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DefaultTabBar.js
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DefaultTabBar.js
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const React = require('react');
const ReactNative = require('react-native');
const PropTypes = require('prop-types');
const {
StyleSheet,
Text,
View,
Animated,
} = ReactNative;
const Button = require('./Button');
const createReactClass = require('create-react-class');
const DefaultTabBar = createReactClass({
propTypes: {
goToPage: PropTypes.func,
activeTab: PropTypes.number,
tabs: PropTypes.array,
backgroundColor: PropTypes.string,
activeTextColor: PropTypes.string,
tabBarPosition: PropTypes.string,
inactiveTextColor: PropTypes.string,
containerHeight: PropTypes.number,
textStyle: Text.propTypes.style,
tabStyle: View.propTypes.style,
renderTab: PropTypes.func,
underlineStyle: View.propTypes.style,
},
getDefaultProps() {
return {
activeTextColor: 'navy',
inactiveTextColor: 'black',
backgroundColor: null,
};
},
renderTabOption(name, page) {
},
renderTab(name, page, isTabActive, onPressHandler) {
const { activeTextColor, inactiveTextColor, textStyle, tabBarPosition, containerHeight, verticalTabs, } = this.props;
const textColor = isTabActive ? activeTextColor : inactiveTextColor;
const fontWeight = isTabActive ? 'bold' : 'normal';
const numberOfTabs = this.props.tabs.length;
const tabUnderlineStyle = {
position: 'absolute',
width: 4,
height: containerHeight / numberOfTabs,
backgroundColor: 'navy',
right: (tabBarPosition === 'left') ? 0 : null,
left: (tabBarPosition === 'right') ? 0 : null,
bottom: 0,
opacity: (isTabActive) ? 1 : 0
};
return <Button
style={styles.flexOne}
key={name}
accessible={true}
accessibilityLabel={name}
accessibilityTraits='button'
onPress={() => onPressHandler(page)}
>
<View style={[styles.tab, this.props.tabStyle, ]}>
<Text style={[{color: textColor, fontWeight, }, textStyle, ]}>
{name}
</Text>
{verticalTabs &&
<View style={[tabUnderlineStyle, this.props.underlineStyle, ]} />
}
</View>
</Button>;
},
render() {
const containerWidth = this.props.containerWidth;
const verticalTabs = this.props.verticalTabs;
const numberOfTabs = this.props.tabs.length;
const tabUnderlineStyle = {
position: 'absolute',
width: containerWidth / numberOfTabs,
height: 4,
backgroundColor: 'navy',
bottom: 0,
};
const left = this.props.scrollValue.interpolate({
inputRange: [0, 1, ], outputRange: [0, containerWidth / numberOfTabs, ],
});
return (
<View style={[styles.tabs, {backgroundColor: this.props.backgroundColor, }, this.props.style, ]}>
{this.props.tabs.map((name, page) => {
const isTabActive = this.props.activeTab === page;
const renderTab = this.props.renderTab || this.renderTab;
return renderTab(name, page, isTabActive, this.props.goToPage);
})}
{!verticalTabs &&
<Animated.View style={[tabUnderlineStyle, { left, }, this.props.underlineStyle, ]} />
}
</View>
);
},
});
const styles = StyleSheet.create({
tab: {
flex: 1,
alignItems: 'center',
justifyContent: 'center',
paddingBottom: 10,
paddingHorizontal: 10,
},
flexOne: {
flex: 1,
},
tabs: {
flexDirection: 'row',
justifyContent: 'space-around',
borderWidth: 1,
borderTopWidth: 0,
borderLeftWidth: 0,
borderRightWidth: 0,
borderColor: '#ccc',
},
});
module.exports = DefaultTabBar;