编辑

import { GridDataSource } from './GridDataSource';
@Entry
@Component
struct GridExample {
  numbers: GridDataSource = new GridDataSource([]);
  scroller: Scroller = new Scroller();
  @State text: string = 'drag';
  @Builder pixelMapBuilder() { //拖拽过程样式
    Column() {
      Text(this.text)
        .fontSize(16)
        .backgroundColor(0xF9CF93)
        .width(80)
        .height(80)
        .textAlign(TextAlign.Center)
    }
  }
  aboutToAppear() {
    let list: string[] = [];
    for (let i = 1; i <= 15; i++) {
      list.push(i + '');
    }
    this.numbers = new GridDataSource(list);
  }
  changeIndex(index1: number, index2: number) { //交换数组位置
    this.numbers.swapItem(index1, index2);
  }
  build() {
    Column({ space: 5 }) {
      Grid(this.scroller) {
        LazyForEach(this.numbers, (day: string) => {
          GridItem() {
            Text(day)
              .fontSize(16)
              .backgroundColor(0xF9CF93)
              .width(80)
              .height(80)
              .textAlign(TextAlign.Center)
          }
        }, (day: string) => day)
      }
      .columnsTemplate('1fr 1fr 1fr')
      .columnsGap(10)
      .rowsGap(10)
      .width('90%')
      .backgroundColor(0xFAEEE0)
      .height(300)
      .editMode(true) //设置Grid是否进入编辑模式，进入编辑模式可以拖拽Grid组件内部GridItem
      .supportAnimation(true) // 设置支持动画
      .onItemDragStart((event: ItemDragInfo, itemIndex: number) => { //第一次拖拽此事件绑定的组件时，触发回调。
        this.text = this.numbers.getData(itemIndex);
        return this.pixelMapBuilder(); //设置拖拽过程中显示的图片。
      })
      .onItemDrop((event: ItemDragInfo, itemIndex: number, insertIndex: number, isSuccess: boolean) => { //绑定此事件的组件可作为拖拽释放目标，当在本组件范围内停止拖拽行为时，触发回调。
        // isSuccess=false时，说明drop的位置在grid外部；insertIndex > length时，说明有新增元素的事件发生
        if (!isSuccess || insertIndex >= this.numbers.totalCount()) {
          return;
        }
        console.info('itemIndex:' + itemIndex + ', insertIndex:' + insertIndex); //itemIndex拖拽起始位置，insertIndex拖拽插入位置
        this.changeIndex(itemIndex, insertIndex);
      })
    }.width('100%').margin({ top: 5 })
  }
}

@Entry
@Component
struct GridPage {
    @State message: string = 'Hello World';
    @State list: Array<string> = []
    @State imageNum: number = 0;

    aboutToAppear(): void {
        for (let i = 0; i < 10; i++) {
            this.list.push("Item" + i)
        }
    }

    @Builder
    pixelMapBuilder() {
        Column() {
            Text(this.list[this.imageNum])
                .fontSize(20)
                .fontColor(Color.Black)
                .fontWeight(FontWeight.Bold)
                .textAlign(TextAlign.Center)
        }
        .width(106)
        .height(73)
        .justifyContent(FlexAlign.Center)
        .backgroundColor("#F1F3F5")
        .zIndex(1)
        .scale({ x: 1.05, y: 1.05 })
        .translate({ x: 0, y: 0 })
        .borderRadius(10)
    }


    // [Start data_exchange_start]
    changeIndex(index1: number, index2: number) {
        let tmp = this.list.splice(index1, 1);
        this.list.splice(index2, 0, tmp[0])
    }
    // [End data_exchange_start]

    build() {
        Column() {
            Grid() {
                ForEach(this.list, (item: string, index: number) => {
                    GridItem() {
                        Column() {
                            Text(item)
                                .fontSize(20)
                                .fontColor(Color.Black)
                                .fontWeight(FontWeight.Bold)
                                .textAlign(TextAlign.Center)
                        }
                        .width("100%")
                        .height(73)
                        .justifyContent(FlexAlign.Center)
                        .borderRadius(10)
                        .backgroundColor("#F1F3F5")
                        .animation({ curve: Curve.Sharp, duration: 300 })

                    }

                }, (item: string, index: number) => item)
            }
            .width("100%")
            //总要，true开启，false不开启
            .editMode(true)
            .scrollBar(BarState.Off)
            .columnsTemplate('1fr 1fr 1fr 1fr')
            .columnsGap(12)
            .rowsGap(12)
            .margin({ top: 5 })
            .onItemDragStart((_, itemIndex: number) => {
                this.list.findIndex((v:String,i:number,obj:string[])=>{
                    if(v == this.list[itemIndex]){
                        this.imageNum = i
                    }
                })
                // this.imageNum = this.list[itemIndex];
                return this.pixelMapBuilder();
            })
            .onItemDrop((_, itemIndex: number, insertIndex: number, isSuccess: boolean) => {
                if (!isSuccess || insertIndex >= this.list.length) {
                    return;
                }
                this.changeIndex(itemIndex, insertIndex);
            })
        }
        .height('100%')
        .width('100%')
    }
}