Implemented a back button. Pressing the button in scroll_mt mode will issue a KEY_BACK command, allowing to easily browse between pages.

src/controller/controls/scroll_mt.rs

@@ -2,6 +2,7 @@ use crate::controller::{ControlMode, ControlModeMeta};
 use crate::dial_device::DialHaptics;
 use crate::error::{Error, Result};
 use crate::fake_input;
+use evdev_rs::enums::EV_KEY;
 use std::sync::{Arc, Mutex};
 use std::thread::{self, JoinHandle};
 use std::time::{Duration, Instant};
@@ -92,16 +93,12 @@ impl ControlMode for ScrollMT {
     }
 
     fn on_btn_press(&mut self, _: &DialHaptics) -> Result<()> {
-        // End multitouch scrolling on button press
-        fake_input::scroll_mt_end().map_err(Error::Evdev)?;
-        *self.is_scrolling.lock().unwrap() = false;
         Ok(())
     }
 
     fn on_btn_release(&mut self, _haptics: &DialHaptics) -> Result<()> {
-        // Restart multitouch scrolling on button release
-        fake_input::scroll_mt_start().map_err(Error::Evdev)?;
-        *self.is_scrolling.lock().unwrap() = true;
+        // Send "previous page" signal on button press
+        fake_input::key_click(&[EV_KEY::KEY_BACK]).map_err(Error::Evdev)?;
         Ok(())
     }
 

src/fake_input.rs

@@ -44,6 +44,9 @@ lazy_static::lazy_static! {
                 device.enable(&EventCode::EV_KEY(EV_KEY::KEY_SPACE))?;
                 device.enable(&EventCode::EV_KEY(EV_KEY::KEY_EQUAL))?;
                 device.enable(&EventCode::EV_KEY(EV_KEY::KEY_MINUS))?;
+
+                // ADDED: Enable KEY_BACK
+                device.enable(&EventCode::EV_KEY(EV_KEY::KEY_BACK))?;
             }
 
             device.enable(&EventType::EV_REL)?;