If someone is looking for a page indicator as well.
DotsIndicator({
this.controller,
this.itemCount,
this.onPageSelected,
this.color: Colors.white,
}) : super(listenable: controller);
/// The PageController that this DotsIndicator is representing.
final PageController controller;
/// The number of items managed by the PageController
final int itemCount;
/// Called when a dot is tapped
final ValueChanged<int> onPageSelected;
/// The color of the dots.
///
/// Defaults to `Colors.white`.
final Color color;
// The base size of the dots
static const double _kDotSize = 8.0;
// The increase in the size of the selected dot
static const double _kMaxZoom = 2.0;
// The distance between the center of each dot
static const double _kDotSpacing = 25.0;
Widget _buildDot(int index) {
double selectedness = Curves.easeOut.transform(
max(
0.0,
1.0 - ((controller.page ?? controller.initialPage) - index).abs(),
),
);
double zoom = 1.0 + (_kMaxZoom - 1.0) * selectedness;
return new Container(
width: _kDotSpacing,
child: new Center(
child: new Material(
color: color,
type: MaterialType.circle,
child: new Container(
width: _kDotSize * zoom,
height: _kDotSize * zoom,
child: new InkWell(
onTap: () => onPageSelected(index),
),
),
),
),
);
}
Widget build(BuildContext context) {
return new Row(
mainAxisAlignment: MainAxisAlignment.center,
children: new List<Widget>.generate(itemCount, _buildDot),
);
}
}
If someone is looking for a page indicator as well.
Reference