HarmonyOS 实现手账、便签的功能

//Editor.ets  
import TestDragText from './TestDragText';  
interface ItemProperty {  
  type: string;  
}  
@Entry  
@Component  
struct EditTab {  
  @State components: Array<ItemProperty> = [];  
  @Builder builderComponent(type: string) {  
    Column() {  
      if (type === 'DragText') {  
        TestDragText();  
      }  
    }.width("100%")  
    .justifyContent(FlexAlign.Center).alignItems(HorizontalAlign.Center)  
  }  
  build() {  
    Column() {  
      Row() {  
        Button('添加拖拽组件').onClick(() => {  
          this.components.push({type: 'DragText'})  
        })  
      }  
      Scroll() {  
        Column({ }) {  
          Column() {  
            ForEach(this.components, (item: (ItemProperty)) => {  
              this.builderComponent(item.type);  
            })  
          }  
          .width("")  
          .alignItems(HorizontalAlign.Start)  
        }  
      }.scrollBarWidth(0)  
      .height('80%')  
    }  
  }  
}  
//TestDragText:  
@Component  
export default struct TestDragText {  
  @State offsetX: number = 0;  
  @State offsetY: number = 0;  
  @State positionX: number = 0;  
  @State positionY: number = 0;  
  
  build() {  
    Column() {  
      Text('PanGesture Offset:\nX: ' + this.offsetX + '\n' + 'Y: ' + this.offsetY)  
        .fontSize(28)  
        .height(200)  
        .width(300)  
        .padding(20)  
        .border({ width: 3 })  
          // 在组件上绑定布局位置信息  
        .translate({ x: this.offsetX, y: this.offsetY, z: 0 })  
        .gesture(  
          // 绑定拖动手势  
          PanGesture()  
            .onActionStart((event: GestureEvent|undefined) => {  
              console.info('Pan start');  
            })  
              // 当触发拖动手势时，根据回调函数修改组件的布局位置信息  
            .onActionUpdate((event: GestureEvent|undefined) => {  
              if(event){  
                this.offsetX = this.positionX + event.offsetX;  
                this.offsetY = this.positionY + event.offsetY;  
              }  
            })  
            .onActionEnd(() => {  
              this.positionX = this.offsetX;  
              this.positionY = this.offsetY;  
            })  
        )  
    }  
    .height(200)  
    .width(250)  
  }  
}