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feat(scrollview): add ScrollView component
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Artur Bien
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Dec 5, 2020
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,182 @@ | ||
| import React from 'react'; | ||
| import { | ||
| StyleSheet, | ||
| View, | ||
| ScrollView as RNScrollView, | ||
| ViewStyle, | ||
| ImageBackground, | ||
| Image, | ||
| } from 'react-native'; | ||
| import { original as theme } from '../common/themes'; | ||
|
|
||
| import { Panel, Button } from '..'; | ||
|
|
||
| type ScrollViewProps = React.ComponentProps<typeof RNScrollView> & { | ||
| style?: ViewStyle; | ||
| children: React.ReactNode; | ||
| }; | ||
|
|
||
| const scrollbarSize = 30; | ||
|
|
||
| const Icon = ( | ||
| <Image | ||
| // border to compensate for Border | ||
| style={[ | ||
| { | ||
| width: 18, | ||
| height: 18, | ||
| marginTop: 6, | ||
| }, | ||
| ]} | ||
| source={{ | ||
| uri: | ||
| 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAkAAAAJCAYAAADgkQYQAAAALElEQVQoU2NkIAIwEqGGgWRF/7GYCjYE3SRkhXA5bNaBFKKIk+wmnB4lyiQAAsgDCqkPxTcAAAAASUVORK5CYII=', | ||
| }} | ||
| /> | ||
| ); | ||
|
|
||
| const ScrollView = ({ children, style, ...rest }: ScrollViewProps) => { | ||
| const scrollView = React.useRef(null); | ||
| const [contentOffset, setContentOffset] = React.useState({ x: 0, y: 0 }); | ||
| const [contentSize, setContentSize] = React.useState(0); | ||
| const [scrollViewHeight, setScrollViewHeight] = React.useState(0); | ||
|
|
||
| const scrollElementHeightPercent = 100 * (scrollViewHeight / contentSize); | ||
|
|
||
| const scrollPerc = | ||
| (contentOffset.y / (contentSize - scrollViewHeight)) * | ||
| (100 - scrollElementHeightPercent); | ||
|
|
||
| const thumbPosition = Math.max( | ||
| 0, | ||
| Math.min(100 - scrollElementHeightPercent, Math.round(scrollPerc || 0)), | ||
| ); | ||
|
|
||
| const moveScroll = (direction: -1 | 1) => { | ||
| if (scrollView.current) { | ||
| scrollView.current.scrollTo({ y: contentOffset.y + 24 * direction }); | ||
| } | ||
| }; | ||
|
|
||
| return ( | ||
| <View style={[styles.wrapper, style]}> | ||
| <View style={[styles.content]}> | ||
| <RNScrollView | ||
| showsVerticalScrollIndicator={false} | ||
| scrollEventThrottle={10} | ||
| ref={scrollView} | ||
| onScroll={e => { | ||
| setContentOffset(e.nativeEvent.contentOffset); | ||
| }} | ||
| onContentSizeChange={(_, height) => { | ||
| setContentSize(height); | ||
| }} | ||
| onLayout={e => { | ||
| setScrollViewHeight(e.nativeEvent.layout.height); | ||
| }} | ||
| {...rest} | ||
| > | ||
| {children} | ||
| </RNScrollView> | ||
| </View> | ||
| {contentSize > scrollViewHeight && ( | ||
| <View style={[styles.scrollbarTrack]}> | ||
| <ImageBackground | ||
| style={[styles.background]} | ||
| imageStyle={{ | ||
| resizeMode: 'repeat', | ||
| }} | ||
| source={{ | ||
| // TODO: create util function for generating checkered background | ||
| uri: | ||
| 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAICAYAAADED76LAAAAIUlEQVQoU2P8////fwYkwMjIyIjCp4MCZPtAbAwraa8AAEGrH/nfAIhgAAAAAElFTkSuQmCC', | ||
| }} | ||
| /> | ||
| <Button | ||
| variant='outside' | ||
| onPress={() => moveScroll(-1)} | ||
| style={[styles.scrollbarButton]} | ||
| > | ||
| <View | ||
| style={{ | ||
| justifyContent: 'center', | ||
| alignItems: 'center', | ||
| // flex: 1, | ||
| transform: [{ translateY: 6 }, { rotate: '180deg' }], | ||
| }} | ||
| > | ||
| {Icon} | ||
| </View> | ||
| </Button> | ||
| <View style={[styles.scrollbar]}> | ||
| <Panel | ||
| variant='outside' | ||
| style={[ | ||
| styles.scrollbarBar, | ||
| { | ||
| position: 'absolute', | ||
| top: `${thumbPosition}%`, | ||
| height: `${scrollElementHeightPercent}%`, | ||
| }, | ||
| ]} | ||
| /> | ||
| </View> | ||
| <Button | ||
| variant='outside' | ||
| onPress={() => moveScroll(1)} | ||
| style={[styles.scrollbarButton]} | ||
| > | ||
| <View | ||
| style={{ | ||
| justifyContent: 'center', | ||
| alignItems: 'center', | ||
| // flex: 1, | ||
| }} | ||
| > | ||
| {Icon} | ||
| </View> | ||
| </Button> | ||
| </View> | ||
| )} | ||
| </View> | ||
| ); | ||
| }; | ||
|
|
||
| export default ScrollView; | ||
|
|
||
| const styles = StyleSheet.create({ | ||
| wrapper: { | ||
| display: 'flex', | ||
| flexDirection: 'row', | ||
| height: 'auto', | ||
| position: 'relative', | ||
| }, | ||
| content: { | ||
| flexGrow: 1, | ||
| }, | ||
| scrollbarTrack: { | ||
| height: '100%', | ||
| backgroundColor: theme.material, | ||
| }, | ||
| scrollbarButton: { | ||
| height: scrollbarSize, | ||
| width: scrollbarSize, | ||
| padding: 0, | ||
| }, | ||
| scrollbar: { | ||
| // height: '100%', | ||
| width: scrollbarSize, | ||
| overflow: 'hidden', | ||
| flex: 1, | ||
| }, | ||
| background: { | ||
| position: 'absolute', | ||
| top: 0, | ||
| right: 0, | ||
| bottom: 0, | ||
| left: 0, | ||
| }, | ||
| scrollbarBar: { | ||
| width: '100%', | ||
| }, | ||
| }); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| export { default } from './ScrollView'; |
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