react-native-material-kit/lib/utils.js

Bringing Material Design to React Native

// Utilities
//
// Created by ywu on 15/7/18.
//
import PropTypes from 'prop-types';
import { PixelRatio, Platform, processColor, TouchableWithoutFeedback } from 'react-native';
import { compose, indexOf, isNil, keys, not, partial, pickBy, reject } from 'ramda';
// Add some is-Type methods:
function isType(type, obj) {
    return Object.toString.call(obj) === `[object ${type}]`;
}
export const isArgument = partial(isType, ['Arguments']);
export const isFunction = partial(isType, ['Function']);
export const isString = partial(isType, ['String']);
export const isNumber = partial(isType, ['Number']);
export const isDate = partial(isType, ['Date']);
export const isRegExp = partial(isType, ['RegExp']);
export const isError = partial(isType, ['Error']);
// Remove keys with null value from the given object
const compact = reject(isNil);
const isNotNil = compose(not, isNil);
function capitalize(str) {
    return str.substring(0, 1).toUpperCase() + str.substring(1);
}
// Convert dips to pixels
const toPixels = PixelRatio.getPixelSizeForLayoutSize.bind(PixelRatio);
// Convert pixels back to dips
function toDips(px) {
    return px / PixelRatio.get();
}
// Convert native coordinate value into unit used in JSX
function convertCoordinate(value) {
    return Platform.OS === 'android' ? toDips(value) : value;
}
// Get font size according to the screen density
function getFontSize(sp) {
    return sp * PixelRatio.getFontScale();
}
// Extract the specified props from the given component instance.
// - {`object`} `view` the component instance
// - {`(v,k):boolean`} `filter` predictor to determine which prop should be extracted
function extractPropsBy(view, filter) {
    return pickBy(filter, view.props);
}
// Extract the specified props from the given component instance.
// - {`object`} `view` the component instance
// - {`array`|`object`} `propTypes` props definitions
function extractProps(view, propTypes) {
    const propNames = Array.isArray(propTypes) ? propTypes : keys(propTypes);
    const filter = (v, k) => indexOf(k, propNames) >= 0 && isNotNil(v);
    return pickBy(filter, view.props);
}
// Extract Touchable props from the given component instance.
// - {`object`} `view` the component instance
function extractTouchableProps(view) {
    return extractProps(view, Object.assign(Object.assign({}, TouchableWithoutFeedback.propTypes), { testID: PropTypes.string }));
}
// ## Public interface
export { capitalize, compact, toPixels, toDips, convertCoordinate, getFontSize, extractProps, extractPropsBy, extractTouchableProps, processColor as parseColor, };
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