[gnome-builder] night-light: add switch to follow night-light setting

[Christian Hergert <chergert src gnome org>]

commit 28df37133ab54092e013be8aa1b2eef90ec449c7
Author: Christian Hergert <chergert redhat com>
Date:   Wed Nov 15 20:00:11 2017 -0800

    night-light: add switch to follow night-light setting
    
    This watches the DBus service for changes to the night-light setting. When
    activated, Builder will switch to night mode automatically.
    
    Like night-light, this setting is disabled by default.

 data/gsettings/org.gnome.builder.gschema.xml     |    5 ++
 src/libide/application/ide-application-color.c   |   75 ++++++++++++++++++++++
 src/libide/application/ide-application-private.h |    3 +
 src/libide/application/ide-application.c         |    2 +
 src/libide/application/meson.build               |    1 +
 src/libide/preferences/ide-preferences-builtin.c |    5 +-
 6 files changed, 89 insertions(+), 2 deletions(-)
---
diff --git a/data/gsettings/org.gnome.builder.gschema.xml b/data/gsettings/org.gnome.builder.gschema.xml
index 52b5ca7..d061924 100644
--- a/data/gsettings/org.gnome.builder.gschema.xml
+++ b/data/gsettings/org.gnome.builder.gschema.xml
@@ -20,6 +20,11 @@
       <summary>Night Mode</summary>
       <description>Prefer dark application chrome.</description>
     </key>
+    <key name="follow-night-light" type="b">
+      <default>false</default>
+      <summary>Follow system night light</summary>
+      <description>Use GNOME night light setting to activate night-mode.</description>
+    </key>
     <key name="projects-directory" type="s">
       <default>"Projects"</default>
       <summary>Projects directory</summary>
diff --git a/src/libide/application/ide-application-color.c b/src/libide/application/ide-application-color.c
new file mode 100644
index 0000000..8ab9614
--- /dev/null
+++ b/src/libide/application/ide-application-color.c
@@ -0,0 +1,75 @@
+/* ide-application-color.c
+ *
+ * Copyright (C) 2017 Christian Hergert <chergert redhat com>
+ *
+ * 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/>.
+ */
+
+#define G_LOG_DOMAIN "ide-application-color"
+
+#include "application/ide-application.h"
+#include "application/ide-application-private.h"
+
+static void
+ide_application_color_properties_changed (IdeApplication      *self,
+                                          GVariant            *properties,
+                                          const gchar * const *invalidated,
+                                          GDBusProxy          *proxy)
+{
+  g_assert (IDE_IS_APPLICATION (self));
+  g_assert (G_IS_DBUS_PROXY (proxy));
+
+  if (g_settings_get_boolean (self->settings, "follow-night-light"))
+    {
+      g_autoptr(GVariant) activev = NULL;
+      gboolean active;
+
+      activev = g_dbus_proxy_get_cached_property (proxy, "NightLightActive");
+      active = g_variant_get_boolean (activev);
+
+      if (active != g_settings_get_boolean (self->settings, "night-mode"))
+        g_settings_set_boolean (self->settings, "night-mode", active);
+    }
+}
+
+void
+_ide_application_init_color (IdeApplication *self)
+{
+  g_autoptr(GDBusConnection) conn = NULL;
+  g_autoptr(GDBusProxy) proxy = NULL;
+
+  g_return_if_fail (IDE_IS_APPLICATION (self));
+
+  if (NULL == (conn = g_bus_get_sync (G_BUS_TYPE_SESSION, NULL, NULL)))
+    return;
+
+  if (NULL == (proxy = g_dbus_proxy_new_sync (conn,
+                                              G_DBUS_PROXY_FLAGS_GET_INVALIDATED_PROPERTIES,
+                                              NULL,
+                                              "org.gnome.SettingsDaemon.Color",
+                                              "/org/gnome/SettingsDaemon/Color",
+                                              "org.gnome.SettingsDaemon.Color",
+                                              NULL, NULL)))
+    return;
+
+  g_signal_connect_object (proxy,
+                           "g-properties-changed",
+                           G_CALLBACK (ide_application_color_properties_changed),
+                           self,
+                           G_CONNECT_SWAPPED);
+
+  self->color_proxy = g_steal_pointer (&proxy);
+
+  ide_application_color_properties_changed (self, NULL, NULL, self->color_proxy);
+}
diff --git a/src/libide/application/ide-application-private.h 
b/src/libide/application/ide-application-private.h
index 07f69b2..c2e619b 100644
--- a/src/libide/application/ide-application-private.h
+++ b/src/libide/application/ide-application-private.h
@@ -63,6 +63,8 @@ struct _IdeApplication
   GPtrArray           *reapers;
 
   GSettings           *settings;
+
+  GDBusProxy          *color_proxy;
 };
 
 void     ide_application_discover_plugins           (IdeApplication        *self) G_GNUC_INTERNAL;
@@ -83,6 +85,7 @@ void     ide_application_open_async                 (IdeApplication        *self
 gboolean ide_application_open_finish                (IdeApplication        *self,
                                                      GAsyncResult          *reuslt,
                                                      GError               **error);
+void     _ide_application_init_color                (IdeApplication        *self);
 void     _ide_application_init_shortcuts            (IdeApplication        *self);
 void     _ide_application_set_mode                  (IdeApplication        *self,
                                                      IdeApplicationMode     mode);
diff --git a/src/libide/application/ide-application.c b/src/libide/application/ide-application.c
index 5842a87..830ebf2 100644
--- a/src/libide/application/ide-application.c
+++ b/src/libide/application/ide-application.c
@@ -417,6 +417,7 @@ ide_application_startup (GApplication *application)
       ide_application_register_keybindings (self);
       ide_application_actions_init (self);
       _ide_application_init_shortcuts (self);
+      _ide_application_init_color (self);
 
       modeline_parser_init ();
     }
@@ -520,6 +521,7 @@ ide_application_finalize (GObject *object)
   g_clear_object (&self->keybindings);
   g_clear_object (&self->recent_projects);
   g_clear_object (&self->settings);
+  g_clear_object (&self->color_proxy);
 
   G_OBJECT_CLASS (ide_application_parent_class)->finalize (object);
 }
diff --git a/src/libide/application/meson.build b/src/libide/application/meson.build
index 4632564..5a55d08 100644
--- a/src/libide/application/meson.build
+++ b/src/libide/application/meson.build
@@ -15,6 +15,7 @@ application_sources = [
 application_private_sources = [
   'ide-application-actions.c',
   'ide-application-actions.h',
+  'ide-application-color.c',
   'ide-application-command-line.c',
   'ide-application-plugins.c',
   'ide-application-private.h',
diff --git a/src/libide/preferences/ide-preferences-builtin.c 
b/src/libide/preferences/ide-preferences-builtin.c
index 105b49c..4083ad6 100644
--- a/src/libide/preferences/ide-preferences-builtin.c
+++ b/src/libide/preferences/ide-preferences-builtin.c
@@ -98,8 +98,9 @@ ide_preferences_builtin_register_appearance (DzlPreferences *preferences)
   dzl_preferences_add_page (preferences, "appearance", _("Appearance"), 0);
 
   dzl_preferences_add_list_group (preferences, "appearance", "basic", _("Themes"), GTK_SELECTION_NONE, 0);
-  dark_mode = dzl_preferences_add_switch (preferences, "appearance", "basic", "org.gnome.builder", 
"night-mode", NULL, NULL, _("Dark Theme"), _("Whether Builder should use a dark theme"), _("dark theme"), 0);
-  dzl_preferences_add_switch (preferences, "appearance", "basic", "org.gnome.builder.editor", 
"show-grid-lines", NULL, NULL, _("Grid Pattern"), _("Display a grid pattern underneath source code"), NULL, 
0);
+  dark_mode = dzl_preferences_add_switch (preferences, "appearance", "basic", "org.gnome.builder", 
"night-mode", NULL, NULL, _("Dark Mode"), _("Whether Builder should use a dark theme"), _("dark theme"), 0);
+  dzl_preferences_add_switch (preferences, "appearance", "basic", "org.gnome.builder", "follow-night-light", 
NULL, NULL, _("Night Light"), _("Automatically enable dark mode at night"), _("follow night light"), 5);
+  dzl_preferences_add_switch (preferences, "appearance", "basic", "org.gnome.builder.editor", 
"show-grid-lines", NULL, NULL, _("Grid Pattern"), _("Display a grid pattern underneath source code"), NULL, 
10);
 
   dzl_preferences_add_list_group (preferences, "appearance", "font", _("Font"), GTK_SELECTION_NONE, 10);
   dzl_preferences_add_font_button (preferences, "appearance", "font", "org.gnome.builder.editor", 
"font-name", _("Editor"), C_("Keywords", "editor font monospace"), 0);