Flutter之阻断手势冒泡

两种解决方案：

1. 通过Stack布局，解除两个widget的嵌套关系
   2.通过IgnorePointer忽视事件传递

      body: Center(
        child: Stack(
          alignment: Alignment.center,
          children: [
            GestureDetector(
              onTapDown: (gesture){
                print("绿色");
              },
              child: Container(
                height: 200,
                width: 200,
                color: Colors.green,
              ),
            ),
            IgnorePointer(
              child: GestureDetector(
                onTapDown: (gesture){
                  print("红色");
                },
                child: Container(
                  height: 100,
                  width: 100,
                  color: Colors.red,
                ),
              ),
            )
          ],
        )
      ),