Add support for touch cancel events

include/sway/input/cursor.h

@@ -53,6 +53,7 @@ struct sway_cursor {
 
 	struct wl_listener touch_down;
 	struct wl_listener touch_up;
+	struct wl_listener touch_cancel;
 	struct wl_listener touch_motion;
 	struct wl_listener touch_frame;
 	bool simulating_pointer_from_touch;

include/sway/input/seat.h

@@ -44,6 +44,8 @@ struct sway_seatop_impl {
 			struct wlr_touch_up_event *event);
 	void (*touch_down)(struct sway_seat *seat,
 			struct wlr_touch_down_event *event, double lx, double ly);
+	void (*touch_cancel)(struct sway_seat *seat,
+			struct wlr_touch_cancel_event *event);
 	void (*tablet_tool_motion)(struct sway_seat *seat,
 			struct sway_tablet_tool *tool, uint32_t time_msec);
 	void (*tablet_tool_tip)(struct sway_seat *seat, struct sway_tablet_tool *tool,
@@ -338,6 +340,9 @@ void seatop_touch_up(struct sway_seat *seat,
 void seatop_touch_down(struct sway_seat *seat,
 		struct wlr_touch_down_event *event, double lx, double ly);
 
+void seatop_touch_cancel(struct sway_seat *seat,
+		struct wlr_touch_cancel_event *event);
+
 void seatop_rebase(struct sway_seat *seat, uint32_t time_msec);
 
 /**

sway/input/cursor.c

@@ -509,6 +509,24 @@ static void handle_touch_up(struct wl_listener *listener, void *data) {
 	}
 }
 
+static void handle_touch_cancel(struct wl_listener *listener, void *data) {
+	struct sway_cursor *cursor = wl_container_of(listener, cursor, touch_cancel);
+	struct wlr_touch_cancel_event *event = data;
+	cursor_handle_activity_from_device(cursor, &event->touch->base);
+
+	struct sway_seat *seat = cursor->seat;
+
+	if (cursor->simulating_pointer_from_touch) {
+		if (cursor->pointer_touch_id == cursor->seat->touch_id) {
+			cursor->pointer_touch_up = true;
+			dispatch_cursor_button(cursor, &event->touch->base,
+				event->time_msec, BTN_LEFT, WLR_BUTTON_RELEASED);
+		}
+	} else {
+		seatop_touch_cancel(seat, event);
+	}
+}
+
 static void handle_touch_motion(struct wl_listener *listener, void *data) {
 	struct sway_cursor *cursor =
 		wl_container_of(listener, cursor, touch_motion);
@@ -1100,6 +1118,7 @@ void sway_cursor_destroy(struct sway_cursor *cursor) {
 	wl_list_remove(&cursor->frame.link);
 	wl_list_remove(&cursor->touch_down.link);
 	wl_list_remove(&cursor->touch_up.link);
+	wl_list_remove(&cursor->touch_cancel.link);
 	wl_list_remove(&cursor->touch_motion.link);
 	wl_list_remove(&cursor->touch_frame.link);
 	wl_list_remove(&cursor->tool_axis.link);
@@ -1181,6 +1200,9 @@ struct sway_cursor *sway_cursor_create(struct sway_seat *seat) {
 	wl_signal_add(&wlr_cursor->events.touch_up, &cursor->touch_up);
 	cursor->touch_up.notify = handle_touch_up;
 
+	wl_signal_add(&wlr_cursor->events.touch_cancel, &cursor->touch_cancel);
+	cursor->touch_cancel.notify = handle_touch_cancel;
+
 	wl_signal_add(&wlr_cursor->events.touch_motion,
 		&cursor->touch_motion);
 	cursor->touch_motion.notify = handle_touch_motion;

sway/input/seat.c

@@ -1638,6 +1638,12 @@ void seatop_touch_down(struct sway_seat *seat, struct wlr_touch_down_event *even
 	}
 }
 
+void seatop_touch_cancel(struct sway_seat *seat, struct wlr_touch_cancel_event *event) {
+	if (seat->seatop_impl->touch_cancel) {
+		seat->seatop_impl->touch_cancel(seat, event);
+	}
+}
+
 void seatop_tablet_tool_tip(struct sway_seat *seat,
 		struct sway_tablet_tool *tool, uint32_t time_msec,
 		enum wlr_tablet_tool_tip_state state) {

sway/input/seatop_down.c

@@ -104,6 +104,24 @@ static void handle_touch_down(struct sway_seat *seat,
 	}
 }
 
+static void handle_touch_cancel(struct sway_seat *seat,
+		struct wlr_touch_cancel_event *event) {
+	struct seatop_down_event *e = seat->seatop_data;
+	struct seatop_touch_point_event *point_event, *tmp;
+
+	wl_list_for_each_safe(point_event, tmp, &e->point_events, link) {
+		if (point_event->touch_id == event->touch_id) {
+			wl_list_remove(&point_event->link);
+			free(point_event);
+			break;
+		}
+	}
+
+	if (e->surface) {
+		wlr_seat_touch_notify_cancel(seat->wlr_seat, e->surface);
+	}
+}
+
 static void handle_pointer_axis(struct sway_seat *seat,
 		struct wlr_pointer_axis_event *event) {
 	struct sway_input_device *input_device =
@@ -189,6 +207,7 @@ static const struct sway_seatop_impl seatop_impl = {
 	.touch_motion = handle_touch_motion,
 	.touch_up = handle_touch_up,
 	.touch_down = handle_touch_down,
+	.touch_cancel = handle_touch_cancel,
 	.unref = handle_unref,
 	.end = handle_end,
 	.allow_set_cursor = true,