Allow 'auto' as an option for height (or width) in `img_header`

[SCasanova]

For shiny applications it would be useful to be able to set auto for either of those properties so different images fit the table header.

[jthomasmock]

Howdy @SCasanova, thanks for the report!

Can you provide a reprex of the behavior? Is it an issue with resizing the table or the images themselves are scaled differently?

As far as I understand, table-based auto-resizing would likely require javascript which I likely do not have the skillset to enable.

For more generic sizing of images, I can try playing around with percentages eg height='15%', but that may lead to some undesirable behavior.

[SCasanova]

Yes, it's more a feature request than it is an issue per se.

I think the option for the image to be auto-sized to the table would be useful in many applications but I understand if it's not something realistic at the moment

[jthomasmock]

Howdy @SCasanova - I might be missing the issue here.

When using differently sized width/height images they are normalized to a shared height with varying widths (since the images are wider or narrower).

library(gt)

base_tab <- dplyr::tibble(
  a = 1, b = 2, c = 3
) %>% 
  gt()

test_img <-  base_tab %>%
  cols_label(
    a = gtExtras::img_header("3 brownies", "https://i.imgur.com/tI5jq2c.jpg"),
    b = gtExtras::img_header("5 waffles", "https://i.imgur.com/37w80TG.jpg"),
    c = gtExtras::img_header("1 cake bite", "https://i.imgur.com/B1MCOtx.jpg")
  ) %>%
  gtExtras::gtsave_extra("test.png", selector = "table")

magick::image_read("test.png")

tab1 <- base_tab %>%
  tab_header(title = gtExtras::img_header("3 brownies", "https://i.imgur.com/tI5jq2c.jpg")) |> 
  gtExtras::gtsave_extra("head1.png", selector = "table")

tab2 <- base_tab %>%
  tab_header(title = gtExtras::img_header("5 waffles", "https://i.imgur.com/37w80TG.jpg")) %>%
  gtExtras::gtsave_extra("head2.png", selector = "table")

img1 <- magick::image_read("head1.png")
img2 <- magick::image_read("head2.png")

magick::image_append(c(img1, img2))

^{Created on 2022-05-26 by the reprex package (v2.0.1)}

[jthomasmock]

Closing for now as I believe it's working for different sized images.