Base Widget

The lv_obj_t base class that every other widget inherits from, usable directly as a container or styling surface.

Base objects with and without shadow

Two base objects showing default styling next to a custom blue shadow.

Two lv_obj base objects are placed on the active screen. The first, sized 100 by 50, uses the default theme. The second keeps the default size and picks up a shared lv_style_t with a blue 10 px shadow spread by 5 px. Both are offset from center so the shadow difference is visible side by side.

Draggable base object

Move a Drag me object under the pointer using LV_EVENT_PRESSING.

A 150 by 100 base object carries a centered Drag me label. An LV_EVENT_PRESSING callback reads the active input device's motion vector with lv_indev_get_vect, adds it to the object's current aligned position, and calls lv_obj_set_pos so the object follows the pointer as long as it is held down.

Animated matrix transform on a base object

Continuously scale and rotate a centered object using lv_obj_set_transform.

A centered base object is paired with a 20 ms lv_timer that builds an identity lv_matrix_t, scales its x axis, rotates it by 360 times the scale factor, and applies the result with lv_obj_set_transform. The scale factor grows from 0.1 to 2.0 in 0.01 steps; once it exceeds 2.0 the object is reset with lv_obj_reset_transform and the loop restarts.