put dnd icon in the right place

include/rootston/seat.h

@@ -26,6 +26,9 @@ struct roots_seat {
 	struct wl_list link;
 	struct wl_list drag_icons;
 
+	// coordinates of the touch grab if one exists
+	double touch_grab_x, touch_grab_y;
+
 	struct roots_view *focus;
 
 	struct wl_list keyboards;

include/wlr/types/wlr_seat.h

@@ -321,6 +321,11 @@ uint32_t wlr_seat_pointer_notify_button(struct wlr_seat *wlr_seat,
 void wlr_seat_pointer_notify_axis(struct wlr_seat *wlr_seat, uint32_t time,
 		enum wlr_axis_orientation orientation, double value);
 
+/**
+ * Whether or not the pointer has a grab other than the default grab.
+ */
+bool wlr_seat_pointer_has_grab(struct wlr_seat *seat);
+
 /**
  * Set this keyboard as the active keyboard for the seat.
  */
@@ -388,6 +393,11 @@ void wlr_seat_keyboard_enter(struct wlr_seat *wlr_seat,
  */
 void wlr_seat_keyboard_clear_focus(struct wlr_seat *wlr_seat);
 
+/**
+ * Whether or not the keyboard has a grab other than the default grab
+ */
+bool wlr_seat_keyboard_has_grab(struct wlr_seat *seat);
+
 /**
  * Start a grab of the touch device of this seat. The grabber is responsible for
  * handling all touch events until the grab ends.
@@ -477,4 +487,9 @@ void wlr_seat_touch_send_up(struct wlr_seat *seat, uint32_t time,
 void wlr_seat_touch_send_motion(struct wlr_seat *seat, uint32_t time,
 		int32_t touch_id, double sx, double sy);
 
+/**
+ * Whether or not the seat has a touch grab other than the default grab.
+ */
+bool wlr_seat_touch_has_grab(struct wlr_seat *seat);
+
 #endif

rootston/cursor.c

@@ -270,6 +270,11 @@ void roots_cursor_handle_touch_motion(struct roots_cursor *cursor,
 		wlr_seat_touch_point_clear_focus(cursor->seat->seat, event->time_msec,
 			event->slot);
 	}
+
+	if (wlr_seat_touch_has_grab(cursor->seat->seat)) {
+		cursor->seat->touch_grab_x = lx;
+		cursor->seat->touch_grab_y = ly;
+	}
 }
 
 void roots_cursor_handle_tool_axis(struct roots_cursor *cursor,

rootston/output.c

@@ -209,8 +209,8 @@ static void output_frame_notify(struct wl_listener *listener, void *data) {
 				struct wlr_touch_point *point =
 					wlr_seat_touch_get_point(seat->seat, drag_icon->touch_id);
 				if (point) {
-					icon_x = point->sx + drag_icon->sx; // TODO plus view x
+					icon_x = seat->touch_grab_x + drag_icon->sx;
-					icon_y = point->sy + drag_icon->sy; // TODO plus view y
+					icon_y = seat->touch_grab_y + drag_icon->sy;
 					render_surface(icon, desktop, wlr_output, &now, icon_x, icon_y, 0);
 				}
 			}

types/wlr_seat.c

@@ -672,6 +672,10 @@ void wlr_seat_pointer_notify_axis(struct wlr_seat *wlr_seat, uint32_t time,
 	grab->interface->axis(grab, time, orientation, value);
 }
 
+bool wlr_seat_pointer_has_grab(struct wlr_seat *seat) {
+	return seat->pointer_state.grab->interface != &default_pointer_grab_impl;
+}
+
 void wlr_seat_keyboard_send_key(struct wlr_seat *wlr_seat, uint32_t time,
 		uint32_t key, uint32_t state) {
 	struct wlr_seat_client *client = wlr_seat->keyboard_state.focused_client;
@@ -869,6 +873,10 @@ void wlr_seat_keyboard_clear_focus(struct wlr_seat *seat) {
 	wlr_seat_keyboard_enter(seat, NULL);
 }
 
+bool wlr_seat_keyboard_has_grab(struct wlr_seat *seat) {
+	return seat->keyboard_state.grab->interface != &default_keyboard_grab_impl;
+}
+
 void wlr_seat_keyboard_notify_modifiers(struct wlr_seat *seat) {
 	clock_gettime(CLOCK_MONOTONIC, &seat->last_event);
 	struct wlr_seat_keyboard_grab *grab = seat->keyboard_state.grab;
@@ -1129,3 +1137,7 @@ void wlr_seat_touch_send_motion(struct wlr_seat *seat, uint32_t time, int32_t to
 		wl_fixed_from_double(sx), wl_fixed_from_double(sy));
 	wl_touch_send_frame(point->client->touch);
 }
+
+bool wlr_seat_touch_has_grab(struct wlr_seat *seat) {
+	return seat->touch_state.grab->interface != &default_touch_grab_impl;
+}