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Update layer.md

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Gabor Kiss-Vamosi
2023-01-13 09:28:23 +01:00
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docs/overview/layer.md
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@@ -34,15 +34,14 @@ lv_label_set_text(label2, "Button 2"); /*Set the text of the label*/
lv_obj_del(label2); lv_obj_del(label2);
``` ```
## Bring to the foreground ## Change order
There are four explicit ways to bring an object to the foreground: There are four explicit ways to bring an object to the foreground:
- Use `lv_obj_move_foreground(obj)` to bring an object to the foreground. Similarly, use `lv_obj_move_background(obj)` to move it to the background. - Use `lv_obj_move_foreground(obj)` to bring an object to the foreground. Similarly, use `lv_obj_move_background(obj)` to move it to the background.
- Use `lv_obj_move_up(obj)` to move an object one position up in the hierarchy, Similarly, use `lv_obj_move_down(obj)` to move an object one position down in the hierarchy. - Use `lv_obj_move_to_index(obj, idx)` to move an object to a given index in the order of children. (0: background, child_num - 1: foreground, <0: count from the top, to move forward (up): `lv_obj_move_to_index(obj, lv_obj_get_index(obj) - 1)`)
- Use `lv_obj_swap(obj1, obj2)` to swap the relative layer position of two objects. - Use `lv_obj_swap(obj1, obj2)` to swap the relative layer position of two objects.
- When `lv_obj_set_parent(obj, new_parent)` is used, `obj` will be on the foreground of the `new_parent`. - When `lv_obj_set_parent(obj, new_parent)` is used, `obj` will be on the foreground of the `new_parent`.
## Top and sys layers ## Top and sys layers
LVGL uses two special layers named `layer_top` and `layer_sys`. LVGL uses two special layers named `layer_top` and `layer_sys`.