HarmonyOS 关于Grid组件拖拽排序的问题

在Grid组件中实现拖动排序功能，使用拖动方法onItemDragMove时，如何根据拖动的GridItem位置超过要放置GridItem的50%时（左右/上下），自动向前滑动其他GridItem，并把当前要拖动的GridItem放置在正确位置。
HarmonyOS
Heiang
2024-10-08 11:00:06
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回答 2
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superinsect
import {curves,Curves} from '@ohos.curves';  
// xxx.ets  
@Entry  
@Component  
struct GridItemExample {  
  @State numbers: number[] = []  
  @State dragItem: number = -1  
  @State scaleItem: number = -1  
  @State item: number = -1  
  private dragRefOffsetx: number = 0  
  private dragRefOffsety: number = 0  
  @State offsetX: number = 0  
  @State offsetY: number = 0  
  private FIX_VP_X: number = 108  
  private FIX_VP_Y: number = 120  
  aboutToAppear() {  
    for (let i = 1; i <= 11; i++) {  
      this.numbers.push(i)  
    }  
  }  
  itemMove(index: number, newIndex: number): void {  
    let tmp = this.numbers.splice(index, 1)  
    this.numbers.splice(newIndex, 0, tmp[0])  
  }  
  //向下滑  
  down(index: number): void {  
    this.offsetY -= this.FIX_VP_Y  
    this.dragRefOffsety += this.FIX_VP_Y  
    this.itemMove(index, index + 3)  
  }  
  //向下滑(右下角为空)  
  down2(index: number): void {  
    this.offsetY -= this.FIX_VP_Y  
    this.dragRefOffsety += this.FIX_VP_Y  
    this.itemMove(index, index + 3)  
  }  
  //向上滑  
  up(index: number): void {  
    this.offsetY += this.FIX_VP_Y  
    this.dragRefOffsety -= this.FIX_VP_Y  
    this.itemMove(index, index - 3)  
  }  
  //向左滑  
  left(index: number): void {  
    this.offsetX += this.FIX_VP_X  
    this.dragRefOffsetx -= this.FIX_VP_X  
    this.itemMove(index, index - 1)  
  }  
  //向右滑  
  right(index: number): void {  
    this.offsetX -= this.FIX_VP_X  
    this.dragRefOffsetx += this.FIX_VP_X  
    this.itemMove(index, index + 1)  
  }  
  //向右下滑  
  lowerRight(index: number): void {  
    this.offsetX -= this.FIX_VP_X  
    this.dragRefOffsetx += this.FIX_VP_X  
    this.offsetY -= this.FIX_VP_Y  
    this.dragRefOffsety += this.FIX_VP_Y  
    this.itemMove(index, index + 4)  
  }  
  //向右上滑  
  upperRight(index: number): void {  
    this.offsetX -= this.FIX_VP_X  
    this.dragRefOffsetx += this.FIX_VP_X  
    this.offsetY += this.FIX_VP_Y  
    this.dragRefOffsety -= this.FIX_VP_Y  
    this.itemMove(index, index - 2)  
  }  
  //向左下滑  
  lowerLeft(index: number): void {  
    this.offsetX += this.FIX_VP_X  
    this.dragRefOffsetx -= this.FIX_VP_X  
    this.offsetY -= this.FIX_VP_Y  
    this.dragRefOffsety += this.FIX_VP_Y  
    this.itemMove(index, index + 2)  
  }  
  //向左上滑  
  upperLeft(index: number): void {  
    this.offsetX += this.FIX_VP_X  
    this.dragRefOffsetx -= this.FIX_VP_X  
    this.offsetY += this.FIX_VP_Y  
    this.dragRefOffsety -= this.FIX_VP_Y  
    this.itemMove(index, index - 4)  
  }  
  build() {  
    Column() {  
      Grid() {  
        ForEach(this.numbers, (item: number) => {  
          GridItem() {  
            Text(item + '')  
              .fontSize(16)  
              .width('100%')  
              .textAlign(TextAlign.Center)  
              .height(100)  
              .borderRadius(10)  
              .backgroundColor(0xFFFFFF)  
              .shadow(this.scaleItem == item ? { radius: 70, color: '#15000000', offsetX: 0, offsetY: 0 } :  
                { radius: 0, color: '#15000000', offsetX: 0, offsetY: 0 })  
              .animation({ curve: Curve.Sharp, duration: 300 })  
          }  
          .scale({ x: this.scaleItem == item ? 1.05 : 1, y: this.scaleItem == item ? 1.05 : 1 })  
          .zIndex(this.dragItem == item ? 1 : 0)  
          .translate(this.dragItem == item ? { x: this.offsetX, y: this.offsetY } : { x: 0, y: 0 })  
          .padding(10)  
          .gesture(  
            // 以下组合手势为顺序识别，当长按手势事件未正常触发时则不会触发拖动手势事件  
            GestureGroup(GestureMode.Sequence,  
              LongPressGesture({ repeat: true })  
                .onAction((event?: GestureEvent) => {  
                  animateTo({ curve: Curve.Friction, duration: 300 }, () => {  
                    this.scaleItem = item  
                  })  
                })  
                .onActionEnd(() => {  
                  animateTo({ curve: Curve.Friction, duration: 300 }, () => {  
                    this.scaleItem = -1  
                  })  
                }),  
              PanGesture({ fingers: 1, direction: null, distance: 0 })  
                .onActionStart(() => {  
                  this.dragItem = item  
                  this.dragRefOffsetx = 0  
                  this.dragRefOffsety = 0  
                })  
                .onActionUpdate((event: GestureEvent) => {  
                  this.offsetY = event.offsetY - this.dragRefOffsety  
                  this.offsetX = event.offsetX - this.dragRefOffsetx  
                  console.log('X:' + this.offsetX.toString())  
                  // console.log('Y:' + this.offsetY.toString())  
                  animateTo({ curve: curves.interpolatingSpring(0, 1, 400, 38) }, () => {  
                    let index = this.numbers.indexOf(this.dragItem)  
                    if (this.offsetY >= this.FIX_VP_Y / 2 && (this.offsetX <= 44 && this.offsetX >= -44)  
                      && ![8, 9, 10].includes(index)) {  
                      //向下滑  
                      this.down(index)  
                    } else if (this.offsetY <= -this.FIX_VP_Y / 2 && (this.offsetX <= 44 && this.offsetX >= -44)  
                      && ![0, 1, 2].includes(index)) {  
                      //向上滑  
                      this.up(index)  
                    } else if (this.offsetX >= this.FIX_VP_X / 2 && (this.offsetY <= 50 && this.offsetY >= -50)  
                      && ![2, 5, 8, 10].includes(index)) {  
                      //向右滑  
                      this.right(index)  
                    } else if (this.offsetX <= -this.FIX_VP_X / 2 && (this.offsetY <= 50 && this.offsetY >= -50)  
                      && ![0, 3, 6, 9].includes(index)) {  
                      //向左滑  
                      this.left(index)  
                    } else if (this.offsetX >= this.FIX_VP_X / 2 && this.offsetY >= this.FIX_VP_Y / 2  
                      && ![2, 5, 7, 8, 9, 10].includes(index)) {  
                      //向右下滑  
                      this.lowerRight(index)  
                    } else if (this.offsetX >= this.FIX_VP_X / 2 && this.offsetY <= -this.FIX_VP_Y / 2  
                      && ![0, 1, 2, 5, 8].includes(index)) {  
                      //向右上滑  
                      this.upperRight(index)  
                    } else if (this.offsetX <= -this.FIX_VP_X / 2 && this.offsetY >= this.FIX_VP_Y / 2  
                      && ![0, 3, 6, 9, 10].includes(index)) {  
                      //向左下滑  
                      this.lowerLeft(index)  
                    } else if (this.offsetX <= -this.FIX_VP_X / 2 && this.offsetY <= -this.FIX_VP_Y / 2  
                      && ![0, 1, 2, 3, 6, 9].includes(index)) {  
                      //向左上滑  
                      this.upperLeft(index)  
                    } else if (this.offsetX >= this.FIX_VP_X / 2 && this.offsetY >= this.FIX_VP_Y / 2  
                      && [7].includes(index)) {  
                      //向右下滑(右下角为空)  
                      this.down2(index)  
                    }  
                  })  
                })  
                .onActionEnd(() => {  
                  animateTo({ curve: curves.interpolatingSpring(0, 1, 400, 38) }, () => {  
                    this.dragItem = -1  
                  })  
                  animateTo({  
                    curve: curves.interpolatingSpring(14, 1, 170, 17), delay: 150  
                  }, () => {  
                    this.scaleItem = -1  
                  })  
                })  
            )  
              .onCancel(() => {  
                animateTo({ curve: curves.interpolatingSpring(0, 1, 400, 38) }, () => {  
                  this.dragItem = -1  
                })  
                animateTo({  
                  curve: curves.interpolatingSpring(14, 1, 170, 17)  
                }, () => {  
                  this.scaleItem = -1  
                })  
              })  
          )  
        }, (item: number) => item.toString())  
      }  
      .width('90%')  
      .editMode(true)  
      .scrollBar(BarState.Off)  
      .columnsTemplate("1fr 1fr 1fr")  
    }.width('100%').height('100%').backgroundColor('#0D182431').padding({ top: 5 })  
  }  
}
FIX_VP_X，FIX_VP_Y是指需要每个item移动需要修正的x。