react-native-new-ui-datepicker
Version:
Customizable date picker for React Native
130 lines (128 loc) • 5.82 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = void 0;
var _react = _interopRequireWildcard(require("react"));
var _reactNative = require("react-native");
var _wheelPicker = _interopRequireDefault(require("./wheel-picker.style"));
var _wheelPickerItem = _interopRequireDefault(require("./wheel-picker-item"));
function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
function _getRequireWildcardCache(e) { if ("function" != typeof WeakMap) return null; var r = new WeakMap(), t = new WeakMap(); return (_getRequireWildcardCache = function (e) { return e ? t : r; })(e); }
function _interopRequireWildcard(e, r) { if (!r && e && e.__esModule) return e; if (null === e || "object" != typeof e && "function" != typeof e) return { default: e }; var t = _getRequireWildcardCache(r); if (t && t.has(e)) return t.get(e); var n = { __proto__: null }, a = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var u in e) if ("default" !== u && {}.hasOwnProperty.call(e, u)) { var i = a ? Object.getOwnPropertyDescriptor(e, u) : null; i && (i.get || i.set) ? Object.defineProperty(n, u, i) : n[u] = e[u]; } return n.default = e, t && t.set(e, n), n; }
function _extends() { return _extends = Object.assign ? Object.assign.bind() : function (n) { for (var e = 1; e < arguments.length; e++) { var t = arguments[e]; for (var r in t) ({}).hasOwnProperty.call(t, r) && (n[r] = t[r]); } return n; }, _extends.apply(null, arguments); }
const WheelPicker = ({
selectedIndex,
options,
onChange,
selectedIndicatorStyle = {},
containerStyle = {},
itemStyle = {},
itemTextStyle = {},
itemHeight = 40,
scaleFunction = x => 1.0 ** x,
rotationFunction = x => 1 - Math.pow(1 / 2, x),
opacityFunction = x => Math.pow(1 / 3, x),
visibleRest = 2,
decelerationRate = 'fast',
containerProps = {},
flatListProps = {}
}) => {
const flatListRef = (0, _react.useRef)(null);
const [scrollY] = (0, _react.useState)(new _reactNative.Animated.Value(selectedIndex * itemHeight));
const containerHeight = (1 + visibleRest * 2) * itemHeight;
const paddedOptions = (0, _react.useMemo)(() => {
const array = [...options];
for (let i = 0; i < visibleRest; i++) {
array.unshift(null);
array.push(null);
}
return array;
}, [options, visibleRest]);
const offsets = (0, _react.useMemo)(() => [...Array(paddedOptions.length)].map((_, i) => i * itemHeight), [paddedOptions, itemHeight]);
const currentScrollIndex = (0, _react.useMemo)(() => _reactNative.Animated.add(_reactNative.Animated.divide(scrollY, itemHeight), visibleRest), [visibleRest, scrollY, itemHeight]);
const handleMomentumScrollEnd = event => {
// Due to list bounciness when scrolling to the start or the end of the list
// the offset might be negative or over the last item.
// We therefore clamp the offset to the supported range.
const offsetY = Math.min(itemHeight * (options.length - 1), Math.max(event.nativeEvent.contentOffset.y, 0));
let index = Math.floor(Math.floor(offsetY) / itemHeight);
const last = Math.floor(offsetY % itemHeight);
if (last > itemHeight / 2) {
index++;
}
if (index !== selectedIndex) {
onChange(index);
}
};
(0, _react.useEffect)(() => {
if (selectedIndex < 0 || selectedIndex >= options.length) {
throw new Error(`Selected index ${selectedIndex} is out of bounds [0, ${options.length - 1}]`);
}
}, [selectedIndex, options]);
/**
* If selectedIndex is changed from outside (not via onChange) we need to scroll to the specified index.
* This ensures that what the user sees as selected in the picker always corresponds to the value state.
*/
(0, _react.useEffect)(() => {
var _flatListRef$current;
(_flatListRef$current = flatListRef.current) === null || _flatListRef$current === void 0 || _flatListRef$current.scrollToIndex({
index: selectedIndex,
animated: _reactNative.Platform.OS === 'ios'
});
}, [selectedIndex, itemHeight]);
return /*#__PURE__*/_react.default.createElement(_reactNative.View, _extends({
style: [_wheelPicker.default.container, {
height: containerHeight
}, containerStyle]
}, containerProps), /*#__PURE__*/_react.default.createElement(_reactNative.View, {
style: [_wheelPicker.default.selectedIndicator, selectedIndicatorStyle, {
transform: [{
translateY: -itemHeight / 2
}],
height: itemHeight
}]
}), /*#__PURE__*/_react.default.createElement(_reactNative.Animated.FlatList, _extends({}, flatListProps, {
ref: flatListRef,
style: _wheelPicker.default.scrollView,
showsVerticalScrollIndicator: false,
onScroll: _reactNative.Animated.event([{
nativeEvent: {
contentOffset: {
y: scrollY
}
}
}], {
useNativeDriver: true
}),
onMomentumScrollEnd: handleMomentumScrollEnd,
snapToOffsets: offsets,
decelerationRate: decelerationRate,
initialScrollIndex: selectedIndex,
getItemLayout: (_, index) => ({
length: itemHeight,
offset: itemHeight * index,
index
}),
data: paddedOptions,
keyExtractor: (_, index) => index.toString(),
renderItem: ({
item: option,
index
}) => /*#__PURE__*/_react.default.createElement(_wheelPickerItem.default, {
key: `option-${index}`,
index: index,
option: option,
style: itemStyle,
textStyle: itemTextStyle,
height: itemHeight,
currentScrollIndex: currentScrollIndex,
scaleFunction: scaleFunction,
rotationFunction: rotationFunction,
opacityFunction: opacityFunction,
visibleRest: visibleRest
})
})));
};
var _default = exports.default = WheelPicker;
//# sourceMappingURL=wheel-picker.js.map