lv_obj_add_event_cb() function

Add an event handler function for an object. Used by the user to react on event which happens with the object. An object can have multiple event handler. They will be called in the same order as they were added.

Syntax

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Summary

Declaration

Definition

from lv_event.h:237

struct _lv_event_dsc_t * lv_obj_add_event_cb(struct _lv_obj_t * obj, lv_event_cb_t event_cb, lv_event_code_t filter, void * user_data);

Implemented in lv_event.c:162

Arguments

Argument

Description

obj

pointer to an object

event_cb

the new event function

filter

and event code (e.g. `LV_EVENT_CLICKED`) on which the event should be called. `LV_EVENT_ALL` can be sued the receive all the events.

user_data

custom data data will be available in `event_cb`

Return value

a pointer the event descriptor. Can be used in ::lv_obj_remove_event_dsc

Examples

References

from examples

lv_obj_add_event_cb() function

Syntax

Arguments

Return value

Examples

References

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