Combine two similar classes into one class in flutter - flutter

Question

I have two dropdownbutton, they differ in that one has checkboxes and the other doesn't. The code is similar and I think it would be better to put everything in one class. I tried to do this, the dropdownbutton with the checkbox did not work correctly for me. Can you tell me if these 2 codes can be placed in one class? And how to do it right?
code_1
class DropdownWidget extends StatefulWidget {
List<String> items;
SvgPicture? icon;
double width;
bool isCheckbox;
DropdownWidget(
{Key? key,
required this.items,
required this.icon,
required this.width,
this.isCheckbox = false})
: super(key: key);
#override
State<DropdownWidget> createState() => _DropdownWidgetState();
}
class _DropdownWidgetState extends State<DropdownWidget> {
String? selectedValue;
bool isChecked = false;
#override
void initState() {
super.initState();
if (widget.items.isNotEmpty) {
selectedValue = widget.items[1];
}
}
#override
Widget build(BuildContext context) {
return SizedBox(
width: widget.width,
child: DropdownButtonHideUnderline(
child: DropdownButton2(
items: widget.items
.map(
(item) => DropdownMenuItem<String>(
value: item,
child: Container(
decoration: BoxDecoration(
border: Border(
bottom: BorderSide(
color: constants.Colors.white.withOpacity(0.1),
width: 1,
),
),
),
child: Center(
child: Row(
children: [
if (item == selectedValue)
const SizedBox(
width: 0,
),
Expanded(
child: Text(
item,
style: constants.Styles.smallTextStyleWhite,
),
),
if (item == selectedValue)
const Icon(
Icons.check,
color: constants.Colors.purpleMain,
),
],
),
),
),
),
)
.toList(),
value: selectedValue,
onChanged: (value) {
setState(() {
selectedValue = value as String;
});
},
icon: SvgPicture.asset(constants.Assets.arrowDropdown),
iconSize: 21,
buttonHeight: 27,
itemHeight: 47,
dropdownMaxHeight: 191,
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();
},
),
),
);
}
}
code_2
class CheckboxDropdown extends StatefulWidget {
List<String> items;
SvgPicture? icon;
double width;
CheckboxDropdown({
Key? key,
required this.items,
this.icon,
required this.width,
}) : super(key: key);
#override
State<CheckboxDropdown> createState() => _CheckboxDropdown();
}
class _CheckboxDropdown extends State<CheckboxDropdown> {
String? selectedValue;
bool selected = false;
final List _selectedTitles = [];
final List _selectedTitlesIndex = [];
final GFCheckboxType type = GFCheckboxType.basic;
#override
void initState() {
super.initState();
if (widget.items.isNotEmpty) {
_selectedTitles.add(widget.items[1]);
}
}
void _onItemSelect(bool selected, int index) {
if (selected == true) {
setState(() {
_selectedTitles.add(widget.items[index]);
_selectedTitlesIndex.add(index);
});
} else {
setState(() {
_selectedTitles.remove(widget.items[index]);
_selectedTitlesIndex.remove(index);
});
}
}
#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: Row(
children: [
SvgPicture.asset(constants.Assets.carDropdown),
const SizedBox(width: 8),
_selectedTitles.length > 1
? const Text('Selecte EV',
style: constants.Styles.xSmallLtStdTextStyleWhite)
: 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();
},
),
),
);
}
}

Answer 1

Create a class such as MultiDropDownBox and pass a required bool in constructor such as isCheckBox . Return the required widget as per bool value.
Example code snippet
class MultiDropdownBox extends StatefulWidget {
final bool isCheckbox;
MultiDropdownBox(
{Key? key,
required this.isCheckBox,
})
: super(key: key);
#override
State<MultiDropdownBox> createState() => _MultiDropdownBoxState();
}
class _MultiDropdownBoxState extends State<MultiDropdownBox> {
bool isChecked = widget.isChecked;
#override
Widget build(BuildContext context) {
if(isChecked){return CheckboxDropdown()};
else{return DropdownWidget()}
}
Upvote if it helped :)