我怎样才能删除填充PopupMenuButton？我尝试使用padding属性，但它是图标的填充。
但发现了一些东西popup_menu.dart
const double _kMenuHorizontalPadding = 16.0;
const double _kMenuDividerHeight = 16.0;
const double _kMenuMaxWidth = 5.0 * _kMenuWidthStep;
const double _kMenuMinWidth = 2.0 * _kMenuWidthStep;
const double _kMenuVerticalPadding = 8.0;
设法删除水平填充，但我不知道如何删除弹出菜单中的垂直填充。
这是我用来删除水平填充的代码。
class AppPopUpMenuState extends PopupMenuItemState<int, AppPopUpButton> {
@override
Widget build(BuildContext context) {
final ThemeData theme = Theme.of(context);
final PopupMenuThemeData popupMenuTheme = PopupMenuTheme.of(context);
TextStyle style = widget.textStyle ??
popupMenuTheme.textStyle ??
theme.textTheme.subtitle1;
if (!widget.enabled) style = style.copyWith(color: theme.disabledColor);
Widget item = AnimatedDefaultTextStyle(
style: style,
duration: kThemeChangeDuration,
child: Container(
color: widget.color,
width: widget.width,
alignment: Alignment.center,
// padding: const EdgeInsets.symmetric(horizontal: _kMenuHorizontalPadding), //padding in library
padding: widget.padding, // code that changed
margin: EdgeInsets.zero,
constraints: BoxConstraints(minHeight: widget.height),
child: buildChild(),
),
);
if (!widget.enabled) {
final bool isDark = theme.brightness == Brightness.dark;
item = IconTheme.merge(
data: IconThemeData(opacity: isDark ? 0.5 : 0.38),
child: item,
);
}
return InkWell(
onTap: widget.enabled ? handleTap : null,
canRequestFocus: widget.enabled,
child: item,
);
}
}
PopupMenu用于构建菜单的库中的代码
class _PopupMenu<T> extends StatelessWidget {
const _PopupMenu({
Key key,
this.route,
this.semanticLabel,
}) : super(key: key);
final _PopupMenuRoute<T> route;
final String semanticLabel;
@override
Widget build(BuildContext context) {
final double unit = 1.0 / (route.items.length + 1.5); // 1.0 for the width and 0.5 for the last item's fade.
final List<Widget> children = <Widget>[];
final PopupMenuThemeData popupMenuTheme = PopupMenuTheme.of(context);
for (int i = 0; i < route.items.length; i += 1) {
final double start = (i + 1) * unit;
final double end = (start + 1.5 * unit).clamp(0.0, 1.0) as double;
final CurvedAnimation opacity = CurvedAnimation(
parent: route.animation,
curve: Interval(start, end),
);
Widget item = route.items[i];
if (route.initialValue != null && route.items[i].represents(route.initialValue)) {
item = Container(
color: Theme.of(context).highlightColor,
child: item,
);
}
children.add(
_MenuItem(
onLayout: (Size size) {
route.itemSizes[i] = size;
},
child: FadeTransition(
opacity: opacity,
child: item,
),
),
);
}
final CurveTween opacity = CurveTween(curve: const Interval(0.0, 1.0 / 3.0));
final CurveTween width = CurveTween(curve: Interval(0.0, unit));
final CurveTween height = CurveTween(curve: Interval(0.0, unit * route.items.length));
final Widget child = ConstrainedBox(
constraints: const BoxConstraints(
minWidth: _kMenuMinWidth,
maxWidth: _kMenuMaxWidth,
),
child: IntrinsicWidth(
stepWidth: _kMenuWidthStep,
child: Semantics(
scopesRoute: true,
namesRoute: true,
explicitChildNodes: true,
label: semanticLabel,
child: SingleChildScrollView(
padding: const EdgeInsets.symmetric(
vertical: _kMenuVerticalPadding
),
child: ListBody(children: children),
),
),
),
);
return AnimatedBuilder(
animation: route.animation,
builder: (BuildContext context, Widget child) {
return Opacity(
opacity: opacity.evaluate(route.animation),
child: Material(
shape: route.shape ?? popupMenuTheme.shape,
color: route.color ?? popupMenuTheme.color,
type: MaterialType.card,
elevation: route.elevation ?? popupMenuTheme.elevation ?? 8.0,
child: Align(
alignment: AlignmentDirectional.topEnd,
widthFactor: width.evaluate(route.animation),
heightFactor: height.evaluate(route.animation),
child: child,
),
),
);
},
child: child,
);
}
}