The problem is having a Scaffold or not. Scaffold is a helper for Material apps (AppBar, Drawer, that sort of stuff). But you’re not forced to use Material. What you’re missing is an instance of DefaultTextStyle as a parent: DefaultTextStyle( style: TextStyle(…), child: Text(‘Hello world’), ) Various widgets add one to change the default text … Read more
I’m not sure I understand your question, but if you want the image to fill the entire screen you can use a DecorationImage with a fit of BoxFit.cover. class BaseLayout extends StatelessWidget{ @override Widget build(BuildContext context){ return Scaffold( body: Container( decoration: BoxDecoration( image: DecorationImage( image: AssetImage(“assets/images/bulb.jpg”), fit: BoxFit.cover, ), ), child: null /* add child … Read more
Definition: Invisible: The widget takes up physical space on the screen but is not visible to user. This can be achieved using Visibility widget. Gone: The widget doesn’t take up any physical space and is completely gone. This can be achieved using Visibility, if or if-else condition. Invisible example: Visibility( child: Text(“Invisible”), maintainSize: true, maintainAnimation: … Read more
You could use https://github.com/slightfoot/flutter_after_layout which executes a function only one time after the layout is completed. Or just look at its implementation and add it to your code 🙂 Which is basically void initState() { super.initState(); WidgetsBinding.instance .addPostFrameCallback((_) => yourFunction(context)); }
Adding this two lines ListView.builder( scrollDirection: Axis.vertical, shrinkWrap: true, …
Do it like this: TextField( decoration: new InputDecoration.collapsed( hintText: ‘Username’ ), ), or if you need other stuff like icon, set the border with InputBorder.none InputDecoration( border: InputBorder.none, hintText: ‘Username’, ), ),
The build method is designed in such a way that it should be pure/without side effects. This is because many external factors can trigger a new widget build, such as: Route pop/push Screen resize, usually due to keyboard appearance or orientation change The parent widget recreated its child An InheritedWidget the widget depends on (Class.of(context) … Read more
I think you may want to introduce some helper functions to build your button as well as a Stateful widget along with some property to key off of. Use a StatefulWidget/State and create a variable to hold your condition (e.g. isButtonDisabled) Set this to true initially (if that’s what you desire) When rendering the button, … Read more
(I assume you’re using a Row because you want to put other widgets beside the TextField in the future.) The Row widget wants to determine the intrinsic size of its non-flexible children so it knows how much space that it has left for the flexible ones. However, TextField doesn’t have an intrinsic width; it only … Read more
UPDATE: Scaffold.of(context).showSnackBar is deprecated in Flutter 2.0.0 (stable) You can access the parent ScaffoldMessengerState using ScaffoldMessenger.of(context). Then do something like ScaffoldMessenger.of(context).showSnackBar(SnackBar( content: Text(“Sending Message”), )); Snackbars are the official “Toast” from material design. See Snackbars. Here is a fully working example: import ‘package:flutter/material.dart’; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget … Read more