Detect if all the folder contents have been viewed on Content pane. How?

I have allways a folder with several sub-folders with some images there.

MotherFolder with:

     > Folder01 > 5 images

     > Folder02 > 3 images

     > Folder03 > 7 images

(...)

On BridgeCS6, on 'MotherFolder' content, I want to to run an action renaming Folder01, Folder02, Folder03

only with 1 condition: if the cache of all the images thumbnails has been built (in other words, only if someone has already viewed on Content all the images in each folder).

Briefly, when Bridge has never previewed com Content pane the images of some Folder, it detect it and don't runs the script of renaming the folders.

Is this possible?

I have manage to write the rename script, but I must script the condition.