The input-pad-devel package contains the header files.
acquired package info from repodata DB: repodata/1878cc60a19e65efc93d1a539275c5a6799b0acbd7796ee105712c44cae47ab4-primary.sqlite.bz2
On-screen Input Pad to Send Characters with Mouse
The input pad is a tool to send a character on button to text applications.