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Merge pull request #27 from levibuzolic/memoize-styles
RFC: Memoize style objects to prevent re-renders of memoized components
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,54 @@ | ||
import React from 'react' | ||
import { Text, View, type StyleProp, type TextStyle, Button } from 'react-native' | ||
import { createStyleSheet, useStyles } from '../styles' | ||
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export const Memoization: React.FunctionComponent = () => { | ||
const { styles } = useStyles(stylesheet) | ||
const [ count, setCount ] = React.useState(0) | ||
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return ( | ||
<View style={styles.container}> | ||
<Memoized text="With breakpoints" style={styles.withBreakpoints} /> | ||
<Memoized text="No breakpoints" style={styles.noBreakpoints} /> | ||
<Memoized text="Static" style={staticStyles.static} /> | ||
<Button title={`Re-render (${count})`} onPress={() => setCount(count => count + 1)} /> | ||
</View> | ||
) | ||
} | ||
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const Memoized = React.memo<{text: string; style: StyleProp<TextStyle>}>(({ text, style }) => | ||
<Text style={style}>{text} ({useRenderCount()})</Text> | ||
) | ||
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const useRenderCount = () => { | ||
const count = React.useRef(0) | ||
count.current++ | ||
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return count.current | ||
} | ||
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const stylesheet = createStyleSheet({ | ||
container: { | ||
flex: 1, | ||
justifyContent: 'center', | ||
alignItems: 'center', | ||
alignContent: 'space-between', | ||
resizeMode: 'contain' | ||
}, | ||
withBreakpoints: { | ||
fontSize: 18, | ||
color: { | ||
xs: 'red', | ||
md: 'blue' | ||
} | ||
}, | ||
noBreakpoints: { | ||
fontSize: 18 | ||
} | ||
}) | ||
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const staticStyles = createStyleSheet({ | ||
static: { | ||
fontSize: 18 | ||
} | ||
}) |
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Original file line number | Diff line number | Diff line change |
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@@ -1,11 +1,4 @@ | ||
import { useWindowDimensions } from 'react-native' | ||
import type { ScreenSize } from '../types' | ||
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export const useDimensions = (): ScreenSize => { | ||
const { width, height } = useWindowDimensions() | ||
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return { | ||
width, | ||
height | ||
} | ||
} | ||
export const useDimensions = (): ScreenSize => useWindowDimensions() |