Implement input configuration for trackballs (#743)

* niri-config: add trackball configuration struct

The available options are mostly the same as for mice. I've verified that each
option is applicable to trackballs in the libinput CLI.

* input: apply trackball config settings

1 files changed, 19 insertions, 0 deletions

diff --git a/src/input/mod.rs b/src/input/mod.rs
index f4beb9f0..ee201922 100644
--- a/src/input/mod.rs
+++ b/src/input/mod.rs
@@ -2718,6 +2718,25 @@ pub fn apply_libinput_settings(config: &niri_config::Input, device: &mut input::
         }
     }
 
+    if is_trackball {
+        let c = &config.trackball;
+        let _ = device.config_send_events_set_mode(if c.off {
+            input::SendEventsMode::DISABLED
+        } else {
+            input::SendEventsMode::ENABLED
+        });
+        let _ = device.config_scroll_set_natural_scroll_enabled(c.natural_scroll);
+        let _ = device.config_accel_set_speed(c.accel_speed);
+        let _ = device.config_middle_emulation_set_enabled(c.middle_emulation);
+        let _ = device.config_left_handed_set(c.left_handed);
+
+        if let Some(accel_profile) = c.accel_profile {
+            let _ = device.config_accel_set_profile(accel_profile.into());
+        } else if let Some(default) = device.config_accel_default_profile() {
+            let _ = device.config_accel_set_profile(default);
+        }
+    }
+
     if is_trackpoint {
         let c = &config.trackpoint;
         let _ = device.config_send_events_set_mode(if c.off {