[transitionRouteKey];
const { runTransition } = descriptor.options;
const run = runTransition || defaultRunTransition;
const transition = transitions[transitionRouteKey];
// Run animation, this might take some time..
await run(
transition,
this._transitionRefs,
transitioningFromState,
navState,
);
// after async animator, this.props may have changed. re-check it now:
if (navState === this.props.navigation.state) {
// Navigation state is currently the exact state we were transitioning to. Set final state and we're done
this.setState({
transitionRouteKey: null,
transitioningFromState: null,
transitioningFromDescriptors: {},
// navState and descriptors remain unchanged at this point.
});
// Also de-reference old screenRefs by replacing this._transitionRefs
const toKeySet = new Set(navState.routes.map(r => r.key));
navState.routes.forEach(r => {
if (!toKeySet.has(r.key)) {
delete this._transitionRefs[r.key];
}
});
} else {
// Navigation state prop has changed during the transtion! Schedule another transition
this.setState(getStateForNavChange(this.props, state));
}
}
componentDidUpdate(lastProps, lastState) {
if (
// If we are transitioning
this.state.transitionRouteKey &&
// And this is a new transition,
lastState.transitioningFromState !== this.state.transitioningFromState
) {
this._startTransition().then(
() => {},
e => {
console.error("Error running transition:", e);
},
);
}
}
_transitionContext = {
getTransition: transitionRouteKey => {
const { navState, transitionFromState, transitions } = this.state;
const defaultTransitionKey = getTransitionOwnerRouteKey(
navState,
transitionFromState,
);
const key = transitionRouteKey || defaultTransitionKey;
return transitions[key];
},
};
render() {
const {
transitions,
transitionRouteKey,
transitioningFromState,
transitioningFromDescriptors,
navState,
descriptors,
} = this.state;
const mainRouteKeys = navState.routes.map(r => r.key);
let routeKeys = mainRouteKeys;
if (transitionRouteKey) {
if (transitioningFromState) {
const prevRouteKeys = transitioningFromState.routes.map(r => r.key);
// While transitioning, our main nav state is navState. But we also need to render screens from the last state, preserving the order
routeKeys = interleaveArrays(prevRouteKeys, mainRouteKeys);
}
}
return (
<TransitionContext.Provider value={this._transitionContext}>
{routeKeys.map((key, index) => {
const ref =
this._transitionRefs[key] ||
(this._transitionRefs[key] = React.createRef());
const descriptor =
descriptors[key] || transitioningFromDescriptors[key];
const C = descriptor.getComponent();
const backScreenStyles = {}; // FIX THIS:
// const backScreenRouteKeys = routeKeys.slice(index + 1);
// const backScreenStyles = backScreenRouteKeys.map(
// backScreenRouteKey => {
// const backScreenDescriptor =
// toDescriptors[backScreenRouteKey] ||
// this.state.descriptors[backScreenRouteKey];
// const { options } = backScreenDescriptor;
// if (!transition || !options.getBehindTransitionAnimatedStyle) {
// return {};
// }
// return options.getBehindTransitionAnimatedStyle(transition);
// },
// );
let transition = transitions[key];
return (
<Animated.View
style={[{ ...StyleSheet.absoluteFillObject }, backScreenStyles]}
pointerEvents={"auto"}
key={key}
>
<NavigationProvider value={descriptor.navigation}>
<C
transition={transition}
transitions={transitions}
transitioningFromState={transitioningFromState}
transitioningToState={
transitionRouteKey ? this.props.navigation.state : null
}
transitionRouteKey={transitionRouteKey}
navigation={descriptor.navigation}
transitionRef={ref}
/>
</NavigationProvider>
</Animated.View>
);
})}
</TransitionContext.Provider>
);
}
}
const createTransitionNavigator = (routeConfig, opts) => {
const router = StackRouter(routeConfig, opts);
const Nav = createNavigator(Transitioner, router);
return Nav;
};
export default createTransitionNavigator;