HarmonyOS属性动画开发示例（ArkTS） 原创

├──entry/src/main/ets                // 代码区
│  ├──common
│  │  └──constants
│  │     └──Const.ets                // 常量类
│  ├──entryability
│  │  └──EntryAbility.ts             // 程序入口类
│  ├──pages
│  │  └──Index.ets                   // 动效页面入口
│  ├──view
│  │  ├──AnimationWidgets.ets        // 动画组件
│  │  ├──CountController.ets         // 图标数量控制组件
│  │  └──IconAnimation.ets           // 图标属性动画组件
│  └──viewmodel
│     ├──IconItem.ets                // 图标类
│     ├──Point.ets                   // 图标坐标类
│     └──IconsModel.ets              // 图标数据模型
└──entry/src/main/resources          // 资源文件

// Index.ets
@Entry
@Component
struct Index {
  @State quantity: number = Common.IMAGES_MIN;
  @Provide iconModel: IconsModel = new IconsModel(this.quantity, Common.OFFSET_RADIUS);

  build() {
    Column() {
      // 动画组件
      AnimationWidgets({
        quantity: $quantity
      })
      // 图标数量控制组件
      CountController({
        quantity: $quantity
      })
    }
    ...
  }
}

// CountController.ets
@Component
export struct CountController {
  @Link quantity: number;

  build() {
    Column() {
      Row() {
        Text($r('app.string.count'))
          .textStyle()

        Text(this.quantity)
          .textStyle()
      }
      ...

      Slider({
        value: this.quantity,
        min: Common.IMAGES_MIN,
        max: Common.IMAGES_TOTAL,
        step: 1,
        style: SliderStyle.InSet
      })
        .blockColor(Color.White)
        .selectedColor($r('app.color.SliderSelectColor'))
        .showSteps(true)
        .trackThickness($r('app.float.size_20'))
        .onChange((value: number) => {
          this.quantity = value;
        })
        ...
    }
  }
}

// AnimationWidgets.ets
export struct AnimationWidgets {
  @State mainFlag: boolean = false;
  @Link @Watch('onQuantityChange') quantity: number;
  @Consume iconModel: IconsModel;

  onQuantityChange() { // 监听图标数量的变化，并修改图标数据以及对应的坐标位置
    this.iconModel.addImage(this.quantity);
  }

  aboutToAppear() {
    this.onQuantityChange();
  }

  animate() {
    animateTo(
      {
        delay: Common.DELAY_10,
        tempo: Common.TEMPO,
        iterations: 1,
        duration: Common.DURATION_500,
        curve: Curve.Smooth,
        playMode: PlayMode.Normal
      }, () => {
      this.mainFlag = !this.mainFlag;
    })
  }

  build() {
    Stack() {
      Stack() {
        ForEach(this.iconModel.imagerArr, (item: IconItem) => {
          IconAnimation({
            item: item,
            mainFlag: $mainFlag
          })
        }, (item: IconItem) => JSON.stringify(item.index))
      }
      .rotate({
        x: 0,
        y: 0,
        z: 1,
        angle: this.mainFlag ? Common.ROTATE_ANGLE_360 : 0
      })

      ...

      Image(
        this.mainFlag
          ? $r("app.media.imgActive")
          : $r("app.media.imgInit")
      )
        .scale({
          x: this.mainFlag ? Common.INIT_SCALE : 1,
          y: this.mainFlag ? Common.INIT_SCALE : 1
        })
        .onClick(() => {
          this.iconModel.reset(); //  重置图标激活状态
          this.animate(); // 启动显式动画
        })
      ...
    }
  }
}

// IconAnimation.ets
export struct IconAnimation {
  @Link mainFlag: boolean;
  @ObjectLink item: IconItem;

  build() {
    Image(this.item.image)
      .width(Common.ICON_WIDTH)
      .height(Common.ICON_HEIGHT)
      .objectFit(ImageFit.Contain)
      .translate(
        this.mainFlag
          ? { x: this.item.point.x, y: this.item.point.y }
          : { x: 0, y: 0 }
      )
      .rotate({
        x: 0,
        y: 1,
        z: 0,
        angle: this.item.clicked ? Common.ROTATE_ANGLE_360 : 0
      })
      .scale(
        this.item.clicked
          ? { x: Common.SCALE_RATIO, y: Common.SCALE_RATIO }
          : { x: 1, y: 1 }
      )
      .opacity(this.item.clicked ? Common.OPACITY_06 : 1)
      .onClick(() => {
        this.item.clicked = !this.item.clicked;
      })
      .animation(
        {
          delay: Common.DELAY_10,
          duration: Common.DURATION_1000,
          iterations: 1,
          curve: Curve.Smooth,
          playMode: PlayMode.Normal
        }
      )
  }
}

// IconsModel.ets
import Common from '../common/constants/Const';
import IconItem from './IconItem';
import Point from './Point';

const TWO_PI: number = 2 * Math.PI;

@Observed
export class IconsModel {
  public imagerArr: Array<IconItem> = [];
  private num: number = Common.IMAGES_MIN;
  private radius: number;

  constructor(num: number, radius: number) {
    this.radius = radius;
    this.addImage(num);
  }

  public addImage(num: number) {
    this.num = num;
    if (this.imagerArr.length === num) {
      return;
    }
    if (this.imagerArr.length > num) {
      this.imagerArr.splice(num, this.imagerArr.length - num);
    } else {
      for (let i = this.imagerArr.length; i < num; i++) {
        const point = this.genPointByIndex(i);
        this.imagerArr.push(new IconItem(i, Common.IMAGE_RESOURCE[i], false, point));
      }
    }

    this.refreshPoint(num);
  }

  public refreshPoint(num: number) {
    for (let i = 0; i < num; i++) {
      this.imagerArr[i].point = this.genPointByIndex(i);
    }
  }

  public genPointByIndex(index: number): Point {
    const x = this.radius * Math.cos(TWO_PI * index / this.num);
    const y = this.radius * Math.sin(TWO_PI * index / this.num);
    return new Point(x, y);
  }

  public reset() {
    for (let i = 0; i < this.num; i++) {
      if (this.imagerArr[i].clicked) {
        this.imagerArr[i].clicked = false;
      }
    }
  }
}