Dart 如何取消future

三种方式

• 转Stream

StreamSubscription? a= setSprayWithWheelWithFuture().asStream().listen((event) {
            setSprayWithWheel(right, isForce: true);
          };

a?.canel();

Future setSprayWithWheelWithFuture() async {
    await Future.delayed(Duration(seconds: 1));
  }

• CancelableOperation
  需要依赖async 库

await setSprayWithWheelFuture?.cancel();
setSprayWithWheelFuture = CancelableOperation.fromFuture(setSprayWithWheelWithFuture(right));
int? value = await setSprayWithWheelFuture?.value;
print('setSprayWithWheelFuture::value=$value'); //cancel 后 这行之后的代码不会执行 实现原理猜测是寄存器存储了当前执行的位置 类似协程概念
if (value != null) {
setSprayWithWheel(right, isForce: true);
}

• timeout
  没有上述两种方式灵活以及支持场景不丰富

setSprayWithWheelWithFuture().timeout(
      const Duration(seconds: 1),
      onTimeout: () =>
          'The process took too much time to finish. Please try again later',
);

有哪些场景?
以下是我遇到的场景

• 固件升级过程的中途取消
• 设备滚轮控制角度 需要去抖且需要保证最后一条角度数据能够生效