Would like get current status of 'autorotate' system setting in Flutter application. Need to identify weather it is ON or OFF.
This can be done in android with the answer mentioned in the stackoverflow question.
Android auto rotate on off status link. But need the same with Flutter which should work for both android and ios.
Apricates your suggestion.
To know the Orientation of the screen, you can use the OrientationBuilder Widget, it will determine the current Orientation and rebuild when the Orientation changes its state.
#override
Widget build(BuildContext context) {
return Scaffold(
body: OrientationBuilder(builder: (_, orientation) {
if (orientation == Orientation.portrait)
return Something(); // if orientation is portrait, do something
else
return Something(); // else do something
}),
);
}
Related
How to make able to scroll listview inside SingleChildScrollView?
That's right, normally the list view scrolls even if the parent is a SingleChildScrollView.
But my case is special because I used
NotificationListener<ScrollNotification>(
onNotification: (ScrollNotification notification) {
if (notification is UserScrollNotification) {
if (notification.direction == ScrollDirection.forward) {
//trigger doing some event ...
...changing screen because of this event
So my Listview scrolling is absolutely doing nothing and changing the screen because of the parent event.
child: ListView.builder( ... // when scroll it doesn`t scroll and change screen because of parent
Can anyone solve this?
I think you have not provided the physics property for the list view:
Use -> physics:AlwaysScrollableScrollPhysics() for the listview to make it scrollable.
I want to force portrait mode in my app, I am using the settings below. However I have a view, that I must enable landscape on, is there way for this to only work on all views except specific one that I want? I don't want to paste this in every widget throughout the app.
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
SystemChrome.setPreferredOrientations([
DeviceOrientation.portraitUp,
DeviceOrientation.portraitDown,
]);
On the view I want landscape, I have an if that checks if the view is landscape or portrait, but it wont render to landscape with settings above.
Let's say your app is completely in "Portrait". What you had will work. Now, you want a specific screen to be either portrait/landscape or only landscape. Then you can configure separately for that one screen (say Screen2).
You are in Screen1 and want to go to Screen2 (which should be in landscape).
// screen2
#override
void initState(){
super.initState();
setLandscape(); // set to portrait
}
#override
dispose(){
setPortrait(); // set to portrait
super.dispose();
}
// function changes to landscape
setLandscape() {
SystemChrome.setPreferredOrientations([
DeviceOrientation.landscapeRight,
DeviceOrientation.landscapeLeft,
// below 2 lines are based on your requirement
DeviceOrientation.portraitUp,
DeviceOrientation.portraitDown,
]);
}
// function changes to portrait
setPortrait() {
SystemChrome.setPreferredOrientations([
DeviceOrientation.portraitUp,
DeviceOrientation.portraitDown,
]);
}
If you don't have to navigate to new screen, this would work fine
But problem would be when navigating to the Screen3 from Screen2 where Screen3 should be portrait (not landscape). You can change it when navigating and revert it back to landscape when popping.
// screen2
// navigates safely to next screen changing to portrait and
// reverts to landscape when popped to this screen
navigateTo(<navigate screen>) {
setPortrait();
Navigator.of(context)
.push(<navigate screen>)
.then(() => setLandscape()); // then completes when pop() returns to this page
}
My main screen has got AppBar and BottomNavigationBar. if I navigate to screen 2 BottomNavigationBar is staying. It is perfect for me.
But I would like to remove the Tabbar for screen 2. Because the content of Screen 2 is irrelevant with the TabbarMenu.
I am going to screen 2 from screen 1 return Page2 like this:
Widget showPage(int selectedPage) {
if (selectedPage == 0) {
return const NewsView(id: '1');
} else if (selectedPage == 1) {
return const Settings();
any help?
I want to know the direction of scrolling at the moment of scrolling up or down in the list view. but I couldn't find a solution.
I tried to use ScrollController to listen to the direction of scrolling for dealing with different work as up and down scrolls. But there is no way to listen to that with ScrollController.
Is there anyone to have dealt with this problem?
You can make use of NotificationListener<ScrollNotification>. You will need to wrap your scroll view in that widget and then listen to UserScrollNotifications:
NotificationListener<ScrollNotification>(
onNotification: (ScrollNotification notification) {
if (notification is UserScrollNotification) {
if (notification.direction == ScrollDirection.forward) {
// Handle scroll down.
} else if (notification.direction == ScrollDirection.reverse) {
// Handle scroll up.
}
}
// Returning null (or false) to
// "allow the notification to continue to be dispatched to further ancestors".
return null;
},
child: ListView(..), // Or whatever scroll view you use.
)
I am trying to dismiss the keyboard when the user swipes from the edge to pop route.
Currently the keyboard doesn't dismiss until the route is completely gone popped, messing up some of the other pages layout until it dismisses
I did try to use a WillPopScope to determine when the user was going to pop the route, but unfortunately this disables the swipe to pop functionality from iOS or the CupertinoPageRoute.
I just want to find out if there's anyway I can determine when the user swipes from the edge to pop or taps the back button on the appBar and dismiss the keyboard as they do so.
If possible, I am trying to dismiss keyboard as soon as they start swiping to pop, as it happens in many apps.
I am attaching attaching a gif showing the effect I'm trying to achieve.
As suggested by Ovidiu
class DismissKeyboardNavigationObserver extends NavigatorObserver {
#override
void didStartUserGesture(Route route, Route previousRoute) {
SystemChannels.textInput.invokeMethod('TextInput.hide');
super.didStartUserGesture(route, previousRoute);
}
}
and in your Material App
MaterialApp(
navigatorObservers: [DismissKeyboardNavigationObserver()],
)
You need to create a custom class extending NavigatorObserver, and pass an instance of it to the navigatorObservers property of your MaterialApp or CupertinoApp.
Within that custom class, you can override didStartUserGesture and didStopUserGesture, which will be called when the swipe gesture starts/ends. This should allow you to achieve the behavior you are looking for. Note that didStartUserGesture indicates the current route as well as the previous route, based on which you could add logic to determine whether the keyboard should be dismissed or not.
This should come naturally and you shouldn't be directly concerned with that because actually, when you pop a route with the keyboard on, it should dismiss properly.
However, if you want to detect when the user starts swiping and dismiss the keyboard along with it and then pop the current route, you can easily achieve it by wrapping your screen widget with a GestureDetector like so:
Widget build(BuildContext context) {
double dragStart = 0.0;
return GestureDetector(
onHorizontalDragStart: (details) => dragStart = details.globalPosition.dx,
onHorizontalDragUpdate: (details) {
final double screenWidth = MediaQuery.of(context).size.width;
// Here I considered a back swipe only when the user swipes until half of the screen width, but you can tweak it to your needs.
if (dragStart <= screenWidth * 0.05 && details.globalPosition.dx >= screenWidth) {
FocusScope.of(context).unfocus();
}
child: // Your other widgets...
},
this is something i wrote to handle this issue. doesnt use any external packages, you would just wrap your content in the main function at the top.
Widget swipeOffKeyboard(BuildContext context, {Widget? child}) {
return Listener(
onPointerMove: (PointerMoveEvent pointer) {
disKeyboard(pointer, context);
},
child: child, // your content should go here
);
}
void disKeyboard(PointerMoveEvent pointer, BuildContext context) {
double insets = MediaQuery.of(context).viewInsets.bottom;
double screenHeight = MediaQuery.of(context).size.height;
double position = pointer.position.dy;
double keyboardHeight = screenHeight - insets;
if (position > keyboardHeight && insets > 0) FocusManager.instance.primaryFocus?.unfocus();
}