Object order within group

How-to
1

Description

Is there a functionality where after removing an object from a group, when re-adding the object it is added within relation to another object?

Example:
(Assuming default group)

Current Behavior:

  • Original Group order:
    Obj_A → Obj_B → Obj_C → Obj_D
  • Remove Obj_B from group:
    lv_group_remove_obj(Obj_B);
  • Re-add Obj_B to group:
    lv_group_add_obj(lv_group_get_default, Obj_B);
  • New group order
    Obj_A ->Obj_C → Obj_D → Obj_B

Desired/Future Behavior:

  • Original Group order:
    Obj_A → Obj_B → Obj_C → Obj_D
  • Remove Obj_B from group:
    lv_group_remove_obj(Obj_B);
  • Re-add Obj_B to group:
    lv_group_add_obj(lv_group_get_default, Obj_B, Obj_A);
  • New group order
    Obj_A → Obj_B → Obj_C → Obj_D

What LVGL version are you using?

v8.3.10

Do you think this is something that can be added? Currently, the only way I have been able to archive the proper order again is to re-add all obj within the group

2

Use lv_obj_set_parent to change parent object:
https://docs.lvgl.io/master/API/core/lv_obj_tree.html#_CPPv417lv_obj_set_parentP9_lv_obj_tP9_lv_obj_t

Use lv_obj_move_to_index to adjust the order of child objects:
https://docs.lvgl.io/master/API/core/lv_obj_tree.html#_CPPv420lv_obj_move_to_indexP9_lv_obj_t7int32_t

3

@FASTSHIFT your reply is complete out of Q

I mean group for indev can be only recreated
lv_group_remove_all_objs (lv_group_t*group )
and add all in new order.

4

As @mmar22 mentioned this only takes care of the “screen” order, but not within the group.

The remove all → re-add all approach does work, but a lv_group_move_to_index like function would be ideal! I’ll see if that is something I can work on.

5

Both move to index or readd is unnefective. Effective is only dont remove objects from groups and mark it not focusable or somethink that skip indev…

6

Removing from the group is what skips it as we discussed here: Encoder: How to make object not "focused" - #7 by kisvegabor