id property
The id that is used to report a button press or release to the terminal.
Mouse wheel buttons use ids 64-67 (bit 6 set), as standardized by xterm: wheel up = 64, wheel down = 65, wheel left = 66, wheel right = 67. Modifier bits (shift = 4, alt = 8, ctrl = 16) are OR'ed onto the id when reporting.
Implementation
final int id;