I am implementing animated header with ScrollView on screen. on scrollView onScroll I am also setting myview on base of scrollview Y position. Like this
const onScroll = ({ nativeEvent: { contentOffset: { y, x } } }) => {
let _currentSection;
// loop sections to calculate which section scrollview is on
state.sections.forEach((section, index) => {
// adding 15 to calculate Text's height
const moveToPOsition = wp('24') * 5.8 * index
console.log((y), state[section], index, moveToPOsition)
if ((y + 15) > moveToPOsition) _currentSection = index
})
// settint the currentSection to the calculated current section
setState((currentState) => ({ ...currentState, currentSection: _currentSection }))
}
Now on implementing animated header I need to add animation code onScroll. This one
const handleScroll = Animated.event(
[
{
nativeEvent: {
contentOffset: { y: scrollY.current },
},
},
],
{
useNativeDriver: true,
},
);
When I add both codes togather and called onScoll of scrollview they does not work ... while separately they work.
const onScroll = ({ nativeEvent: { contentOffset: { y, x } } }) => {
let _currentSection;
// loop sections to calculate which section scrollview is on
state.sections.forEach((section, index) => {
// adding 15 to calculate Text's height
const moveToPOsition = wp('24') * 5.8 * index
console.log((y), state[section], index, moveToPOsition)
if ((y + 15) > moveToPOsition) _currentSection = index
})
// settint the currentSection to the calculated current section
setState((currentState) => ({ ...currentState, currentSection: _currentSection }))
Animated.event(
[
{
nativeEvent: {
contentOffset: { y: scrollY.current },
},
},
],
{
useNativeDriver: true,
},
)
}
Calling onScoll like this
<Animated.ScrollView
style={styles.scrollView}
ref={scrollView}
contentContainerStyle={{paddingTop: headerHeight}}
scrollEventThrottle={100}
bounces={false}
onScroll={onScroll}>
{state.sections.map(section => (
<Item key={section.id} category={section}
onItemLayout={onItemLayout} data={data} />
))}
</Animated.ScrollView>
I found a solution
const onScroll = ({ nativeEvent: { contentOffset: { y, x } } }) => {
let _currentSection;
// loop sections to calculate which section scrollview is on
state.sections.forEach((section, index) => {
// adding 15 to calculate Text's height
const moveToPosition = wp('24') * 5.8 * index
// console.log((y), state[section], index, moveToPOsition)
if ((y + 15) > moveToPosition) _currentSection = index
})
const moveTabToPosition = ((Screen.width) / 5) * _currentSection
tabScrollView.current?.scrollTo({ x: moveTabToPosition, y: 0, animated: true });
if (state.currentSection != _currentSection) {
// settint the currentSection to the calculated current section
setState((currentState) => ({ ...currentState, currentSection: _currentSection }))
}
}
and add it in Animated.Event link this
const handleScroll = Animated.event(
[
{
nativeEvent: {
contentOffset: { y: scrollY.current },
},
},
],
{
useNativeDriver: true,
listener: event => {
onScroll(event);
},
},
);