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meego-tablet-shell.c

/*
 * Copyright © 2011 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 <sys/wait.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <fcntl.h>
#include <linux/input.h>

#include "compositor.h"
#include "meego-tablet-server-protocol.h"

/*
 * TODO: Don't fade back from black until we've received a lockscreen
 * attachment.
 */

enum {
      STATE_STARTING,
      STATE_LOCKED,
      STATE_HOME,
      STATE_SWITCHER,
      STATE_TASK
};

00049 struct meego_tablet_shell {
      struct wl_object object;

      struct wlsc_shell shell;

      struct wlsc_compositor *compositor;
      struct wlsc_process process;
      struct wlsc_input_device *device;
      struct wl_client *client;

      struct wlsc_surface *surface;

      struct wlsc_surface *lockscreen_surface;
      struct wl_listener lockscreen_listener;

      struct wlsc_surface *home_surface;

      struct wlsc_surface *switcher_surface;
      struct wl_listener switcher_listener;

      struct meego_tablet_client *current_client;

      int state, previous_state;
      int long_press_active;
      struct wl_event_source *long_press_source;
};

00076 struct meego_tablet_client {
      struct wl_resource resource;
      struct meego_tablet_shell *shell;
      struct wl_client *client;
      struct wlsc_surface *surface;
      char *name;
};

00084 struct meego_tablet_zoom {
      struct wlsc_surface *surface;
      struct wlsc_animation animation;
      struct wlsc_spring spring;
      struct wlsc_transform transform;
      struct wl_listener listener;
      struct meego_tablet_shell *shell;
      void (*done)(struct meego_tablet_zoom *zoom);
};


static void
meego_tablet_shell_sigchld(struct wlsc_process *process, int status)
{
      struct meego_tablet_shell *shell =
            container_of(process, struct meego_tablet_shell, process);

      shell->process.pid = 0;

      fprintf(stderr, "meego-ux-daemon crashed, exit code %d\n", status);
}

static void
meego_tablet_shell_set_state(struct meego_tablet_shell *shell, int state)
{
      static const char *states[] = {
            "STARTING", "LOCKED", "HOME", "SWITCHER", "TASK"
      };

      fprintf(stderr, "switching to state %s (from %s)\n",
            states[state], states[shell->state]);
      shell->previous_state = shell->state;
      shell->state = state;
}

static void
meego_tablet_zoom_destroy(struct meego_tablet_zoom *zoom)
{
      wl_list_remove(&zoom->animation.link);
      zoom->surface->transform = NULL;
      if (zoom->done)
            zoom->done(zoom);
      free(zoom);
}

static void
handle_zoom_surface_destroy(struct wl_listener *listener,
                      struct wl_resource *resource, uint32_t time)
{
      struct meego_tablet_zoom *zoom =
            container_of(listener, struct meego_tablet_zoom, listener);

      fprintf(stderr, "animation surface gone\n");
      meego_tablet_zoom_destroy(zoom);
}

static void
meego_tablet_zoom_frame(struct wlsc_animation *animation,
                  struct wlsc_output *output, uint32_t msecs)
{
      struct meego_tablet_zoom *zoom =
            container_of(animation, struct meego_tablet_zoom, animation);
      struct wlsc_surface *es = zoom->surface;
      GLfloat scale;

      wlsc_spring_update(&zoom->spring, msecs);

      if (wlsc_spring_done(&zoom->spring)) {
            fprintf(stderr, "animation done\n");
            meego_tablet_zoom_destroy(zoom);
      }

      scale = zoom->spring.current;
      wlsc_matrix_init(&zoom->transform.matrix);
      wlsc_matrix_translate(&zoom->transform.matrix,
                        -es->width / 2.0, -es->height / 2.0, 0);
      wlsc_matrix_scale(&zoom->transform.matrix, scale, scale, scale);
      wlsc_matrix_translate(&zoom->transform.matrix,
                        es->width / 2.0, es->height / 2.0, 0);

      scale = 1.0 / zoom->spring.current;
      wlsc_matrix_init(&zoom->transform.inverse);
      wlsc_matrix_scale(&zoom->transform.inverse, scale, scale, scale);

      wlsc_surface_damage(es);
}

static struct meego_tablet_zoom *
meego_tablet_zoom_run(struct meego_tablet_shell *shell,
                  struct wlsc_surface *surface,
                  GLfloat start, GLfloat stop)
{
      struct meego_tablet_zoom *zoom;

      fprintf(stderr, "starting animation for surface %p\n", surface);

      zoom = malloc(sizeof *zoom);
      if (!zoom)
            return NULL;

      zoom->shell = shell;
      zoom->surface = surface;
      zoom->done = NULL;
      surface->transform = &zoom->transform;
      wlsc_spring_init(&zoom->spring, 200.0, start, stop);
      zoom->spring.timestamp = wlsc_compositor_get_time();
      zoom->animation.frame = meego_tablet_zoom_frame;
      meego_tablet_zoom_frame(&zoom->animation, NULL,
                        zoom->spring.timestamp);

      zoom->listener.func = handle_zoom_surface_destroy;
      wl_list_insert(surface->surface.resource.destroy_listener_list.prev,
                   &zoom->listener.link);

      wl_list_insert(shell->compositor->animation_list.prev,
                   &zoom->animation.link);

      return zoom;
}

/* FIXME: We should be handling map, not attach...  Map is when the
 * surface becomes visible, which is what we want to catch.  Attach
 * will happen whenever the surface changes. */

static void
meego_tablet_shell_attach(struct wlsc_shell *base,
                    struct wlsc_surface *surface)
{
      struct meego_tablet_shell *shell =
            container_of(base, struct meego_tablet_shell, shell);

      surface->x = 0;
      surface->y = 0;

      if (surface == shell->lockscreen_surface) {
            wlsc_compositor_fade(shell->compositor, 0.0);
            wlsc_compositor_wake(shell->compositor);
      } else if (surface == shell->switcher_surface) {
            /* */
      } else if (surface == shell->home_surface) {
            if (shell->state == STATE_STARTING) {
                  meego_tablet_shell_set_state(shell, STATE_LOCKED);
                  shell->previous_state = STATE_HOME;
                  wl_client_post_event(shell->client, &shell->object,
                                   MEEGO_TABLET_SHELL_SHOW_LOCKSCREEN);
            }
      } else if (shell->current_client &&
               shell->current_client->surface != surface &&
               shell->current_client->client == surface->surface.client) {
            meego_tablet_shell_set_state(shell, STATE_TASK);
            shell->current_client->surface = surface;
            meego_tablet_zoom_run(shell, surface, 0.3, 1.0);
      }
}

static void
handle_lockscreen_surface_destroy(struct wl_listener *listener,
                          struct wl_resource *resource, uint32_t time)
{
      struct meego_tablet_shell *shell =
            container_of(listener,
                       struct meego_tablet_shell, lockscreen_listener);

      shell->lockscreen_surface = NULL;
      meego_tablet_shell_set_state(shell, shell->previous_state);
}

static void
tablet_shell_set_lockscreen(struct wl_client *client,
                      struct meego_tablet_shell *shell,
                      struct wl_surface *surface)
{
      struct wlsc_surface *es = (struct wlsc_surface *) surface;
      struct wlsc_input_device *device =
            (struct wlsc_input_device *) shell->compositor->input_device;

      es->x = 0;
      es->y = 0;
      wlsc_surface_activate(es, device, wlsc_compositor_get_time());
      shell->lockscreen_surface = es;

      shell->lockscreen_listener.func = handle_lockscreen_surface_destroy;
      wl_list_insert(es->surface.resource.destroy_listener_list.prev,
                   &shell->lockscreen_listener.link);
}

static void
handle_switcher_surface_destroy(struct wl_listener *listener,
                        struct wl_resource *resource, uint32_t time)
{
      struct meego_tablet_shell *shell =
            container_of(listener,
                       struct meego_tablet_shell, switcher_listener);

      shell->switcher_surface = NULL;
      if (shell->state != STATE_LOCKED)
            meego_tablet_shell_set_state(shell, shell->previous_state);
}

static void
tablet_shell_set_switcher(struct wl_client *client,
                    struct meego_tablet_shell *shell,
                    struct wl_surface *surface)
{
      struct wlsc_input_device *device =
            (struct wlsc_input_device *) shell->compositor->input_device;
      struct wlsc_surface *es = (struct wlsc_surface *) surface;

      /* FIXME: Switcher should be centered and the compositor
       * should do the tinting of the background.  With the cache
       * layer idea, we should be able to hit the framerate on the
       * fade/zoom in. */
      shell->switcher_surface = es;
      shell->switcher_surface->x = 0;
      shell->switcher_surface->y = 0;

      wlsc_surface_activate(es, device, wlsc_compositor_get_time());

      shell->switcher_listener.func = handle_switcher_surface_destroy;
      wl_list_insert(es->surface.resource.destroy_listener_list.prev,
                   &shell->switcher_listener.link);
}

static void
tablet_shell_set_homescreen(struct wl_client *client,
                      struct meego_tablet_shell *shell,
                      struct wl_surface *surface)
{
      struct wlsc_input_device *device =
            (struct wlsc_input_device *) shell->compositor->input_device;

      shell->home_surface = (struct wlsc_surface *) surface;
      shell->home_surface->x = 0;
      shell->home_surface->y = 0;

      wlsc_surface_activate(shell->home_surface, device,
                        wlsc_compositor_get_time());
}

static void
minimize_zoom_done(struct meego_tablet_zoom *zoom)
{
      struct meego_tablet_shell *shell = zoom->shell;
      struct wlsc_compositor *compositor = shell->compositor;
      struct wlsc_input_device *device =
            (struct wlsc_input_device *) compositor->input_device;

      wlsc_surface_activate(shell->home_surface,
                        device, wlsc_compositor_get_time());
}

static void
meego_tablet_shell_switch_to(struct meego_tablet_shell *shell,
                       struct wlsc_surface *surface)
{
      struct wlsc_compositor *compositor = shell->compositor;
      struct wlsc_input_device *device =
            (struct wlsc_input_device *) compositor->input_device;
      struct wlsc_surface *current;
      struct meego_tablet_zoom *zoom;

      if (shell->state == STATE_SWITCHER) {
            wl_list_remove(&shell->switcher_listener.link);
            shell->switcher_surface = NULL;
      };

      if (surface == shell->home_surface) {
            meego_tablet_shell_set_state(shell, STATE_HOME);

            if (shell->current_client && shell->current_client->surface) {
                  current = shell->current_client->surface;
                  zoom = meego_tablet_zoom_run(shell, current, 1.0, 0.3);
                  zoom->done = minimize_zoom_done;
            }
      } else {
            fprintf(stderr, "switch to %p\n", surface);
            wlsc_surface_activate(surface, device,
                              wlsc_compositor_get_time());
            meego_tablet_shell_set_state(shell, STATE_TASK);
            meego_tablet_zoom_run(shell, surface, 0.3, 1.0);
      }
}

static void
tablet_shell_show_grid(struct wl_client *client,
                   struct meego_tablet_shell *shell,
                   struct wl_surface *surface)
{
      meego_tablet_shell_switch_to(shell, (struct wlsc_surface *) surface);
}

static void
tablet_shell_show_panels(struct wl_client *client,
                   struct meego_tablet_shell *shell,
                   struct wl_surface *surface)
{
      meego_tablet_shell_switch_to(shell, (struct wlsc_surface *) surface);
}

static void
destroy_tablet_client(struct wl_resource *resource, struct wl_client *client)
{
      struct meego_tablet_client *tablet_client =
            container_of(resource, struct meego_tablet_client, resource);

      free(tablet_client->name);
      free(tablet_client);
}

static void
tablet_client_destroy(struct wl_client *client,
                  struct meego_tablet_client *tablet_client)
{
      wl_resource_destroy(&tablet_client->resource,
                      client, wlsc_compositor_get_time());
}

static void
tablet_client_activate(struct wl_client *client,
                   struct meego_tablet_client *tablet_client)
{
      struct meego_tablet_shell *shell = tablet_client->shell;

      shell->current_client = tablet_client;
      if (!tablet_client->surface)
            return;

      meego_tablet_shell_switch_to(shell, tablet_client->surface);
}

static const struct meego_tablet_client_interface tablet_client_interface = {
      tablet_client_destroy,
      tablet_client_activate
};

static void
tablet_shell_create_client(struct wl_client *client,
                     struct meego_tablet_shell *shell,
                     uint32_t id, const char *name, int fd)
{
      struct wlsc_compositor *compositor = shell->compositor;
      struct meego_tablet_client *tablet_client;

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

      tablet_client->client = wl_client_create(compositor->wl_display, fd);
      tablet_client->shell = shell;
      tablet_client->name = strdup(name);

      tablet_client->resource.destroy = destroy_tablet_client;
      tablet_client->resource.object.id = id;
      tablet_client->resource.object.interface =
            &meego_tablet_client_interface;
      tablet_client->resource.object.implementation =
            (void (**)(void)) &tablet_client_interface;

      wl_client_add_resource(client, &tablet_client->resource);
      tablet_client->surface = NULL;
      shell->current_client = tablet_client;

      fprintf(stderr, "created client %p, id %d, name %s, fd %d\n",
            tablet_client->client, id, name, fd);
}

static const struct meego_tablet_shell_interface tablet_shell_interface = {
      tablet_shell_set_lockscreen,
      tablet_shell_set_switcher,
      tablet_shell_set_homescreen,
      tablet_shell_show_grid,
      tablet_shell_show_panels,
      tablet_shell_create_client
};

static void
launch_ux_daemon(struct meego_tablet_shell *shell)
{
      struct wlsc_compositor *compositor = shell->compositor;
      char s[32];
      int sv[2], flags;

      if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, sv) < 0) {
            fprintf(stderr, "socketpair failed\n");
            return;
      }

      shell->process.pid = fork();
      shell->process.cleanup = meego_tablet_shell_sigchld;

      switch (shell->process.pid) {
      case 0:
            /* SOCK_CLOEXEC closes both ends, so we need to unset
             * the flag on the client fd. */
            flags = fcntl(sv[1], F_GETFD);
            if (flags != -1)
                  fcntl(sv[1], F_SETFD, flags & ~FD_CLOEXEC);

            snprintf(s, sizeof s, "%d", sv[1]);
            setenv("WAYLAND_SOCKET", s, 1);
            setenv("EGL_PLATFORM", "wayland", 1);
            setenv("QT_QPA_PLATFORM", "waylandgl", 1);
            if (execl("/usr/libexec/meego-ux-daemon",
                    "/usr/libexec/meego-ux-daemon", NULL) < 0)
                  fprintf(stderr, "exec failed: %m\n");
            exit(-1);

      default:
            close(sv[1]);
            shell->client =
                  wl_client_create(compositor->wl_display, sv[0]);
            wlsc_watch_process(&shell->process);
            break;

      case -1:
            fprintf(stderr, "failed to fork\n");
            break;
      }
}

static void
toggle_switcher(struct meego_tablet_shell *shell)
{
      switch (shell->state) {
      case STATE_SWITCHER:
            wl_client_post_event(shell->client, &shell->object,
                             MEEGO_TABLET_SHELL_HIDE_SWITCHER);
            break;
      default:
            wl_client_post_event(shell->client, &shell->object,
                             MEEGO_TABLET_SHELL_SHOW_SWITCHER);
            meego_tablet_shell_set_state(shell, STATE_SWITCHER);
            break;
      }
}

static void
meego_tablet_shell_lock(struct wlsc_shell *base)
{
      struct meego_tablet_shell *shell =
            container_of(base, struct meego_tablet_shell, shell);

      if (shell->state == STATE_LOCKED)
            return;
      if (shell->state == STATE_SWITCHER)
            wl_client_post_event(shell->client, &shell->object,
                             MEEGO_TABLET_SHELL_HIDE_SWITCHER);

      wl_client_post_event(shell->client, &shell->object,
                       MEEGO_TABLET_SHELL_SHOW_LOCKSCREEN);
      
      meego_tablet_shell_set_state(shell, STATE_LOCKED);
}

static void
go_home(struct meego_tablet_shell *shell)
{
      struct wlsc_input_device *device =
            (struct wlsc_input_device *) shell->compositor->input_device;

      if (shell->state == STATE_SWITCHER)
            wl_client_post_event(shell->client, &shell->object,
                             MEEGO_TABLET_SHELL_HIDE_SWITCHER);

      wlsc_surface_activate(shell->home_surface, device,
                        wlsc_compositor_get_time());

      meego_tablet_shell_set_state(shell, STATE_HOME);
}

static int
long_press_handler(void *data)
{
      struct meego_tablet_shell *shell = data;

      shell->long_press_active = 0;
      toggle_switcher(shell);

      return 1;
}

static void
menu_key_binding(struct wl_input_device *device, uint32_t time,
             uint32_t key, uint32_t button, uint32_t state, void *data)
{
      struct meego_tablet_shell *shell = data;

      if (shell->state == STATE_LOCKED)
            return;

      if (state)
            toggle_switcher(shell);
}

static void
home_key_binding(struct wl_input_device *device, uint32_t time,
             uint32_t key, uint32_t button, uint32_t state, void *data)
{
      struct meego_tablet_shell *shell = data;

      if (shell->state == STATE_LOCKED)
            return;

      shell->device = (struct wlsc_input_device *) device;

      if (state) {
            wl_event_source_timer_update(shell->long_press_source, 500);
            shell->long_press_active = 1;
      } else if (shell->long_press_active) {
            wl_event_source_timer_update(shell->long_press_source, 0);
            shell->long_press_active = 0;

            switch (shell->state) {
            case STATE_HOME:
            case STATE_SWITCHER:
                  toggle_switcher(shell);
                  break;
            default:
                  go_home(shell);
                  break;
            }
      }
}

static void
meego_tablet_shell_set_selection_focus(struct wlsc_shell *shell,
                               struct wl_selection *selection,
                               struct wl_surface *surface,
                               uint32_t time)
{
}

void
shell_init(struct wlsc_compositor *compositor);

WL_EXPORT void
shell_init(struct wlsc_compositor *compositor)
{
      struct meego_tablet_shell *shell;
      struct wl_event_loop *loop;

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

      memset(shell, 0, sizeof *shell);
      shell->compositor = compositor;

      shell->object.interface = &meego_tablet_shell_interface;
      shell->object.implementation =
            (void (**)(void)) &tablet_shell_interface;
      wl_display_add_object(compositor->wl_display, &shell->object);

      /* FIXME: This will make the object available to all clients. */
      wl_display_add_global(compositor->wl_display, &shell->object, NULL);

      loop = wl_display_get_event_loop(compositor->wl_display);
      shell->long_press_source =
            wl_event_loop_add_timer(loop, long_press_handler, shell);

      wlsc_compositor_add_binding(compositor, KEY_LEFTMETA, 0, 0,
                            home_key_binding, shell);
      wlsc_compositor_add_binding(compositor, KEY_RIGHTMETA, 0, 0,
                            home_key_binding, shell);
      wlsc_compositor_add_binding(compositor, KEY_LEFTMETA, 0,
                            MODIFIER_SUPER, home_key_binding, shell);
      wlsc_compositor_add_binding(compositor, KEY_RIGHTMETA, 0,
                            MODIFIER_SUPER, home_key_binding, shell);
      wlsc_compositor_add_binding(compositor, KEY_COMPOSE, 0, 0,
                            menu_key_binding, shell);

      compositor->shell = &shell->shell;

      shell->shell.lock = meego_tablet_shell_lock;
      shell->shell.attach = meego_tablet_shell_attach;
      shell->shell.set_selection_focus =
            meego_tablet_shell_set_selection_focus;
      launch_ux_daemon(shell);

      wlsc_spring_init(&compositor->fade.spring, 40.0, 1.0, 1.0);
      meego_tablet_shell_set_state(shell, STATE_STARTING);
}

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