tablet: add tablet tool scroll support

include/sway/input/cursor.h

@@ -63,6 +63,7 @@ struct sway_cursor {
 	struct wl_listener tool_tip;
 	struct wl_listener tool_proximity;
 	struct wl_listener tool_button;
+	struct wl_listener tool_axis_scroll;
 	bool simulating_pointer_from_tool_tip;
 	bool simulating_pointer_from_tool_button;
 	uint32_t tool_buttons;

include/sway/input/seat.h

@@ -48,6 +48,8 @@ struct sway_seatop_impl {
 			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_axis_scroll)(struct sway_seat *seat,
+			struct sway_tablet_tool *tool, struct wlr_tablet_tool_axis_scroll_event *event);
 	void (*tablet_tool_tip)(struct sway_seat *seat, struct sway_tablet_tool *tool,
 			uint32_t time_msec, enum wlr_tablet_tool_tip_state state);
 	void (*end)(struct sway_seat *seat);
@@ -299,6 +301,10 @@ void seatop_pointer_motion(struct sway_seat *seat, uint32_t time_msec);
 void seatop_pointer_axis(struct sway_seat *seat,
 		struct wlr_pointer_axis_event *event);
 
+void seatop_tablet_tool_axis_scroll(struct sway_seat *seat,
+		struct sway_tablet_tool *tool,
+		struct wlr_tablet_tool_axis_scroll_event *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/cursor.c

@@ -724,6 +724,38 @@ static void handle_tool_proximity(struct wl_listener *listener, void *data) {
 		0, 0, event->time_msec);
 }
 
+static void handle_tool_axis_scroll(struct wl_listener *listener, void *data) {
+	struct sway_cursor *cursor = wl_container_of(listener, cursor, tool_axis_scroll);
+	struct wlr_tablet_tool_axis_scroll_event *event = data;
+	cursor_handle_activity_from_device(cursor, &event->tablet->base);
+
+	struct sway_tablet_tool *sway_tool = event->tool->data;
+	struct wlr_tablet_v2_tablet *tablet_v2 = sway_tool->tablet->tablet_v2;
+	struct sway_seat *seat = cursor->seat;
+
+
+	double sx, sy;
+	struct wlr_surface *surface = NULL;
+	node_at_coords(seat, cursor->cursor->x, cursor->cursor->y,
+		&surface, &sx, &sy);
+
+	if (surface && wlr_surface_accepts_tablet_v2(tablet_v2, surface)) {
+		sway_log(SWAY_DEBUG, "axis_scroll, accepts tablet");
+		seatop_tablet_tool_axis_scroll(cursor->seat, sway_tool, event);
+	} else {
+		struct wlr_pointer_axis_event simulated_pointer_event = {
+			.pointer = NULL, // FIXME
+			.time_msec = event->time_msec,
+			.source = event->source,
+			.orientation = event->orientation,
+			.delta = event->delta,
+			.delta_discrete = 0,
+		};
+		seatop_pointer_axis(cursor->seat, &simulated_pointer_event);
+		sway_log(SWAY_DEBUG, "axis_scroll, simulating");
+	}
+}
+
 static void handle_tool_button(struct wl_listener *listener, void *data) {
 	struct sway_cursor *cursor = wl_container_of(listener, cursor, tool_button);
 	struct wlr_tablet_tool_button_event *event = data;
@@ -1140,6 +1172,9 @@ struct sway_cursor *sway_cursor_create(struct sway_seat *seat) {
 	wl_signal_add(&wlr_cursor->events.tablet_tool_proximity, &cursor->tool_proximity);
 	cursor->tool_proximity.notify = handle_tool_proximity;
 
+	wl_signal_add(&wlr_cursor->events.tablet_tool_axis_scroll, &cursor->tool_axis_scroll);
+	cursor->tool_axis_scroll.notify = handle_tool_axis_scroll;
+
 	wl_signal_add(&wlr_cursor->events.tablet_tool_button, &cursor->tool_button);
 	cursor->tool_button.notify = handle_tool_button;
 

sway/input/seat.c

@@ -1576,6 +1576,14 @@ void seatop_pointer_axis(struct sway_seat *seat,
 	}
 }
 
+void seatop_tablet_tool_axis_scroll(struct sway_seat *seat,
+		struct sway_tablet_tool *tool,
+		struct wlr_tablet_tool_axis_scroll_event *event) {
+	if (seat->seatop_impl->tablet_tool_axis_scroll) {
+		seat->seatop_impl->tablet_tool_axis_scroll(seat, tool, event);
+	}
+}
+
 void seatop_touch_motion(struct sway_seat *seat, struct wlr_touch_motion_event *event,
 		double lx, double ly) {
 	if (seat->seatop_impl->touch_motion) {

sway/input/seatop_default.c

@@ -795,12 +795,28 @@ static void handle_pointer_axis(struct sway_seat *seat,
 
 	if (!handled) {
 		wlr_seat_pointer_notify_axis(cursor->seat->wlr_seat, event->time_msec,
-			event->orientation, scroll_factor * event->delta, 
+			event->orientation, scroll_factor * event->delta,
 			roundf(scroll_factor * event->delta_discrete), event->source,
 			event->relative_direction);
 	}
 }
 
+static void handle_tablet_tool_axis_scroll(struct sway_seat *seat,
+		struct sway_tablet_tool *tool, struct wlr_tablet_tool_axis_scroll_event *event) {
+	// FIXME: Do nothing except pass it to clients for now
+	struct sway_input_device *input_device =
+		event->tablet ? event->tablet->base.data : NULL;
+	struct input_config *ic =
+		input_device ? input_device_get_config(input_device) : NULL;
+	float scroll_factor =
+		(ic == NULL || ic->scroll_factor == FLT_MIN) ? 1.0f : ic->scroll_factor;
+
+	wlr_tablet_v2_tablet_tool_notify_scroll(tool->tablet_v2_tool, event->time_msec,
+			event->orientation, scroll_factor * event->delta,
+			event->source,
+			event->relative_direction);
+}
+
 /*------------------------------------\
  * Functions used by gesture support  /
  *----------------------------------*/
@@ -1128,6 +1144,7 @@ static const struct sway_seatop_impl seatop_impl = {
 	.pointer_axis = handle_pointer_axis,
 	.tablet_tool_tip = handle_tablet_tool_tip,
 	.tablet_tool_motion = handle_tablet_tool_motion,
+	.tablet_tool_axis_scroll = handle_tablet_tool_axis_scroll,
 	.hold_begin = handle_hold_begin,
 	.hold_end = handle_hold_end,
 	.pinch_begin = handle_pinch_begin,

sway/input/seatop_down.c

@@ -140,6 +140,22 @@ static void handle_pointer_axis(struct sway_seat *seat,
 		event->relative_direction);
 }
 
+static void handle_tablet_tool_axis_scroll(struct sway_seat *seat,
+		struct sway_tablet_tool *tool, struct wlr_tablet_tool_axis_scroll_event *event) {
+	struct sway_input_device *input_device =
+		event->tablet ? event->tablet->base.data : NULL;
+	struct input_config *ic =
+		input_device ? input_device_get_config(input_device) : NULL;
+	float scroll_factor =
+		(ic == NULL || ic->scroll_factor == FLT_MIN) ? 1.0f : ic->scroll_factor;
+
+	wlr_tablet_v2_tablet_tool_notify_scroll(tool->tablet_v2_tool, event->time_msec,
+			event->orientation, scroll_factor * event->delta,
+			event->source,
+			event->relative_direction);
+	seatop_begin_default(seat);
+}
+
 static void handle_button(struct sway_seat *seat, uint32_t time_msec,
 		struct wlr_input_device *device, uint32_t button,
 		enum wl_pointer_button_state state) {
@@ -208,6 +224,7 @@ static const struct sway_seatop_impl seatop_impl = {
 	.pointer_axis = handle_pointer_axis,
 	.tablet_tool_tip = handle_tablet_tool_tip,
 	.tablet_tool_motion = handle_tablet_tool_motion,
+	.tablet_tool_axis_scroll = handle_tablet_tool_axis_scroll,
 	.touch_motion = handle_touch_motion,
 	.touch_up = handle_touch_up,
 	.touch_down = handle_touch_down,