ei: implement ei_touchscreen v2

src/ei/ei_ifs/ei_device.rs

@@ -233,6 +233,7 @@ impl EiDeviceRequestHandler for EiDevice {
                         seat.touch_motion_at(time, id, x, y);
                     }
                     TouchChange::Up => seat.touch_up(time, id),
+                    TouchChange::Cancel => seat.touch_cancel(time, id),
                 }
             }
             seat.touch_frame(time);

src/ei/ei_ifs/ei_seat.rs

@@ -197,6 +197,19 @@ impl EiSeat {
         }
     }
 
+    pub fn handle_touch_cancel(&self, id: u32) {
+        if self.is_sender() {
+            return;
+        }
+        if let Some(b) = self.touchscreen.get() {
+            if self.client.versions.ei_touchscreen() >= EiVersion(2) {
+                b.send_cancel(id);
+            } else {
+                b.send_up(id);
+            }
+        }
+    }
+
     pub fn handle_touch_frame(&self, time_usec: u64) {
         if self.is_sender() {
             return;

src/ei/ei_ifs/ei_touchscreen.rs

@@ -10,8 +10,8 @@ use {
         utils::clonecell::UnsafeCellCloneSafe,
         wire_ei::{
             ei_touchscreen::{
-                ClientDown, ClientMotion, ClientUp, EiTouchscreenRequestHandler, Release,
-                ServerDown, ServerMotion, ServerUp,
+                ClientCancel, ClientDown, ClientMotion, ClientUp, EiTouchscreenRequestHandler,
+                Release, ServerCancel, ServerDown, ServerMotion, ServerUp,
             },
             EiTouchscreenId,
         },
@@ -33,6 +33,7 @@ pub enum TouchChange {
     Down(f32, f32),
     Motion(f32, f32),
     Up,
+    Cancel,
 }
 
 unsafe impl UnsafeCellCloneSafe for TouchChange {}
@@ -65,12 +66,22 @@ impl EiTouchscreen {
         });
     }
 
+    pub fn send_cancel(&self, touchid: u32) {
+        self.client.event(ServerCancel {
+            self_id: self.id,
+            touchid,
+        });
+    }
+
     fn set_client_event(&self, touchid: u32, event: TouchChange) -> Result<(), EiTouchscreenError> {
         match self.device.touch_changes.lock().entry(touchid) {
             Entry::Occupied(mut o) => {
                 use TouchChange::*;
                 match (o.get(), event) {
-                    (Motion(_, _), Motion(_, _)) | (Down(_, _), Down(_, _)) | (Up, Up) => {
+                    (Motion(_, _), Motion(_, _))
+                    | (Down(_, _), Down(_, _))
+                    | (Up, Up)
+                    | (Cancel, Cancel) => {
                         o.insert(event);
                         Ok(())
                     }
@@ -104,6 +115,10 @@ impl EiTouchscreenRequestHandler for EiTouchscreen {
     fn client_up(&self, req: ClientUp, _slf: &Rc<Self>) -> Result<(), Self::Error> {
         self.set_client_event(req.touchid, TouchChange::Up)
     }
+
+    fn client_cancel(&self, req: ClientCancel, _slf: &Rc<Self>) -> Result<(), Self::Error> {
+        self.set_client_event(req.touchid, TouchChange::Cancel)
+    }
 }
 
 ei_object_base! {

src/ifs/wl_seat/event_handling.rs

@@ -761,9 +761,9 @@ impl WlSeatGlobal {
         self.touch_owner.motion(self, time_usec, id, x, y);
     }
 
-    fn touch_cancel(self: &Rc<Self>, time_usec: u64, id: i32) {
+    pub fn touch_cancel(self: &Rc<Self>, time_usec: u64, id: i32) {
         self.for_each_ei_seat(|ei_seat| {
-            ei_seat.handle_touch_up(id as _);
+            ei_seat.handle_touch_cancel(id as _);
         });
         self.state.for_each_seat_tester(|t| {
             t.send_touch_cancel(self.id, time_usec, id);

wire-ei/ei_touchscreen.txt

@@ -17,6 +17,10 @@ request client_up (sender) {
     touchid: u32,
 }
 
+request client_cancel (sender, since = 2) {
+    touchid: u32,
+}
+
 event destroyed {
     serial: u32,
 }
@@ -36,3 +40,7 @@ event server_motion (receiver) {
 event server_up (receiver) {
     touchid: u32,
 }
+
+event server_cancel (receiver, since = 2) {
+    touchid: u32,
+}