SourceVuESP-IDF Framework and Examplesi80_controller samplelv_observer_t

lv_observer_t struct

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

Syntax

Show:

Summary

Declaration

Definition

from lv_types.h:252

typedef struct lv_observer_t lv_observer_t;

Implemented in lv_observer_private.h:32

Fields

Field

Declared as

Description

lv_observer_t::subject

lv_subject_t *

The observed value.

lv_observer_t::cb

lv_observer_cb_t

Callback that should be called when the value changes.

lv_observer_t::target

void *

A target for the observer, e.g. a widget or style.

lv_observer_t::user_data

void *

Additional parameter supplied when subscribing.

lv_observer_t::auto_free_user_data

uint32_t : 1

Automatically free user data when the observer is removed.

lv_observer_t::notified

uint32_t : 1

Mark if this observer was already notified.

lv_observer_t::for_obj

uint32_t : 1

`target` is an `lv_obj_t *`.

References

from examples

lv_observer_t struct

Syntax

Fields

Examples

References

Call Tree

Data Use

Class Tree

Override Tree

Implementations

Instances

Lifecycle