鸿蒙中左右拖动

import { curves, display, mediaquery, window } from '@kit.ArkUI';
import { UIAbility } from '@kit.AbilityKit';

// import {HotPushType} from '../../../viewmodel/HotPushItemModel'
export default class GlobalContext extends AppStorage {
  static mainWin: window.Window | undefined = undefined;
  static mainWindowSize: window.Size | undefined = undefined;
}

/**
 * 窗口、屏幕相关信息管理类
 */
export class WindowManager {
  private static instance: WindowManager | null = null;
  private displayInfo: display.Display | null = null;
  private orientationListener = mediaquery.matchMediaSync('(orientation: landscape)');

  constructor() {
    this.orientationListener.on('change', (mediaQueryResult: mediaquery.MediaQueryResult) => {
      this.onPortrait(mediaQueryResult)
    })
    this.loadDisplayInfo()
  }

  static getInstance(): WindowManager {
    if (WindowManager.instance == null) {
      WindowManager.instance = new WindowManager();
    }
    return WindowManager.instance
  }

  /**
   * 设置主window窗口
   * @param win 当前app窗口
   */
  setMainWin(win: window.Window) {
    if (win == null) {
      return
    }
    GlobalContext.mainWin = win;
    win.on("windowSizeChange", (data: window.Size) => {
      if (GlobalContext.mainWindowSize == undefined || GlobalContext.mainWindowSize == null) {
        GlobalContext.mainWindowSize = data;
      } else {
        if (GlobalContext.mainWindowSize.width == data.width && GlobalContext.mainWindowSize.height == data.height) {
          return
        }
        GlobalContext.mainWindowSize = data;
      }

      let winWidth = this.getMainWindowWidth();
      AppStorage.setOrCreate('mainWinWidth', winWidth)
      let winHeight = this.getMainWindowHeight();
      AppStorage.setOrCreate('mainWinHeight', winHeight)
      let context: UIAbility = new UIAbility()
      context.context.eventHub.emit("windowSizeChange", winWidth, winHeight)
    })
  }

  /**
   * 切换屏幕方向
   * @param ori 常量枚举值：window.Orientation
   */
  changeOrientation(ori: window.Orientation) {
    if (GlobalContext.mainWin != null) {
      GlobalContext.mainWin.setPreferredOrientation(ori)
    }
  }

  /**
   * 获取main窗口宽度，单位vp
   */
  getMainWindowWidth(): number {
    return GlobalContext.mainWindowSize != null ? px2vp(GlobalContext.mainWindowSize.width) : 0
  }

  /**
   * 获取main窗口高度，单位vp
   */
  getMainWindowHeight(): number {
    return GlobalContext.mainWindowSize != null ? px2vp(GlobalContext.mainWindowSize.height) : 0
  }

  /**
   * 获取屏幕宽度，单位vp
   */
  getDisplayWidth(): number {
    return this.displayInfo != null ? px2vp(this.displayInfo.width) : 0
  }

  /**
   * 获取屏幕高度，单位vp
   */
  getDisplayHeight(): number {
    return this.displayInfo != null ? px2vp(this.displayInfo.height) : 0
  }

  /**
   * 释放资源
   */
  release() {
    if (this.orientationListener) {
      this.orientationListener.off('change', (mediaQueryResult: mediaquery.MediaQueryResult) => {
        this.onPortrait(mediaQueryResult)
      })
    }
    if (GlobalContext.mainWin != null) {
      GlobalContext.mainWin.off('windowSizeChange')
    }
    WindowManager.instance = null;
  }

  private onPortrait(mediaQueryResult: mediaquery.MediaQueryResult) {
    if (mediaQueryResult.matches == AppStorage.get('isLandscape')) {
      return
    }
    AppStorage.setOrCreate('isLandscape', mediaQueryResult.matches)
    this.loadDisplayInfo()
  }

  private loadDisplayInfo() {
    this.displayInfo = display.getDefaultDisplaySync()
    AppStorage.setOrCreate('displayWidth', this.getDisplayWidth())
    AppStorage.setOrCreate('displayHeight', this.getDisplayHeight())
  }
}

/**
 * 封装任务卡片信息数据类
 */
export class TaskData {
  bgColor: Color | string | Resource = Color.White;
  index: number = 0;
  taskInfo: string = 'music';

  constructor(bgColor: Color | string | Resource, index: number, taskInfo: string) {
    this.bgColor = bgColor;
    this.index = index;
    this.taskInfo = taskInfo;
  }
}




@Entry
@Component
export struct HotPushItem2 {
  displayWidth: number = WindowManager.getInstance().getDisplayWidth();
  scroller: Scroller = new Scroller();
  cardSpace: number = 5; // 卡片间距
  cardWidth: number = this.displayWidth / 2 - this.cardSpace / 2; // 卡片宽度
  cardHeight: number = 190.5; // 卡片高度
  cardPosition: Array = []; // 卡片初始位置
  clickIndex: boolean = false;
  @State taskViewOffsetX: number = 0;
  @State cardOffset: number = this.displayWidth / 4;
  lastCardOffset: number = this.cardOffset;
  startTime: number | undefined = undefined
  private HotPushItem: string[] = ['a',
    'b',
    'c',
    'd',
    'e',
    'f',
    'g',
    'h',
    'i',
    'j',
    'k',
    'l',
    'm',
    'n',
    'o',
    'p',

  ]

  // 每个卡片初始位置
  aboutToAppear() {
    for (let i = 0; i < this.HotPushItem.length; i++) {
      this.cardPosition[i] = i * (this.cardWidth + this.cardSpace);
    }
  }

  // 每个卡片位置
  getProgress(index: number): number {
    let progress =
      (this.cardOffset + this.cardPosition[index] - this.taskViewOffsetX + this.cardWidth / 2) / this.displayWidth;
    return progress
  }

  build() {
    Stack({ alignContent: Alignment.Bottom }) {
      Column()
        .width('100%')
        .height('100%')
        .backgroundColor(Color.Blue)
      Text('111')

      // 滑动组件
      Scroll(this.scroller) {
        Row({ space: this.cardSpace }) {
          ForEach(this.HotPushItem, (item: string, index) => {
            Column()
            Text(item)
              .width(this.cardWidth)
              .height(this.cardHeight)// .backgroundColor(item.bgColor)
              .borderStyle(BorderStyle.Solid)
              .borderWidth(1)
              .borderColor(0xAFEEEE)
              .borderRadius(15)// 计算子组件的仿射属性
              .scale((this.getProgress(index) >= 0.4 && this.getProgress(index) <= 0.6) ?
                {
                  x: 1.5 - Math.abs(0.5 - this.getProgress(index)),
                  y: 1.5 - Math.abs(0.5 - this.getProgress(index))
                } :
                { x: 1, y: 1 })
              .animation({ curve: Curve.Smooth })// 滑动动画
              .translate({ x: this.cardOffset })
              .animation({ curve: curves.springMotion() })
              .zIndex((this.getProgress(index) >= 0.4 && this.getProgress(index) <= 0.6) ? 5 : 1)
          }, (item: TaskData) => item.toString())
        }
        .width((this.cardWidth + this.cardSpace) * (this.HotPushItem.length + 1))
        .height('100%')
      }
      .gesture(
        GestureGroup(GestureMode.Parallel,
          PanGesture({ direction: PanDirection.Horizontal, distance: 5 })
            .onActionStart((event: GestureEvent | undefined) => {
              if (event) {
                this.startTime = event.timestamp;
              }
            })
            .onActionUpdate((event: GestureEvent | undefined) => {
              if (event) {
                this.cardOffset = this.lastCardOffset + event.offsetX;
              }
            })
            .onActionEnd((event: GestureEvent | undefined) => {
              if (event) {
                let time = 0
                if (this.startTime) {
                  time = event.timestamp - this.startTime;
                }
                let speed = event.offsetX / (time / 1000000000);
                let moveX = Math.pow(speed, 2) / 7000 * (speed > 0 ? 1 : -1);

                this.cardOffset += moveX;
                // 左滑大于最右侧位置
                let cardOffsetMax = -(this.HotPushItem.length - 1) * (this.displayWidth / 2);
                if (this.cardOffset < cardOffsetMax) {
                  this.cardOffset = cardOffsetMax;
                }
                // 右滑大于最左侧位置
                if (this.cardOffset > this.displayWidth / 4) {
                  this.cardOffset = this.displayWidth / 4;
                }

                // 左右滑动距离不满足/满足切换关系时，补位/退回
                let remainMargin = this.cardOffset % (this.displayWidth / 2);
                if (remainMargin < 0) {
                  remainMargin = this.cardOffset % (this.displayWidth / 2) + this.displayWidth / 2;
                }
                if (remainMargin <= this.displayWidth / 4) {
                  this.cardOffset += this.displayWidth / 4 - remainMargin;
                } else {
                  this.cardOffset -= this.displayWidth / 4 - (this.displayWidth / 2 - remainMargin);
                }

                // 记录本次滑动偏移量
                this.lastCardOffset = this.cardOffset;
              }
            })
        ), GestureMask.IgnoreInternal)
      .scrollable(ScrollDirection.Horizontal)
      .scrollBar(BarState.Off)

      // 滑动到首尾位置
      Button('Move to first/last')
        .backgroundColor(0x888888)
        .margin({ bottom: 30 })
        .onClick(() => {
          this.clickIndex = !this.clickIndex;

          if (this.clickIndex) {
            this.cardOffset = this.displayWidth / 4;
          } else {
            this.cardOffset = this.displayWidth / 4 - (this.HotPushItem.length - 1) * this.displayWidth / 2;
          }
          this.lastCardOffset = this.cardOffset;
        })
    }
    .width('100%')
    .height('100%')
  }
}