updateAnimatableParameters method
Updates the AnimatableParameters with the new values.
This is called when the widget is rebuilt.
Implementation
@override
void updateAnimatableParameters(_PositionedAnimatableParameters parameters) {
parameters
..left.value = left
..top.value = top
..right.value = right
..bottom.value = bottom
..width.value = width
..height.value = height;
}