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

15 files changed, 857 insertions, 614 deletions

diff --git a/sway/desktop/output.c b/sway/desktop/output.c
index 79ad7faa..04c9b4f6 100644
--- a/sway/desktop/output.c
+++ b/sway/desktop/output.c
@@ -300,7 +300,7 @@ static int scale_length(int length, int offset, float scale) {
 	return round((offset + length) * scale) - round(offset * scale);
 }
 
-static void scale_box(struct wlr_box *box, float scale) {
+void scale_box(struct wlr_box *box, float scale) {
 	box->width = scale_length(box->width, box->x, scale);
 	box->height = scale_length(box->height, box->y, scale);
 	box->x = round(box->x * scale);
diff --git a/sway/desktop/render.c b/sway/desktop/render.c
index 6c9fe23c..a38c6a07 100644
--- a/sway/desktop/render.c
+++ b/sway/desktop/render.c
@@ -49,13 +49,6 @@ static int scale_length(int length, int offset, float scale) {
 	return round((offset + length) * scale) - round(offset * scale);
 }
 
-static void scale_box(struct wlr_box *box, float scale) {
-	box->width = scale_length(box->width, box->x, scale);
-	box->height = scale_length(box->height, box->y, scale);
-	box->x = round(box->x * scale);
-	box->y = round(box->y * scale);
-}
-
 static void scissor_output(struct wlr_output *wlr_output,
 		pixman_box32_t *rect) {
 	struct wlr_renderer *renderer = wlr_backend_get_renderer(wlr_output->backend);
@@ -164,7 +157,7 @@ static void render_drag_icons(struct sway_output *output,
 
 // _box.x and .y are expected to be layout-local
 // _box.width and .height are expected to be output-buffer-local
-static void render_rect(struct wlr_output *wlr_output,
+void render_rect(struct wlr_output *wlr_output,
 		pixman_region32_t *output_damage, const struct wlr_box *_box,
 		float color[static 4]) {
 	struct wlr_renderer *renderer =
@@ -197,7 +190,7 @@ damage_finish:
 	pixman_region32_fini(&damage);
 }
 
-static void premultiply_alpha(float color[4], float opacity) {
+void premultiply_alpha(float color[4], float opacity) {
 	color[3] *= opacity;
 	color[0] *= color[3];
 	color[1] *= color[3];
@@ -949,21 +942,11 @@ static void render_floating(struct sway_output *soutput,
 	}
 }
 
-static void render_dropzones(struct sway_output *output,
+static void render_seatops(struct sway_output *output,
 		pixman_region32_t *damage) {
 	struct sway_seat *seat;
 	wl_list_for_each(seat, &server.input->seats, link) {
-		if (seat->operation == OP_MOVE_TILING && seat->op_target_node
-				&& node_get_output(seat->op_target_node) == output) {
-			float color[4];
-			memcpy(&color, config->border_colors.focused.indicator,
-					sizeof(float) * 4);
-			premultiply_alpha(color, 0.5);
-			struct wlr_box box;
-			memcpy(&box, &seat->op_drop_box, sizeof(struct wlr_box));
-			scale_box(&box, output->wlr_output->scale);
-			render_rect(output->wlr_output, damage, &box, color);
-		}
+		seatop_render(seat, output, damage);
 	}
 }
 
@@ -1060,7 +1043,7 @@ void output_render(struct sway_output *output, struct timespec *when,
 			&output->layers[ZWLR_LAYER_SHELL_V1_LAYER_TOP]);
 	}
 
-	render_dropzones(output, damage);
+	render_seatops(output, damage);
 
 	struct sway_seat *seat = input_manager_current_seat();
 	struct sway_container *focus = seat_get_focused_container(seat);
diff --git a/sway/desktop/transaction.c b/sway/desktop/transaction.c
index f46938e2..1cdd7c6d 100644
--- a/sway/desktop/transaction.c
+++ b/sway/desktop/transaction.c
@@ -299,7 +299,7 @@ static void transaction_apply(struct sway_transaction *transaction) {
 	if (root->outputs->length) {
 		struct sway_seat *seat;
 		wl_list_for_each(seat, &server.input->seats, link) {
-			if (seat->operation == OP_NONE) {
+			if (!seat_doing_seatop(seat)) {
 				cursor_rebase(seat->cursor);
 			}
 		}
diff --git a/sway/desktop/xdg_shell.c b/sway/desktop/xdg_shell.c
index 801dcee0..f05e156f 100644
--- a/sway/desktop/xdg_shell.c
+++ b/sway/desktop/xdg_shell.c
@@ -360,7 +360,7 @@ static void handle_request_move(struct wl_listener *listener, void *data) {
 	struct wlr_xdg_toplevel_move_event *e = data;
 	struct sway_seat *seat = e->seat->seat->data;
 	if (e->serial == seat->last_button_serial) {
-		seat_begin_move_floating(seat, view->container, seat->last_button);
+		seatop_begin_move_floating(seat, view->container, seat->last_button);
 	}
 }
 
@@ -374,7 +374,7 @@ static void handle_request_resize(struct wl_listener *listener, void *data) {
 	struct wlr_xdg_toplevel_resize_event *e = data;
 	struct sway_seat *seat = e->seat->seat->data;
 	if (e->serial == seat->last_button_serial) {
-		seat_begin_resize_floating(seat, view->container,
+		seatop_begin_resize_floating(seat, view->container,
 				seat->last_button, e->edges);
 	}
 }
diff --git a/sway/desktop/xdg_shell_v6.c b/sway/desktop/xdg_shell_v6.c
index 4bc83b8e..9f6741c8 100644
--- a/sway/desktop/xdg_shell_v6.c
+++ b/sway/desktop/xdg_shell_v6.c
@@ -357,7 +357,7 @@ static void handle_request_move(struct wl_listener *listener, void *data) {
 	struct wlr_xdg_toplevel_v6_move_event *e = data;
 	struct sway_seat *seat = e->seat->seat->data;
 	if (e->serial == seat->last_button_serial) {
-		seat_begin_move_floating(seat, view->container, seat->last_button);
+		seatop_begin_move_floating(seat, view->container, seat->last_button);
 	}
 }
 
@@ -371,7 +371,7 @@ static void handle_request_resize(struct wl_listener *listener, void *data) {
 	struct wlr_xdg_toplevel_v6_resize_event *e = data;
 	struct sway_seat *seat = e->seat->seat->data;
 	if (e->serial == seat->last_button_serial) {
-		seat_begin_resize_floating(seat, view->container,
+		seatop_begin_resize_floating(seat, view->container,
 				seat->last_button, e->edges);
 	}
 }
diff --git a/sway/desktop/xwayland.c b/sway/desktop/xwayland.c
index 1838ad32..080f6c41 100644
--- a/sway/desktop/xwayland.c
+++ b/sway/desktop/xwayland.c
@@ -470,7 +470,7 @@ static void handle_request_move(struct wl_listener *listener, void *data) {
 		return;
 	}
 	struct sway_seat *seat = input_manager_current_seat();
-	seat_begin_move_floating(seat, view->container, seat->last_button);
+	seatop_begin_move_floating(seat, view->container, seat->last_button);
 }
 
 static void handle_request_resize(struct wl_listener *listener, void *data) {
@@ -486,7 +486,7 @@ static void handle_request_resize(struct wl_listener *listener, void *data) {
 	}
 	struct wlr_xwayland_resize_event *e = data;
 	struct sway_seat *seat = input_manager_current_seat();
-	seat_begin_resize_floating(seat, view->container,
+	seatop_begin_resize_floating(seat, view->container,
 			seat->last_button, e->edges);
 }
 
diff --git a/sway/input/cursor.c b/sway/input/cursor.c
index 9af7ef57..06294b8b 100644
--- a/sway/input/cursor.c
+++ b/sway/input/cursor.c
@@ -27,10 +27,6 @@
 #include "sway/tree/workspace.h"
 #include "wlr-layer-shell-unstable-v1-protocol.h"
 
-// When doing a tiling drag, this is the thickness of the dropzone
-// when dragging to the edge of a layout container.
-#define DROP_LAYOUT_BORDER 30
-
 static uint32_t get_current_time_msec(void) {
 	struct timespec now;
 	clock_gettime(CLOCK_MONOTONIC, &now);
@@ -59,7 +55,7 @@ static struct wlr_surface *layer_surface_at(struct sway_output *output,
  * Returns the node at the cursor's position. If there is a surface at that
  * location, it is stored in **surface (it may not be a view).
  */
-static struct sway_node *node_at_coords(
+struct sway_node *node_at_coords(
 		struct sway_seat *seat, double lx, double ly,
 		struct wlr_surface **surface, double *sx, double *sy) {
 	// check for unmanaged views first
@@ -226,347 +222,6 @@ static enum wlr_edges find_resize_edge(struct sway_container *cont,
 	return edge;
 }
 
-static void handle_down_motion(struct sway_seat *seat,
-		struct sway_cursor *cursor, uint32_t time_msec) {
-	struct sway_container *con = seat->op_container;
-	if (seat_is_input_allowed(seat, con->view->surface)) {
-		double moved_x = cursor->cursor->x - seat->op_ref_lx;
-		double moved_y = cursor->cursor->y - seat->op_ref_ly;
-		double sx = seat->op_ref_con_lx + moved_x;
-		double sy = seat->op_ref_con_ly + moved_y;
-		wlr_seat_pointer_notify_motion(seat->wlr_seat, time_msec, sx, sy);
-	}
-	seat->op_moved = true;
-}
-
-static void handle_move_floating_motion(struct sway_seat *seat,
-		struct sway_cursor *cursor) {
-	struct sway_container *con = seat->op_container;
-	desktop_damage_whole_container(con);
-	container_floating_translate(con,
-			cursor->cursor->x - cursor->previous.x,
-			cursor->cursor->y - cursor->previous.y);
-	desktop_damage_whole_container(con);
-}
-
-static void resize_box(struct wlr_box *box, enum wlr_edges edge,
-		int thickness) {
-	switch (edge) {
-	case WLR_EDGE_TOP:
-		box->height = thickness;
-		break;
-	case WLR_EDGE_LEFT:
-		box->width = thickness;
-		break;
-	case WLR_EDGE_RIGHT:
-		box->x = box->x + box->width - thickness;
-		box->width = thickness;
-		break;
-	case WLR_EDGE_BOTTOM:
-		box->y = box->y + box->height - thickness;
-		box->height = thickness;
-		break;
-	case WLR_EDGE_NONE:
-		box->x += thickness;
-		box->y += thickness;
-		box->width -= thickness * 2;
-		box->height -= thickness * 2;
-		break;
-	}
-}
-
-static void handle_move_tiling_motion(struct sway_seat *seat,
-		struct sway_cursor *cursor) {
-	struct wlr_surface *surface = NULL;
-	double sx, sy;
-	struct sway_node *node = node_at_coords(seat,
-			cursor->cursor->x, cursor->cursor->y, &surface, &sx, &sy);
-	// Damage the old location
-	desktop_damage_box(&seat->op_drop_box);
-
-	if (!node) {
-		// Eg. hovered over a layer surface such as swaybar
-		seat->op_target_node = NULL;
-		seat->op_target_edge = WLR_EDGE_NONE;
-		return;
-	}
-
-	if (node->type == N_WORKSPACE) {
-		// Emtpy workspace
-		seat->op_target_node = node;
-		seat->op_target_edge = WLR_EDGE_NONE;
-		workspace_get_box(node->sway_workspace, &seat->op_drop_box);
-		desktop_damage_box(&seat->op_drop_box);
-		return;
-	}
-
-	// Deny moving within own workspace if this is the only child
-	struct sway_container *con = node->sway_container;
-	if (workspace_num_tiling_views(seat->op_container->workspace) == 1 &&
-			con->workspace == seat->op_container->workspace) {
-		seat->op_target_node = NULL;
-		seat->op_target_edge = WLR_EDGE_NONE;
-		return;
-	}
-
-	// Traverse the ancestors, trying to find a layout container perpendicular
-	// to the edge. Eg. close to the top or bottom of a horiz layout.
-	while (con) {
-		enum wlr_edges edge = WLR_EDGE_NONE;
-		enum sway_container_layout layout = container_parent_layout(con);
-		struct wlr_box parent;
-		con->parent ? container_get_box(con->parent, &parent) :
-			workspace_get_box(con->workspace, &parent);
-		if (layout == L_HORIZ || layout == L_TABBED) {
-			if (cursor->cursor->y < parent.y + DROP_LAYOUT_BORDER) {
-				edge = WLR_EDGE_TOP;
-			} else if (cursor->cursor->y > parent.y + parent.height
-					- DROP_LAYOUT_BORDER) {
-				edge = WLR_EDGE_BOTTOM;
-			}
-		} else if (layout == L_VERT || layout == L_STACKED) {
-			if (cursor->cursor->x < parent.x + DROP_LAYOUT_BORDER) {
-				edge = WLR_EDGE_LEFT;
-			} else if (cursor->cursor->x > parent.x + parent.width
-					- DROP_LAYOUT_BORDER) {
-				edge = WLR_EDGE_RIGHT;
-			}
-		}
-		if (edge) {
-			seat->op_target_node = node_get_parent(&con->node);
-			seat->op_target_edge = edge;
-			node_get_box(seat->op_target_node, &seat->op_drop_box);
-			resize_box(&seat->op_drop_box, edge, DROP_LAYOUT_BORDER);
-			desktop_damage_box(&seat->op_drop_box);
-			return;
-		}
-		con = con->parent;
-	}
-
-	// Use the hovered view - but we must be over the actual surface
-	con = node->sway_container;
-	if (!con->view->surface || node == &seat->op_container->node) {
-		seat->op_target_node = NULL;
-		seat->op_target_edge = WLR_EDGE_NONE;
-		return;
-	}
-
-	// Find the closest edge
-	size_t thickness = fmin(con->content_width, con->content_height) * 0.3;
-	size_t closest_dist = INT_MAX;
-	size_t dist;
-	seat->op_target_edge = WLR_EDGE_NONE;
-	if ((dist = cursor->cursor->y - con->y) < closest_dist) {
-		closest_dist = dist;
-		seat->op_target_edge = WLR_EDGE_TOP;
-	}
-	if ((dist = cursor->cursor->x - con->x) < closest_dist) {
-		closest_dist = dist;
-		seat->op_target_edge = WLR_EDGE_LEFT;
-	}
-	if ((dist = con->x + con->width - cursor->cursor->x) < closest_dist) {
-		closest_dist = dist;
-		seat->op_target_edge = WLR_EDGE_RIGHT;
-	}
-	if ((dist = con->y + con->height - cursor->cursor->y) < closest_dist) {
-		closest_dist = dist;
-		seat->op_target_edge = WLR_EDGE_BOTTOM;
-	}
-
-	if (closest_dist > thickness) {
-		seat->op_target_edge = WLR_EDGE_NONE;
-	}
-
-	seat->op_target_node = node;
-	seat->op_drop_box.x = con->content_x;
-	seat->op_drop_box.y = con->content_y;
-	seat->op_drop_box.width = con->content_width;
-	seat->op_drop_box.height = con->content_height;
-	resize_box(&seat->op_drop_box, seat->op_target_edge, thickness);
-	desktop_damage_box(&seat->op_drop_box);
-}
-
-static void handle_move_tiling_threshold_motion(struct sway_seat *seat,
-		struct sway_cursor *cursor) {
-	double cx = seat->cursor->cursor->x;
-	double cy = seat->cursor->cursor->y;
-	double sx = seat->op_ref_lx;
-	double sy = seat->op_ref_ly;
-
-	// Get the scaled threshold for the output. Even if the operation goes
-	// across multiple outputs of varying scales, just use the scale for the
-	// output that the cursor is currently on for simplicity.
-	struct wlr_output *wlr_output = wlr_output_layout_output_at(
-			root->output_layout, cx, cy);
-	double output_scale = wlr_output ? wlr_output->scale : 1;
-	double threshold = config->tiling_drag_threshold * output_scale;
-	threshold *= threshold;
-
-	// If the threshold has been exceeded, start the actual drag
-	if ((cx - sx) * (cx - sx) + (cy - sy) * (cy - sy) > threshold) {
-		seat->operation = OP_MOVE_TILING;
-		cursor_set_image(cursor, "grab", NULL);
-		handle_move_tiling_motion(seat, cursor);
-	}
-}
-
-static void calculate_floating_constraints(struct sway_container *con,
-		int *min_width, int *max_width, int *min_height, int *max_height) {
-	if (config->floating_minimum_width == -1) { // no minimum
-		*min_width = 0;
-	} else if (config->floating_minimum_width == 0) { // automatic
-		*min_width = 75;
-	} else {
-		*min_width = config->floating_minimum_width;
-	}
-
-	if (config->floating_minimum_height == -1) { // no minimum
-		*min_height = 0;
-	} else if (config->floating_minimum_height == 0) { // automatic
-		*min_height = 50;
-	} else {
-		*min_height = config->floating_minimum_height;
-	}
-
-	if (config->floating_maximum_width == -1) { // no maximum
-		*max_width = INT_MAX;
-	} else if (config->floating_maximum_width == 0) { // automatic
-		*max_width = con->workspace->width;
-	} else {
-		*max_width = config->floating_maximum_width;
-	}
-
-	if (config->floating_maximum_height == -1) { // no maximum
-		*max_height = INT_MAX;
-	} else if (config->floating_maximum_height == 0) { // automatic
-		*max_height = con->workspace->height;
-	} else {
-		*max_height = config->floating_maximum_height;
-	}
-}
-
-static void handle_resize_floating_motion(struct sway_seat *seat,
-		struct sway_cursor *cursor) {
-	struct sway_container *con = seat->op_container;
-	enum wlr_edges edge = seat->op_resize_edge;
-
-	// The amount the mouse has moved since the start of the resize operation
-	// Positive is down/right
-	double mouse_move_x = cursor->cursor->x - seat->op_ref_lx;
-	double mouse_move_y = cursor->cursor->y - seat->op_ref_ly;
-
-	if (edge == WLR_EDGE_TOP || edge == WLR_EDGE_BOTTOM) {
-		mouse_move_x = 0;
-	}
-	if (edge == WLR_EDGE_LEFT || edge == WLR_EDGE_RIGHT) {
-		mouse_move_y = 0;
-	}
-
-	double grow_width = edge & WLR_EDGE_LEFT ? -mouse_move_x : mouse_move_x;
-	double grow_height = edge & WLR_EDGE_TOP ? -mouse_move_y : mouse_move_y;
-
-	if (seat->op_resize_preserve_ratio) {
-		double x_multiplier = grow_width / seat->op_ref_width;
-		double y_multiplier = grow_height / seat->op_ref_height;
-		double max_multiplier = fmax(x_multiplier, y_multiplier);
-		grow_width = seat->op_ref_width * max_multiplier;
-		grow_height = seat->op_ref_height * max_multiplier;
-	}
-
-	// Determine new width/height, and accommodate for floating min/max values
-	double width = seat->op_ref_width + grow_width;
-	double height = seat->op_ref_height + grow_height;
-	int min_width, max_width, min_height, max_height;
-	calculate_floating_constraints(con, &min_width, &max_width,
-			&min_height, &max_height);
-	width = fmax(min_width, fmin(width, max_width));
-	height = fmax(min_height, fmin(height, max_height));
-
-	// Apply the view's min/max size
-	if (con->view) {
-		double view_min_width, view_max_width, view_min_height, view_max_height;
-		view_get_constraints(con->view, &view_min_width, &view_max_width,
-				&view_min_height, &view_max_height);
-		width = fmax(view_min_width, fmin(width, view_max_width));
-		height = fmax(view_min_height, fmin(height, view_max_height));
-	}
-
-	// Recalculate these, in case we hit a min/max limit
-	grow_width = width - seat->op_ref_width;
-	grow_height = height - seat->op_ref_height;
-
-	// Determine grow x/y values - these are relative to the container's x/y at
-	// the start of the resize operation.
-	double grow_x = 0, grow_y = 0;
-	if (edge & WLR_EDGE_LEFT) {
-		grow_x = -grow_width;
-	} else if (edge & WLR_EDGE_RIGHT) {
-		grow_x = 0;
-	} else {
-		grow_x = -grow_width / 2;
-	}
-	if (edge & WLR_EDGE_TOP) {
-		grow_y = -grow_height;
-	} else if (edge & WLR_EDGE_BOTTOM) {
-		grow_y = 0;
-	} else {
-		grow_y = -grow_height / 2;
-	}
-
-	// Determine the amounts we need to bump everything relative to the current
-	// size.
-	int relative_grow_width = width - con->width;
-	int relative_grow_height = height - con->height;
-	int relative_grow_x = (seat->op_ref_con_lx + grow_x) - con->x;
-	int relative_grow_y = (seat->op_ref_con_ly + grow_y) - con->y;
-
-	// Actually resize stuff
-	con->x += relative_grow_x;
-	con->y += relative_grow_y;
-	con->width += relative_grow_width;
-	con->height += relative_grow_height;
-
-	con->content_x += relative_grow_x;
-	con->content_y += relative_grow_y;
-	con->content_width += relative_grow_width;
-	con->content_height += relative_grow_height;
-
-	arrange_container(con);
-}
-
-static void handle_resize_tiling_motion(struct sway_seat *seat,
-		struct sway_cursor *cursor) {
-	int amount_x = 0;
-	int amount_y = 0;
-	int moved_x = cursor->cursor->x - seat->op_ref_lx;
-	int moved_y = cursor->cursor->y - seat->op_ref_ly;
-	enum wlr_edges edge_x = WLR_EDGE_NONE;
-	enum wlr_edges edge_y = WLR_EDGE_NONE;
-	struct sway_container *con = seat->op_container;
-
-	if (seat->op_resize_edge & WLR_EDGE_TOP) {
-		amount_y = (seat->op_ref_height - moved_y) - con->height;
-		edge_y = WLR_EDGE_TOP;
-	} else if (seat->op_resize_edge & WLR_EDGE_BOTTOM) {
-		amount_y = (seat->op_ref_height + moved_y) - con->height;
-		edge_y = WLR_EDGE_BOTTOM;
-	}
-	if (seat->op_resize_edge & WLR_EDGE_LEFT) {
-		amount_x = (seat->op_ref_width - moved_x) - con->width;
-		edge_x = WLR_EDGE_LEFT;
-	} else if (seat->op_resize_edge & WLR_EDGE_RIGHT) {
-		amount_x = (seat->op_ref_width + moved_x) - con->width;
-		edge_x = WLR_EDGE_RIGHT;
-	}
-
-	if (amount_x != 0) {
-		container_resize_tiled(seat->op_container, edge_x, amount_x);
-	}
-	if (amount_y != 0) {
-		container_resize_tiled(seat->op_container, edge_y, amount_y);
-	}
-}
-
 static void cursor_do_rebase(struct sway_cursor *cursor, uint32_t time_msec,
 		struct sway_node *node, struct wlr_surface *surface,
 		double sx, double sy) {
@@ -669,29 +324,8 @@ void cursor_send_pointer_motion(struct sway_cursor *cursor,
 	struct sway_seat *seat = cursor->seat;
 	struct wlr_seat *wlr_seat = seat->wlr_seat;
 
-	if (seat->operation != OP_NONE) {
-		switch (seat->operation) {
-		case OP_DOWN:
-			handle_down_motion(seat, cursor, time_msec);
-			break;
-		case OP_MOVE_FLOATING:
-			handle_move_floating_motion(seat, cursor);
-			break;
-		case OP_MOVE_TILING_THRESHOLD:
-			handle_move_tiling_threshold_motion(seat, cursor);
-			break;
-		case OP_MOVE_TILING:
-			handle_move_tiling_motion(seat, cursor);
-			break;
-		case OP_RESIZE_FLOATING:
-			handle_resize_floating_motion(seat, cursor);
-			break;
-		case OP_RESIZE_TILING:
-			handle_resize_tiling_motion(seat, cursor);
-			break;
-		case OP_NONE:
-			break;
-		}
+	if (seat_doing_seatop(seat)) {
+		seatop_motion(seat, time_msec);
 		cursor->previous.x = cursor->cursor->x;
 		cursor->previous.y = cursor->cursor->y;
 		return;
@@ -868,9 +502,9 @@ void dispatch_cursor_button(struct sway_cursor *cursor,
 	struct sway_seat *seat = cursor->seat;
 
 	// Handle existing seat operation
-	if (cursor->seat->operation != OP_NONE) {
-		if (button == cursor->seat->op_button && state == WLR_BUTTON_RELEASED) {
-			seat_end_mouse_operation(seat);
+	if (seat_doing_seatop(seat)) {
+		if (button == seat->seatop_button && state == WLR_BUTTON_RELEASED) {
+			seatop_finish(seat);
 			seat_pointer_notify_button(seat, time_msec, button, state);
 		}
 		if (state == WLR_BUTTON_PRESSED) {
@@ -943,7 +577,7 @@ void dispatch_cursor_button(struct sway_cursor *cursor,
 	if (cont && resize_edge && button == BTN_LEFT &&
 			state == WLR_BUTTON_PRESSED && !is_floating) {
 		seat_set_focus_container(seat, cont);
-		seat_begin_resize_tiling(seat, cont, button, edge);
+		seatop_begin_resize_tiling(seat, cont, button, edge);
 		return;
 	}
 
@@ -973,7 +607,7 @@ void dispatch_cursor_button(struct sway_cursor *cursor,
 			}
 			cursor_set_image(seat->cursor, image, NULL);
 			seat_set_focus_container(seat, cont);
-			seat_begin_resize_tiling(seat, cont, button, edge);
+			seatop_begin_resize_tiling(seat, cont, button, edge);
 			return;
 		}
 	}
@@ -988,7 +622,7 @@ void dispatch_cursor_button(struct sway_cursor *cursor,
 				cont = cont->parent;
 			}
 			seat_set_focus_container(seat, cont);
-			seat_begin_move_floating(seat, cont, button);
+			seatop_begin_move_floating(seat, cont, button);
 			return;
 		}
 	}
@@ -998,7 +632,7 @@ void dispatch_cursor_button(struct sway_cursor *cursor,
 			state == WLR_BUTTON_PRESSED) {
 		// Via border
 		if (button == BTN_LEFT && resize_edge != WLR_EDGE_NONE) {
-			seat_begin_resize_floating(seat, cont, button, resize_edge);
+			seatop_begin_resize_floating(seat, cont, button, resize_edge);
 			return;
 		}
 
@@ -1015,7 +649,7 @@ void dispatch_cursor_button(struct sway_cursor *cursor,
 				WLR_EDGE_RIGHT : WLR_EDGE_LEFT;
 			edge |= cursor->cursor->y > floater->y + floater->height / 2 ?
 				WLR_EDGE_BOTTOM : WLR_EDGE_TOP;
-			seat_begin_resize_floating(seat, floater, button, edge);
+			seatop_begin_resize_floating(seat, floater, button, edge);
 			return;
 		}
 	}
@@ -1035,9 +669,9 @@ void dispatch_cursor_button(struct sway_cursor *cursor,
 
 		// If moving a container by it's title bar, use a threshold for the drag
 		if (!mod_pressed && config->tiling_drag_threshold > 0) {
-			seat_begin_move_tiling_threshold(seat, cont, button);
+			seatop_begin_move_tiling_threshold(seat, cont, button);
 		} else {
-			seat_begin_move_tiling(seat, cont, button);
+			seatop_begin_move_tiling(seat, cont, button);
 		}
 		return;
 	}
@@ -1046,7 +680,7 @@ void dispatch_cursor_button(struct sway_cursor *cursor,
 	if (surface && cont && state == WLR_BUTTON_PRESSED) {
 		seat_set_focus_container(seat, cont);
 		seat_pointer_notify_button(seat, time_msec, button, state);
-		seat_begin_down(seat, cont, button, sx, sy);
+		seatop_begin_down(seat, cont, button, sx, sy);
 		return;
 	}
 
@@ -1350,7 +984,7 @@ static void handle_request_set_cursor(struct wl_listener *listener,
 		void *data) {
 	struct sway_cursor *cursor =
 		wl_container_of(listener, cursor, request_set_cursor);
-	if (cursor->seat->operation != OP_NONE) {
+	if (seat_doing_seatop(cursor->seat)) {
 		return;
 	}
 	struct wlr_seat_pointer_request_set_cursor_event *event = data;
diff --git a/sway/input/seat.c b/sway/input/seat.c
index a8df5b99..7bd889d7 100644
--- a/sway/input/seat.c
+++ b/sway/input/seat.c
@@ -308,7 +308,7 @@ static void handle_new_drag_icon(struct wl_listener *listener, void *data) {
 	wl_list_insert(&root->drag_icons, &icon->link);
 
 	drag_icon_update_position(icon);
-	seat_end_mouse_operation(seat);
+	seatop_abort(seat);
 }
 
 static void collect_focus_iter(struct sway_node *node, void *data) {
@@ -625,18 +625,6 @@ static int handle_urgent_timeout(void *data) {
 	return 0;
 }
 
-static 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);
-	}
-}
-
 static void set_workspace(struct sway_seat *seat,
 		struct sway_workspace *new_ws) {
 	if (seat->workspace == new_ws) {
@@ -1025,187 +1013,6 @@ struct seat_config *seat_get_config_by_name(const char *name) {
 	return NULL;
 }
 
-void seat_begin_down(struct sway_seat *seat, struct sway_container *con,
-		uint32_t button, double sx, double sy) {
-	seat->operation = OP_DOWN;
-	seat->op_container = con;
-	seat->op_button = button;
-	seat->op_ref_lx = seat->cursor->cursor->x;
-	seat->op_ref_ly = seat->cursor->cursor->y;
-	seat->op_ref_con_lx = sx;
-	seat->op_ref_con_ly = sy;
-	seat->op_moved = false;
-
-	container_raise_floating(con);
-}
-
-void seat_begin_move_floating(struct sway_seat *seat,
-		struct sway_container *con, uint32_t button) {
-	if (!seat->cursor) {
-		wlr_log(WLR_DEBUG, "Ignoring move request due to no cursor device");
-		return;
-	}
-	seat->operation = OP_MOVE_FLOATING;
-	seat->op_container = con;
-	seat->op_button = button;
-
-	container_raise_floating(con);
-
-	cursor_set_image(seat->cursor, "grab", NULL);
-}
-
-void seat_begin_move_tiling_threshold(struct sway_seat *seat,
-		struct sway_container *con, uint32_t button) {
-	seat->operation = OP_MOVE_TILING_THRESHOLD;
-	seat->op_container = con;
-	seat->op_button = button;
-	seat->op_target_node = NULL;
-	seat->op_target_edge = 0;
-	seat->op_ref_lx = seat->cursor->cursor->x;
-	seat->op_ref_ly = seat->cursor->cursor->y;
-}
-
-void seat_begin_move_tiling(struct sway_seat *seat,
-		struct sway_container *con, uint32_t button) {
-	seat->operation = OP_MOVE_TILING;
-	seat->op_container = con;
-	seat->op_button = button;
-	seat->op_target_node = NULL;
-	seat->op_target_edge = 0;
-	cursor_set_image(seat->cursor, "grab", NULL);
-}
-
-void seat_begin_resize_floating(struct sway_seat *seat,
-		struct sway_container *con, uint32_t button, enum wlr_edges edge) {
-	if (!seat->cursor) {
-		wlr_log(WLR_DEBUG, "Ignoring resize request due to no cursor device");
-		return;
-	}
-	struct wlr_keyboard *keyboard = wlr_seat_get_keyboard(seat->wlr_seat);
-	seat->operation = OP_RESIZE_FLOATING;
-	seat->op_container = con;
-	seat->op_resize_preserve_ratio = keyboard &&
-		(wlr_keyboard_get_modifiers(keyboard) & WLR_MODIFIER_SHIFT);
-	seat->op_resize_edge = edge == WLR_EDGE_NONE ?
-		WLR_EDGE_BOTTOM | WLR_EDGE_RIGHT : edge;
-	seat->op_button = button;
-	seat->op_ref_lx = seat->cursor->cursor->x;
-	seat->op_ref_ly = seat->cursor->cursor->y;
-	seat->op_ref_con_lx = con->x;
-	seat->op_ref_con_ly = con->y;
-	seat->op_ref_width = con->width;
-	seat->op_ref_height = con->height;
-
-	container_raise_floating(con);
-
-	const char *image = edge == WLR_EDGE_NONE ?
-		"se-resize" : wlr_xcursor_get_resize_name(edge);
-	cursor_set_image(seat->cursor, image, NULL);
-}
-
-void seat_begin_resize_tiling(struct sway_seat *seat,
-		struct sway_container *con, uint32_t button, enum wlr_edges edge) {
-	seat->operation = OP_RESIZE_TILING;
-	seat->op_container = con;
-	seat->op_resize_edge = edge;
-	seat->op_button = button;
-	seat->op_ref_lx = seat->cursor->cursor->x;
-	seat->op_ref_ly = seat->cursor->cursor->y;
-	seat->op_ref_con_lx = con->x;
-	seat->op_ref_con_ly = con->y;
-	seat->op_ref_width = con->width;
-	seat->op_ref_height = con->height;
-}
-
-static bool is_parallel(enum sway_container_layout layout,
-		enum wlr_edges edge) {
-	bool layout_is_horiz = layout == L_HORIZ || layout == L_TABBED;
-	bool edge_is_horiz = edge == WLR_EDGE_LEFT || edge == WLR_EDGE_RIGHT;
-	return layout_is_horiz == edge_is_horiz;
-}
-
-static void seat_end_move_tiling(struct sway_seat *seat) {
-	struct sway_container *con = seat->op_container;
-	struct sway_container *old_parent = con->parent;
-	struct sway_workspace *old_ws = con->workspace;
-	struct sway_node *target_node = seat->op_target_node;
-	struct sway_workspace *new_ws = target_node->type == N_WORKSPACE ?
-		target_node->sway_workspace : target_node->sway_container->workspace;
-	enum wlr_edges edge = seat->op_target_edge;
-	int after = edge != WLR_EDGE_TOP && edge != WLR_EDGE_LEFT;
-
-	container_detach(con);
-
-	// Moving container into empty workspace
-	if (target_node->type == N_WORKSPACE && edge == WLR_EDGE_NONE) {
-		workspace_add_tiling(new_ws, con);
-	} else if (target_node->type == N_CONTAINER) {
-		// Moving container before/after another
-		struct sway_container *target = target_node->sway_container;
-		enum sway_container_layout layout = container_parent_layout(target);
-		if (edge && !is_parallel(layout, edge)) {
-			enum sway_container_layout new_layout = edge == WLR_EDGE_TOP ||
-				edge == WLR_EDGE_BOTTOM ? L_VERT : L_HORIZ;
-			container_split(target, new_layout);
-		}
-		container_add_sibling(target, con, after);
-	} else {
-		// Target is a workspace which requires splitting
-		enum sway_container_layout new_layout = edge == WLR_EDGE_TOP ||
-			edge == WLR_EDGE_BOTTOM ? L_VERT : L_HORIZ;
-		workspace_split(new_ws, new_layout);
-		workspace_insert_tiling(new_ws, con, after);
-	}
-
-	if (old_parent) {
-		container_reap_empty(old_parent);
-	}
-
-	// This is a bit dirty, but we'll set the dimensions to that of a sibling.
-	// I don't think there's any other way to make it consistent without
-	// changing how we auto-size containers.
-	list_t *siblings = container_get_siblings(con);
-	if (siblings->length > 1) {
-		int index = list_find(siblings, con);
-		struct sway_container *sibling = index == 0 ?
-			siblings->items[1] : siblings->items[index - 1];
-		con->width = sibling->width;
-		con->height = sibling->height;
-	}
-
-	arrange_workspace(old_ws);
-	if (new_ws != old_ws) {
-		arrange_workspace(new_ws);
-	}
-}
-
-void seat_end_mouse_operation(struct sway_seat *seat) {
-	enum sway_seat_operation operation = seat->operation;
-	if (seat->operation == OP_MOVE_FLOATING) {
-		// We "move" the container to its own location so it discovers its
-		// output again.
-		struct sway_container *con = seat->op_container;
-		container_floating_move_to(con, con->x, con->y);
-	} else if (seat->operation == OP_MOVE_TILING && seat->op_target_node) {
-		seat_end_move_tiling(seat);
-	}
-	seat->operation = OP_NONE;
-	seat->op_container = NULL;
-	if (operation == OP_DOWN) {
-		// 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 = seat->op_ref_lx;
-		seat->cursor->previous.y = seat->op_ref_ly;
-		if (seat->op_moved) {
-			cursor_send_pointer_motion(seat->cursor, 0);
-		}
-	} else {
-		cursor_set_image(seat->cursor, "left_ptr", NULL);
-	}
-}
-
 void seat_pointer_notify_button(struct sway_seat *seat, uint32_t time_msec,
 		uint32_t button, enum wlr_button_state state) {
 	seat->last_button = button;
@@ -1238,3 +1045,44 @@ void seat_consider_warp_to_focus(struct sway_seat *seat) {
 		wl_event_source_timer_update(seat->cursor->hide_source, cursor_get_timeout(seat->cursor));
 	}
 }
+
+bool seat_doing_seatop(struct sway_seat *seat) {
+	return seat->seatop_impl != NULL;
+}
+
+void seatop_unref(struct sway_seat *seat, struct sway_container *con) {
+	if (seat->seatop_impl && seat->seatop_impl->unref) {
+		seat->seatop_impl->unref(seat, con);
+	}
+}
+
+void seatop_motion(struct sway_seat *seat, uint32_t time_msec) {
+	if (seat->seatop_impl && seat->seatop_impl->motion) {
+		seat->seatop_impl->motion(seat, time_msec);
+	}
+}
+
+void seatop_finish(struct sway_seat *seat) {
+	if (seat->seatop_impl && seat->seatop_impl->finish) {
+		seat->seatop_impl->finish(seat);
+	}
+	free(seat->seatop_data);
+	seat->seatop_data = NULL;
+	seat->seatop_impl = NULL;
+}
+
+void seatop_abort(struct sway_seat *seat) {
+	if (seat->seatop_impl && seat->seatop_impl->abort) {
+		seat->seatop_impl->abort(seat);
+	}
+	free(seat->seatop_data);
+	seat->seatop_data = NULL;
+	seat->seatop_impl = NULL;
+}
+
+void seatop_render(struct sway_seat *seat, struct sway_output *output,
+		pixman_region32_t *damage) {
+	if (seat->seatop_impl && seat->seatop_impl->render) {
+		seat->seatop_impl->render(seat, output, damage);
+	}
+}
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;
+}
diff --git a/sway/input/seatop_move_floating.c b/sway/input/seatop_move_floating.c
new file mode 100644
index 00000000..08e3a5a4
--- /dev/null
+++ b/sway/input/seatop_move_floating.c
@@ -0,0 +1,65 @@
+#define _POSIX_C_SOURCE 200809L
+#include <wlr/types/wlr_cursor.h>
+#include "sway/desktop.h"
+#include "sway/input/cursor.h"
+#include "sway/input/seat.h"
+
+struct seatop_move_floating_event {
+	struct sway_container *con;
+};
+
+static void handle_motion(struct sway_seat *seat, uint32_t time_msec) {
+	struct seatop_move_floating_event *e = seat->seatop_data;
+	desktop_damage_whole_container(e->con);
+	container_floating_translate(e->con,
+			seat->cursor->cursor->x - seat->cursor->previous.x,
+			seat->cursor->cursor->y - seat->cursor->previous.y);
+	desktop_damage_whole_container(e->con);
+}
+
+static void handle_finish(struct sway_seat *seat) {
+	struct seatop_move_floating_event *e = seat->seatop_data;
+
+	// We "move" the container to its own location
+	// so it discovers its output again.
+	container_floating_move_to(e->con, e->con->x, e->con->y);
+	cursor_set_image(seat->cursor, "left_ptr", NULL);
+}
+
+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_move_floating_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_move_floating(struct sway_seat *seat,
+		struct sway_container *con, uint32_t button) {
+	seatop_abort(seat);
+
+	struct seatop_move_floating_event *e =
+		calloc(1, sizeof(struct seatop_move_floating_event));
+	if (!e) {
+		return;
+	}
+	e->con = con;
+
+	seat->seatop_impl = &seatop_impl;
+	seat->seatop_data = e;
+	seat->seatop_button = button;
+
+	container_raise_floating(con);
+
+	cursor_set_image(seat->cursor, "grab", NULL);
+}
diff --git a/sway/input/seatop_move_tiling.c b/sway/input/seatop_move_tiling.c
new file mode 100644
index 00000000..8b541f80
--- /dev/null
+++ b/sway/input/seatop_move_tiling.c
@@ -0,0 +1,335 @@
+#define _POSIX_C_SOURCE 200809L
+#include <limits.h>
+#include <wlr/types/wlr_cursor.h>
+#include <wlr/util/edges.h>
+#include "sway/desktop.h"
+#include "sway/input/cursor.h"
+#include "sway/input/seat.h"
+#include "sway/output.h"
+#include "sway/tree/arrange.h"
+#include "sway/tree/node.h"
+#include "sway/tree/view.h"
+#include "sway/tree/workspace.h"
+
+// Thickness of the dropzone when dragging to the edge of a layout container
+#define DROP_LAYOUT_BORDER 30
+
+struct seatop_move_tiling_event {
+	struct sway_container *con;
+	struct sway_node *target_node;
+	enum wlr_edges target_edge;
+	struct wlr_box drop_box;
+	double ref_lx, ref_ly; // cursor's x/y at start of op
+	bool threshold_reached;
+};
+
+static void handle_render(struct sway_seat *seat,
+		struct sway_output *output, pixman_region32_t *damage) {
+	struct seatop_move_tiling_event *e = seat->seatop_data;
+	if (!e->threshold_reached) {
+		return;
+	}
+	if (e->target_node && node_get_output(e->target_node) == output) {
+		float color[4];
+		memcpy(&color, config->border_colors.focused.indicator,
+				sizeof(float) * 4);
+		premultiply_alpha(color, 0.5);
+		struct wlr_box box;
+		memcpy(&box, &e->drop_box, sizeof(struct wlr_box));
+		scale_box(&box, output->wlr_output->scale);
+		render_rect(output->wlr_output, damage, &box, color);
+	}
+}
+
+static void handle_motion_prethreshold(struct sway_seat *seat) {
+	struct seatop_move_tiling_event *e = seat->seatop_data;
+	double cx = seat->cursor->cursor->x;
+	double cy = seat->cursor->cursor->y;
+	double sx = e->ref_lx;
+	double sy = e->ref_ly;
+
+	// Get the scaled threshold for the output. Even if the operation goes
+	// across multiple outputs of varying scales, just use the scale for the
+	// output that the cursor is currently on for simplicity.
+	struct wlr_output *wlr_output = wlr_output_layout_output_at(
+			root->output_layout, cx, cy);
+	double output_scale = wlr_output ? wlr_output->scale : 1;
+	double threshold = config->tiling_drag_threshold * output_scale;
+	threshold *= threshold;
+
+	// If the threshold has been exceeded, start the actual drag
+	if ((cx - sx) * (cx - sx) + (cy - sy) * (cy - sy) > threshold) {
+		e->threshold_reached = true;
+		cursor_set_image(seat->cursor, "grab", NULL);
+	}
+}
+
+static void resize_box(struct wlr_box *box, enum wlr_edges edge,
+		int thickness) {
+	switch (edge) {
+	case WLR_EDGE_TOP:
+		box->height = thickness;
+		break;
+	case WLR_EDGE_LEFT:
+		box->width = thickness;
+		break;
+	case WLR_EDGE_RIGHT:
+		box->x = box->x + box->width - thickness;
+		box->width = thickness;
+		break;
+	case WLR_EDGE_BOTTOM:
+		box->y = box->y + box->height - thickness;
+		box->height = thickness;
+		break;
+	case WLR_EDGE_NONE:
+		box->x += thickness;
+		box->y += thickness;
+		box->width -= thickness * 2;
+		box->height -= thickness * 2;
+		break;
+	}
+}
+
+static void handle_motion_postthreshold(struct sway_seat *seat) {
+	struct seatop_move_tiling_event *e = seat->seatop_data;
+	struct wlr_surface *surface = NULL;
+	double sx, sy;
+	struct sway_cursor *cursor = seat->cursor;
+	struct sway_node *node = node_at_coords(seat,
+			cursor->cursor->x, cursor->cursor->y, &surface, &sx, &sy);
+	// Damage the old location
+	desktop_damage_box(&e->drop_box);
+
+	if (!node) {
+		// Eg. hovered over a layer surface such as swaybar
+		e->target_node = NULL;
+		e->target_edge = WLR_EDGE_NONE;
+		return;
+	}
+
+	if (node->type == N_WORKSPACE) {
+		// Emtpy workspace
+		e->target_node = node;
+		e->target_edge = WLR_EDGE_NONE;
+		workspace_get_box(node->sway_workspace, &e->drop_box);
+		desktop_damage_box(&e->drop_box);
+		return;
+	}
+
+	// Deny moving within own workspace if this is the only child
+	struct sway_container *con = node->sway_container;
+	if (workspace_num_tiling_views(e->con->workspace) == 1 &&
+			con->workspace == e->con->workspace) {
+		e->target_node = NULL;
+		e->target_edge = WLR_EDGE_NONE;
+		return;
+	}
+
+	// Traverse the ancestors, trying to find a layout container perpendicular
+	// to the edge. Eg. close to the top or bottom of a horiz layout.
+	while (con) {
+		enum wlr_edges edge = WLR_EDGE_NONE;
+		enum sway_container_layout layout = container_parent_layout(con);
+		struct wlr_box parent;
+		con->parent ? container_get_box(con->parent, &parent) :
+			workspace_get_box(con->workspace, &parent);
+		if (layout == L_HORIZ || layout == L_TABBED) {
+			if (cursor->cursor->y < parent.y + DROP_LAYOUT_BORDER) {
+				edge = WLR_EDGE_TOP;
+			} else if (cursor->cursor->y > parent.y + parent.height
+					- DROP_LAYOUT_BORDER) {
+				edge = WLR_EDGE_BOTTOM;
+			}
+		} else if (layout == L_VERT || layout == L_STACKED) {
+			if (cursor->cursor->x < parent.x + DROP_LAYOUT_BORDER) {
+				edge = WLR_EDGE_LEFT;
+			} else if (cursor->cursor->x > parent.x + parent.width
+					- DROP_LAYOUT_BORDER) {
+				edge = WLR_EDGE_RIGHT;
+			}
+		}
+		if (edge) {
+			e->target_node = node_get_parent(&con->node);
+			e->target_edge = edge;
+			node_get_box(e->target_node, &e->drop_box);
+			resize_box(&e->drop_box, edge, DROP_LAYOUT_BORDER);
+			desktop_damage_box(&e->drop_box);
+			return;
+		}
+		con = con->parent;
+	}
+
+	// Use the hovered view - but we must be over the actual surface
+	con = node->sway_container;
+	if (!con->view->surface || node == &e->con->node) {
+		e->target_node = NULL;
+		e->target_edge = WLR_EDGE_NONE;
+		return;
+	}
+
+	// Find the closest edge
+	size_t thickness = fmin(con->content_width, con->content_height) * 0.3;
+	size_t closest_dist = INT_MAX;
+	size_t dist;
+	e->target_edge = WLR_EDGE_NONE;
+	if ((dist = cursor->cursor->y - con->y) < closest_dist) {
+		closest_dist = dist;
+		e->target_edge = WLR_EDGE_TOP;
+	}
+	if ((dist = cursor->cursor->x - con->x) < closest_dist) {
+		closest_dist = dist;
+		e->target_edge = WLR_EDGE_LEFT;
+	}
+	if ((dist = con->x + con->width - cursor->cursor->x) < closest_dist) {
+		closest_dist = dist;
+		e->target_edge = WLR_EDGE_RIGHT;
+	}
+	if ((dist = con->y + con->height - cursor->cursor->y) < closest_dist) {
+		closest_dist = dist;
+		e->target_edge = WLR_EDGE_BOTTOM;
+	}
+
+	if (closest_dist > thickness) {
+		e->target_edge = WLR_EDGE_NONE;
+	}
+
+	e->target_node = node;
+	e->drop_box.x = con->content_x;
+	e->drop_box.y = con->content_y;
+	e->drop_box.width = con->content_width;
+	e->drop_box.height = con->content_height;
+	resize_box(&e->drop_box, e->target_edge, thickness);
+	desktop_damage_box(&e->drop_box);
+}
+
+static void handle_motion(struct sway_seat *seat, uint32_t time_msec) {
+	struct seatop_move_tiling_event *e = seat->seatop_data;
+	if (e->threshold_reached) {
+		handle_motion_postthreshold(seat);
+	} else {
+		handle_motion_prethreshold(seat);
+	}
+}
+
+static void handle_abort(struct sway_seat *seat) {
+	cursor_set_image(seat->cursor, "left_ptr", NULL);
+}
+
+static bool is_parallel(enum sway_container_layout layout,
+		enum wlr_edges edge) {
+	bool layout_is_horiz = layout == L_HORIZ || layout == L_TABBED;
+	bool edge_is_horiz = edge == WLR_EDGE_LEFT || edge == WLR_EDGE_RIGHT;
+	return layout_is_horiz == edge_is_horiz;
+}
+
+static void handle_finish(struct sway_seat *seat) {
+	struct seatop_move_tiling_event *e = seat->seatop_data;
+
+	if (!e->target_node) {
+		handle_abort(seat);
+		return;
+	}
+
+	struct sway_container *con = e->con;
+	struct sway_container *old_parent = con->parent;
+	struct sway_workspace *old_ws = con->workspace;
+	struct sway_node *target_node = e->target_node;
+	struct sway_workspace *new_ws = target_node->type == N_WORKSPACE ?
+		target_node->sway_workspace : target_node->sway_container->workspace;
+	enum wlr_edges edge = e->target_edge;
+	int after = edge != WLR_EDGE_TOP && edge != WLR_EDGE_LEFT;
+
+	container_detach(con);
+
+	// Moving container into empty workspace
+	if (target_node->type == N_WORKSPACE && edge == WLR_EDGE_NONE) {
+		workspace_add_tiling(new_ws, con);
+	} else if (target_node->type == N_CONTAINER) {
+		// Moving container before/after another
+		struct sway_container *target = target_node->sway_container;
+		enum sway_container_layout layout = container_parent_layout(target);
+		if (edge && !is_parallel(layout, edge)) {
+			enum sway_container_layout new_layout = edge == WLR_EDGE_TOP ||
+				edge == WLR_EDGE_BOTTOM ? L_VERT : L_HORIZ;
+			container_split(target, new_layout);
+		}
+		container_add_sibling(target, con, after);
+	} else {
+		// Target is a workspace which requires splitting
+		enum sway_container_layout new_layout = edge == WLR_EDGE_TOP ||
+			edge == WLR_EDGE_BOTTOM ? L_VERT : L_HORIZ;
+		workspace_split(new_ws, new_layout);
+		workspace_insert_tiling(new_ws, con, after);
+	}
+
+	if (old_parent) {
+		container_reap_empty(old_parent);
+	}
+
+	// This is a bit dirty, but we'll set the dimensions to that of a sibling.
+	// I don't think there's any other way to make it consistent without
+	// changing how we auto-size containers.
+	list_t *siblings = container_get_siblings(con);
+	if (siblings->length > 1) {
+		int index = list_find(siblings, con);
+		struct sway_container *sibling = index == 0 ?
+			siblings->items[1] : siblings->items[index - 1];
+		con->width = sibling->width;
+		con->height = sibling->height;
+	}
+
+	arrange_workspace(old_ws);
+	if (new_ws != old_ws) {
+		arrange_workspace(new_ws);
+	}
+
+	cursor_set_image(seat->cursor, "left_ptr", NULL);
+}
+
+static void handle_unref(struct sway_seat *seat, struct sway_container *con) {
+	struct seatop_move_tiling_event *e = seat->seatop_data;
+	if (e->target_node == &con->node) { // Drop target
+		e->target_node = NULL;
+	}
+	if (e->con == con) { // The container being moved
+		seatop_abort(seat);
+	}
+}
+
+static const struct sway_seatop_impl seatop_impl = {
+	.motion = handle_motion,
+	.finish = handle_finish,
+	.abort = handle_abort,
+	.unref = handle_unref,
+	.render = handle_render,
+};
+
+void seatop_begin_move_tiling_threshold(struct sway_seat *seat,
+		struct sway_container *con, uint32_t button) {
+	seatop_abort(seat);
+
+	struct seatop_move_tiling_event *e =
+		calloc(1, sizeof(struct seatop_move_tiling_event));
+	if (!e) {
+		return;
+	}
+	e->con = con;
+	e->ref_lx = seat->cursor->cursor->x;
+	e->ref_ly = seat->cursor->cursor->y;
+
+	seat->seatop_impl = &seatop_impl;
+	seat->seatop_data = e;
+	seat->seatop_button = button;
+
+	container_raise_floating(con);
+}
+
+void seatop_begin_move_tiling(struct sway_seat *seat,
+		struct sway_container *con, uint32_t button) {
+	seatop_begin_move_tiling_threshold(seat, con, button);
+	struct seatop_move_tiling_event *e = seat->seatop_data;
+	if (e) {
+		e->threshold_reached = true;
+		cursor_set_image(seat->cursor, "grab", NULL);
+	}
+}
diff --git a/sway/input/seatop_resize_floating.c b/sway/input/seatop_resize_floating.c
new file mode 100644
index 00000000..12851b40
--- /dev/null
+++ b/sway/input/seatop_resize_floating.c
@@ -0,0 +1,199 @@
+#define _POSIX_C_SOURCE 200809L
+#include <limits.h>
+#include <wlr/types/wlr_cursor.h>
+#include <wlr/types/wlr_xcursor_manager.h>
+#include "sway/input/cursor.h"
+#include "sway/input/seat.h"
+#include "sway/tree/arrange.h"
+#include "sway/tree/view.h"
+#include "sway/tree/workspace.h"
+
+struct seatop_resize_floating_event {
+	struct sway_container *con;
+	enum wlr_edges edge;
+	bool preserve_ratio;
+	double ref_lx, ref_ly;         // cursor's x/y at start of op
+	double ref_width, ref_height;  // container's size at start of op
+	double ref_con_lx, ref_con_ly; // container's x/y at start of op
+};
+
+static void calculate_floating_constraints(struct sway_container *con,
+		int *min_width, int *max_width, int *min_height, int *max_height) {
+	if (config->floating_minimum_width == -1) { // no minimum
+		*min_width = 0;
+	} else if (config->floating_minimum_width == 0) { // automatic
+		*min_width = 75;
+	} else {
+		*min_width = config->floating_minimum_width;
+	}
+
+	if (config->floating_minimum_height == -1) { // no minimum
+		*min_height = 0;
+	} else if (config->floating_minimum_height == 0) { // automatic
+		*min_height = 50;
+	} else {
+		*min_height = config->floating_minimum_height;
+	}
+
+	if (config->floating_maximum_width == -1) { // no maximum
+		*max_width = INT_MAX;
+	} else if (config->floating_maximum_width == 0) { // automatic
+		*max_width = con->workspace->width;
+	} else {
+		*max_width = config->floating_maximum_width;
+	}
+
+	if (config->floating_maximum_height == -1) { // no maximum
+		*max_height = INT_MAX;
+	} else if (config->floating_maximum_height == 0) { // automatic
+		*max_height = con->workspace->height;
+	} else {
+		*max_height = config->floating_maximum_height;
+	}
+}
+
+static void handle_motion(struct sway_seat *seat, uint32_t time_msec) {
+	struct seatop_resize_floating_event *e = seat->seatop_data;
+	struct sway_container *con = e->con;
+	enum wlr_edges edge = e->edge;
+	struct sway_cursor *cursor = seat->cursor;
+
+	// The amount the mouse has moved since the start of the resize operation
+	// Positive is down/right
+	double mouse_move_x = cursor->cursor->x - e->ref_lx;
+	double mouse_move_y = cursor->cursor->y - e->ref_ly;
+
+	if (edge == WLR_EDGE_TOP || edge == WLR_EDGE_BOTTOM) {
+		mouse_move_x = 0;
+	}
+	if (edge == WLR_EDGE_LEFT || edge == WLR_EDGE_RIGHT) {
+		mouse_move_y = 0;
+	}
+
+	double grow_width = edge & WLR_EDGE_LEFT ? -mouse_move_x : mouse_move_x;
+	double grow_height = edge & WLR_EDGE_TOP ? -mouse_move_y : mouse_move_y;
+
+	if (e->preserve_ratio) {
+		double x_multiplier = grow_width / e->ref_width;
+		double y_multiplier = grow_height / e->ref_height;
+		double max_multiplier = fmax(x_multiplier, y_multiplier);
+		grow_width = e->ref_width * max_multiplier;
+		grow_height = e->ref_height * max_multiplier;
+	}
+
+	// Determine new width/height, and accommodate for floating min/max values
+	double width = e->ref_width + grow_width;
+	double height = e->ref_height + grow_height;
+	int min_width, max_width, min_height, max_height;
+	calculate_floating_constraints(con, &min_width, &max_width,
+			&min_height, &max_height);
+	width = fmax(min_width, fmin(width, max_width));
+	height = fmax(min_height, fmin(height, max_height));
+
+	// Apply the view's min/max size
+	if (con->view) {
+		double view_min_width, view_max_width, view_min_height, view_max_height;
+		view_get_constraints(con->view, &view_min_width, &view_max_width,
+				&view_min_height, &view_max_height);
+		width = fmax(view_min_width, fmin(width, view_max_width));
+		height = fmax(view_min_height, fmin(height, view_max_height));
+	}
+
+	// Recalculate these, in case we hit a min/max limit
+	grow_width = width - e->ref_width;
+	grow_height = height - e->ref_height;
+
+	// Determine grow x/y values - these are relative to the container's x/y at
+	// the start of the resize operation.
+	double grow_x = 0, grow_y = 0;
+	if (edge & WLR_EDGE_LEFT) {
+		grow_x = -grow_width;
+	} else if (edge & WLR_EDGE_RIGHT) {
+		grow_x = 0;
+	} else {
+		grow_x = -grow_width / 2;
+	}
+	if (edge & WLR_EDGE_TOP) {
+		grow_y = -grow_height;
+	} else if (edge & WLR_EDGE_BOTTOM) {
+		grow_y = 0;
+	} else {
+		grow_y = -grow_height / 2;
+	}
+
+	// Determine the amounts we need to bump everything relative to the current
+	// size.
+	int relative_grow_width = width - con->width;
+	int relative_grow_height = height - con->height;
+	int relative_grow_x = (e->ref_con_lx + grow_x) - con->x;
+	int relative_grow_y = (e->ref_con_ly + grow_y) - con->y;
+
+	// Actually resize stuff
+	con->x += relative_grow_x;
+	con->y += relative_grow_y;
+	con->width += relative_grow_width;
+	con->height += relative_grow_height;
+
+	con->content_x += relative_grow_x;
+	con->content_y += relative_grow_y;
+	con->content_width += relative_grow_width;
+	con->content_height += relative_grow_height;
+
+	arrange_container(con);
+}
+
+static void handle_finish(struct sway_seat *seat) {
+	cursor_set_image(seat->cursor, "left_ptr", NULL);
+}
+
+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_resize_floating_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_resize_floating(struct sway_seat *seat,
+		struct sway_container *con, uint32_t button, enum wlr_edges edge) {
+	seatop_abort(seat);
+
+	struct seatop_resize_floating_event *e =
+		calloc(1, sizeof(struct seatop_resize_floating_event));
+	if (!e) {
+		return;
+	}
+	e->con = con;
+
+	struct wlr_keyboard *keyboard = wlr_seat_get_keyboard(seat->wlr_seat);
+	e->preserve_ratio = keyboard &&
+		(wlr_keyboard_get_modifiers(keyboard) & WLR_MODIFIER_SHIFT);
+
+	e->edge = edge == WLR_EDGE_NONE ? WLR_EDGE_BOTTOM | WLR_EDGE_RIGHT : edge;
+	e->ref_lx = seat->cursor->cursor->x;
+	e->ref_ly = seat->cursor->cursor->y;
+	e->ref_con_lx = con->x;
+	e->ref_con_ly = con->y;
+	e->ref_width = con->width;
+	e->ref_height = con->height;
+
+	seat->seatop_impl = &seatop_impl;
+	seat->seatop_data = e;
+	seat->seatop_button = button;
+
+	container_raise_floating(con);
+
+	const char *image = edge == WLR_EDGE_NONE ?
+		"se-resize" : wlr_xcursor_get_resize_name(edge);
+	cursor_set_image(seat->cursor, image, NULL);
+}
diff --git a/sway/input/seatop_resize_tiling.c b/sway/input/seatop_resize_tiling.c
new file mode 100644
index 00000000..30431f04
--- /dev/null
+++ b/sway/input/seatop_resize_tiling.c
@@ -0,0 +1,92 @@
+#define _POSIX_C_SOURCE 200809L
+#include <wlr/types/wlr_cursor.h>
+#include "sway/commands.h"
+#include "sway/input/cursor.h"
+#include "sway/input/seat.h"
+
+struct seatop_resize_tiling_event {
+	struct sway_container *con;
+	enum wlr_edges edge;
+	double ref_lx, ref_ly;         // cursor's x/y at start of op
+	double ref_width, ref_height;  // container's size at start of op
+	double ref_con_lx, ref_con_ly; // container's x/y at start of op
+};
+
+static void handle_motion(struct sway_seat *seat, uint32_t time_msec) {
+	struct seatop_resize_tiling_event *e = seat->seatop_data;
+	int amount_x = 0;
+	int amount_y = 0;
+	int moved_x = seat->cursor->cursor->x - e->ref_lx;
+	int moved_y = seat->cursor->cursor->y - e->ref_ly;
+	enum wlr_edges edge_x = WLR_EDGE_NONE;
+	enum wlr_edges edge_y = WLR_EDGE_NONE;
+	struct sway_container *con = e->con;
+
+	if (e->edge & WLR_EDGE_TOP) {
+		amount_y = (e->ref_height - moved_y) - con->height;
+		edge_y = WLR_EDGE_TOP;
+	} else if (e->edge & WLR_EDGE_BOTTOM) {
+		amount_y = (e->ref_height + moved_y) - con->height;
+		edge_y = WLR_EDGE_BOTTOM;
+	}
+	if (e->edge & WLR_EDGE_LEFT) {
+		amount_x = (e->ref_width - moved_x) - con->width;
+		edge_x = WLR_EDGE_LEFT;
+	} else if (e->edge & WLR_EDGE_RIGHT) {
+		amount_x = (e->ref_width + moved_x) - con->width;
+		edge_x = WLR_EDGE_RIGHT;
+	}
+
+	if (amount_x != 0) {
+		container_resize_tiled(e->con, edge_x, amount_x);
+	}
+	if (amount_y != 0) {
+		container_resize_tiled(e->con, edge_y, amount_y);
+	}
+}
+
+static void handle_finish(struct sway_seat *seat) {
+	cursor_set_image(seat->cursor, "left_ptr", NULL);
+}
+
+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_resize_tiling_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_resize_tiling(struct sway_seat *seat,
+		struct sway_container *con, uint32_t button, enum wlr_edges edge) {
+	seatop_abort(seat);
+
+	struct seatop_resize_tiling_event *e =
+		calloc(1, sizeof(struct seatop_resize_tiling_event));
+	if (!e) {
+		return;
+	}
+	e->con = con;
+	e->edge = edge;
+
+	e->ref_lx = seat->cursor->cursor->x;
+	e->ref_ly = seat->cursor->cursor->y;
+	e->ref_con_lx = con->x;
+	e->ref_con_ly = con->y;
+	e->ref_width = con->width;
+	e->ref_height = con->height;
+
+	seat->seatop_impl = &seatop_impl;
+	seat->seatop_data = e;
+	seat->seatop_button = button;
+}
diff --git a/sway/meson.build b/sway/meson.build
index 98676ce0..ff326f04 100644
--- a/sway/meson.build
+++ b/sway/meson.build
@@ -23,6 +23,11 @@ sway_sources = files(
 
 	'input/input-manager.c',
 	'input/seat.c',
+	'input/seatop_down.c',
+	'input/seatop_move_floating.c',
+	'input/seatop_move_tiling.c',
+	'input/seatop_resize_floating.c',
+	'input/seatop_resize_tiling.c',
 	'input/cursor.c',
 	'input/keyboard.c',
 
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);
+	}
+}
+