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shell.c

/*
 * Copyright © 2010 Intel Corporation
 *
 * Permission to use, copy, modify, distribute, and sell this software and
 * its documentation for any purpose is hereby granted without fee, provided
 * that the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of the copyright holders not be used in
 * advertising or publicity pertaining to distribution of the software
 * without specific, written prior permission.  The copyright holders make
 * no representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
 * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
 * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
 * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <linux/input.h>

#include "wayland-server.h"
#include "compositor.h"

00031 struct wl_shell {
      struct wl_object object;
      struct wlsc_shell shell;
};

00036 struct wlsc_move_grab {
      struct wl_grab grab;
      struct wlsc_surface *surface;
      int32_t dx, dy;
};

static void
move_grab_motion(struct wl_grab *grab,
               uint32_t time, int32_t x, int32_t y)
{
      struct wlsc_move_grab *move = (struct wlsc_move_grab *) grab;
      struct wlsc_surface *es = move->surface;

      wlsc_surface_configure(es, x + move->dx, y + move->dy,
                         es->width, es->height);
}

static void
move_grab_button(struct wl_grab *grab,
             uint32_t time, int32_t button, int32_t state)
{
}

static void
move_grab_end(struct wl_grab *grab, uint32_t time)
{
      struct wlsc_surface *es;
      struct wl_input_device *device = grab->input_device;
      int32_t sx, sy;

      es = pick_surface(grab->input_device, &sx, &sy);
      wl_input_device_set_pointer_focus(device,
                                &es->surface, time,
                                device->x, device->y, sx, sy);
      free(grab);
}

static const struct wl_grab_interface move_grab_interface = {
      move_grab_motion,
      move_grab_button,
      move_grab_end
};

static void
shell_move(struct wl_client *client, struct wl_shell *shell,
         struct wl_surface *surface,
         struct wl_input_device *device, uint32_t time)
{
      struct wlsc_input_device *wd = (struct wlsc_input_device *) device;
      struct wlsc_surface *es = (struct wlsc_surface *) surface;
      struct wlsc_move_grab *move;

      /* FIXME: Reject if fullscreen */

      move = malloc(sizeof *move);
      if (!move) {
            wl_client_post_no_memory(client);
            return;
      }

      move->grab.interface = &move_grab_interface;
      move->dx = es->x - wd->input_device.grab_x;
      move->dy = es->y - wd->input_device.grab_y;
      move->surface = es;

      if (wl_input_device_update_grab(&wd->input_device,
                              &move->grab, surface, time) < 0)
            return;

      wlsc_input_device_set_pointer_image(wd, WLSC_POINTER_DRAGGING);
      wl_input_device_set_pointer_focus(device, NULL, time, 0, 0, 0, 0);
}

00109 struct wlsc_resize_grab {
      struct wl_grab grab;
      uint32_t edges;
      int32_t dx, dy, width, height;
      struct wlsc_surface *surface;
      struct wl_shell *shell;
};

static void
resize_grab_motion(struct wl_grab *grab,
               uint32_t time, int32_t x, int32_t y)
{
      struct wlsc_resize_grab *resize = (struct wlsc_resize_grab *) grab;
      struct wl_input_device *device = grab->input_device;
      struct wl_surface *surface = &resize->surface->surface;
      int32_t width, height;

      if (resize->edges & WL_SHELL_RESIZE_LEFT) {
            width = device->grab_x - x + resize->width;
      } else if (resize->edges & WL_SHELL_RESIZE_RIGHT) {
            width = x - device->grab_x + resize->width;
      } else {
            width = resize->width;
      }

      if (resize->edges & WL_SHELL_RESIZE_TOP) {
            height = device->grab_y - y + resize->height;
      } else if (resize->edges & WL_SHELL_RESIZE_BOTTOM) {
            height = y - device->grab_y + resize->height;
      } else {
            height = resize->height;
      }

      wl_client_post_event(surface->client, &resize->shell->object,
                       WL_SHELL_CONFIGURE, time, resize->edges,
                       surface, width, height);
}

static void
resize_grab_button(struct wl_grab *grab,
               uint32_t time, int32_t button, int32_t state)
{
}

static void
resize_grab_end(struct wl_grab *grab, uint32_t time)
{
      struct wlsc_surface *es;
      struct wl_input_device *device = grab->input_device;
      int32_t sx, sy;

      es = pick_surface(grab->input_device, &sx, &sy);
      wl_input_device_set_pointer_focus(device,
                                &es->surface, time,
                                device->x, device->y, sx, sy);
      free(grab);
}

static const struct wl_grab_interface resize_grab_interface = {
      resize_grab_motion,
      resize_grab_button,
      resize_grab_end
};

static void
shell_resize(struct wl_client *client, struct wl_shell *shell,
           struct wl_surface *surface,
           struct wl_input_device *device, uint32_t time, uint32_t edges)
{
      struct wlsc_input_device *wd = (struct wlsc_input_device *) device;
      struct wlsc_resize_grab *resize;
      enum wlsc_pointer_type pointer = WLSC_POINTER_LEFT_PTR;
      struct wlsc_surface *es = (struct wlsc_surface *) surface;

      /* FIXME: Reject if fullscreen */

      resize = malloc(sizeof *resize);
      if (!resize) {
            wl_client_post_no_memory(client);
            return;
      }

      resize->grab.interface = &resize_grab_interface;
      resize->edges = edges;
      resize->dx = es->x - wd->input_device.grab_x;
      resize->dy = es->y - wd->input_device.grab_y;
      resize->width = es->width;
      resize->height = es->height;
      resize->surface = es;
      resize->shell = shell;

      if (edges == 0 || edges > 15 ||
          (edges & 3) == 3 || (edges & 12) == 12)
            return;

      switch (edges) {
      case WL_SHELL_RESIZE_TOP:
            pointer = WLSC_POINTER_TOP;
            break;
      case WL_SHELL_RESIZE_BOTTOM:
            pointer = WLSC_POINTER_BOTTOM;
            break;
      case WL_SHELL_RESIZE_LEFT:
            pointer = WLSC_POINTER_LEFT;
            break;
      case WL_SHELL_RESIZE_TOP_LEFT:
            pointer = WLSC_POINTER_TOP_LEFT;
            break;
      case WL_SHELL_RESIZE_BOTTOM_LEFT:
            pointer = WLSC_POINTER_BOTTOM_LEFT;
            break;
      case WL_SHELL_RESIZE_RIGHT:
            pointer = WLSC_POINTER_RIGHT;
            break;
      case WL_SHELL_RESIZE_TOP_RIGHT:
            pointer = WLSC_POINTER_TOP_RIGHT;
            break;
      case WL_SHELL_RESIZE_BOTTOM_RIGHT:
            pointer = WLSC_POINTER_BOTTOM_RIGHT;
            break;
      }

      if (wl_input_device_update_grab(&wd->input_device,
                              &resize->grab, surface, time) < 0)
            return;

      wlsc_input_device_set_pointer_image(wd, pointer);
      wl_input_device_set_pointer_focus(device, NULL, time, 0, 0, 0, 0);
}

static void
shell_set_toplevel(struct wl_client *client,
               struct wl_shell *wl_shell,
               struct wl_surface *surface)

{
      struct wlsc_surface *es = (struct wlsc_surface *) surface;
      struct wlsc_compositor *ec = es->compositor;

      if (es->map_type == WLSC_SURFACE_MAP_FULLSCREEN) {
            es->x = es->saved_x;
            es->y = es->saved_y;
      } else if (es->map_type == WLSC_SURFACE_MAP_UNMAPPED) {
            es->x = 10 + random() % 400;
            es->y = 10 + random() % 400;
            /* assign to first output */
            es->output = container_of(ec->output_list.next,
                                struct wlsc_output, link);
      }

      wlsc_surface_damage(es);
      es->map_type = WLSC_SURFACE_MAP_TOPLEVEL;
      es->fullscreen_output = NULL;
}

static void
shell_set_transient(struct wl_client *client,
                struct wl_shell *wl_shell,
                struct wl_surface *surface,
                struct wl_surface *parent,
                int x, int y, uint32_t flags)
{
      struct wlsc_surface *es = (struct wlsc_surface *) surface;
      struct wlsc_surface *pes = (struct wlsc_surface *) parent;

      /* assign to parents output  */
      es->output = pes->output;
 
      es->x = pes->x + x;
      es->y = pes->y + y;

      wlsc_surface_damage(es);
      es->map_type = WLSC_SURFACE_MAP_TRANSIENT;
}

static void
shell_set_fullscreen(struct wl_client *client,
                 struct wl_shell *wl_shell,
                 struct wl_surface *surface)

{
      struct wlsc_surface *es = (struct wlsc_surface *) surface;
      struct wlsc_output *output;

      /* FIXME: Fullscreen on first output */
      /* FIXME: Handle output going away */
      output = container_of(es->compositor->output_list.next,
                        struct wlsc_output, link);
      es->output = output;

      es->saved_x = es->x;
      es->saved_y = es->y;
      es->x = (output->current->width - es->width) / 2;
      es->y = (output->current->height - es->height) / 2;
      es->fullscreen_output = output;
      wlsc_surface_damage(es);
      es->map_type = WLSC_SURFACE_MAP_FULLSCREEN;
}

static void
destroy_drag(struct wl_resource *resource, struct wl_client *client)
{
      struct wl_drag *drag =
            container_of(resource, struct wl_drag, resource);

      wl_list_remove(&drag->drag_focus_listener.link);
      if (drag->grab.input_device)
            wl_input_device_end_grab(drag->grab.input_device,
                               wlsc_compositor_get_time());

      free(drag);
}


static void
wl_drag_set_pointer_focus(struct wl_drag *drag,
                    struct wl_surface *surface, uint32_t time,
                    int32_t x, int32_t y, int32_t sx, int32_t sy)
{
      char **p, **end;

      if (drag->drag_focus == surface)
            return;

      if (drag->drag_focus &&
          (!surface || drag->drag_focus->client != surface->client))
            wl_client_post_event(drag->drag_focus->client,
                              &drag->drag_offer.object,
                              WL_DRAG_OFFER_POINTER_FOCUS,
                              time, NULL, 0, 0, 0, 0);

      if (surface &&
          (!drag->drag_focus ||
           drag->drag_focus->client != surface->client)) {
            wl_client_post_global(surface->client,
                              &drag->drag_offer.object);

            end = drag->types.data + drag->types.size;
            for (p = drag->types.data; p < end; p++)
                  wl_client_post_event(surface->client,
                                    &drag->drag_offer.object,
                                    WL_DRAG_OFFER_OFFER, *p);
      }

      if (surface) {
            wl_client_post_event(surface->client,
                             &drag->drag_offer.object,
                             WL_DRAG_OFFER_POINTER_FOCUS,
                             time, surface,
                             x, y, sx, sy);

      }

      drag->drag_focus = surface;
      drag->pointer_focus_time = time;
      drag->target = NULL;

      wl_list_remove(&drag->drag_focus_listener.link);
      if (surface)
            wl_list_insert(surface->resource.destroy_listener_list.prev,
                         &drag->drag_focus_listener.link);
}

static void
drag_offer_accept(struct wl_client *client,
              struct wl_drag_offer *offer, uint32_t time, const char *type)
{
      struct wl_drag *drag = container_of(offer, struct wl_drag, drag_offer);
      char **p, **end;

      /* If the client responds to drag pointer_focus or motion
       * events after the pointer has left the surface, we just
       * discard the accept requests.  The drag source just won't
       * get the corresponding 'target' events and eventually the
       * next surface/root will start sending events. */
      if (time < drag->pointer_focus_time)
            return;

      drag->target = client;
      drag->type = NULL;
      end = drag->types.data + drag->types.size;
      for (p = drag->types.data; p < end; p++)
            if (type && strcmp(*p, type) == 0)
                  drag->type = *p;

      wl_client_post_event(drag->source->client, &drag->resource.object,
                       WL_DRAG_TARGET, drag->type);
}

static void
drag_offer_receive(struct wl_client *client,
               struct wl_drag_offer *offer, int fd)
{
      struct wl_drag *drag = container_of(offer, struct wl_drag, drag_offer);

      wl_client_post_event(drag->source->client, &drag->resource.object,
                       WL_DRAG_FINISH, fd);
      close(fd);
}

static void
drag_offer_reject(struct wl_client *client, struct wl_drag_offer *offer)
{
      struct wl_drag *drag = container_of(offer, struct wl_drag, drag_offer);

      wl_client_post_event(drag->source->client, &drag->resource.object,
                       WL_DRAG_REJECT);
}

static const struct wl_drag_offer_interface drag_offer_interface = {
      drag_offer_accept,
      drag_offer_receive,
      drag_offer_reject
};

static void
drag_offer(struct wl_client *client, struct wl_drag *drag, const char *type)
{
      char **p;

      p = wl_array_add(&drag->types, sizeof *p);
      if (p)
            *p = strdup(type);
      if (!p || !*p)
            wl_client_post_no_memory(client);
}

static void
drag_grab_motion(struct wl_grab *grab,
               uint32_t time, int32_t x, int32_t y)
{
      struct wl_drag *drag = container_of(grab, struct wl_drag, grab);
      struct wlsc_surface *es;
      int32_t sx, sy;

      es = pick_surface(grab->input_device, &sx, &sy);
      wl_drag_set_pointer_focus(drag, &es->surface, time, x, y, sx, sy);
      if (es)
            wl_client_post_event(es->surface.client,
                             &drag->drag_offer.object,
                             WL_DRAG_OFFER_MOTION,
                             time, x, y, sx, sy);
}

static void
drag_grab_button(struct wl_grab *grab,
             uint32_t time, int32_t button, int32_t state)
{
}

static void
drag_grab_end(struct wl_grab *grab, uint32_t time)
{
      struct wl_drag *drag = container_of(grab, struct wl_drag, grab);
      struct wlsc_surface *es;
      struct wl_input_device *device = grab->input_device;
      int32_t sx, sy;

      if (drag->target)
            wl_client_post_event(drag->target,
                             &drag->drag_offer.object,
                             WL_DRAG_OFFER_DROP);

      wl_drag_set_pointer_focus(drag, NULL, time, 0, 0, 0, 0);

      es = pick_surface(grab->input_device, &sx, &sy);
      wl_input_device_set_pointer_focus(device,
                                &es->surface, time,
                                device->x, device->y, sx, sy);
}

static const struct wl_grab_interface drag_grab_interface = {
      drag_grab_motion,
      drag_grab_button,
      drag_grab_end
};

static void
drag_activate(struct wl_client *client,
            struct wl_drag *drag,
            struct wl_surface *surface,
            struct wl_input_device *device, uint32_t time)
{
      struct wl_display *display = wl_client_get_display (client);
      struct wlsc_surface *target;
      int32_t sx, sy;

      if (wl_input_device_update_grab(device,
                              &drag->grab, surface, time) < 0)
            return;

      drag->grab.interface = &drag_grab_interface;

      drag->source = surface;

      drag->drag_offer.object.interface = &wl_drag_offer_interface;
      drag->drag_offer.object.implementation =
            (void (**)(void)) &drag_offer_interface;

      wl_display_add_object(display, &drag->drag_offer.object);

      target = pick_surface(device, &sx, &sy);
      wl_input_device_set_pointer_focus(device, NULL, time, 0, 0, 0, 0);
      wl_drag_set_pointer_focus(drag, &target->surface, time,
                          device->x, device->y, sx, sy);
}

static void
drag_destroy(struct wl_client *client, struct wl_drag *drag)
{
      wl_resource_destroy(&drag->resource, client,
                      wlsc_compositor_get_time());
}

static const struct wl_drag_interface drag_interface = {
      drag_offer,
      drag_activate,
      drag_destroy,
};

static void
drag_handle_surface_destroy(struct wl_listener *listener,
                      struct wl_resource *resource, uint32_t time)
{
      struct wl_drag *drag =
            container_of(listener, struct wl_drag, drag_focus_listener);
      struct wl_surface *surface = (struct wl_surface *) resource;

      if (drag->drag_focus == surface)
            wl_drag_set_pointer_focus(drag, NULL, time, 0, 0, 0, 0);
}

static void
shell_create_drag(struct wl_client *client,
              struct wl_shell *shell, uint32_t id)
{
      struct wl_drag *drag;

      drag = malloc(sizeof *drag);
      if (drag == NULL) {
            wl_client_post_no_memory(client);
            return;
      }

      memset(drag, 0, sizeof *drag);
      drag->resource.object.id = id;
      drag->resource.object.interface = &wl_drag_interface;
      drag->resource.object.implementation =
            (void (**)(void)) &drag_interface;

      drag->resource.destroy = destroy_drag;

      drag->drag_focus_listener.func = drag_handle_surface_destroy;
      wl_list_init(&drag->drag_focus_listener.link);

      wl_client_add_resource(client, &drag->resource);
}

static void
wlsc_selection_set_focus(struct wlsc_shell *shell,
                   struct wl_selection *selection,
                   struct wl_surface *surface, uint32_t time)
{
      char **p, **end;

      if (selection->selection_focus == surface)
            return;

      if (selection->selection_focus != NULL)
            wl_client_post_event(selection->selection_focus->client,
                             &selection->selection_offer.object,
                             WL_SELECTION_OFFER_KEYBOARD_FOCUS,
                             NULL);

      if (surface) {
            wl_client_post_global(surface->client,
                              &selection->selection_offer.object);

            end = selection->types.data + selection->types.size;
            for (p = selection->types.data; p < end; p++)
                  wl_client_post_event(surface->client,
                                   &selection->selection_offer.object,
                                   WL_SELECTION_OFFER_OFFER, *p);

            wl_list_remove(&selection->selection_focus_listener.link);
            wl_list_insert(surface->resource.destroy_listener_list.prev,
                         &selection->selection_focus_listener.link);

            wl_client_post_event(surface->client,
                             &selection->selection_offer.object,
                             WL_SELECTION_OFFER_KEYBOARD_FOCUS,
                             selection->input_device);
      }

      selection->selection_focus = surface;

      wl_list_remove(&selection->selection_focus_listener.link);
      if (surface)
            wl_list_insert(surface->resource.destroy_listener_list.prev,
                         &selection->selection_focus_listener.link);
}

static void
selection_offer_receive(struct wl_client *client,
                  struct wl_selection_offer *offer,
                  const char *mime_type, int fd)
{
      struct wl_selection *selection =
            container_of(offer, struct wl_selection, selection_offer);

      wl_client_post_event(selection->client,
                       &selection->resource.object,
                       WL_SELECTION_SEND, mime_type, fd);
      close(fd);
}

static const struct wl_selection_offer_interface selection_offer_interface = {
      selection_offer_receive
};

static void
selection_offer(struct wl_client *client,
            struct wl_selection *selection, const char *type)
{
      char **p;

      p = wl_array_add(&selection->types, sizeof *p);
      if (p)
            *p = strdup(type);
      if (!p || !*p)
            wl_client_post_no_memory(client);
}

static void
selection_activate(struct wl_client *client,
               struct wl_selection *selection,
               struct wl_input_device *device, uint32_t time)
{
      struct wlsc_input_device *wd = (struct wlsc_input_device *) device;
      struct wl_display *display = wl_client_get_display (client);
      struct wlsc_compositor *compositor =
            (struct wlsc_compositor *) device->compositor;

      selection->input_device = device;

      selection->selection_offer.object.interface =
            &wl_selection_offer_interface;
      selection->selection_offer.object.implementation =
            (void (**)(void)) &selection_offer_interface;

      wl_display_add_object(display, &selection->selection_offer.object);

      if (wd->selection) {
            wl_client_post_event(wd->selection->client,
                             &wd->selection->resource.object,
                             WL_SELECTION_CANCELLED);
      }
      wd->selection = selection;

      wlsc_selection_set_focus(compositor->shell,
                         selection, device->keyboard_focus, time);
}

static void
selection_destroy(struct wl_client *client, struct wl_selection *selection)
{
      wl_resource_destroy(&selection->resource, client,
                      wlsc_compositor_get_time());
}

static const struct wl_selection_interface selection_interface = {
      selection_offer,
      selection_activate,
      selection_destroy
};

static void
destroy_selection(struct wl_resource *resource, struct wl_client *client)
{
      struct wl_selection *selection =
            container_of(resource, struct wl_selection, resource);
      struct wlsc_input_device *wd =
            (struct wlsc_input_device *) selection->input_device;
      struct wlsc_compositor *compositor =
            (struct wlsc_compositor *) wd->input_device.compositor;

      if (wd && wd->selection == selection) {
            wd->selection = NULL;
            wlsc_selection_set_focus(compositor->shell, 
                               selection, NULL,
                               wlsc_compositor_get_time());
      }

      wl_list_remove(&selection->selection_focus_listener.link);
      free(selection);
}

static void
selection_handle_surface_destroy(struct wl_listener *listener,
                         struct wl_resource *resource, uint32_t time)
{
}

static void
shell_create_selection(struct wl_client *client,
                   struct wl_shell *shell, uint32_t id)
{
      struct wl_selection *selection;

      selection = malloc(sizeof *selection);
      if (selection == NULL) {
            wl_client_post_no_memory(client);
            return;
      }

      memset(selection, 0, sizeof *selection);
      selection->resource.object.id = id;
      selection->resource.object.interface = &wl_selection_interface;
      selection->resource.object.implementation =
            (void (**)(void)) &selection_interface;

      selection->client = client;
      selection->resource.destroy = destroy_selection;
      selection->selection_focus = NULL;

      selection->selection_focus_listener.func =
            selection_handle_surface_destroy;
      wl_list_init(&selection->selection_focus_listener.link);

      wl_client_add_resource(client, &selection->resource);
}

const static struct wl_shell_interface shell_interface = {
      shell_move,
      shell_resize,
      shell_create_drag,
      shell_create_selection,
      shell_set_toplevel,
      shell_set_transient,
      shell_set_fullscreen
};

static void
move_binding(struct wl_input_device *device, uint32_t time,
           uint32_t key, uint32_t button, uint32_t state, void *data)
{
      struct wl_shell *shell = data;
      struct wlsc_surface *surface =
            (struct wlsc_surface *) device->pointer_focus;

      if (surface == NULL)
            return;

      shell_move(NULL, shell, &surface->surface, device, time);
}

static void
resize_binding(struct wl_input_device *device, uint32_t time,
             uint32_t key, uint32_t button, uint32_t state, void *data)
{
      struct wl_shell *shell = data;
      struct wlsc_surface *surface =
            (struct wlsc_surface *) device->pointer_focus;
      uint32_t edges = 0;
      int32_t x, y;

      if (surface == NULL)
            return;

      x = device->grab_x - surface->x;
      y = device->grab_y - surface->y;

      if (x < surface->width / 3)
            edges |= WL_SHELL_RESIZE_LEFT;
      else if (x < 2 * surface->width / 3)
            edges |= 0;
      else
            edges |= WL_SHELL_RESIZE_RIGHT;

      if (y < surface->height / 3)
            edges |= WL_SHELL_RESIZE_TOP;
      else if (y < 2 * surface->height / 3)
            edges |= 0;
      else
            edges |= WL_SHELL_RESIZE_BOTTOM;

      shell_resize(NULL, shell, &surface->surface, device, time, edges);
}

static void
lock(struct wlsc_shell *shell)
{
}

static void
attach(struct wlsc_shell *shell, struct wlsc_surface *es)
{
      if (es->map_type == WLSC_SURFACE_MAP_FULLSCREEN) {
            es->x = (es->fullscreen_output->current->width - es->width) / 2;
            es->y = (es->fullscreen_output->current->height - es->height) / 2;
      }
}

int
shell_init(struct wlsc_compositor *ec);

WL_EXPORT int
shell_init(struct wlsc_compositor *ec)
{
      struct wl_shell *shell;

      shell = malloc(sizeof *shell);
      if (shell == NULL)
            return -1;

      shell->shell.lock = lock;
      shell->shell.attach = attach;
      shell->shell.set_selection_focus = wlsc_selection_set_focus;

      shell->object.interface = &wl_shell_interface;
      shell->object.implementation = (void (**)(void)) &shell_interface;
      wl_display_add_object(ec->wl_display, &shell->object);
      if (wl_display_add_global(ec->wl_display, &shell->object, NULL))
            return -1;

      wlsc_compositor_add_binding(ec, 0, BTN_LEFT, MODIFIER_SUPER,
                            move_binding, shell);
      wlsc_compositor_add_binding(ec, 0, BTN_MIDDLE, MODIFIER_SUPER,
                            resize_binding, shell);

      ec->shell = &shell->shell;

      return 0;
}

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