TabBarTop.js.flow
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/* @flow */
import * as React from 'react';
import { Animated, StyleSheet } from 'react-native';
import { TabBar } from 'react-native-tab-view';
import TabBarIcon from './TabBarIcon';
import type {
NavigationAction,
NavigationRoute,
NavigationScreenProp,
NavigationState,
ViewStyleProp,
TextStyleProp,
} from '../../TypeDefinition';
import type { TabScene } from './TabView';
type Props = {
activeTintColor: string,
inactiveTintColor: string,
showIcon: boolean,
showLabel: boolean,
upperCaseLabel: boolean,
allowFontScaling: boolean,
position: Animated.Value,
navigation: NavigationScreenProp<NavigationState>,
jumpToIndex: (index: number) => void,
getLabel: (scene: TabScene) => ?(React.Node | string),
getOnPress: (
previousScene: NavigationRoute,
scene: TabScene
) => ({
previousScene: NavigationRoute,
scene: TabScene,
jumpToIndex: (index: number) => void,
}) => void,
renderIcon: (scene: TabScene) => React.Element<*>,
labelStyle?: TextStyleProp,
iconStyle?: ViewStyleProp,
};
export default class TabBarTop extends React.PureComponent<Props> {
static defaultProps = {
activeTintColor: '#fff',
inactiveTintColor: '#fff',
showIcon: false,
showLabel: true,
upperCaseLabel: true,
allowFontScaling: true,
};
_renderLabel = (scene: TabScene) => {
const {
position,
navigation,
activeTintColor,
inactiveTintColor,
showLabel,
upperCaseLabel,
labelStyle,
allowFontScaling,
} = this.props;
if (showLabel === false) {
return null;
}
const { index } = scene;
const { routes } = navigation.state;
// Prepend '-1', so there are always at least 2 items in inputRange
const inputRange = [-1, ...routes.map((x: *, i: number) => i)];
const outputRange = inputRange.map(
(inputIndex: number) =>
inputIndex === index ? activeTintColor : inactiveTintColor
);
const color = position.interpolate({
inputRange,
outputRange: (outputRange: Array<string>),
});
const tintColor = scene.focused ? activeTintColor : inactiveTintColor;
const label = this.props.getLabel({ ...scene, tintColor });
if (typeof label === 'string') {
return (
<Animated.Text
style={[styles.label, { color }, labelStyle]}
allowFontScaling={allowFontScaling}
>
{upperCaseLabel ? label.toUpperCase() : label}
</Animated.Text>
);
}
if (typeof label === 'function') {
return label({ ...scene, tintColor });
}
return label;
};
_renderIcon = (scene: TabScene) => {
const {
position,
navigation,
activeTintColor,
inactiveTintColor,
renderIcon,
showIcon,
iconStyle,
} = this.props;
if (showIcon === false) {
return null;
}
return (
<TabBarIcon
position={position}
navigation={navigation}
activeTintColor={activeTintColor}
inactiveTintColor={inactiveTintColor}
renderIcon={renderIcon}
scene={scene}
style={[styles.icon, iconStyle]}
/>
);
};
_handleOnPress = (scene: TabScene) => {
const { getOnPress, jumpToIndex, navigation }: Props = this.props;
const previousScene = navigation.state.routes[navigation.state.index];
const onPress = getOnPress(previousScene, scene);
if (onPress) {
onPress({ previousScene, scene, jumpToIndex });
} else {
jumpToIndex(scene.index);
}
};
render() {
// TODO: Define full proptypes
const props: any = this.props;
return (
<TabBar
{...props}
onTabPress={this._handleOnPress}
jumpToIndex={() => {}}
renderIcon={this._renderIcon}
renderLabel={this._renderLabel}
/>
);
}
}
const styles = StyleSheet.create({
icon: {
height: 24,
width: 24,
},
label: {
textAlign: 'center',
fontSize: 13,
margin: 8,
backgroundColor: 'transparent',
},
});