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Refactor ScrollView example to trigger onScrollToTop #42127

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Refactor ScrollView example to trigger onScrollToTop #42127

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97 changes: 54 additions & 43 deletions packages/rn-tester/js/examples/ScrollView/ScrollViewExample.js
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Original file line number Diff line number Diff line change
Expand Up @@ -193,6 +193,59 @@ function ContentOffsetList(): React.Node {
);
}

function ScrollViewScrollToExample(): React.Node {
let _scrollView: ?React.ElementRef<typeof ScrollView>;
const [scrolledToTop, setScrolledToTop] = useState(false);
const textStyle = {color: 'blue', marginBottom: 10, textAlign: 'center'};
return (
<View>
{scrolledToTop ? (
<Text style={textStyle}>scrolledToTop invoked</Text>
) : null}
<ScrollView
accessibilityRole="grid"
ref={scrollView => {
_scrollView = scrollView;
}}
automaticallyAdjustContentInsets={false}
nestedScrollEnabled
onScroll={() => {
console.log('onScroll!');
setScrolledToTop(false);
}}
onScrollToTop={() => {
setScrolledToTop(true);
}}
scrollEventThrottle={200}
style={styles.scrollView}
testID="scroll_vertical">
{ITEMS.map(createItemRow)}
</ScrollView>
<Button
label="Scroll to top"
onPress={() => {
nullthrows<$FlowFixMe>(_scrollView).scrollTo({y: 0});
}}
testID="scroll_to_top_button"
/>
<Button
label="Scroll to bottom"
onPress={() => {
nullthrows<$FlowFixMe>(_scrollView).scrollToEnd({animated: true});
}}
testID="scroll_to_bottom_button"
/>
<Button
label="Flash scroll indicators"
onPress={() => {
nullthrows<$FlowFixMe>(_scrollView).flashScrollIndicators();
}}
testID="flash_scroll_indicators_button"
/>
</View>
);
}

exports.displayName = 'ScrollViewExample';
exports.title = 'ScrollView';
exports.documentationURL = 'https://reactnative.dev/docs/scrollview';
Expand All @@ -205,49 +258,7 @@ const examples = ([
title: '<ScrollView>\n',
description:
'To make content scrollable, wrap it within a <ScrollView> component',
render: function (): React.Node {
let _scrollView: ?React.ElementRef<typeof ScrollView>;
return (
<View>
<ScrollView
accessibilityRole="grid"
ref={scrollView => {
_scrollView = scrollView;
}}
automaticallyAdjustContentInsets={false}
nestedScrollEnabled
onScroll={() => {
console.log('onScroll!');
}}
scrollEventThrottle={200}
style={styles.scrollView}
testID="scroll_vertical">
{ITEMS.map(createItemRow)}
</ScrollView>
<Button
label="Scroll to top"
onPress={() => {
nullthrows<$FlowFixMe>(_scrollView).scrollTo({y: 0});
}}
testID="scroll_to_top_button"
/>
<Button
label="Scroll to bottom"
onPress={() => {
nullthrows<$FlowFixMe>(_scrollView).scrollToEnd({animated: true});
}}
testID="scroll_to_bottom_button"
/>
<Button
label="Flash scroll indicators"
onPress={() => {
nullthrows<$FlowFixMe>(_scrollView).flashScrollIndicators();
}}
testID="flash_scroll_indicators_button"
/>
</View>
);
},
render: ScrollViewScrollToExample,
},
{
name: 'horizontalScrollTo',
Expand Down