Based on your question, hereโs what I understand:
- You have a main screen this screen has
ButtomNavigationBar
- You want to navigate to a Widget not in the
pages List of this BottomNavigationBar
- You want to navigate to this
Widget using a component (lets say Button in the HomeScreen)
- You want the
BottomNavigationBar to remain visible on this new widget (DetailsScreen).
- You want to show back the main screens (
HomeScreen, CartScreen, ProfileScreen) from this widget.
=>This is a demo video for the provided solution : CustomNavigationBar_Flutter
If this is correct, Iโll provide this solution. Please Let me know if I misunderstood!
The solution Iโm providing is not ideal but works for your use case. If you meant something else, please let me know!
Step 1: Define a Model for Each Screen
class MyScreensModel {
final String? title;
final Widget targetWidget;
final IconData icon;
const MyScreensModel({
required this.icon,
required this.targetWidget,
this.title,
});
}
You can define the properties you want in this Model (It is up to you)
Step 2: Build the Pages Screens
define the screens you want to display. Lets say:
it is a HomeScreen(), CartScreen(), ProfileScreen() and DetailsScreen() do not worry about ChangeNotifierProvider
const TextStyle style = TextStyle(
fontSize: 20,
fontWeight: FontWeight.bold,
);
class CartScreen extends StatelessWidget {
const CartScreen({super.key});
@override
Widget build(BuildContext context) {
return const Text(
"Cart Screen Content",
style: style,
);
}
}
class HomeScreen extends StatelessWidget {
const HomeScreen({super.key});
@override
Widget build(BuildContext context) {
return const Text(
"Home Screen Content",
style: style,
);
}
}
class ProfileScreen extends StatelessWidget {
const ProfileScreen({super.key});
@override
Widget build(BuildContext context) {
return const Text(
"Profile Screen Content",
style: style,
);
}
}
class DetailsScreen extends StatelessWidget {
const DetailsScreen({super.key});
@override
Widget build(BuildContext context) {
return ChangeNotifierProvider(
create: (context) => CurrentScreenProvider(),
child: const Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
FlutterLogo(
size: 200,
),
Text(
"Details Screen Content",
style: style,
),
],
),
);
}
}
Step 3: Store Screens in a List
Then Store it in List<MyScreensModel> and add the data you want
List<MyScreensModel> navigationScreens = const <MyScreensModel>[
MyScreensModel(
icon: Icons.home,
targetWidget: HomeScreen(),
title: "Home",
),
MyScreensModel(
icon: Icons.shopping_bag,
targetWidget: CartScreen(),
title: "Cart",
),
MyScreensModel(
icon: Icons.person,
targetWidget: ProfileScreen(),
title: "Profile",
),
MyScreensModel(
icon: Icons.info,
targetWidget: DetailsScreen(),
),
];
Step 4: Use Provider for StateManagement
In this step we will need a very powerful package for managing this CustomNavigationBar provider
we will create a Provider to trigger the index of current screen and change this value when the user tap the Item
class CurrentScreenProvider with ChangeNotifier {
int _currentScreen = 0;
int get currentScreen => _currentScreen;
// To control the BottomNavigationBar Items
void selectScreen({
required int newScreen,
}) {
_currentScreen = newScreen;
notifyListeners();
}
// To control the DetailsScreen
void get selectDetialsScreen {
_currentScreen = 3;
notifyListeners();
}
bool get isDetails => currentScreen == 3;
}
the bool isDetails for check if we in the DetailsScreen() or not
Step 5: Create the Custom Bottom Navigation Bar
After that we will create our CustomBottomNavigationBar() Widget
class CustomNavBar extends StatelessWidget {
const CustomNavBar({
super.key,
});
@override
Widget build(BuildContext context) {
return Consumer<CurrentScreenProvider>(
builder: (context, screen, _) {
return Container(
height: MediaQuery.sizeOf(context).height * .09,
decoration: const BoxDecoration(
borderRadius: BorderRadius.vertical(
top: Radius.circular(15),
),
color: Color(0xFFECFFE6),
),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: List.generate(
navigationScreens.length - 1,
(int index) {
return CustomNavbarItemWidget(
isSelected: index == screen.currentScreen,
targetScreen: navigationScreens[index],
onNavTap: () {
// Tapping on the Item will update the value of the currentScreen
screen.selectScreen(newScreen: index);
},
);
},
),
),
);
},
);
}
}
As you can see we will create a BottomNavigationBar as Row inside a Container you can consider the decoration of the Container as navbr decoration
Step 6: Create the Bottom Navigation Bar Item
class CustomNavbarItemWidget extends StatelessWidget {
const CustomNavbarItemWidget({
super.key,
required this.isSelected,
required this.targetScreen,
required this.onNavTap,
});
final bool isSelected;
final MyScreensModel targetScreen;
final void Function() onNavTap;
@override
Widget build(BuildContext context) {
return Container(
width: MediaQuery.sizeOf(context).width * .16,
margin: const EdgeInsets.all(5.0),
decoration: BoxDecoration(
color: isSelected ? Color(0xFFC7FFD8) : null,
borderRadius: BorderRadius.circular(10),
),
child: Material(
color: Colors.transparent,
child: InkWell(
borderRadius: BorderRadius.circular(10),
onTap: onNavTap,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Icon(targetScreen.icon),
if (isSelected) ...{
Text(
targetScreen.title!,
style: const TextStyle(
fontWeight: FontWeight.bold,
),
),
}
],
),
),
),
);
}
}
As you can see you can control the decoration of the selected item using isSelected bool
And the next widget will be the mainScreen that has the pages Screen
I will consider that you will show the DetailsScreen() using the floatingActionButton
class MyScreen extends StatelessWidget {
const MyScreen({super.key});
Widget _targetWidget({
required BuildContext context,
}) {
final CurrentScreenProvider screen = Provider.of<CurrentScreenProvider>(
context,
listen: false,
);
int currentScreen = screen.currentScreen;
switch (currentScreen) {
case 0:
{
return const HomeScreen();
}
case 1:
{
return const CartScreen();
}
case 2:
{
return const ProfileScreen();
}
case 3:
{
return const DetailsScreen();
}
default:
{
return const HomeScreen();
}
}
}
@override
Widget build(BuildContext context) {
return ChangeNotifierProvider(
create: (context) {
return CurrentScreenProvider();
},
child: Consumer<CurrentScreenProvider>(
builder: (context, screen, _) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: Scaffold(
appBar: AppBar(
automaticallyImplyLeading: false,
centerTitle: true,
backgroundColor: screen.isDetails ? Colors.cyan : Colors.green,
title: Text(
screen.isDetails
? "DetailsScreen AppBar Title"
: "MainScreen AppBar Title",
style: const TextStyle(
fontWeight: FontWeight.bold,
),
),
),
body: Center(
child: _targetWidget(context: context),
),
bottomNavigationBar: const CustomNavBar(),
floatingActionButton: screen.isDetails
? null
: FloatingActionButton(
child: const Icon(Icons.info),
onPressed: () {
screen.selectDetialsScreen;
},
),
),
);
},
),
);
}
}
As you can see that the _targetWidget is show the content according to the currentScreen from the CurrentScreenProvider
Full Code :
class MyScreensModel {
final String? title;
final Widget targetWidget;
final IconData icon;
const MyScreensModel({
required this.icon,
required this.targetWidget,
this.title,
});
}
class CartScreen extends StatelessWidget {
const CartScreen({super.key});
@override
Widget build(BuildContext context) {
return const Text(
"Cart Screen Content",
style: style,
);
}
}
class HomeScreen extends StatelessWidget {
const HomeScreen({super.key});
@override
Widget build(BuildContext context) {
return const Text(
"Home Screen Content",
style: style,
);
}
}
class ProfileScreen extends StatelessWidget {
const ProfileScreen({super.key});
@override
Widget build(BuildContext context) {
return const Text(
"Profile Screen Content",
style: style,
);
}
}
class DetailsScreen extends StatelessWidget {
const DetailsScreen({super.key});
@override
Widget build(BuildContext context) {
return ChangeNotifierProvider(
create: (context) => CurrentScreenProvider(),
child: const Text(
"Details Screen Content",
style: style,
),
);
}
}
const TextStyle style = TextStyle(
fontSize: 20,
fontWeight: FontWeight.bold,
);
List<MyScreensModel> navigationScreens = const <MyScreensModel>[
MyScreensModel(
icon: Icons.home,
targetWidget: HomeScreen(),
title: "Home",
),
MyScreensModel(
icon: Icons.shopping_bag,
targetWidget: CartScreen(),
title: "Cart",
),
MyScreensModel(
icon: Icons.person,
targetWidget: ProfileScreen(),
title: "Profile",
),
MyScreensModel(
icon: Icons.info,
targetWidget: DetailsScreen(),
),
];
class CurrentScreenProvider with ChangeNotifier {
int _currentScreen = 0;
int get currentScreen => _currentScreen;
// To control the BottomNavigationBar Items
void selectScreen({
required int newScreen,
}) {
_currentScreen = newScreen;
notifyListeners();
}
// To control the DetailsScreen
void get selectDetialsScreen {
_currentScreen = 3;
notifyListeners();
}
bool get isDetails => currentScreen == 3;
}
class MyScreen extends StatelessWidget {
const MyScreen({super.key});
Widget _targetWidget({
required BuildContext context,
}) {
final CurrentScreenProvider screen = Provider.of<CurrentScreenProvider>(
context,
listen: false,
);
int currentScreen = screen.currentScreen;
switch (currentScreen) {
case 0:
{
return const HomeScreen();
}
case 1:
{
return const CartScreen();
}
case 2:
{
return const ProfileScreen();
}
case 3:
{
return const DetailsScreen();
}
default:
{
return const HomeScreen();
}
}
}
@override
Widget build(BuildContext context) {
return ChangeNotifierProvider(
create: (context) {
return CurrentScreenProvider();
},
child: Consumer<CurrentScreenProvider>(
builder: (context, screen, _) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: Scaffold(
appBar: AppBar(
automaticallyImplyLeading: false,
centerTitle: true,
backgroundColor: Colors.green,
title: const Text(
"Custom Navigation Bar",
style: TextStyle(
fontWeight: FontWeight.bold,
),
),
),
body: Center(
child: _targetWidget(context: context),
),
bottomNavigationBar: const CustomNavBar(),
floatingActionButton: screen.isDetails
? null
: FloatingActionButton(
child: const Icon(Icons.info),
onPressed: () {
screen.selectDetialsScreen;
},
),
),
);
},
),
);
}
}
class CustomNavBar extends StatelessWidget {
const CustomNavBar({
super.key,
});
@override
Widget build(BuildContext context) {
return Consumer<CurrentScreenProvider>(
builder: (context, screen, _) {
return Container(
height: MediaQuery.sizeOf(context).height * .09,
decoration: const BoxDecoration(
borderRadius: BorderRadius.vertical(
top: Radius.circular(15),
),
color: Color(0xFFECFFE6),
),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: List.generate(
navigationScreens.length - 1,
(int index) {
return CustomNavbarItemWidget(
isSelected: index == screen.currentScreen,
targetScreen: navigationScreens[index],
onNavTap: () {
// When the user tap on the Item it will update the value of the currentScreen
screen.selectScreen(newScreen: index);
},
);
},
),
),
);
},
);
}
}
class CustomNavbarItemWidget extends StatelessWidget {
const CustomNavbarItemWidget({
super.key,
required this.isSelected,
required this.targetScreen,
required this.onNavTap,
});
final bool isSelected;
final MyScreensModel targetScreen;
final void Function() onNavTap;
@override
Widget build(BuildContext context) {
return Container(
width: MediaQuery.sizeOf(context).width * .16,
margin: const EdgeInsets.all(5.0),
decoration: BoxDecoration(
color: isSelected ? Colors.cyan.withOpacity(0.2) : null,
borderRadius: BorderRadius.circular(10),
),
child: Material(
color: Colors.transparent,
child: InkWell(
borderRadius: BorderRadius.circular(10),
onTap: onNavTap,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Icon(targetScreen.icon),
if (isSelected) ...{
Text(
targetScreen.title!,
style: const TextStyle(
fontWeight: FontWeight.bold,
),
),
}
],
),
),
),
);
}
}
