draw method
Implementation
@override
void draw(Canvas canvas, double space, double size, double radius) {
final progress = page - index;
final distance = size + space;
final start = index * (size + space);
if (progress > 0.5) {
final right = start + size + distance;
//progress=>0.5-1.0
//left:0.0=>distance
final left = index * distance + distance * (progress - 0.5) * 2;
canvas.drawRRect(
RRect.fromLTRBR(left, 0.0, right, size, Radius.circular(radius)),
_paint);
} else {
final right = start + size + distance * progress * 2;
canvas.drawRRect(
RRect.fromLTRBR(start, 0.0, right, size, Radius.circular(radius)),
_paint);
}
}