SDK Paste Previous?

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I was looking through the SDK documentation and cannot find a way to Paste Previous via the SDK. Am I missing something?

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johnrellis

Legend

Unfortunately, the SDK doesn't provide direct support for Paste Settings From Previous. You could implement it with a modest amount of effort by having a background task that polls once a second (say) for the currently selected photo (with catalog:getTargetPhoto ()) and remembers it as the user moves to another photo. Then your plugin can use photo:getDevelopSettings() and photo:applyDevelopSettings() to implement Paste Settings From Previous.

My Any Source plugin uses such polling to implement a better "previous" command, and it has negligible CPU cost and never interferes with interactive use.

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C

cwurzbachAuthor

Known Participant

@johnrellis thanks for the information! I'm surprised that this isn't built into the SDK.

With your solution, if a user waits more than the time allotted for the polling to paste, then the settings pasted will be from the current photo. How do you get around this?

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johnrellis

Legend

I was proposing a continuously running background task like this:

local previousPhoto, currentPhoto

LrTasks.startAsyncTask (function ()
    while true do 
        local photo = catalog:getTargetPhoto ()
        if photo ~= currentPhoto then 
            previousPhoto, currentPhoto = currentPhoto, photo
            end 
        LrTasks.sleep (1)
        end
    end)

Then the paste-from-previous command would copy the settings from "previousPhoto" (if it is non-nil).

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