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index.js
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index.js
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import React, { Component, PropTypes } from 'react';
import ReactNative, {
StyleSheet,
Text,
Image,
View,
Animated,
ScrollView,
TouchableHighlight,
PixelRatio,
Platform,
Dimensions,
TouchableOpacity
} from "react-native"
let screen = Dimensions.get('window');
let styles = StyleSheet.create({
scrollOuter: {
//width: 40
},
navBar: {
width: screen.width,
flexDirection: 'column',
},
navItem: {
marginLeft: 5,
marginRight: 5,
paddingTop: 10,
paddingBottom: 10,
paddingLeft: 7,
paddingRight: 7,
alignItems: 'center',
height: 45,
},
navItemText: {
marginTop: 6,
fontSize: 13,
},
activeBottom: {
position: 'absolute',
left: 0,
bottom: 1,
marginTop: 2,
},
activeBottomLine: {
borderBottomWidth: 1,
}
});
let bottomAdded = -15;
export default class SegmentedButton extends Component {
static defaultProps = {
tinyColor: '#434343',
activeTinyColor: '#00afa5'
}
static propTypes = {
items: PropTypes.array.isRequired,
};
constructor(props) {
super(props);
this.state = {
activeIndex: this.props.activeIndex || 0,
x: new Animated.Value(0),
abWidth: new Animated.Value(0)
}
}
getActiveIndex() {
return this.state.activeIndex;
}
componentDidMount() {
var thiz = this;
if(!thiz.props.items || !thiz.props.items.length){
return null
}
}
_firstLayout=true;
onLayout(){
var thiz = this;
if(!thiz._firstLayout){
return
}
thiz._firstLayout = false;
thiz.refs[0].measureLayout(
ReactNative.findNodeHandle(thiz.refs.scrollView),
(ox, oy, width, height, pageX, pageY) => {
console.log(width);
Animated.parallel([ // 在decay之后并行执行:
Animated.spring( // 支持: spring, decay, timing,过渡的动画方式
thiz.state.abWidth,
{
toValue: width + bottomAdded, // 目标值
friction: 7 // 动画方式的参数
}
),
Animated.spring( // 支持: spring, decay, timing,过渡的动画方式
thiz.state.x,
{
toValue: ox - bottomAdded / 2, // 目标值
friction: 7 // 动画方式的参数
}
),
]).start();
}
);
}
_onSegmentBtnPress(e, index) {
var thiz = this;
thiz.setState({
activeIndex: index,
});
var item = thiz.refs[index];
item.measureLayout(
ReactNative.findNodeHandle(thiz.refs.scrollView),
(ox, oy, width, height, pageX, pageY) => {
Animated.parallel([
Animated.spring(
thiz.state.abWidth,
{
toValue: width + bottomAdded,
friction: 7
}
),
Animated.spring(
thiz.state.x,
{
toValue: ox - bottomAdded / 2,
friction: 7
}
),
]).start();
}
);
thiz.props.onSegmentBtnPress(e, index);
}
render() {
var thiz = this;
var navItems = thiz.props.items;
if(!navItems || !navItems.length){
return null
}
var activeItemIndex = thiz.state.activeIndex;
var doms = navItems.map(function (item, index) {
let key = `segment_${index}`;
let label;
if(typeof item === 'string'){
label = item;
}else {
label = item.text;
}
if (activeItemIndex == index) {
return (
<TouchableOpacity style={[styles.navItem,{marginBottom:1.5}]} key={key} ref={index}>
<Text style={[styles.navItemText,{color: thiz.props.activeTinyColor}]}>{label}</Text>
</TouchableOpacity>
);
} else {
return (
<TouchableOpacity style={[styles.navItem,{}]} key={key} ref={index} onPress={(e)=>{
thiz._onSegmentBtnPress(e,index);
}}>
<Text style={[styles.navItemText,{color: thiz.props.tinyColor}]}>{label}</Text>
</TouchableOpacity>
);
}
});
return (
<View onLayout={this.onLayout.bind(this)} style={[styles.scrollOuter,{alignItems:'flex-start',justifyContent: 'center'},thiz.props.style]}>
<ScrollView
ref="scrollView"
horizontal={true}
showsHorizontalScrollIndicator={false}
directionalLockEnabled={true}
automaticallyAdjustContentInsets={false}
>
{doms}
<Animated.View style={[styles.activeBottom,styles.activeBottomLine,{borderColor: thiz.props.activeTinyColor},{
width:thiz.state.abWidth,
transform: [ // `transform`是一个有序数组(动画按顺序执行)
{translateX: thiz.state.x},
]
}]} ref="activeBottom">
</Animated.View>
</ScrollView>
</View>
);
}
}