Swiper高度可变化效果实现

Swiper() {
  Column() {
    Stack() {
      Text('功能栏')
        .textAlign(TextAlign.Center)
        .margin({ top: $r('app.integer.swipersmoothvariation_margin_small'), left: $r('app.integer.swipersmoothvariation_default_padding') })
            // swiper第一个page
        this.GridBuilderFunction(this.dataPageOne, Const.GRID_DOUBLE_HEIGHT, Const.GRID_TEMPLATE)
    }
    .alignContent(Alignment.TopStart)
  }

  // swiper第二个page
  this.GridBuilderFunction(this.dataPageTwo, Const.GRID_DOUBLE_HEIGHT, Const.GRID_TEMPLATE)
  // swiper第三个page
  this.GridBuilderFunction(this.dataPageThree, Const.GRID_DOUBLE_HEIGHT, Const.GRID_TEMPLATE)
  // swiper第四个page
  this.GridBuilderFunction(this.dataPageFour, Const.GRID_DOUBLE_HEIGHT, Const.GRID_TEMPLATE)
}

Swiper{
  ...
}
.onGestureSwipe((index: number, extraInfo: SwiperAnimationEvent) => {
  animateTo({
    duration: Const.DURATION,
    curve: Curve.EaseOut,
    playMode: PlayMode.Normal,
    onFinish: () => {
      logger.info('play end');
    }
  }, () => { // 通过左右滑动的距离来计算对应的上下位置的变化
    if (index === 0 && extraInfo.currentOffset < 0) {
      this.swiperDistance = extraInfo.currentOffset / Const.SCROLL_WIDTH * Const.SMALL_FONT_SIZE;
    } else if (index === 1 && extraInfo.currentOffset > 0) {
      this.swiperDistance = extraInfo.currentOffset / Const.SCROLL_WIDTH * Const.SMALL_FONT_SIZE - Const.SMALL_FONT_SIZE;
    } else if (index === 2 && extraInfo.currentOffset < 0) {
      this.swiperDistance = extraInfo.currentOffset / Const.SCROLL_WIDTH * Const.GRID_SINGLE_HEIGHT - Const.SMALL_FONT_SIZE;
    } else if (index === 3 && extraInfo.currentOffset > 0) {
      this.swiperDistance = extraInfo.currentOffset / Const.SCROLL_WIDTH * Const.GRID_SINGLE_HEIGHT - Const.SMALL_FONT_SIZE - Const.GRID_SINGLE_HEIGHT;
    }
  })
})

Swiper{
  ...
}
.onAnimationStart((_: number, targetIndex: number) => {
  animateTo({
    duration: Const.DURATION,
    curve: Curve.EaseOut,
    playMode: PlayMode.Normal,
    onFinish: () => {
      logger.info('play end');
    }
  }, () => {
    if (targetIndex === 0) {
      this.swiperDistance = 0;
    } else if (targetIndex === 1 || targetIndex === 2) {
      this.swiperDistance = -Const.SMALL_FONT_SIZE;
    } else {
      this.swiperDistance = -Const.SMALL_FONT_SIZE - Const.GRID_SINGLE_HEIGHT;
    }
  })
})

   swipersmoothvariation                // har包
   |---common
   |   |---CommonConstants.ets          // 提供自定义数据    
   |---pages
   |   |---MainPage.ets                 // 滑动变化效果实现页面