rs-react-native-image-gallery
Version:
React Native Image Gallery with Thumbnails
114 lines • 17.6 kB
JavaScript
import React, { useCallback, useMemo, useRef } from 'react';
// react-native
import { Animated, Dimensions, PanResponder, View } from 'react-native';
// components
import { getMemoizedDistance, getScale } from './_helpers';
import { ANIMATION_DURATION, SWIPE_CLOSE_THRESHOLD, SWIPE_HORIZONTAL_THRESHOLD, SWIPE_VERTICAL_THRESHOLD } from './constants';
// ----------------------------------------------------------------------
var deviceHeight = Dimensions.get('window').height;
var PanContainer = function (_a) {
var children = _a.children, close = _a.close, setIsDragging = _a.setIsDragging;
var translationXY = useRef(new Animated.ValueXY()).current;
var scale = useRef(new Animated.Value(1)).current;
var _initialTouchesRef = useRef([]);
var onRelease = useCallback(function (_, gestureState) {
setIsDragging(false);
if (gestureState.dy > SWIPE_CLOSE_THRESHOLD && _initialTouchesRef.current.length === 1) {
// Animate out before closing
Animated.timing(translationXY.y, {
toValue: deviceHeight,
duration: ANIMATION_DURATION,
useNativeDriver: true
}).start(function () { return close(); });
return false;
}
// Reset with animation
Animated.parallel([
Animated.timing(scale, {
duration: ANIMATION_DURATION,
toValue: 1,
useNativeDriver: true
}),
Animated.timing(translationXY.x, {
duration: ANIMATION_DURATION,
toValue: 0,
useNativeDriver: true
}),
Animated.timing(translationXY.y, {
duration: ANIMATION_DURATION,
toValue: 0,
useNativeDriver: true
})
]).start();
}, [close, scale, translationXY.x, translationXY.y, setIsDragging]);
// Create panResponder with memoization
var panResponder = useMemo(function () {
return PanResponder.create({
onStartShouldSetPanResponder: function () { return true; },
onMoveShouldSetPanResponder: function (_, gestureState) {
var dx = gestureState.dx, dy = gestureState.dy, numberActiveTouches = gestureState.numberActiveTouches;
var absDx = Math.abs(dx);
var absDY = Math.abs(dy);
// Improved gesture recognition logic
if (absDY > SWIPE_VERTICAL_THRESHOLD && absDx <= SWIPE_HORIZONTAL_THRESHOLD && numberActiveTouches <= 1) {
return true;
}
if (absDx > 0 && numberActiveTouches <= 1) {
return false;
}
return true;
},
onPanResponderGrant: function (evt) {
setIsDragging(true);
_initialTouchesRef.current = evt.nativeEvent.touches;
translationXY.setOffset({ x: 0, y: 0 });
return true;
},
onPanResponderMove: function (evt, gestureState) {
var touches = evt.nativeEvent.touches;
var dx = gestureState.dx, dy = gestureState.dy;
if (touches.length <= 1) {
// Handle vertical swipe to close
if (Math.abs(dy) > SWIPE_VERTICAL_THRESHOLD) {
translationXY.y.setValue(dy);
return true;
}
// Handle horizontal swipe
if (Math.abs(dx) > 0) {
setIsDragging(false);
return false;
}
// Not enough touches for pinch-zoom
if (touches.length < 2) {
onRelease(evt, gestureState);
return false;
}
}
// Handle pinch zoom and pan
translationXY.x.setValue(dx);
translationXY.y.setValue(dy);
// Calculate scale for zooming using memoized version for better performance
var currentDistance = getMemoizedDistance(touches);
var initialDistance = getMemoizedDistance(_initialTouchesRef.current);
if (currentDistance && initialDistance) {
var newScale = getScale(currentDistance, initialDistance);
scale.setValue(newScale);
}
return true;
},
onPanResponderRelease: onRelease,
onPanResponderTerminate: function () { return true; },
onPanResponderTerminationRequest: function () { return true; }
});
}, [onRelease, setIsDragging, translationXY, scale]);
return (<View style={{ flex: 1 }}>
<Animated.View {...panResponder.panHandlers} style={{
flex: 1,
transform: [{ translateX: translationXY.x }, { translateY: translationXY.y }, { scale: scale }]
}}>
{children}
</Animated.View>
</View>);
};
export default React.memo(PanContainer);
//# 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React, { ReactNode, useCallback, useMemo, useRef } from 'react';\n// react-native\nimport { Animated, Dimensions, GestureResponderEvent, NativeTouchEvent, PanResponder, PanResponderGestureState, View } from 'react-native';\n// components\nimport { getMemoizedDistance, getScale } from './_helpers';\nimport { ANIMATION_DURATION, SWIPE_CLOSE_THRESHOLD, SWIPE_HORIZONTAL_THRESHOLD, SWIPE_VERTICAL_THRESHOLD } from './constants';\n\n// ----------------------------------------------------------------------\n\nconst { height: deviceHeight } = Dimensions.get('window');\n\nconst PanContainer = ({\n\tchildren,\n\tclose,\n\tsetIsDragging\n}: {\n\tchildren: ReactNode;\n\tclose: () => void;\n\tsetIsDragging: (isDragging: boolean) => void;\n}) => {\n\tconst translationXY = useRef(new Animated.ValueXY()).current;\n\tconst scale = useRef(new Animated.Value(1)).current;\n\tconst _initialTouchesRef = useRef<Array<NativeTouchEvent>>([]);\n\n\tconst onRelease = useCallback(\n\t\t(_: GestureResponderEvent, gestureState: PanResponderGestureState): void | boolean => {\n\t\t\tsetIsDragging(false);\n\n\t\t\tif (gestureState.dy > SWIPE_CLOSE_THRESHOLD && _initialTouchesRef.current.length === 1) {\n\t\t\t\t// Animate out before closing\n\t\t\t\tAnimated.timing(translationXY.y, {\n\t\t\t\t\ttoValue: deviceHeight,\n\t\t\t\t\tduration: ANIMATION_DURATION,\n\t\t\t\t\tuseNativeDriver: true\n\t\t\t\t}).start(() => close());\n\t\t\t\treturn false;\n\t\t\t}\n\n\t\t\t// Reset with animation\n\t\t\tAnimated.parallel([\n\t\t\t\tAnimated.timing(scale, {\n\t\t\t\t\tduration: ANIMATION_DURATION,\n\t\t\t\t\ttoValue: 1,\n\t\t\t\t\tuseNativeDriver: true\n\t\t\t\t}),\n\t\t\t\tAnimated.timing(translationXY.x, {\n\t\t\t\t\tduration: ANIMATION_DURATION,\n\t\t\t\t\ttoValue: 0,\n\t\t\t\t\tuseNativeDriver: true\n\t\t\t\t}),\n\t\t\t\tAnimated.timing(translationXY.y, {\n\t\t\t\t\tduration: ANIMATION_DURATION,\n\t\t\t\t\ttoValue: 0,\n\t\t\t\t\tuseNativeDriver: true\n\t\t\t\t})\n\t\t\t]).start();\n\t\t},\n\t\t[close, scale, translationXY.x, translationXY.y, setIsDragging]\n\t);\n\n\t// Create panResponder with memoization\n\tconst panResponder = useMemo(\n\t\t() =>\n\t\t\tPanResponder.create({\n\t\t\t\tonStartShouldSetPanResponder: () => true,\n\t\t\t\tonMoveShouldSetPanResponder: (_: GestureResponderEvent, gestureState: PanResponderGestureState) => {\n\t\t\t\t\tconst { dx, dy, numberActiveTouches } = gestureState;\n\t\t\t\t\tconst absDx = Math.abs(dx);\n\t\t\t\t\tconst absDY = Math.abs(dy);\n\n\t\t\t\t\t// Improved gesture recognition logic\n\t\t\t\t\tif (absDY > SWIPE_VERTICAL_THRESHOLD && absDx <= SWIPE_HORIZONTAL_THRESHOLD && numberActiveTouches <= 1) {\n\t\t\t\t\t\treturn true;\n\t\t\t\t\t}\n\t\t\t\t\tif (absDx > 0 && numberActiveTouches <= 1) {\n\t\t\t\t\t\treturn false;\n\t\t\t\t\t}\n\t\t\t\t\treturn true;\n\t\t\t\t},\n\t\t\t\tonPanResponderGrant: (evt: GestureResponderEvent) => {\n\t\t\t\t\tsetIsDragging(true);\n\t\t\t\t\t_initialTouchesRef.current = evt.nativeEvent.touches;\n\t\t\t\t\ttranslationXY.setOffset({ x: 0, y: 0 });\n\t\t\t\t\treturn true;\n\t\t\t\t},\n\t\t\t\tonPanResponderMove: (evt: GestureResponderEvent, gestureState: PanResponderGestureState) => {\n\t\t\t\t\tconst { touches } = evt.nativeEvent;\n\t\t\t\t\tconst { dx, dy } = gestureState;\n\n\t\t\t\t\tif (touches.length <= 1) {\n\t\t\t\t\t\t// Handle vertical swipe to close\n\t\t\t\t\t\tif (Math.abs(dy) > SWIPE_VERTICAL_THRESHOLD) {\n\t\t\t\t\t\t\ttranslationXY.y.setValue(dy);\n\t\t\t\t\t\t\treturn true;\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\t// Handle horizontal swipe\n\t\t\t\t\t\tif (Math.abs(dx) > 0) {\n\t\t\t\t\t\t\tsetIsDragging(false);\n\t\t\t\t\t\t\treturn false;\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\t// Not enough touches for pinch-zoom\n\t\t\t\t\t\tif (touches.length < 2) {\n\t\t\t\t\t\t\tonRelease(evt, gestureState);\n\t\t\t\t\t\t\treturn false;\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\n\t\t\t\t\t// Handle pinch zoom and pan\n\t\t\t\t\ttranslationXY.x.setValue(dx);\n\t\t\t\t\ttranslationXY.y.setValue(dy);\n\n\t\t\t\t\t// Calculate scale for zooming using memoized version for better performance\n\t\t\t\t\tconst currentDistance = getMemoizedDistance(touches);\n\t\t\t\t\tconst initialDistance = getMemoizedDistance(_initialTouchesRef.current);\n\t\t\t\t\tif (currentDistance && initialDistance) {\n\t\t\t\t\t\tconst newScale = getScale(currentDistance, initialDistance);\n\t\t\t\t\t\tscale.setValue(newScale);\n\t\t\t\t\t}\n\n\t\t\t\t\treturn true;\n\t\t\t\t},\n\t\t\t\tonPanResponderRelease: onRelease,\n\t\t\t\tonPanResponderTerminate: () => true,\n\t\t\t\tonPanResponderTerminationRequest: () => true\n\t\t\t}),\n\t\t[onRelease, setIsDragging, translationXY, scale]\n\t);\n\n\treturn (\n\t\t<View style={{ flex: 1 }}>\n\t\t\t<Animated.View\n\t\t\t\t{...panResponder.panHandlers}\n\t\t\t\tstyle={{\n\t\t\t\t\tflex: 1,\n\t\t\t\t\ttransform: [{ translateX: translationXY.x }, { translateY: translationXY.y }, { scale }]\n\t\t\t\t}}>\n\t\t\t\t{children}\n\t\t\t</Animated.View>\n\t\t</View>\n\t);\n};\n\nexport default React.memo(PanContainer);\n"]}