Flutter Dropdown_Below

A Flutter Dropdown library which is customize flutter dropdownbutton widget.

Options

options	description	required
itemWidth	dropdown item’s box width	X
itemTextstyle	dropdown item’s text style	X
boxTextstyle	seletced box text style	X
boxPadding	seletced box inner padding	X
boxHeight	seletced box height	X
boxWidth	seletced box width	X
hint	text before you choose item	X
value	selected item	X
items	itemsList	O
onChange	change item function	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;

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;
  }

3. change function

  onChangeDropdownTests(selectedTest) {
    print(selectedTest);
    setState(() {
      _selectedTest = selectedTest;
    });
  }

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,
    ),

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();
});

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,
)

Actually, dropdown widget is made by Navigation. So, it can work.