HarmonyOS NEXT换成model后动画放大实现不了?

Question

HarmonyOS NEXT换成model后动画放大实现不了?

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Answer 1

listitem内容为object，不能直接用 ==判断当前item，可以改用index确定当前点击的item，修改如下：（其他案例参考：https://gitee.com/harmonyos-cases/cases/tree/master/CommonApp...）

import curves from '@ohos.curves'; 
@Entry 
@Component 
struct model { 
  @State private arr: titleStrModel[] = [] 
  @State dragItem: titleStrModel = new titleStrModel() 
  @State scaleItem: titleStrModel = new titleStrModel() 
  @State neighborItem: titleStrModel = new titleStrModel() 
  @State selectedIndex:number = -1 
  @State neighborScale: number = -1 
  private dragRefOffset: number = 0 
  @State offsetX: number = 0 
  @State offsetY: number = 0 
  private ITEM_INTV: number = 120 
  aboutToAppear(): void { 
    const d = new titleStrModel() 
    d.name = 'wewewe' 
    const b = new titleStrModel() 
    b.name = 'adadad' 
    const h = new titleStrModel() 
    h.name = 'dfdfdf' 
    this.arr.push(d) 
    this.arr.push(b) 
    this.arr.push(h) 
  } 
 
  //根据当前index确定item是否缩放 
  scaleSelect(item: titleStrModel):void { 
    this.selectedIndex = this.arr.indexOf(item) 
    this.arr[this.selectedIndex].scale = 1.05 
  } 
  itemMove(index: number, newIndex: number): void { 
    let tmp = this.arr.splice(index, 1) 
    this.arr.splice(newIndex, 0, tmp[0]) 
  } 
  build() { 
    Stack() { 
      List({ space: 20, initialIndex: 0 }) { 
        ForEach(this.arr, (item: titleStrModel) => { 
          ListItem() { 
            Row() { 
              Text('' + item.name) 
                .width('100%') 
                .height(100) 
                .fontSize(16) 
                .textAlign(TextAlign.Center) 
                .borderRadius(10) 
                .backgroundColor(0xFFFFFF) 
              Image($r('app.media.app_icon')) 
                .width(100) 
                .height(100) 
            } 
            .shadow(this.scaleItem.name == item.name ? { radius: 70, color:Color.Blue, offsetX: 0, offsetY: 0 } : 
              { radius: 0, color: Color.Blue, offsetX: 0, offsetY: 0 }) 
            .animation({ curve: Curve.Sharp, duration: 300 }) 
          } 
          .margin({ left: 12, right: 12 }) 
          .scale({ x: item.scale, y: item.scale }) 
          .zIndex(this.dragItem.name == item.name ? 1 : 0) 
          .translate(this.dragItem.name == item.name ? { y: this.offsetY } : { y: 0 }) 
          .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 
                    this.scaleSelect(item) 
                  }) 
                }) 
                .onActionEnd(() => { 
                  animateTo({ curve: Curve.Friction, duration: 300 }, () => { 
                    this.scaleItem = new titleStrModel() 
                  }) 
                }), 
              PanGesture({ fingers: 1, direction: null, distance: 0 }) 
                .onActionStart(() => { 
                  this.dragItem = item 
                  this.dragRefOffset = 0 
                }) 
                .onActionUpdate((event: GestureEvent) => { 
                  this.offsetY = event.offsetY - this.dragRefOffset 
                  // console.log('Y:' + this.offsetY.toString()) 
                  this.neighborItem = new titleStrModel() 
                  let index = this.arr.indexOf(item) 
                  let curveValue = curves.initCurve(Curve.Sharp) 
                  let value: number = 0 
                  //根据位移计算相邻项的缩放 
                  if (this.offsetY < 0) { 
                    value = curveValue.interpolate(-this.offsetY / this.ITEM_INTV) 
                    this.neighborItem = this.arr[index-1] 
                    this.neighborScale = 1 - value / 20; 
                    console.log('neighborScale:' + this.neighborScale.toString()) 
                  } else if (this.offsetY > 0) { 
                    value = curveValue.interpolate(this.offsetY / this.ITEM_INTV) 
                    this.neighborItem = this.arr[index+1] 
                    this.neighborScale = 1 - value / 20; 
                  } 
                  //根据位移交换排序 
                  if (this.offsetY > this.ITEM_INTV / 2) { 
                    animateTo({ curve: curves.interpolatingSpring(0, 1, 400, 38) }, () => { 
                      this.offsetY -= this.ITEM_INTV 
                      this.dragRefOffset += this.ITEM_INTV 
                      this.itemMove(index, index + 1) 
                    }) 
                  } else if (this.offsetY < -this.ITEM_INTV / 2) { 
                    animateTo({ curve: curves.interpolatingSpring(0, 1, 400, 38) }, () => { 
                      this.offsetY += this.ITEM_INTV 
                      this.dragRefOffset -= this.ITEM_INTV 
                      this.itemMove(index, index - 1) 
                    }) 
                  } 
                }) 
                .onActionEnd((event: GestureEvent) => { 
                  animateTo({ curve: curves.interpolatingSpring(0, 1, 400, 38) }, () => { 
                    this.dragItem = new titleStrModel() 
                    this.neighborItem = new titleStrModel() 
                    //动画结束将缩放还原 
                    this.arr[this.arr.indexOf(this.scaleItem)].scale = 1 
                  }) 
                  animateTo({ 
                    curve: curves.interpolatingSpring(14, 1, 170, 17), delay: 150 
                  }, () => { 
                    this.scaleItem = new titleStrModel() 
                  }) 
                }) 
            ) 
              .onCancel(() => { 
                animateTo({ curve: curves.interpolatingSpring(0, 1, 400, 38) }, () => { 
                  this.dragItem = new titleStrModel() 
                  this.neighborItem = new titleStrModel() 
                }) 
                animateTo({ 
                  curve: curves.interpolatingSpring(14, 1, 170, 17), delay: 150 
                }, () => { 
                  this.scaleItem = new titleStrModel() 
                }) 
              }) 
          ) 
        }) 
      } 
    }.width('100%').height('100%').backgroundColor(0xDCDCDC).padding({ top: 5 }) 
  } 
} 
class titleStrModel { 
  name:string = '' 
  scale:number = 1 //增加scale属性, 每个item都有对应的scale值 
}