xdg-shell: split into multiple files

include/types/wlr_xdg_shell.h

@@ -0,0 +1,45 @@
+#ifndef TYPES_WLR_XDG_SHELL_H
+#define TYPES_WLR_XDG_SHELL_H
+
+#include <wayland-server.h>
+#include <wlr/types/wlr_xdg_shell.h>
+#include "xdg-shell-protocol.h"
+
+struct wlr_xdg_positioner_resource {
+	struct wl_resource *resource;
+	struct wlr_xdg_positioner attrs;
+};
+
+#define XDG_TOPLEVEL_ROLE "xdg_toplevel"
+#define XDG_POPUP_ROLE "xdg_popup"
+
+uint32_t schedule_xdg_surface_configure(struct wlr_xdg_surface *surface);
+struct wlr_xdg_surface *create_xdg_surface(
+	struct wlr_xdg_client *client, struct wlr_surface *surface,
+	uint32_t id);
+void unmap_xdg_surface(struct wlr_xdg_surface *surface);
+void destroy_xdg_surface(struct wlr_xdg_surface *surface);
+
+void create_xdg_positioner(struct wlr_xdg_client *client, uint32_t id);
+struct wlr_xdg_positioner_resource *get_xdg_positioner_from_resource(
+	struct wl_resource *resource);
+
+void create_xdg_popup(struct wlr_xdg_surface *xdg_surface,
+	struct wlr_xdg_surface *parent,
+	struct wlr_xdg_positioner_resource *positioner, int32_t id);
+void handle_xdg_surface_popup_committed(struct wlr_xdg_surface *surface);
+struct wlr_xdg_popup_grab *get_xdg_shell_popup_grab_from_seat(
+	struct wlr_xdg_shell *shell, struct wlr_seat *seat);
+void destroy_xdg_popup(struct wlr_xdg_surface *surface);
+
+void create_xdg_toplevel(struct wlr_xdg_surface *xdg_surface,
+	uint32_t id);
+void handle_xdg_surface_toplevel_committed(struct wlr_xdg_surface *surface);
+void send_xdg_toplevel_configure(struct wlr_xdg_surface *surface,
+	struct wlr_xdg_surface_configure *configure);
+void handle_xdg_toplevel_ack_configure(struct wlr_xdg_surface *surface,
+	struct wlr_xdg_surface_configure *configure);
+bool compare_xdg_surface_toplevel_state(struct wlr_xdg_toplevel *state);
+void destroy_xdg_toplevel(struct wlr_xdg_surface *surface);
+
+#endif

types/meson.build

@@ -9,6 +9,11 @@ lib_wlr_types = static_library(
 		'seat/wlr_seat_pointer.c',
 		'seat/wlr_seat_touch.c',
 		'seat/wlr_seat.c',
+		'xdg_shell/wlr_xdg_popup.c',
+		'xdg_shell/wlr_xdg_positioner.c',
+		'xdg_shell/wlr_xdg_shell.c',
+		'xdg_shell/wlr_xdg_surface.c',
+		'xdg_shell/wlr_xdg_toplevel.c',
 		'xdg_shell_v6/wlr_xdg_popup_v6.c',
 		'xdg_shell_v6/wlr_xdg_positioner_v6.c',
 		'xdg_shell_v6/wlr_xdg_shell_v6.c',
@@ -42,7 +47,6 @@ lib_wlr_types = static_library(
 		'wlr_wl_shell.c',
 		'wlr_xcursor_manager.c',
 		'wlr_xdg_output.c',
-		'wlr_xdg_shell.c',
 	),
 	include_directories: wlr_inc,
 	dependencies: [pixman, xkbcommon, wayland_server, wlr_protos],

types/wlr_layer_shell.c

@@ -491,8 +491,8 @@ static void xdg_surface_for_each_surface(struct wlr_xdg_surface *surface,
 			continue;
 		}
 
-		double popup_sx, popup_sy;
+		double popup_sx = popup_state->geometry.x - popup_state->base->geometry.x;
-		wlr_xdg_surface_popup_get_position(popup, &popup_sx, &popup_sy);
+		double popup_sy = popup_state->geometry.y - popup_state->base->geometry.y;
 
 		xdg_surface_for_each_surface(popup,
 			x + popup_sx,

types/xdg_shell/wlr_xdg_popup.c

@@ -0,0 +1,490 @@
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+#include "types/wlr_xdg_shell.h"
+#include "util/signal.h"
+
+static void xdg_pointer_grab_end(struct wlr_seat_pointer_grab *grab) {
+	struct wlr_xdg_popup_grab *popup_grab = grab->data;
+
+	struct wlr_xdg_popup *popup, *tmp;
+	wl_list_for_each_safe(popup, tmp, &popup_grab->popups, grab_link) {
+		xdg_popup_send_popup_done(popup->resource);
+	}
+
+	wlr_seat_pointer_end_grab(grab->seat);
+}
+
+static void xdg_pointer_grab_enter(struct wlr_seat_pointer_grab *grab,
+		struct wlr_surface *surface, double sx, double sy) {
+	struct wlr_xdg_popup_grab *popup_grab = grab->data;
+	if (wl_resource_get_client(surface->resource) == popup_grab->client) {
+		wlr_seat_pointer_enter(grab->seat, surface, sx, sy);
+	} else {
+		wlr_seat_pointer_clear_focus(grab->seat);
+	}
+}
+
+static void xdg_pointer_grab_motion(struct wlr_seat_pointer_grab *grab,
+		uint32_t time, double sx, double sy) {
+	wlr_seat_pointer_send_motion(grab->seat, time, sx, sy);
+}
+
+static uint32_t xdg_pointer_grab_button(struct wlr_seat_pointer_grab *grab,
+		uint32_t time, uint32_t button, uint32_t state) {
+	uint32_t serial =
+		wlr_seat_pointer_send_button(grab->seat, time, button, state);
+	if (serial) {
+		return serial;
+	} else {
+		xdg_pointer_grab_end(grab);
+		return 0;
+	}
+}
+
+static void xdg_pointer_grab_axis(struct wlr_seat_pointer_grab *grab,
+		uint32_t time, enum wlr_axis_orientation orientation, double value,
+		int32_t value_discrete, enum wlr_axis_source source) {
+	wlr_seat_pointer_send_axis(grab->seat, time, orientation, value,
+		value_discrete, source);
+}
+
+static void xdg_pointer_grab_cancel(struct wlr_seat_pointer_grab *grab) {
+	xdg_pointer_grab_end(grab);
+}
+
+static const struct wlr_pointer_grab_interface xdg_pointer_grab_impl = {
+	.enter = xdg_pointer_grab_enter,
+	.motion = xdg_pointer_grab_motion,
+	.button = xdg_pointer_grab_button,
+	.cancel = xdg_pointer_grab_cancel,
+	.axis = xdg_pointer_grab_axis,
+};
+
+static void xdg_keyboard_grab_enter(struct wlr_seat_keyboard_grab *grab,
+		struct wlr_surface *surface, uint32_t keycodes[], size_t num_keycodes,
+		struct wlr_keyboard_modifiers *modifiers) {
+	// keyboard focus should remain on the popup
+}
+
+static void xdg_keyboard_grab_key(struct wlr_seat_keyboard_grab *grab, uint32_t time,
+		uint32_t key, uint32_t state) {
+	wlr_seat_keyboard_send_key(grab->seat, time, key, state);
+}
+
+static void xdg_keyboard_grab_modifiers(struct wlr_seat_keyboard_grab *grab,
+		struct wlr_keyboard_modifiers *modifiers) {
+	wlr_seat_keyboard_send_modifiers(grab->seat, modifiers);
+}
+
+static void xdg_keyboard_grab_cancel(struct wlr_seat_keyboard_grab *grab) {
+	wlr_seat_keyboard_end_grab(grab->seat);
+}
+
+static const struct wlr_keyboard_grab_interface xdg_keyboard_grab_impl = {
+	.enter = xdg_keyboard_grab_enter,
+	.key = xdg_keyboard_grab_key,
+	.modifiers = xdg_keyboard_grab_modifiers,
+	.cancel = xdg_keyboard_grab_cancel,
+};
+
+static void xdg_popup_grab_handle_seat_destroy(
+		struct wl_listener *listener, void *data) {
+	struct wlr_xdg_popup_grab *xdg_grab =
+		wl_container_of(listener, xdg_grab, seat_destroy);
+
+	wl_list_remove(&xdg_grab->seat_destroy.link);
+
+	struct wlr_xdg_popup *popup, *next;
+	wl_list_for_each_safe(popup, next, &xdg_grab->popups, grab_link) {
+		destroy_xdg_surface(popup->base);
+	}
+
+	wl_list_remove(&xdg_grab->link);
+	free(xdg_grab);
+}
+
+struct wlr_xdg_popup_grab *get_xdg_shell_popup_grab_from_seat(
+		struct wlr_xdg_shell *shell, struct wlr_seat *seat) {
+	struct wlr_xdg_popup_grab *xdg_grab;
+	wl_list_for_each(xdg_grab, &shell->popup_grabs, link) {
+		if (xdg_grab->seat == seat) {
+			return xdg_grab;
+		}
+	}
+
+	xdg_grab = calloc(1, sizeof(struct wlr_xdg_popup_grab));
+	if (!xdg_grab) {
+		return NULL;
+	}
+
+	xdg_grab->pointer_grab.data = xdg_grab;
+	xdg_grab->pointer_grab.interface = &xdg_pointer_grab_impl;
+	xdg_grab->keyboard_grab.data = xdg_grab;
+	xdg_grab->keyboard_grab.interface = &xdg_keyboard_grab_impl;
+
+	wl_list_init(&xdg_grab->popups);
+
+	wl_list_insert(&shell->popup_grabs, &xdg_grab->link);
+	xdg_grab->seat = seat;
+
+	xdg_grab->seat_destroy.notify = xdg_popup_grab_handle_seat_destroy;
+	wl_signal_add(&seat->events.destroy, &xdg_grab->seat_destroy);
+
+	return xdg_grab;
+}
+
+
+static const struct xdg_popup_interface xdg_popup_implementation;
+
+struct wlr_xdg_surface *wlr_xdg_surface_from_popup_resource(
+		struct wl_resource *resource) {
+	assert(wl_resource_instance_of(resource, &xdg_popup_interface,
+		&xdg_popup_implementation));
+	return wl_resource_get_user_data(resource);
+}
+
+static void xdg_popup_handle_grab(struct wl_client *client,
+		struct wl_resource *resource, struct wl_resource *seat_resource,
+		uint32_t serial) {
+	struct wlr_xdg_surface *surface =
+		wlr_xdg_surface_from_popup_resource(resource);
+	struct wlr_seat_client *seat_client =
+		wlr_seat_client_from_resource(seat_resource);
+
+	if (surface->popup->committed) {
+		wl_resource_post_error(surface->popup->resource,
+			XDG_POPUP_ERROR_INVALID_GRAB,
+			"xdg_popup is already mapped");
+		return;
+	}
+
+	struct wlr_xdg_popup_grab *popup_grab = get_xdg_shell_popup_grab_from_seat(
+		surface->client->shell, seat_client->seat);
+
+	if (!wl_list_empty(&surface->popups)) {
+		wl_resource_post_error(surface->client->resource,
+			XDG_WM_BASE_ERROR_NOT_THE_TOPMOST_POPUP,
+			"xdg_popup was not created on the topmost popup");
+		return;
+	}
+
+	popup_grab->client = surface->client->client;
+	surface->popup->seat = seat_client->seat;
+
+	wl_list_insert(&popup_grab->popups, &surface->popup->grab_link);
+
+	wlr_seat_pointer_start_grab(seat_client->seat,
+		&popup_grab->pointer_grab);
+	wlr_seat_keyboard_start_grab(seat_client->seat,
+		&popup_grab->keyboard_grab);
+}
+
+static void xdg_popup_handle_destroy(struct wl_client *client,
+		struct wl_resource *resource) {
+	struct wlr_xdg_surface *surface =
+		wlr_xdg_surface_from_popup_resource(resource);
+
+	if (!wl_list_empty(&surface->popups)) {
+		wl_resource_post_error(surface->client->resource,
+			XDG_WM_BASE_ERROR_NOT_THE_TOPMOST_POPUP,
+			"xdg_popup was destroyed while it was not the topmost popup");
+		return;
+	}
+
+	wl_resource_destroy(resource);
+}
+
+static const struct xdg_popup_interface xdg_popup_implementation = {
+	.destroy = xdg_popup_handle_destroy,
+	.grab = xdg_popup_handle_grab,
+};
+
+static void xdg_popup_handle_resource_destroy(struct wl_resource *resource) {
+	struct wlr_xdg_surface *surface =
+		wlr_xdg_surface_from_popup_resource(resource);
+	if (surface != NULL) {
+		destroy_xdg_popup(surface);
+	}
+}
+
+void create_xdg_popup(struct wlr_xdg_surface *xdg_surface,
+		struct wlr_xdg_surface *parent,
+		struct wlr_xdg_positioner_resource *positioner, int32_t id) {
+	if (positioner->attrs.size.width == 0 ||
+			positioner->attrs.anchor_rect.width == 0) {
+		wl_resource_post_error(xdg_surface->resource,
+			XDG_WM_BASE_ERROR_INVALID_POSITIONER,
+			"positioner object is not complete");
+		return;
+	}
+
+	if (wlr_surface_set_role(xdg_surface->surface, XDG_POPUP_ROLE,
+			xdg_surface->resource, XDG_WM_BASE_ERROR_ROLE)) {
+		return;
+	}
+
+	xdg_surface->popup = calloc(1, sizeof(struct wlr_xdg_popup));
+	if (!xdg_surface->popup) {
+		wl_resource_post_no_memory(xdg_surface->resource);
+		return;
+	}
+
+	xdg_surface->popup->resource = wl_resource_create(
+		xdg_surface->client->client, &xdg_popup_interface,
+		wl_resource_get_version(xdg_surface->resource), id);
+	if (xdg_surface->popup->resource == NULL) {
+		free(xdg_surface->popup);
+		wl_resource_post_no_memory(xdg_surface->resource);
+		return;
+	}
+	wl_resource_set_implementation(xdg_surface->popup->resource,
+		&xdg_popup_implementation, xdg_surface,
+		xdg_popup_handle_resource_destroy);
+
+	xdg_surface->role = WLR_XDG_SURFACE_ROLE_POPUP;
+	xdg_surface->popup->base = xdg_surface;
+
+	// positioner properties
+	memcpy(&xdg_surface->popup->positioner, &positioner->attrs,
+		sizeof(struct wlr_xdg_positioner));
+	xdg_surface->popup->geometry =
+		wlr_xdg_positioner_get_geometry(&positioner->attrs);
+
+	if (parent) {
+		xdg_surface->popup->parent = parent->surface;
+		wl_list_insert(&parent->popups, &xdg_surface->popup->link);
+		wlr_signal_emit_safe(&parent->events.new_popup, xdg_surface->popup);
+	}
+}
+
+void destroy_xdg_popup(struct wlr_xdg_surface *surface) {
+	assert(surface->role == WLR_XDG_SURFACE_ROLE_POPUP);
+	unmap_xdg_surface(surface);
+
+	wl_resource_set_user_data(surface->popup->resource, NULL);
+	wl_list_remove(&surface->popup->link);
+	free(surface->popup);
+	surface->popup = NULL;
+
+	surface->role = WLR_XDG_SURFACE_ROLE_NONE;
+}
+
+void wlr_xdg_popup_get_anchor_point(struct wlr_xdg_popup *popup,
+		int *root_sx, int *root_sy) {
+	struct wlr_box rect = popup->positioner.anchor_rect;
+	enum xdg_positioner_anchor anchor = popup->positioner.anchor;
+	int sx = 0, sy = 0;
+
+	if (anchor == XDG_POSITIONER_ANCHOR_NONE) {
+		sx = (rect.x + rect.width) / 2;
+		sy = (rect.y + rect.height) / 2;
+	} else if (anchor == XDG_POSITIONER_ANCHOR_TOP) {
+		sx = (rect.x + rect.width) / 2;
+		sy = rect.y;
+	} else if (anchor == XDG_POSITIONER_ANCHOR_BOTTOM) {
+		sx = (rect.x + rect.width) / 2;
+		sy = rect.y + rect.height;
+	} else if (anchor == XDG_POSITIONER_ANCHOR_LEFT) {
+		sx = rect.x;
+		sy = (rect.y + rect.height) / 2;
+	} else if (anchor == XDG_POSITIONER_ANCHOR_RIGHT) {
+		sx = rect.x + rect.width;
+		sy = (rect.y + rect.height) / 2;
+	} else if (anchor == XDG_POSITIONER_ANCHOR_TOP_LEFT) {
+		sx = rect.x;
+		sy = rect.y;
+	} else if (anchor == XDG_POSITIONER_ANCHOR_TOP_RIGHT) {
+		sx = rect.x + rect.width;
+		sy = rect.y;
+	} else if (anchor == XDG_POSITIONER_ANCHOR_BOTTOM_LEFT) {
+		sx = rect.x;
+		sy = rect.y + rect.height;
+	} else if (anchor == XDG_POSITIONER_ANCHOR_BOTTOM_RIGHT) {
+		sx = rect.x + rect.width;
+		sy = rect.y + rect.height;
+	}
+
+	*root_sx = sx;
+	*root_sy = sy;
+}
+
+void wlr_xdg_popup_get_toplevel_coords(struct wlr_xdg_popup *popup,
+		int popup_sx, int popup_sy, int *toplevel_sx, int *toplevel_sy) {
+	struct wlr_xdg_surface *parent =
+		wlr_xdg_surface_from_wlr_surface(popup->parent);
+	while (parent != NULL && parent->role == WLR_XDG_SURFACE_ROLE_POPUP) {
+		popup_sx += parent->popup->geometry.x;
+		popup_sy += parent->popup->geometry.y;
+		parent = wlr_xdg_surface_from_wlr_surface(parent->popup->parent);
+	}
+	assert(parent);
+
+	*toplevel_sx = popup_sx + parent->geometry.x;
+	*toplevel_sy = popup_sy + parent->geometry.y;
+}
+
+static void xdg_popup_box_constraints(struct wlr_xdg_popup *popup,
+		struct wlr_box *toplevel_sx_box, int *offset_x, int *offset_y) {
+	int popup_width = popup->geometry.width;
+	int popup_height = popup->geometry.height;
+	int anchor_sx = 0, anchor_sy = 0;
+	wlr_xdg_popup_get_anchor_point(popup, &anchor_sx, &anchor_sy);
+	int popup_sx = 0, popup_sy = 0;
+	wlr_xdg_popup_get_toplevel_coords(popup, popup->geometry.x,
+		popup->geometry.y, &popup_sx, &popup_sy);
+	*offset_x = 0, *offset_y = 0;
+
+	if (popup_sx < toplevel_sx_box->x) {
+		*offset_x = toplevel_sx_box->x - popup_sx;
+	} else if (popup_sx + popup_width >
+			toplevel_sx_box->x + toplevel_sx_box->width) {
+		*offset_x = toplevel_sx_box->x + toplevel_sx_box->width -
+			(popup_sx + popup_width);
+	}
+
+	if (popup_sy < toplevel_sx_box->y) {
+		*offset_y = toplevel_sx_box->y - popup_sy;
+	} else if (popup_sy + popup_height >
+			toplevel_sx_box->y + toplevel_sx_box->height) {
+		*offset_y = toplevel_sx_box->y + toplevel_sx_box->height -
+			(popup_sy + popup_height);
+	}
+}
+
+static bool xdg_popup_unconstrain_flip(struct wlr_xdg_popup *popup,
+		struct wlr_box *toplevel_sx_box) {
+	int offset_x = 0, offset_y = 0;
+	xdg_popup_box_constraints(popup, toplevel_sx_box,
+		&offset_x, &offset_y);
+
+	if (!offset_x && !offset_y) {
+		return true;
+	}
+
+	bool flip_x = offset_x &&
+		(popup->positioner.constraint_adjustment &
+		 XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_FLIP_X);
+
+	bool flip_y = offset_y &&
+		(popup->positioner.constraint_adjustment &
+		 XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_FLIP_Y);
+
+	if (flip_x) {
+		wlr_positioner_invert_x(&popup->positioner);
+	}
+	if (flip_y) {
+		wlr_positioner_invert_y(&popup->positioner);
+	}
+
+	popup->geometry =
+		wlr_xdg_positioner_get_geometry(&popup->positioner);
+
+	xdg_popup_box_constraints(popup, toplevel_sx_box,
+		&offset_x, &offset_y);
+
+	if (!offset_x && !offset_y) {
+		// no longer constrained
+		return true;
+	}
+
+	// revert the positioner back if it didn't fix it and go to the next part
+	if (flip_x) {
+		wlr_positioner_invert_x(&popup->positioner);
+	}
+	if (flip_y) {
+		wlr_positioner_invert_y(&popup->positioner);
+	}
+
+	popup->geometry =
+		wlr_xdg_positioner_get_geometry(&popup->positioner);
+
+	return false;
+}
+
+static bool xdg_popup_unconstrain_slide(struct wlr_xdg_popup *popup,
+		struct wlr_box *toplevel_sx_box) {
+	int offset_x = 0, offset_y = 0;
+	xdg_popup_box_constraints(popup, toplevel_sx_box,
+		&offset_x, &offset_y);
+
+	if (!offset_x && !offset_y) {
+		return true;
+	}
+
+	bool slide_x = offset_x &&
+		(popup->positioner.constraint_adjustment &
+		 XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_SLIDE_X);
+
+	bool slide_y = offset_x &&
+		(popup->positioner.constraint_adjustment &
+		 XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_SLIDE_Y);
+
+	if (slide_x) {
+		popup->geometry.x += offset_x;
+	}
+
+	if (slide_y) {
+		popup->geometry.y += offset_y;
+	}
+
+	int toplevel_x = 0, toplevel_y = 0;
+	wlr_xdg_popup_get_toplevel_coords(popup, popup->geometry.x,
+		popup->geometry.y, &toplevel_x, &toplevel_y);
+
+	if (slide_x && toplevel_x < toplevel_sx_box->x) {
+		popup->geometry.x += toplevel_sx_box->x - toplevel_x;
+	}
+	if (slide_y && toplevel_y < toplevel_sx_box->y) {
+		popup->geometry.y += toplevel_sx_box->y - toplevel_y;
+	}
+
+	xdg_popup_box_constraints(popup, toplevel_sx_box,
+		&offset_x, &offset_y);
+
+	return !offset_x && !offset_y;
+}
+
+static bool xdg_popup_unconstrain_resize(struct wlr_xdg_popup *popup,
+		struct wlr_box *toplevel_sx_box) {
+	int offset_x, offset_y;
+	xdg_popup_box_constraints(popup, toplevel_sx_box,
+		&offset_x, &offset_y);
+
+	if (!offset_x && !offset_y) {
+		return true;
+	}
+
+	bool resize_x = offset_x &&
+		(popup->positioner.constraint_adjustment &
+		 XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_RESIZE_X);
+
+	bool resize_y = offset_x &&
+		(popup->positioner.constraint_adjustment &
+		 XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_RESIZE_Y);
+
+	if (resize_x) {
+		popup->geometry.width -= offset_x;
+	}
+	if (resize_y) {
+		popup->geometry.height -= offset_y;
+	}
+
+	xdg_popup_box_constraints(popup, toplevel_sx_box,
+		&offset_y, &offset_y);
+
+	return !offset_x && !offset_y;
+}
+
+void wlr_xdg_popup_unconstrain_from_box(struct wlr_xdg_popup *popup,
+		struct wlr_box *toplevel_sx_box) {
+	if (xdg_popup_unconstrain_flip(popup, toplevel_sx_box)) {
+		return;
+	}
+	if (xdg_popup_unconstrain_slide(popup, toplevel_sx_box)) {
+		return;
+	}
+	if (xdg_popup_unconstrain_resize(popup, toplevel_sx_box)) {
+		return;
+	}
+}

types/xdg_shell/wlr_xdg_positioner.c

@@ -0,0 +1,309 @@
+#include <assert.h>
+#include <stdlib.h>
+#include "types/wlr_xdg_shell.h"
+
+static const struct xdg_positioner_interface xdg_positioner_implementation;
+
+struct wlr_xdg_positioner_resource *get_xdg_positioner_from_resource(
+		struct wl_resource *resource) {
+	assert(wl_resource_instance_of(resource, &xdg_positioner_interface,
+		&xdg_positioner_implementation));
+	return wl_resource_get_user_data(resource);
+}
+
+static void xdg_positioner_handle_set_size(struct wl_client *client,
+		struct wl_resource *resource, int32_t width, int32_t height) {
+	struct wlr_xdg_positioner_resource *positioner =
+		get_xdg_positioner_from_resource(resource);
+
+	if (width < 1 || height < 1) {
+		wl_resource_post_error(resource,
+			XDG_POSITIONER_ERROR_INVALID_INPUT,
+			"width and height must be positive and non-zero");
+		return;
+	}
+
+	positioner->attrs.size.width = width;
+	positioner->attrs.size.height = height;
+}
+
+static void xdg_positioner_handle_set_anchor_rect(struct wl_client *client,
+		struct wl_resource *resource, int32_t x, int32_t y, int32_t width,
+		int32_t height) {
+	struct wlr_xdg_positioner_resource *positioner =
+		get_xdg_positioner_from_resource(resource);
+
+	if (width < 0 || height < 0) {
+		wl_resource_post_error(resource,
+			XDG_POSITIONER_ERROR_INVALID_INPUT,
+			"width and height must be positive");
+		return;
+	}
+
+	positioner->attrs.anchor_rect.x = x;
+	positioner->attrs.anchor_rect.y = y;
+	positioner->attrs.anchor_rect.width = width;
+	positioner->attrs.anchor_rect.height = height;
+}
+
+static void xdg_positioner_handle_set_anchor(struct wl_client *client,
+		struct wl_resource *resource, uint32_t anchor) {
+	struct wlr_xdg_positioner_resource *positioner =
+		get_xdg_positioner_from_resource(resource);
+
+	if (anchor > XDG_POSITIONER_ANCHOR_BOTTOM_RIGHT) {
+		wl_resource_post_error(resource,
+			XDG_POSITIONER_ERROR_INVALID_INPUT,
+			"invalid anchor value");
+		return;
+	}
+
+	positioner->attrs.anchor = anchor;
+}
+
+static void xdg_positioner_handle_set_gravity(struct wl_client *client,
+		struct wl_resource *resource, uint32_t gravity) {
+	struct wlr_xdg_positioner_resource *positioner =
+		get_xdg_positioner_from_resource(resource);
+
+	if (gravity > XDG_POSITIONER_GRAVITY_BOTTOM_RIGHT) {
+		wl_resource_post_error(resource,
+			XDG_POSITIONER_ERROR_INVALID_INPUT,
+			"invalid gravity value");
+		return;
+	}
+
+	positioner->attrs.gravity = gravity;
+}
+
+static void xdg_positioner_handle_set_constraint_adjustment(
+		struct wl_client *client, struct wl_resource *resource,
+		uint32_t constraint_adjustment) {
+	struct wlr_xdg_positioner_resource *positioner =
+		get_xdg_positioner_from_resource(resource);
+
+	positioner->attrs.constraint_adjustment = constraint_adjustment;
+}
+
+static void xdg_positioner_handle_set_offset(struct wl_client *client,
+		struct wl_resource *resource, int32_t x, int32_t y) {
+	struct wlr_xdg_positioner_resource *positioner =
+		get_xdg_positioner_from_resource(resource);
+
+	positioner->attrs.offset.x = x;
+	positioner->attrs.offset.y = y;
+}
+
+static void xdg_positioner_handle_destroy(struct wl_client *client,
+		struct wl_resource *resource) {
+	wl_resource_destroy(resource);
+}
+
+static const struct xdg_positioner_interface
+		xdg_positioner_implementation = {
+	.destroy = xdg_positioner_handle_destroy,
+	.set_size = xdg_positioner_handle_set_size,
+	.set_anchor_rect = xdg_positioner_handle_set_anchor_rect,
+	.set_anchor = xdg_positioner_handle_set_anchor,
+	.set_gravity = xdg_positioner_handle_set_gravity,
+	.set_constraint_adjustment =
+		xdg_positioner_handle_set_constraint_adjustment,
+	.set_offset = xdg_positioner_handle_set_offset,
+};
+
+static void xdg_positioner_handle_resource_destroy(
+		struct wl_resource *resource) {
+	struct wlr_xdg_positioner_resource *positioner =
+		get_xdg_positioner_from_resource(resource);
+	free(positioner);
+}
+
+void create_xdg_positioner(struct wlr_xdg_client *client, uint32_t id) {
+	struct wlr_xdg_positioner_resource *positioner =
+		calloc(1, sizeof(struct wlr_xdg_positioner_resource));
+	if (positioner == NULL) {
+		wl_client_post_no_memory(client->client);
+		return;
+	}
+
+	positioner->resource = wl_resource_create(client->client,
+		&xdg_positioner_interface,
+		wl_resource_get_version(client->resource),
+		id);
+	if (positioner->resource == NULL) {
+		free(positioner);
+		wl_client_post_no_memory(client->client);
+		return;
+	}
+	wl_resource_set_implementation(positioner->resource,
+		&xdg_positioner_implementation,
+		positioner, xdg_positioner_handle_resource_destroy);
+}
+
+void handle_xdg_surface_popup_committed(struct wlr_xdg_surface *surface) {
+	assert(surface->role == WLR_XDG_SURFACE_ROLE_POPUP);
+
+	if (!surface->popup->parent) {
+		wl_resource_post_error(surface->resource,
+			XDG_SURFACE_ERROR_NOT_CONSTRUCTED,
+			"xdg_popup has no parent");
+		return;
+	}
+
+	if (!surface->popup->committed) {
+		schedule_xdg_surface_configure(surface);
+		surface->popup->committed = true;
+	}
+}
+
+static bool positioner_anchor_has_edge(enum xdg_positioner_anchor anchor,
+		enum xdg_positioner_anchor edge) {
+	switch (edge) {
+	case XDG_POSITIONER_ANCHOR_TOP:
+		return anchor == XDG_POSITIONER_ANCHOR_TOP ||
+			anchor == XDG_POSITIONER_ANCHOR_TOP_LEFT ||
+			anchor == XDG_POSITIONER_ANCHOR_TOP_RIGHT;
+	case XDG_POSITIONER_ANCHOR_BOTTOM:
+		return anchor == XDG_POSITIONER_ANCHOR_BOTTOM ||
+			anchor == XDG_POSITIONER_ANCHOR_BOTTOM_LEFT ||
+			anchor == XDG_POSITIONER_ANCHOR_BOTTOM_RIGHT;
+	case XDG_POSITIONER_ANCHOR_LEFT:
+		return anchor == XDG_POSITIONER_ANCHOR_LEFT ||
+			anchor == XDG_POSITIONER_ANCHOR_TOP_LEFT ||
+			anchor == XDG_POSITIONER_ANCHOR_BOTTOM_LEFT;
+	case XDG_POSITIONER_ANCHOR_RIGHT:
+		return anchor == XDG_POSITIONER_ANCHOR_RIGHT ||
+			anchor == XDG_POSITIONER_ANCHOR_TOP_RIGHT ||
+			anchor == XDG_POSITIONER_ANCHOR_BOTTOM_RIGHT;
+	default:
+		assert(false); // not reached
+	}
+}
+
+static bool positioner_gravity_has_edge(enum xdg_positioner_gravity gravity,
+		enum xdg_positioner_gravity edge) {
+	// gravity and edge enums are the same
+	return positioner_anchor_has_edge((enum xdg_positioner_anchor)gravity,
+		(enum xdg_positioner_anchor)edge);
+}
+
+struct wlr_box wlr_xdg_positioner_get_geometry(
+		struct wlr_xdg_positioner *positioner) {
+	struct wlr_box geometry = {
+		.x = positioner->offset.x,
+		.y = positioner->offset.y,
+		.width = positioner->size.width,
+		.height = positioner->size.height,
+	};
+
+	if (positioner_anchor_has_edge(positioner->anchor,
+			XDG_POSITIONER_ANCHOR_TOP)) {
+		geometry.y += positioner->anchor_rect.y;
+	} else if (positioner_anchor_has_edge(positioner->anchor,
+			XDG_POSITIONER_ANCHOR_BOTTOM)) {
+		geometry.y +=
+			positioner->anchor_rect.y + positioner->anchor_rect.height;
+	} else {
+		geometry.y +=
+			positioner->anchor_rect.y + positioner->anchor_rect.height / 2;
+	}
+
+	if (positioner_anchor_has_edge(positioner->anchor,
+			XDG_POSITIONER_ANCHOR_LEFT)) {
+		geometry.x += positioner->anchor_rect.x;
+	} else if (positioner_anchor_has_edge(positioner->anchor,
+			XDG_POSITIONER_ANCHOR_RIGHT)) {
+		geometry.x += positioner->anchor_rect.x + positioner->anchor_rect.width;
+	} else {
+		geometry.x +=
+			positioner->anchor_rect.x + positioner->anchor_rect.width / 2;
+	}
+
+	if (positioner_gravity_has_edge(positioner->gravity,
+			XDG_POSITIONER_GRAVITY_TOP)) {
+		geometry.y -= geometry.height;
+	} else if (positioner_gravity_has_edge(positioner->gravity,
+			XDG_POSITIONER_GRAVITY_BOTTOM)) {
+		geometry.y = geometry.y;
+	} else {
+		geometry.y -= geometry.height / 2;
+	}
+
+	if (positioner_gravity_has_edge(positioner->gravity,
+			XDG_POSITIONER_GRAVITY_LEFT)) {
+		geometry.x -= geometry.width;
+	} else if (positioner_gravity_has_edge(positioner->gravity,
+			XDG_POSITIONER_GRAVITY_RIGHT)) {
+		geometry.x = geometry.x;
+	} else {
+		geometry.x -= geometry.width / 2;
+	}
+
+	if (positioner->constraint_adjustment ==
+			XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_NONE) {
+		return geometry;
+	}
+
+	return geometry;
+}
+
+static enum xdg_positioner_anchor positioner_anchor_invert_x(
+		enum xdg_positioner_anchor anchor) {
+	switch (anchor) {
+	case XDG_POSITIONER_ANCHOR_LEFT:
+		return XDG_POSITIONER_ANCHOR_RIGHT;
+	case XDG_POSITIONER_ANCHOR_RIGHT:
+		return XDG_POSITIONER_ANCHOR_LEFT;
+	case XDG_POSITIONER_ANCHOR_TOP_LEFT:
+		return XDG_POSITIONER_ANCHOR_TOP_RIGHT;
+	case XDG_POSITIONER_ANCHOR_BOTTOM_LEFT:
+		return XDG_POSITIONER_ANCHOR_BOTTOM_RIGHT;
+	case XDG_POSITIONER_ANCHOR_BOTTOM_RIGHT:
+		return XDG_POSITIONER_ANCHOR_BOTTOM_LEFT;
+	default:
+		return anchor;
+	}
+}
+
+static enum xdg_positioner_gravity positioner_gravity_invert_x(
+		enum xdg_positioner_gravity gravity) {
+	// gravity and edge enums are the same
+	return (enum xdg_positioner_gravity)positioner_anchor_invert_x(
+		(enum xdg_positioner_anchor)gravity);
+}
+
+static enum xdg_positioner_anchor positioner_anchor_invert_y(
+		enum xdg_positioner_anchor anchor) {
+	switch (anchor) {
+	case XDG_POSITIONER_ANCHOR_TOP:
+		return XDG_POSITIONER_ANCHOR_BOTTOM;
+	case XDG_POSITIONER_ANCHOR_BOTTOM:
+		return XDG_POSITIONER_ANCHOR_TOP;
+	case XDG_POSITIONER_ANCHOR_TOP_LEFT:
+		return XDG_POSITIONER_ANCHOR_BOTTOM_LEFT;
+	case XDG_POSITIONER_ANCHOR_BOTTOM_LEFT:
+		return XDG_POSITIONER_ANCHOR_TOP_LEFT;
+	case XDG_POSITIONER_ANCHOR_BOTTOM_RIGHT:
+		return XDG_POSITIONER_ANCHOR_TOP_RIGHT;
+	default:
+		return anchor;
+	}
+}
+
+static enum xdg_positioner_gravity positioner_gravity_invert_y(
+		enum xdg_positioner_gravity gravity) {
+	// gravity and edge enums are the same
+	return (enum xdg_positioner_gravity)positioner_anchor_invert_y(
+		(enum xdg_positioner_anchor)gravity);
+}
+
+
+void wlr_positioner_invert_x(struct wlr_xdg_positioner *positioner) {
+	positioner->anchor = positioner_anchor_invert_x(positioner->anchor);
+	positioner->gravity = positioner_gravity_invert_x(positioner->gravity);
+}
+
+void wlr_positioner_invert_y(struct wlr_xdg_positioner *positioner) {
+	positioner->anchor = positioner_anchor_invert_y(positioner->anchor);
+	positioner->gravity = positioner_gravity_invert_y(positioner->gravity);
+}

types/xdg_shell/wlr_xdg_shell.c

@@ -0,0 +1,172 @@
+#include <assert.h>
+#include <stdlib.h>
+#include "types/wlr_xdg_shell.h"
+#include "util/signal.h"
+
+#define WM_BASE_VERSION 1
+
+static const struct xdg_wm_base_interface xdg_shell_impl;
+
+static struct wlr_xdg_client *xdg_client_from_resource(
+		struct wl_resource *resource) {
+	assert(wl_resource_instance_of(resource, &xdg_wm_base_interface,
+		&xdg_shell_impl));
+	return wl_resource_get_user_data(resource);
+}
+
+static void xdg_shell_handle_create_positioner(struct wl_client *wl_client,
+		struct wl_resource *resource, uint32_t id) {
+	struct wlr_xdg_client *client =
+		xdg_client_from_resource(resource);
+	create_xdg_positioner(client, id);
+}
+
+static void xdg_shell_handle_get_xdg_surface(struct wl_client *wl_client,
+		struct wl_resource *client_resource, uint32_t id,
+		struct wl_resource *surface_resource) {
+	struct wlr_xdg_client *client =
+		xdg_client_from_resource(client_resource);
+	struct wlr_surface *surface = wlr_surface_from_resource(surface_resource);
+	create_xdg_surface(client, surface, id);
+}
+
+static void xdg_shell_handle_pong(struct wl_client *wl_client,
+		struct wl_resource *resource, uint32_t serial) {
+	struct wlr_xdg_client *client = xdg_client_from_resource(resource);
+
+	if (client->ping_serial != serial) {
+		return;
+	}
+
+	wl_event_source_timer_update(client->ping_timer, 0);
+	client->ping_serial = 0;
+}
+
+static void xdg_shell_handle_destroy(struct wl_client *wl_client,
+		struct wl_resource *resource) {
+	struct wlr_xdg_client *client = xdg_client_from_resource(resource);
+
+	if (!wl_list_empty(&client->surfaces)) {
+		wl_resource_post_error(client->resource,
+			XDG_WM_BASE_ERROR_DEFUNCT_SURFACES,
+			"xdg_wm_base was destroyed before children");
+		return;
+	}
+
+	wl_resource_destroy(resource);
+}
+
+static const struct xdg_wm_base_interface xdg_shell_impl = {
+	.destroy = xdg_shell_handle_destroy,
+	.create_positioner = xdg_shell_handle_create_positioner,
+	.get_xdg_surface = xdg_shell_handle_get_xdg_surface,
+	.pong = xdg_shell_handle_pong,
+};
+
+static void xdg_client_handle_resource_destroy(struct wl_resource *resource) {
+	struct wlr_xdg_client *client = xdg_client_from_resource(resource);
+
+	struct wlr_xdg_surface *surface, *tmp = NULL;
+	wl_list_for_each_safe(surface, tmp, &client->surfaces, link) {
+		destroy_xdg_surface(surface);
+	}
+
+	if (client->ping_timer != NULL) {
+		wl_event_source_remove(client->ping_timer);
+	}
+
+	wl_list_remove(&client->link);
+	free(client);
+}
+
+static int xdg_client_ping_timeout(void *user_data) {
+	struct wlr_xdg_client *client = user_data;
+
+	struct wlr_xdg_surface *surface;
+	wl_list_for_each(surface, &client->surfaces, link) {
+		wlr_signal_emit_safe(&surface->events.ping_timeout, surface);
+	}
+
+	client->ping_serial = 0;
+	return 1;
+}
+
+static void xdg_shell_bind(struct wl_client *wl_client, void *data,
+		uint32_t version, uint32_t id) {
+	struct wlr_xdg_shell *xdg_shell = data;
+	assert(wl_client && xdg_shell);
+
+	struct wlr_xdg_client *client =
+		calloc(1, sizeof(struct wlr_xdg_client));
+	if (client == NULL) {
+		wl_client_post_no_memory(wl_client);
+		return;
+	}
+
+	wl_list_init(&client->surfaces);
+
+	client->resource =
+		wl_resource_create(wl_client, &xdg_wm_base_interface, version, id);
+	if (client->resource == NULL) {
+		free(client);
+		wl_client_post_no_memory(wl_client);
+		return;
+	}
+	client->client = wl_client;
+	client->shell = xdg_shell;
+
+	wl_resource_set_implementation(client->resource, &xdg_shell_impl, client,
+		xdg_client_handle_resource_destroy);
+	wl_list_insert(&xdg_shell->clients, &client->link);
+
+	struct wl_display *display = wl_client_get_display(client->client);
+	struct wl_event_loop *loop = wl_display_get_event_loop(display);
+	client->ping_timer = wl_event_loop_add_timer(loop,
+		xdg_client_ping_timeout, client);
+	if (client->ping_timer == NULL) {
+		wl_client_post_no_memory(client->client);
+	}
+}
+
+static void handle_display_destroy(struct wl_listener *listener, void *data) {
+	struct wlr_xdg_shell *xdg_shell =
+		wl_container_of(listener, xdg_shell, display_destroy);
+	wlr_xdg_shell_destroy(xdg_shell);
+}
+
+struct wlr_xdg_shell *wlr_xdg_shell_create(struct wl_display *display) {
+	struct wlr_xdg_shell *xdg_shell =
+		calloc(1, sizeof(struct wlr_xdg_shell));
+	if (!xdg_shell) {
+		return NULL;
+	}
+
+	xdg_shell->ping_timeout = 10000;
+
+	wl_list_init(&xdg_shell->clients);
+	wl_list_init(&xdg_shell->popup_grabs);
+
+	struct wl_global *wl_global = wl_global_create(display,
+		&xdg_wm_base_interface, WM_BASE_VERSION, xdg_shell, xdg_shell_bind);
+	if (!wl_global) {
+		free(xdg_shell);
+		return NULL;
+	}
+	xdg_shell->wl_global = wl_global;
+
+	wl_signal_init(&xdg_shell->events.new_surface);
+
+	xdg_shell->display_destroy.notify = handle_display_destroy;
+	wl_display_add_destroy_listener(display, &xdg_shell->display_destroy);
+
+	return xdg_shell;
+}
+
+void wlr_xdg_shell_destroy(struct wlr_xdg_shell *xdg_shell) {
+	if (!xdg_shell) {
+		return;
+	}
+	wl_list_remove(&xdg_shell->display_destroy.link);
+	wl_global_destroy(xdg_shell->wl_global);
+	free(xdg_shell);
+}

types/xdg_shell/wlr_xdg_surface.c

@@ -0,0 +1,548 @@
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+#include <wlr/util/log.h>
+#include "types/wlr_xdg_shell.h"
+#include "util/signal.h"
+
+bool wlr_surface_is_xdg_surface(struct wlr_surface *surface) {
+	return surface->role != NULL &&
+		(strcmp(surface->role, XDG_TOPLEVEL_ROLE) == 0 ||
+		strcmp(surface->role, XDG_POPUP_ROLE) == 0);
+}
+
+struct wlr_xdg_surface *wlr_xdg_surface_from_wlr_surface(
+		struct wlr_surface *surface) {
+	assert(wlr_surface_is_xdg_surface(surface));
+	return (struct wlr_xdg_surface *)surface->role_data;
+}
+
+static void xdg_surface_configure_destroy(
+		struct wlr_xdg_surface_configure *configure) {
+	if (configure == NULL) {
+		return;
+	}
+	wl_list_remove(&configure->link);
+	free(configure->toplevel_state);
+	free(configure);
+}
+
+void unmap_xdg_surface(struct wlr_xdg_surface *surface) {
+	assert(surface->role != WLR_XDG_SURFACE_ROLE_NONE);
+
+	// TODO: probably need to ungrab before this event
+	if (surface->mapped) {
+		wlr_signal_emit_safe(&surface->events.unmap, surface);
+	}
+
+	switch (surface->role) {
+	case WLR_XDG_SURFACE_ROLE_TOPLEVEL:
+		free(surface->toplevel->title);
+		surface->toplevel->title = NULL;
+		free(surface->toplevel->app_id);
+		surface->toplevel->app_id = NULL;
+		break;
+	case WLR_XDG_SURFACE_ROLE_POPUP:
+		if (surface->popup->seat != NULL) {
+			struct wlr_xdg_popup_grab *grab =
+				get_xdg_shell_popup_grab_from_seat(surface->client->shell,
+					surface->popup->seat);
+
+			wl_list_remove(&surface->popup->grab_link);
+
+			if (wl_list_empty(&grab->popups)) {
+				if (grab->seat->pointer_state.grab == &grab->pointer_grab) {
+					wlr_seat_pointer_end_grab(grab->seat);
+				}
+				if (grab->seat->keyboard_state.grab == &grab->keyboard_grab) {
+					wlr_seat_keyboard_end_grab(grab->seat);
+				}
+			}
+
+			surface->popup->seat = NULL;
+		}
+		break;
+	case WLR_XDG_SURFACE_ROLE_NONE:
+		assert(false && "not reached");
+	}
+
+	struct wlr_xdg_surface_configure *configure, *tmp;
+	wl_list_for_each_safe(configure, tmp, &surface->configure_list, link) {
+		xdg_surface_configure_destroy(configure);
+	}
+
+	surface->configured = surface->mapped = false;
+	surface->configure_serial = 0;
+	if (surface->configure_idle) {
+		wl_event_source_remove(surface->configure_idle);
+		surface->configure_idle = NULL;
+	}
+	surface->configure_next_serial = 0;
+
+	surface->has_next_geometry = false;
+	memset(&surface->geometry, 0, sizeof(struct wlr_box));
+	memset(&surface->next_geometry, 0, sizeof(struct wlr_box));
+}
+
+void destroy_xdg_toplevel(struct wlr_xdg_surface *surface) {
+	assert(surface->role == WLR_XDG_SURFACE_ROLE_TOPLEVEL);
+	unmap_xdg_surface(surface);
+
+	wl_resource_set_user_data(surface->toplevel->resource, NULL);
+	free(surface->toplevel);
+	surface->toplevel = NULL;
+
+	surface->role = WLR_XDG_SURFACE_ROLE_NONE;
+}
+
+
+
+static void xdg_surface_handle_ack_configure(struct wl_client *client,
+		struct wl_resource *resource, uint32_t serial) {
+	struct wlr_xdg_surface *surface = wlr_xdg_surface_from_resource(resource);
+
+	if (surface->role == WLR_XDG_SURFACE_ROLE_NONE) {
+		wl_resource_post_error(surface->resource,
+			XDG_SURFACE_ERROR_NOT_CONSTRUCTED,
+			"xdg_surface must have a role");
+		return;
+	}
+
+	bool found = false;
+	struct wlr_xdg_surface_configure *configure, *tmp;
+	wl_list_for_each_safe(configure, tmp, &surface->configure_list, link) {
+		if (configure->serial < serial) {
+			xdg_surface_configure_destroy(configure);
+		} else if (configure->serial == serial) {
+			found = true;
+			break;
+		} else {
+			break;
+		}
+	}
+	if (!found) {
+		wl_resource_post_error(surface->client->resource,
+			XDG_WM_BASE_ERROR_INVALID_SURFACE_STATE,
+			"wrong configure serial: %u", serial);
+		return;
+	}
+
+	switch (surface->role) {
+	case WLR_XDG_SURFACE_ROLE_NONE:
+		assert(0 && "not reached");
+		break;
+	case WLR_XDG_SURFACE_ROLE_TOPLEVEL:
+		handle_xdg_toplevel_ack_configure(surface, configure);
+		break;
+	case WLR_XDG_SURFACE_ROLE_POPUP:
+		break;
+	}
+
+	surface->configured = true;
+	surface->configure_serial = serial;
+
+	xdg_surface_configure_destroy(configure);
+}
+
+static void surface_send_configure(void *user_data) {
+	struct wlr_xdg_surface *surface = user_data;
+
+	surface->configure_idle = NULL;
+
+	struct wlr_xdg_surface_configure *configure =
+		calloc(1, sizeof(struct wlr_xdg_surface_configure));
+	if (configure == NULL) {
+		wl_client_post_no_memory(surface->client->client);
+		return;
+	}
+
+	wl_list_insert(surface->configure_list.prev, &configure->link);
+	configure->serial = surface->configure_next_serial;
+
+	switch (surface->role) {
+	case WLR_XDG_SURFACE_ROLE_NONE:
+		assert(0 && "not reached");
+		break;
+	case WLR_XDG_SURFACE_ROLE_TOPLEVEL:
+		send_xdg_toplevel_configure(surface, configure);
+		break;
+	case WLR_XDG_SURFACE_ROLE_POPUP:
+		xdg_popup_send_configure(surface->popup->resource,
+			surface->popup->geometry.x,
+			surface->popup->geometry.y,
+			surface->popup->geometry.width,
+			surface->popup->geometry.height);
+		break;
+	}
+
+	xdg_surface_send_configure(surface->resource, configure->serial);
+}
+
+uint32_t schedule_xdg_surface_configure(
+		struct wlr_xdg_surface *surface) {
+	struct wl_display *display = wl_client_get_display(surface->client->client);
+	struct wl_event_loop *loop = wl_display_get_event_loop(display);
+	bool pending_same = false;
+
+	switch (surface->role) {
+	case WLR_XDG_SURFACE_ROLE_NONE:
+		assert(0 && "not reached");
+		break;
+	case WLR_XDG_SURFACE_ROLE_TOPLEVEL:
+		pending_same =
+			compare_xdg_surface_toplevel_state(surface->toplevel);
+		break;
+	case WLR_XDG_SURFACE_ROLE_POPUP:
+		break;
+	}
+
+	if (surface->configure_idle != NULL) {
+		if (!pending_same) {
+			// configure request already scheduled
+			return surface->configure_next_serial;
+		}
+
+		// configure request not necessary anymore
+		wl_event_source_remove(surface->configure_idle);
+		surface->configure_idle = NULL;
+		return 0;
+	} else {
+		if (pending_same) {
+			// configure request not necessary
+			return 0;
+		}
+
+		surface->configure_next_serial = wl_display_next_serial(display);
+		surface->configure_idle = wl_event_loop_add_idle(loop,
+			surface_send_configure, surface);
+		return surface->configure_next_serial;
+	}
+}
+
+static void xdg_surface_handle_get_popup(struct wl_client *client,
+		struct wl_resource *resource, uint32_t id,
+		struct wl_resource *parent_resource,
+		struct wl_resource *positioner_resource) {
+	struct wlr_xdg_surface *xdg_surface =
+		wlr_xdg_surface_from_resource(resource);
+	struct wlr_xdg_surface *parent =
+		wlr_xdg_surface_from_resource(parent_resource);
+	struct wlr_xdg_positioner_resource *positioner =
+		get_xdg_positioner_from_resource(positioner_resource);
+	create_xdg_popup(xdg_surface, parent, positioner, id);
+}
+
+static void xdg_surface_handle_get_toplevel(struct wl_client *client,
+		struct wl_resource *resource, uint32_t id) {
+	struct wlr_xdg_surface *xdg_surface =
+		wlr_xdg_surface_from_resource(resource);
+	create_xdg_toplevel(xdg_surface, id);
+}
+
+static void xdg_surface_handle_set_window_geometry(struct wl_client *client,
+		struct wl_resource *resource, int32_t x, int32_t y, int32_t width,
+		int32_t height) {
+	struct wlr_xdg_surface *surface = wlr_xdg_surface_from_resource(resource);
+
+	if (surface->role == WLR_XDG_SURFACE_ROLE_NONE) {
+		wl_resource_post_error(surface->resource,
+			XDG_SURFACE_ERROR_NOT_CONSTRUCTED,
+			"xdg_surface must have a role");
+		return;
+	}
+
+	surface->has_next_geometry = true;
+	surface->next_geometry.height = height;
+	surface->next_geometry.width = width;
+	surface->next_geometry.x = x;
+	surface->next_geometry.y = y;
+}
+
+static void xdg_surface_handle_destroy(struct wl_client *client,
+		struct wl_resource *resource) {
+	struct wlr_xdg_surface *surface = wlr_xdg_surface_from_resource(resource);
+
+	if (surface->role != WLR_XDG_SURFACE_ROLE_NONE) {
+		wlr_log(L_ERROR, "Tried to destroy an xdg_surface before its role "
+			"object");
+		return;
+	}
+
+	wl_resource_destroy(resource);
+}
+
+static const struct xdg_surface_interface xdg_surface_implementation = {
+	.destroy = xdg_surface_handle_destroy,
+	.get_toplevel = xdg_surface_handle_get_toplevel,
+	.get_popup = xdg_surface_handle_get_popup,
+	.ack_configure = xdg_surface_handle_ack_configure,
+	.set_window_geometry = xdg_surface_handle_set_window_geometry,
+};
+
+static void xdg_surface_handle_resource_destroy(struct wl_resource *resource) {
+	struct wlr_xdg_surface *surface =
+		wlr_xdg_surface_from_resource(resource);
+	if (surface != NULL) {
+		destroy_xdg_surface(surface);
+	}
+}
+
+static void handle_surface_committed(struct wlr_surface *wlr_surface,
+		void *role_data) {
+	struct wlr_xdg_surface *surface = role_data;
+
+	if (wlr_surface_has_buffer(surface->surface) && !surface->configured) {
+		wl_resource_post_error(surface->resource,
+			XDG_SURFACE_ERROR_UNCONFIGURED_BUFFER,
+			"xdg_surface has never been configured");
+		return;
+	}
+
+	if (surface->has_next_geometry) {
+		surface->has_next_geometry = false;
+		surface->geometry.x = surface->next_geometry.x;
+		surface->geometry.y = surface->next_geometry.y;
+		surface->geometry.width = surface->next_geometry.width;
+		surface->geometry.height = surface->next_geometry.height;
+	}
+
+	switch (surface->role) {
+	case WLR_XDG_SURFACE_ROLE_NONE:
+		wl_resource_post_error(surface->resource,
+			XDG_SURFACE_ERROR_NOT_CONSTRUCTED,
+			"xdg_surface must have a role");
+		break;
+	case WLR_XDG_SURFACE_ROLE_TOPLEVEL:
+		handle_xdg_surface_toplevel_committed(surface);
+		break;
+	case WLR_XDG_SURFACE_ROLE_POPUP:
+		handle_xdg_surface_popup_committed(surface);
+		break;
+	}
+
+	if (!surface->added) {
+		surface->added = true;
+		wlr_signal_emit_safe(&surface->client->shell->events.new_surface,
+			surface);
+	}
+	if (surface->configured && wlr_surface_has_buffer(surface->surface) &&
+			!surface->mapped) {
+		surface->mapped = true;
+		wlr_signal_emit_safe(&surface->events.map, surface);
+	}
+	if (surface->configured && !wlr_surface_has_buffer(surface->surface) &&
+			surface->mapped) {
+		unmap_xdg_surface(surface);
+	}
+}
+
+static void xdg_surface_handle_surface_destroy(struct wl_listener *listener,
+		void *data) {
+	struct wlr_xdg_surface *xdg_surface =
+		wl_container_of(listener, xdg_surface, surface_destroy_listener);
+	destroy_xdg_surface(xdg_surface);
+}
+
+struct wlr_xdg_surface *create_xdg_surface(
+		struct wlr_xdg_client *client, struct wlr_surface *surface,
+		uint32_t id) {
+	struct wlr_xdg_surface *xdg_surface =
+		calloc(1, sizeof(struct wlr_xdg_surface));
+	if (xdg_surface == NULL) {
+		wl_client_post_no_memory(client->client);
+		return NULL;
+	}
+
+	xdg_surface->client = client;
+	xdg_surface->role = WLR_XDG_SURFACE_ROLE_NONE;
+	xdg_surface->surface = surface;
+	xdg_surface->resource = wl_resource_create(client->client,
+		&xdg_surface_interface, wl_resource_get_version(client->resource),
+		id);
+	if (xdg_surface->resource == NULL) {
+		free(xdg_surface);
+		wl_client_post_no_memory(client->client);
+		return NULL;
+	}
+
+	if (wlr_surface_has_buffer(xdg_surface->surface)) {
+		wl_resource_destroy(xdg_surface->resource);
+		free(xdg_surface);
+		wl_resource_post_error(client->resource,
+			XDG_SURFACE_ERROR_UNCONFIGURED_BUFFER,
+			"xdg_surface must not have a buffer at creation");
+		return NULL;
+	}
+
+	wl_list_init(&xdg_surface->configure_list);
+	wl_list_init(&xdg_surface->popups);
+
+	wl_signal_init(&xdg_surface->events.destroy);
+	wl_signal_init(&xdg_surface->events.ping_timeout);
+	wl_signal_init(&xdg_surface->events.new_popup);
+	wl_signal_init(&xdg_surface->events.map);
+	wl_signal_init(&xdg_surface->events.unmap);
+
+	wl_signal_add(&xdg_surface->surface->events.destroy,
+		&xdg_surface->surface_destroy_listener);
+	xdg_surface->surface_destroy_listener.notify =
+		xdg_surface_handle_surface_destroy;
+
+	wlr_surface_set_role_committed(xdg_surface->surface,
+		handle_surface_committed, xdg_surface);
+
+	wlr_log(L_DEBUG, "new xdg_surface %p (res %p)", xdg_surface,
+		xdg_surface->resource);
+	wl_resource_set_implementation(xdg_surface->resource,
+		&xdg_surface_implementation, xdg_surface,
+		xdg_surface_handle_resource_destroy);
+	wl_list_insert(&client->surfaces, &xdg_surface->link);
+
+	return xdg_surface;
+}
+
+void destroy_xdg_surface(struct wlr_xdg_surface *surface) {
+	if (surface->role != WLR_XDG_SURFACE_ROLE_NONE) {
+		unmap_xdg_surface(surface);
+	}
+
+	wlr_signal_emit_safe(&surface->events.destroy, surface);
+
+	switch (surface->role) {
+	case WLR_XDG_SURFACE_ROLE_TOPLEVEL:
+		destroy_xdg_toplevel(surface);
+		break;
+	case WLR_XDG_SURFACE_ROLE_POPUP:
+		destroy_xdg_popup(surface);
+		break;
+	case WLR_XDG_SURFACE_ROLE_NONE:
+		// This space is intentionally left blank
+		break;
+	}
+
+	wl_resource_set_user_data(surface->resource, NULL);
+	wl_list_remove(&surface->link);
+	wl_list_remove(&surface->surface_destroy_listener.link);
+	wlr_surface_set_role_committed(surface->surface, NULL, NULL);
+	free(surface);
+}
+
+struct wlr_xdg_surface *wlr_xdg_surface_from_resource(
+		struct wl_resource *resource) {
+	// TODO: Double check that all of the callers can deal with NULL
+	if (!resource) {
+		return NULL;
+	}
+	assert(wl_resource_instance_of(resource, &xdg_surface_interface,
+		&xdg_surface_implementation));
+	return wl_resource_get_user_data(resource);
+}
+
+void wlr_xdg_surface_ping(struct wlr_xdg_surface *surface) {
+	if (surface->client->ping_serial != 0) {
+		// already pinged
+		return;
+	}
+
+	surface->client->ping_serial =
+		wl_display_next_serial(wl_client_get_display(surface->client->client));
+	wl_event_source_timer_update(surface->client->ping_timer,
+		surface->client->shell->ping_timeout);
+	xdg_wm_base_send_ping(surface->client->resource,
+		surface->client->ping_serial);
+}
+
+void wlr_xdg_surface_send_close(struct wlr_xdg_surface *surface) {
+	switch (surface->role) {
+	case WLR_XDG_SURFACE_ROLE_NONE:
+		assert(0 && "not reached");
+		break;
+	case WLR_XDG_SURFACE_ROLE_TOPLEVEL:
+		if (surface->toplevel) {
+			xdg_toplevel_send_close(surface->toplevel->resource);
+		}
+		break;
+	case WLR_XDG_SURFACE_ROLE_POPUP:
+		if (surface->popup) {
+			xdg_popup_send_popup_done(surface->popup->resource);
+		}
+		break;
+	}
+}
+
+static void xdg_popup_get_position(struct wlr_xdg_popup *popup,
+		double *popup_sx, double *popup_sy) {
+	struct wlr_xdg_surface *parent =
+		wlr_xdg_surface_from_wlr_surface(popup->parent);
+	*popup_sx = parent->geometry.x + popup->geometry.x -
+		popup->base->geometry.x;
+	*popup_sy = parent->geometry.y + popup->geometry.y -
+		popup->base->geometry.y;
+}
+
+struct wlr_surface *wlr_xdg_surface_surface_at(
+		struct wlr_xdg_surface *surface, double sx, double sy,
+		double *sub_x, double *sub_y) {
+	struct wlr_xdg_popup *popup_state;
+	wl_list_for_each(popup_state, &surface->popups, link) {
+		struct wlr_xdg_surface *popup = popup_state->base;
+
+		double popup_sx, popup_sy;
+		xdg_popup_get_position(popup_state, &popup_sx, &popup_sy);
+
+		struct wlr_surface *sub = wlr_xdg_surface_surface_at(popup,
+			sx - popup_sx,
+			sy - popup_sy,
+			sub_x, sub_y);
+		if (sub != NULL) {
+			return sub;
+		}
+	}
+
+	return wlr_surface_surface_at(surface->surface, sx, sy, sub_x, sub_y);
+}
+
+struct xdg_surface_iterator_data {
+	wlr_surface_iterator_func_t user_iterator;
+	void *user_data;
+	int x, y;
+};
+
+static void xdg_surface_iterator(struct wlr_surface *surface,
+		int sx, int sy, void *data) {
+	struct xdg_surface_iterator_data *iter_data = data;
+	iter_data->user_iterator(surface, iter_data->x + sx, iter_data->y + sy,
+		iter_data->user_data);
+}
+
+static void xdg_surface_for_each_surface(struct wlr_xdg_surface *surface,
+		int x, int y, wlr_surface_iterator_func_t iterator, void *user_data) {
+	struct xdg_surface_iterator_data data = {
+		.user_iterator = iterator,
+		.user_data = user_data,
+		.x = x, .y = y,
+	};
+	wlr_surface_for_each_surface(surface->surface, xdg_surface_iterator,
+		&data);
+
+	struct wlr_xdg_popup *popup_state;
+	wl_list_for_each(popup_state, &surface->popups, link) {
+		struct wlr_xdg_surface *popup = popup_state->base;
+		if (!popup->configured) {
+			continue;
+		}
+
+		double popup_sx, popup_sy;
+		xdg_popup_get_position(popup_state, &popup_sx, &popup_sy);
+
+		xdg_surface_for_each_surface(popup,
+			x + popup_sx,
+			y + popup_sy,
+			iterator, user_data);
+	}
+}
+
+void wlr_xdg_surface_for_each_surface(struct wlr_xdg_surface *surface,
+		wlr_surface_iterator_func_t iterator, void *user_data) {
+	xdg_surface_for_each_surface(surface, 0, 0, iterator, user_data);
+}

types/xdg_shell/wlr_xdg_toplevel.c

@@ -0,0 +1,481 @@
+#define _POSIX_C_SOURCE 200809L
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+#include <wlr/util/log.h>
+#include "types/wlr_xdg_shell.h"
+#include "util/signal.h"
+
+void handle_xdg_toplevel_ack_configure(
+		struct wlr_xdg_surface *surface,
+		struct wlr_xdg_surface_configure *configure) {
+	assert(surface->role == WLR_XDG_SURFACE_ROLE_TOPLEVEL);
+	assert(configure->toplevel_state != NULL);
+
+	surface->toplevel->current.maximized =
+		configure->toplevel_state->maximized;
+	surface->toplevel->current.fullscreen =
+		configure->toplevel_state->fullscreen;
+	surface->toplevel->current.resizing =
+		configure->toplevel_state->resizing;
+	surface->toplevel->current.activated =
+		configure->toplevel_state->activated;
+}
+
+bool compare_xdg_surface_toplevel_state(struct wlr_xdg_toplevel *state) {
+	struct {
+		struct wlr_xdg_toplevel_state state;
+		uint32_t width, height;
+	} configured;
+
+	// is pending state different from current state?
+	if (!state->base->configured) {
+		return false;
+	}
+
+	if (wl_list_empty(&state->base->configure_list)) {
+		// last configure is actually the current state, just use it
+		configured.state = state->current;
+		configured.width = state->base->surface->current->width;
+		configured.height = state->base->surface->current->width;
+	} else {
+		struct wlr_xdg_surface_configure *configure =
+			wl_container_of(state->base->configure_list.prev, configure, link);
+		configured.state = *configure->toplevel_state;
+		configured.width = configure->toplevel_state->width;
+		configured.height = configure->toplevel_state->height;
+	}
+
+	if (state->server_pending.activated != configured.state.activated) {
+		return false;
+	}
+	if (state->server_pending.fullscreen != configured.state.fullscreen) {
+		return false;
+	}
+	if (state->server_pending.maximized != configured.state.maximized) {
+		return false;
+	}
+	if (state->server_pending.resizing != configured.state.resizing) {
+		return false;
+	}
+
+	if (state->server_pending.width == configured.width &&
+			state->server_pending.height == configured.height) {
+		return true;
+	}
+
+	if (state->server_pending.width == 0 && state->server_pending.height == 0) {
+		return true;
+	}
+
+	return false;
+}
+
+void send_xdg_toplevel_configure(struct wlr_xdg_surface *surface,
+		struct wlr_xdg_surface_configure *configure) {
+	assert(surface->role == WLR_XDG_SURFACE_ROLE_TOPLEVEL);
+
+	configure->toplevel_state = malloc(sizeof(*configure->toplevel_state));
+	if (configure->toplevel_state == NULL) {
+		wlr_log(L_ERROR, "Allocation failed");
+		wl_resource_post_no_memory(surface->toplevel->resource);
+		return;
+	}
+	*configure->toplevel_state = surface->toplevel->server_pending;
+
+	uint32_t *s;
+	struct wl_array states;
+	wl_array_init(&states);
+	if (surface->toplevel->server_pending.maximized) {
+		s = wl_array_add(&states, sizeof(uint32_t));
+		if (!s) {
+			wlr_log(L_ERROR, "Could not allocate state for maximized xdg_toplevel");
+			goto error_out;
+		}
+		*s = XDG_TOPLEVEL_STATE_MAXIMIZED;
+	}
+	if (surface->toplevel->server_pending.fullscreen) {
+		s = wl_array_add(&states, sizeof(uint32_t));
+		if (!s) {
+			wlr_log(L_ERROR, "Could not allocate state for fullscreen xdg_toplevel");
+			goto error_out;
+		}
+		*s = XDG_TOPLEVEL_STATE_FULLSCREEN;
+	}
+	if (surface->toplevel->server_pending.resizing) {
+		s = wl_array_add(&states, sizeof(uint32_t));
+		if (!s) {
+			wlr_log(L_ERROR, "Could not allocate state for resizing xdg_toplevel");
+			goto error_out;
+		}
+		*s = XDG_TOPLEVEL_STATE_RESIZING;
+	}
+	if (surface->toplevel->server_pending.activated) {
+		s = wl_array_add(&states, sizeof(uint32_t));
+		if (!s) {
+			wlr_log(L_ERROR, "Could not allocate state for activated xdg_toplevel");
+			goto error_out;
+		}
+		*s = XDG_TOPLEVEL_STATE_ACTIVATED;
+	}
+
+	uint32_t width = surface->toplevel->server_pending.width;
+	uint32_t height = surface->toplevel->server_pending.height;
+	xdg_toplevel_send_configure(surface->toplevel->resource, width, height,
+		&states);
+
+	wl_array_release(&states);
+	return;
+
+error_out:
+	wl_array_release(&states);
+	wl_resource_post_no_memory(surface->toplevel->resource);
+}
+
+void handle_xdg_surface_toplevel_committed(struct wlr_xdg_surface *surface) {
+	assert(surface->role == WLR_XDG_SURFACE_ROLE_TOPLEVEL);
+
+	if (!surface->toplevel->added) {
+		// on the first commit, send a configure request to tell the client it
+		// is added
+		schedule_xdg_surface_configure(surface);
+		surface->toplevel->added = true;
+		return;
+	}
+
+	// update state that doesn't need compositor approval
+	surface->toplevel->current.max_width =
+		surface->toplevel->client_pending.max_width;
+	surface->toplevel->current.min_width =
+		surface->toplevel->client_pending.min_width;
+	surface->toplevel->current.max_height =
+		surface->toplevel->client_pending.max_height;
+	surface->toplevel->current.min_height =
+		surface->toplevel->client_pending.min_height;
+}
+
+static const struct xdg_toplevel_interface xdg_toplevel_implementation;
+
+static struct wlr_xdg_surface *xdg_surface_from_xdg_toplevel_resource(
+		struct wl_resource *resource) {
+	assert(wl_resource_instance_of(resource, &xdg_toplevel_interface,
+		&xdg_toplevel_implementation));
+	return wl_resource_get_user_data(resource);
+}
+
+static void xdg_toplevel_handle_set_parent(struct wl_client *client,
+		struct wl_resource *resource, struct wl_resource *parent_resource) {
+	struct wlr_xdg_surface *surface =
+		xdg_surface_from_xdg_toplevel_resource(resource);
+	struct wlr_xdg_surface *parent = NULL;
+
+	if (parent_resource != NULL) {
+		parent = xdg_surface_from_xdg_toplevel_resource(parent_resource);
+	}
+
+	surface->toplevel->parent = parent;
+}
+
+static void xdg_toplevel_handle_set_title(struct wl_client *client,
+		struct wl_resource *resource, const char *title) {
+	struct wlr_xdg_surface *surface =
+		xdg_surface_from_xdg_toplevel_resource(resource);
+	char *tmp;
+
+	tmp = strdup(title);
+	if (tmp == NULL) {
+		return;
+	}
+
+	free(surface->toplevel->title);
+	surface->toplevel->title = tmp;
+}
+
+static void xdg_toplevel_handle_set_app_id(struct wl_client *client,
+		struct wl_resource *resource, const char *app_id) {
+	struct wlr_xdg_surface *surface =
+		xdg_surface_from_xdg_toplevel_resource(resource);
+	char *tmp;
+
+	tmp = strdup(app_id);
+	if (tmp == NULL) {
+		return;
+	}
+
+	free(surface->toplevel->app_id);
+	surface->toplevel->app_id = tmp;
+}
+
+static void xdg_toplevel_handle_show_window_menu(struct wl_client *client,
+		struct wl_resource *resource, struct wl_resource *seat_resource,
+		uint32_t serial, int32_t x, int32_t y) {
+	struct wlr_xdg_surface *surface =
+		xdg_surface_from_xdg_toplevel_resource(resource);
+	struct wlr_seat_client *seat =
+		wlr_seat_client_from_resource(seat_resource);
+
+	if (!surface->configured) {
+		wl_resource_post_error(surface->toplevel->resource,
+			XDG_SURFACE_ERROR_NOT_CONSTRUCTED,
+			"surface has not been configured yet");
+		return;
+	}
+
+	if (!wlr_seat_validate_grab_serial(seat->seat, serial)) {
+		wlr_log(L_DEBUG, "invalid serial for grab");
+		return;
+	}
+
+	struct wlr_xdg_toplevel_show_window_menu_event event = {
+		.surface = surface,
+		.seat = seat,
+		.serial = serial,
+		.x = x,
+		.y = y,
+	};
+
+	wlr_signal_emit_safe(&surface->toplevel->events.request_show_window_menu, &event);
+}
+
+static void xdg_toplevel_handle_move(struct wl_client *client,
+		struct wl_resource *resource, struct wl_resource *seat_resource,
+		uint32_t serial) {
+	struct wlr_xdg_surface *surface =
+		xdg_surface_from_xdg_toplevel_resource(resource);
+	struct wlr_seat_client *seat =
+		wlr_seat_client_from_resource(seat_resource);
+
+	if (!surface->configured) {
+		wl_resource_post_error(surface->toplevel->resource,
+			XDG_SURFACE_ERROR_NOT_CONSTRUCTED,
+			"surface has not been configured yet");
+		return;
+	}
+
+	if (!wlr_seat_validate_grab_serial(seat->seat, serial)) {
+		wlr_log(L_DEBUG, "invalid serial for grab");
+		return;
+	}
+
+	struct wlr_xdg_toplevel_move_event event = {
+		.surface = surface,
+		.seat = seat,
+		.serial = serial,
+	};
+
+	wlr_signal_emit_safe(&surface->toplevel->events.request_move, &event);
+}
+
+static void xdg_toplevel_handle_resize(struct wl_client *client,
+		struct wl_resource *resource, struct wl_resource *seat_resource,
+		uint32_t serial, uint32_t edges) {
+	struct wlr_xdg_surface *surface =
+		xdg_surface_from_xdg_toplevel_resource(resource);
+	struct wlr_seat_client *seat =
+		wlr_seat_client_from_resource(seat_resource);
+
+	if (!surface->configured) {
+		wl_resource_post_error(surface->toplevel->resource,
+			XDG_SURFACE_ERROR_NOT_CONSTRUCTED,
+			"surface has not been configured yet");
+		return;
+	}
+
+	if (!wlr_seat_validate_grab_serial(seat->seat, serial)) {
+		wlr_log(L_DEBUG, "invalid serial for grab");
+		return;
+	}
+
+	struct wlr_xdg_toplevel_resize_event event = {
+		.surface = surface,
+		.seat = seat,
+		.serial = serial,
+		.edges = edges,
+	};
+
+	wlr_signal_emit_safe(&surface->toplevel->events.request_resize, &event);
+}
+
+static void xdg_toplevel_handle_set_max_size(struct wl_client *client,
+		struct wl_resource *resource, int32_t width, int32_t height) {
+	struct wlr_xdg_surface *surface =
+		xdg_surface_from_xdg_toplevel_resource(resource);
+	surface->toplevel->client_pending.max_width = width;
+	surface->toplevel->client_pending.max_height = height;
+}
+
+static void xdg_toplevel_handle_set_min_size(struct wl_client *client,
+		struct wl_resource *resource, int32_t width, int32_t height) {
+	struct wlr_xdg_surface *surface =
+		xdg_surface_from_xdg_toplevel_resource(resource);
+	surface->toplevel->client_pending.min_width = width;
+	surface->toplevel->client_pending.min_height = height;
+}
+
+static void xdg_toplevel_handle_set_maximized(struct wl_client *client,
+		struct wl_resource *resource) {
+	struct wlr_xdg_surface *surface =
+		xdg_surface_from_xdg_toplevel_resource(resource);
+	surface->toplevel->client_pending.maximized = true;
+	wlr_signal_emit_safe(&surface->toplevel->events.request_maximize, surface);
+}
+
+static void xdg_toplevel_handle_unset_maximized(struct wl_client *client,
+		struct wl_resource *resource) {
+	struct wlr_xdg_surface *surface =
+		xdg_surface_from_xdg_toplevel_resource(resource);
+	surface->toplevel->client_pending.maximized = false;
+	wlr_signal_emit_safe(&surface->toplevel->events.request_maximize, surface);
+}
+
+static void xdg_toplevel_handle_set_fullscreen(struct wl_client *client,
+		struct wl_resource *resource, struct wl_resource *output_resource) {
+	struct wlr_xdg_surface *surface =
+		xdg_surface_from_xdg_toplevel_resource(resource);
+
+	struct wlr_output *output = NULL;
+	if (output_resource != NULL) {
+		output = wlr_output_from_resource(output_resource);
+	}
+
+	surface->toplevel->client_pending.fullscreen = true;
+
+	struct wlr_xdg_toplevel_set_fullscreen_event event = {
+		.surface = surface,
+		.fullscreen = true,
+		.output = output,
+	};
+
+	wlr_signal_emit_safe(&surface->toplevel->events.request_fullscreen, &event);
+}
+
+static void xdg_toplevel_handle_unset_fullscreen(struct wl_client *client,
+		struct wl_resource *resource) {
+	struct wlr_xdg_surface *surface =
+		xdg_surface_from_xdg_toplevel_resource(resource);
+
+	surface->toplevel->client_pending.fullscreen = false;
+
+	struct wlr_xdg_toplevel_set_fullscreen_event event = {
+		.surface = surface,
+		.fullscreen = false,
+		.output = NULL,
+	};
+
+	wlr_signal_emit_safe(&surface->toplevel->events.request_fullscreen, &event);
+}
+
+static void xdg_toplevel_handle_set_minimized(struct wl_client *client,
+		struct wl_resource *resource) {
+	struct wlr_xdg_surface *surface =
+		xdg_surface_from_xdg_toplevel_resource(resource);
+	wlr_signal_emit_safe(&surface->toplevel->events.request_minimize, surface);
+}
+
+static void xdg_toplevel_handle_destroy(struct wl_client *client,
+		struct wl_resource *resource) {
+	wl_resource_destroy(resource);
+}
+
+static const struct xdg_toplevel_interface xdg_toplevel_implementation = {
+	.destroy = xdg_toplevel_handle_destroy,
+	.set_parent = xdg_toplevel_handle_set_parent,
+	.set_title = xdg_toplevel_handle_set_title,
+	.set_app_id = xdg_toplevel_handle_set_app_id,
+	.show_window_menu = xdg_toplevel_handle_show_window_menu,
+	.move = xdg_toplevel_handle_move,
+	.resize = xdg_toplevel_handle_resize,
+	.set_max_size = xdg_toplevel_handle_set_max_size,
+	.set_min_size = xdg_toplevel_handle_set_min_size,
+	.set_maximized = xdg_toplevel_handle_set_maximized,
+	.unset_maximized = xdg_toplevel_handle_unset_maximized,
+	.set_fullscreen = xdg_toplevel_handle_set_fullscreen,
+	.unset_fullscreen = xdg_toplevel_handle_unset_fullscreen,
+	.set_minimized = xdg_toplevel_handle_set_minimized,
+};
+
+static void xdg_toplevel_handle_resource_destroy(struct wl_resource *resource) {
+	struct wlr_xdg_surface *surface =
+		xdg_surface_from_xdg_toplevel_resource(resource);
+	if (surface != NULL) {
+		destroy_xdg_toplevel(surface);
+	}
+}
+
+void create_xdg_toplevel(struct wlr_xdg_surface *xdg_surface,
+		uint32_t id) {
+	if (wlr_surface_set_role(xdg_surface->surface, XDG_TOPLEVEL_ROLE,
+			xdg_surface->resource, XDG_WM_BASE_ERROR_ROLE)) {
+		return;
+	}
+
+	xdg_surface->toplevel = calloc(1, sizeof(struct wlr_xdg_toplevel));
+	if (xdg_surface->toplevel == NULL) {
+		wl_resource_post_no_memory(xdg_surface->resource);
+		return;
+	}
+	wl_signal_init(&xdg_surface->toplevel->events.request_maximize);
+	wl_signal_init(&xdg_surface->toplevel->events.request_fullscreen);
+	wl_signal_init(&xdg_surface->toplevel->events.request_minimize);
+	wl_signal_init(&xdg_surface->toplevel->events.request_move);
+	wl_signal_init(&xdg_surface->toplevel->events.request_resize);
+	wl_signal_init(&xdg_surface->toplevel->events.request_show_window_menu);
+
+	xdg_surface->role = WLR_XDG_SURFACE_ROLE_TOPLEVEL;
+	xdg_surface->toplevel->base = xdg_surface;
+
+	struct wl_resource *toplevel_resource = wl_resource_create(
+		xdg_surface->client->client, &xdg_toplevel_interface,
+		wl_resource_get_version(xdg_surface->resource), id);
+	if (toplevel_resource == NULL) {
+		free(xdg_surface->toplevel);
+		wl_resource_post_no_memory(xdg_surface->resource);
+		return;
+	}
+	wl_resource_set_implementation(toplevel_resource,
+		&xdg_toplevel_implementation, xdg_surface,
+		xdg_toplevel_handle_resource_destroy);
+
+	xdg_surface->toplevel->resource = toplevel_resource;
+}
+
+uint32_t wlr_xdg_toplevel_set_size(struct wlr_xdg_surface *surface,
+		uint32_t width, uint32_t height) {
+	assert(surface->role == WLR_XDG_SURFACE_ROLE_TOPLEVEL);
+	surface->toplevel->server_pending.width = width;
+	surface->toplevel->server_pending.height = height;
+
+	return schedule_xdg_surface_configure(surface);
+}
+
+uint32_t wlr_xdg_toplevel_set_activated(struct wlr_xdg_surface *surface,
+		bool activated) {
+	assert(surface->role == WLR_XDG_SURFACE_ROLE_TOPLEVEL);
+	surface->toplevel->server_pending.activated = activated;
+
+	return schedule_xdg_surface_configure(surface);
+}
+
+uint32_t wlr_xdg_toplevel_set_maximized(struct wlr_xdg_surface *surface,
+		bool maximized) {
+	assert(surface->role == WLR_XDG_SURFACE_ROLE_TOPLEVEL);
+	surface->toplevel->server_pending.maximized = maximized;
+
+	return schedule_xdg_surface_configure(surface);
+}
+
+uint32_t wlr_xdg_toplevel_set_fullscreen(struct wlr_xdg_surface *surface,
+		bool fullscreen) {
+	assert(surface->role == WLR_XDG_SURFACE_ROLE_TOPLEVEL);
+	surface->toplevel->server_pending.fullscreen = fullscreen;
+
+	return schedule_xdg_surface_configure(surface);
+}
+
+uint32_t wlr_xdg_toplevel_set_resizing(struct wlr_xdg_surface *surface,
+		bool resizing) {
+	assert(surface->role == WLR_XDG_SURFACE_ROLE_TOPLEVEL);
+	surface->toplevel->server_pending.resizing = resizing;
+
+	return schedule_xdg_surface_configure(surface);
+}