Navigation实现一镜到底转场 原创

一路向北545
发布于 2024-12-12 18:54
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一、介绍

共享元素转场是一种界面切换时对相同或者相似的两个元素做的一种位置和大小匹配的过渡动画效果,也称一镜到底动效。

利用系统能力,转场前后两个组件调用geometryTransition接口绑定同一id,同时将转场逻辑置于animateTo动画闭包内,这样系统侧会自动为二者添加一镜到底的过渡效果。

系统将调整绑定的两个组件的宽高及位置至相同值,并切换二者的透明度,以实现一镜到底过渡效果。因此,为了实现流畅的动画效果,需要确保对绑定geometryTransition的节点添加宽高动画不会有跳变。此方式适用于创建新节点开销小的场景

效果图如下

Navigation实现一镜到底转场-鸿蒙开发者社区

二、设计思路

我们设计两个页面。PageOne用来显示九宫格图片,PageTwo用来显示大图。

PageOne使用Grid来作为容器,GridItem放置Image组件。

我们找到9张图片放到资源目录中,为Image配置geometryTransition()参数为字符串,作为当前图片的共享元素id。

PageTwo页面我们是哟个Swiper作为容器,其中每个Item我们放置一个可以带缩放功能的Image组件,缩放功能可以找到三方组件替代。此Image也需要配置geometryTransition(),参数与PageOne中对应的图片的id保持一致。

点击PageOne中某一张图片和PageTwo返回上一页面时,我们使用animateTo作为转场动画。

三、逻辑实现

(1)Navigation配置NavPathStack

@Provide('NavPathStack') pageInfos: NavPathStack = new NavPathStack();
Navigation(this.pageInfos) {
    
}

(2)配置路由

resources->base->profile下配置route_map.json文件

{
  "routerMap": [
    {
      "name": "pageTwo",//名称,根据此参数进行跳转
      "pageSourceFile": "src/main/ets/pages/PageTwo.ets",//目标页面路径
      "buildFunction": "PageTwoBuilder"
    }
  ]
}

moudule.json5文件引入路由配置文件

{
  "module": {
      "routerMap": "$profile:route_map"
      }
}

(3)PageOne页面配置转场动画和共享元素,使用状态变量来控制跳转过程中,PageOne被放大的图片显示空白

Grid(this.scroller) {
  ForEach(this.data, (item: Resource, index: number) => {
    GridItem() {
      if (this.clickedIndex !== index || (this.isFirstPageShow)) {
        Image(item)
          .width('100%')
          .height('100%')
          .objectFit(ImageFit.Cover)
          .onClick(() => {
            this.onItemClick(index)
          })
          .geometryTransition('app.media.img_' + JSON.stringify(index % 9))
          .transition(TransitionEffect.opacity(0.99))
      }
    }
    .width(px2vp(381))
    .height(px2vp(381))
  }, (item: number) => item + '')
}
.rowsTemplate('1fr 1fr 1fr')
.columnsTemplate('1fr 1fr 1fr')

onItemClick(index: number) {
  let param: Record<string, Object> = {};
  this.clickedIndex = index;
  param['selectedIndex'] = this.clickedIndex;
  param['bigImageData'] = this.data
  param['onIndexChange'] = (index: number) => {
    this.onIndexChange(index);
  };
  param['onBackToFirstPage'] = () => {
    this.onBack();
  }

  animateTo({
    duration: 250,
    curve: Curve.EaseIn,
  }, () => {
    this.pageInfos.pushPath({ name: 'pageTwo', param: param }, false);
    this.isFirstPageShow = false;
  })
}

(4)PageTwo页面配置共享元素id和返回上一页转场动画

Swiper(this.swiperController) {
  ForEach(this.bigImageData, (item: Resource, index: number) => {
    PhotoItem({
      //配置共享元素id
      imageUrl: 'app.media.img_' + JSON.stringify(index % 9),
      backToFirstPage: this.backToFirstPage
    })
  }, (item: string) => item)
}
private backToFirstPage: () => void = () => {
  animateTo({
    duration: 300,
    curve: Curve.EaseIn,
  }, () => {
    this.onFirstPageShow();
    this.pageInfos.pop(false);
  })
}

四、完整代码实现

Index.ets

@Entry
@Component
struct Index {
  @Provide('NavPathStack') pageInfos: NavPathStack = new NavPathStack();
  build() {
    Navigation(this.pageInfos) {
        Button().onClick(()=>{
          this.pageInfos.pushPath({name:"pageOne"})
        })
    }
    .mode(NavigationMode.Stack)
    .hideBackButton(true)
    .backgroundColor('#F1F3F5')
  }
}

PageOne.ets

@Builder
export function PageOneBuilder() {
  PageOne();
}
@Component
export struct PageOne {
  private pageInfos: NavPathStack = new NavPathStack();
  @State isEnabled: boolean = true;
  @State clickedIndex: number = 0;
  private scroller: Scroller = new Scroller();
  private data: Resource[] =
    [$r("app.media.img_0"), $r("app.media.img_1"), $r("app.media.img_2"), $r("app.media.img_3"), $r("app.media.img_4")
      , $r("app.media.img_5"), $r("app.media.img_6"), $r("app.media.img_7"), $r("app.media.img_8"),
      $r("app.media.img_9")];
  @State isFirstPageShow: boolean = true;
  onIndexChange(index: number): void {
    this.clickedIndex = index;
  }
  onBack(): void {
    this.isFirstPageShow = true;
  }

  onItemClick(index: number) {
    let param: Record<string, Object> = {};
    this.clickedIndex = index;
    param['selectedIndex'] = this.clickedIndex;
    param['bigImageData'] = this.data
    param['onIndexChange'] = (index: number) => {
      this.onIndexChange(index);
    };
    param['onBackToFirstPage'] = () => {
      this.onBack();
    }

    animateTo({
      duration: 250,
      curve: Curve.EaseIn,
    }, () => {
      this.pageInfos.pushPath({ name: 'pageTwo', param: param }, false);
      this.isFirstPageShow = false;
    })
  }

  build() {
    NavDestination() {
      Grid(this.scroller) {
        ForEach(this.data, (item: Resource, index: number) => {
          GridItem() {
            if (this.clickedIndex !== index || (this.isFirstPageShow)) {
              Image(item)
                .width('100%')
                .height('100%')
                .objectFit(ImageFit.Cover)
                .onClick(() => {
                  this.onItemClick(index)
                })
                .geometryTransition('app.media.img_' + JSON.stringify(index % 9))
                .transition(TransitionEffect.opacity(0.99))
            }
          }
          .width(px2vp(381))
          .height(px2vp(381))
        }, (item: number) => item + '')
      }
      .rowsTemplate('1fr 1fr 1fr')
      .columnsTemplate('1fr 1fr 1fr')
      .columnsGap(2)
      .rowsGap(2)
      .size({
        width: px2vp(1169),
        height: px2vp(1169)
      })
      .margin({ top: 16 })
    }.onReady((context: NavDestinationContext) => {
      this.pageInfos = context.pathStack;
    })

  }
}

PageTwo.ets

import { PhotoItem } from "../MyComponent";
import { matrix4 } from "@kit.ArkUI";

@Builder
export function PageTwoBuilder() {
  PageTwo();
}

@Component
export struct PageTwo {
  @State selectedIndex: number = 0;
  @State scaleRatio: number = 1;
  @State positionX: number = 0;
  @State positionY: number = 0;
  @State scaleX: number = 1;
  @State scaleY: number = 1;
  @State translateX: number = 0;
  @State translateY: number = 0;
  @State imageMatrix: matrix4.Matrix4Transit = matrix4.identity();
  private pageInfos: NavPathStack = new NavPathStack();
  private swiperController: SwiperController = new SwiperController();
  @State bigImageData:Resource[] = []
  aboutToAppear(): void {
  }
  private onIndexChange: (index: number) => void = (_index: number) => {
  }
  private backToFirstPage: () => void = () => {
    animateTo({
      duration: 300,
      curve: Curve.EaseIn,
    }, () => {
      this.onFirstPageShow();
      this.pageInfos.pop(false);
    })
  }
  private onFirstPageShow: () => void = () => {};

  private onBack?: () => void;

  build() {
    NavDestination() {
      Swiper(this.swiperController) {
        ForEach(this.bigImageData, (item: Resource, index: number) => {
          PhotoItem({
            //配置共享元素id
            imageUrl: 'app.media.img_' + JSON.stringify(index % 9),
            backToFirstPage: this.backToFirstPage
          })
        }, (item: string) => item)
      }
      .transition(TransitionEffect.opacity(0.99))
      .width('100%')
      .height('100%')
      .clip(false)
      .index(this.selectedIndex)
      .onChange((index: number) => {
        this.selectedIndex = index;
        this.onIndexChange(index);
      })
      .onAnimationStart((_: number, targetIndex: number) => {
        this.onIndexChange(targetIndex);
      })
      .indicator(false)
    }
    .width('100%')
    .height('100%')
    .mode(NavDestinationMode.DIALOG)
    .expandSafeArea([SafeAreaType.SYSTEM])
    .onReady((context: NavDestinationContext) => {
      this.pageInfos = context.pathStack;
      let param = context.pathInfo?.param as Record<string, Object>;
      if (param === undefined) {
        return;
      }
      this.bigImageData = param['bigImageData'] as Resource[]
      this.selectedIndex = param['selectedIndex'] as number;
      this.onIndexChange = param['onIndexChange'] as (index: number) => void;
      this.onFirstPageShow = param['onBackToFirstPage'] as () => void;
    })
    .hideTitleBar(true)
    .onBackPressed(() => {
      this.backToFirstPage();
      return true;
    })
    .transition(TransitionEffect.opacity(0.99))
  }
}

PhotoItem.ets


import { componentUtils, inspector, matrix4 } from '@kit.ArkUI';

enum Status {
  IDLE,
  PINCHING,
  PAN_ONLY,
  READY_TO_BACK
}

@Component
export struct PhotoItem {
  @State status: Status = Status.IDLE;
  @State panDirection: PanDirection = PanDirection.Vertical;
  @State imageScale: number = 1; // scale caused by the zoom gesture.
  @State imagePullingDownScale: number = 1; // Drag gestures to cause scale.
  @State imageTranslateX: number = 0; // px
  @State imageTranslateY: number = 0; // px
  @State centerX: number = 0;
  @State centerY: number = 0;
  // Bound component boundary.
  @State maxOffsetX: number = 0;
  @State minOffsetX: number = 0;
  @State maxOffsetY: number = 0;
  @State minOffsetY: number = 0;
  @State gestureDisabled: boolean = false; // Global disable gesture.
  @State @Watch('onAllGestureFinish') gestureCount: number = 0;
  @State geometryPositionX: number = 0;
  @State geometryPositionY: number = 0;
  @State geometryScale: number = 1;
  private imageUrl: string = '';
  private photoId: string = 'myCat'; // Get picture location
  private photoListener: inspector.ComponentObserver = inspector.createComponentObserver(this.photoId);
  private imagePositionX: number = 0; // The global coordinates before the image transform.
  private imagePositionY: number = 600; // The global coordinates before the image transform.
  private imageWidth: number = 1260; // Image size (px), to be specified.
  private imageHeight: number = 1680;
  private lastCenterX: number = 0;
  private lastCenterY: number = 0;
  // Record the initial state of the gesture. The unit of offset is vp
  private startGestureOffsetX: number = 0;
  private startGestureOffsetY: number = 0;
  private startGestureScale: number = 1;
  // Constrained display boundary.
  private displayLeft: number = 0;
  private displayTop: number = 126;
  private displayRight: number = 1260;
  private displayBottom: number = 2629;
  // The actual display boundary is controlled by both the image boundary and the display boundary.
  private realDisplayBoundsLeft: number = 0;
  private realDisplayBoundsTop: number = 0;
  private realDisplayBoundsRight: number = 0;
  private realDisplayBoundsBottom: number = 0;
  private firstStarted = true; // Avoid entering during page initialization.
  private backToFirstPage: () => void = () => {
  };

  // Get component location.
  init(): void {
    let photoInfo = componentUtils.getRectangleById(this.photoId);
    this.imagePositionX = photoInfo.windowOffset.x;
    this.imagePositionY = photoInfo.windowOffset.y;
  }

  onAllGestureFinish(): void {
    if (this.firstStarted) {
      this.firstStarted = false;
      return;
    }

    if (this.gestureCount !== 0) {
      return;
    }

    if (this.status === Status.IDLE) {
      this.disableGesture();
      animateTo({
        duration: 300,
        onFinish: () => {
          this.updatePanDirection();
          this.resumeGesture();
        }
      }, () => {
        this.imagePullingDownScale = 1;
        let leftTop = this.calculateLeftTopPoint();
        let rightBottom = this.calculateRightBottomPoint();
        let imageWidth = this.imageWidth * this.imageScale;
        if (imageWidth < this.displayRight - this.displayLeft) {
          // If the picture width is less than the width of the display range, center.
          this.centerX = 0;
          this.imageTranslateX = 0;
        } else if (leftTop[0] > this.displayLeft) {
          // Out of display left edge, move back.
          this.imageTranslateX += (this.displayLeft - leftTop[0]);
        } else if (rightBottom[0] < this.displayRight) {
          this.imageTranslateX += (this.displayRight - rightBottom[0]);
        }

        let imageHeight = this.imageHeight * this.imageScale;
        if (imageHeight < this.displayBottom - this.displayTop) {
          this.centerY = 0;
          this.imageTranslateY = 0;
        } else if (leftTop[1] > this.displayTop) {
          this.imageTranslateY += (this.displayTop - leftTop[1]);
        } else if (rightBottom[1] < this.displayBottom) {
          this.imageTranslateY += (this.displayBottom - rightBottom[1]);
        }
      })
    }

    if (this.status === Status.READY_TO_BACK) {
      this.status = Status.IDLE;
      this.disableGesture();
      animateTo({
        duration: 300,
        onFinish: () => {
          this.resumeGesture();
          this.updatePanDirection();
        }
      }, () => {
        let leftTopPoint = this.calculateLeftTopPoint();
        this.geometryPositionX = leftTopPoint[0] - this.imagePositionX;
        this.geometryPositionY = leftTopPoint[1] - this.imagePositionY;
        this.geometryScale = this.imageScale * this.imagePullingDownScale;
        this.resetTransform();
        this.backToFirstPage();
      })
    }
  }

  disableGesture(): void {
    this.gestureDisabled = true;
  }

  resumeGesture(): void {
    this.gestureDisabled = false;
  }

  // Calculate the global coordinates in the upper left corner of the image after the transform.
  calculateLeftTopPoint(): [number, number] {
    let matrix = matrix4.identity()
      .scale({
        x: this.imageScale * this.imagePullingDownScale,
        y: this.imageScale * this.imagePullingDownScale,
        centerX: this.centerX,
        centerY: this.centerY
      })
      .translate({ x: this.imageTranslateX, y: this.imageTranslateY })
    let leftTop = matrix.transformPoint([-this.imageWidth / 2, -this.imageHeight / 2]);
    let leftTopPointX = leftTop[0] + this.imageWidth / 2 + this.imagePositionX;
    let leftTopPointY = leftTop[1] + this.imageHeight / 2 + this.imagePositionY;
    return [leftTopPointX, leftTopPointY];
  }

  // Calculate the global coordinates of the lower right corner after the image transform.
  calculateRightBottomPoint(): [number, number] {
    let matrix = matrix4.identity()
      .scale({
        x: this.imageScale * this.imagePullingDownScale,
        y: this.imageScale * this.imagePullingDownScale,
        centerX: this.centerX,
        centerY: this.centerY
      })
      .translate({
        x: this.imageTranslateX,
        y: this.imageTranslateY
      })
    let rightBottom = matrix.transformPoint([this.imageWidth / 2, this.imageHeight / 2]);
    let rightBottomPointX = rightBottom[0] + this.imageWidth / 2 + this.imagePositionX;
    let rightBottomPointY = rightBottom[1] + this.imageHeight / 2 + this.imagePositionY;
    return [rightBottomPointX, rightBottomPointY];
  }

  // Here you need to enter the coordinates relative to the top left corner of the image.
  updateCenter(gestureCenterPoint: [number, number]) {
    this.lastCenterX = this.centerX;
    this.lastCenterY = this.centerY;
    let matrix = matrix4.identity()
      .scale({
        x: this.imageScale * this.imagePullingDownScale,
        y: this.imageScale * this.imagePullingDownScale,
        centerX: this.lastCenterX,
        centerY: this.lastCenterY
      })
      .translate({
        x: this.imageTranslateX,
        y: this.imageTranslateY
      })
    let leftTop = matrix.transformPoint([-this.imageWidth / 2, -this.imageHeight / 2]); // px
    let leftTopPointX = leftTop[0] + this.imageWidth / 2; // px
    let leftTopPointY = leftTop[1] + this.imageHeight / 2;
    this.centerX = (gestureCenterPoint[0] - leftTopPointX) / this.imageScale - this.imageWidth / 2;
    this.centerY = (gestureCenterPoint[1] - leftTopPointY) / this.imageScale - this.imageHeight / 2;
  }

  // According to the change of center, adjust translate to ensure that the position of the image remains unchanged after the transform.
  updateTranslateAccordingToCenter() {
    if (this.lastCenterX === this.centerX && this.lastCenterY === this.centerY) {
      return;
    }
    let lastTranslateX = this.imageTranslateX;
    let lastTranslateY = this.imageTranslateY;
    let matrixOld = matrix4.identity()
      .scale({
        x: this.imageScale * this.imagePullingDownScale,
        y: this.imageScale * this.imagePullingDownScale,
        centerX: this.lastCenterX,
        centerY: this.lastCenterY
      })
      .translate({ x: lastTranslateX, y: lastTranslateY })
    let matrixNew = matrix4.identity()
      .scale({
        x: this.imageScale * this.imagePullingDownScale,
        y: this.imageScale * this.imagePullingDownScale,
        centerX: this.centerX,
        centerY: this.centerY
      })
      .translate({
        x: this.imageTranslateX,
        y: this.imageTranslateY
      })
    let leftTopOld = matrixOld.transformPoint([-this.imageWidth / 2, -this.imageHeight / 2]);
    let leftTopNew = matrixNew.transformPoint([-this.imageWidth / 2, -this.imageHeight / 2]);
    this.imageTranslateX += (leftTopOld[0] - leftTopNew[0]);
    this.imageTranslateY += (leftTopOld[1] - leftTopNew[1]);
  }

  updateExtremeOffset() {
    let totalScale = this.imageScale * this.imagePullingDownScale;
    let matrix = matrix4.identity()
      .scale({
        x: totalScale,
        y: totalScale,
        centerX: this.centerX,
        centerY: this.centerY
      })

    let p = matrix.transformPoint([-this.imageWidth / 2, -this.imageHeight / 2]);
    let leftTopPointX = p[0] + this.imageWidth / 2 + this.imagePositionX;
    let leftTopPointY = p[1] + this.imageHeight / 2 + this.imagePositionY;
    let rightBottomPointX = leftTopPointX + this.imageWidth * totalScale;
    let rightBottomPointY = leftTopPointY + this.imageHeight * totalScale;

    this.realDisplayBoundsLeft = Math.max(this.displayLeft, leftTopPointX);
    this.realDisplayBoundsRight = Math.min(this.displayRight, rightBottomPointX);
    this.realDisplayBoundsTop = Math.max(this.displayTop, leftTopPointY);
    this.realDisplayBoundsBottom = Math.min(this.displayBottom, rightBottomPointY);

    this.minOffsetX = px2vp(this.realDisplayBoundsRight - rightBottomPointX);
    this.maxOffsetX = px2vp(this.realDisplayBoundsLeft - leftTopPointX);
    this.minOffsetY = px2vp(this.realDisplayBoundsBottom - rightBottomPointY);
    this.maxOffsetY = px2vp(this.realDisplayBoundsTop - leftTopPointY);
  }

  updatePanDirection(): void {
    this.panDirection = PanDirection.Vertical;
    let leftTop = this.calculateLeftTopPoint();
    let rightBottom = this.calculateRightBottomPoint();
    if (leftTop[0] < this.displayLeft - 1) {
      this.panDirection = this.panDirection | PanDirection.Right;
    }
    if (rightBottom[0] > this.displayRight + 1) {
      this.panDirection = this.panDirection | PanDirection.Left;
    }
  }

  resetTransform(): void {
    this.imageTranslateX = 0;
    this.imageTranslateY = 0;
    this.imageScale = 1;
    this.imagePullingDownScale = 1;
    this.centerX = 0;
    this.centerY = 0;
    this.updateExtremeOffset();
  }

  cannotPan(): boolean {
    return this.gestureDisabled;
  }

  cannotPinch(): boolean {
    return this.status === Status.PAN_ONLY || this.gestureDisabled;
  }

  aboutToAppear(): void {
    this.photoListener.on('layout', () => {
      this.init();
    });
    this.updateExtremeOffset();
    this.updatePanDirection();
  }

  build() {
    Stack() {
      Column()
        .width('100%')
        .height('100%')
        .backgroundColor(Color.Black)
        .opacity(this.imagePullingDownScale)
        .transition(TransitionEffect.OPACITY)
      Stack() {
        Image($r(this.imageUrl))
          .width(px2vp(this.imageWidth) * this.geometryScale)
          .height(px2vp(this.imageHeight) * this.geometryScale)
          .transform(matrix4.identity()
            .scale({
              x: this.imageScale * this.imagePullingDownScale,
              y: this.imageScale * this.imagePullingDownScale,
              centerX: this.centerX,
              centerY: this.centerY
            })
            .translate({
              x: this.imageTranslateX,
              y: this.imageTranslateY
            }))
          .geometryTransition(this.imageUrl)
          .transition(TransitionEffect.OPACITY)
          .position({
            x: px2vp(this.geometryPositionX),
            y: px2vp(this.geometryPositionY)
          })
      }
      .id(this.imageUrl)
      .width(px2vp(this.imageWidth))
      .height(px2vp(this.imageHeight))
      .parallelGesture(GestureGroup(GestureMode.Parallel,
        PinchGesture()
          .onActionStart((event: GestureEvent) => {
            this.status = Status.PINCHING;
            this.updateCenter([vp2px(event.pinchCenterX), vp2px(event.pinchCenterY)]);
            this.updateTranslateAccordingToCenter();
            this.startGestureScale = this.imageScale;
            this.gestureCount++;
          })
          .onActionUpdate((event: GestureEvent) => {
            this.imageScale = this.startGestureScale * event.scale;
            this.updateExtremeOffset();
          })
          .onActionEnd(() => {
            this.status = Status.IDLE;
            if (this.imageScale < 1) {
              animateTo({ duration: 250, curve: Curve.EaseOut }, () => {
                this.imageScale = 1; // Don't wait until all the gestures are over
              })
            }
            this.gestureCount--;
          }),
        PanGesture({ direction: this.panDirection })
          .onActionStart((event: GestureEvent) => {
            this.panDirection = PanDirection.All;
            let leftTop = this.calculateLeftTopPoint();
            // If the picture is at the top of the display before the single drop down starts, the return condition can be triggered.
            if (leftTop[1] >= this.displayTop - 1 && this.status !== Status.PINCHING) {
              this.status = Status.PAN_ONLY;
            }
            if (this.status !== Status.PINCHING) {
              let currentX: number = event.offsetX;
              let currentY: number = event.offsetY;
              if (event.fingerList[0] !== undefined) {
                currentX = event.fingerList[0].globalX;
                currentY = event.fingerList[0].globalY;
              }
              this.updateCenter([vp2px(currentX - this.imagePositionX), vp2px(currentY) - this.imagePositionY]);
              this.updateTranslateAccordingToCenter();
              this.updateExtremeOffset();
            }
            this.startGestureOffsetX = px2vp(this.imageTranslateX);
            this.startGestureOffsetY = px2vp(this.imageTranslateY);
            this.gestureCount++;
          })
          .onActionUpdate((event: GestureEvent) => {
            let offsetX = event.offsetX;
            let offsetY = event.offsetY;

            // In the drag-only state, the picture completely follows the hand.
            if (this.status === Status.PAN_ONLY) {
              this.imageTranslateX = vp2px(this.startGestureOffsetX + offsetX);
              this.imageTranslateY = vp2px(this.startGestureOffsetY + offsetY);
              this.imagePullingDownScale = 1 - Math.abs(event.offsetY) / px2vp(2720);
            }

            // The rest of the time using dynamic hand comparison.
            if (this.status !== Status.PAN_ONLY) {
              if (offsetX + this.startGestureOffsetX > this.maxOffsetX) {
                let distance = offsetX + this.startGestureOffsetX - this.maxOffsetX;
                offsetX = this.maxOffsetX + distance * (1 - Math.exp(-distance / 300)) - this.startGestureOffsetX;
              }
              if (offsetX + this.startGestureOffsetX < this.minOffsetX) {
                let distance = this.minOffsetX - (offsetX + this.startGestureOffsetX)
                offsetX = this.minOffsetX - distance * (1 - Math.exp(-distance / 300)) - this.startGestureOffsetX;
              }
              if (offsetY + this.startGestureOffsetY > this.maxOffsetY) {
                let distance = offsetY + this.startGestureOffsetY - this.maxOffsetY;
                offsetY = this.maxOffsetY + distance * (1 - Math.exp(-distance / 300)) - this.startGestureOffsetY;
              }
              if (offsetY + this.startGestureOffsetY < this.minOffsetY) {
                let distance = this.minOffsetY - (offsetY + this.startGestureOffsetY)
                offsetY = this.minOffsetY - distance * (1 - Math.exp(-distance / 300)) - this.startGestureOffsetY;
              }
              this.imageTranslateX = vp2px(this.startGestureOffsetX + offsetX);
              this.imageTranslateY = vp2px(this.startGestureOffsetY + offsetY);
            }
          })
          .onActionEnd((event: GestureEvent) => {
            if (this.status === Status.PAN_ONLY) {
              if (event.offsetY > 100) {
                // Trigger return condition.
                this.status = Status.READY_TO_BACK;
              } else {
                this.status = Status.IDLE;
              }
            }
            this.gestureCount--;
          })
      ))
      .onGestureJudgeBegin((gestureInfo: GestureInfo) => {
        if (gestureInfo.type === GestureControl.GestureType.PAN_GESTURE) {
          return this.cannotPan() ? GestureJudgeResult.REJECT : GestureJudgeResult.CONTINUE;
        }
        if (gestureInfo.type === GestureControl.GestureType.PINCH_GESTURE) {
          return this.cannotPinch() ? GestureJudgeResult.REJECT : GestureJudgeResult.CONTINUE;
        }
        return GestureJudgeResult.CONTINUE;
      })
    }
    .width('100%')
    .height('100%')
  }
}

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已于2024-12-12 19:00:13修改
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