在堆栈中填充所有可用的水平 space

Question

在卡片中，我有一个堆栈，其中包含 1) 图像和 2) 容器中的文本。如何让容器的宽度填满卡片的宽度？

Card(
  clipBehavior: Clip.antiAlias,
  child: Stack(
    children: <Widget>[
      Positioned.fill(child: Image.network(
          image_url,
          fit: BoxFit.fitWidth,
        ),
      ),
      Positioned(
        bottom: 0,
        child: Container(
          padding: new EdgeInsets.fromLTRB(10.0, 5.0, 10.0, 5.0),
          decoration: new BoxDecoration(color: Colors.black12),
          child: Row(
            children: <Widget>[
              Text("test1"),
              Text("test2"),
              Text("test3"),
            ],
          ),
        ),
      ),
    ],
  )
);

Answer 1

用 Expanded 小部件包裹所有孩子。

Row(
    children: <Widget>[
        Expanded(
            child: Text("test1")
        ),
        Expanded(
            child: Text("test2")
        ),
        Expanded(
            child: Text("test3")
        ),
    ],
),

来自Expanded Widget Documentation：

Using an Expanded widget makes a child of a Row, Column, or Flex expand to fill the available space in the main axis (e.g., horizontally for a Row or vertically for a Column). If multiple children are expanded, the available space is divided among them according to the flex factor.

Answer 2

将 left 和 right 的值设置为 0 以便容器的行为如此。

Card(
  clipBehavior: Clip.antiAlias,
  child: Stack(
    children: <Widget>[
      Positioned.fill(child: Image.network(
          image_url,
          fit: BoxFit.fitWidth,
        ),
      ),
      Positioned(
        bottom: 0,
        left: 0,
        right: 0,
        child: Container(
          padding: new EdgeInsets.fromLTRB(10.0, 5.0, 10.0, 5.0),
          decoration: new BoxDecoration(color: Colors.black12),
          child: Row(
            children: <Widget>[
              Text("test1"),
              Text("test2"),
              Text("test3"),
            ],
          ),
        ),
      ),
    ],
  )
);

在堆栈中填充所有可用的水平 space

Fill all available horizontal space in a stack

stack

containers

width

flutter

flutter-layout