Function changeIndex

packages/react-photo-view/src/PhotoSlider.tsx:172–197

(nextIndex: number, isPause: boolean = false)

      onClose(evt);
    },
    changeIndex(nextIndex: number, isPause: boolean = false) {
      // 当前索引
      const currentIndex = enableLoop ? virtualIndexRef.current + (nextIndex - index) : nextIndex;
      const max = imageLength - 1;
      // 虚拟 index
      // 非循环模式，限制区间
      const limitIndex = limitNumber(currentIndex, 0, max);
      const nextVirtualIndex = enableLoop ? currentIndex : limitIndex;
      // 单个屏幕宽度
      const singlePageWidth = innerWidth + horizontalOffset;

      updateState({
        touched: false,
        lastCX: undefined,
        lastCY: undefined,
        x: -singlePageWidth * nextVirtualIndex,
        pause: isPause,
      });

      virtualIndexRef.current = nextVirtualIndex;
      // 更新真实的 index
      const realLoopIndex = nextIndex < 0 ? max : nextIndex > max ? 0 : nextIndex;
      if (onIndexChange) {
        onIndexChange(enableLoop ? realLoopIndex : limitIndex);
      }
    },
  });

  useEventListener('keydown', (evt: KeyboardEvent) => {