81 lines
3.1 KiB
JavaScript
81 lines
3.1 KiB
JavaScript
|
import * as React from 'react';
|
||
|
|
import { useNavigation, useRoute } from '@react-navigation/core';
|
||
|
|
|
||
|
|
function getScrollableNode(ref) {
|
||
|
|
if (ref.current == null) {
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ('scrollToTop' in ref.current || 'scrollTo' in ref.current || 'scrollToOffset' in ref.current || 'scrollResponderScrollTo' in ref.current) {
|
||
|
|
// This is already a scrollable node.
|
||
|
|
return ref.current;
|
||
|
|
} else if ('getScrollResponder' in ref.current) {
|
||
|
|
// If the view is a wrapper like FlatList, SectionList etc.
|
||
|
|
// We need to use `getScrollResponder` to get access to the scroll responder
|
||
|
|
return ref.current.getScrollResponder();
|
||
|
|
} else if ('getNode' in ref.current) {
|
||
|
|
// When a `ScrollView` is wraped in `Animated.createAnimatedComponent`
|
||
|
|
// we need to use `getNode` to get the ref to the actual scrollview.
|
||
|
|
// Note that `getNode` is deprecated in newer versions of react-native
|
||
|
|
// this is why we check if we already have a scrollable node above.
|
||
|
|
return ref.current.getNode();
|
||
|
|
} else {
|
||
|
|
return ref.current;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
export default function useScrollToTop(ref) {
|
||
|
|
const navigation = useNavigation();
|
||
|
|
const route = useRoute();
|
||
|
|
React.useEffect(() => {
|
||
|
|
let current = navigation; // The screen might be inside another navigator such as stack nested in tabs
|
||
|
|
// We need to find the closest tab navigator and add the listener there
|
||
|
|
|
||
|
|
while (current && current.dangerouslyGetState().type !== 'tab') {
|
||
|
|
current = current.dangerouslyGetParent();
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!current) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
const unsubscribe = current.addListener( // We don't wanna import tab types here to avoid extra deps
|
||
|
|
// in addition, there are multiple tab implementations
|
||
|
|
// @ts-expect-error
|
||
|
|
'tabPress', e => {
|
||
|
|
// We should scroll to top only when the screen is focused
|
||
|
|
const isFocused = navigation.isFocused(); // In a nested stack navigator, tab press resets the stack to first screen
|
||
|
|
// So we should scroll to top only when we are on first screen
|
||
|
|
|
||
|
|
const isFirst = navigation === current || navigation.dangerouslyGetState().routes[0].key === route.key; // Run the operation in the next frame so we're sure all listeners have been run
|
||
|
|
// This is necessary to know if preventDefault() has been called
|
||
|
|
|
||
|
|
requestAnimationFrame(() => {
|
||
|
|
const scrollable = getScrollableNode(ref);
|
||
|
|
|
||
|
|
if (isFocused && isFirst && scrollable && !e.defaultPrevented) {
|
||
|
|
if ('scrollToTop' in scrollable) {
|
||
|
|
scrollable.scrollToTop();
|
||
|
|
} else if ('scrollTo' in scrollable) {
|
||
|
|
scrollable.scrollTo({
|
||
|
|
y: 0,
|
||
|
|
animated: true
|
||
|
|
});
|
||
|
|
} else if ('scrollToOffset' in scrollable) {
|
||
|
|
scrollable.scrollToOffset({
|
||
|
|
offset: 0,
|
||
|
|
animated: true
|
||
|
|
});
|
||
|
|
} else if ('scrollResponderScrollTo' in scrollable) {
|
||
|
|
scrollable.scrollResponderScrollTo({
|
||
|
|
y: 0,
|
||
|
|
animated: true
|
||
|
|
});
|
||
|
|
}
|
||
|
|
}
|
||
|
|
});
|
||
|
|
});
|
||
|
|
return unsubscribe;
|
||
|
|
}, [navigation, ref, route.key]);
|
||
|
|
}
|
||
|
|
//# sourceMappingURL=useScrollToTop.js.map
|