按下按钮(ButtonComponent)后,按钮的状态会改变。现在我将该状态传递给
我刚刚了解到这个extraData属性,但不确定如何在代码中使用它。
这不是什么新鲜事,而是像简单的复选框实现。 一切都运行良好,但当我按下“全选”按钮时,所有剩余的选择按钮没有被切换为选定状态。
<FlatList>
中的<FlatListItem>
(一个子组件)。根据该状态,<FlatList>
中的每个项目都应重新排列。我刚刚了解到这个extraData属性,但不确定如何在代码中使用它。
这不是什么新鲜事,而是像简单的复选框实现。 一切都运行良好,但当我按下“全选”按钮时,所有剩余的选择按钮没有被切换为选定状态。
class FlatListItem extends Component{
constructor(props){
super(props)
const{ isSelected }=this.props
this.state={
selectedStatus:isSelected,
}
}
changeSelectStatus=(key)=>{
this.setState({selectedStatus:!this.state.selectedStatus});
return key;
}
render(){
return(
<View style={{flex:1,
flexDirection:'row',
backgroundColor:'white'}}>
<View>
<Image
source={{uri:this.props.item.imageUri}}
style={{width:50, height:50, margin:5}}>
</Image>
</View>
<View>
<Text style={{color:'black', padding:10, fontSize:16}}>{this.props.item.name}</Text>
</View>
<View style={{flex:1, alignItems:'flex-end', paddingRight:-10}}>
{this.state.selectedStatus?
**<ButtonComponent buttonColor={"black"} buttonTextColor={"white"} fullRounded={true}
borderHighlight={true} buttonWidth={70} buttonHeight={30}
onPress={()=>this.props.showSelected(this.changeSelectStatus(this.props.item.key)) }>
Selected
</ButtonComponent>
:
<ButtonComponent buttonColor={"white"} buttonTextColor={"black"} fullRounded={true}
borderHighlight={true} buttonWidth={70} buttonHeight={30}
onPress={()=>this.props.showSelected(this.changeSelectStatus(this.props.item.key)) }>
Select
</ButtonComponent>
}
</View>
</View>
)
}
}
export default class SelectMembersBody extends Component {
constructor(props){
super(props)
this.state={
selectedButtons:[],
selectAllBtnStatus:false,
}
}
selectAllMembers=()=>{
let allMembers=[];
if(!this.state.selectAllBtnStatus){
membersData.forEach(element => {
if(!this.state.selectedButtons.includes(element.key))
allMembers.push(element.key)
});
this.setState({
selectAllBtnStatus:!this.state.selectAllBtnStatus,
selectedButtons:[...this.state.selectedButtons, allMembers]
})
}
else{
this.setState({
selectAllBtnStatus:!this.state.selectAllBtnStatus,
selectedButtons:[...allMembers]
})
}
}
showSelected=(callback)=>{
let val = callback;
if(!this.state.selectedButtons.includes(val))
this.setState({selectedButtons:[...this.state.selectedButtons, val]});
else{
let newMarkers=[...this.state.selectedButtons]
let index = newMarkers.indexOf(val);
if (index >= 0) {
newMarkers.splice( index, 1 );
}
this.setState({selectedButtons:newMarkers});
}
}
render(){
return(
<View style={{flex:1, }}>
<Text>{this.state.selectedButtons}</Text>
<View>
{this.state.selectAllBtnStatus?
<ButtonComponent buttonColor={"black"} buttonTextColor={"white"} fullRounded={true}
borderHighlight={true} buttonWidth={85} buttonHeight={30} onPress={this.selectAllMembers}>
Selected All
</ButtonComponent>
:
<ButtonComponent buttonColor={"white"} buttonTextColor={"black"} fullRounded={true}
borderHighlight={true} buttonWidth={85} buttonHeight={30} onPress={this.selectAllMembers}>
Select All
</ButtonComponent> }
</View>
<FlatList data={membersData} extraData={this.state}
renderItem={({item, index})=>{
return(
<View>
<FlatListItem item={item} index={index} isSelected={this.state.selectAllBtnStatus} showSelected={this.showSelected} ></FlatListItem>
</View>
)
}
}></FlatList>
</View>
)
}
}