startAutoPlay method

void startAutoPlay()

Implementation

void startAutoPlay() {
  if (!widget.autoScroll) return;
  if (itemCount <= 1) return;
  //参考RestartableTimer的写法
  if (_autoPlayTimer == null && cycleRolling) {
    SchedulerBinding.instance!.addPostFrameCallback((timeStamp) {
      _autoPlayTimer = Timer.periodic(
          Duration(seconds: widget.autoPlaySeconds),
          (timer) {
            /// 只有一个像素时，不开启自动轮播
        if (itemCount <= 1) {
          return;
        }

          /// 用户在触摸时，不开启轮播
        if (_inTouch) {
          return;
        }
          /// 非活跃态，不开启自动轮播
        if (!_isActive) {
          return;
        }

        // false 说明没有手动滑动过，触发自动滚动
        if (!_jumpAutoScroll) {
          autoMoveToNextIndex();
        } else {
          _jumpAutoScroll = false;
        }
      });
    });
  }
}