颤振布局行/列 - 共享宽度,扩展高度

Question

我在Flutter的布局方面仍然遇到一些麻烦.
现在我希望在象限布局中在3个小部件之间共享可用空间.宽度均匀分享(这可以通过Expanded一行中的两个小部件正常工作),但现在我也希望高度自动调整widget3.height == widget1.height + widget2.height. 如果内容widget3较大,我想要widget1并widget2调整它们的高度,反之亦然.

这在Flutter中甚至可能吗？

Answer 1

看看IntrinsicHeight; 包装根行应该提供您正在寻找的效果:

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Scaffold(
        appBar: AppBar(title: Text('Rows & Columns')),
        body: RowsAndColumns(),
      ),
    );
  }
}

class RowsAndColumns extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.only(top: 100.0),
      child: IntrinsicHeight(
        child: Row(crossAxisAlignment: CrossAxisAlignment.stretch, children: [
          Expanded(
            child: Column(children: [
              Container(height: 120.0, color: Colors.yellow),
              Container(height: 100.0, color: Colors.cyan),
            ]),
          ),
          Expanded(child: Container(color: Colors.amber)),
        ]),
      ),
    );
  }
}

调整列中容器的高度会导致右侧的容器调整大小以匹配:

https://gist.github.com/mjohnsullivan/c5b661d7b3b4ca00599e8ef87ff6ac61

Answer 2

由于IntrinsicHeight被认为相对昂贵，所以最好避免它。您可以Table与VerticalAlignment 一起使用：TableCellVerticalAlignment.fill中最大的TableCell。

请注意，如果您.fill在所有单元格中使用，则高度TableRow将为零。

  Table(children: [
    TableRow(children: [
      Column(
        crossAxisAlignment: CrossAxisAlignment.stretch,
        children: [
          Container(
            alignment: Alignment.center,
            color: Colors.blue,
            child: Text('Widget 1'),
          ),
          Container(
            alignment: Alignment.center,
            color: Colors.green,
            child: Text('Widget 2'),
          ),
        ],
      ),
      TableCell(
          verticalAlignment: TableCellVerticalAlignment.fill,
          child: Container(
            alignment: Alignment.center,
            color: Colors.orange,
            child: Text('Widget 3'),
          )),
    ]),
  ]),

Answer 3

我认为你可以设置行的高度，然后你只需要设置列容器的高度，并且使用crossAxisAlignment: CrossAxisAlignment.stretch第二行将扩展占据他的父高度：

Row(
  crossAxisAlignment: CrossAxisAlignment.stretch,
  children: [
    Expanded(
      child: Column(
        children: [
          Expanded(
            // If you don't have the height you can expanded with flex
            flex: 1,
            child: Container(
              height: 50,
              color: Colors.blue,
            ),
          ),
          Expanded(
            flex: 1,
            child: Container(
              height: 50,
              color: Colors.red,
            ),
          )
        ],
      ),
    ),
    Expanded(
      child: Container(
        color: Colors.yellow,
      ),
    )
  ],
)