This is a fork of https://github.com/swaywm/sway that replaces pango with https://codeberg.org/dnkl/fcft for font rendering. Note: do not use the master branch; use one of the fontconfig branches
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#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <wayland-server-core.h>
#include <wlr/types/wlr_layer_shell_v1.h>
#include <wlr/types/wlr_output_damage.h>
#include <wlr/types/wlr_output.h>
#include "log.h"
#include "sway/desktop/transaction.h"
#include "sway/input/cursor.h"
#include "sway/input/input-manager.h"
#include "sway/input/seat.h"
#include "sway/layers.h"
#include "sway/output.h"
#include "sway/server.h"
#include "sway/tree/arrange.h"
#include "sway/tree/workspace.h"
static void apply_exclusive(struct wlr_box *usable_area,
uint32_t anchor, int32_t exclusive,
int32_t margin_top, int32_t margin_right,
int32_t margin_bottom, int32_t margin_left) {
if (exclusive <= 0) {
return;
}
struct {
uint32_t singular_anchor;
uint32_t anchor_triplet;
int *positive_axis;
int *negative_axis;
int margin;
} edges[] = {
// Top
{
.singular_anchor = ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP,
.anchor_triplet =
ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT |
ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT |
ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP,
.positive_axis = &usable_area->y,
.negative_axis = &usable_area->height,
.margin = margin_top,
},
// Bottom
{
.singular_anchor = ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM,
.anchor_triplet =
ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT |
ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT |
ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM,
.positive_axis = NULL,
.negative_axis = &usable_area->height,
.margin = margin_bottom,
},
// Left
{
.singular_anchor = ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT,
.anchor_triplet =
ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT |
ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP |
ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM,
.positive_axis = &usable_area->x,
.negative_axis = &usable_area->width,
.margin = margin_left,
},
// Right
{
.singular_anchor = ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT,
.anchor_triplet =
ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT |
ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP |
ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM,
.positive_axis = NULL,
.negative_axis = &usable_area->width,
.margin = margin_right,
},
};
for (size_t i = 0; i < sizeof(edges) / sizeof(edges[0]); ++i) {
if ((anchor == edges[i].singular_anchor || anchor == edges[i].anchor_triplet)
&& exclusive + edges[i].margin > 0) {
if (edges[i].positive_axis) {
*edges[i].positive_axis += exclusive + edges[i].margin;
}
if (edges[i].negative_axis) {
*edges[i].negative_axis -= exclusive + edges[i].margin;
}
break;
}
}
}
static void arrange_layer(struct sway_output *output, struct wl_list *list,
struct wlr_box *usable_area, bool exclusive) {
struct sway_layer_surface *sway_layer;
struct wlr_box full_area = { 0 };
wlr_output_effective_resolution(output->wlr_output,
&full_area.width, &full_area.height);
wl_list_for_each(sway_layer, list, link) {
struct wlr_layer_surface_v1 *layer = sway_layer->layer_surface;
struct wlr_layer_surface_v1_state *state = &layer->current;
if (exclusive != (state->exclusive_zone > 0)) {
continue;
}
struct wlr_box bounds;
if (state->exclusive_zone == -1) {
bounds = full_area;
} else {
bounds = *usable_area;
}
struct wlr_box box = {
.width = state->desired_width,
.height = state->desired_height
};
// Horizontal axis
const uint32_t both_horiz = ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT
| ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT;
if (box.width == 0) {
box.x = bounds.x;
} else if ((state->anchor & both_horiz) == both_horiz) {
box.x = bounds.x + ((bounds.width / 2) - (box.width / 2));
} else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT)) {
box.x = bounds.x;
} else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT)) {
box.x = bounds.x + (bounds.width - box.width);
} else {
box.x = bounds.x + ((bounds.width / 2) - (box.width / 2));
}
// Vertical axis
const uint32_t both_vert = ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP
| ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM;
if (box.height == 0) {
box.y = bounds.y;
} else if ((state->anchor & both_vert) == both_vert) {
box.y = bounds.y + ((bounds.height / 2) - (box.height / 2));
} else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP)) {
box.y = bounds.y;
} else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM)) {
box.y = bounds.y + (bounds.height - box.height);
} else {
box.y = bounds.y + ((bounds.height / 2) - (box.height / 2));
}
// Margin
if (box.width == 0) {
box.x += state->margin.left;
box.width = bounds.width -
(state->margin.left + state->margin.right);
} else if ((state->anchor & both_horiz) == both_horiz) {
// don't apply margins
} else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT)) {
box.x += state->margin.left;
} else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT)) {
box.x -= state->margin.right;
}
if (box.height == 0) {
box.y += state->margin.top;
box.height = bounds.height -
(state->margin.top + state->margin.bottom);
} else if ((state->anchor & both_vert) == both_vert) {
// don't apply margins
} else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP)) {
box.y += state->margin.top;
} else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM)) {
box.y -= state->margin.bottom;
}
if (!sway_assert(box.width >= 0 && box.height >= 0,
"Expected layer surface to have positive size")) {
continue;
}
// Apply
sway_layer->geo = box;
wlr_surface_get_extends(layer->surface, &sway_layer->extent);
sway_layer->extent.x += box.x;
sway_layer->extent.y += box.y;
apply_exclusive(usable_area, state->anchor, state->exclusive_zone,
state->margin.top, state->margin.right,
state->margin.bottom, state->margin.left);
wlr_layer_surface_v1_configure(layer, box.width, box.height);
}
}
void arrange_layers(struct sway_output *output) {
struct wlr_box usable_area = { 0 };
wlr_output_effective_resolution(output->wlr_output,
&usable_area.width, &usable_area.height);
// Arrange exclusive surfaces from top->bottom
arrange_layer(output, &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY],
&usable_area, true);
arrange_layer(output, &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_TOP],
&usable_area, true);
arrange_layer(output, &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_BOTTOM],
&usable_area, true);
arrange_layer(output, &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_BACKGROUND],
&usable_area, true);
if (memcmp(&usable_area, &output->usable_area,
sizeof(struct wlr_box)) != 0) {
sway_log(SWAY_DEBUG, "Usable area changed, rearranging output");
memcpy(&output->usable_area, &usable_area, sizeof(struct wlr_box));
arrange_output(output);
}
// Arrange non-exclusive surfaces from top->bottom
arrange_layer(output, &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY],
&usable_area, false);
arrange_layer(output, &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_TOP],
&usable_area, false);
arrange_layer(output, &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_BOTTOM],
&usable_area, false);
arrange_layer(output, &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_BACKGROUND],
&usable_area, false);
// Find topmost keyboard interactive layer, if such a layer exists
uint32_t layers_above_shell[] = {
ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY,
ZWLR_LAYER_SHELL_V1_LAYER_TOP,
};
size_t nlayers = sizeof(layers_above_shell) / sizeof(layers_above_shell[0]);
struct sway_layer_surface *layer, *topmost = NULL;
for (size_t i = 0; i < nlayers; ++i) {
wl_list_for_each_reverse(layer,
&output->layers[layers_above_shell[i]], link) {
if (layer->layer_surface->current.keyboard_interactive &&
layer->layer_surface->mapped) {
topmost = layer;
break;
}
}
if (topmost != NULL) {
break;
}
}
struct sway_seat *seat;
wl_list_for_each(seat, &server.input->seats, link) {
if (topmost != NULL) {
seat_set_focus_layer(seat, topmost->layer_surface);
} else if (seat->focused_layer &&
!seat->focused_layer->current.keyboard_interactive) {
seat_set_focus_layer(seat, NULL);
}
}
}
static struct sway_layer_surface *find_mapped_layer_by_client(
struct wl_client *client, struct wlr_output *ignore_output) {
for (int i = 0; i < root->outputs->length; ++i) {
struct sway_output *output = root->outputs->items[i];
if (output->wlr_output == ignore_output) {
continue;
}
// For now we'll only check the overlay layer
struct sway_layer_surface *lsurface;
wl_list_for_each(lsurface,
&output->layers[ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY], link) {
struct wl_resource *resource = lsurface->layer_surface->resource;
if (wl_resource_get_client(resource) == client
&& lsurface->layer_surface->mapped) {
return lsurface;
}
}
}
return NULL;
}
static void handle_output_destroy(struct wl_listener *listener, void *data) {
struct sway_layer_surface *sway_layer =
wl_container_of(listener, sway_layer, output_destroy);
// Determine if this layer is being used by an exclusive client. If it is,
// try and find another layer owned by this client to pass focus to.
struct sway_seat *seat = input_manager_get_default_seat();
struct wl_client *client =
wl_resource_get_client(sway_layer->layer_surface->resource);
bool set_focus = seat->exclusive_client == client;
wl_list_remove(&sway_layer->output_destroy.link);
wl_list_remove(&sway_layer->link);
wl_list_init(&sway_layer->link);
if (set_focus) {
struct sway_layer_surface *layer =
find_mapped_layer_by_client(client, sway_layer->layer_surface->output);
if (layer) {
seat_set_focus_layer(seat, layer->layer_surface);
}
}
sway_layer->layer_surface->output = NULL;
wlr_layer_surface_v1_destroy(sway_layer->layer_surface);
}
static void handle_surface_commit(struct wl_listener *listener, void *data) {
struct sway_layer_surface *layer =
wl_container_of(listener, layer, surface_commit);
struct wlr_layer_surface_v1 *layer_surface = layer->layer_surface;
struct wlr_output *wlr_output = layer_surface->output;
if (wlr_output == NULL) {
return;
}
struct sway_output *output = wlr_output->data;
struct wlr_box old_extent = layer->extent;
arrange_layers(output);
bool extent_changed =
memcmp(&old_extent, &layer->extent, sizeof(struct wlr_box)) != 0;
bool layer_changed = layer->layer != layer_surface->current.layer;
if (layer_changed) {
wl_list_remove(&layer->link);
wl_list_insert(&output->layers[layer_surface->current.layer],
&layer->link);
layer->layer = layer_surface->current.layer;
}
if (extent_changed || layer_changed) {
output_damage_box(output, &old_extent);
output_damage_surface(output, layer->geo.x, layer->geo.y,
layer_surface->surface, true);
} else {
output_damage_surface(output, layer->geo.x, layer->geo.y,
layer_surface->surface, false);
}
transaction_commit_dirty();
}
static void unmap(struct sway_layer_surface *sway_layer) {
struct sway_seat *seat;
wl_list_for_each(seat, &server.input->seats, link) {
if (seat->focused_layer == sway_layer->layer_surface) {
seat_set_focus_layer(seat, NULL);
}
}
cursor_rebase_all();
struct wlr_output *wlr_output = sway_layer->layer_surface->output;
if (wlr_output == NULL) {
return;
}
struct sway_output *output = wlr_output->data;
if (output == NULL) {
return;
}
output_damage_surface(output, sway_layer->geo.x, sway_layer->geo.y,
sway_layer->layer_surface->surface, true);
}
static void handle_destroy(struct wl_listener *listener, void *data) {
struct sway_layer_surface *sway_layer =
wl_container_of(listener, sway_layer, destroy);
sway_log(SWAY_DEBUG, "Layer surface destroyed (%s)",
sway_layer->layer_surface->namespace);
if (sway_layer->layer_surface->mapped) {
unmap(sway_layer);
}
wl_list_remove(&sway_layer->link);
wl_list_remove(&sway_layer->destroy.link);
wl_list_remove(&sway_layer->map.link);
wl_list_remove(&sway_layer->unmap.link);
wl_list_remove(&sway_layer->surface_commit.link);
wl_list_remove(&sway_layer->new_popup.link);
wl_list_remove(&sway_layer->new_subsurface.link);
if (sway_layer->layer_surface->output != NULL) {
struct sway_output *output = sway_layer->layer_surface->output->data;
if (output != NULL) {
arrange_layers(output);
transaction_commit_dirty();
}
wl_list_remove(&sway_layer->output_destroy.link);
sway_layer->layer_surface->output = NULL;
}
free(sway_layer);
}
static void handle_map(struct wl_listener *listener, void *data) {
struct sway_layer_surface *sway_layer = wl_container_of(listener,
sway_layer, map);
struct sway_output *output = sway_layer->layer_surface->output->data;
output_damage_surface(output, sway_layer->geo.x, sway_layer->geo.y,
sway_layer->layer_surface->surface, true);
wlr_surface_send_enter(sway_layer->layer_surface->surface,
sway_layer->layer_surface->output);
cursor_rebase_all();
}
static void handle_unmap(struct wl_listener *listener, void *data) {
struct sway_layer_surface *sway_layer = wl_container_of(
listener, sway_layer, unmap);
unmap(sway_layer);
}
static void subsurface_damage(struct sway_layer_subsurface *subsurface,
bool whole) {
struct sway_layer_surface *layer = subsurface->layer_surface;
struct wlr_output *wlr_output = layer->layer_surface->output;
if (!wlr_output) {
return;
}
struct sway_output *output = wlr_output->data;
int ox = subsurface->wlr_subsurface->current.x + layer->geo.x;
int oy = subsurface->wlr_subsurface->current.y + layer->geo.y;
output_damage_surface(
output, ox, oy, subsurface->wlr_subsurface->surface, whole);
}
static void subsurface_handle_unmap(struct wl_listener *listener, void *data) {
struct sway_layer_subsurface *subsurface =
wl_container_of(listener, subsurface, unmap);
subsurface_damage(subsurface, true);
}
static void subsurface_handle_map(struct wl_listener *listener, void *data) {
struct sway_layer_subsurface *subsurface =
wl_container_of(listener, subsurface, map);
subsurface_damage(subsurface, true);
}
static void subsurface_handle_commit(struct wl_listener *listener, void *data) {
struct sway_layer_subsurface *subsurface =
wl_container_of(listener, subsurface, commit);
subsurface_damage(subsurface, false);
}
static void subsurface_handle_destroy(struct wl_listener *listener,
void *data) {
struct sway_layer_subsurface *subsurface =
wl_container_of(listener, subsurface, destroy);
wl_list_remove(&subsurface->map.link);
wl_list_remove(&subsurface->unmap.link);
wl_list_remove(&subsurface->destroy.link);
wl_list_remove(&subsurface->commit.link);
free(subsurface);
}
static struct sway_layer_subsurface *create_subsurface(
struct wlr_subsurface *wlr_subsurface,
struct sway_layer_surface *layer_surface) {
struct sway_layer_subsurface *subsurface =
calloc(1, sizeof(struct sway_layer_subsurface));
if (subsurface == NULL) {
return NULL;
}
subsurface->wlr_subsurface = wlr_subsurface;
subsurface->layer_surface = layer_surface;
subsurface->map.notify = subsurface_handle_map;
wl_signal_add(&wlr_subsurface->events.map, &subsurface->map);
subsurface->unmap.notify = subsurface_handle_unmap;
wl_signal_add(&wlr_subsurface->events.unmap, &subsurface->unmap);
subsurface->destroy.notify = subsurface_handle_destroy;
wl_signal_add(&wlr_subsurface->events.destroy, &subsurface->destroy);
subsurface->commit.notify = subsurface_handle_commit;
wl_signal_add(&wlr_subsurface->surface->events.commit, &subsurface->commit);
return subsurface;
}
static void handle_new_subsurface(struct wl_listener *listener, void *data) {
struct sway_layer_surface *sway_layer_surface =
wl_container_of(listener, sway_layer_surface, new_subsurface);
struct wlr_subsurface *wlr_subsurface = data;
create_subsurface(wlr_subsurface, sway_layer_surface);
}
static struct sway_layer_surface *popup_get_layer(
struct sway_layer_popup *popup) {
while (popup->parent_type == LAYER_PARENT_POPUP) {
popup = popup->parent_popup;
}
return popup->parent_layer;
}
static void popup_damage(struct sway_layer_popup *layer_popup, bool whole) {
struct wlr_xdg_popup *popup = layer_popup->wlr_popup;
struct wlr_surface *surface = popup->base->surface;
int popup_sx = popup->geometry.x - popup->base->geometry.x;
int popup_sy = popup->geometry.y - popup->base->geometry.y;
int ox = popup_sx, oy = popup_sy;
struct sway_layer_surface *layer;
while (true) {
if (layer_popup->parent_type == LAYER_PARENT_POPUP) {
layer_popup = layer_popup->parent_popup;
ox += layer_popup->wlr_popup->geometry.x;
oy += layer_popup->wlr_popup->geometry.y;
} else {
layer = layer_popup->parent_layer;
ox += layer->geo.x;
oy += layer->geo.y;
break;
}
}
struct wlr_output *wlr_output = layer->layer_surface->output;
struct sway_output *output = wlr_output->data;
output_damage_surface(output, ox, oy, surface, whole);
}
static void popup_handle_map(struct wl_listener *listener, void *data) {
struct sway_layer_popup *popup = wl_container_of(listener, popup, map);
struct sway_layer_surface *layer = popup_get_layer(popup);
struct wlr_output *wlr_output = layer->layer_surface->output;
wlr_surface_send_enter(popup->wlr_popup->base->surface, wlr_output);
popup_damage(popup, true);
}
static void popup_handle_unmap(struct wl_listener *listener, void *data) {
struct sway_layer_popup *popup = wl_container_of(listener, popup, unmap);
popup_damage(popup, true);
}
static void popup_handle_commit(struct wl_listener *listener, void *data) {
struct sway_layer_popup *popup = wl_container_of(listener, popup, commit);
popup_damage(popup, false);
}
static void popup_handle_destroy(struct wl_listener *listener, void *data) {
struct sway_layer_popup *popup =
wl_container_of(listener, popup, destroy);
wl_list_remove(&popup->map.link);
wl_list_remove(&popup->unmap.link);
wl_list_remove(&popup->destroy.link);
wl_list_remove(&popup->commit.link);
free(popup);
}
static void popup_unconstrain(struct sway_layer_popup *popup) {
struct sway_layer_surface *layer = popup_get_layer(popup);
struct wlr_xdg_popup *wlr_popup = popup->wlr_popup;
struct sway_output *output = layer->layer_surface->output->data;
// the output box expressed in the coordinate system of the toplevel parent
// of the popup
struct wlr_box output_toplevel_sx_box = {
.x = -layer->geo.x,
.y = -layer->geo.y,
.width = output->width,
.height = output->height,
};
wlr_xdg_popup_unconstrain_from_box(wlr_popup, &output_toplevel_sx_box);
}
static void popup_handle_new_popup(struct wl_listener *listener, void *data);
static struct sway_layer_popup *create_popup(struct wlr_xdg_popup *wlr_popup,
enum layer_parent parent_type, void *parent) {
struct sway_layer_popup *popup =
calloc(1, sizeof(struct sway_layer_popup));
if (popup == NULL) {
return NULL;
}
popup->wlr_popup = wlr_popup;
popup->parent_type = parent_type;
popup->parent_layer = parent;
popup->map.notify = popup_handle_map;
wl_signal_add(&wlr_popup->base->events.map, &popup->map);
popup->unmap.notify = popup_handle_unmap;
wl_signal_add(&wlr_popup->base->events.unmap, &popup->unmap);
popup->destroy.notify = popup_handle_destroy;
wl_signal_add(&wlr_popup->base->events.destroy, &popup->destroy);
popup->commit.notify = popup_handle_commit;
wl_signal_add(&wlr_popup->base->surface->events.commit, &popup->commit);
popup->new_popup.notify = popup_handle_new_popup;
wl_signal_add(&wlr_popup->base->events.new_popup, &popup->new_popup);
popup_unconstrain(popup);
return popup;
}
static void popup_handle_new_popup(struct wl_listener *listener, void *data) {
struct sway_layer_popup *sway_layer_popup =
wl_container_of(listener, sway_layer_popup, new_popup);
struct wlr_xdg_popup *wlr_popup = data;
create_popup(wlr_popup, LAYER_PARENT_POPUP, sway_layer_popup);
}
static void handle_new_popup(struct wl_listener *listener, void *data) {
struct sway_layer_surface *sway_layer_surface =
wl_container_of(listener, sway_layer_surface, new_popup);
struct wlr_xdg_popup *wlr_popup = data;
create_popup(wlr_popup, LAYER_PARENT_LAYER, sway_layer_surface);
}
struct sway_layer_surface *layer_from_wlr_layer_surface_v1(
struct wlr_layer_surface_v1 *layer_surface) {
return layer_surface->data;
}
void handle_layer_shell_surface(struct wl_listener *listener, void *data) {
struct wlr_layer_surface_v1 *layer_surface = data;
sway_log(SWAY_DEBUG, "new layer surface: namespace %s layer %d anchor %" PRIu32
" size %" PRIu32 "x%" PRIu32 " margin %" PRIu32 ",%" PRIu32 ",%" PRIu32 ",%" PRIu32 ",",
layer_surface->namespace,
layer_surface->client_pending.layer,
layer_surface->client_pending.anchor,
layer_surface->client_pending.desired_width,
layer_surface->client_pending.desired_height,
layer_surface->client_pending.margin.top,
layer_surface->client_pending.margin.right,
layer_surface->client_pending.margin.bottom,
layer_surface->client_pending.margin.left);
if (!layer_surface->output) {
// Assign last active output
struct sway_output *output = NULL;
struct sway_seat *seat = input_manager_get_default_seat();
if (seat) {
struct sway_workspace *ws = seat_get_focused_workspace(seat);
if (ws != NULL) {
output = ws->output;
}
}
if (!output || output == root->noop_output) {
if (!root->outputs->length) {
sway_log(SWAY_ERROR,
"no output to auto-assign layer surface '%s' to",
layer_surface->namespace);
wlr_layer_surface_v1_destroy(layer_surface);
return;
}
output = root->outputs->items[0];
}
layer_surface->output = output->wlr_output;
}
struct sway_layer_surface *sway_layer =
calloc(1, sizeof(struct sway_layer_surface));
if (!sway_layer) {
return;
}
sway_layer->surface_commit.notify = handle_surface_commit;
wl_signal_add(&layer_surface->surface->events.commit,
&sway_layer->surface_commit);
sway_layer->destroy.notify = handle_destroy;
wl_signal_add(&layer_surface->events.destroy, &sway_layer->destroy);
sway_layer->map.notify = handle_map;
wl_signal_add(&layer_surface->events.map, &sway_layer->map);
sway_layer->unmap.notify = handle_unmap;
wl_signal_add(&layer_surface->events.unmap, &sway_layer->unmap);
sway_layer->new_popup.notify = handle_new_popup;
wl_signal_add(&layer_surface->events.new_popup, &sway_layer->new_popup);
sway_layer->new_subsurface.notify = handle_new_subsurface;
wl_signal_add(&layer_surface->surface->events.new_subsurface,
&sway_layer->new_subsurface);
sway_layer->layer_surface = layer_surface;
layer_surface->data = sway_layer;
struct sway_output *output = layer_surface->output->data;
sway_layer->output_destroy.notify = handle_output_destroy;
wl_signal_add(&output->events.destroy, &sway_layer->output_destroy);
wl_list_insert(&output->layers[layer_surface->client_pending.layer],
&sway_layer->link);
// Temporarily set the layer's current state to client_pending
// So that we can easily arrange it
struct wlr_layer_surface_v1_state old_state = layer_surface->current;
layer_surface->current = layer_surface->client_pending;
arrange_layers(output);
layer_surface->current = old_state;
}