I've got a wacom pen with a button. How can I trigger scrolling when moving the pen with the button pressed?According to xev, below, the triggering events are MotionNotify with state 0x200.If this isn't done trivially, an idea I have is to build a service to read these events from somewhere and transform them into other events. This way, I can define gestures, as well. With this approach:Where can I read them?How can I write events back?Are there libraries to detect gestures?MotionNotify event, serial 33, synthetic NO, window 0xc00001,    root 0x2ce, subw 0x0, time 695630659, (349,181), root:(1255,185),    state 0x0, is_hint 0, same_screen YESButtonPress event, serial 33, synthetic NO, window 0xc00001,    root 0x2ce, subw 0x0, time 695630659, (349,181), root:(1255,185),    state 0x0, button 2, same_screen YESMotionNotify event, serial 33, synthetic NO, window 0xc00001,    root 0x2ce, subw 0x0, time 695630667, (348,183), root:(1254,187),    state 0x200, is_hint 0, same_screen YESMotionNotify event, serial 33, synthetic NO, window 0xc00001,    root 0x2ce, subw 0x0, time 695630675, (347,184), root:(1253,188),    state 0x200, is_hint 0, same_screen YES...MotionNotify event, serial 33, synthetic NO, window 0xc00001,    root 0x2ce, subw 0x0, time 695632069, (327,486), root:(1233,490),    state 0x200, is_hint 0, same_screen YESButtonRelease event, serial 33, synthetic NO, window 0xc00001,    root 0x2ce, subw 0x0, time 695632069, (327,486), root:(1233,490),    state 0x200, button 2, same_screen YES
Scrolling with a WACOM tablet pen
linux;xorg;hardware