I want to implement a functionality where if an image is clicked, then it should navigate to a new page. Below code was working perfectly until recently when it showed me a squiggly red error underneath the function onImageTap.
child: new Carousel(
boxFit: BoxFit.cover,
images: list,
onImageTap: (imageIndex) {
Navigator.of(context).push(
new MaterialPageRoute(
builder: (context) => new DishDetails(
detail_name:
snapshot.data[imageIndex].data["title"],
detail_picture: snapshot
.data[imageIndex].data["image"]),
),
);
},
autoplay: false,
dotSize: 4.0,
indicatorBgPadding: 4.0,
animationCurve: Curves.fastOutSlowIn,
animationDuration: Duration(milliseconds: 1000),
)));
When I hover over the function, I get the following error message:
The named parameter onImageTap isn't defined. Try correcting the name
to an existing named parameter or defining a new parameter with this
name
Can someone tell me how I can resolve this issue.
As you mentioned it was working earlier, so I believe you are using some 3rd party package which have Carousel widget and in one of its previous versions it had onImageTap, you unknowingly updated the plugin and they must have removed it or replaced it with something else.
Solution:
So, you can either use the previous version which had onImageTap property or use something else for it.
You may want to wrap your Carousel in a GestureDetector and handle onTap like:
GestureDetector(
onTap: () {},
child: Carousel(...)
)
Related
im using better player and i want to build my own custom controls but i don't know what i have to do with this parameter customControlsBuilder: (controller, onPlayerVisibilityChanged) => this param onPlayerVisibilityChanged how do i use it?
here is my code, im using CustomControlsWidget from the documentation but there is no clues on how use this onPlayerVisibilityChanged
controlsConfiguration: BetterPlayerControlsConfiguration(
controlsHideTime: const Duration(milliseconds: 1000),
controlBarColor: Colors.black12,
playerTheme: BetterPlayerTheme.custom,
customControlsBuilder: (controller, onPlayerVisibilityChanged) =>
CustomControlsWidget(
controller: controller,
onControlsVisibilityChanged: onPlayerVisibilityChanged,
),
),
I moved to stable flutter channel from beta, after upgrading flutter,
I am getting error for ListTile() attributes and ScaffoldMassanger,
child: ListTile(
horizontalTitleGap: 10, // error
minVerticalPadding: 10, // error
),
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
content: Text('success'),
duration: Duration(seconds: 2),
));
I tried below solutions:
flutter upgrade
flutter clean
flutter pub get
reinstalled dart and flutter plugin in VSCode
flutter run
updated vscode
no success
error log after removing depreciated attributes,
lib/widgets/list_expense.dart:32:9: Error: The getter 'ScaffoldMessenger' isn't defined for the class '_ListExpenseState'.
'_ListExpenseState' is from 'package:XpenseTracker/widgets/list_expense.dart' ('lib/widgets/list_expense.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'ScaffoldMessenger'.
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
These properties have been removed, as can be seen in the class (ListTile) documentation:
https://api.flutter.dev/flutter/material/ListTile/ListTile.html
Please take a look at this package here, in order to use these properties:
https://pub.dev/packages/list_tile_more_customizable
[EDIT]
For your Scaffold issue please try to use a static helper function like so, then pass the string to render, along with the BuildContext:
static Future showSimpleSnackBar(
String message, GlobalKey<ScaffoldState> contextState) async {
final snackBar = SnackBar(
content: Text(message),
duration: Duration(seconds: 3),
action: SnackBarAction(
label: "Got it",
onPressed: () {
//invoke an action here...
},
),
);
contextState.currentState.removeCurrentSnackBar();
contextState.currentState.showSnackBar(snackBar);
}
Make sure as well that the BuildContext is coming from a Global ScaffoldKey, and that the scaffold will be responsible with rendering the snackbar.
How can i navigate from one page to another using gesture Detector ?
this is what i have done so far , i have also imported the login_page.dart but the gestureDetector is giving the error "undefined login_page"
GestureDetector(
onTap: () {
pageController.animateToPage(
login_page,
duration: Duration(milliseconds: 400),
curve: Curves.linear,
);
},
child: Text("GET STARTED NOW"),
),
Please use the below code in onTap: function. ***
Change the 4th line of the code.
GestureDetector(
onTap: () {
pageController.animateToPage(
HereIsTheClassNameOfYourPage(),//Please type the class name of your login_page class
duration: Duration(milliseconds: 400),
curve: Curves.linear,
);
},
child: Text("GET STARTED NOW"),
),
flutter dev also has a sample article for this
https://flutter.dev/docs/cookbook/animation/page-route-animation
Animates the controlled PageView from the current page to the given page.
The animation lasts for the given duration and follows the given curve. The returned Future resolves when the animation completes.
The duration and curve arguments must not be null.
Future animateToPage (
int page,
{#required Duration duration,
#required Curve curve}
)
Your GestureDetector syntax is correct but you passed wrong argument to animateToPage.
according the flutter api docs:
Future<void> animateToPage (
int page,
{#required Duration duration,
#required Curve curve}
)
this will Animate the controlled PageView from the current page to the given page.
Your login_page var must be a position of a page. you dont declare it correctly.
more information: animateToPage docs
Right now I am trying to delete data and when I am done delete it. It should be going to the homepage. The issue here is when I am using the navigator to the homepage. The user_id returns null instead of it should be showing the real user_id. How can I manage the flow of content?
Code that I use to go back 2 pages before.
new RaisedButton(
child: new Text("OK DELETE!",style: TextStyle(color: Colors.black),),
color: Colors.red,
onPressed: (){
deleteData();
Navigator.of(context).push(
MaterialPageRoute(
builder: (BuildContext context)=> OwnerPage())
);
},
),
The image on before deleting occur:
The image on after deleting occur:
For additional information. From the login page to the home page, I am using this type of code:
If you are using routes to navigate between pages you can do this
Navigator.pushNamed(context,'/OwnerPage');
this will directly navigate to the OwnerPage
Hope this is helpful!
There are different approaches to navigate between pages. The bad one is, you can Navigator.pop() two times. The good one is, you need to add parameters:
Navigator.of(context).push(
MaterialPageRoute(
builder: (BuildContext context)=> OwnerPage(username: username, user_id: user_id)) // Add parameters
);
I want to explain something in my app and add a widget which looks like a notification or chat. I want this widget to be visible for some time and then get dismissed. I tried using tooltip but it is visible only when I click it.
Which widget can I use?
The Dart package intro_views_flutter is what you need, but one of its main limitations is that it is displayed on full screen, if that is not an issue to you, then you should take a look at it. Or you can use a showDialog method inside a Future function this way :
Future showNotification() async {
showDialog<String>(
context: context,
child: new AlertDialog(
title: Text('Note!') ,
contentPadding: const EdgeInsets.all(16.0),
content: //any widget you want to display here
),
);
await new Future.delayed(const Duration(seconds: 5), () {
Navigator.of(context).pop(); // this will dismiss the dialog automatically after five seconds
}
}
then when you need it call:
showNotificaion();