layoutPages horizontal question

[a13020796019]

First of all, thank you for providing such an excellent plugin.
I have a problem with horizontal layout.
1.
The client's requirement is that when sliding horizontally to turn pages, the page should automatically go to the next page after turning halfway, otherwise it should stay on the current page.
The original effect is to stay in the current window.

> onHorizontalDragEnd: (details) {
> double screenWidth = MediaQuery.of(context).size.width;
> double dragDistance = _dragEndX - _dragStartX;
> if (dragDistance > screenWidth * 2 / 3) {
> print('previousPage $dragDistance');
> controller.goToPage(
> pageNumber: controller.pageNumber! - 1);
> } else if (dragDistance < screenWidth * 2 / 3) {
> print('nextPage $dragDistance');
> controller.goToPage(
> pageNumber: controller.pageNumber! + 1);
> } else {
> print('currentPage $dragDistance');
> 
> controller.goToPage(pageNumber: controller.pageNumber!);
> }
> },
> 

2.There is another problem. After the page is reduced to 1.0, it is not allowed to be reduced again.I tried changing constrained to true, but it caused other problems。This is how I currently do it。
But the effect is that it shrinks first and then restores. I haven't found a suitable solution.

                  onInteractionUpdate: (details) {
                    if (details.scale < 1.0) {
                      controller.setZoom(Offset.zero, 1.0);
                    }
                  },