@georstat/react-native-image-gallery/lib/module/PanContainer.js

React Native Image Gallery with Thumbnails

function _extends() { _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); }

import React, { useRef } from 'react';
import { Animated, PanResponder, View } from 'react-native';
import { getDistance, getScale } from './_helpers';

const PanContainer = _ref => {
  let {
    children,
    close,
    setIsDragging
  } = _ref;
  const translationXY = useRef(new Animated.ValueXY()).current;
  const scale = useRef(new Animated.Value(1)).current;
  let _initialTouches = useRef().current;

  const onRelease = (_, gestureState) => {
    setIsDragging(false);

    if (gestureState.dy > 180 && _initialTouches.length === 1) {
      close();
      return false;
    }

    Animated.parallel([Animated.timing(scale, {
      duration: 100,
      toValue: 1,
      useNativeDriver: true
    }), Animated.timing(translationXY.x, {
      duration: 100,
      toValue: 0,
      useNativeDriver: true
    }), Animated.timing(translationXY.y, {
      duration: 100,
      toValue: 0,
      useNativeDriver: true
    })]).start();
  };

  const panResponder = React.useRef(PanResponder.create({
    onStartShouldSetPanResponder: () => true,
    onMoveShouldSetPanResponder: (_, gestureState) => {
      const absDx = Math.abs(gestureState.dx);
      const absDY = Math.abs(gestureState.dy);

      if (absDY > 5 && absDx <= 2 && gestureState.numberActiveTouches <= 1) {
        return true;
      }

      if (absDx > 0 && gestureState.numberActiveTouches <= 1) {
        return false;
      }

      return true;
    },
    // onMoveShouldSetPanResponderCapture: (evt, gestureState) => true,
    onPanResponderGrant: evt => {
      setIsDragging(true);
      _initialTouches = evt.nativeEvent.touches;
      translationXY.setOffset({
        x: 0,
        y: 0
      });
      return true;
    },
    onPanResponderMove: (evt, gestureState) => {
      const {
        touches
      } = evt.nativeEvent;

      if (touches.length <= 1 && Math.abs(gestureState.dy) > 10) {
        translationXY.y.setValue(gestureState.dy);
        return true;
      }

      if (touches.length <= 1 && Math.abs(gestureState.dx) > 0) {
        setIsDragging(false);
        return false;
      }

      if (touches.length < 2) {
        // Trigger a release
        onRelease(evt, gestureState);
        return false;
      }

      const {
        dx,
        dy
      } = gestureState;
      translationXY.x.setValue(dx);
      translationXY.y.setValue(dy); // for scaling photo

      const currentDistance = getDistance(touches);
      const initialDistance = getDistance(_initialTouches);
      const newScale = getScale(currentDistance, initialDistance);
      scale.setValue(newScale);
      return true;
    },
    onPanResponderTerminationRequest: () => {
      return true;
    },
    onPanResponderRelease: (evt, gestureState) => {
      onRelease(evt, gestureState);
      return true;
    },
    onPanResponderTerminate: () => true
  })).current;
  return /*#__PURE__*/React.createElement(View, null, /*#__PURE__*/React.createElement(Animated.View, _extends({}, panResponder.panHandlers, {
    style: {
      transform: [{
        translateX: translationXY.x
      }, {
        translateY: translationXY.y
      }, {
        scale: scale
      }]
    }
  }), children));
};

export default PanContainer;
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