How to overlay icons for a dir/file using Qt ?

[rawfool]

How can I achieve svn like folder/file overlays ?
I want to change the icons of the overlays as the corresponding directory/file(s) are modified. I'm watching the directory using inotify, so any change in the file(s)/sub-directorie(s) of the watch directory shall give me a signal and based on the signal I need to update the relevant icon to the views in the directory.

Thank you.

Update:
Something like in the pic shown below -
overlay icons.jpg