R: modify a variable conditioned on data from multiple previous rows

Hi I would really appreciate some help for this, I really couldn't find the solution in previous questions.

I have a tibble in long format (rows grouped by id and arranged by time). I want to create a variable "eleg" based on "varx". The condition would be that "eleg" = 1 if "varx" in the previous 3 rows == 0 and in the current row varx == 1, if not = 0. If possible using dplyr.

id <- c(1,1,1,1,1,1,1,2,2,2,2,2,2,3,3,3,3)
time <- c(1,2,3,4,5,6,7,1,2,3,4,5,6,1,2,3,4)
varx <- c(0,0,0,0,1,1,0,0,1,1,1,1,1,0,0,0,1)
eleg <- c(0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,1)
table <- data.frame(id, time, varx, eleg)

In my real dataset the condition is "in the previous 24 rows" and the same ID could have eleg == 1 more than one time if it suits the condition.

Thank you.