lv_observer_private.h

API reference for lv_observer_private.h

See Also: Public APIThis is the private implementation. See the public header for the stable interface.lv_observer.h

Structs

struct

_lv_observer_t

The observer object: a descriptor returned when subscribing LVGL widgets to subjects

Member	Type	Description
subject	lv_subject_t *	Observed subject
cb	lv_observer_cb_t	Callback that notifies when value changes
target	void *	A target for the observer, e.g. a widget or any pointer
user_data	void *	Additional parameter supplied when subscribing
auto_free_user_data	uint32_t	Automatically free user data when observer is removed
notified	uint32_t	Was observer already notified?
for_obj	uint32_t	Is target a pointer to a Widget (lv_obj_t *)?

struct

_lv_subject_increment_dsc_t

Descriptor created by lv_obj_add_subject_increment_event()

Member	Type	Description
subject	lv_subject_t *	The subject to adjust
step	int32_t	The step add to the subject
rollover	bool	Where to start over from the other end when one end is exceeded
min_value	int32_t	Don't set a value smaller than this
max_value	int32_t	Don't set a value larger than this

Dependencies