Add inhibit_fullscreen command

inhibit_fullscreen allows a container to service but ignore fullscreen
requests from clients. This allows clients to change to fullscreen mode
without changing dimensions of its container.

include/sway/commands.h

@@ -135,6 +135,7 @@ sway_cmd cmd_fullscreen;
 sway_cmd cmd_gaps;
 sway_cmd cmd_hide_edge_borders;
 sway_cmd cmd_include;
+sway_cmd cmd_inhibit_fullscreen;
 sway_cmd cmd_inhibit_idle;
 sway_cmd cmd_input;
 sway_cmd cmd_seat;

include/sway/tree/container.h

@@ -108,6 +108,9 @@ struct sway_container {
 
 	enum sway_fullscreen_mode fullscreen_mode;
 
+	bool inhibit_fullscreen;
+	bool is_fullscreen;
+
 	enum sway_container_border border;
 
 	// Used when the view changes to CSD unexpectedly. This will be a non-B_CSD
@@ -269,6 +272,8 @@ void container_end_mouse_operation(struct sway_container *container);
 void container_set_fullscreen(struct sway_container *con,
 		enum sway_fullscreen_mode mode);
 
+void container_request_fullscreen(struct sway_container *con, bool enable);
+
 /**
  * Convenience function.
  */

sway/commands.c

@@ -114,6 +114,7 @@ static struct cmd_handler command_handlers[] = {
 	{ "exit", cmd_exit },
 	{ "floating", cmd_floating },
 	{ "fullscreen", cmd_fullscreen },
+	{ "inhibit_fullscreen", cmd_inhibit_fullscreen },
 	{ "inhibit_idle", cmd_inhibit_idle },
 	{ "kill", cmd_kill },
 	{ "layout", cmd_layout },

sway/commands/inhibit_fullscreen.c

@@ -0,0 +1,45 @@
+#include <strings.h>
+#include "log.h"
+#include "sway/commands.h"
+#include "sway/config.h"
+#include "sway/tree/arrange.h"
+#include "sway/tree/container.h"
+#include "sway/tree/view.h"
+#include "sway/tree/workspace.h"
+#include "util.h"
+
+// inhibit_fullscreen [toggle|enable|disable]
+struct cmd_results *cmd_inhibit_fullscreen(int argc, char **argv) {
+	struct cmd_results *error = NULL;
+	if ((error = checkarg(argc, "inhibit_fullscreen", EXPECTED_EQUAL_TO, 1))) {
+		return error;
+	}
+	if (!root->outputs->length) {
+		return cmd_results_new(CMD_FAILURE,
+				"Can't run this command while there's no outputs connected.");
+	}
+	struct sway_node *node = config->handler_context.node;
+	struct sway_container *container = config->handler_context.container;
+	struct sway_workspace *workspace = config->handler_context.workspace;
+	if (node->type == N_WORKSPACE && workspace->tiling->length == 0) {
+		return cmd_results_new(CMD_FAILURE,
+				"Can't fullscreen an empty workspace");
+	}
+
+	// If in the scratchpad, operate on the highest container
+	if (container && !container->workspace) {
+		while (container->parent) {
+			container = container->parent;
+		}
+	}
+
+	bool enable = false;
+	if (strcasecmp(argv[0], "toggle") == 0) {
+		enable = !container->inhibit_fullscreen;
+	} else {
+		enable = strcasecmp(argv[0], "enable") == 0;
+	}
+
+	container->inhibit_fullscreen = enable;
+	return cmd_results_new(CMD_SUCCESS, NULL);
+}

sway/desktop/xdg_shell.c

@@ -363,7 +363,7 @@ static void handle_request_fullscreen(struct wl_listener *listener, void *data)
 		}
 	}
 
-	container_set_fullscreen(view->container, e->fullscreen);
+	container_request_fullscreen(view->container, e->fullscreen);
 
 	arrange_root();
 	transaction_commit_dirty();

sway/meson.build

@@ -65,6 +65,7 @@ sway_sources = files(
 	'commands/fullscreen.c',
 	'commands/gaps.c',
 	'commands/hide_edge_borders.c',
+	'commands/inhibit_fullscreen.c',
 	'commands/inhibit_idle.c',
 	'commands/kill.c',
 	'commands/mark.c',

sway/sway.5.scd

@@ -161,6 +161,12 @@ set|plus|minus <amount>
 	_right_, _bottom_, and _left_ or per direction with _horizontal_ and
 	_vertical_.
 
+*inhibit_fullscreen* toggle|enable|disable
+	Set/unset fullscreen inhibitor for for the container. If enabled, client
+	requests to fullscreen the container will be ignored. This can be used to
+	have clients transition to their fullscreen interface, while still
+	constraining them to their container.
+
 *inhibit_idle* focus|fullscreen|open|none|visible
 	Set/unset an idle inhibitor for the view. _focus_ will inhibit idle when
 	the view is focused by any seat. _fullscreen_ will inhibit idle when the

sway/tree/container.c

@@ -990,9 +990,11 @@ static void container_fullscreen_workspace(struct sway_container *con) {
 				"Expected a non-fullscreen container")) {
 		return;
 	}
-	bool enable = true;
-	set_fullscreen_iterator(con, &enable);
-	container_for_each_child(con, set_fullscreen_iterator, &enable);
+	if (!con->inhibit_fullscreen) {
+		bool enable = true;
+		set_fullscreen_iterator(con, &enable);
+		container_for_each_child(con, set_fullscreen_iterator, &enable);
+	}
 
 	con->saved_x = con->x;
 	con->saved_y = con->y;
@@ -1017,6 +1019,7 @@ static void container_fullscreen_workspace(struct sway_container *con) {
 	}
 
 	con->fullscreen_mode = FULLSCREEN_WORKSPACE;
+	con->is_fullscreen = true;
 	container_end_mouse_operation(con);
 	ipc_event_window(con, "fullscreen_mode");
 }
@@ -1026,9 +1029,11 @@ static void container_fullscreen_global(struct sway_container *con) {
 				"Expected a non-fullscreen container")) {
 		return;
 	}
-	bool enable = true;
-	set_fullscreen_iterator(con, &enable);
-	container_for_each_child(con, set_fullscreen_iterator, &enable);
+	if (!con->inhibit_fullscreen) {
+		bool enable = true;
+		set_fullscreen_iterator(con, &enable);
+		container_for_each_child(con, set_fullscreen_iterator, &enable);
+	}
 
 	root->fullscreen_global = con;
 	con->saved_x = con->x;
@@ -1045,6 +1050,7 @@ static void container_fullscreen_global(struct sway_container *con) {
 	}
 
 	con->fullscreen_mode = FULLSCREEN_GLOBAL;
+	con->is_fullscreen = true;
 	container_end_mouse_operation(con);
 	ipc_event_window(con, "fullscreen_mode");
 }
@@ -1054,9 +1060,11 @@ void container_fullscreen_disable(struct sway_container *con) {
 				"Expected a fullscreen container")) {
 		return;
 	}
-	bool enable = false;
-	set_fullscreen_iterator(con, &enable);
-	container_for_each_child(con, set_fullscreen_iterator, &enable);
+	if (!con->inhibit_fullscreen) {
+		bool enable = false;
+		set_fullscreen_iterator(con, &enable);
+		container_for_each_child(con, set_fullscreen_iterator, &enable);
+	}
 
 	if (container_is_floating(con)) {
 		con->x = con->saved_x;
@@ -1088,6 +1096,7 @@ void container_fullscreen_disable(struct sway_container *con) {
 	}
 
 	con->fullscreen_mode = FULLSCREEN_NONE;
+	con->is_fullscreen = false;
 	container_end_mouse_operation(con);
 	ipc_event_window(con, "fullscreen_mode");
 
@@ -1134,6 +1143,20 @@ void container_set_fullscreen(struct sway_container *con,
 	}
 }
 
+void container_request_fullscreen(struct sway_container *con, bool enable) {
+	if (con->inhibit_fullscreen) {
+		set_fullscreen_iterator(con, &enable);
+		container_for_each_child(con, set_fullscreen_iterator, &enable);
+		if (con->workspace) {
+			arrange_workspace(con->workspace);
+		}
+		con->is_fullscreen = enable;
+		return;
+	}
+
+	container_set_fullscreen(con, enable);
+}
+
 struct sway_container *container_toplevel_ancestor(
 		struct sway_container *container) {
 	while (container->parent) {