小编sai*_*oue的帖子

我想制作一个可拖动的浮动按钮，如果可能的话，在控制台中打印拖动位置。

Her's a concrete example of using both Positionned Widget and Align Widget! But I had a problem figuring what to use ! though original problem is to set some FABs's Offsets relatively to its Container not to the screen

Stack(
      children: <Widget>[
        Positioned(left: 0.0, child: Text("Top\nleft")),
        Positioned(bottom: 0.0, child: Text("Bottom\nleft")),
        Positioned(top: 0.0, right: 0.0, child: Text("Top\nright")),
        Positioned(bottom: 0.0, right: 0.0, child: Text("Bottom\nright")),
        Positioned(bottom: 0.0, right: 0.0, child: Text("Bottom\nright")),
        Positioned(left: width / 2, top: height / 2, child: Text("Center")),
        Positioned(top: height …