Information about the previous photo in the directory/folder (if 1 file is selected)

[ADrobkov]

Hello! Thanks to your help, I figured out a lot and set up LR for myself. But still a lot of things I want to implement.

Question. I picked one photo from the library and I can see its metadata and information on the side. Can I get information about the metadata of the previous photo at this point?

local LrApplication = import("LrApplication")
local LrTasks = import("LrTasks")
local catalog = import("LrApplication").activeCatalog()
local LrBinding = import("LrBinding")
local LrFunctionContext = import("LrFunctionContext")
local LrProgressScope = import("LrProgressScope")
local LrPrefs = import("LrPrefs")
local prefs = LrPrefs.prefsForPlugin()
function showDialog(context)
  local props = LrBinding.makePropertyTable(context)
    local fillFormat = props.fillFormat
    prefs.fillFormat = fillFormat
    updateFill(fillFormat)
end
function updateFill(fillFormat)
  LrTasks.startAsyncTask(function()
    catalog:withWriteAccessDo("&Фиксация данных: \"STP\"", function()
      local photos = catalog.targetPhotos
      local countPhotos = #photos
      local ProgressBar = LrProgressScope({
        title = "Фиксация данных \"STP\" для " .. tostring(countPhotos) .. " файла(ов)"
      })
      for i, photo in ipairs(photos) do
local settings = photo:getDevelopSettings()
local typeColor = ''
local ConvertToGrayscale = (settings["ConvertToGrayscale"])
if ConvertToGrayscale == true then typeColor = 'M' else typeColor = 'C' end
photo:setRawMetadata("copyName", 'S'..typeColor)
        local previousversionFile = GETTING DATA WITH FIELD provider of the PREVIOUS FILE
versionFile = 1 + previousversionFile 
photo:setRawMetadata("provider", versionFile)
photo:setRawMetadata("label", 'STP')
photo:setRawMetadata("location", 'Drive')
        local fileFormat = photo:getRawMetadata("fileFormat") or ""
if fileFormat == 'TIFF' then
photo:buildSmartPreview()
end
        ProgressBar:setPortionComplete(i, countPhotos)
      end
      ProgressBar:done()
    end)
  end)
end
LrFunctionContext.callWithContext("theName", showDialog)

Without this line "local previousversionFile = GETTING DATA WITH FIELD provider of the PREVIOUS FILE" everything works.

Here is an example of the code I want to use for file version numbering. To do this, I use the "provider"field. By default, for each photo in this field is set to 0. If I want to create a new version of processing with my hands, I create a virtual copy and run this code. I want to add it so that it took data from the provider field and added 1 and assigned this value to the current file. This can be done by selecting 2 files. But is it possible to do with one active selection (LR does not quickly process the selection and uploading of data if the selected photo is more than one).

Thanks in advance for your help

[johnrellis]

This can be done by selecting 2 files. But is it possible to do with one active selection

To test my understanding: The user has selected exactly one photo in Library grid view. You want your plugin to find the photo that appears in grid view or the filmstrip immediately before that photo.

Assuming my understanding is correct, the plugin can get an array of all photos visible in the grid or filmstrip using this song-and-dance:

--[[----------------------------------------------------------------------------
array of LrPhoto
visiblePhotos ()
Returns an array of all currently visible photos in the grid or filmstrip. The
implementation seems fragile, working around a limitation in the SDK.  But it
seems to work.
------------------------------------------------------------------------------]]
function visiblePhotos ()
    local selectedPhotos = catalog:getTargetPhotos ()
    local selectedPhoto = catalog:getTargetPhoto ()
    if selectedPhoto == nil then return selectedPhotos end
    catalog:setSelectedPhotos (selectedPhoto, {})
    local allVisiblePhotos = catalog:getMultipleSelectedOrAllPhotos ()
    catalog:setSelectedPhotos (selectedPhoto, selectedPhotos)
    return allVisiblePhotos
    end   

The plugin can search that array for the currently selected photo and then choose the photo immediately before it in the array.