There’s no notion of “Starts from max/min size”. The thing is, ContrainedBox only add constraints to it’s child. But in the end, it doesn’t pick a size. If you want your child to hit minSize, then they have to not expend. Which translate into not having a width/height of double.INFINITY. Fact is that double.INFINITY is … Read more
There is a global boolean kIsWeb which can tell you whether or not the app was compiled to run on the web. Documentation: https://api.flutter.dev/flutter/foundation/kIsWeb-constant.html import ‘package:flutter/foundation.dart’ show kIsWeb; if (kIsWeb) { // running on the web! } else { // NOT running on the web! You can check for additional platforms here. }
The key is the childAspectRatio. This value is use to determine the layout in GridView. In order to get the desired aspect you have to set it to the (itemWidth / itemHeight). The solution would be this: class MyHomePage extends StatefulWidget { MyHomePage({Key key, this.title}) : super(key: key); final String title; @override _MyHomePageState createState() => … Read more
Let’s examine some examples: var intList = <int>[1, 2, 3]; var dynamicList = intList as List<dynamic>; // Works. var intList2 = dynamicList as List<int>; // Works. But: var dynamicList = <dynamic>[1, 2, 3]; var intList = dynamicList as List<int>; // Fails at runtime. What’s the difference? In the first example, intList has a static type … Read more
so why didn’t they change the definition of creating a new instance which can be created const simply as const instead of new? If you mean why doesn’t final a = A(); automatically assume const A() if A has a const constructor: Sometimes it is automatic: const a = A(); in which case A‘s constructor … Read more
Avoid this whenever possible. It makes these widgets depends on each others and can make things harder to maintain in the long term. What you can do instead, is having both widgets share a common Listenable or something similar such as a Stream. Then widgets interact with each other by submitting events. For easier writing, … Read more
If you’re inside a Flutter Widget, you can use debugPrint, e.g., import ‘package:flutter/foundation.dart’; debugPrint(‘movieTitle: $movieTitle’); Or, use Dart’s built in log() function import ‘dart:developer’; log(‘data: $data’);
The QuerySnapshot class has a docs property, which then return a List<QueryDocumentSnapshot>. You can then access an index from this List which gives you a QueryDocumentSnapshot that you can then acess its .data() method to have a Map<String, dynamic>. Finally you can access any field from that. Try: snapshot.data.docs[index].data()[‘imageUrl’],
Flutter 2.0.2 showDatePicker( builder: (context, child) { return Theme( data: Theme.of(context).copyWith( colorScheme: ColorScheme.light( primary: Colors.yellow, // header background color onPrimary: Colors.black, // header text color onSurface: Colors.green, // body text color ), textButtonTheme: TextButtonThemeData( style: TextButton.styleFrom( foregroundColor: Colors.red, // button text color ), ), ), child: child!, ); }, ); }, );