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June 18, 2017 23:14
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RN ListView - hide first and last in list
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state={ | |
endsOfArray:{first:0,last:4,}, | |
numberOfVisableItems:4, | |
array:[{"id":0,"opacity":1,"name":"Jobe Holly"},{"id":1,"opacity":1,"name":"Bernie Sanders"},{"id":2,"opacity":1,"name":"Al Frankin"},{"id":3,"opacity":1,"name":"Elizabeth Warren"},{"id":4,"opacity":1,"name":"Cory Booker"},{"id":5,"opacity":1,"name":"Sanders"},{"id":6,"opacity":1,"name":"Al"},{"id":7,"opacity":1,"name":"Elizabeth"},{"id":8,"opacity":1,"name":"Booker"}], | |
} | |
_onChangeVisibleRows(visibleRows, changedRows) { | |
let visableItems=_.map(visibleRows.s1, function(active, id) {return { id: id, active: active };}) | |
// console.warn(" visableItems.length: ",visableItems.length); | |
this.setState({endsOfArray:{ | |
// first:visableItems[visableItems.length-1].id, | |
// last:visableItems[0].id | |
first:visableItems[visableItems.length-2].id, | |
last:visableItems[1].id | |
}}) | |
// const first=visableItems[visableItems.length-1].id | |
// const last=visableItems[0].id | |
const {array}=this.state | |
const {first,last}=this.state.endsOfArray | |
array.map((o) => { | |
if( last < o.id && o.id < first){if(this._refs[o.id])this._refs[o.id].transitionTo({opacity: 1})} | |
else{if(this._refs[o.id])this._refs[o.id].transitionTo({opacity: 0})} | |
}) | |
} | |
renderRow(o,i) {return <Animatable.View style={{width:width/4,height:width/4,borderRadius:(width/4)/2, opacity: 1,}} ref={_ref=>{this._refs[o.id]=_ref}} key={`item${o.id}`}><TouchableOpacity onPress={o=>console.warn(o.id)} style={{height:150,backgroundColor:"red", justifyContent:"center",alignItems:"center"}} key={`sectionlist-item-${i}`}><Text style={{color:'rgba(0,0,0,0.5)',fontSize: 20,textAlign: "center",margin: 10,}}>{o.name}</Text></TouchableOpacity></Animatable.View>} | |
<ListView style={{flex: 1,width,height}} | |
onChangeVisibleRows={this._onChangeVisibleRows.bind(this)} | |
//renderScrollComponent={this._renderScrollComponent} | |
//scrollRenderAheadDistance={this._scrollRenderAheadDistance} | |
//dataSource={ds.cloneWithRows(this.state.array)} renderRow={(o,i)=><Animatable.View style={{opacity: 1,}} ref={`item${o.id}`}><TouchableOpacity onPress={o=>console.warn(o.id)} style={{height:150,backgroundColor:"red", justifyContent:"center",alignItems:"center"}} key={`sectionlist-item-${i}`}><Text style={{color:'rgba(0,0,0,0.5)',fontSize: 20,textAlign: "center",margin: 10,}}>{o.name}</Text></TouchableOpacity></Animatable.View>}/> | |
dataSource={ds.cloneWithRows(this.state.array)} renderRow={this.renderRow.bind(this)}/> |
Author
garrettmac
commented
Jun 18, 2017
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