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Rendering many tiles without startTransition
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import * as React from 'react'; | |
import {SafeAreaView, Text, View, ActivityIndicator} from 'react-native'; | |
import Slider from '@react-native-community/slider'; | |
function SliderHeader({ | |
value, | |
onValueChange, | |
}: { | |
value: number; | |
onValueChange: (value: number) => void; | |
}) { | |
const [isPending, startTransition] = React.useTransition(); | |
return ( | |
<> | |
<View | |
style={{ | |
flexDirection: 'row', | |
justifyContent: 'space-between', | |
paddingHorizontal: 8, | |
}}> | |
<Text style={{textAlign: 'center'}}> | |
Render <Text style={{fontWeight: '500'}}>{value}</Text> Tiles{' '} | |
</Text> | |
<ActivityIndicator animating={isPending} /> | |
</View> | |
<Slider | |
value={1} | |
minimumValue={1} | |
maximumValue={1000} | |
step={1} | |
onValueChange={newValue => { | |
// Do not mark this update as a transition | |
onValueChange(newValue); | |
}} | |
/> | |
</> | |
); | |
} | |
export default function ManyTiles() { | |
const views = []; | |
const size = 14; | |
const [value, setValue] = React.useState(1); | |
for (let i = 0; i < value; ++i) { | |
const view = ( | |
<View | |
key={i} | |
style={{ | |
width: size, | |
height: size, | |
borderWidth: 0.5, | |
backgroundColor: 'red', | |
}} | |
/> | |
); | |
views.push(view); | |
} | |
return ( | |
<SafeAreaView style={{backgroundColor: 'white'}}> | |
<SliderHeader onValueChange={setValue} value={value} /> | |
<View | |
style={{ | |
flexDirection: 'row', | |
flex: 1, | |
flexWrap: 'wrap', | |
}}> | |
{views} | |
</View> | |
</SafeAreaView> | |
); | |
} |
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