Merge pull request #2027 from RyanDwyer/implement-floating

Implement floating

include/sway/tree/container.h

@@ -76,12 +76,14 @@ struct sway_container {
 	enum sway_container_layout layout;
 	enum sway_container_layout prev_layout;
 
+	bool is_sticky;
+
 	// For C_ROOT, this has no meaning
-	// For C_OUTPUT, this is the output position in layout coordinates
-	// For other types, this is the position in output-local coordinates
+	// For other types, this is the position in layout coordinates
 	// Includes borders
 	double x, y;
 	double width, height;
+	double saved_x, saved_y;
 	double saved_width, saved_height;
 
 	list_t *children;
@@ -171,6 +173,13 @@ struct sway_container *container_at(struct sway_container *container,
 		double ox, double oy, struct wlr_surface **surface,
 		double *sx, double *sy);
 
+/**
+ * Same as container_at, but only checks floating views and expects coordinates
+ * to be layout coordinates, as that's what floating views use.
+ */
+struct sway_container *floating_container_at(double lx, double ly,
+		struct wlr_surface **surface, double *sx, double *sy);
+
 /**
  * Apply the function for each descendant of the container breadth first.
  */
@@ -227,4 +236,14 @@ void container_notify_subtree_changed(struct sway_container *container);
  */
 size_t container_titlebar_height(void);
 
+void container_set_floating(struct sway_container *container, bool enable);
+
+void container_set_geometry_from_floating_view(struct sway_container *con);
+
+/**
+ * Determine if the given container is itself floating.
+ * This will return false for any descendants of a floating container.
+ */
+bool container_is_floating(struct sway_container *container);
+
 #endif

include/sway/tree/view.h

@@ -29,10 +29,11 @@ struct sway_view_impl {
 	const char *(*get_string_prop)(struct sway_view *view,
 			enum sway_view_prop prop);
 	uint32_t (*get_int_prop)(struct sway_view *view, enum sway_view_prop prop);
-	void (*configure)(struct sway_view *view, double ox, double oy, int width,
+	void (*configure)(struct sway_view *view, double lx, double ly, int width,
 		int height);
 	void (*set_activated)(struct sway_view *view, bool activated);
 	void (*set_fullscreen)(struct sway_view *view, bool fullscreen);
+	bool (*wants_floating)(struct sway_view *view);
 	void (*for_each_surface)(struct sway_view *view,
 		wlr_surface_iterator_func_t iterator, void *user_data);
 	void (*close)(struct sway_view *view);
@@ -46,10 +47,17 @@ struct sway_view {
 	struct sway_container *swayc; // NULL for unmapped views
 	struct wlr_surface *surface; // NULL for unmapped views
 
-	// Geometry of the view itself (excludes borders)
+	// Geometry of the view itself (excludes borders) in layout coordinates
 	double x, y;
 	int width, height;
 
+	double saved_x, saved_y;
+	int saved_width, saved_height;
+
+	// The size the view would want to be if it weren't tiled.
+	// Used when changing a view from tiled to floating.
+	int natural_width, natural_height;
+
 	bool is_fullscreen;
 
 	char *title_format;
@@ -131,6 +139,7 @@ struct sway_xwayland_view {
 	struct wl_listener unmap;
 	struct wl_listener destroy;
 
+	int pending_lx, pending_ly;
 	int pending_width, pending_height;
 };
 
@@ -236,7 +245,7 @@ void view_map(struct sway_view *view, struct wlr_surface *wlr_surface);
 
 void view_unmap(struct sway_view *view);
 
-void view_update_position(struct sway_view *view, double ox, double oy);
+void view_update_position(struct sway_view *view, double lx, double ly);
 
 void view_update_size(struct sway_view *view, int width, int height);
 

include/sway/tree/workspace.h

@@ -8,6 +8,7 @@ struct sway_view;
 struct sway_workspace {
 	struct sway_container *swayc;
 	struct sway_view *fullscreen;
+	struct sway_container *floating;
 };
 
 extern char *prev_workspace_name;
@@ -30,4 +31,6 @@ struct sway_container *workspace_prev(struct sway_container *current);
 
 bool workspace_is_visible(struct sway_container *ws);
 
+bool workspace_is_empty(struct sway_container *ws);
+
 #endif

sway/commands.c

@@ -110,7 +110,6 @@ static struct cmd_handler handlers[] = {
 	{ "font", cmd_font },
 	{ "for_window", cmd_for_window },
 	{ "force_focus_wrapping", cmd_force_focus_wrapping },
-	{ "fullscreen", cmd_fullscreen },
 	{ "hide_edge_borders", cmd_hide_edge_borders },
 	{ "include", cmd_include },
 	{ "input", cmd_input },
@@ -176,7 +175,9 @@ static struct cmd_handler config_handlers[] = {
 static struct cmd_handler command_handlers[] = {
 	{ "border", cmd_border },
 	{ "exit", cmd_exit },
+	{ "floating", cmd_floating },
 	{ "focus", cmd_focus },
+	{ "fullscreen", cmd_fullscreen },
 	{ "kill", cmd_kill },
 	{ "layout", cmd_layout },
 	{ "mark", cmd_mark },
@@ -189,6 +190,7 @@ static struct cmd_handler command_handlers[] = {
 	{ "splith", cmd_splith },
 	{ "splitt", cmd_splitt },
 	{ "splitv", cmd_splitv },
+	{ "sticky", cmd_sticky },
 	{ "swap", cmd_swap },
 	{ "title_format", cmd_title_format },
 	{ "unmark", cmd_unmark },

sway/commands/border.c

@@ -37,7 +37,13 @@ struct cmd_results *cmd_border(int argc, char **argv) {
 				"or 'border pixel <px>'");
 	}
 
-	view_autoconfigure(view);
+	if (container_is_floating(view->swayc)) {
+		container_damage_whole(view->swayc);
+		container_set_geometry_from_floating_view(view->swayc);
+		container_damage_whole(view->swayc);
+	} else {
+		view_autoconfigure(view);
+	}
 
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
 	if (seat->cursor) {

sway/commands/floating.c

@@ -0,0 +1,40 @@
+#include <string.h>
+#include <strings.h>
+#include "sway/commands.h"
+#include "sway/input/seat.h"
+#include "sway/ipc-server.h"
+#include "sway/output.h"
+#include "sway/tree/arrange.h"
+#include "sway/tree/container.h"
+#include "sway/tree/layout.h"
+#include "sway/tree/view.h"
+#include "list.h"
+
+struct cmd_results *cmd_floating(int argc, char **argv) {
+	struct cmd_results *error = NULL;
+	if ((error = checkarg(argc, "floating", EXPECTED_EQUAL_TO, 1))) {
+		return error;
+	}
+	struct sway_container *container =
+		config->handler_context.current_container;
+	if (container->type != C_VIEW) {
+		// TODO: This doesn't strictly speaking have to be true
+		return cmd_results_new(CMD_INVALID, "float", "Only views can float");
+	}
+
+	bool wants_floating;
+	if (strcasecmp(argv[0], "enable") == 0) {
+		wants_floating = true;
+	} else if (strcasecmp(argv[0], "disable") == 0) {
+		wants_floating = false;
+	} else if (strcasecmp(argv[0], "toggle") == 0) {
+		wants_floating = !container_is_floating(container);
+	} else {
+		return cmd_results_new(CMD_FAILURE, "floating",
+			"Expected 'floating <enable|disable|toggle>'");
+	}
+
+	container_set_floating(container, wants_floating);
+
+	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
+}

sway/commands/layout.c

@@ -12,19 +12,15 @@ struct cmd_results *cmd_layout(int argc, char **argv) {
 	}
 	struct sway_container *parent = config->handler_context.current_container;
 
-	// TODO: floating
-	/*
-	if (parent->is_floating) {
-		return cmd_results_new(CMD_FAILURE, "layout", "Unable to change layout of floating windows");
+	if (container_is_floating(parent)) {
+		return cmd_results_new(CMD_FAILURE, "layout",
+				"Unable to change layout of floating windows");
 	}
-	*/
 
 	while (parent->type == C_VIEW) {
 		parent = parent->parent;
 	}
 
-	// TODO: stacks and tabs
-
 	if (strcasecmp(argv[0], "default") == 0) {
 		parent->layout = parent->prev_layout;
 		if (parent->layout == L_NONE) {

sway/commands/move.c

@@ -13,16 +13,14 @@
 #include "stringop.h"
 #include "list.h"
 
-static const char* expected_syntax = 
+static const char* expected_syntax =
 	"Expected 'move <left|right|up|down> <[px] px>' or "
 	"'move <container|window> to workspace <name>' or "
 	"'move <container|window|workspace> to output <name|direction>' or "
 	"'move position mouse'";
 
 static struct sway_container *output_in_direction(const char *direction,
-		struct wlr_output *reference, int ref_ox, int ref_oy) {
-	int ref_lx = ref_ox + reference->lx,
-		ref_ly = ref_oy + reference->ly;
+		struct wlr_output *reference, int ref_lx, int ref_ly) {
 	struct {
 		char *name;
 		enum wlr_direction direction;

sway/commands/split.c

@@ -10,6 +10,10 @@
 
 static struct cmd_results *do_split(int layout) {
 	struct sway_container *con = config->handler_context.current_container;
+	if (container_is_floating(con)) {
+		return cmd_results_new(CMD_FAILURE, "split",
+			"Can't split a floating view");
+	}
 	struct sway_container *parent = container_split(con, layout);
 	container_create_notify(parent);
 	arrange_children_of(parent);
@@ -23,24 +27,23 @@ struct cmd_results *cmd_split(int argc, char **argv) {
 		return error;
 	}
 	if (strcasecmp(argv[0], "v") == 0 || strcasecmp(argv[0], "vertical") == 0) {
-		do_split(L_VERT);
+		return do_split(L_VERT);
 	} else if (strcasecmp(argv[0], "h") == 0 ||
 			strcasecmp(argv[0], "horizontal") == 0) {
-		do_split(L_HORIZ);
+		return do_split(L_HORIZ);
 	} else if (strcasecmp(argv[0], "t") == 0 ||
 			strcasecmp(argv[0], "toggle") == 0) {
 		struct sway_container *focused =
 			config->handler_context.current_container;
 
 		if (focused->parent->layout == L_VERT) {
-			do_split(L_HORIZ);
+			return do_split(L_HORIZ);
 		} else {
-			do_split(L_VERT);
+			return do_split(L_VERT);
 		}
 	} else {
-		error = cmd_results_new(CMD_FAILURE, "split",
+		return cmd_results_new(CMD_FAILURE, "split",
 			"Invalid split command (expected either horizontal or vertical).");
-		return error;
 	}
 	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
 }

sway/commands/sticky.c

@@ -0,0 +1,40 @@
+#include <string.h>
+#include <strings.h>
+#include "sway/commands.h"
+#include "sway/input/seat.h"
+#include "sway/ipc-server.h"
+#include "sway/output.h"
+#include "sway/tree/arrange.h"
+#include "sway/tree/container.h"
+#include "sway/tree/layout.h"
+#include "sway/tree/view.h"
+#include "list.h"
+
+struct cmd_results *cmd_sticky(int argc, char **argv) {
+	struct cmd_results *error = NULL;
+	if ((error = checkarg(argc, "sticky", EXPECTED_EQUAL_TO, 1))) {
+		return error;
+	}
+	struct sway_container *container =
+		config->handler_context.current_container;
+	if (!container_is_floating(container)) {
+		return cmd_results_new(CMD_FAILURE, "sticky",
+			"Can't set sticky on a tiled container");
+	}
+
+	bool wants_sticky;
+	if (strcasecmp(argv[0], "enable") == 0) {
+		wants_sticky = true;
+	} else if (strcasecmp(argv[0], "disable") == 0) {
+		wants_sticky = false;
+	} else if (strcasecmp(argv[0], "toggle") == 0) {
+		wants_sticky = !container->is_sticky;
+	} else {
+		return cmd_results_new(CMD_FAILURE, "sticky",
+			"Expected 'sticky <enable|disable|toggle>'");
+	}
+
+	container->is_sticky = wants_sticky;
+
+	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
+}

sway/config.c

@@ -26,6 +26,7 @@
 #include "sway/config.h"
 #include "sway/tree/arrange.h"
 #include "sway/tree/layout.h"
+#include "sway/tree/workspace.h"
 #include "cairo.h"
 #include "pango.h"
 #include "readline.h"
@@ -751,6 +752,16 @@ void config_update_font_height(bool recalculate) {
 	container_for_each_descendant_dfs(&root_container,
 			find_font_height_iterator, &recalculate);
 
+	// Also consider floating views
+	for (int i = 0; i < root_container.children->length; ++i) {
+		struct sway_container *output = root_container.children->items[i];
+		for (int j = 0; j < output->children->length; ++j) {
+			struct sway_container *ws = output->children->items[j];
+			container_for_each_descendant_dfs(ws->sway_workspace->floating,
+					find_font_height_iterator, &recalculate);
+		}
+	}
+
 	if (config->font_height != prev_max_height) {
 		arrange_root();
 	}

sway/criteria.c

@@ -121,12 +121,15 @@ static bool criteria_matches_view(struct criteria *criteria,
 	}
 
 	if (criteria->floating) {
-		// TODO
-		return false;
+		if (!container_is_floating(view->swayc)) {
+			return false;
+		}
 	}
 
 	if (criteria->tiling) {
-		// TODO
+		if (container_is_floating(view->swayc)) {
+			return false;
+		}
 	}
 
 	if (criteria->urgent) {

sway/debug-tree.c

@@ -25,9 +25,9 @@ static const char *layout_to_str(enum sway_container_layout layout) {
 	case L_FLOATING:
 		return "L_FLOATING";
 	case L_NONE:
-	default:
 		return "L_NONE";
 	}
+	return "L_NONE";
 }
 
 static int draw_container(cairo_t *cairo, struct sway_container *container,

sway/desktop/output.c

@@ -65,6 +65,13 @@ struct root_geometry {
 	float rotation;
 };
 
+struct render_data {
+	struct root_geometry root_geo;
+	struct sway_output *output;
+	pixman_region32_t *damage;
+	float alpha;
+};
+
 static bool get_surface_box(struct root_geometry *geo,
 		struct sway_output *output, struct wlr_surface *surface, int sx, int sy,
 		struct wlr_box *surface_box) {
@@ -116,8 +123,9 @@ static void surface_for_each_surface(struct wlr_surface *surface,
 static void output_view_for_each_surface(struct sway_view *view,
 		struct root_geometry *geo, wlr_surface_iterator_func_t iterator,
 		void *user_data) {
-	geo->x = view->x;
-	geo->y = view->y;
+	struct render_data *data = user_data;
+	geo->x = view->x - data->output->swayc->x;
+	geo->y = view->y - data->output->swayc->y;
 	geo->width = view->surface->current->width;
 	geo->height = view->surface->current->height;
 	geo->rotation = 0; // TODO
@@ -160,13 +168,6 @@ static void scale_box(struct wlr_box *box, float scale) {
 	box->height *= scale;
 }
 
-struct render_data {
-	struct root_geometry root_geo;
-	struct sway_output *output;
-	pixman_region32_t *damage;
-	float alpha;
-};
-
 static void scissor_output(struct wlr_output *wlr_output,
 		pixman_box32_t *rect) {
 	struct wlr_renderer *renderer = wlr_backend_get_renderer(wlr_output->backend);
@@ -275,7 +276,10 @@ static void render_rect(struct wlr_output *wlr_output,
 	struct wlr_renderer *renderer =
 		wlr_backend_get_renderer(wlr_output->backend);
 
-	struct wlr_box box = *_box;
+	struct wlr_box box;
+	memcpy(&box, _box, sizeof(struct wlr_box));
+	box.x -= wlr_output->lx * wlr_output->scale;
+	box.y -= wlr_output->ly * wlr_output->scale;
 
 	pixman_region32_t damage;
 	pixman_region32_init(&damage);
@@ -449,9 +453,10 @@ static void render_titlebar(struct sway_output *output,
 		struct wlr_box texture_box;
 		wlr_texture_get_size(marks_texture,
 			&texture_box.width, &texture_box.height);
-		texture_box.x =
-			(x + width - TITLEBAR_H_PADDING) * output_scale - texture_box.width;
-		texture_box.y = (y + TITLEBAR_V_PADDING) * output_scale;
+		texture_box.x = (x - output->swayc->x + width - TITLEBAR_H_PADDING)
+			* output_scale - texture_box.width;
+		texture_box.y = (y - output->swayc->y + TITLEBAR_V_PADDING)
+			* output_scale;
 
 		float matrix[9];
 		wlr_matrix_project_box(matrix, &texture_box,
@@ -472,8 +477,10 @@ static void render_titlebar(struct sway_output *output,
 		struct wlr_box texture_box;
 		wlr_texture_get_size(title_texture,
 			&texture_box.width, &texture_box.height);
-		texture_box.x = (x + TITLEBAR_H_PADDING) * output_scale;
-		texture_box.y = (y + TITLEBAR_V_PADDING) * output_scale;
+		texture_box.x = (x - output->swayc->x + TITLEBAR_H_PADDING)
+			* output_scale;
+		texture_box.y = (y - output->swayc->y + TITLEBAR_V_PADDING)
+			* output_scale;
 
 		float matrix[9];
 		wlr_matrix_project_box(matrix, &texture_box,
@@ -755,8 +762,58 @@ static void render_container(struct sway_output *output,
 		render_container_tabbed(output, damage, con, parent_focused);
 		break;
 	case L_FLOATING:
-		// TODO
-		break;
+		sway_assert(false, "Didn't expect to see floating here");
+	}
+}
+
+static void render_floating_container(struct sway_output *soutput,
+		pixman_region32_t *damage, struct sway_container *con) {
+	if (con->type == C_VIEW) {
+		struct sway_view *view = con->sway_view;
+		struct sway_seat *seat = input_manager_current_seat(input_manager);
+		struct sway_container *focus = seat_get_focus(seat);
+		struct border_colors *colors;
+		struct wlr_texture *title_texture;
+		struct wlr_texture *marks_texture;
+
+		if (focus == con) {
+			colors = &config->border_colors.focused;
+			title_texture = con->title_focused;
+			marks_texture = view->marks_focused;
+		} else {
+			colors = &config->border_colors.unfocused;
+			title_texture = con->title_unfocused;
+			marks_texture = view->marks_unfocused;
+		}
+
+		if (con->sway_view->border == B_NORMAL) {
+			render_titlebar(soutput, damage, con, con->x, con->y, con->width,
+					colors, title_texture, marks_texture);
+		} else {
+			render_top_border(soutput, damage, con, colors);
+		}
+		render_view(soutput, damage, con, colors);
+	} else {
+		render_container(soutput, damage, con, false);
+	}
+}
+
+static void render_floating(struct sway_output *soutput,
+		pixman_region32_t *damage) {
+	for (int i = 0; i < root_container.children->length; ++i) {
+		struct sway_container *output = root_container.children->items[i];
+		for (int j = 0; j < output->children->length; ++j) {
+			struct sway_container *workspace = output->children->items[j];
+			struct sway_workspace *ws = workspace->sway_workspace;
+			if (!workspace_is_visible(workspace)) {
+				continue;
+			}
+			for (int k = 0; k < ws->floating->children->length; ++k) {
+				struct sway_container *floater =
+					ws->floating->children->items[k];
+				render_floating_container(soutput, damage, floater);
+			}
+		}
 	}
 }
 
@@ -794,8 +851,6 @@ static void render_output(struct sway_output *output, struct timespec *when,
 		goto renderer_end;
 	}
 
-	//wlr_renderer_clear(renderer, (float[]){1, 1, 0, 1});
-
 	struct sway_container *workspace = output_get_active_workspace(output);
 
 	if (workspace->sway_workspace->fullscreen) {
@@ -834,6 +889,7 @@ static void render_output(struct sway_output *output, struct timespec *when,
 		struct sway_seat *seat = input_manager_current_seat(input_manager);
 		struct sway_container *focus = seat_get_focus(seat);
 		render_container(output, damage, workspace, focus == workspace);
+		render_floating(output, damage);
 
 		render_unmanaged(output, damage,
 			&root_container.sway_root->xwayland_unmanaged);
@@ -915,6 +971,7 @@ static void send_frame_done(struct sway_output *output, struct timespec *when) {
 
 	struct sway_container *workspace = output_get_active_workspace(output);
 	send_frame_done_container(&data, workspace);
+	send_frame_done_container(&data, workspace->sway_workspace->floating);
 
 	send_frame_done_unmanaged(&data,
 		&root_container.sway_root->xwayland_unmanaged);
@@ -1052,21 +1109,14 @@ static void output_damage_whole_container_iterator(struct sway_container *con,
 
 void output_damage_whole_container(struct sway_output *output,
 		struct sway_container *con) {
-	float scale = output->wlr_output->scale;
 	struct wlr_box box = {
-		.x = con->x * scale,
-		.y = con->y * scale,
-		.width = con->width * scale,
-		.height = con->height * scale,
+		.x = con->x - output->wlr_output->lx,
+		.y = con->y - output->wlr_output->ly,
+		.width = con->width,
+		.height = con->height,
 	};
+	scale_box(&box, output->wlr_output->scale);
 	wlr_output_damage_add_box(output->damage, &box);
-
-	if (con->type == C_VIEW) {
-		output_damage_whole_container_iterator(con, output);
-	} else {
-		container_descendants(con, C_VIEW,
-			output_damage_whole_container_iterator, output);
-	}
 }
 
 static void damage_handle_destroy(struct wl_listener *listener, void *data) {

sway/desktop/xdg_shell.c

@@ -87,7 +87,7 @@ static const char *get_string_prop(struct sway_view *view, enum sway_view_prop p
 	}
 }
 
-static void configure(struct sway_view *view, double ox, double oy, int width,
+static void configure(struct sway_view *view, double lx, double ly, int width,
 		int height) {
 	struct sway_xdg_shell_view *xdg_shell_view =
 		xdg_shell_view_from_view(view);
@@ -98,6 +98,7 @@ static void configure(struct sway_view *view, double ox, double oy, int width,
 	xdg_shell_view->pending_width = width;
 	xdg_shell_view->pending_height = height;
 	wlr_xdg_toplevel_set_size(view->wlr_xdg_surface, width, height);
+	view_update_position(view, lx, ly);
 }
 
 static void set_activated(struct sway_view *view, bool activated) {
@@ -118,6 +119,14 @@ static void set_fullscreen(struct sway_view *view, bool fullscreen) {
 	wlr_xdg_toplevel_set_fullscreen(surface, fullscreen);
 }
 
+static bool wants_floating(struct sway_view *view) {
+	struct wlr_xdg_toplevel_state *state =
+		&view->wlr_xdg_surface->toplevel->current;
+	return state->min_width != 0 && state->min_height != 0
+		&& state->min_width == state->max_width
+		&& state->min_height == state->max_height;
+}
+
 static void for_each_surface(struct sway_view *view,
 		wlr_surface_iterator_func_t iterator, void *user_data) {
 	if (xdg_shell_view_from_view(view) == NULL) {
@@ -155,6 +164,7 @@ static const struct sway_view_impl view_impl = {
 	.configure = configure,
 	.set_activated = set_activated,
 	.set_fullscreen = set_fullscreen,
+	.wants_floating = wants_floating,
 	.for_each_surface = for_each_surface,
 	.close = _close,
 	.destroy = destroy,
@@ -164,11 +174,18 @@ static void handle_commit(struct wl_listener *listener, void *data) {
 	struct sway_xdg_shell_view *xdg_shell_view =
 		wl_container_of(listener, xdg_shell_view, commit);
 	struct sway_view *view = &xdg_shell_view->view;
-	// NOTE: We intentionally discard the view's desired width here
-	// TODO: Store this for restoration when moving to floating plane
-	// TODO: Let floating views do whatever
-	view_update_size(view, xdg_shell_view->pending_width,
-		xdg_shell_view->pending_height);
+	if (view->swayc && container_is_floating(view->swayc)) {
+		int width = view->wlr_xdg_surface->geometry.width;
+		int height = view->wlr_xdg_surface->geometry.height;
+		if (!width && !height) {
+			width = view->wlr_xdg_surface->surface->current->width;
+			height = view->wlr_xdg_surface->surface->current->height;
+		}
+		view_update_size(view, width, height);
+	} else {
+		view_update_size(view, xdg_shell_view->pending_width,
+				xdg_shell_view->pending_height);
+	}
 	view_update_title(view, false);
 	view_damage_from(view);
 }
@@ -196,6 +213,12 @@ static void handle_map(struct wl_listener *listener, void *data) {
 	struct sway_view *view = &xdg_shell_view->view;
 	struct wlr_xdg_surface *xdg_surface = view->wlr_xdg_surface;
 
+	view->natural_width = view->wlr_xdg_surface->geometry.width;
+	view->natural_height = view->wlr_xdg_surface->geometry.height;
+	if (!view->natural_width && !view->natural_height) {
+		view->natural_width = view->wlr_xdg_surface->surface->current->width;
+		view->natural_height = view->wlr_xdg_surface->surface->current->height;
+	}
 	view_map(view, view->wlr_xdg_surface->surface);
 
 	xdg_shell_view->commit.notify = handle_commit;

sway/desktop/xdg_shell_v6.c

@@ -86,7 +86,7 @@ static const char *get_string_prop(struct sway_view *view, enum sway_view_prop p
 	}
 }
 
-static void configure(struct sway_view *view, double ox, double oy, int width,
+static void configure(struct sway_view *view, double lx, double ly, int width,
 		int height) {
 	struct sway_xdg_shell_v6_view *xdg_shell_v6_view =
 		xdg_shell_v6_view_from_view(view);
@@ -97,6 +97,7 @@ static void configure(struct sway_view *view, double ox, double oy, int width,
 	xdg_shell_v6_view->pending_width = width;
 	xdg_shell_v6_view->pending_height = height;
 	wlr_xdg_toplevel_v6_set_size(view->wlr_xdg_surface_v6, width, height);
+	view_update_position(view, lx, ly);
 }
 
 static void set_activated(struct sway_view *view, bool activated) {
@@ -117,6 +118,14 @@ static void set_fullscreen(struct sway_view *view, bool fullscreen) {
 	wlr_xdg_toplevel_v6_set_fullscreen(surface, fullscreen);
 }
 
+static bool wants_floating(struct sway_view *view) {
+	struct wlr_xdg_toplevel_v6_state *state =
+		&view->wlr_xdg_surface_v6->toplevel->current;
+	return state->min_width != 0 && state->min_height != 0
+		&& state->min_width == state->max_width
+		&& state->min_height == state->max_height;
+}
+
 static void for_each_surface(struct sway_view *view,
 		wlr_surface_iterator_func_t iterator, void *user_data) {
 	if (xdg_shell_v6_view_from_view(view) == NULL) {
@@ -154,6 +163,7 @@ static const struct sway_view_impl view_impl = {
 	.configure = configure,
 	.set_activated = set_activated,
 	.set_fullscreen = set_fullscreen,
+	.wants_floating = wants_floating,
 	.for_each_surface = for_each_surface,
 	.close = _close,
 	.destroy = destroy,
@@ -163,11 +173,18 @@ static void handle_commit(struct wl_listener *listener, void *data) {
 	struct sway_xdg_shell_v6_view *xdg_shell_v6_view =
 		wl_container_of(listener, xdg_shell_v6_view, commit);
 	struct sway_view *view = &xdg_shell_v6_view->view;
-	// NOTE: We intentionally discard the view's desired width here
-	// TODO: Store this for restoration when moving to floating plane
-	// TODO: Let floating views do whatever
-	view_update_size(view, xdg_shell_v6_view->pending_width,
-		xdg_shell_v6_view->pending_height);
+	if (view->swayc && container_is_floating(view->swayc)) {
+		int width = view->wlr_xdg_surface_v6->geometry.width;
+		int height = view->wlr_xdg_surface_v6->geometry.height;
+		if (!width && !height) {
+			width = view->wlr_xdg_surface_v6->surface->current->width;
+			height = view->wlr_xdg_surface_v6->surface->current->height;
+		}
+		view_update_size(view, width, height);
+	} else {
+		view_update_size(view, xdg_shell_v6_view->pending_width,
+				xdg_shell_v6_view->pending_height);
+	}
 	view_update_title(view, false);
 	view_damage_from(view);
 }
@@ -195,6 +212,12 @@ static void handle_map(struct wl_listener *listener, void *data) {
 	struct sway_view *view = &xdg_shell_v6_view->view;
 	struct wlr_xdg_surface_v6 *xdg_surface = view->wlr_xdg_surface_v6;
 
+	view->natural_width = view->wlr_xdg_surface_v6->geometry.width;
+	view->natural_height = view->wlr_xdg_surface_v6->geometry.height;
+	if (!view->natural_width && !view->natural_height) {
+		view->natural_width = view->wlr_xdg_surface_v6->surface->current->width;
+		view->natural_height = view->wlr_xdg_surface_v6->surface->current->height;
+	}
 	view_map(view, view->wlr_xdg_surface_v6->surface);
 
 	xdg_shell_v6_view->commit.notify = handle_commit;

sway/desktop/xwayland.c

@@ -152,7 +152,7 @@ static uint32_t get_int_prop(struct sway_view *view, enum sway_view_prop prop) {
 	}
 }
 
-static void configure(struct sway_view *view, double ox, double oy, int width,
+static void configure(struct sway_view *view, double lx, double ly, int width,
 		int height) {
 	struct sway_xwayland_view *xwayland_view = xwayland_view_from_view(view);
 	if (xwayland_view == NULL) {
@@ -160,25 +160,11 @@ static void configure(struct sway_view *view, double ox, double oy, int width,
 	}
 	struct wlr_xwayland_surface *xsurface = view->wlr_xwayland_surface;
 
-	struct sway_container *output = container_parent(view->swayc, C_OUTPUT);
-	if (!sway_assert(output, "view must be within tree to set position")) {
-		return;
-	}
-	struct sway_container *root = container_parent(output, C_ROOT);
-	if (!sway_assert(root, "output must be within tree to set position")) {
-		return;
-	}
-	struct wlr_output_layout *layout = root->sway_root->output_layout;
-	struct wlr_output_layout_output *loutput =
-		wlr_output_layout_get(layout, output->sway_output->wlr_output);
-	if (!sway_assert(loutput, "output must be within layout to set position")) {
-		return;
-	}
-
+	xwayland_view->pending_lx = lx;
+	xwayland_view->pending_ly = ly;
 	xwayland_view->pending_width = width;
 	xwayland_view->pending_height = height;
-	wlr_xwayland_surface_configure(xsurface, ox + loutput->x, oy + loutput->y,
-		width, height);
+	wlr_xwayland_surface_configure(xsurface, lx, ly, width, height);
 }
 
 static void set_activated(struct sway_view *view, bool activated) {
@@ -197,6 +183,19 @@ static void set_fullscreen(struct sway_view *view, bool fullscreen) {
 	wlr_xwayland_surface_set_fullscreen(surface, fullscreen);
 }
 
+static bool wants_floating(struct sway_view *view) {
+	// TODO:
+	// We want to return true if the window type contains any of these:
+	// NET_WM_WINDOW_TYPE_DIALOG
+	// NET_WM_WINDOW_TYPE_UTILITY
+	// NET_WM_WINDOW_TYPE_TOOLBAR
+	// NET_WM_WINDOW_TYPE_SPLASH
+	//
+	// We also want to return true if the NET_WM_STATE is MODAL.
+	// wlroots doesn't appear to provide all this information at the moment.
+	return false;
+}
+
 static void _close(struct sway_view *view) {
 	if (xwayland_view_from_view(view) == NULL) {
 		return;
@@ -226,6 +225,7 @@ static const struct sway_view_impl view_impl = {
 	.configure = configure,
 	.set_activated = set_activated,
 	.set_fullscreen = set_fullscreen,
+	.wants_floating = wants_floating,
 	.close = _close,
 	.destroy = destroy,
 };
@@ -234,10 +234,15 @@ static void handle_commit(struct wl_listener *listener, void *data) {
 	struct sway_xwayland_view *xwayland_view =
 		wl_container_of(listener, xwayland_view, commit);
 	struct sway_view *view = &xwayland_view->view;
-	// NOTE: We intentionally discard the view's desired width here
-	// TODO: Let floating views do whatever
-	view_update_size(view, xwayland_view->pending_width,
-		xwayland_view->pending_height);
+	struct wlr_xwayland_surface *xsurface = view->wlr_xwayland_surface;
+	if (view->swayc && container_is_floating(view->swayc)) {
+		view_update_size(view, xsurface->width, xsurface->height);
+	} else {
+		view_update_size(view, xwayland_view->pending_width,
+				xwayland_view->pending_height);
+	}
+	view_update_position(view,
+			xwayland_view->pending_lx, xwayland_view->pending_ly);
 	view_damage_from(view);
 }
 
@@ -254,6 +259,9 @@ static void handle_map(struct wl_listener *listener, void *data) {
 	struct wlr_xwayland_surface *xsurface = data;
 	struct sway_view *view = &xwayland_view->view;
 
+	view->natural_width = xsurface->width;
+	view->natural_height = xsurface->height;
+
 	// Wire up the commit listener here, because xwayland map/unmap can change
 	// the underlying wlr_surface
 	wl_signal_add(&xsurface->surface->events.commit, &xwayland_view->commit);

sway/input/cursor.c

@@ -46,7 +46,7 @@ static struct wlr_surface *layer_surface_at(struct sway_output *output,
  * location, it is stored in **surface (it may not be a view).
  */
 static struct sway_container *container_at_coords(
-		struct sway_seat *seat, double x, double y,
+		struct sway_seat *seat, double lx, double ly,
 		struct wlr_surface **surface, double *sx, double *sy) {
 	// check for unmanaged views first
 	struct wl_list *unmanaged = &root_container.sway_root->xwayland_unmanaged;
@@ -55,8 +55,8 @@ static struct sway_container *container_at_coords(
 		struct wlr_xwayland_surface *xsurface =
 			unmanaged_surface->wlr_xwayland_surface;
 
-		double _sx = x - unmanaged_surface->lx;
-		double _sy = y - unmanaged_surface->ly;
+		double _sx = lx - unmanaged_surface->lx;
+		double _sy = ly - unmanaged_surface->ly;
 		if (wlr_surface_point_accepts_input(xsurface->surface, _sx, _sy)) {
 			*surface = xsurface->surface;
 			*sx = _sx;
@@ -69,12 +69,12 @@ static struct sway_container *container_at_coords(
 	struct wlr_output_layout *output_layout =
 		root_container.sway_root->output_layout;
 	struct wlr_output *wlr_output = wlr_output_layout_output_at(
-			output_layout, x, y);
+			output_layout, lx, ly);
 	if (wlr_output == NULL) {
 		return NULL;
 	}
 	struct sway_output *output = wlr_output->data;
-	double ox = x, oy = y;
+	double ox = lx, oy = ly;
 	wlr_output_layout_output_coords(output_layout, wlr_output, &ox, &oy);
 
 	// find the focused workspace on the output for this seat
@@ -108,7 +108,10 @@ static struct sway_container *container_at_coords(
 	}
 
 	struct sway_container *c;
-	if ((c = container_at(ws, ox, oy, surface, sx, sy))) {
+	if ((c = floating_container_at(lx, ly, surface, sx, sy))) {
+		return c;
+	}
+	if ((c = container_at(ws, lx, ly, surface, sx, sy))) {
 		return c;
 	}
 

sway/input/seat.c

@@ -113,7 +113,14 @@ static void seat_send_focus(struct sway_container *con,
 
 static struct sway_container *seat_get_focus_by_type(struct sway_seat *seat,
 		struct sway_container *container, enum sway_container_type type) {
-	if (container->type == C_VIEW || container->children->length == 0) {
+	if (container->type == C_VIEW) {
+		return container;
+	}
+
+	struct sway_container *floating = container->type == C_WORKSPACE ?
+		container->sway_workspace->floating : NULL;
+	if (container->children->length == 0 &&
+			(!floating || floating->children->length == 0)) {
 		return container;
 	}
 
@@ -126,6 +133,9 @@ static struct sway_container *seat_get_focus_by_type(struct sway_seat *seat,
 		if (container_has_child(container, current->container)) {
 			return current->container;
 		}
+		if (floating && container_has_child(floating, current->container)) {
+			return current->container;
+		}
 	}
 
 	return NULL;
@@ -568,7 +578,7 @@ void seat_set_focus_warp(struct sway_seat *seat,
 	// clean up unfocused empty workspace on new output
 	if (new_output_last_ws) {
 		if (!workspace_is_visible(new_output_last_ws)
-				&& new_output_last_ws->children->length == 0) {
+				&& workspace_is_empty(new_output_last_ws)) {
 			if (last_workspace == new_output_last_ws) {
 				last_focus = NULL;
 				last_workspace = NULL;
@@ -581,7 +591,7 @@ void seat_set_focus_warp(struct sway_seat *seat,
 		if (last_workspace) {
 			ipc_event_workspace(last_workspace, container, "focus");
 			if (!workspace_is_visible(last_workspace)
-					&& last_workspace->children->length == 0) {
+					&& workspace_is_empty(last_workspace)) {
 				if (last_workspace == last_focus) {
 					last_focus = NULL;
 				}
@@ -591,10 +601,8 @@ void seat_set_focus_warp(struct sway_seat *seat,
 
 		if (config->mouse_warping && warp) {
 			if (new_output && last_output && new_output != last_output) {
-				double x = new_output->x + container->x +
-					container->width / 2.0;
-				double y = new_output->y + container->y +
-					container->height / 2.0;
+				double x = container->x + container->width / 2.0;
+				double y = container->y + container->height / 2.0;
 				struct wlr_output *wlr_output =
 					new_output->sway_output->wlr_output;
 				if (!wlr_output_layout_contains_point(

sway/ipc-json.c

@@ -4,6 +4,7 @@
 #include "log.h"
 #include "sway/ipc-json.h"
 #include "sway/tree/container.h"
+#include "sway/tree/workspace.h"
 #include "sway/output.h"
 #include "sway/input/input-manager.h"
 #include "sway/input/seat.h"
@@ -152,6 +153,15 @@ static void ipc_json_describe_workspace(struct sway_container *workspace,
 
 	const char *layout = ipc_json_layout_description(workspace->layout);
 	json_object_object_add(object, "layout", json_object_new_string(layout));
+
+	// Floating
+	json_object *floating_array = json_object_new_array();
+	struct sway_container *floating = workspace->sway_workspace->floating;
+	for (int i = 0; i < floating->children->length; ++i) {
+		struct sway_container *floater = floating->children->items[i];
+		json_object_array_add(floating_array, ipc_json_describe_container_recursive(floater));
+	}
+	json_object_object_add(object, "floating_nodes", floating_array);
 }
 
 static void ipc_json_describe_view(struct sway_container *c, json_object *object) {

sway/meson.build

@@ -36,6 +36,7 @@ sway_sources = files(
 	'commands/exit.c',
 	'commands/exec.c',
 	'commands/exec_always.c',
+	'commands/floating.c',
 	'commands/focus.c',
 	'commands/focus_follows_mouse.c',
 	'commands/focus_wrapping.c',
@@ -64,6 +65,7 @@ sway_sources = files(
 	'commands/set.c',
 	'commands/show_marks.c',
 	'commands/split.c',
+	'commands/sticky.c',
 	'commands/swaybg_command.c',
 	'commands/swap.c',
 	'commands/title_format.c',

sway/tree/arrange.c

@@ -73,8 +73,8 @@ void arrange_workspace(struct sway_container *workspace) {
 			area->width, area->height, area->x, area->y);
 	workspace->width = area->width;
 	workspace->height = area->height;
-	workspace->x = area->x;
-	workspace->y = area->y;
+	workspace->x = output->x + area->x;
+	workspace->y = output->y + area->y;
 	wlr_log(L_DEBUG, "Arranging workspace '%s' at %f, %f",
 			workspace->name, workspace->x, workspace->y);
 	arrange_children_of(workspace);
@@ -247,6 +247,18 @@ void arrange_children_of(struct sway_container *parent) {
 			arrange_children_of(child);
 		}
 	}
+
+	// If container is a workspace, process floating containers too
+	if (parent->type == C_WORKSPACE) {
+		struct sway_workspace *ws = workspace->sway_workspace;
+		for (int i = 0; i < ws->floating->children->length; ++i) {
+			struct sway_container *child = ws->floating->children->items[i];
+			if (child->type != C_VIEW) {
+				arrange_children_of(child);
+			}
+		}
+	}
+
 	container_damage_whole(parent);
 	update_debug_tree();
 }

sway/tree/container.c

@@ -64,16 +64,6 @@ void container_create_notify(struct sway_container *container) {
 	}
 }
 
-static void container_close_notify(struct sway_container *container) {
-	if (container == NULL) {
-		return;
-	}
-	// TODO send ipc event type based on the container type
-	if (container->type == C_VIEW || container->type == C_WORKSPACE) {
-		ipc_event_window(container, "close");
-	}
-}
-
 static void container_update_textures_recursive(struct sway_container *con) {
 	container_update_title_textures(con);
 
@@ -143,7 +133,6 @@ static void _container_destroy(struct sway_container *cont) {
 	}
 
 	wl_signal_emit(&cont->events.destroy, cont);
-	container_close_notify(cont);
 
 	struct sway_container *parent = cont->parent;
 	if (cont->children != NULL && cont->children->length) {
@@ -151,6 +140,7 @@ static void _container_destroy(struct sway_container *cont) {
 		// container_remove_child, which removes child from this container
 		while (cont->children != NULL && cont->children->length > 0) {
 			struct sway_container *child = cont->children->items[0];
+			ipc_event_window(child, "close");
 			container_remove_child(child);
 			_container_destroy(child);
 		}
@@ -188,15 +178,13 @@ static struct sway_container *container_workspace_destroy(
 		return NULL;
 	}
 
+	wlr_log(L_DEBUG, "destroying workspace '%s'", workspace->name);
+	ipc_event_window(workspace, "close");
+
 	struct sway_container *parent = workspace->parent;
-	if (workspace->children->length == 0) {
-		// destroy the WS if there are no children (TODO check for floating)
-		wlr_log(L_DEBUG, "destroying workspace '%s'", workspace->name);
-		ipc_event_workspace(workspace, NULL, "empty");
-	} else if (output) {
+	if (!workspace_is_empty(workspace) && output) {
 		// Move children to a different workspace on this output
 		struct sway_container *new_workspace = NULL;
-		// TODO move floating
 		for (int i = 0; i < output->children->length; i++) {
 			if (output->children->items[i] != workspace) {
 				new_workspace = output->children->items[i];
@@ -209,6 +197,11 @@ static struct sway_container *container_workspace_destroy(
 		for (int i = 0; i < workspace->children->length; i++) {
 			container_move_to(workspace->children->items[i], new_workspace);
 		}
+		struct sway_container *floating = workspace->sway_workspace->floating;
+		for (int i = 0; i < floating->children->length; i++) {
+			container_move_to(floating->children->items[i],
+					new_workspace->sway_workspace->floating);
+		}
 	}
 
 	free(workspace->sway_workspace);
@@ -275,13 +268,17 @@ static void container_root_finish(struct sway_container *con) {
 }
 
 bool container_reap_empty(struct sway_container *con) {
+	if (con->layout == L_FLOATING) {
+		// Don't reap the magical floating container that each workspace has
+		return false;
+	}
 	switch (con->type) {
 	case C_ROOT:
 	case C_OUTPUT:
 		// dont reap these
 		break;
 	case C_WORKSPACE:
-		if (!workspace_is_visible(con) && con->children->length == 0) {
+		if (!workspace_is_visible(con) && workspace_is_empty(con)) {
 			wlr_log(L_DEBUG, "Destroying workspace via reaper");
 			container_workspace_destroy(con);
 			return true;
@@ -349,10 +346,12 @@ struct sway_container *container_destroy(struct sway_container *con) {
 			if (con->children->length) {
 				for (int i = 0; i < con->children->length; ++i) {
 					struct sway_container *child = con->children->items[0];
+					ipc_event_window(child, "close");
 					container_remove_child(child);
 					container_add_child(parent, child);
 				}
 			}
+			ipc_event_window(con, "close");
 			_container_destroy(con);
 			break;
 		case C_VIEW:
@@ -436,7 +435,6 @@ struct sway_container *container_find(struct sway_container *container,
 	if (!container->children) {
 		return NULL;
 	}
-	// TODO: floating windows
 	for (int i = 0; i < container->children->length; ++i) {
 		struct sway_container *child = container->children->items[i];
 		if (test(child, data)) {
@@ -448,6 +446,9 @@ struct sway_container *container_find(struct sway_container *container,
 			}
 		}
 	}
+	if (container->type == C_WORKSPACE) {
+		return container_find(container->sway_workspace->floating, test, data);
+	}
 	return NULL;
 }
 
@@ -466,14 +467,14 @@ struct sway_container *container_parent(struct sway_container *container,
 }
 
 static struct sway_container *container_at_view(struct sway_container *swayc,
-		double ox, double oy,
+		double lx, double ly,
 		struct wlr_surface **surface, double *sx, double *sy) {
 	if (!sway_assert(swayc->type == C_VIEW, "Expected a view")) {
 		return NULL;
 	}
 	struct sway_view *sview = swayc->sway_view;
-	double view_sx = ox - sview->x;
-	double view_sy = oy - sview->y;
+	double view_sx = lx - sview->x;
+	double view_sy = ly - sview->y;
 
 	double _sx, _sy;
 	struct wlr_surface *_surface = NULL;
@@ -515,18 +516,18 @@ static struct sway_container *container_at_view(struct sway_container *swayc,
  * container_at for a container with layout L_TABBED.
  */
 static struct sway_container *container_at_tabbed(struct sway_container *parent,
-		double ox, double oy,
+		double lx, double ly,
 		struct wlr_surface **surface, double *sx, double *sy) {
-	if (oy < parent->y || oy > parent->y + parent->height) {
+	if (ly < parent->y || ly > parent->y + parent->height) {
 		return NULL;
 	}
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
 
 	// Tab titles
 	int title_height = container_titlebar_height();
-	if (oy < parent->y + title_height) {
+	if (ly < parent->y + title_height) {
 		int tab_width = parent->width / parent->children->length;
-		int child_index = (ox - parent->x) / tab_width;
+		int child_index = (lx - parent->x) / tab_width;
 		if (child_index >= parent->children->length) {
 			child_index = parent->children->length - 1;
 		}
@@ -537,23 +538,23 @@ static struct sway_container *container_at_tabbed(struct sway_container *parent,
 	// Surfaces
 	struct sway_container *current = seat_get_active_child(seat, parent);
 
-	return container_at(current, ox, oy, surface, sx, sy);
+	return container_at(current, lx, ly, surface, sx, sy);
 }
 
 /**
  * container_at for a container with layout L_STACKED.
  */
 static struct sway_container *container_at_stacked(
-		struct sway_container *parent, double ox, double oy,
+		struct sway_container *parent, double lx, double ly,
 		struct wlr_surface **surface, double *sx, double *sy) {
-	if (oy < parent->y || oy > parent->y + parent->height) {
+	if (ly < parent->y || ly > parent->y + parent->height) {
 		return NULL;
 	}
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
 
 	// Title bars
 	int title_height = container_titlebar_height();
-	int child_index = (oy - parent->y) / title_height;
+	int child_index = (ly - parent->y) / title_height;
 	if (child_index < parent->children->length) {
 		struct sway_container *child = parent->children->items[child_index];
 		return seat_get_focus_inactive(seat, child);
@@ -562,14 +563,14 @@ static struct sway_container *container_at_stacked(
 	// Surfaces
 	struct sway_container *current = seat_get_active_child(seat, parent);
 
-	return container_at(current, ox, oy, surface, sx, sy);
+	return container_at(current, lx, ly, surface, sx, sy);
 }
 
 /**
  * container_at for a container with layout L_HORIZ or L_VERT.
  */
 static struct sway_container *container_at_linear(struct sway_container *parent,
-		double ox, double oy,
+		double lx, double ly,
 		struct wlr_surface **surface, double *sx, double *sy) {
 	for (int i = 0; i < parent->children->length; ++i) {
 		struct sway_container *child = parent->children->items[i];
@@ -579,22 +580,22 @@ static struct sway_container *container_at_linear(struct sway_container *parent,
 			.width = child->width,
 			.height = child->height,
 		};
-		if (wlr_box_contains_point(&box, ox, oy)) {
-			return container_at(child, ox, oy, surface, sx, sy);
+		if (wlr_box_contains_point(&box, lx, ly)) {
+			return container_at(child, lx, ly, surface, sx, sy);
 		}
 	}
 	return NULL;
 }
 
 struct sway_container *container_at(struct sway_container *parent,
-		double ox, double oy,
+		double lx, double ly,
 		struct wlr_surface **surface, double *sx, double *sy) {
 	if (!sway_assert(parent->type >= C_WORKSPACE,
 				"Expected workspace or deeper")) {
 		return NULL;
 	}
 	if (parent->type == C_VIEW) {
-		return container_at_view(parent, ox, oy, surface, sx, sy);
+		return container_at_view(parent, lx, ly, surface, sx, sy);
 	}
 	if (!parent->children->length) {
 		return NULL;
@@ -603,13 +604,14 @@ struct sway_container *container_at(struct sway_container *parent,
 	switch (parent->layout) {
 	case L_HORIZ:
 	case L_VERT:
-		return container_at_linear(parent, ox, oy, surface, sx, sy);
+		return container_at_linear(parent, lx, ly, surface, sx, sy);
 	case L_TABBED:
-		return container_at_tabbed(parent, ox, oy, surface, sx, sy);
+		return container_at_tabbed(parent, lx, ly, surface, sx, sy);
 	case L_STACKED:
-		return container_at_stacked(parent, ox, oy, surface, sx, sy);
+		return container_at_stacked(parent, lx, ly, surface, sx, sy);
 	case L_FLOATING:
-		return NULL; // TODO
+		sway_assert(false, "Didn't expect to see floating here");
+		return NULL;
 	case L_NONE:
 		return NULL;
 	}
@@ -617,6 +619,34 @@ struct sway_container *container_at(struct sway_container *parent,
 	return NULL;
 }
 
+struct sway_container *floating_container_at(double lx, double ly,
+		struct wlr_surface **surface, double *sx, double *sy) {
+	for (int i = 0; i < root_container.children->length; ++i) {
+		struct sway_container *output = root_container.children->items[i];
+		for (int j = 0; j < output->children->length; ++j) {
+			struct sway_container *workspace = output->children->items[j];
+			struct sway_workspace *ws = workspace->sway_workspace;
+			if (!workspace_is_visible(workspace)) {
+				continue;
+			}
+			for (int k = 0; k < ws->floating->children->length; ++k) {
+				struct sway_container *floater =
+					ws->floating->children->items[k];
+				struct wlr_box box = {
+					.x = floater->x,
+					.y = floater->y,
+					.width = floater->width,
+					.height = floater->height,
+				};
+				if (wlr_box_contains_point(&box, lx, ly)) {
+					return container_at(floater, lx, ly, surface, sx, sy);
+				}
+			}
+		}
+	}
+	return NULL;
+}
+
 void container_for_each_descendant_dfs(struct sway_container *container,
 		void (*f)(struct sway_container *container, void *data),
 		void *data) {
@@ -674,7 +704,7 @@ static bool find_child_func(struct sway_container *con, void *data) {
 
 bool container_has_child(struct sway_container *con,
 		struct sway_container *child) {
-	if (con == NULL || con->type == C_VIEW || con->children->length == 0) {
+	if (con == NULL || con->type == C_VIEW) {
 		return false;
 	}
 	return container_find(con, find_child_func, child);
@@ -866,3 +896,60 @@ void container_notify_subtree_changed(struct sway_container *container) {
 size_t container_titlebar_height() {
 	return config->font_height + TITLEBAR_V_PADDING * 2;
 }
+
+void container_set_floating(struct sway_container *container, bool enable) {
+	if (container_is_floating(container) == enable) {
+		return;
+	}
+
+	struct sway_container *workspace = container_parent(container, C_WORKSPACE);
+	struct sway_seat *seat = input_manager_current_seat(input_manager);
+	container_damage_whole(container);
+
+	if (enable) {
+		container_remove_child(container);
+		container_add_child(workspace->sway_workspace->floating, container);
+		if (container->type == C_VIEW) {
+			view_autoconfigure(container->sway_view);
+		}
+		seat_set_focus(seat, seat_get_focus_inactive(seat, container));
+		container_reap_empty_recursive(workspace);
+	} else {
+		// Returning to tiled
+		container_remove_child(container);
+		container_add_child(workspace, container);
+		container->width = container->parent->width;
+		container->height = container->parent->height;
+		container->is_sticky = false;
+		container_reap_empty_recursive(workspace->sway_workspace->floating);
+	}
+	arrange_workspace(workspace);
+	container_damage_whole(container);
+}
+
+void container_set_geometry_from_floating_view(struct sway_container *con) {
+	if (!sway_assert(con->type == C_VIEW, "Expected a view")) {
+		return;
+	}
+	if (!sway_assert(container_is_floating(con),
+				"Expected a floating view")) {
+		return;
+	}
+	struct sway_view *view = con->sway_view;
+	size_t border_width = view->border_thickness * (view->border != B_NONE);
+	size_t top =
+		view->border == B_NORMAL ? container_titlebar_height() : border_width;
+
+	con->x = view->x - border_width;
+	con->y = view->y - top;
+	con->width = view->width + border_width * 2;
+	con->height = top + view->height + border_width;
+}
+
+bool container_is_floating(struct sway_container *container) {
+	struct sway_container *workspace = container_parent(container, C_WORKSPACE);
+	if (!workspace) {
+		return false;
+	}
+	return container->parent == workspace->sway_workspace->floating;
+}

sway/tree/layout.c

@@ -45,20 +45,14 @@ void layout_init(void) {
 }
 
 static int index_child(const struct sway_container *child) {
-	// TODO handle floating
 	struct sway_container *parent = child->parent;
-	int i, len;
-	len = parent->children->length;
-	for (i = 0; i < len; ++i) {
+	for (int i = 0; i < parent->children->length; ++i) {
 		if (parent->children->items[i] == child) {
-			break;
+			return i;
 		}
 	}
-
-	if (!sway_assert(i < len, "Stray container")) {
-		return -1;
-	}
-	return i;
+	// This happens if the child is a floating container
+	return -1;
 }
 
 static void container_handle_fullscreen_reparent(struct sway_container *viewcon,
@@ -160,6 +154,10 @@ void container_move_to(struct sway_container *container,
 			|| container_has_ancestor(container, destination)) {
 		return;
 	}
+	if (container_is_floating(container)) {
+		// TODO
+		return;
+	}
 	struct sway_container *old_parent = container_remove_child(container);
 	container->width = container->height = 0;
 	container->saved_width = container->saved_height = 0;
@@ -172,8 +170,9 @@ void container_move_to(struct sway_container *container,
 	}
 	wl_signal_emit(&container->events.reparent, old_parent);
 	if (container->type == C_WORKSPACE) {
-		struct sway_seat *seat = input_manager_get_default_seat(
-				input_manager);
+		// If moving a workspace to a new output, maybe create a new workspace
+		// on the previous output
+		struct sway_seat *seat = input_manager_get_default_seat(input_manager);
 		if (old_parent->children->length == 0) {
 			char *ws_name = workspace_next_name(old_parent->name);
 			struct sway_container *ws =
@@ -681,26 +680,6 @@ static struct sway_container *get_swayc_in_output_direction(
 	return ws;
 }
 
-static void get_layout_center_position(struct sway_container *container,
-		int *x, int *y) {
-	// FIXME view coords are inconsistently referred to in layout/output systems
-	if (container->type == C_OUTPUT) {
-		*x = container->x + container->width/2;
-		*y = container->y + container->height/2;
-	} else {
-		struct sway_container *output = container_parent(container, C_OUTPUT);
-		if (container->type == C_WORKSPACE) {
-			// Workspace coordinates are actually wrong/arbitrary, but should
-			// be same as output.
-			*x = output->x;
-			*y = output->y;
-		} else {
-			*x = output->x + container->x;
-			*y = output->y + container->y;
-		}
-	}
-}
-
 static struct sway_container *sway_output_from_wlr(struct wlr_output *output) {
 	if (output == NULL) {
 		return NULL;
@@ -719,6 +698,10 @@ struct sway_container *container_get_in_direction(
 		enum movement_direction dir) {
 	struct sway_container *parent = container->parent;
 
+	if (container_is_floating(container)) {
+		return NULL;
+	}
+
 	if (container->type == C_VIEW && container->sway_view->is_fullscreen) {
 		if (dir == MOVE_PARENT || dir == MOVE_CHILD) {
 			return NULL;
@@ -743,14 +726,17 @@ struct sway_container *container_get_in_direction(
 		bool can_move = false;
 		int desired;
 		int idx = index_child(container);
+		if (idx == -1) {
+			return NULL;
+		}
 		if (parent->type == C_ROOT) {
 			enum wlr_direction wlr_dir = 0;
 			if (!sway_assert(sway_dir_to_wlr(dir, &wlr_dir),
 						"got invalid direction: %d", dir)) {
 				return NULL;
 			}
-			int lx, ly;
-			get_layout_center_position(container, &lx, &ly);
+			int lx = container->x + container->width / 2;
+			int ly = container->y + container->height / 2;
 			struct wlr_output_layout *layout =
 				root_container.sway_root->output_layout;
 			struct wlr_output *wlr_adjacent =

sway/tree/view.c

@@ -119,13 +119,28 @@ const char *view_get_shell(struct sway_view *view) {
 	return "unknown";
 }
 
-void view_configure(struct sway_view *view, double ox, double oy, int width,
+void view_configure(struct sway_view *view, double lx, double ly, int width,
 		int height) {
 	if (view->impl->configure) {
-		view->impl->configure(view, ox, oy, width, height);
+		view->impl->configure(view, lx, ly, width, height);
 	}
 }
 
+static void view_autoconfigure_floating(struct sway_view *view) {
+	struct sway_container *ws = container_parent(view->swayc, C_WORKSPACE);
+	int max_width = ws->width * 0.6666;
+	int max_height = ws->height * 0.6666;
+	int width =
+		view->natural_width > max_width ? max_width : view->natural_width;
+	int height =
+		view->natural_height > max_height ? max_height : view->natural_height;
+	int lx = ws->x + (ws->width - width) / 2;
+	int ly = ws->y + (ws->height - height) / 2;
+
+	view->border_left = view->border_right = view->border_bottom = true;
+	view_configure(view, lx, ly, width, height);
+}
+
 void view_autoconfigure(struct sway_view *view) {
 	if (!sway_assert(view->swayc,
 				"Called view_autoconfigure() on a view without a swayc")) {
@@ -135,8 +150,12 @@ void view_autoconfigure(struct sway_view *view) {
 	struct sway_container *output = container_parent(view->swayc, C_OUTPUT);
 
 	if (view->is_fullscreen) {
-		view_configure(view, 0, 0, output->width, output->height);
-		view->x = view->y = 0;
+		view_configure(view, output->x, output->y, output->width, output->height);
+		return;
+	}
+
+	if (container_is_floating(view->swayc)) {
+		view_autoconfigure_floating(view);
 		return;
 	}
 
@@ -158,21 +177,19 @@ void view_autoconfigure(struct sway_view *view) {
 
 	view->border_top = view->border_bottom = true;
 	view->border_left = view->border_right = true;
-	if (view->swayc->layout != L_FLOATING) {
-		if (config->hide_edge_borders == E_BOTH
-				|| config->hide_edge_borders == E_VERTICAL
-				|| (config->hide_edge_borders == E_SMART && !other_views)) {
-			view->border_left = view->swayc->x != ws->x;
-			int right_x = view->swayc->x + view->swayc->width;
-			view->border_right = right_x != ws->x + ws->width;
-		}
-		if (config->hide_edge_borders == E_BOTH
-				|| config->hide_edge_borders == E_HORIZONTAL
-				|| (config->hide_edge_borders == E_SMART && !other_views)) {
-			view->border_top = view->swayc->y != ws->y;
-			int bottom_y = view->swayc->y + view->swayc->height;
-			view->border_bottom = bottom_y != ws->y + ws->height;
-		}
+	if (config->hide_edge_borders == E_BOTH
+			|| config->hide_edge_borders == E_VERTICAL
+			|| (config->hide_edge_borders == E_SMART && !other_views)) {
+		view->border_left = view->swayc->x != ws->x;
+		int right_x = view->swayc->x + view->swayc->width;
+		view->border_right = right_x != ws->x + ws->width;
+	}
+	if (config->hide_edge_borders == E_BOTH
+			|| config->hide_edge_borders == E_HORIZONTAL
+			|| (config->hide_edge_borders == E_SMART && !other_views)) {
+		view->border_top = view->swayc->y != ws->y;
+		int bottom_y = view->swayc->y + view->swayc->height;
+		view->border_bottom = bottom_y != ws->y + ws->height;
 	}
 
 	double x, y, width, height;
@@ -184,11 +201,11 @@ void view_autoconfigure(struct sway_view *view) {
 	// disable any top border because we'll always have the title bar.
 	if (view->swayc->parent->layout == L_TABBED) {
 		y_offset = container_titlebar_height();
-		view->border_top = 0;
+		view->border_top = false;
 	} else if (view->swayc->parent->layout == L_STACKED) {
 		y_offset = container_titlebar_height()
 			* view->swayc->parent->children->length;
-		view->border_top = 0;
+		view->border_top = false;
 	}
 
 	switch (view->border) {
@@ -257,6 +274,12 @@ void view_set_fullscreen_raw(struct sway_view *view, bool fullscreen) {
 			view_set_fullscreen(workspace->sway_workspace->fullscreen, false);
 		}
 		workspace->sway_workspace->fullscreen = view;
+		view->saved_x = view->x;
+		view->saved_y = view->y;
+		view->saved_width = view->width;
+		view->saved_height = view->height;
+		view->swayc->saved_x = view->swayc->x;
+		view->swayc->saved_y = view->swayc->y;
 		view->swayc->saved_width = view->swayc->width;
 		view->swayc->saved_height = view->swayc->height;
 
@@ -277,8 +300,14 @@ void view_set_fullscreen_raw(struct sway_view *view, bool fullscreen) {
 		}
 	} else {
 		workspace->sway_workspace->fullscreen = NULL;
-		view->swayc->width = view->swayc->saved_width;
-		view->swayc->height = view->swayc->saved_height;
+		if (container_is_floating(view->swayc)) {
+			view_configure(view, view->saved_x, view->saved_y,
+					view->saved_width, view->saved_height);
+		} else {
+			view->swayc->width = view->swayc->saved_width;
+			view->swayc->height = view->swayc->saved_height;
+			view_autoconfigure(view);
+		}
 	}
 }
 
@@ -452,6 +481,11 @@ void view_map(struct sway_view *view, struct wlr_surface *wlr_surface) {
 			// TODO: CT_ASSIGN_OUTPUT
 		}
 	}
+	// If we're about to launch the view into the floating container, then
+	// launch it as a tiled view in the root of the workspace instead.
+	if (container_is_floating(focus)) {
+		focus = focus->parent->parent;
+	}
 	free(criterias);
 	cont = container_view_create(focus, view);
 
@@ -468,7 +502,12 @@ void view_map(struct sway_view *view, struct wlr_surface *wlr_surface) {
 	wl_signal_add(&view->swayc->events.reparent, &view->container_reparent);
 	view->container_reparent.notify = view_handle_container_reparent;
 
-	arrange_children_of(cont->parent);
+	if (view->impl->wants_floating && view->impl->wants_floating(view)) {
+		container_set_floating(view->swayc, true);
+	} else {
+		arrange_children_of(cont->parent);
+	}
+
 	input_manager_set_focus(input_manager, cont);
 	if (workspace) {
 		workspace_switch(workspace);
@@ -516,16 +555,16 @@ void view_unmap(struct sway_view *view) {
 	}
 }
 
-void view_update_position(struct sway_view *view, double ox, double oy) {
-	if (view->swayc->x == ox && view->swayc->y == oy) {
+void view_update_position(struct sway_view *view, double lx, double ly) {
+	if (view->x == lx && view->y == ly) {
 		return;
 	}
-
-	// TODO: Only allow this if the view is floating (this function will only be
-	// called in response to wayland clients wanting to reposition themselves).
 	container_damage_whole(view->swayc);
-	view->swayc->x = ox;
-	view->swayc->y = oy;
+	view->x = lx;
+	view->y = ly;
+	if (container_is_floating(view->swayc)) {
+		container_set_geometry_from_floating_view(view->swayc);
+	}
 	container_damage_whole(view->swayc);
 }
 
@@ -533,15 +572,15 @@ void view_update_size(struct sway_view *view, int width, int height) {
 	if (view->width == width && view->height == height) {
 		return;
 	}
-
 	container_damage_whole(view->swayc);
-	// Should we update the swayc width/height here too?
 	view->width = width;
 	view->height = height;
+	if (container_is_floating(view->swayc)) {
+		container_set_geometry_from_floating_view(view->swayc);
+	}
 	container_damage_whole(view->swayc);
 }
 
-
 static void view_subsurface_create(struct sway_view *view,
 		struct wlr_subsurface *subsurface) {
 	struct sway_view_child *child = calloc(1, sizeof(struct sway_view_child));
@@ -888,6 +927,19 @@ bool view_is_visible(struct sway_view *view) {
 	if (!view->swayc) {
 		return false;
 	}
+	struct sway_container *workspace =
+		container_parent(view->swayc, C_WORKSPACE);
+	// Determine if view is nested inside a floating container which is sticky.
+	// A simple floating view will have this ancestry:
+	// C_VIEW -> floating -> workspace
+	// A more complex ancestry could be:
+	// C_VIEW -> C_CONTAINER (tabbed) -> floating -> workspace
+	struct sway_container *floater = view->swayc;
+	while (floater->parent->type != C_WORKSPACE
+			&& floater->parent->parent->type != C_WORKSPACE) {
+		floater = floater->parent;
+	}
+	bool is_sticky = container_is_floating(floater) && floater->is_sticky;
 	// Check view isn't in a tabbed or stacked container on an inactive tab
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
 	struct sway_container *container = view->swayc;
@@ -901,10 +953,12 @@ bool view_is_visible(struct sway_view *view) {
 		container = container->parent;
 	}
 	// Check view isn't hidden by another fullscreen view
-	struct sway_container *workspace = container;
 	if (workspace->sway_workspace->fullscreen && !view->is_fullscreen) {
 		return false;
 	}
 	// Check the workspace is visible
-	return workspace_is_visible(workspace);
+	if (!is_sticky) {
+		return workspace_is_visible(workspace);
+	}
+	return true;
 }

sway/tree/workspace.c

@@ -12,6 +12,7 @@
 #include "sway/tree/arrange.h"
 #include "sway/tree/container.h"
 #include "sway/tree/workspace.h"
+#include "list.h"
 #include "log.h"
 #include "util.h"
 
@@ -64,6 +65,9 @@ struct sway_container *workspace_create(struct sway_container *output,
 		return NULL;
 	}
 	swayws->swayc = workspace;
+	swayws->floating = container_create(C_CONTAINER);
+	swayws->floating->parent = swayws->swayc;
+	swayws->floating->layout = L_FLOATING;
 	workspace->sway_workspace = swayws;
 
 	container_add_child(output, workspace);
@@ -383,7 +387,21 @@ bool workspace_switch(struct sway_container *workspace) {
 		strcpy(prev_workspace_name, active_ws->name);
 	}
 
-	// TODO: Deal with sticky containers
+	// Move sticky containers to new workspace
+	struct sway_container *next_output = workspace->parent;
+	struct sway_container *next_output_prev_ws =
+		seat_get_active_child(seat, next_output);
+	struct sway_container *floating =
+		next_output_prev_ws->sway_workspace->floating;
+	bool has_sticky = false;
+	for (int i = 0; i < floating->children->length; ++i) {
+		struct sway_container *floater = floating->children->items[i];
+		if (floater->is_sticky) {
+			has_sticky = true;
+			container_remove_child(floater);
+			container_add_child(workspace->sway_workspace->floating, floater);
+		}
+	}
 
 	wlr_log(L_DEBUG, "Switching to workspace %p:%s",
 		workspace, workspace->name);
@@ -391,6 +409,16 @@ bool workspace_switch(struct sway_container *workspace) {
 	if (next == NULL) {
 		next = workspace;
 	}
+	if (has_sticky) {
+		// If there's a sticky container, we might be setting focus to the same
+		// container that's already focused, so seat_set_focus is effectively a
+		// no op. We therefore need to send the IPC event and clean up the old
+		// workspace here.
+		ipc_event_workspace(active_ws, workspace, "focus");
+		if (!workspace_is_visible(active_ws) && workspace_is_empty(active_ws)) {
+			container_destroy(active_ws);
+		}
+	}
 	seat_set_focus(seat, next);
 	struct sway_container *output = container_parent(workspace, C_OUTPUT);
 	arrange_output(output);
@@ -406,3 +434,21 @@ bool workspace_is_visible(struct sway_container *ws) {
 	}
 	return focus == ws;
 }
+
+bool workspace_is_empty(struct sway_container *ws) {
+	if (!sway_assert(ws->type == C_WORKSPACE, "Expected a workspace")) {
+		return false;
+	}
+	if (ws->children->length) {
+		return false;
+	}
+	// Sticky views are not considered to be part of this workspace
+	struct sway_container *floating = ws->sway_workspace->floating;
+	for (int i = 0; i < floating->children->length; ++i) {
+		struct sway_container *floater = floating->children->items[i];
+		if (!floater->is_sticky) {
+			return false;
+		}
+	}
+	return true;
+}