Summary:
Gengrid _item_show_region function calculate gengrid x, y moving postion with scroll to type.
Belows are summaries of this refactoring works.
1. Refactoring recalculation of scroll type.
2. Bug fix :
- when x or y is 0, y or x value is set as default value, it->position-1.
- when x or y is less then 1, calculation is not correct.
- make calculate correct position of y when even though scroll direction is horiziontal
(when virtical, x is also calculation correct position).
3. change smart data variable s_type to scroll_to_type to make unity on gen widget.
(genlist smart data variable name is scroll_to_type);
Reviewers: seoz, Hermet, raster
Reviewed By: raster
CC: bluezery
Differential Revision: https://phab.enlightenment.org/D474
cee12e4f94