backend: make input device properties readable

src/backend.rs

@@ -118,14 +118,38 @@ pub trait InputDevice {
     fn on_change(&self, cb: Rc<dyn Fn()>);
     fn grab(&self, grab: bool);
     fn has_capability(&self, cap: InputDeviceCapability) -> bool;
+    fn left_handed(&self) -> Option<bool> {
+        None
+    }
     fn set_left_handed(&self, left_handed: bool);
+    fn accel_profile(&self) -> Option<InputDeviceAccelProfile> {
+        None
+    }
     fn set_accel_profile(&self, profile: InputDeviceAccelProfile);
+    fn accel_speed(&self) -> Option<f64> {
+        None
+    }
     fn set_accel_speed(&self, speed: f64);
+    fn transform_matrix(&self) -> Option<TransformMatrix> {
+        None
+    }
     fn set_transform_matrix(&self, matrix: TransformMatrix);
     fn name(&self) -> Rc<String>;
+    fn tap_enabled(&self) -> Option<bool> {
+        None
+    }
     fn set_tap_enabled(&self, enabled: bool);
+    fn drag_enabled(&self) -> Option<bool> {
+        None
+    }
     fn set_drag_enabled(&self, enabled: bool);
+    fn drag_lock_enabled(&self) -> Option<bool> {
+        None
+    }
     fn set_drag_lock_enabled(&self, enabled: bool);
+    fn natural_scrolling_enabled(&self) -> Option<bool> {
+        None
+    }
     fn set_natural_scrolling_enabled(&self, enabled: bool);
 }
 

src/backends/metal.rs

@@ -290,17 +290,22 @@ struct MetalInputDevice {
     events: SyncQueue<InputEvent>,
     cb: CloneCell<Option<Rc<dyn Fn()>>>,
     name: CloneCell<Rc<String>>,
-    natural_scrolling: Cell<bool>,
+    transform_matrix: Cell<Option<TransformMatrix>>,
 
     // state
     pressed_keys: SmallMap<u32, (), 5>,
     pressed_buttons: SmallMap<u32, (), 2>,
 
     // config
+    desired: InputDeviceProperties,
+    effective: InputDeviceProperties,
+}
+
+#[derive(Default)]
+struct InputDeviceProperties {
     left_handed: Cell<Option<bool>>,
     accel_profile: Cell<Option<AccelProfile>>,
     accel_speed: Cell<Option<f64>>,
-    transform_matrix: Cell<Option<TransformMatrix>>,
     tap_enabled: Cell<Option<bool>>,
     drag_enabled: Cell<Option<bool>>,
     drag_lock_enabled: Cell<Option<bool>>,
@@ -341,30 +346,58 @@ impl LibInputAdapter for DeviceHolder {
 
 impl MetalInputDevice {
     fn apply_config(&self) {
-        let dev = match self.inputdev.get() {
-            Some(dev) => dev,
-            _ => return,
+        if self.inputdev.is_none() {
+            return;
+        }
+        if let Some(lh) = self.desired.left_handed.get() {
+            self.set_left_handed(lh);
+        }
+        if let Some(profile) = self.desired.accel_profile.get() {
+            self.set_accel_profile_(profile);
+        }
+        if let Some(speed) = self.desired.accel_speed.get() {
+            self.set_accel_speed(speed);
+        }
+        if let Some(enabled) = self.desired.tap_enabled.get() {
+            self.set_tap_enabled(enabled);
+        }
+        if let Some(enabled) = self.desired.drag_enabled.get() {
+            self.set_drag_enabled(enabled);
+        }
+        if let Some(enabled) = self.desired.drag_lock_enabled.get() {
+            self.set_drag_lock_enabled(enabled);
+        }
+        if let Some(enabled) = self.desired.natural_scrolling_enabled.get() {
+            self.set_natural_scrolling_enabled(enabled);
+        }
+        self.fetch_effective();
+    }
+
+    fn fetch_effective(&self) {
+        let Some(dev) = self.inputdev.get() else {
+            return;
         };
-        if let Some(lh) = self.left_handed.get() {
-            dev.device().set_left_handed(lh);
+        let device = dev.device();
+        if device.left_handed_available() {
+            self.effective.left_handed.set(Some(device.left_handed()));
         }
-        if let Some(profile) = self.accel_profile.get() {
-            dev.device().set_accel_profile(profile);
+        if device.accel_available() {
+            self.effective
+                .accel_profile
+                .set(Some(device.accel_profile()));
+            self.effective.accel_speed.set(Some(device.accel_speed()));
         }
-        if let Some(speed) = self.accel_speed.get() {
-            dev.device().set_accel_speed(speed);
+        if device.tap_available() {
+            self.effective.tap_enabled.set(Some(device.tap_enabled()));
+            self.effective.drag_enabled.set(Some(device.drag_enabled()));
+            self.effective
+                .drag_lock_enabled
+                .set(Some(device.drag_lock_enabled()));
         }
-        if let Some(enabled) = self.tap_enabled.get() {
-            dev.device().set_tap_enabled(enabled);
-        }
-        if let Some(enabled) = self.drag_enabled.get() {
-            dev.device().set_drag_enabled(enabled);
-        }
-        if let Some(enabled) = self.drag_lock_enabled.get() {
-            dev.device().set_drag_lock_enabled(enabled);
-        }
-        if let Some(enabled) = self.natural_scrolling_enabled.get() {
-            self.do_set_natural_scrolling_enabled(&dev, enabled);
+        if device.has_natural_scrolling() {
+            self.effective
+                .natural_scrolling_enabled
+                .set(Some(device.natural_scrolling_enabled()));
         }
     }
 
@@ -386,10 +419,16 @@ impl MetalInputDevice {
         }
     }
 
-    fn do_set_natural_scrolling_enabled(&self, dev: &RegisteredDevice, enabled: bool) {
-        dev.device().set_natural_scrolling_enabled(enabled);
-        self.natural_scrolling
-            .set(dev.device().natural_scrolling_enabled());
+    fn set_accel_profile_(&self, profile: AccelProfile) {
+        self.desired.accel_profile.set(Some(profile));
+        if let Some(dev) = self.inputdev.get() {
+            if dev.device().accel_available() {
+                dev.device().set_accel_profile(profile);
+                self.effective
+                    .accel_profile
+                    .set(Some(dev.device().accel_profile()));
+            }
+        }
     }
 }
 
@@ -431,9 +470,14 @@ impl InputDevice for MetalInputDevice {
     }
 
     fn set_left_handed(&self, left_handed: bool) {
-        self.left_handed.set(Some(left_handed));
+        self.desired.left_handed.set(Some(left_handed));
         if let Some(dev) = self.inputdev.get() {
-            dev.device().set_left_handed(left_handed);
+            if dev.device().left_handed_available() {
+                dev.device().set_left_handed(left_handed);
+                self.effective
+                    .left_handed
+                    .set(Some(dev.device().left_handed()));
+            }
         }
     }
 
@@ -442,16 +486,18 @@ impl InputDevice for MetalInputDevice {
             InputDeviceAccelProfile::Flat => LIBINPUT_CONFIG_ACCEL_PROFILE_FLAT,
             InputDeviceAccelProfile::Adaptive => LIBINPUT_CONFIG_ACCEL_PROFILE_ADAPTIVE,
         };
-        self.accel_profile.set(Some(profile));
-        if let Some(dev) = self.inputdev.get() {
-            dev.device().set_accel_profile(profile);
-        }
+        self.set_accel_profile_(profile);
     }
 
     fn set_accel_speed(&self, speed: f64) {
-        self.accel_speed.set(Some(speed));
+        self.desired.accel_speed.set(Some(speed));
         if let Some(dev) = self.inputdev.get() {
-            dev.device().set_accel_speed(speed);
+            if dev.device().accel_available() {
+                dev.device().set_accel_speed(speed);
+                self.effective
+                    .accel_speed
+                    .set(Some(dev.device().accel_speed()));
+            }
         }
     }
 
@@ -464,32 +510,90 @@ impl InputDevice for MetalInputDevice {
     }
 
     fn set_tap_enabled(&self, enabled: bool) {
-        self.tap_enabled.set(Some(enabled));
+        self.desired.tap_enabled.set(Some(enabled));
         if let Some(dev) = self.inputdev.get() {
-            dev.device().set_tap_enabled(enabled);
+            if dev.device().tap_available() {
+                dev.device().set_tap_enabled(enabled);
+                self.effective
+                    .tap_enabled
+                    .set(Some(dev.device().tap_enabled()));
+            }
         }
     }
 
     fn set_drag_enabled(&self, enabled: bool) {
-        self.drag_enabled.set(Some(enabled));
+        self.desired.drag_enabled.set(Some(enabled));
         if let Some(dev) = self.inputdev.get() {
-            dev.device().set_drag_enabled(enabled);
+            if dev.device().tap_available() {
+                dev.device().set_drag_enabled(enabled);
+                self.effective
+                    .drag_enabled
+                    .set(Some(dev.device().drag_enabled()));
+            }
         }
     }
 
     fn set_drag_lock_enabled(&self, enabled: bool) {
-        self.drag_lock_enabled.set(Some(enabled));
+        self.desired.drag_lock_enabled.set(Some(enabled));
         if let Some(dev) = self.inputdev.get() {
-            dev.device().set_drag_lock_enabled(enabled);
+            if dev.device().tap_available() {
+                dev.device().set_drag_lock_enabled(enabled);
+                self.effective
+                    .drag_lock_enabled
+                    .set(Some(dev.device().drag_lock_enabled()));
+            }
         }
     }
 
     fn set_natural_scrolling_enabled(&self, enabled: bool) {
-        self.natural_scrolling_enabled.set(Some(enabled));
+        self.desired.natural_scrolling_enabled.set(Some(enabled));
         if let Some(dev) = self.inputdev.get() {
-            self.do_set_natural_scrolling_enabled(&dev, enabled);
+            if dev.device().has_natural_scrolling() {
+                dev.device().set_natural_scrolling_enabled(enabled);
+                self.effective
+                    .natural_scrolling_enabled
+                    .set(Some(dev.device().natural_scrolling_enabled()));
+            }
         }
     }
+
+    fn left_handed(&self) -> Option<bool> {
+        self.effective.left_handed.get()
+    }
+
+    fn accel_profile(&self) -> Option<InputDeviceAccelProfile> {
+        let p = self.effective.accel_profile.get()?;
+        let p = match p {
+            LIBINPUT_CONFIG_ACCEL_PROFILE_FLAT => InputDeviceAccelProfile::Flat,
+            LIBINPUT_CONFIG_ACCEL_PROFILE_ADAPTIVE => InputDeviceAccelProfile::Adaptive,
+            _ => return None,
+        };
+        Some(p)
+    }
+
+    fn accel_speed(&self) -> Option<f64> {
+        self.effective.accel_speed.get()
+    }
+
+    fn transform_matrix(&self) -> Option<TransformMatrix> {
+        self.transform_matrix.get()
+    }
+
+    fn tap_enabled(&self) -> Option<bool> {
+        self.effective.tap_enabled.get()
+    }
+
+    fn drag_enabled(&self) -> Option<bool> {
+        self.effective.drag_enabled.get()
+    }
+
+    fn drag_lock_enabled(&self) -> Option<bool> {
+        self.effective.drag_lock_enabled.get()
+    }
+
+    fn natural_scrolling_enabled(&self) -> Option<bool> {
+        self.effective.natural_scrolling_enabled.get()
+    }
 }
 
 impl MetalInputDevice {

src/backends/metal/input.rs

@@ -149,13 +149,21 @@ impl MetalBackend {
                 InputEvent::Axis120 {
                     dist: scroll as _,
                     axis,
-                    inverted: dev.natural_scrolling.get(),
+                    inverted: dev
+                        .effective
+                        .natural_scrolling_enabled
+                        .get()
+                        .unwrap_or_default(),
                 }
             } else {
                 InputEvent::AxisPx {
                     dist: Fixed::from_f64(scroll),
                     axis,
-                    inverted: dev.natural_scrolling.get(),
+                    inverted: dev
+                        .effective
+                        .natural_scrolling_enabled
+                        .get()
+                        .unwrap_or_default(),
                 }
             };
             dev.event(ie);

src/backends/metal/monitor.rs

@@ -287,17 +287,11 @@ impl MetalBackend {
             events: Default::default(),
             cb: Default::default(),
             name: Default::default(),
-            natural_scrolling: Default::default(),
             pressed_keys: Default::default(),
             pressed_buttons: Default::default(),
-            left_handed: Default::default(),
-            accel_profile: Default::default(),
-            accel_speed: Default::default(),
+            desired: Default::default(),
             transform_matrix: Default::default(),
-            tap_enabled: Default::default(),
-            drag_enabled: Default::default(),
-            drag_lock_enabled: Default::default(),
-            natural_scrolling_enabled: Default::default(),
+            effective: Default::default(),
         });
         slots[slot] = Some(dev.clone());
         self.device_holder
@@ -337,8 +331,6 @@ impl MetalBackend {
             };
             inputdev.device().set_slot(slot);
             dev.name.set(Rc::new(inputdev.device().name()));
-            dev.natural_scrolling
-                .set(inputdev.device().natural_scrolling_enabled());
             dev.inputdev.set(Some(inputdev));
             dev.apply_config();
             slf.state

src/libinput/device.rs

@@ -7,13 +7,19 @@ use {
             LIBINPUT_CONFIG_TAP_DISABLED, LIBINPUT_CONFIG_TAP_ENABLED,
         },
         sys::{
-            libinput_device, libinput_device_config_accel_set_profile,
-            libinput_device_config_accel_set_speed, libinput_device_config_left_handed_set,
+            libinput_device, libinput_device_config_accel_get_profile,
+            libinput_device_config_accel_get_speed, libinput_device_config_accel_is_available,
+            libinput_device_config_accel_set_profile, libinput_device_config_accel_set_speed,
+            libinput_device_config_left_handed_get,
+            libinput_device_config_left_handed_is_available,
+            libinput_device_config_left_handed_set,
             libinput_device_config_scroll_get_natural_scroll_enabled,
+            libinput_device_config_scroll_has_natural_scroll,
             libinput_device_config_scroll_set_natural_scroll_enabled,
             libinput_device_config_tap_get_drag_enabled,
             libinput_device_config_tap_get_drag_lock_enabled,
-            libinput_device_config_tap_get_enabled, libinput_device_config_tap_set_drag_enabled,
+            libinput_device_config_tap_get_enabled, libinput_device_config_tap_get_finger_count,
+            libinput_device_config_tap_set_drag_enabled,
             libinput_device_config_tap_set_drag_lock_enabled,
             libinput_device_config_tap_set_enabled, libinput_device_get_name,
             libinput_device_get_user_data, libinput_device_has_capability,
@@ -64,12 +70,32 @@ impl<'a> LibInputDevice<'a> {
         res != 0
     }
 
+    pub fn left_handed_available(&self) -> bool {
+        unsafe { libinput_device_config_left_handed_is_available(self.dev) != 0 }
+    }
+
+    pub fn left_handed(&self) -> bool {
+        unsafe { libinput_device_config_left_handed_get(self.dev) != 0 }
+    }
+
     pub fn set_left_handed(&self, left_handed: bool) {
         unsafe {
             libinput_device_config_left_handed_set(self.dev, left_handed as _);
         }
     }
 
+    pub fn accel_available(&self) -> bool {
+        unsafe { libinput_device_config_accel_is_available(self.dev) != 0 }
+    }
+
+    pub fn accel_profile(&self) -> AccelProfile {
+        unsafe { AccelProfile(libinput_device_config_accel_get_profile(self.dev)) }
+    }
+
+    pub fn accel_speed(&self) -> f64 {
+        unsafe { libinput_device_config_accel_get_speed(self.dev) }
+    }
+
     pub fn set_accel_profile(&self, profile: AccelProfile) {
         unsafe {
             libinput_device_config_accel_set_profile(self.dev, profile.raw() as _);
@@ -99,7 +125,10 @@ impl<'a> LibInputDevice<'a> {
         }
     }
 
-    #[allow(dead_code)]
+    pub fn tap_available(&self) -> bool {
+        unsafe { libinput_device_config_tap_get_finger_count(self.dev) != 0 }
+    }
+
     pub fn tap_enabled(&self) -> bool {
         let enabled = unsafe { ConfigTapState(libinput_device_config_tap_get_enabled(self.dev)) };
         match enabled {
@@ -158,6 +187,10 @@ impl<'a> LibInputDevice<'a> {
     pub fn natural_scrolling_enabled(&self) -> bool {
         unsafe { libinput_device_config_scroll_get_natural_scroll_enabled(self.dev) != 0 }
     }
+
+    pub fn has_natural_scrolling(&self) -> bool {
+        unsafe { libinput_device_config_scroll_has_natural_scroll(self.dev) != 0 }
+    }
 }
 
 impl RegisteredDevice {

src/libinput/sys.rs

@@ -41,19 +41,29 @@ extern "C" {
         device: *mut libinput_device,
         cap: libinput_device_capability,
     ) -> c::c_int;
+    pub fn libinput_device_config_left_handed_is_available(
+        device: *mut libinput_device,
+    ) -> c::c_int;
+    pub fn libinput_device_config_left_handed_get(device: *mut libinput_device) -> c::c_int;
     pub fn libinput_device_config_left_handed_set(
         device: *mut libinput_device,
         left_handed: c::c_int,
     ) -> libinput_config_status;
+    pub fn libinput_device_config_accel_is_available(device: *mut libinput_device) -> c::c_int;
+    pub fn libinput_device_config_accel_get_profile(
+        device: *mut libinput_device,
+    ) -> libinput_config_accel_profile;
     pub fn libinput_device_config_accel_set_profile(
         device: *mut libinput_device,
         profile: libinput_config_accel_profile,
     ) -> libinput_config_status;
+    pub fn libinput_device_config_accel_get_speed(device: *mut libinput_device) -> f64;
     pub fn libinput_device_config_accel_set_speed(
         device: *mut libinput_device,
         speed: f64,
     ) -> libinput_config_status;
     pub fn libinput_device_get_name(device: *mut libinput_device) -> *const c::c_char;
+    pub fn libinput_device_config_tap_get_finger_count(device: *mut libinput_device) -> c::c_int;
     pub fn libinput_device_config_tap_set_enabled(
         device: *mut libinput_device,
         enable: libinput_config_tap_state,
@@ -82,6 +92,9 @@ extern "C" {
     pub fn libinput_device_config_scroll_get_natural_scroll_enabled(
         device: *mut libinput_device,
     ) -> c::c_int;
+    pub fn libinput_device_config_scroll_has_natural_scroll(
+        device: *mut libinput_device,
+    ) -> c::c_int;
 
     pub fn libinput_event_destroy(event: *mut libinput_event);
     pub fn libinput_event_get_type(event: *mut libinput_event) -> libinput_event_type;