add first draft of low battery notifications

4 files changed, 413 insertions, 4 deletions

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index a39b945..4747b12 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -10,6 +10,7 @@ set(SERVICE_MANUAL_SOURCES
     ib-brightness-uscreen-control.c
     device-provider.c
     device.c
+    notifier.c
     service.c)
 
 # generated sources
diff --git a/src/main.c b/src/main.c
index 7363284..70b7f2a 100644
--- a/src/main.c
+++ b/src/main.c
@@ -25,6 +25,7 @@
 
 #include "device.h"
 #include "device-provider-upower.h"
+#include "notifier.h"
 #include "service.h"
 
 /***
@@ -41,9 +42,10 @@ on_name_lost (gpointer instance G_GNUC_UNUSED, gpointer loop)
 int
 main (int argc G_GNUC_UNUSED, char ** argv G_GNUC_UNUSED)
 {
-  GMainLoop * loop;
-  IndicatorPowerService * service;
   IndicatorPowerDeviceProvider * device_provider;
+  IndicatorPowerNotifier * notifier;
+  IndicatorPowerService * service;
+  GMainLoop * loop;
 
   /* boilerplate i18n */
   setlocale (LC_ALL, "");
@@ -52,6 +54,7 @@ main (int argc G_GNUC_UNUSED, char ** argv G_GNUC_UNUSED)
 
   /* run */
   device_provider = indicator_power_device_provider_upower_new ();
+  notifier = indicator_power_notifier_new (device_provider);
   service = indicator_power_service_new (device_provider);
   loop = g_main_loop_new (NULL, FALSE);
   g_signal_connect (service, INDICATOR_POWER_SERVICE_SIGNAL_NAME_LOST,
@@ -59,8 +62,9 @@ main (int argc G_GNUC_UNUSED, char ** argv G_GNUC_UNUSED)
   g_main_loop_run (loop);
 
   /* cleanup */
-  g_clear_object (&device_provider);
-  g_clear_object (&service);
   g_main_loop_unref (loop);
+  g_clear_object (&service);
+  g_clear_object (&notifier);
+  g_clear_object (&device_provider);
   return 0;
 }
diff --git a/src/notifier.c b/src/notifier.c
new file mode 100644
index 0000000..79ea4cc
--- /dev/null
+++ b/src/notifier.c
@@ -0,0 +1,336 @@
+/*
+ * Copyright 2014 Canonical Ltd.
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 3, as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranties of
+ * MERCHANTABILITY, SATISFACTORY QUALITY, 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, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *   Charles Kerr <charles.kerr@canonical.com>
+ */
+
+#include "device.h"
+#include "device-provider.h"
+#include "notifier.h"
+#include "service.h"
+
+#include <libnotify/notify.h>
+
+#include <glib/gi18n.h>
+#include <gio/gio.h>
+
+G_DEFINE_TYPE(IndicatorPowerNotifier,
+              indicator_power_notifier,
+              G_TYPE_OBJECT)
+
+enum
+{
+  PROP_0,
+  PROP_DEVICE_PROVIDER,
+  LAST_PROP
+};
+
+static GParamSpec * properties[LAST_PROP];
+
+static int n_notifiers = 0;
+
+struct _IndicatorPowerNotifierPrivate
+{
+  IndicatorPowerDeviceProvider * device_provider;
+  IndicatorPowerDevice * primary_device;
+  gdouble battery_level;
+  time_t time_remaining;
+  NotifyNotification* notify_notification;
+};
+
+typedef IndicatorPowerNotifierPrivate priv_t;
+
+/***
+****
+***/
+
+static void
+emit_critical_signal(IndicatorPowerNotifier * self G_GNUC_UNUSED)
+{
+  g_message("FIXME %s %s", G_STRFUNC, G_STRLOC);
+}
+
+static void
+emit_hide_signal(IndicatorPowerNotifier * self G_GNUC_UNUSED)
+{
+  g_message("FIXME %s %s", G_STRFUNC, G_STRLOC);
+}
+
+static void
+emit_show_signal(IndicatorPowerNotifier * self G_GNUC_UNUSED)
+{
+  g_message("FIXME %s %s", G_STRFUNC, G_STRLOC);
+}
+
+static void
+notification_clear(IndicatorPowerNotifier * self)
+{
+  priv_t * p = self->priv;
+
+  if (p->notify_notification != NULL)
+    {
+      notify_notification_clear_actions(p->notify_notification);
+      g_signal_handlers_disconnect_by_data(p->notify_notification, self);
+      g_clear_object(&p->notify_notification);
+      emit_hide_signal(self);
+    }
+}
+
+static void
+on_notification_clicked(NotifyNotification * notify_notification G_GNUC_UNUSED,
+                        char * action G_GNUC_UNUSED,
+                        gpointer gself G_GNUC_UNUSED)
+{
+  /* no-op */
+}
+
+static void
+notification_show(IndicatorPowerNotifier * self,
+                  IndicatorPowerDevice   * device)
+                   
+{
+  priv_t * p = self->priv;
+  char * body;
+  NotifyNotification * nn;
+
+  // if there's already a notification, tear it down
+  if (p->notify_notification != NULL)
+    {
+      notification_clear (self);
+    }
+
+  // create the notification
+  body = g_strdup_printf(_("%d%% charge remaining"), (int)indicator_power_device_get_percentage(device));
+  p->notify_notification = nn = notify_notification_new(_("Battery Low"), body, NULL);
+  notify_notification_set_hint(nn, "x-canonical-snap-decisions", g_variant_new_boolean(TRUE));
+  notify_notification_set_hint(nn, "x-canonical-private-button-tint", g_variant_new_boolean(TRUE));
+  notify_notification_add_action(nn, "OK", _("OK"), on_notification_clicked, self, NULL);
+  g_signal_connect_swapped(nn, "closed", G_CALLBACK(notification_clear), self);
+
+  // show the notification
+  GError* error = NULL;
+  notify_notification_show(nn, &error);
+  if (error != NULL)
+    {
+      g_critical("Unable to show snap decision for '%s': %s", body, error->message);
+      g_error_free(error);
+    }
+  else
+    {
+      emit_show_signal(self);
+    }
+
+  g_free (body);
+}
+
+static void
+on_battery_level_changed(IndicatorPowerNotifier * self        G_GNUC_UNUSED,
+                         IndicatorPowerDevice   * device,
+                         gdouble                  old_value,
+                         gdouble                  new_value)
+{
+  static const double critical_level = 2.0;
+  static const double very_low_level = 5.0;
+  static const double low_level = 48.0;
+
+  if (indicator_power_device_get_state(device) != UP_DEVICE_STATE_DISCHARGING)
+    return;
+
+g_message ("%s - %s - %f - %f", G_STRFUNC, indicator_power_device_get_object_path(device), old_value, new_value);
+
+  if ((old_value > critical_level) && (new_value <= critical_level))
+    {
+      emit_critical_signal(self);
+    }
+  else if ((old_value > very_low_level) && (new_value <= very_low_level))
+    {
+      notification_show(self, device);
+    }
+  else if ((old_value > low_level) && (new_value <= low_level))
+    {
+      notification_show(self, device);
+    }
+}
+
+static void
+on_devices_changed(IndicatorPowerNotifier * self)
+{
+  priv_t * p = self->priv;
+  GList * devices;
+
+  // find the primary device
+  devices = indicator_power_device_provider_get_devices(p->device_provider);
+  g_clear_object(&p->primary_device);
+  p->primary_device = indicator_power_service_choose_primary_device (devices);
+  g_list_free_full (devices, (GDestroyNotify)g_object_unref);
+
+  if (p->primary_device != NULL)
+    {
+      // test for battery level change
+      const gdouble old_level = (int)(p->battery_level*1000) ? p->battery_level : 100.0;
+      const gdouble new_level = indicator_power_device_get_percentage(p->primary_device);
+      if ((int)(old_level*1000) != (int)(new_level*1000))
+          on_battery_level_changed (self, p->primary_device, old_level, new_level);
+
+      p->battery_level = new_level;
+      p->time_remaining = indicator_power_device_get_time (p->primary_device);
+    }
+}
+
+/***
+****  GObject virtual functions
+***/
+
+static void
+my_get_property (GObject     * o,
+                  guint         property_id,
+                  GValue      * value,
+                  GParamSpec  * pspec)
+{
+  IndicatorPowerNotifier * self = INDICATOR_POWER_NOTIFIER (o);
+  priv_t * p = self->priv;
+
+  switch (property_id)
+    {
+      case PROP_DEVICE_PROVIDER:
+        g_value_set_object (value, p->device_provider);
+        break;
+
+      default:
+        G_OBJECT_WARN_INVALID_PROPERTY_ID (o, property_id, pspec);
+    }
+}
+
+static void
+my_set_property (GObject       * o,
+                 guint           property_id,
+                 const GValue  * value,
+                 GParamSpec    * pspec)
+{
+  IndicatorPowerNotifier * self = INDICATOR_POWER_NOTIFIER (o);
+
+  switch (property_id)
+    {
+      case PROP_DEVICE_PROVIDER:
+        indicator_power_notifier_set_device_provider (self, g_value_get_object (value));
+        break;
+
+      default:
+        G_OBJECT_WARN_INVALID_PROPERTY_ID (o, property_id, pspec);
+    }
+}
+
+static void
+my_dispose (GObject * o)
+{
+  IndicatorPowerNotifier * self = INDICATOR_POWER_NOTIFIER(o);
+
+  indicator_power_notifier_set_device_provider(self, NULL);
+  notification_clear(self);
+
+  G_OBJECT_CLASS (indicator_power_notifier_parent_class)->dispose (o);
+}
+
+static void
+my_finalize (GObject * o G_GNUC_UNUSED)
+{
+  if (!--n_notifiers)
+    notify_uninit();
+}
+
+/***
+****  Instantiation
+***/
+
+static void
+indicator_power_notifier_init (IndicatorPowerNotifier * self)
+{
+  priv_t * p = G_TYPE_INSTANCE_GET_PRIVATE (self,
+                                            INDICATOR_TYPE_POWER_NOTIFIER,
+                                            IndicatorPowerNotifierPrivate);
+  self->priv = p;
+
+  //p->battery_levels = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, (GDestroyNotify)g_variant_unref);
+
+  if (!n_notifiers++ && !notify_init("indicator-power-service"))
+    g_critical("Unable to initialize libnotify! Notifications might not be shown.");
+}
+
+static void
+indicator_power_notifier_class_init (IndicatorPowerNotifierClass * klass)
+{
+  GObjectClass * object_class = G_OBJECT_CLASS (klass);
+
+  object_class->dispose = my_dispose;
+  object_class->finalize = my_finalize;
+  object_class->get_property = my_get_property;
+  object_class->set_property = my_set_property;
+
+  g_type_class_add_private (klass, sizeof (IndicatorPowerNotifierPrivate));
+
+  properties[PROP_0] = NULL;
+
+  properties[PROP_DEVICE_PROVIDER] = g_param_spec_object (
+    "device-provider",
+    "Device Provider",
+    "Source for power devices",
+    G_TYPE_OBJECT,
+    G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
+
+  g_object_class_install_properties (object_class, LAST_PROP, properties);
+}
+
+/***
+****  Public API
+***/
+
+IndicatorPowerNotifier *
+indicator_power_notifier_new (IndicatorPowerDeviceProvider * device_provider)
+{
+  GObject * o = g_object_new (INDICATOR_TYPE_POWER_NOTIFIER,
+                              "device-provider", device_provider,
+                              NULL);
+
+  return INDICATOR_POWER_NOTIFIER (o);
+}
+
+void
+indicator_power_notifier_set_device_provider(IndicatorPowerNotifier * self,
+                                             IndicatorPowerDeviceProvider * dp)
+{
+  priv_t * p;
+
+  g_return_if_fail(INDICATOR_IS_POWER_NOTIFIER(self));
+  g_return_if_fail(!dp || INDICATOR_IS_POWER_DEVICE_PROVIDER(dp));
+  p = self->priv;
+
+  if (p->device_provider != NULL)
+    {
+      g_signal_handlers_disconnect_by_data(p->device_provider, self);
+      g_clear_object(&p->device_provider);
+      g_clear_object(&p->primary_device);
+    }
+
+  if (dp != NULL)
+    {
+      p->device_provider = g_object_ref(dp);
+
+      g_signal_connect_swapped(p->device_provider, "devices-changed",
+                               G_CALLBACK(on_devices_changed), self);
+
+      on_devices_changed(self);
+    }
+}
diff --git a/src/notifier.h b/src/notifier.h
new file mode 100644
index 0000000..e8dfaab
--- /dev/null
+++ b/src/notifier.h
@@ -0,0 +1,68 @@
+/*
+ * Copyright 2014 Canonical Ltd.
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 3, as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranties of
+ * MERCHANTABILITY, SATISFACTORY QUALITY, 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, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *   Charles Kerr <charles.kerr@canonical.com>
+ */
+
+#ifndef __INDICATOR_POWER_NOTIFIER_H__
+#define __INDICATOR_POWER_NOTIFIER_H__
+
+#include <glib.h>
+#include <glib-object.h>
+
+#include "device-provider.h"
+
+G_BEGIN_DECLS
+
+/* standard GObject macros */
+#define INDICATOR_POWER_NOTIFIER(o)    (G_TYPE_CHECK_INSTANCE_CAST ((o), INDICATOR_TYPE_POWER_NOTIFIER, IndicatorPowerNotifier))
+#define INDICATOR_TYPE_POWER_NOTIFIER  (indicator_power_notifier_get_type())
+#define INDICATOR_IS_POWER_NOTIFIER(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), INDICATOR_TYPE_POWER_NOTIFIER))
+
+typedef struct _IndicatorPowerNotifier         IndicatorPowerNotifier;
+typedef struct _IndicatorPowerNotifierClass    IndicatorPowerNotifierClass;
+typedef struct _IndicatorPowerNotifierPrivate  IndicatorPowerNotifierPrivate;
+
+/**
+ * The Indicator Power Notifier.
+ */
+struct _IndicatorPowerNotifier
+{
+  /*< private >*/
+  GObject parent;
+  IndicatorPowerNotifierPrivate * priv;
+};
+
+struct _IndicatorPowerNotifierClass
+{
+  GObjectClass parent_class;
+};
+
+/***
+****
+***/
+
+GType indicator_power_notifier_get_type (void);
+
+IndicatorPowerNotifier * indicator_power_notifier_new (IndicatorPowerDeviceProvider * provider);
+
+void indicator_power_notifier_set_device_provider (IndicatorPowerNotifier       * self,
+                                                   IndicatorPowerDeviceProvider * provider);
+
+
+G_END_DECLS
+
+#endif /* __INDICATOR_POWER_NOTIFIER_H__ */