如何在颤动中隐藏布局溢出消息

Question

我是 Flutter.Working 的新手，底部 sheet.Bottom sheet 具有正常的恒定高度。它的高度会随着拖动而增加。请参考代码 below.Issue 是当底部 sheet 是正常尺寸的视图溢出时。请参考附图。我想删除 window.

中的溢出消息

class MyBottomSheet extends StatefulWidget {
  @override
  _MyBottomSheetState createState() => new _MyBottomSheetState();
}

class _MyBottomSheetState extends State<MyBottomSheet> {
  Offset dragDetail;
  double slidingPercent;
  static const PAGE_FULL_HEIGHT= 600.0;
  static const PAGE_NORMAL_HEIGHT=80.0;
  SlideDirection direction;
  static double pageHeight = PAGE_NORMAL_HEIGHT;
  static PagePosition pagePosition = PagePosition.Bottom;

  onVerticalStart(DragStartDetails details) {
    dragDetail = details.globalPosition;
  }

  onVerticalEnd(DragEndDetails details) {
    setState(() {
      if (pageHeight < 300) {
        pageHeight = PAGE_NORMAL_HEIGHT;
        pagePosition = PagePosition.Bottom;
      } else if (pageHeight > 300) {
        pageHeight = PAGE_FULL_HEIGHT;
        pagePosition = PagePosition.Top;
      }
    });
  }

  onVerticalUpdate(DragUpdateDetails details) {
    setState(() {
      if (dragDetail != null) {
        final newPosition = details.globalPosition;
        final dy = dragDetail.dy - newPosition.dy;

        if (dy > 0.0) {
          direction = SlideDirection.bottomToTop;
        } else if (dy < 0.0) {
          direction = SlideDirection.topToBottom;
        }

        if (direction == SlideDirection.bottomToTop &&
            pagePosition != PagePosition.Top) {
          pageHeight =
              ((dy / PAGE_FULL_HEIGHT) * 1000).abs().clamp(PAGE_NORMAL_HEIGHT, PAGE_FULL_HEIGHT);
        } else if (direction == SlideDirection.topToBottom &&
            pagePosition != PagePosition.Bottom) {
          pageHeight = PAGE_FULL_HEIGHT -
              ((dy / PAGE_FULL_HEIGHT) * 1000).abs().clamp(PAGE_NORMAL_HEIGHT, PAGE_FULL_HEIGHT);
        }
      }
    });
  }

  Column buildButtonColumn(IconData icon, String label) {

    return new Column(
      mainAxisSize: MainAxisSize.min,
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        new Icon(icon),
        new Container(
          margin: const EdgeInsets.only(left: 30.0,right: 30.0),
          child: new Text(
            label,
            style:  new TextStyle(
              fontSize: 12.0,
              fontWeight: FontWeight.w400,
              color: Colors.blue,
            ),
          ),
        ),
      ],
    );
  }


  @override
  Widget build(BuildContext context) {
    return new Container(
      height: pageHeight,
      width: MediaQuery.of(context).size.width,
      child: new Stack(
        children: <Widget>[
          new Padding(
            padding: const EdgeInsets.fromLTRB(5.0, 5.0, 5.0, 0.0),
            child: new Card(
              elevation: 5.0,
              child: new PhysicalModel(
                  shape: BoxShape.rectangle,
                  borderRadius: new BorderRadius.circular(5.0),
                  color: Colors.black12,
                  child: new Padding(
                    padding: const EdgeInsets.all(8.0),
                    child: new Column(
                      children: <Widget>[
                        new Align(
                          alignment: Alignment.topCenter,
                          child: new Row(
                            mainAxisAlignment: MainAxisAlignment.center,
                            children: <Widget>[
                              buildButtonColumn(Icons.local_offer, 'Offer'),
                              buildButtonColumn(Icons.notifications_active, 'Notification'),
                              buildButtonColumn(Icons.shopping_cart, 'Cart'),
                            ],
                          ),
                        ),
                        new Divider(color: Colors.black,)
                      ],
                    ),
                  )),

            ),
          ),
          new GestureDetector(
            onVerticalDragStart: onVerticalStart,
            onVerticalDragEnd: onVerticalEnd,
            onVerticalDragUpdate: onVerticalUpdate,
          )
        ],
      ),
    );
  }
}

正常尺寸

全尺寸

Answer 1

在flutter中，溢出被认为是一个错误。并且应该被修复，而不是被忽略。

在您的情况下，是底页根容器中的 height: pageHeight 导致问题，因为它太小了。

删除或增加其值应该可以解决您的问题。

Answer 2

尝试使用 OverflowBox 包装您的小部件

如何在颤动中隐藏布局溢出消息

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