PreviewHandlers cannot be extended

Question / Problem

I would like to add some functionality to an existing preview, like the ability to zoom into a pdf file, select text in a text preview, react on mouse or keyboard events, etc.

Is this possible?

Answer / Solution

As ShellBrowser makes use of the preview handlers in the system via a  limited official interface, the previews are unfortunately "as is".

If you are requesting additional features, you mostly have to find a different preview. Especially for pdf several programs providing preview handlers are available.