Refactor seat operations to use an interface

This splits each seat operation (drag/move tiling/floating etc) into a
separate file and introduces a struct sway_seatop_impl to abstract the
operation.

The move_tiling_threshold operation has been merged into move_tiling.

The main logic for each operation is untouched aside from variable
renames.

The following previously-static functions have been made public:
* node_at_coords
* container_raise_floating
* render_rect
* premultiply_alpha
* scale_box

1 files changed, 14 insertions, 9 deletions

diff --git a/sway/tree/container.c b/sway/tree/container.c
index 99262356..d9c721f5 100644
--- a/sway/tree/container.c
+++ b/sway/tree/container.c
@@ -864,15 +864,7 @@ bool container_has_urgent_child(struct sway_container *container) {
 void container_end_mouse_operation(struct sway_container *container) {
         struct sway_seat *seat;
         wl_list_for_each(seat, &server.input->seats, link) {
-                if (seat->op_container == container) {
-                        seat->op_target_node = NULL; // ensure tiling move doesn't apply
-                        seat_end_mouse_operation(seat);
-                }
-                // If the user is doing a tiling drag over this container,
-                // keep the operation active but unset the target container.
-                if (seat->op_target_node == &container->node) {
-                        seat->op_target_node = NULL;
-                }
+                seatop_unref(seat, container);
         }
 }
 
@@ -1384,3 +1376,16 @@ void container_update_marks_textures(struct sway_container *con) {
                         &config->border_colors.urgent);
         container_damage_whole(con);
 }
+
+void container_raise_floating(struct sway_container *con) {
+        // Bring container to front by putting it at the end of the floating list.
+        struct sway_container *floater = con;
+        while (floater->parent) {
+                floater = floater->parent;
+        }
+        if (container_is_floating(floater)) {
+                list_move_to_end(floater->workspace->floating, floater);
+                node_set_dirty(&floater->workspace->node);
+        }
+}
+