HarmonyOS 鸿蒙Next waterFlow无法像GridItem设置item占一行

import {WaterFlowDataSource} from './WaterFlowDataSource'
@Entry
@Component
struct WaterFlowDemo {
  @State minSize: number = 80
  @State maxSize: number = 180
  @State fontSize: number = 24
  @State colors: number[] = [0xFFC0CB, 0xDA70D6, 0x6B8E23, 0x6A5ACD, 0x00FFFF, 0x00FF7F]
  scroller: Scroller = new Scroller()
  datasource: WaterFlowDataSource = new WaterFlowDataSource()
  private itemWidthArray: number[] = []
  private itemHeightArray: number[] = []
// 计算flow item宽/高
getSize() {
let ret = Math.floor(Math.random() * this.maxSize)
return (ret > this.minSize ? ret : this.minSize)
}
// 保存flow item宽/高
getItemSizeArray() {
for (let i = 0; i < 1000; i++) {
this.itemWidthArray.push(this.getSize())
this.itemHeightArray.push(this.getSize())
}
}
aboutToAppear() {
this.getItemSizeArray()
}
@Builder
itemFoot() {
Column() {
Text(Footer)
.fontSize(10)
.backgroundColor(Color.Red)
.width(50)
.height(50)
.align(Alignment.Center)
.margin({ top: 2 })
}
}
build() {
Column({ space: 2 }) {
WaterFlow() {
LazyForEach(this.datasource, (item: number, index: number) => {
FlowItem() {
Column() {
if(this.itemWidthArray[index] > 100){
Grid() {
GridItem() {
Text(“N” + item)
.fontSize(16)
.width(‘100%’)
.height(‘100%’)
.textAlign(TextAlign.Center)
}.columnStart(1).columnEnd(2)
}
}else{
Grid() {
GridItem() {
Text(“N” + item)
.fontSize(16)
.width(‘100%’)
.height(‘100%’)
.textAlign(TextAlign.Center)
.borderStyle(BorderStyle.Dashed).borderWidth(5).borderColor(Color.Red).borderRadius(10)
}
GridItem() {
Text(“N1” + item)
.fontSize(16)
.width(‘100%’)
.height(‘100%’)
.textAlign(TextAlign.Center)
.borderStyle(BorderStyle.Dashed).borderWidth(5).borderColor(Color.Green).borderRadius(10)
}
}
.columnsTemplate(‘1fr 1fr’)
}
}
}
.onAppear(() => {
// 即将触底时提前增加数据
if (item + 20 == this.datasource.totalCount()) {
for (let i = 0; i < 100; i++) {
this.datasource.AddLastItem()
}
}
})
.width(‘100%’)
.height(this.itemHeightArray[item % 100])
.backgroundColor(this.colors[item % 5])
}, (item: string) => item)
}
.columnsTemplate(“1fr”)
.columnsGap(10)
.rowsGap(5)
.backgroundColor(0xFAEEE0)
.width(‘100%’)
.height(‘100%’)
}
}
}
export class WaterFlowDataSource implements IDataSource {
private dataArray: number[] = []
private listeners: DataChangeListener[] = []
constructor() {
for (let i = 0; i < 1000; i++) {
this.dataArray.push(i)
}
}
// 获取索引对应的数据
public getData(index: number): number {
return this.dataArray[index]
}
// 通知控制器数据重新加载
notifyDataReload(): void {
this.listeners.forEach(listener => {
listener.onDataReloaded()
})
}
// 通知控制器数据增加
notifyDataAdd(index: number): void {
this.listeners.forEach(listener => {
listener.onDataAdd(index)
})
}
// 通知控制器数据变化
notifyDataChange(index: number): void {
this.listeners.forEach(listener => {
listener.onDataChange(index)
})
}
// 通知控制器数据删除
notifyDataDelete(index: number): void {
this.listeners.forEach(listener => {
listener.onDataDelete(index)
})
}
// 通知控制器数据位置变化
notifyDataMove(from: number, to: number): void {
this.listeners.forEach(listener => {
listener.onDataMove(from, to)
})
}
// 获取数据总数
public totalCount(): number {
return this.dataArray.length
}
// 注册改变数据的控制器
registerDataChangeListener(listener: DataChangeListener): void {
if (this.listeners.indexOf(listener) < 0) {
this.listeners.push(listener)
}
}
// 注销改变数据的控制器
unregisterDataChangeListener(listener: DataChangeListener): void {
const pos = this.listeners.indexOf(listener)
if (pos >= 0) {
this.listeners.splice(pos, 1)
}
}
// 增加数据
public Add1stItem(): void {
this.dataArray.splice(0, 0, this.dataArray.length)
this.notifyDataAdd(0)
}
// 在数据尾部增加一个元素
public AddLastItem(): void {
this.dataArray.splice(this.dataArray.length, 0, this.dataArray.length)
this.notifyDataAdd(this.dataArray.length - 1)
}
// 在指定索引位置增加一个元素
public AddItem(index: number): void {
this.dataArray.splice(index, 0, this.dataArray.length)
this.notifyDataAdd(index)
}
// 删除第一个元素
public Delete1stItem(): void {
this.dataArray.splice(0, 1)
this.notifyDataDelete(0)
}
// 删除第二个元素
public Delete2ndItem(): void {
this.dataArray.splice(1, 1)
this.notifyDataDelete(1)
}
// 删除最后一个元素
public DeleteLastItem(): void {
this.dataArray.splice(-1, 1)
this.notifyDataDelete(this.dataArray.length)
}
// 重新加载数据
public Reload(): void {
this.dataArray.splice(1, 1)
this.dataArray.splice(3, 2)
this.notifyDataReload()
}
}