[Question] Why is this behaviour happening?

[JosephKorel]

Hi, awesome library!

I have a widget that is like a checkbox. And I wanted to use scale effect, when is checked, the Check icon scales to 1.8, and when is unchecked, it scales down to 0. I created a StatelessWidget, passed the offset values as something like Offset(x: active? 1.8 : 0)..., and target: active ? 1 : 0b But the animation would only run when I tapped the button and active was true.

So I created a StatefulWidget and this is my animate:

            target: widget.active ? 1 : 0,
            effects: [
              ScaleEffect(
                duration: .4.seconds,
                curve: Curves.easeInOut,
                begin: Offset.zero,
                end: const Offset(
                  1.8,
                  1.8,
                ),
              ),
            ],
            child: Icon(
              Icons.check,
              color: widget.active ? context.surface : context.onSurface,
              size: 12,
            ),
          ),

I didn't specify a the scale down effect, but when active is false, the animation is running backwards, so it is scalling down as i wanted. It's great that it's working but i don't really understand why.