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import React, { Component } from 'react';
import {
View, Text, StyleSheet, Animated, PixelRatio, Dimensions,
} from 'react-native';
function getUIPt(px) {
const { width } = Dimensions.get('window');
return PixelRatio.roundToNearestPixel((px * width) / 750);
}
export default class TestPage9 extends Component {
scrollY = new Animated.Value(0)
constructor(props) {
super(props);
this.state = {
list: null,
topIndexList: [],
pageNum: 0,
isLoading: false,
};
}
timer1=null
getTempList= (from) => {
const { list, topIndexList, pageNum } = this.state;
console.log("getTempList", from, list, topIndexList, pageNum);
if (this.timer1) {
clearTimeout(this.timer1);
}
this.setState({ isLoading: true });
this.timer1 = setTimeout(() => {
if (!list) {
topIndexList.push(0);
this.setState({
list: [{ title: `0我是一个准备置顶的`, stickable: true }, ...this.randomDate()],
topIndexList,
pageNum: pageNum + 1,
isLoading: false,
});
} else if (list && pageNum < 5) {
topIndexList.push(list.length);
list.push({ title: `${list.length}我是一个准备置顶的`, stickable: true });
list.push(...this.randomDate());
this.setState({
list, topIndexList, pageNum: pageNum + 1, isLoading: false,
});
} else {
this.setState({ isLoading: false });
}
}, 300);
}
randomDate() {
const tempDate = parseInt(Math.random() * 80, 10) + 1;
const arr = [];
for (let index = 0; index < tempDate; index++) {
arr.push({ title: `我是一个普通的列表数据¥${index}`, stickable: false });
}
return arr;
}
renderItem = ({ item, index }) => {
const { stickable, title } = item;
if (stickable) {
return (
<View>
<Text style={styles.stickableTitle}>{title}</Text>
</View>
);
}
return (
<View>
<Text style={styles.originTitle}>{title}</Text>
</View>
);
}
componentDidMount() {
this.getTempList(0);
}
componentWillUnmount() {
if (this.timer1) {
clearTimeout(this.timer1);
}
}
renderFooter = (isLoading, pageNum, dataList) => {
const listLength = dataList.length;
if (listLength <= 3) {
return (
<View style={{ height: (5 - listLength) * getUIPt(100) }} />
);
}
if (isLoading && pageNum > 1) {
return (<Text>加载中…</Text>);
}
return null;
};
render() {
const {
list, topIndexList, pageNum, isLoading,
} = this.state;
return (
<View style={styles.Container}>
<HeaderLayout />
<MyFilter scrollY={this.scrollY} />
{ (!!list && list.length > 0&& (
<Animated.FlatList
contentContainerStyle={styles.FlatListContainer}
data={list}
ListFooterComponent={() => this.renderFooter(isLoading, pageNum, list)}
renderItem={this.renderItem}
keyExtractor={(item, index) => `${index}`}
showsVerticalScrollIndicator={false}
stickyHeaderIndices={topIndexList}
scrollEventThrottle={1}
onEndReached={() => { this.getTempList(1); }}
onEndReachedThreshold={0.3}
onScroll={
Animated.event(
[
{
nativeEvent: {
contentOffset: { y: this.scrollY },
},
},
],
{
useNativeDriver: true,
}
)
}
/>
))}
</View>
);
}
}
class MyFilter extends Component {
render() {
const { scrollY } = this.props;
const translateY = scrollY.interpolate({
inputRange: [0, getUIPt(230), getUIPt(230) + 1],
outputRange: [getUIPt(230), 0, 0],
});
return (
<Animated.View style={[styles.MyFilterContaioner, { transform: [{ translateY }] }]}>
<Text style={styles.MyFilterContaionerLabel}>我是赛选条件，我需要固定</Text>
</Animated.View>
);
}
}
class HeaderLayout extends Component {
render() { return (<Text style={styles.headerLayout}>我是一个很高的头部固定的</Text>); }
}
const styles = StyleSheet.create({
headerLayout: {
position: 'absolute',
backgroundColor: '#FEEBC9',
width: getUIPt(750),
height: getUIPt(230),
lineHeight: getUIPt(230),
textAlign: 'center',
},
FlatListContainer: {
paddingTop: getUIPt(230),
marginTop: getUIPt(80),
paddingBottom: getUIPt(80),
},
Container: {
},
MyFilterContaioner: {
position: 'absolute',
zIndex: 3,
top: 0,
},
MyFilterContaionerLabel: {
lineHeight: getUIPt(80),
height: getUIPt(80),
textAlign: 'center',
backgroundColor: '#70BB66',
color: '#000',
width: getUIPt(750),
},
stickableTitle: {
color: '#fff',
backgroundColor: '#A0BB66',
lineHeight: getUIPt(80),
},
originTitle: {
height: getUIPt(84),
backgroundColor: '#A0BBE7',
color: '#999',
},
});
|
