Flutter for Beginners

Defining a widget

To start with, we typically define a widget, to maintain a minimal level of organization. We define the PieChart widget here; this will be a StatelessWidget descendant. This widget should abstract the paint layer and expose just what is needed by other widgets. In our case, this is what the PieChart properties look like:

class PieChart extends StatelessWidget {  final List<int> values;  final List<Color> colors;  ...}

The only properties that describe the widget are values and colors:

• values: This List represents each of the section values. Here, we use int values for simplicity, but it could be any type to work with any logic.
• colors: This List contains the colors that should be used to paint each of the sections in the ...