moving from https://github.com/perberos/mate-desktop-environment

1 files changed, 579 insertions, 0 deletions

diff --git a/plugins/background/gsd-background-manager.c b/plugins/background/gsd-background-manager.c
new file mode 100644
index 0000000..8c42445
--- /dev/null
+++ b/plugins/background/gsd-background-manager.c
@@ -0,0 +1,579 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
+ *
+ * Copyright © 2001 Ximian, Inc.
+ * Copyright (C) 2007 William Jon McCann <[email protected]>
+ * Copyright 2007 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ */
+
+#include "config.h"
+
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+#include <locale.h>
+
+#include <dbus/dbus.h>
+
+#include <glib.h>
+#include <glib/gi18n.h>
+#include <gdk/gdk.h>
+#include <gdk/gdkx.h>
+#include <mateconf/mateconf-client.h>
+
+#define MATE_DESKTOP_USE_UNSTABLE_API
+#include <libmateui/mate-bg.h>
+#include <X11/Xatom.h>
+
+#include "mate-settings-profile.h"
+#include "gsd-background-manager.h"
+
+#define CAJA_SHOW_DESKTOP_KEY "/apps/caja/preferences/show_desktop"
+
+#define GSD_BACKGROUND_MANAGER_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GSD_TYPE_BACKGROUND_MANAGER, GsdBackgroundManagerPrivate))
+
+struct GsdBackgroundManagerPrivate
+{
+        MateConfClient *client;
+        MateBG     *bg;
+        guint        bg_notify_id;
+        guint        timeout_id;
+
+        DBusConnection *dbus_connection;
+};
+
+static void     gsd_background_manager_class_init  (GsdBackgroundManagerClass *klass);
+static void     gsd_background_manager_init        (GsdBackgroundManager      *background_manager);
+static void     gsd_background_manager_finalize    (GObject             *object);
+
+G_DEFINE_TYPE (GsdBackgroundManager, gsd_background_manager, G_TYPE_OBJECT)
+
+static gpointer manager_object = NULL;
+
+static gboolean
+caja_is_running (void)
+{
+       Atom           window_id_atom;
+       Window         caja_xid;
+       Atom           actual_type;
+       int            actual_format;
+       unsigned long  nitems;
+       unsigned long  bytes_after;
+       unsigned char *data;
+       int            retval;
+       Atom           wmclass_atom;
+       gboolean       running;
+       gint           error;
+
+       window_id_atom = XInternAtom (GDK_DISPLAY (),
+                                     "CAJA_DESKTOP_WINDOW_ID", True);
+
+       if (window_id_atom == None) {
+               return FALSE;
+       }
+
+       retval = XGetWindowProperty (GDK_DISPLAY (),
+                                    GDK_ROOT_WINDOW (),
+                                    window_id_atom,
+                                    0,
+                                    1,
+                                    False,
+                                    XA_WINDOW,
+                                    &actual_type,
+                                    &actual_format,
+                                    &nitems,
+                                    &bytes_after,
+                                    &data);
+
+       if (data != NULL) {
+               caja_xid = *(Window *) data;
+               XFree (data);
+       } else {
+               return FALSE;
+       }
+
+       if (actual_type != XA_WINDOW) {
+               return FALSE;
+       }
+       if (actual_format != 32) {
+               return FALSE;
+       }
+
+       wmclass_atom = XInternAtom (GDK_DISPLAY (), "WM_CLASS", False);
+
+       gdk_error_trap_push ();
+
+       retval = XGetWindowProperty (GDK_DISPLAY (),
+                                    caja_xid,
+                                    wmclass_atom,
+                                    0,
+                                    24,
+                                    False,
+                                    XA_STRING,
+                                    &actual_type,
+                                    &actual_format,
+                                    &nitems,
+                                    &bytes_after,
+                                    &data);
+
+       error = gdk_error_trap_pop ();
+
+       if (error == BadWindow) {
+               return FALSE;
+       }
+
+       if (actual_type == XA_STRING &&
+           nitems == 24 &&
+           bytes_after == 0 &&
+           actual_format == 8 &&
+           data != NULL &&
+           !strcmp ((char *)data, "desktop_window") &&
+           !strcmp ((char *)data + strlen ((char *)data) + 1, "Caja")) {
+               running = TRUE;
+       } else {
+               running = FALSE;
+       }
+
+       if (data != NULL) {
+               XFree (data);
+       }
+
+       return running;
+}
+
+static void
+draw_background (GsdBackgroundManager *manager,
+                 gboolean              use_crossfade)
+{
+        GdkDisplay *display;
+        int         n_screens;
+        int         i;
+
+        if (caja_is_running ()) {
+                return;
+        }
+
+        mate_settings_profile_start (NULL);
+
+        display = gdk_display_get_default ();
+        n_screens = gdk_display_get_n_screens (display);
+
+        for (i = 0; i < n_screens; ++i) {
+                GdkScreen *screen;
+                GdkWindow *root_window;
+                GdkPixmap *pixmap;
+
+                screen = gdk_display_get_screen (display, i);
+
+                root_window = gdk_screen_get_root_window (screen);
+
+                pixmap = mate_bg_create_pixmap (manager->priv->bg,
+                                                 root_window,
+                                                 gdk_screen_get_width (screen),
+                                                 gdk_screen_get_height (screen),
+                                                 TRUE);
+
+                if (use_crossfade) {
+                        MateBGCrossfade *fade;
+
+                        fade = mate_bg_set_pixmap_as_root_with_crossfade (screen, pixmap);
+                        g_signal_connect (fade, "finished",
+                                          G_CALLBACK (g_object_unref), NULL);
+                } else {
+                        mate_bg_set_pixmap_as_root (screen, pixmap);
+                }
+
+                g_object_unref (pixmap);
+        }
+
+        mate_settings_profile_end (NULL);
+}
+
+static void
+on_bg_changed (MateBG              *bg,
+               GsdBackgroundManager *manager)
+{
+        draw_background (manager, TRUE);
+}
+
+static void
+on_bg_transitioned (MateBG              *bg,
+                    GsdBackgroundManager *manager)
+{
+        draw_background (manager, FALSE);
+}
+
+static void
+mateconf_changed_callback (MateConfClient          *client,
+                        guint                 cnxn_id,
+                        MateConfEntry           *entry,
+                        GsdBackgroundManager *manager)
+{
+        mate_bg_load_from_preferences (manager->priv->bg,
+                                        manager->priv->client);
+}
+
+static void
+watch_bg_preferences (GsdBackgroundManager *manager)
+{
+        g_assert (manager->priv->bg_notify_id == 0);
+
+        mateconf_client_add_dir (manager->priv->client,
+                              MATE_BG_KEY_DIR,
+                              MATECONF_CLIENT_PRELOAD_NONE,
+                              NULL);
+        manager->priv->bg_notify_id = mateconf_client_notify_add (manager->priv->client,
+                                                               MATE_BG_KEY_DIR,
+                                                               (MateConfClientNotifyFunc)mateconf_changed_callback,
+                                                               manager,
+                                                               NULL,
+                                                               NULL);
+}
+
+static void
+setup_bg (GsdBackgroundManager *manager)
+{
+        g_return_if_fail (manager->priv->bg == NULL);
+
+        manager->priv->bg = mate_bg_new ();
+
+        g_signal_connect (manager->priv->bg,
+                          "changed",
+                          G_CALLBACK (on_bg_changed),
+                          manager);
+
+        g_signal_connect (manager->priv->bg,
+                          "transitioned",
+                          G_CALLBACK (on_bg_transitioned),
+                          manager);
+
+        watch_bg_preferences (manager);
+        mate_bg_load_from_preferences (manager->priv->bg,
+                                        manager->priv->client);
+}
+
+static gboolean
+queue_draw_background (GsdBackgroundManager *manager)
+{
+        manager->priv->timeout_id = 0;
+        if (caja_is_running ()) {
+                return FALSE;
+        }
+        setup_bg (manager);
+        draw_background (manager, FALSE);
+        return FALSE;
+}
+
+static DBusHandlerResult
+on_bus_message (DBusConnection *connection,
+                DBusMessage    *message,
+                void           *user_data)
+{
+        GsdBackgroundManager *manager = user_data;
+
+        if (dbus_message_is_signal (message,
+                                    "org.mate.SessionManager",
+                                    "SessionRunning")) {
+                /* If the session finishes then check if caja is
+                 * running and if not, set the background.
+                 *
+                 * We wait a few seconds after the session is up
+                 * because caja tells the session manager that its
+                 * ready before it sets the background.
+                 */
+                manager->priv->timeout_id = g_timeout_add_seconds (8,
+                                                                   (GSourceFunc)
+                                                                   queue_draw_background,
+                                                                   manager);
+                dbus_connection_remove_filter (connection,
+                                               on_bus_message,
+                                               manager);
+
+                manager->priv->dbus_connection = NULL;
+        }
+
+        return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
+}
+
+static void
+draw_background_after_session_loads (GsdBackgroundManager *manager)
+{
+        DBusConnection *connection;
+
+        connection = dbus_bus_get (DBUS_BUS_SESSION, NULL);
+
+        if (connection == NULL) {
+                return;
+        }
+
+        if (!dbus_connection_add_filter (connection, on_bus_message, manager, NULL)) {
+                return;
+        };
+
+        manager->priv->dbus_connection = connection;
+}
+
+static void
+on_screen_size_changed (GdkScreen            *screen,
+                        GsdBackgroundManager *manager)
+{
+        gboolean caja_show_desktop;
+
+        caja_show_desktop = mateconf_client_get_bool (manager->priv->client,
+                                                       CAJA_SHOW_DESKTOP_KEY,
+                                                       NULL);
+
+        if (!caja_is_running () || !caja_show_desktop) {
+                if (manager->priv->bg == NULL) {
+                        setup_bg (manager);
+                }
+                draw_background (manager, FALSE);
+        }
+}
+
+static void
+disconnect_screen_signals (GsdBackgroundManager *manager)
+{
+        GdkDisplay *display;
+        int         i;
+        int         n_screens;
+
+        display = gdk_display_get_default ();
+        n_screens = gdk_display_get_n_screens (display);
+
+        for (i = 0; i < n_screens; ++i) {
+                GdkScreen *screen;
+                screen = gdk_display_get_screen (display, i);
+                g_signal_handlers_disconnect_by_func (screen,
+                                                      G_CALLBACK (on_screen_size_changed),
+                                                      manager);
+        }
+}
+
+static void
+connect_screen_signals (GsdBackgroundManager *manager)
+{
+        GdkDisplay *display;
+        int         i;
+        int         n_screens;
+
+        display = gdk_display_get_default ();
+        n_screens = gdk_display_get_n_screens (display);
+
+        for (i = 0; i < n_screens; ++i) {
+                GdkScreen *screen;
+                screen = gdk_display_get_screen (display, i);
+                g_signal_connect (screen,
+                                  "monitors-changed",
+                                  G_CALLBACK (on_screen_size_changed),
+                                  manager);
+                g_signal_connect (screen,
+                                  "size-changed",
+                                  G_CALLBACK (on_screen_size_changed),
+                                  manager);
+        }
+}
+
+gboolean
+gsd_background_manager_start (GsdBackgroundManager *manager,
+                              GError              **error)
+{
+        gboolean caja_show_desktop;
+
+        g_debug ("Starting background manager");
+        mate_settings_profile_start (NULL);
+
+        manager->priv->client = mateconf_client_get_default ();
+
+        /* If this is set, caja will draw the background and is
+	 * almost definitely in our session.  however, it may not be
+	 * running yet (so is_caja_running() will fail).  so, on
+	 * startup, just don't do anything if this key is set so we
+	 * don't waste time setting the background only to have
+	 * caja overwrite it.
+	 */
+        caja_show_desktop = mateconf_client_get_bool (manager->priv->client,
+                                                       CAJA_SHOW_DESKTOP_KEY,
+                                                       NULL);
+
+        if (!caja_show_desktop) {
+                setup_bg (manager);
+        } else {
+                draw_background_after_session_loads (manager);
+        }
+
+        connect_screen_signals (manager);
+
+        mate_settings_profile_end (NULL);
+
+        return TRUE;
+}
+
+void
+gsd_background_manager_stop (GsdBackgroundManager *manager)
+{
+        GsdBackgroundManagerPrivate *p = manager->priv;
+
+        g_debug ("Stopping background manager");
+
+        disconnect_screen_signals (manager);
+
+        if (manager->priv->dbus_connection != NULL) {
+                dbus_connection_remove_filter (manager->priv->dbus_connection,
+                                               on_bus_message,
+                                               manager);
+        }
+
+        if (manager->priv->bg_notify_id != 0) {
+                mateconf_client_remove_dir (manager->priv->client,
+                                         MATE_BG_KEY_DIR,
+                                         NULL);
+                mateconf_client_notify_remove (manager->priv->client,
+                                            manager->priv->bg_notify_id);
+                manager->priv->bg_notify_id = 0;
+        }
+
+        if (p->client != NULL) {
+                g_object_unref (p->client);
+                p->client = NULL;
+        }
+
+        if (p->timeout_id != 0) {
+                g_source_remove (p->timeout_id);
+                p->timeout_id = 0;
+        }
+
+        if (p->bg != NULL) {
+                g_object_unref (p->bg);
+                p->bg = NULL;
+        }
+}
+
+static void
+gsd_background_manager_set_property (GObject        *object,
+                                     guint           prop_id,
+                                     const GValue   *value,
+                                     GParamSpec     *pspec)
+{
+        GsdBackgroundManager *self;
+
+        self = GSD_BACKGROUND_MANAGER (object);
+
+        switch (prop_id) {
+        default:
+                G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+                break;
+        }
+}
+
+static void
+gsd_background_manager_get_property (GObject        *object,
+                                     guint           prop_id,
+                                     GValue         *value,
+                                     GParamSpec     *pspec)
+{
+        GsdBackgroundManager *self;
+
+        self = GSD_BACKGROUND_MANAGER (object);
+
+        switch (prop_id) {
+        default:
+                G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+                break;
+        }
+}
+
+static GObject *
+gsd_background_manager_constructor (GType                  type,
+                                    guint                  n_construct_properties,
+                                    GObjectConstructParam *construct_properties)
+{
+        GsdBackgroundManager      *background_manager;
+        GsdBackgroundManagerClass *klass;
+
+        klass = GSD_BACKGROUND_MANAGER_CLASS (g_type_class_peek (GSD_TYPE_BACKGROUND_MANAGER));
+
+        background_manager = GSD_BACKGROUND_MANAGER (G_OBJECT_CLASS (gsd_background_manager_parent_class)->constructor (type,
+                                                                                                                        n_construct_properties,
+                                                                                                                        construct_properties));
+
+        return G_OBJECT (background_manager);
+}
+
+static void
+gsd_background_manager_dispose (GObject *object)
+{
+        GsdBackgroundManager *background_manager;
+
+        background_manager = GSD_BACKGROUND_MANAGER (object);
+
+        G_OBJECT_CLASS (gsd_background_manager_parent_class)->dispose (object);
+}
+
+static void
+gsd_background_manager_class_init (GsdBackgroundManagerClass *klass)
+{
+        GObjectClass   *object_class = G_OBJECT_CLASS (klass);
+
+        object_class->get_property = gsd_background_manager_get_property;
+        object_class->set_property = gsd_background_manager_set_property;
+        object_class->constructor = gsd_background_manager_constructor;
+        object_class->dispose = gsd_background_manager_dispose;
+        object_class->finalize = gsd_background_manager_finalize;
+
+        g_type_class_add_private (klass, sizeof (GsdBackgroundManagerPrivate));
+}
+
+static void
+gsd_background_manager_init (GsdBackgroundManager *manager)
+{
+        manager->priv = GSD_BACKGROUND_MANAGER_GET_PRIVATE (manager);
+}
+
+static void
+gsd_background_manager_finalize (GObject *object)
+{
+        GsdBackgroundManager *background_manager;
+
+        g_return_if_fail (object != NULL);
+        g_return_if_fail (GSD_IS_BACKGROUND_MANAGER (object));
+
+        background_manager = GSD_BACKGROUND_MANAGER (object);
+
+        g_return_if_fail (background_manager->priv != NULL);
+
+        G_OBJECT_CLASS (gsd_background_manager_parent_class)->finalize (object);
+}
+
+GsdBackgroundManager *
+gsd_background_manager_new (void)
+{
+        if (manager_object != NULL) {
+                g_object_ref (manager_object);
+        } else {
+                manager_object = g_object_new (GSD_TYPE_BACKGROUND_MANAGER, NULL);
+                g_object_add_weak_pointer (manager_object,
+                                           (gpointer *) &manager_object);
+        }
+
+        return GSD_BACKGROUND_MANAGER (manager_object);
+}