capplet: Add D-Bus context for notification daemon communication

Add D-Bus context module to connect future components of applet with
notification history.

4 files changed, 293 insertions, 0 deletions

diff --git a/src/capplet/Makefile.am b/src/capplet/Makefile.am
index af7569a..4126d3f 100644
--- a/src/capplet/Makefile.am
+++ b/src/capplet/Makefile.am
@@ -45,6 +45,8 @@ libmate_notification_applet_la_SOURCES = \
 	$(mate_notification_applet_resources_files) \
 	../common/constants.h \
 	mate-notification-applet.c \
+	mate-notification-applet-dbus.h \
+	mate-notification-applet-dbus.c \
 	$(NULL)
 
 libmate_notification_applet_la_CFLAGS = \
@@ -64,6 +66,8 @@ mate_notification_applet_SOURCES = \
 	$(mate_notification_applet_resources_files) \
 	../common/constants.h \
 	mate-notification-applet.c \
+	mate-notification-applet-dbus.h \
+	mate-notification-applet-dbus.c \
 	$(NULL)
 
 mate_notification_applet_CFLAGS = \
@@ -104,6 +108,7 @@ EXTRA_DIST = \
 	$(mate_notification_properties_resources_xml) \
 	mate-notification-applet-menu.xml \
 	mate-notification-properties.ui \
+	mate-notification-applet-dbus.h \
 	$(NULL)
 
 -include $(top_srcdir)/git.mk
diff --git a/src/capplet/mate-notification-applet-dbus.c b/src/capplet/mate-notification-applet-dbus.c
new file mode 100644
index 0000000..68ed6f3
--- /dev/null
+++ b/src/capplet/mate-notification-applet-dbus.c
@@ -0,0 +1,214 @@
+/* mate-notification-applet-dbus.c - MATE Notification Applet - D-Bus Context
+ *
+ * Copyright (C) 2025 MATE Developers
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301  USA
+ */
+
+#include "config.h"
+
+#include <glib.h>
+#include <gio/gio.h>
+
+#include "mate-notification-applet-dbus.h"
+#include "../common/constants.h"
+
+MateNotificationDBusContext *
+dbus_context_new (void)
+{
+  MateNotificationDBusContext *context = g_new0 (MateNotificationDBusContext, 1);
+  context->daemon_proxy = NULL;
+  context->daemon_available = FALSE;
+  context->watch_id = 0;
+  return context;
+}
+
+void
+dbus_context_free (MateNotificationDBusContext *context)
+{
+  if (context) {
+    dbus_context_disconnect (context);
+    g_free (context);
+  }
+}
+
+gboolean
+dbus_context_connect (MateNotificationDBusContext *context)
+{
+  GError *error = NULL;
+
+  if (!context)
+    return FALSE;
+
+  /* Clean up existing connection */
+  dbus_context_disconnect (context);
+
+  /* Create D-Bus proxy for notification daemon */
+  context->daemon_proxy = g_dbus_proxy_new_for_bus_sync (G_BUS_TYPE_SESSION,
+                                                         G_DBUS_PROXY_FLAGS_NONE,
+                                                         NULL, /* GDBusInterfaceInfo */
+                                                         NOTIFICATION_BUS_NAME,
+                                                         NOTIFICATION_BUS_PATH,
+                                                         "org.freedesktop.Notifications",
+                                                         NULL, /* GCancellable */
+                                                         &error);
+
+  if (error) {
+    g_warning ("Failed to connect to notification daemon: %s", error->message);
+    g_error_free (error);
+    context->daemon_available = FALSE;
+    return FALSE;
+  }
+
+  context->daemon_available = TRUE;
+  return TRUE;
+}
+
+void
+dbus_context_disconnect (MateNotificationDBusContext *context)
+{
+  if (!context)
+    return;
+
+  if (context->daemon_proxy) {
+    g_object_unref (context->daemon_proxy);
+    context->daemon_proxy = NULL;
+  }
+
+  context->daemon_available = FALSE;
+}
+
+gboolean
+dbus_context_is_available (MateNotificationDBusContext *context)
+{
+  return context && context->daemon_available && context->daemon_proxy;
+}
+
+guint
+dbus_context_get_notification_count (MateNotificationDBusContext *context)
+{
+  GVariant *result;
+  GError *error = NULL;
+  guint count = 0;
+
+  if (!dbus_context_is_available (context))
+    return 0;
+
+  result = g_dbus_proxy_call_sync (context->daemon_proxy,
+                                   "GetNotificationCount",
+                                   NULL,
+                                   G_DBUS_CALL_FLAGS_NONE,
+                                   -1, /* timeout */
+                                   NULL, /* GCancellable */
+                                   &error);
+
+  if (error) {
+    g_warning ("Failed to get notification count: %s", error->message);
+    g_error_free (error);
+    context->daemon_available = FALSE;
+  } else if (result) {
+    g_variant_get (result, "(u)", &count);
+    g_variant_unref (result);
+  }
+
+  return count;
+}
+
+gboolean
+dbus_context_clear_notification_history (MateNotificationDBusContext *context)
+{
+  GVariant *result;
+  GError *error = NULL;
+
+  if (!dbus_context_is_available (context))
+    return FALSE;
+
+  result = g_dbus_proxy_call_sync (context->daemon_proxy,
+                                   "ClearNotificationHistory",
+                                   NULL,
+                                   G_DBUS_CALL_FLAGS_NONE,
+                                   -1, /* timeout */
+                                   NULL, /* GCancellable */
+                                   &error);
+
+  if (error) {
+    g_warning ("Failed to clear notification history: %s", error->message);
+    g_error_free (error);
+    return FALSE;
+  }
+
+  if (result) {
+    g_variant_unref (result);
+  }
+
+  return TRUE;
+}
+
+gboolean
+dbus_context_mark_all_notifications_as_read (MateNotificationDBusContext *context)
+{
+  GVariant *result;
+  GError *error = NULL;
+
+  if (!dbus_context_is_available (context))
+    return FALSE;
+
+  result = g_dbus_proxy_call_sync (context->daemon_proxy,
+                                   "MarkAllNotificationsAsRead",
+                                   NULL,
+                                   G_DBUS_CALL_FLAGS_NONE,
+                                   -1, /* timeout */
+                                   NULL, /* GCancellable */
+                                   &error);
+
+  if (error) {
+    g_warning ("Failed to mark all notifications as read: %s", error->message);
+    g_error_free (error);
+    return FALSE;
+  }
+
+  if (result) {
+    g_variant_unref (result);
+  }
+
+  return TRUE;
+}
+
+GVariant *
+dbus_context_get_notification_history (MateNotificationDBusContext *context)
+{
+  GVariant *result;
+  GError *error = NULL;
+
+  if (!dbus_context_is_available (context))
+    return NULL;
+
+  result = g_dbus_proxy_call_sync (context->daemon_proxy,
+                                   "GetNotificationHistory",
+                                   NULL,
+                                   G_DBUS_CALL_FLAGS_NONE,
+                                   -1, /* timeout */
+                                   NULL, /* GCancellable */
+                                   &error);
+
+  if (error) {
+    g_warning ("Failed to get notification history: %s", error->message);
+    g_error_free (error);
+    return NULL;
+  }
+
+  return result; /* Caller owns this reference */
+}
diff --git a/src/capplet/mate-notification-applet-dbus.h b/src/capplet/mate-notification-applet-dbus.h
new file mode 100644
index 0000000..7f95bc3
--- /dev/null
+++ b/src/capplet/mate-notification-applet-dbus.h
@@ -0,0 +1,52 @@
+/* mate-notification-applet-dbus.h - MATE Notification Applet - D-Bus Context
+ *
+ * Copyright (C) 2025 MATE Developers
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301  USA
+ */
+
+#ifndef __MATE_NOTIFICATION_APPLET_DBUS_H__
+#define __MATE_NOTIFICATION_APPLET_DBUS_H__
+
+#include <gio/gio.h>
+
+G_BEGIN_DECLS
+
+/* D-Bus context structure for notification daemon communication */
+typedef struct {
+  GDBusProxy *daemon_proxy;
+  gboolean    daemon_available;
+  guint       watch_id;
+} MateNotificationDBusContext;
+
+/* Context creation/cleanup */
+MateNotificationDBusContext *dbus_context_new (void);
+void dbus_context_free (MateNotificationDBusContext *context);
+
+/* Connection management */
+gboolean dbus_context_connect (MateNotificationDBusContext *context);
+void dbus_context_disconnect (MateNotificationDBusContext *context);
+gboolean dbus_context_is_available (MateNotificationDBusContext *context);
+
+/* Notification daemon method calls */
+guint dbus_context_get_notification_count (MateNotificationDBusContext *context);
+gboolean dbus_context_clear_notification_history (MateNotificationDBusContext *context);
+gboolean dbus_context_mark_all_notifications_as_read (MateNotificationDBusContext *context);
+GVariant *dbus_context_get_notification_history (MateNotificationDBusContext *context);
+
+G_END_DECLS
+
+#endif /* __MATE_NOTIFICATION_APPLET_DBUS_H__ */
diff --git a/src/capplet/mate-notification-applet.c b/src/capplet/mate-notification-applet.c
index 7402707..f7d02e0 100644
--- a/src/capplet/mate-notification-applet.c
+++ b/src/capplet/mate-notification-applet.c
@@ -25,11 +25,13 @@
 #include <glib/gi18n-lib.h>
 #include <gtk/gtk.h>
 #include <mate-panel-applet.h>
+#include <gio/gio.h>
 
 #define MATE_DESKTOP_USE_UNSTABLE_API
 #include <libmate-desktop/mate-desktop-utils.h>
 
 #include "constants.h"
+#include "mate-notification-applet-dbus.h"
 
 typedef struct
 {
@@ -39,6 +41,8 @@ typedef struct
   GtkWidget       *image_off;
   GtkActionGroup  *action_group;
   GSettings       *settings;
+
+  MateNotificationDBusContext    *dbus_context;
 } MateNotificationApplet;
 
 static void
@@ -48,6 +52,9 @@ static void
 call_properties (GtkAction              *action,
                  MateNotificationApplet *applet);
 
+static void
+setup_daemon_connection (MateNotificationApplet *applet);
+
 static const GtkActionEntry applet_menu_actions [] = {
   { "Preferences", "document-properties", N_("_Preferences"),
     NULL, NULL, G_CALLBACK (call_properties) },
@@ -65,6 +72,10 @@ applet_destroy (MatePanelApplet *applet_widget,
 {
   g_assert (applet);
 
+  if (applet->dbus_context) {
+    dbus_context_free (applet->dbus_context);
+  }
+
   g_object_unref (applet->settings);
   g_object_unref (applet->action_group);
   g_free (applet);
@@ -161,6 +172,12 @@ applet_draw_icon (MatePanelApplet *applet_widget,
   cairo_surface_destroy (image_off);
 }
 
+static void
+setup_daemon_connection (MateNotificationApplet *applet)
+{
+  dbus_context_connect (applet->dbus_context);
+}
+
 static MateNotificationApplet*
 applet_main (MatePanelApplet *applet_widget)
 {
@@ -176,6 +193,9 @@ applet_main (MatePanelApplet *applet_widget)
   applet->applet = applet_widget;
   applet->settings = g_settings_new (GSETTINGS_SCHEMA);
 
+  /* Initialize D-Bus context */
+  applet->dbus_context = dbus_context_new ();
+
 #ifndef ENABLE_IN_PROCESS
   /* needed to clamp ourselves to the panel size */
   mate_panel_applet_set_flags (MATE_PANEL_APPLET (applet), MATE_PANEL_APPLET_EXPAND_MINOR);
@@ -230,6 +250,8 @@ applet_main (MatePanelApplet *applet_widget)
   g_signal_connect (G_OBJECT (applet->settings), "changed::" GSETTINGS_KEY_DO_NOT_DISTURB,
                     G_CALLBACK (settings_changed), applet);
 
+  setup_daemon_connection (applet);
+
   return applet;
 }