config: allow setting per-device scroll wheel speed

jay-config/src/_private/client.rs

@@ -532,6 +532,10 @@ impl Client {
         self.send(&ClientMessage::SetTransformMatrix { device, matrix })
     }
 
+    pub fn set_px_per_wheel_scroll(&self, device: InputDevice, px: f64) {
+        self.send(&ClientMessage::SetPxPerWheelScroll { device, px })
+    }
+
     pub fn device_name(&self, device: InputDevice) -> String {
         let res = self.send_with_response(&ClientMessage::GetDeviceName { device });
         get_response!(res, String::new(), GetDeviceName { name });

jay-config/src/_private/ipc.rs

@@ -270,6 +270,10 @@ pub enum ClientMessage<'a> {
     SetFont {
         font: &'a str,
     },
+    SetPxPerWheelScroll {
+        device: InputDevice,
+        px: f64,
+    },
 }
 
 #[derive(Encode, Decode, Debug)]

jay-config/src/input.rs

@@ -71,6 +71,18 @@ impl InputDevice {
     pub fn name(self) -> String {
         get!(String::new()).device_name(self)
     }
+
+    /// Sets how many pixel to scroll per scroll wheel dedent.
+    ///
+    /// Default: `15.0`
+    ///
+    /// This setting has no effect on non-wheel input such as touchpads.
+    ///
+    /// Some mouse wheels support high-resolution scrolling without discrete steps. In
+    /// this case a value proportional to this setting will be used.
+    pub fn set_px_per_wheel_scroll(self, px: f64) {
+        get!().set_px_per_wheel_scroll(self, px);
+    }
 }
 
 /// A seat.

src/config/handler.rs

@@ -487,6 +487,12 @@ impl ConfigProxyHandler {
         Ok(())
     }
 
+    fn handle_set_px_per_wheel_scroll(&self, device: InputDevice, px: f64) -> Result<(), CphError> {
+        let dev = self.get_device_handler_data(device)?;
+        dev.px_per_scroll_wheel.set(px);
+        Ok(())
+    }
+
     fn handle_set_transform_matrix(
         &self,
         device: InputDevice,
@@ -1077,6 +1083,9 @@ impl ConfigProxyHandler {
             ClientMessage::ResetFont => self.handle_reset_font(),
             ClientMessage::GetFont => self.handle_get_font(),
             ClientMessage::SetFont { font } => self.handle_set_font(font),
+            ClientMessage::SetPxPerWheelScroll { device, px } => self
+                .handle_set_px_per_wheel_scroll(device, px)
+                .wrn("set_px_per_wheel_scroll")?,
         }
         Ok(())
     }

src/ifs/wl_seat/event_handling.rs

@@ -20,10 +20,11 @@ use {
                     WHEEL_TILT_SINCE_VERSION,
                 },
                 zwp_relative_pointer_v1::ZwpRelativePointerV1,
-                Dnd, SeatId, WlSeat, WlSeatGlobal, CHANGE_CURSOR_MOVED, PX_PER_SCROLL,
+                Dnd, SeatId, WlSeat, WlSeatGlobal, CHANGE_CURSOR_MOVED,
             },
             wl_surface::{xdg_surface::xdg_popup::XdgPopup, WlSurface},
         },
+        state::DeviceHandlerData,
         tree::{Direction, FloatNode, Node, ToplevelNode},
         utils::{bitflags::BitflagsExt, clonecell::CloneCell, smallmap::SmallMap},
         wire::WlDataOfferId,
@@ -166,7 +167,7 @@ impl NodeSeatState {
 }
 
 impl WlSeatGlobal {
-    pub fn event(self: &Rc<Self>, event: InputEvent) {
+    pub fn event(self: &Rc<Self>, dev: &DeviceHandlerData, event: InputEvent) {
         match event {
             InputEvent::Key {
                 time_usec,
@@ -196,7 +197,7 @@ impl WlSeatGlobal {
             InputEvent::Axis120 { dist, axis } => self.pointer_owner.axis_120(dist, axis),
             InputEvent::AxisSmooth { dist, axis } => self.pointer_owner.axis_smooth(dist, axis),
             InputEvent::AxisStop { axis } => self.pointer_owner.axis_stop(axis),
-            InputEvent::AxisFrame { time_usec } => self.pointer_owner.frame(self, time_usec),
+            InputEvent::AxisFrame { time_usec } => self.pointer_owner.frame(dev, self, time_usec),
         }
     }
 
@@ -537,7 +538,12 @@ impl WlSeatGlobal {
 
 // Scroll callbacks
 impl WlSeatGlobal {
-    pub fn scroll_surface(&self, surface: &WlSurface, event: &PendingScroll) {
+    pub fn scroll_surface(
+        &self,
+        dev: &DeviceHandlerData,
+        surface: &WlSurface,
+        event: &PendingScroll,
+    ) {
         if let Some(source) = event.source.get() {
             let since = if source >= WHEEL_TILT {
                 WHEEL_TILT_SINCE_VERSION
@@ -556,7 +562,7 @@ impl WlSeatGlobal {
                     } else if p.seat.version >= AXIS_DISCRETE_SINCE_VERSION {
                         p.send_axis_discrete(axis, delta / AXIS_120);
                     }
-                    let px = (delta as f64 / AXIS_120 as f64) * PX_PER_SCROLL;
+                    let px = (delta as f64 / AXIS_120 as f64) * dev.px_per_scroll_wheel.get();
                     p.send_axis(time, axis, Fixed::from_f64(px));
                 } else if let Some(delta) = event.smooth[i].get() {
                     p.send_axis(time, axis, delta);

src/ifs/wl_seat/pointer_owner.rs

@@ -8,6 +8,7 @@ use {
             wl_seat::{wl_pointer::PendingScroll, Dnd, DroppedDnd, WlSeatError, WlSeatGlobal},
             wl_surface::WlSurface,
         },
+        state::DeviceHandlerData,
         tree::{FoundNode, Node},
         utils::{clonecell::CloneCell, smallmap::SmallMap},
     },
@@ -51,11 +52,11 @@ impl PointerOwnerHolder {
         self.pending_scroll.stop[axis as usize].set(true);
     }
 
-    pub fn frame(&self, seat: &Rc<WlSeatGlobal>, time_usec: u64) {
+    pub fn frame(&self, dev: &DeviceHandlerData, seat: &Rc<WlSeatGlobal>, time_usec: u64) {
         self.pending_scroll.time_usec.set(time_usec);
         let pending = self.pending_scroll.take();
         if let Some(node) = self.owner.get().axis_node(seat) {
-            node.node_on_axis_event(seat, &pending);
+            node.node_on_axis_event(dev, seat, &pending);
         }
     }
 

src/ifs/wl_surface.rs

@@ -25,6 +25,7 @@ use {
         object::Object,
         rect::{Rect, Region},
         render::Renderer,
+        state::DeviceHandlerData,
         tree::{FindTreeResult, FoundNode, Node, NodeId, NodeVisitor, ToplevelNode},
         utils::{
             buffd::{MsgParser, MsgParserError},
@@ -779,8 +780,13 @@ impl Node for WlSurface {
         seat.button_surface(&self, time_usec, button, state, serial);
     }
 
-    fn node_on_axis_event(self: Rc<Self>, seat: &Rc<WlSeatGlobal>, event: &PendingScroll) {
-        seat.scroll_surface(&*self, event);
+    fn node_on_axis_event(
+        self: Rc<Self>,
+        dev: &DeviceHandlerData,
+        seat: &Rc<WlSeatGlobal>,
+        event: &PendingScroll,
+    ) {
+        seat.scroll_surface(dev, &*self, event);
     }
 
     fn node_on_focus(self: Rc<Self>, seat: &Rc<WlSeatGlobal>) {

src/state.rs

@@ -173,6 +173,7 @@ pub struct InputDeviceData {
 
 pub struct DeviceHandlerData {
     pub seat: CloneCell<Option<Rc<WlSeatGlobal>>>,
+    pub px_per_scroll_wheel: Cell<f64>,
     pub device: Rc<dyn InputDevice>,
 }
 

src/tasks/input_device.rs

@@ -1,15 +1,17 @@
 use {
     crate::{
         backend::InputDevice,
+        ifs::wl_seat::PX_PER_SCROLL,
         state::{DeviceHandlerData, InputDeviceData, State},
         utils::asyncevent::AsyncEvent,
     },
-    std::rc::Rc,
+    std::{cell::Cell, rc::Rc},
 };
 
 pub fn handle(state: &Rc<State>, dev: Rc<dyn InputDevice>) {
     let data = Rc::new(DeviceHandlerData {
         seat: Default::default(),
+        px_per_scroll_wheel: Cell::new(PX_PER_SCROLL),
         device: dev.clone(),
     });
     let ae = Rc::new(AsyncEvent::default());
@@ -54,7 +56,7 @@ impl DeviceHandler {
             if let Some(seat) = self.data.seat.get() {
                 let mut any_events = false;
                 while let Some(event) = self.dev.event() {
-                    seat.event(event);
+                    seat.event(&self.data, event);
                     any_events = true;
                 }
                 if any_events {

src/tree.rs

@@ -9,6 +9,7 @@ use {
         },
         rect::Rect,
         render::Renderer,
+        state::DeviceHandlerData,
         utils::numcell::NumCell,
         xkbcommon::ModifierState,
     },
@@ -184,7 +185,13 @@ pub trait Node: 'static {
         let _ = serial;
     }
 
-    fn node_on_axis_event(self: Rc<Self>, seat: &Rc<WlSeatGlobal>, event: &PendingScroll) {
+    fn node_on_axis_event(
+        self: Rc<Self>,
+        dev: &DeviceHandlerData,
+        seat: &Rc<WlSeatGlobal>,
+        event: &PendingScroll,
+    ) {
+        let _ = dev;
         let _ = seat;
         let _ = event;
     }

src/tree/container.rs

@@ -9,7 +9,7 @@ use {
         },
         rect::Rect,
         render::{Renderer, Texture},
-        state::State,
+        state::{DeviceHandlerData, State},
         text,
         tree::{
             walker::NodeVisitor, ContainingNode, Direction, FindTreeResult, FoundNode, Node,
@@ -1145,7 +1145,12 @@ impl Node for ContainerNode {
         }
     }
 
-    fn node_on_axis_event(self: Rc<Self>, seat: &Rc<WlSeatGlobal>, event: &PendingScroll) {
+    fn node_on_axis_event(
+        self: Rc<Self>,
+        _dev: &DeviceHandlerData,
+        seat: &Rc<WlSeatGlobal>,
+        event: &PendingScroll,
+    ) {
         let mut seat_datas = self.seats.borrow_mut();
         let seat_data = match seat_datas.get_mut(&seat.id()) {
             Some(s) => s,

src/tree/output.rs

@@ -17,7 +17,7 @@ use {
         },
         rect::Rect,
         render::{Renderer, Texture},
-        state::State,
+        state::{DeviceHandlerData, State},
         text,
         tree::{
             walker::NodeVisitor, Direction, FindTreeResult, FoundNode, Node, NodeId, WorkspaceNode,
@@ -512,7 +512,12 @@ impl Node for OutputNode {
         self.state.tree_changed();
     }
 
-    fn node_on_axis_event(self: Rc<Self>, seat: &Rc<WlSeatGlobal>, event: &PendingScroll) {
+    fn node_on_axis_event(
+        self: Rc<Self>,
+        _dev: &DeviceHandlerData,
+        seat: &Rc<WlSeatGlobal>,
+        event: &PendingScroll,
+    ) {
         let steps = match self.scroll.handle(event) {
             Some(e) => e,
             _ => return,