R help - Dec 2020 - plotly: ability to drag points on x axis only and prevent change of y axis value

Hello,

wonder if you could provide input on the following: please see toy example
below, wanted to see if there is a way to have restrictions on how the points
are dragged on the plot. More specifically I would like the points draggable
horizontally ONLY and have their y axis value remain fixed, ie the movement
vertically would be restricted and no change allowed to that direction for each
point? much appreciate any input you may have,

library(plotly)
library(purrr)

# creates a list of 32 circle shapes (one for each row/car)
circles <- map2(
? mtcars$mpg,?
? mtcars$wt,?
? ~list(
? ? type = "circle",
? ? # anchor circles at (mpg, wt)
? ? xanchor = .x,
? ? yanchor = .y,
? ? # give each circle a 2 pixel diameter
? ? x0 = -5, x1 = 5,
? ? y0 = -5, y1 = 5,
? ? xsizemode = "pixel",?
? ? ysizemode = "pixel",
? ? # other visual properties
? ? fillcolor = "blue",
? ? line = list(color = "transparent")
? )
)


plot_ly() %>%
? layout(shapes = circles) %>%
? config(edits = list(shapePosition = TRUE))


appreciate the help,


thanks,

Andras?