react-native-paper
Version:
Material design for React Native
113 lines • 3.15 kB
JavaScript
function _extends() { _extends = Object.assign ? Object.assign.bind() : 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 * as React from 'react';
import { Animated, StyleSheet } from 'react-native';
import { getTextColor } from './utils';
import { useInternalTheme } from '../../core/theming';
import AnimatedText from '../Typography/AnimatedText';
/**
* Helper text is used in conjuction with input elements to provide additional hints for the user.
*
* ## Usage
* ```js
* import * as React from 'react';
* import { View } from 'react-native';
* import { HelperText, TextInput } from 'react-native-paper';
*
* const MyComponent = () => {
* const [text, setText] = React.useState('');
*
* const onChangeText = text => setText(text);
*
* const hasErrors = () => {
* return !text.includes('@');
* };
*
* return (
* <View>
* <TextInput label="Email" value={text} onChangeText={onChangeText} />
* <HelperText type="error" visible={hasErrors()}>
* Email address is invalid!
* </HelperText>
* </View>
* );
* };
*
* export default MyComponent;
* ```
*/
const HelperText = _ref => {
let {
style,
type = 'info',
visible = true,
theme: themeOverrides,
onLayout,
padding = 'normal',
disabled,
...rest
} = _ref;
const theme = useInternalTheme(themeOverrides);
const {
current: shown
} = React.useRef(new Animated.Value(visible ? 1 : 0));
let {
current: textHeight
} = React.useRef(0);
const {
scale
} = theme.animation;
const {
maxFontSizeMultiplier = 1.5
} = rest;
React.useEffect(() => {
if (visible) {
// show text
Animated.timing(shown, {
toValue: 1,
duration: 150 * scale,
useNativeDriver: true
}).start();
} else {
// hide text
Animated.timing(shown, {
toValue: 0,
duration: 180 * scale,
useNativeDriver: true
}).start();
}
}, [visible, scale, shown]);
const handleTextLayout = e => {
onLayout === null || onLayout === void 0 ? void 0 : onLayout(e);
textHeight = e.nativeEvent.layout.height;
};
const textColor = getTextColor({
theme,
disabled,
type
});
return /*#__PURE__*/React.createElement(AnimatedText, _extends({
onLayout: handleTextLayout,
style: [styles.text, padding !== 'none' ? styles.padding : {}, {
color: textColor,
opacity: shown,
transform: visible && type === 'error' ? [{
translateY: shown.interpolate({
inputRange: [0, 1],
outputRange: [-textHeight / 2, 0]
})
}] : []
}, style],
maxFontSizeMultiplier: maxFontSizeMultiplier
}, rest), rest.children);
};
const styles = StyleSheet.create({
text: {
fontSize: 12,
paddingVertical: 4
},
padding: {
paddingHorizontal: 12
}
});
export default HelperText;
//# sourceMappingURL=HelperText.js.map