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Draggable.tsx
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Draggable.tsx
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/**
* * https://github.com/tongyy/react-native-draggable
*
*/
import React from 'react';
import {
View,
Text,
Image,
PanResponder,
Animated,
Dimensions,
TouchableOpacity,
StyleSheet,
GestureResponderEvent,
PanResponderGestureState,
StyleProp,
} from 'react-native';
import PropTypes from 'prop-types';
import { ViewStyle } from 'react-native/Libraries/StyleSheet/StyleSheet';
function clamp(number: number, min: number, max: number) {
return Math.max(min, Math.min(number, max));
}
interface IProps {
/**** props that should probably be removed in favor of "children" */
renderText?: string;
isCircle?: boolean;
renderSize?: number;
imageSource?: number;
renderColor?: string;
/**** */
children?: React.ReactNode;
shouldReverse?: boolean;
disabled?: boolean;
debug?: boolean;
animatedViewProps?: object;
touchableOpacityProps?: object;
onDrag?: (e: GestureResponderEvent, gestureState: PanResponderGestureState) => void;
onShortPressRelease?: (event: GestureResponderEvent) => void;
onDragRelease?: (e: GestureResponderEvent, gestureState: PanResponderGestureState) => void;
onLongPress?: (event: GestureResponderEvent) => void;
onPressIn?: (event: GestureResponderEvent) => void;
onPressOut?: (event: GestureResponderEvent) => void;
onRelease?: (event: GestureResponderEvent, wasDragging: boolean) => void;
onReverse?: () => {x: number, y: number},
x?: number;
y?: number;
// z/elevation should be removed because it doesn't sync up visually and haptically
z?: number;
minX?: number;
minY?: number;
maxX?: number;
maxY?: number;
};
export default function Draggable(props: IProps) {
const {
renderText,
isCircle,
renderSize,
imageSource,
renderColor,
children,
shouldReverse,
disabled,
debug,
animatedViewProps,
touchableOpacityProps,
onDrag,
onShortPressRelease,
onDragRelease,
onLongPress,
onPressIn,
onPressOut,
onRelease,
x,
y,
z,
minX,
minY,
maxX,
maxY,
} = props;
// The Animated object housing our xy value so that we can spring back
const pan = React.useRef(new Animated.ValueXY());
// Always set to xy value of pan, would like to remove
const offsetFromStart = React.useRef({x: 0, y: 0});
// Width/Height of Draggable (renderSize is arbitrary if children are passed in)
const childSize = React.useRef({x: renderSize, y: renderSize});
// Top/Left/Right/Bottom location on screen from start of most recent touch
const startBounds = React.useRef({top: 0, bottom: 0, left: 0, right: 0});
// Whether we're currently dragging or not
const isDragging = React.useRef(false);
const getBounds = React.useCallback(() => {
const left = x + offsetFromStart.current.x;
const top = y + offsetFromStart.current.y;
return {
left,
top,
right: left + childSize.current.x,
bottom: top + childSize.current.y,
};
}, [x, y]);
const shouldStartDrag = React.useCallback(
gs => {
return !disabled && (Math.abs(gs.dx) > 2 || Math.abs(gs.dy) > 2);
},
[disabled],
);
const reversePosition = React.useCallback(() => {
Animated.spring(pan.current, {
toValue: {x: 0, y: 0},
useNativeDriver: false,
}).start();
}, [pan]);
const onPanResponderRelease = React.useCallback(
(e: GestureResponderEvent, gestureState: PanResponderGestureState) => {
isDragging.current = false;
if (onDragRelease) {
onDragRelease(e, gestureState);
onRelease(e, true);
}
if (!shouldReverse) {
pan.current.flattenOffset();
} else {
reversePosition();
}
},
[onDragRelease, shouldReverse, onRelease, reversePosition],
);
const onPanResponderGrant = React.useCallback(
(e: GestureResponderEvent, gestureState: PanResponderGestureState) => {
startBounds.current = getBounds();
isDragging.current = true;
if (!shouldReverse) {
pan.current.setOffset(offsetFromStart.current);
pan.current.setValue({x: 0, y: 0});
}
},
[getBounds, shouldReverse],
);
const handleOnDrag = React.useCallback(
(e: GestureResponderEvent, gestureState: PanResponderGestureState) => {
const {dx, dy} = gestureState;
const {top, right, left, bottom} = startBounds.current;
const far = 999999999;
const changeX = clamp(
dx,
Number.isFinite(minX) ? minX - left : -far,
Number.isFinite(maxX) ? maxX - right : far,
);
const changeY = clamp(
dy,
Number.isFinite(minY) ? minY - top : -far,
Number.isFinite(maxY) ? maxY - bottom : far,
);
pan.current.setValue({x: changeX, y: changeY});
onDrag(e, gestureState);
},
[maxX, maxY, minX, minY, onDrag],
);
const panResponder = React.useMemo(() => {
return PanResponder.create({
onMoveShouldSetPanResponder: (_, gestureState) =>
shouldStartDrag(gestureState),
onMoveShouldSetPanResponderCapture: (_, gestureState) =>
shouldStartDrag(gestureState),
onPanResponderGrant,
onPanResponderMove: Animated.event([], {
// Typed incorrectly https://reactnative.dev/docs/panresponder
listener: handleOnDrag,
useNativeDriver: false,
}),
onPanResponderRelease,
});
}, [
handleOnDrag,
onPanResponderGrant,
onPanResponderRelease,
shouldStartDrag,
]);
// TODO Figure out a way to destroy and remove offsetFromStart entirely
React.useEffect(() => {
const curPan = pan.current; // Using an instance to avoid losing the pointer before the cleanup
if (!shouldReverse) {
curPan.addListener(c => (offsetFromStart.current = c));
}
return () => {
// Typed incorrectly
curPan.removeAllListeners();
};
}, [shouldReverse]);
const positionCss: StyleProp<ViewStyle> = React.useMemo(() => {
const Window = Dimensions.get('window');
return {
position: 'absolute',
top: 0,
left: 0,
width: Window.width,
height: Window.height,
};
}, []);
const dragItemCss = React.useMemo(() => {
const style: StyleProp<ViewStyle> = {
top: y,
left: x,
elevation: z,
zIndex: z,
};
if (renderColor) {
style.backgroundColor = renderColor;
}
if (isCircle) {
style.borderRadius = renderSize;
}
if (children) {
return {
...style,
alignSelf: 'baseline',
};
}
return {
...style,
justifyContent: 'center',
width: renderSize,
height: renderSize,
};
}, [children, isCircle, renderColor, renderSize, x, y, z]);
const touchableContent = React.useMemo(() => {
if (children) {
return children;
} else if (imageSource) {
return (
<Image
style={{width: renderSize, height: renderSize}}
source={imageSource}
/>
);
} else {
return <Text style={styles.text}>{renderText}</Text>;
}
}, [children, imageSource, renderSize, renderText]);
const handleOnLayout = React.useCallback(event => {
const {height, width} = event.nativeEvent.layout;
childSize.current = {x: width, y: height};
}, []);
const handlePressOut = React.useCallback(
(event: GestureResponderEvent) => {
onPressOut(event);
if (!isDragging.current) {
onRelease(event, false);
}
},
[onPressOut, onRelease],
);
const getDebugView = React.useCallback(() => {
const {width, height} = Dimensions.get('window');
const far = 9999;
const constrained = minX || maxX || minY || maxY;
if (!constrained) {
return null;
} // could show other debug info here
const left = minX || -far;
const right = maxX ? width - maxX : -far;
const top = minY || -far;
const bottom = maxY ? height - maxY : -far;
return (
<View
pointerEvents="box-none"
style={{left, right, top, bottom, ...styles.debugView}}
/>
);
}, [maxX, maxY, minX, minY]);
return (
<View pointerEvents="box-none" style={positionCss}>
{debug && getDebugView()}
<Animated.View
pointerEvents="box-none"
{...animatedViewProps}
{...panResponder.panHandlers}
style={pan.current.getLayout()}>
<TouchableOpacity
{...touchableOpacityProps}
onLayout={handleOnLayout}
style={dragItemCss}
disabled={disabled}
onPress={onShortPressRelease}
onLongPress={onLongPress}
onPressIn={onPressIn}
onPressOut={handlePressOut}>
{touchableContent}
</TouchableOpacity>
</Animated.View>
</View>
);
}
/***** Default props and types */
Draggable.defaultProps = {
renderText: '+',
renderSize: 36,
shouldReverse: false,
disabled: false,
debug: false,
onDrag: () => {},
onShortPressRelease: () => {},
onDragRelease: () => {},
onLongPress: () => {},
onPressIn: () => {},
onPressOut: () => {},
onRelease: () => {},
x: 0,
y: 0,
z: 1,
};
const styles = StyleSheet.create({
text: {color: '#fff', textAlign: 'center'},
debugView: {
backgroundColor: '#ff000044',
position: 'absolute',
borderColor: '#fced0ecc',
borderWidth: 4,
},
});