How to stop scrolling beyond endpoints in roller

How-to
1

image
i want to stop scrolling beyond endpoint for example scrolling down removed january from selection area it should lock

2

Hi @isfandcielo,

To prevent scrolling beyond the content endpoints you have two main approaches:

  • lv_obj_scroll_by_bounded()
lv_obj_scroll_by_bounded(my_obj, 0, -20, LV_ANIM_ON);
  • Use Snap Points to Lock Items in Place

lv_obj_set_scroll_snap_y(container, LV_SCROLL_SNAP_CENTER);

lv_obj_add_flag(container, LV_OBJ_FLAG_SCROLL_ONE);

lv_obj_add_flag(child_item, LV_OBJ_FLAG_SNAPPABLE);
3

i have tried these three option they don’t work my roller still get dragged when scrolled beyond end point but it does come back and to last value
I was looking for to not even scroll beyond end points

Blockquote
LV_DRAW_BUF_DEFINE_STATIC(mask, 130, 150, LV_COLOR_FORMAT_L8);
LV_DRAW_BUF_INIT_STATIC(mask);
lv_obj_t *roller
= lv_obj_find_by_name(lv_screen_active(), “temp_setpnt_roller”);
if(roller == NULL)
return;

// lv_obj_scroll_by_bounded(roller, 0, 0, LV_ANIM_OFF);

lv_obj_set_scroll_snap_y(roller, LV_SCROLL_SNAP_CENTER);

lv_obj_add_flag(roller, LV_OBJ_FLAG_SCROLL_ONE);

lv_obj_add_flag(roller, LV_OBJ_FLAG_SNAPPABLE);

also lvgl ui pro editor doesnot have these option so had to branch the code to make this happen

4

@halyssonJr