datetime: Add cc-tz-item

panels/datetime/cc-tz-item.c

@@ -0,0 +1,285 @@
+/* -*- mode: c; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/*
+ * Copyright 2022 Purism SPC
+ * Copyright 2022 Mohammed Sadiq <sadiq@sadiqpk.org>
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ * Author(s):
+ *   Mohammed Sadiq <sadiq@sadiqpk.org>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "cc-tz-item"
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <glib/gi18n.h>
+#define GNOME_DESKTOP_USE_UNSTABLE_API
+#include <libgnome-desktop/gnome-languages.h>
+#include <libgnome-desktop/gnome-wall-clock.h>
+
+#include "cc-tz-item.h"
+
+#define DEFAULT_TZ "Europe/London"
+#define GETTEXT_PACKAGE_TIMEZONES GETTEXT_PACKAGE "-timezones"
+
+struct _CcTzItem
+{
+  GObject         parent_instance;
+
+  GSettings      *desktop_settings;
+  GTimeZone      *tz;
+  GnomeWallClock *wall_clock;
+
+  TzLocation     *tz_location;
+  TzInfo         *tz_info;
+
+  char           *name;
+  char           *country;
+  char           *time;
+  char           *offset;    /* eg: UTC+530 */
+  char           *zone;
+};
+
+G_DEFINE_TYPE (CcTzItem, cc_tz_item, G_TYPE_OBJECT)
+
+enum {
+  PROP_0,
+  PROP_COUNTRY,
+  PROP_NAME,
+  PROP_OFFSET,
+  PROP_TIME,
+  PROP_ZONE,
+  N_PROPS
+};
+
+static GParamSpec *properties[N_PROPS];
+
+/* Adapted from cc-datetime-panel.c */
+static void
+generate_city_name (CcTzItem   *self,
+                    TzLocation *loc)
+{
+  g_auto(GStrv) split_translated = NULL;
+  gint length;
+
+  /* Load the translation for it */
+  self->zone = g_strdup (dgettext (GETTEXT_PACKAGE_TIMEZONES, loc->zone));
+  g_strdelimit (self->zone, "_", ' ');
+  split_translated = g_regex_split_simple ("[\\x{2044}\\x{2215}\\x{29f8}\\x{ff0f}/]",
+                                           self->zone,
+                                           0, 0);
+
+  length = g_strv_length (split_translated);
+  self->country = gnome_get_country_from_code (loc->country, NULL);
+  self->name = g_strdup (split_translated[length-1]);
+}
+
+static const char *
+tz_item_get_time (CcTzItem *self)
+{
+  g_autoptr(GDateTime) now = NULL;
+  GDesktopClockFormat format;
+
+  g_assert (CC_IS_TZ_ITEM (self));
+
+  if (self->time)
+    return self->time;
+
+  now = g_date_time_new_now (self->tz);
+  format = g_settings_get_enum (self->desktop_settings, "clock-format");
+
+  self->time = gnome_wall_clock_string_for_datetime (self->wall_clock, now, format, TRUE, FALSE, FALSE);
+
+  return self->time;
+}
+
+static void
+tz_item_clock_changed_cb (CcTzItem *self)
+{
+  gboolean had_time;
+
+  g_assert (CC_IS_TZ_ITEM (self));
+
+  had_time = !!self->time;
+
+  /* Clear the time, so that it'll be re-created when asked for one */
+  g_clear_pointer (&self->time, g_free);
+
+  if (had_time)
+    g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_TIME]);
+}
+
+static void
+cc_tz_item_get_property (GObject    *object,
+                         guint       prop_id,
+                         GValue     *value,
+                         GParamSpec *pspec)
+{
+  CcTzItem *self = (CcTzItem *)object;
+
+  switch (prop_id)
+    {
+    case PROP_COUNTRY:
+      g_value_set_string (value, self->country);
+      break;
+
+    case PROP_NAME:
+      g_value_set_string (value, self->name);
+      break;
+
+    case PROP_OFFSET:
+      g_value_set_string (value, self->offset);
+      break;
+
+    case PROP_TIME:
+      g_value_set_string (value, tz_item_get_time (self));
+      break;
+
+    case PROP_ZONE:
+      g_value_set_string (value, self->zone);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+    }
+}
+
+static void
+cc_tz_item_finalize (GObject *object)
+{
+  CcTzItem *self = (CcTzItem *)object;
+
+  g_clear_object (&self->desktop_settings);
+  g_clear_object (&self->wall_clock);
+
+  g_clear_pointer (&self->tz, g_time_zone_unref);
+  g_clear_pointer (&self->tz_info, tz_info_free);
+
+  g_clear_pointer (&self->name, g_free);
+  g_clear_pointer (&self->country, g_free);
+  g_clear_pointer (&self->time, g_free);
+  g_clear_pointer (&self->offset, g_free);
+  g_clear_pointer (&self->zone, g_free);
+
+  G_OBJECT_CLASS (cc_tz_item_parent_class)->finalize (object);
+}
+
+static void
+cc_tz_item_class_init (CcTzItemClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->get_property = cc_tz_item_get_property;
+  object_class->finalize = cc_tz_item_finalize;
+
+  properties[PROP_COUNTRY] =
+    g_param_spec_string ("country",
+                         "Timezone Country",
+                         "Timezone Country",
+                         NULL,
+                         G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
+
+  properties[PROP_NAME] =
+    g_param_spec_string ("name",
+                         "Timezone Name",
+                         "Timezone Name",
+                         NULL,
+                         G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
+
+  properties[PROP_OFFSET] =
+    g_param_spec_string ("offset",
+                         "Timezone offset",
+                         "Timezone offset",
+                         NULL,
+                         G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
+
+  properties[PROP_TIME] =
+    g_param_spec_string ("time",
+                         "Timezone time",
+                         "Timezone time",
+                         NULL,
+                         G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
+
+  properties[PROP_ZONE] =
+    g_param_spec_string ("zone",
+                         "Timezone zone",
+                         "Timezone zone",
+                         NULL,
+                         G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
+
+  g_object_class_install_properties (object_class, N_PROPS, properties);
+}
+
+static void
+cc_tz_item_init (CcTzItem *self)
+{
+  self->desktop_settings = g_settings_new ("org.gnome.desktop.interface");
+  self->wall_clock = gnome_wall_clock_new ();
+
+  g_signal_connect_object (self->wall_clock, "notify::clock",
+                           G_CALLBACK (tz_item_clock_changed_cb),
+                           self,
+                           G_CONNECT_SWAPPED);
+  g_signal_connect_object (self->desktop_settings, "changed::clock-format",
+                           G_CALLBACK (tz_item_clock_changed_cb),
+                           self,
+                           G_CONNECT_SWAPPED);
+}
+
+CcTzItem *
+cc_tz_item_new (TzLocation *location)
+{
+  CcTzItem *self;
+  GString *offset;
+
+  g_return_val_if_fail (location, NULL);
+
+  self = g_object_new (CC_TYPE_TZ_ITEM, NULL);
+  self->tz_location = location;
+  self->tz_info = tz_info_from_location (location);
+  generate_city_name (self, location);
+
+  self->tz = g_time_zone_new_offset (self->tz_info->utc_offset);
+
+  offset = g_string_new (g_time_zone_get_identifier (self->tz));
+  /* Strip the seconds, eg: +05:30:00 -> +05:30 */
+  g_string_set_size (offset, offset->len - 3);
+  /* eg: +05:30 -> +0530*/
+  g_string_replace (offset, ":", "", 0);
+
+  /* If the timezone is UTC remove the time, which will always be [+]0000 */
+  if (g_str_has_suffix (offset->str, "0000"))
+    g_string_set_size (offset, 0);
+
+  /* eg: +0530 -> UTC+0530 */
+  g_string_prepend (offset, "UTC");
+
+  self->offset = g_string_free (offset, FALSE);
+
+  return self;
+}
+
+TzLocation *
+cc_tz_item_get_location (CcTzItem *self)
+{
+  g_return_val_if_fail (CC_IS_TZ_ITEM (self), NULL);
+
+  return self->tz_location;
+}

panels/datetime/cc-tz-item.h

@@ -0,0 +1,40 @@
+/* -*- mode: c; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/*
+ * Copyright 2022 Purism SPC
+ * Copyright 2022 Mohammed Sadiq <sadiq@sadiqpk.org>
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ * Author(s):
+ *   Mohammed Sadiq <sadiq@sadiqpk.org>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include <glib-object.h>
+
+#include "tz.h"
+
+G_BEGIN_DECLS
+
+#define CC_TYPE_TZ_ITEM (cc_tz_item_get_type ())
+
+G_DECLARE_FINAL_TYPE (CcTzItem, cc_tz_item, CC, TZ_ITEM, GObject)
+
+CcTzItem   *cc_tz_item_new            (TzLocation *location);
+TzLocation *cc_tz_item_get_location   (CcTzItem *self);
+
+G_END_DECLS

panels/datetime/meson.build

@@ -39,6 +39,7 @@ resources = gnome.compile_resources(
 sources = files(
   'cc-datetime-panel.c',
   'cc-timezone-map.c',
+  'cc-tz-item.c',
   'date-endian.c',
   'tz.c'
 )