1 files changed, 77 insertions, 0 deletions

diff --git a/sway/input/seatop_down.c b/sway/input/seatop_down.c
new file mode 100644
index 00000000..ad11c5ca
--- /dev/null
+++ b/sway/input/seatop_down.c
@@ -0,0 +1,77 @@
+#define _POSIX_C_SOURCE 200809L
+#include <wlr/types/wlr_cursor.h>
+#include "sway/input/cursor.h"
+#include "sway/input/seat.h"
+#include "sway/tree/view.h"
+
+struct seatop_down_event {
+        struct sway_container *con;
+        double ref_lx, ref_ly;         // cursor's x/y at start of op
+        double ref_con_lx, ref_con_ly; // container's x/y at start of op
+        bool moved;
+};
+
+static void handle_motion(struct sway_seat *seat, uint32_t time_msec) {
+        struct seatop_down_event *e = seat->seatop_data;
+        struct sway_container *con = e->con;
+        if (seat_is_input_allowed(seat, con->view->surface)) {
+                double moved_x = seat->cursor->cursor->x - e->ref_lx;
+                double moved_y = seat->cursor->cursor->y - e->ref_ly;
+                double sx = e->ref_con_lx + moved_x;
+                double sy = e->ref_con_ly + moved_y;
+                wlr_seat_pointer_notify_motion(seat->wlr_seat, time_msec, sx, sy);
+        }
+        e->moved = true;
+}
+
+static void handle_finish(struct sway_seat *seat) {
+        struct seatop_down_event *e = seat->seatop_data;
+        // Set the cursor's previous coords to the x/y at the start of the
+        // operation, so the container change will be detected if using
+        // focus_follows_mouse and the cursor moved off the original container
+        // during the operation.
+        seat->cursor->previous.x = e->ref_lx;
+        seat->cursor->previous.y = e->ref_ly;
+        if (e->moved) {
+                cursor_send_pointer_motion(seat->cursor, 0);
+        }
+}
+
+static void handle_abort(struct sway_seat *seat) {
+        cursor_set_image(seat->cursor, "left_ptr", NULL);
+}
+
+static void handle_unref(struct sway_seat *seat, struct sway_container *con) {
+        struct seatop_down_event *e = seat->seatop_data;
+        if (e->con == con) {
+                seatop_abort(seat);
+        }
+}
+
+static const struct sway_seatop_impl seatop_impl = {
+        .motion = handle_motion,
+        .finish = handle_finish,
+        .abort = handle_abort,
+        .unref = handle_unref,
+};
+
+void seatop_begin_down(struct sway_seat *seat,
+                struct sway_container *con, uint32_t button, int sx, int sy) {
+        seatop_abort(seat);
+
+        struct seatop_down_event *e =
+                calloc(1, sizeof(struct seatop_down_event));
+        if (!e) {
+                return;
+        }
+        e->con = con;
+        e->ref_lx = seat->cursor->cursor->x;
+        e->ref_ly = seat->cursor->cursor->y;
+        e->ref_con_lx = sx;
+        e->ref_con_ly = sy;
+        e->moved = false;
+
+        seat->seatop_impl = &seatop_impl;
+        seat->seatop_data = e;
+        seat->seatop_button = button;
+}