[英]How can i change the width/padding of a Flutter DropdownMenuItem in a DropdownButton?
[英]How to indent between DropdownButton and DropdownMenuItem in flutter
我正在使用DropdownButton
并且遇到以下错误。 打开DropdownMenuItem
列表时,按钮本身没有缩进。 也就是说,我需要获取按钮(DropdownButton)和下拉列表(DropdownMenuItem)之间的padding
,以便有距离。 但到目前为止,我还无法做到。 你怎么能在他们之间做一个缩进?
代码
@override
Widget build(BuildContext context) {
return SizedBox(
width: widget.width,
child: DropdownButtonHideUnderline(
child: DropdownButton2(
items: List.generate(
widget.items.length,
(index) => DropdownMenuItem<String>(
value: widget.items[index],
child: Container(
decoration: BoxDecoration(
border: Border(
bottom: BorderSide(
color: Colors.white.withOpacity(0.1),
width: 1,
),
),
),
child: StatefulBuilder(
builder: (context, setStateSB) => GFCheckboxListTile(
value: _selectedTitles.contains(widget.items[index]),
onChanged: (bool selected) {
_onItemSelect(selected, index);
setStateSB(() {});
},
selected: selected,
title: Text(
widget.items[index],
style: constants.Styles.smallTextStyleWhite,
),
padding: const EdgeInsets.only(top: 12, bottom: 13),
margin: const EdgeInsets.only(right: 0, left: 0),
size: 22,
activeBgColor: constants.Colors.greyCheckbox,
activeBorderColor: constants.Colors.greyXMiddle,
inactiveBgColor: constants.Colors.greyCheckbox,
activeIcon: SvgPicture.asset(constants.Assets.checkboxIcon),
inactiveBorderColor: constants.Colors.greyXMiddle,
type: type,
),
),
),
),
),
hint: _selectedTitles.length > 1
? const Text('Selecte EV',
style: constants.Styles.bigBookTextStyleWhite)
: Text(_selectedTitles.join().toString(),
style: constants.Styles.bigBookTextStyleWhite),
value: selectedValue,
onChanged: (value) {
setState(() {
selectedValue = value as String;
});
},
icon: SvgPicture.asset(constants.Assets.arrowDropdown),
iconSize: 21,
buttonHeight: 27,
itemHeight: 47,
dropdownMaxHeight: 185,
dropdownWidth: 140,
dropdownDecoration: BoxDecoration(
borderRadius: BorderRadius.circular(8),
border: Border.all(
color: constants.Colors.purpleMain,
),
color: constants.Colors.greyDark),
selectedItemBuilder: (context) {
return widget.items.map(
(item) {
return Row(
children: [
widget.icon ?? const SizedBox(),
const SizedBox(width: 8),
Text(
item,
style: constants.Styles.bigBookTextStyleWhite,
),
],
);
},
).toList();
},
),
),
);
}
}
在dropdown_button2
文档中,有一个用于移动下拉菜单Offset
的属性。 你可以在这里看到它https://pub.dev/documentation/dropdown_button2/latest/dropdown_button2/DropdownButton2/offset.html
在该属性上,您只需要设置一个Offset
,它由X
和Y
值组成。
在您的情况下,它看起来像这样:
DropdownButton2(
offset: Offset(0,10),
...
),
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