I have a login screen, which I want to be accessible at different points throughout the app. Can I use that screen as a modal bottom sheet like this?
example from airbnb
Yes you can, the below code snippet is used to show bottomsheet:-
bottomSheetForSignIn(BuildContext context)
{
showModalBottomSheet(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.only(topLeft: Radius.circular(25),topRight: Radius.circular(25)),
),
isScrollControlled: true,
context: context,
builder: (context){
return SignIn();
}
);
}
and then create a stateful widget signin returning a container with a property height(to control like in how much part of screen you want to show bottom sheet)
Code for it will look like:-
class SignIn extends StatefulWidget {
const SignIn({Key? key}) : super(key: key);
#override
_SignInState createState() => _SignInState();
}
class _SignInState extends State<SignIn> {
#override
Widget build(BuildContext context) {
return Container(
height: MediaQuery.of(context).size.height*0.9,//to control height of bottom sheet
child: Column( //your design from here onwards
children: [
],
),
);
}
}
And whenever you want to open bottom sheet just make a call to:-
bottomSheetForSignIn(context);
Related
This issue is related with github #2502.
I am using GetMaterialApp from this package.
I'm not sure if this is a bug or not.
How to make the function in the first dialog useable by using Get.toNamed()?
It happened when using the Get.toNamed().
It works fine with Navigator.push() but I need Get.toNamed for the web app.
The first page has a button that will show the first dialog.
The first dialog will show the order type button list.
When pressing an order type button, the program will find a new order of this type and open the second page with a new order data.
The second page has some work to do and this work will open the second dialog.
After finishing this work, the user will click on the back button back to the first page and find a new order again.
The problem is when the second dialog works on the second page.
The first dialog on the first page will not work.
see video example.
web example.
code example:
import 'package:flutter/material.dart';
import 'package:flutter_test_exam_bug/config/path/page_path.dart';
import 'package:get/get.dart';
Future<void> _showMyDialog({required BuildContext context, required Widget child}) async {
return showDialog<void>(
context: context,
builder: (BuildContext context) => child,
);
}
class PageTest extends StatefulWidget {
const PageTest({Key? key}) : super(key: key);
#override
_PageTestState createState() => _PageTestState();
}
class _PageTestState extends State<PageTest> {
#override
Widget build(BuildContext context) {
Widget dialog_ = Center(
child: ElevatedButton(onPressed: () => Get.toNamed(PagePath.test2), child: const Text("Open second page"))),
openDialogButton_ = ElevatedButton(
onPressed: () => _showMyDialog(context: context, child: dialog_), child: const Text("Open first dialog"));
return Scaffold(body: SafeArea(child: Center(child: openDialogButton_)));
}
}
class PageTest2 extends StatefulWidget {
const PageTest2({Key? key}) : super(key: key);
#override
State<PageTest2> createState() => _PageTest2State();
}
class _PageTest2State extends State<PageTest2> {
ButtonStyle buttonStyle = ElevatedButton.styleFrom(primary: Colors.green);
#override
Widget build(BuildContext context) {
Widget dialog_ = Center(
child: ElevatedButton(
onPressed: () => Navigator.pop(context), child: const Text("I am second dialog"), style: buttonStyle)),
openDialogButton_ = ElevatedButton(
onPressed: () => _showMyDialog(context: context, child: dialog_),
child: const Text("Open second dialog"),
style: buttonStyle);
return Scaffold(appBar: AppBar(), body: SafeArea(child: Center(child: openDialogButton_)));
}
}
I think it is a bug.
When opening a dialog, the GETX ROUTE will change to the current page again.
Follow this in https://github.com/jonataslaw/getx/issues/2502
I want to create a universal alert that I will use several times in my app.
class SelectIconAlertDialogWidget extends StatelessWidget {
const SelectIconAlertDialogWidget({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
final model = Provider.of<IncomeViewModel>(context, listen: true).state;
return AlertDialog(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(40),
),
Problem is that I can not figure out how to pass type of parent ChangeNotifier
showDialog<String>(
context: context,
builder: (_) =>
ChangeNotifierProvider<IncomeViewModel>.value(
value: view,
child: const SelectIconAlertDialogWidget(),
),
);
I have a lot of ViewModels that will use this alert so dont want to repeat this code and write generic Alert that I can use with any ViewModel. How can I achieve this?
Create some abstract class with methods or fields you want to have for all your view models you use for that dialog
abstract class AbstractViewModel{
void doStuff();
}
Implement this class for your view models
class MyViewModel1 implements AbstractViewModel{
#override
void doStuff (){ print("from MyViewModel1");}
}
Add type parameter for your dialog class
class SelectIconAlertDialogWidget<T extends AbstractViewModel> extends StatelessWidget {
const SelectIconAlertDialogWidget({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
// and you can use generic type T like this:
final model = Provider.of<T>(context, listen: true);
model.doStuff();
return AlertDialog(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(40),
),
And call it passing type parameter SelectIconAlertDialogWidget<MyViewModel1>()
showDialog<String>(
context: context,
builder: (_) =>
ChangeNotifierProvider<MyViewModel1>.value(
value: view,
child: const SelectIconAlertDialogWidget<MyViewModel1>(),
),
);
On build method of your dialog widget it will print "from MyViewModel1". Hope you got the concept of abstraction.
I don't know if I used correct terms in the title. I meant share by being displayed in diffrent pages with the same state, so that even if I push a new page, the “shared” widget will stay the same.
I'm trying to share the same widget across several pages, like the navigation bar of facebook.com.
As I know, Navigator widget allows to build up a seperate route. I've attempted to use the widget here, and it works quite well.
...
Scaffold(
body: Stack(
children: [
Navigator(
key: navigatorKey,
onGenerateRoute: (settings) {
return MaterialPageRoute(
settings: settings,
builder: (context) => MainPage());
},
// observers: <RouteObserver<ModalRoute<void>>>[ routeObserver ],
),
Positioned(
bottom: 0,
child: BottomBarWithRecord(),
)
],
));
...
To summarize the situation, there used to be only one root Navigator (I guess it's provided in MaterialApp, but anyway), and I added another Navigator in the route under a Stack (which always display BottomBarWithRecord).
This code works perfect as I expected, that BottomBarWithRecord stays the same even if I open a new page in that new Navigator. I can also open a new page without BottomBarWithRecord by pushing the page in the root Navigator: Navigator.of(context, rootNavigator: true).push(smthsmth)
However, I couldn't find a way to change BottomBarWithRecord() as the route changes, like the appbar of facebook.com.
What I've tried
Subscribe to route using navigator key
As I know, to define a navigator key, I have to write final navigatorKey = GlobalObjectKey<NavigatorState>(context);. This doesn't seem to have addListener thing, so I couldn't find a solution here
Subscribe to route using navigator observer
It was quite complicated. Normally, a super complicated solutions works quite well, but it didn't. By putting with RouteAware after class ClassName, I could use some functions like void didPush() {} didPop() didPushNext to subscribe to the route. However, it was not actually "subscribing" to the route change; it was just checking if user opened this page / opened a new page from this page / ... , which would be complicated to deal with in my situation.
React.js?
When I learned a bit of js with React, I remember that this was done quite easily; I just had to put something like
...
const [appBarIndex, setAppBarIndex] = useState(0);
//0 --> highlight Home icon, 1 --> highlight Chats icon, 2 --> highlight nothing
...
window.addEventListener("locationChange", () => {
//location is the thing like "/post/postID/..."
if (window.location == "/chats") {
setAppBarIndex(1);
} else if (window.location == "/") {
setAppBarIndex(0);
} else {
setAppBarIndex(2);
}
})
Obviously I cannot use React in flutter, so I was finding for a similar easy way to do it on flutter.
How can I make the shared BottomBarWithRecord widget change as the route changes?
Oh man it's already 2AM ahhhh
Thx for reading this till here, and I gotta go sleep rn
If I've mad e any typo, just ignore them
You can define a root widget from which you'll control what screen should be displayed and position the screen and the BottomBar accordingly. So instead of having a Navigator() and BottomBar() inside your Stack, you'll have YourScreen() and BottomBar().
Scaffold(
body: SafeArea(
child: Stack(
children: [
Align(
alignment: Alignment.topCenter,
child: _buildScreen(screenIndex),
),
Align(
alignment: Alignment.bottomCenter,
child: BottomBar(
screenIndex,
onChange: (newIndex) {
setState(() {
screenIndex = newIndex;
});
},
),
),
],
),
),
)
BotttomBar will use the screenIndex passed to it to do what you had in mind and highlight the selected item.
_buildScreen will display the corresponding screen based on screenIndex and you pass the onChange to your BottomBar so that it can update the screen if another item was selected. You won't be using Navigator.of(context).push() in this case unless you want to route to a screen without the BottomBar. Otherwise the onChange passed to BottomBar will be responsible for updating the index and building the new screen.
This is how you could go about it if you wanted to implement it yourself. This package can do what you want as well. Here is a simple example:
class Dashboard extends StatefulWidget {
const Dashboard({Key? key}) : super(key: key);
#override
State<Dashboard> createState() => _DashboardState();
}
class _DashboardState extends State<Dashboard> {
final PersistentTabController _controller = PersistentTabController(initialIndex: 0);
#override
Widget build(BuildContext context) {
return PersistentTabView(
context,
controller: _controller,
screens: _buildScreens(),
items: _navBarsItems(),
);
}
List<Widget> _buildScreens() {
return [
const FirstScreen(),
const SecondScreen(),
];
}
List<PersistentBottomNavBarItem> _navBarsItems() {
return [
PersistentBottomNavBarItem(
icon: const Icon(Icons.home),
title: ('First Screen'),
),
PersistentBottomNavBarItem(
icon: const Icon(Icons.edit),
title: ('Second Screen'),
),
];
}
}
class FirstScreen extends StatelessWidget {
const FirstScreen({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return const Center(
child: Text('First Screen'),
);
}
}
class SecondScreen extends StatelessWidget {
const SecondScreen({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return const Center(
child: Text('Second Screen'),
);
}
}
So I am trying to create a custom widget in flutter that has multiple constructors.
Essentially I am creating an arrow button but want to be able to create the button with arrow icons facing in different directions.
Currently my code looks like this:
class RotateButton extends StatefulWidget {
RotateButton.left() {
_RotateButtonState createState() => _RotateButtonState.left();
}
RotateButton.right() {
_RotateButtonState createState() => _RotateButtonState.right();
}
#override
_RotateButtonState createState() => _RotateButtonState();
}
class _RotateButtonState extends State<RotateButton> {
IconData icon;
_RotateButtonState();
_RotateButtonState.left() {
icon = Icons.arrow_back;
}
_RotateButtonState.right() {
icon = Icons.arrow_forward;
}
#override
Widget build(BuildContext context) {
return Container(
decoration: BoxDecoration(
color: kPrimaryColor,
borderRadius: BorderRadius.circular(20),
),
child: Padding(
padding: const EdgeInsets.all(15.0),
child: Icon(
icon,
size: 70,
),
),
);
}
}
Every time I use my widget it just defaults to the default constructor and shows no Icon child.
Is there a way to build a class without making a default constructor.
Also is there a way I can build this widget without using a stateful widget as it kind of just overcomplicates it.
I am getting a message that says:
The declaration 'createState' isn't referenced
This message is coming up next to the named constructors in the rotatebutton class.
Any help is very much appreciated.
Use something like this:
class SomeWidget extends StatelessWidget {
final bool isRight;
const SomeWidget({Key key, this.isRight}) : super(key: key);
#override
Widget build(BuildContext context) {
return Container(
child: Icon(isRight?Icons.arrow_forward:Icons.arrow_back),
);
}
}
I'm trying to create a master-detail type container starting with a column of ListTiles on the left side of the screen. When a user taps on an item, a preset URL will then be displayed on the rest of the screen. Tapping a different item displays a different preset URL.
I've looked at the Flutter WebView Plugin and and webview_flutter packages, but either I don't understand them well enough (quite possible!) or they can't yet do everything I want them to to do.
Beside what I just mentioned, if possible I'd also like the web pages to open zoomed to fit the space they're in, but still be pinchable to other sizes.
p.s. I'm new to Flutter and am also confused about widget construction and memory management. If I try using something like a WebView widget, I don't know whether I just code a WebView widget every time I want to open a page, or if I somehow create a single WebView widget, add a controller, and code .loadFromUrl() methods.
You can create a Row with two children. First children will be ListView that will be consisted of ListTiles. Second children will be the WebView. When a user taps on the list tile, load the url with the controller. There is no need to rebuild the WebView every time in your case
Example by using webview_flutter:
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
WebViewController _controller;
List pages = ["https://google.com", "https://apple.com"];
#override
Widget build(BuildContext context) {
return Scaffold(
body: Row(
children: <Widget>[
Container(
width: 300,
child: ListView.builder(
itemCount: pages.length,
itemBuilder: (BuildContext context, int index) {
return ListTile(
title: Text(pages[index]),
onTap: () {
if (_controller != null) {
_controller.loadUrl(pages[index]);
}
},
);
},
),
),
Expanded(
child: WebView(
onWebViewCreated: (WebViewController c) {
_controller = c;
},
initialUrl: 'https://stackoverflow.com',
),
),
],
));
}
}
Just wrap the webview inside a SizedBox
SizedBox(
height: 300,
child: WebView()
)