HarmonyOS 可移动GridItem的Grid组件

import curves from '@ohos.curves';  
@Entry  
@Component  
struct grid {  
  @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() {  
      // Button('123456')  
      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, 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 })  
  }  
}