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input: Add pointer-emulation grab for tablet tools

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This commit is contained in:
Victoria Brekenfeld 2026-08-18 19:12:06 +02:00 • committed by Victoria Brekenfeld
parent 6467f79025
commit 9125f8a2a7
3 changed files with 351 additions and 23 deletions
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100
src/input/mod.rs
View file

@ -9,7 +9,10 @@ use crate::{
cosmic_modifiers_from_smithay,
},
},
input::gestures::{GestureState, SwipeAction},
input::{
gestures::{GestureState, SwipeAction},
tablet_emu::PointerEmulationGrab,
},
shell::{
SeatExt, Trigger,
focus::{
@ -52,7 +55,7 @@ use smithay::{
keyboard::KeyboardHandle,
keyboard::{FilterResult, KeyboardSource, KeysymHandle, ModifiersState},
pointer::{
AxisFrame, ButtonEvent as PointerButtonEvent, GestureHoldBeginEvent,
AxisFrame, ButtonEvent as PointerButtonEvent, Focus, GestureHoldBeginEvent,
GestureHoldEndEvent, GesturePinchBeginEvent, GesturePinchEndEvent,
GesturePinchUpdateEvent, GestureSwipeBeginEvent, GestureSwipeEndEvent,
GestureSwipeUpdateEvent, MotionEvent as PointerMotionEvent, PointerGrab, PointerHandle,
@ -89,6 +92,7 @@ use std::{
pub mod actions;
pub mod gestures;
pub mod tablet_emu;
/// Identifies the input backend instance an event came from, used to disambiguate device ids
/// (which are only unique within a single backend instance, see
@ -1609,6 +1613,26 @@ impl State {
let tool = tablet_seat.get_tool(&event.tool());
if let Some(tool) = tool {
let serial = SERIAL_COUNTER.next_serial();
if !tool.is_grabbed()
&& under
.as_ref()
.is_some_and(|(target, _)| !target.supports_tool(&tool))
{
let start_data = tool::GrabStartData {
focus: under.clone(),
trigger: tool::GrabTrigger::Proximity,
location: position.as_logical(),
};
tool.set_grab(
self,
PointerEmulationGrab::new(start_data, seat.clone()),
event.time(),
serial,
Focus::Keep,
);
}
let frame = tool::AxisFrame {
pressure: event.pressure_has_changed().then(|| event.pressure()),
distance: event.distance_has_changed().then(|| event.distance()),
@ -1629,7 +1653,7 @@ impl State {
under,
&tool::MotionEvent {
location: position.as_logical(),
serial: SERIAL_COUNTER.next_serial(),
serial,
time: event.time(),
},
);
@ -1683,6 +1707,25 @@ impl State {
if let Some(tablet) = tablet {
let serial = SERIAL_COUNTER.next_serial();
if !tool.is_grabbed()
&& under
.as_ref()
.is_some_and(|(target, _)| !target.supports_tool(&tool))
{
let start_data = tool::GrabStartData {
focus: under.clone(),
trigger: tool::GrabTrigger::Proximity,
location: position.as_logical(),
};
tool.set_grab(
self,
PointerEmulationGrab::new(start_data, seat.clone()),
event.time(),
serial,
Focus::Keep,
);
}
let frame = tool::AxisFrame {
pressure: event.pressure_has_changed().then(|| event.pressure()),
distance: event.distance_has_changed().then(|| event.distance()),
@ -1697,24 +1740,39 @@ impl State {
};
match event.state() {
ProximityState::In => tool.proximity_in(
self,
under,
tablet,
&tool::ProximityInEvent {
location: position.as_logical(),
axis: Some(frame),
serial: SERIAL_COUNTER.next_serial(),
time: event.time(),
},
),
ProximityState::Out => tool.proximity_out(
self,
&tool::ProximityOutEvent {
serial,
time: event.time(),
},
),
ProximityState::In => {
tool.proximity_in(
self,
under,
tablet,
&tool::ProximityInEvent {
location: position.as_logical(),
axis: Some(frame),
serial,
time: event.time(),
},
);
}
ProximityState::Out => {
tool.proximity_out(
self,
&tool::ProximityOutEvent {
serial,
time: event.time(),
},
);
if let Some(pointer) = seat.get_pointer() {
pointer.motion(
self,
None,
&PointerMotionEvent {
location: position.as_logical(),
serial,
time: event.time(),
},
);
}
}
}
tool.frame(self, event.time());

260
src/input/tablet_emu.rs Normal file
View file

@ -0,0 +1,260 @@
// SPDX-License-Identifier: GPL-3.0-only
//! Pointer Emulating TabletTool grab.
use crate::{shell::focus::target::PointerFocusTarget, state::State};
use smithay::{
backend::input::{ButtonState, InputTime, MouseButton},
input::{
Seat, pointer,
tablet::{
self,
tool::{
AxisFrame, ButtonEvent, DownEvent, GrabStartData, ProximityInEvent,
ProximityOutEvent, TabletToolGrab, TabletToolInnerHandle, UpEvent,
},
},
},
utils::{Logical, Point, SERIAL_COUNTER},
};
// from https://gitlab.freedesktop.org/libinput/libinput/-/blob/main/include/linux/linux/input-event-codes.h
const BTN_STYLUS: u32 = 0x14b;
const BTN_STYLUS_2: u32 = 0x14c;
const BTN_LEFT: u32 = 0x110;
const BTN_RIGHT: u32 = 0x111;
const BTN_MIDDLE: u32 = 0x112;
const BTN_FORWARD: u32 = 0x115;
const BTN_BACK: u32 = 0x116;
pub struct PointerEmulationGrab {
start_data: GrabStartData<State>,
seat: Seat<State>,
above_source: bool,
tip_down: bool,
button_down: Vec<u32>,
}
impl PointerEmulationGrab {
pub fn new(start_data: GrabStartData<State>, seat: Seat<State>) -> Self {
Self {
start_data,
seat,
above_source: true,
tip_down: false,
button_down: Vec::new(),
}
}
fn button_to_mouse(&self, button: u32) -> Option<MouseButton> {
// FIXME: This should be configurable.
if button == BTN_STYLUS {
Some(MouseButton::Right)
} else if button == BTN_STYLUS_2 {
Some(MouseButton::Middle)
} else {
None
}
}
fn pointer_button(&self, data: &mut State, button: MouseButton, state: ButtonState) {
if let Some(pointer) = self.seat.get_pointer() {
let button = match button {
MouseButton::Left => BTN_LEFT,
MouseButton::Right => BTN_RIGHT,
MouseButton::Middle => BTN_MIDDLE,
MouseButton::Back => BTN_BACK,
MouseButton::Forward => BTN_FORWARD,
_ => return,
};
pointer.button(
data,
&pointer::ButtonEvent {
serial: SERIAL_COUNTER.next_serial(),
button,
state,
time: InputTime::now(),
},
);
pointer.frame(data);
}
}
}
type Type = tablet::tool::MotionEvent;
impl TabletToolGrab<State> for PointerEmulationGrab {
fn proximity_in(
&mut self,
data: &mut State,
handle: &mut TabletToolInnerHandle<'_, State>,
focus: Option<(PointerFocusTarget, Point<f64, Logical>)>,
event: &ProximityInEvent,
) {
handle.proximity_in(data, focus.clone(), event);
if !self.above_source && !self.tip_down && self.button_down.is_empty() {
handle.unset_grab(
self,
data,
SERIAL_COUNTER.next_serial(),
InputTime::now(),
true,
);
} else {
if let Some(pointer) = self.seat.get_pointer() {
pointer.motion(
data,
focus,
&pointer::MotionEvent {
location: event.location,
serial: SERIAL_COUNTER.next_serial(),
time: InputTime::now(),
},
);
pointer.frame(data);
}
}
}
fn proximity_out(
&mut self,
data: &mut State,
handle: &mut TabletToolInnerHandle<'_, State>,
event: &ProximityOutEvent,
) {
handle.proximity_out(data, event);
handle.unset_grab(self, data, event.serial, event.time, true);
}
fn down(
&mut self,
data: &mut State,
handle: &mut TabletToolInnerHandle<'_, State>,
event: &DownEvent,
) {
handle.down(data, event);
self.tip_down = true;
self.pointer_button(data, MouseButton::Left, ButtonState::Pressed);
}
fn up(
&mut self,
data: &mut State,
handle: &mut TabletToolInnerHandle<'_, State>,
event: &UpEvent,
) {
handle.up(data, event);
self.pointer_button(data, MouseButton::Left, ButtonState::Released);
self.tip_down = false;
if !self.above_source && !self.tip_down && self.button_down.is_empty() {
handle.unset_grab(self, data, event.serial, event.time, true);
}
}
fn motion(
&mut self,
data: &mut State,
handle: &mut TabletToolInnerHandle<'_, State>,
focus: Option<(PointerFocusTarget, Point<f64, Logical>)>,
event: &Type,
) {
self.above_source = focus.as_ref().map(|(target, _)| target)
== self.start_data.focus.as_ref().map(|(target, _)| target);
handle.motion(data, self.start_data.focus.clone(), event);
if !self.above_source && !self.tip_down && self.button_down.is_empty() {
handle.unset_grab(
self,
data,
SERIAL_COUNTER.next_serial(),
InputTime::now(),
true,
);
} else {
if let Some(pointer) = self.seat.get_pointer() {
pointer.motion(
data,
focus,
&pointer::MotionEvent {
location: event.location,
serial: SERIAL_COUNTER.next_serial(),
time: InputTime::now(),
},
);
pointer.frame(data);
}
}
}
fn button(
&mut self,
data: &mut State,
handle: &mut TabletToolInnerHandle<'_, State>,
event: &ButtonEvent,
) {
handle.button(data, event);
self.button_down.retain(|b| b != &event.button);
if matches!(event.state, ButtonState::Pressed) {
self.button_down.push(event.button);
}
if let Some(button) = self.button_to_mouse(event.button) {
self.pointer_button(data, button, event.state);
}
if !self.above_source && !self.tip_down && self.button_down.is_empty() {
handle.unset_grab(
self,
data,
SERIAL_COUNTER.next_serial(),
InputTime::now(),
true,
);
}
}
fn axis(
&mut self,
data: &mut State,
handle: &mut TabletToolInnerHandle<'_, State>,
frame: AxisFrame,
) {
handle.axis(data, frame);
}
fn frame(
&mut self,
data: &mut State,
handle: &mut TabletToolInnerHandle<'_, State>,
time: InputTime,
) {
handle.frame(data, time);
}
fn unset(&mut self, data: &mut State) {
if self.tip_down {
self.pointer_button(data, MouseButton::Left, ButtonState::Released);
}
let buttons = std::mem::take(&mut self.button_down);
for button in buttons.into_iter() {
if let Some(button) = self.button_to_mouse(button) {
self.pointer_button(data, button, ButtonState::Released);
}
}
}
fn start_data(&self) -> &GrabStartData<State> {
&self.start_data
}
}