Flutter RenderFlex在Column Widget右侧溢出了15个像素

Question

我创建了一个自定义ListTile，它应该有两个以中间为中心的分数以及左边和右边的信息（screenshot）。

左边的信息可以有任意长度，并且当它太长时应该使用TextOverflow.ellipsis。我不能让这个工作，因为Text似乎不知道它应该具有的宽度和溢出。我已经尝试将Text小部件包装到SizedBox，Expanded等中。这没有用。

    flutter: ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
    flutter: The following message was thrown during layout:
    flutter: A RenderFlex overflowed by 15 pixels on the right.
    flutter:
    flutter: The overflowing RenderFlex has an orientation of Axis.horizontal.
    flutter: The edge of the RenderFlex that is overflowing has been marked in the rendering with a yellow and
    flutter: black striped pattern. This is usually caused by the contents being too big for the RenderFlex.
    flutter: Consider applying a flex factor (e.g. using an Expanded widget) to force the children of the
    flutter: RenderFlex to fit within the available space instead of being sized to their natural size.
    flutter: This is considered an error condition because it indicates that there is content that cannot be
    flutter: seen. If the content is legitimately bigger than the available space, consider clipping it with a
    flutter: ClipRect widget before putting it in the flex, or using a scrollable container rather than a Flex,
    flutter: like a ListView.
    flutter: The specific RenderFlex in question is:
    flutter:   RenderFlex#c64e4 relayoutBoundary=up11 OVERFLOWING
    flutter:   creator: Row ← Expanded ← Row ← Column ← ConstrainedBox ← Container ← Listener ← _GestureSemantics
    flutter:   ← RawGestureDetector ← GestureDetector ← InkWell ← ScopedModelDescendant<BaseballModel> ← ⋯
    flutter:   parentData: offset=Offset(0.0, 0.0); flex=1; fit=FlexFit.tight (can use size)
    flutter:   constraints: BoxConstraints(w=143.0, 0.0<=h<=Infinity)
    flutter:   size: Size(143.0, 70.0)
    flutter:   direction: horizontal
    flutter:   mainAxisAlignment: start
    flutter:   mainAxisSize: max
    flutter:   crossAxisAlignment: center
    flutter:   textDirection: ltr
    flutter:   verticalDirection: down
    flutter: ◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤

我的代码如下：

@immutable
class GameTile extends StatelessWidget {
  final Game game;
  Color highligtColor = Colors.red;

  GameTile({this.game});

  @override
  Widget build(BuildContext context) {
    return InkWell(
      child: Container(
        height: 70.0,
        child: Column(
          children: <Widget>[
            Row(
              children: <Widget>[
                Expanded(
                  child: Row(
                    children: <Widget>[
                      Container(
                        width: 8.0,
                        height: 70.0,
                        color: highligtColor,
                      ),
                      Padding(
                        padding: EdgeInsets.only(left: 15.0),
                        child: Column(
                          crossAxisAlignment: CrossAxisAlignment.start,
                          children: <Widget>[
                            Text(
                              game.awayTeam.name,
                              overflow: TextOverflow.ellipsis,
                            ),
                            Text(
                              game.homeTeam.name,
                              overflow: TextOverflow.ellipsis,
                            ),
                          ],
                        ),
                      ),
                    ],
                  ),
                ),
                Padding(
                  padding: const EdgeInsets.only(left: 8.0, right: 8.0),
                  child: Column(
                    children: [
                      Text(
                        game.awayRuns,
                        style: TextStyle(fontWeight: FontWeight.w900),
                      ),
                      Text(
                        game.homeRuns,
                        style: TextStyle(fontWeight: FontWeight.w900),
                      ),
                    ],
                  ),
                ),
                Expanded(
                  child: Row(
                    mainAxisAlignment: MainAxisAlignment.end,
                    children: <Widget>[
                      Column(
                          crossAxisAlignment: CrossAxisAlignment.end,
                          children: <Widget>[
                            Text(game.getFormattedDate()),
                            Text(game.getFormattedTime()),
                          ]),
                      Padding(
                        padding: EdgeInsets.only(left: 8.0, right: 10.0),
                        child: Container(),
                      )
                    ],
                  ),
                )
              ],
            )
          ],
        ),
      ),
    );
  }
}

Answer 1

关于例外

我在手机上运行了你的代码，只有在干预了团队名称和小部件的宽度之后才发生异常。

我认为这个问题的出现是因为你的代码不能很好地适应不同的显示大小，特别是如果团队名称有不同的长度：

具有更灵活和动态小部件的具体解决方案

我创建了一个修改过的小部件，可以很好地适应约束更改，并以更聪明的方式使用可用空间。我通过尽可能展平你的嵌套Rows和Columns来做到这一点，从而产生一个更浅，更灵活的小部件树：

return InkWell(
  child: Container(
    height: 70.0,
    child: Row(
      crossAxisAlignment: CrossAxisAlignment.center,
      children: <Widget>[
        Container(width: 8.0, height: 70.0, color: highlightColor),
        SizedBox(width: 15.0),
        Column(
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: <Widget>[
            Text(game.awayTeam.name, overflow: TextOverflow.ellipsis),
            Text(game.homeTeam.name, overflow: TextOverflow.ellipsis),
          ],
        ),
        Spacer(),
        Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text(game.awayRuns, style: TextStyle(fontWeight: FontWeight.w900)),
            Text(game.homeRuns, style: TextStyle(fontWeight: FontWeight.w900)),
          ],
        ),
        Spacer(),
        Column(
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.end,
          children: <Widget>[
            Text(game.getFormattedDate()),
            Text(game.getFormattedTime()),
          ]
        ),
        SizedBox(width: 18.0),
      ],
    ),
  ),
);

处理困难约束时的一般提示

大多数情况下，最好只在浅树中使用几个小部件。嵌套各种“组织”小部件，特别是Columns，Rows和Expandeds经常会产生这样的情况：Expanded总是要求相同的大小（或父级大小的比例），甚至不考虑其内容的维度。

这可能导致内容溢出，而在窗口小部件的其他部分有未使用的负空间。

Answer 2

只需用Flexible包装溢出的小部件

new Row(
          mainAxisAlignment: MainAxisAlignment.start,
          children: <Widget>[
            new Checkbox(
              onChanged: (bool){},
            ),
            Flexible(
              child: new Text(
                "This text can be so loooooooooooooong",
              ),
            ),

          ],
        ),