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Description:

dropdown below

Flutter Dropdown_Below #
A Flutter Dropdown library which is customize flutter dropdownbutton widget.

Options #

options
description
type
required

itemWidth
dropdown item's box width
double
X

itemTextstyle
dropdown item's text style
double
X

boxTextstyle
seletced box text style
TextStyle
X

boxPadding
seletced box inner padding
EdgeInsetsGeometry
X

boxHeight
seletced box height
double
X

boxWidth
seletced box width
double
X

hint
text before you choose item
Widget
X

value
selected item
T
X

boxDecoration
box's border, borderRadius, color
BoxDecoration
X

icon
widget which is right beside
Widget
X

items
itemsList
List<DropdownMenuItem
O

onChange
change item function
ValueChanged
O

How to make it Work? #
Description for example. #
1. datas #
_testList's type is always be a list.
If you want to use map or other type, you can customize this package.
List _testList = [{'no': 1, 'keyword': 'blue'},{'no': 2, 'keyword': 'black'},{'no': 3, 'keyword': 'red'}];
List<DropdownMenuItem> _dropdownTestItems;
var _selectedTest;
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2. initState & build items to correct type #
If you want to customize item's child widget ex) Text -> Container, You can change any widget you want.
@override
void initState() {
_dropdownTestItems = buildDropdownTestItems(_testList);
super.initState();
}

List<DropdownMenuItem> buildDropdownTestItems(List _testList) {
List<DropdownMenuItem> items = List();
for (var i in _testList) {
items.add(
DropdownMenuItem(
value: i,
child: Text(i['keyword']),
),
);
}
return items;
}
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3. change function #
onChangeDropdownTests(selectedTest) {
print(selectedTest);
setState(() {
_selectedTest = selectedTest;
});
}
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4. UI #
Dropdown Widget.
DropdownBelow(
itemWidth: 200,
itemTextstyle: TextStyle(fontSize: 14, fontWeight: FontWeight.w400, color: Colors.black),
boxTextstyle: TextStyle(fontSize: 14, fontWeight: FontWeight.w400, color: Color(0XFFbbbbbb)),
boxPadding: EdgeInsets.fromLTRB(13, 12, 0, 12),
boxHeight: 45,
boxWidth: 200,
hint: Text('choose item'),
value: _selectedTest,
items: _dropdownTestItems,
onChanged: onChangeDropdownTests,
),
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5. Question #
IF you want to make itemBox dropdown when you enter the page?
Put this code to initState like this.
Timer(Duration(milliseconds: 200), () {
CustomDropdownButtonState state = dropdownKey1.currentState;
state.callTap();
});
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And put key to Widget like this.
DropdownBelow(
key: dropdownKey1,
itemWidth: 200,
itemTextstyle: TextStyle(fontSize: 14, fontWeight: FontWeight.w400, color: Colors.black),
boxTextstyle: TextStyle(fontSize: 14, fontWeight: FontWeight.w400, color: Color(0XFFbbbbbb)),
boxPadding: EdgeInsets.fromLTRB(13, 12, 0, 12),
boxHeight: 45,
boxWidth: 200,
hint: Text('choose item'),
value: _selectedTest,
items: _dropdownTestItems,
onChanged: onChangeDropdownTests,
)
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Actually, dropdown widget is made by Navigation. So, it can work.