Implement seatop_touch

Atm we got issue with the touch position sent to the clients. While
holding contact, leaving the initial container will continue to send
motion event to the client but with the new local position from the new
container.

This seatop goal is to send the position of the touch event, relatively
to the initial container layout position.

1 files changed, 34 insertions, 3 deletions

diff --git a/sway/input/seatop_default.c b/sway/input/seatop_default.c
index 0dcb87ab..5a55c186 100644
--- a/sway/input/seatop_default.c
+++ b/sway/input/seatop_default.c
@@ -261,7 +261,7 @@ static void handle_tablet_tool_tip(struct sway_seat *seat,
 
                 // Handle tapping on a container surface
                 seat_set_focus_container(seat, cont);
-                seatop_begin_down(seat, node->sway_container, time_msec, sx, sy);
+                seatop_begin_down(seat, node->sway_container, sx, sy);
         }
 #if HAVE_XWAYLAND
         // Handle tapping on an xwayland unmanaged view
@@ -374,7 +374,7 @@ static void handle_button(struct sway_seat *seat, uint32_t time_msec,
                         transaction_commit_dirty();
                 }
                 if (state == WLR_BUTTON_PRESSED) {
-                        seatop_begin_down_on_surface(seat, surface, time_msec, sx, sy);
+                        seatop_begin_down_on_surface(seat, surface, sx, sy);
                 }
                 seat_pointer_notify_button(seat, time_msec, button, state);
                 return;
@@ -499,7 +499,7 @@ static void handle_button(struct sway_seat *seat, uint32_t time_msec,
 
         // Handle mousedown on a container surface
         if (surface && cont && state == WLR_BUTTON_PRESSED) {
-                seatop_begin_down(seat, cont, time_msec, sx, sy);
+                seatop_begin_down(seat, cont, sx, sy);
                 seat_pointer_notify_button(seat, time_msec, button, WLR_BUTTON_PRESSED);
                 return;
         }
@@ -649,6 +649,36 @@ static void handle_tablet_tool_motion(struct sway_seat *seat,
         e->previous_node = node;
 }
 
+static void handle_touch_down(struct sway_seat *seat,
+                struct wlr_touch_down_event *event, double lx, double ly) {
+        struct wlr_surface *surface = NULL;
+        struct wlr_seat *wlr_seat = seat->wlr_seat;
+        struct sway_cursor *cursor = seat->cursor;
+        double sx, sy;
+        node_at_coords(seat, seat->touch_x, seat->touch_y, &surface, &sx, &sy);
+
+        if (surface && wlr_surface_accepts_touch(wlr_seat, surface)) {
+                if (seat_is_input_allowed(seat, surface)) {
+                        cursor->simulating_pointer_from_touch = false;
+                        seatop_begin_touch_down(seat, surface, event, sx, sy, lx, ly);
+                }
+        } else if (!cursor->simulating_pointer_from_touch &&
+                        (!surface || seat_is_input_allowed(seat, surface))) {
+                // Fallback to cursor simulation.
+                // The pointer_touch_id state is needed, so drags are not aborted when over
+                // a surface supporting touch and multi touch events don't interfere.
+                cursor->simulating_pointer_from_touch = true;
+                cursor->pointer_touch_id = seat->touch_id;
+                double dx, dy;
+                dx = seat->touch_x - cursor->cursor->x;
+                dy = seat->touch_y - cursor->cursor->y;
+                pointer_motion(cursor, event->time_msec, &event->touch->base, dx, dy,
+                                dx, dy);
+                dispatch_cursor_button(cursor, &event->touch->base, event->time_msec,
+                                BTN_LEFT, WLR_BUTTON_PRESSED);
+        }
+}
+
 /*----------------------------------------\
  * Functions used by handle_pointer_axis  /
  *--------------------------------------*/
@@ -1096,6 +1126,7 @@ static const struct sway_seatop_impl seatop_impl = {
         .swipe_begin = handle_swipe_begin,
         .swipe_update = handle_swipe_update,
         .swipe_end = handle_swipe_end,
+        .touch_down = handle_touch_down,
         .rebase = handle_rebase,
         .allow_set_cursor = true,
 };