Looking into Dart a year later and I don't see any comprehensive widget library. I saw KevMoo's Widget.Dart project on GitHub but none of the widgets actually seem to work. I currently use AngularJS for my projects and have a great set of libraries such as Boostrap UI, and ng-grid which allow me to be productive without recreating the wheel. Anything like this in Dart?
Widgets are the central class hierarchy in the Flutter framework. A widget is an immutable description of part of a user interface. Widgets can be inflated into elements, which manage the underlying render tree. Widgets themselves have no mutable state (all their fields must be final).
We can create the custom widget in a new dart file with all the codes and defining the parameters that we need in the constructor. Here we will be discussing an example of how to build a simple app by applying custom property to the widgets and making them separate from their own properties.
In Flutter, everything is a widget. Widgets are just tiny chunks of UI that you can combine to make a complete app. Building an app Flutter is like building a lego set -- piece by piece. Widgets are nested inside of each other to build your app.
Types of Widgets: There are broadly two types of widgets in the flutter: Stateless Widget. Stateful Widget.
There are widget libraries but they are mostly work in progress.
polymer_elements Dart port of JS https://elements.polymer-project.org/
bwu_datagrid Dart port of JS SlickGrid
and probably others
Another one worth mentioning: http://www.material-design-lite.pub
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