The Flexible does the trick new Container( child: Row( children: <Widget>[ Flexible( child: new Text(“A looooooooooooooooooong text”)) ], )); This is the official doc https://flutter.dev/docs/development/ui/layout#lay-out-multiple-widgets-vertically-and-horizontally on how to arrange widgets. Remember that Flexible and also Expanded, should only be used within a Column, Row or Flex, because of the Incorrect use of ParentDataWidget. The solution … Read more
See the docs for num.toStringAsFixed(). String toStringAsFixed(int fractionDigits) Returns a decimal-point string-representation of this. Converts this to a double before computing the string representation. If the absolute value of this is greater or equal to 10^21 then this methods returns an exponential representation computed by this.toStringAsExponential(). Examples: 1000000000000000000000.toStringAsExponential(3); // 1.000e+21 Otherwise the result is the … Read more
To use auto wrap, just set maxLines as null: TextField( keyboardType: TextInputType.multiline, maxLines: null, ) If the maxLines property is null, there is no limit to the number of lines, and the wrap is enabled.
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)); }
.. is known as cascade notation. It allows you to not repeat the same target if you want to call several methods on the same object. List list = []; list.add(color1); list.add(color2); list.add(color3); list.add(color4); // with cascade List list = []; list ..add(color1) ..add(color2) ..add(color3) ..add(color4);
You can use the intl package (installer) to format dates. For en_US formats, it’s quite simple: import ‘package:intl/intl.dart’; main() { final DateTime now = DateTime.now(); final DateFormat formatter = DateFormat(‘yyyy-MM-dd’); final String formatted = formatter.format(now); print(formatted); // something like 2013-04-20 } There are many options for formatting. From the docs: ICU Name Skeleton ——– ——– … Read more
There is a post on dart’s website and it explains it pretty well. Final: “final” means single-assignment: a final variable or field must have an initializer. Once assigned a value, a final variable’s value cannot be changed. final modifies variables. Const: “const” has a meaning that’s a bit more complex and subtle in Dart. const … Read more
Thanks to Dart’s factory constructors, it’s easy to build a singleton: class Singleton { static final Singleton _singleton = Singleton._internal(); factory Singleton() { return _singleton; } Singleton._internal(); } You can construct it like this main() { var s1 = Singleton(); var s2 = Singleton(); print(identical(s1, s2)); // true print(s1 == s2); // true }