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feat(obj): add lv_obj_remove_event_cb

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based on #2128
This commit is contained in:
Gabor Kiss-Vamosi 2021-03-17 10:15:49 +01:00
parent 4a0dbffc47
commit b0c1febc16
2 changed files with 43 additions and 2 deletions
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30
src/core/lv_obj.c
View File

@ -391,7 +391,37 @@ void lv_obj_add_event_cb(lv_obj_t * obj, lv_event_cb_t event_cb, void * user_dat
obj->spec_attr->event_dsc[obj->spec_attr->event_dsc_cnt - 1].cb = event_cb;
obj->spec_attr->event_dsc[obj->spec_attr->event_dsc_cnt - 1].user_data = user_data;
}
bool lv_obj_remove_event_cb(lv_obj_t * obj, lv_event_cb_t event_cb, void * user_data)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
if(obj->spec_attr == NULL) return false;
int32_t i = 0;
for(i = 0; i < obj->spec_attr->event_dsc_cnt; i++) {
if(obj->spec_attr->event_dsc[i].cb == event_cb) {
/*Check if user_data matches or if the requested user_data is NULL*/
if(user_data == NULL || obj->spec_attr->event_dsc[i].user_data == user_data) {
/*Found*/
break;
}
}
}
if(i >= obj->spec_attr->event_dsc_cnt) {
/*No event handler found*/
return false;
}
/*Shift the remaining event handlers forward*/
for(; i < (obj->spec_attr->event_dsc_cnt-1); i++) {
obj->spec_attr->event_dsc[i].cb = obj->spec_attr->event_dsc[i+1].cb;
obj->spec_attr->event_dsc[i].user_data = obj->spec_attr->event_dsc[i+1].user_data;
}
obj->spec_attr->event_dsc_cnt--;
obj->spec_attr->event_dsc = lv_mem_realloc(obj->spec_attr->event_dsc, obj->spec_attr->event_dsc_cnt * sizeof(lv_event_dsc_t));
LV_ASSERT_MALLOC(obj->spec_attr->event_dsc);
return true;
}
void lv_obj_set_base_dir(lv_obj_t * obj, lv_bidi_dir_t dir)

15
src/core/lv_obj.h
View File

@ -405,15 +405,26 @@ void lv_obj_add_state(lv_obj_t * obj, lv_state_t state);
void lv_obj_clear_state(lv_obj_t * obj, lv_state_t state);
/**
* Add a an event handler function for an object.
* 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 the order as they were added.
* An object can have multiple event handler. They will be called in the same order as they were added.
* @param obj pointer to an object
* @param event_cb the new event function
* @param user_data custom data data will be available in `event_cb`
*/
void lv_obj_add_event_cb(lv_obj_t * obj, lv_event_cb_t event_cb, void * user_data);
/**
* Remove 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.
* @param obj pointer to an object
* @param event_cb the event function to remove
* @param user_data if NULL, remove the first event handler with the same cb, otherwise remove the first event handler with the same cb and user_data
* @return true if any event handlers were removed
*/
bool lv_obj_remove_event_cb(lv_obj_t * obj, lv_event_cb_t event_cb, void * user_data);
/**
* Set the base direction of the object
* @param obj pointer to an object