Flutter for Beginners

The AnimatedBuilder class

The AnimatedBuilder widget exists so that we can build complex widgets that wish to include animation as part of a larger build function. Just like any other widget, it is included in the widgets tree and has a child property. Let's check its constructor:

const AnimatedBuilder({    Key key,    @required Listenable animation,    @required TransitionBuilder builder,    Widget child})

As you can see, we have a few important properties here, besides the well-known key property:

• animation: This is the proper animation as a Listenable object. Listenable is a type that holds a list of listeners and notifies them whenever the object changes. As you may already be thinking, AnimatedBuilder will listen for animation updates, so we do ...