gnome-control-center/SOURCES/0001-display-Only-display-configuration-options-if-apply-.patch

From 22c43422f83a69d7654953db368585f168952aab Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jonas=20=C3=85dahl?= <jadahl@gmail.com>
Date: Fri, 4 Feb 2022 11:45:53 +0100
Subject: [PATCH] display: Only display configuration options if apply is
 allowed

org.gnome.Mutter.DisplayConfig contains a new property that tells
whether apply will be allowed to be called or not. Whether it is true or
not depends on policy stored in any of its monitors.xml configuration
files.

In order to make it clearer that configuration is not possible, except
for night light, make sure to hide the unconfigurable parts, leaving
only night light.
---
 .../display/cc-display-config-manager-dbus.c  | 36 +++++++++++++++++++
 panels/display/cc-display-config-manager.c    |  6 ++++
 panels/display/cc-display-config-manager.h    |  3 ++
 panels/display/cc-display-panel.c             | 23 ++++++++++++
 4 files changed, 68 insertions(+)

diff --git a/panels/display/cc-display-config-manager-dbus.c b/panels/display/cc-display-config-manager-dbus.c
index 8912faaa8..7f85c3a01 100644
--- a/panels/display/cc-display-config-manager-dbus.c
+++ b/panels/display/cc-display-config-manager-dbus.c
@@ -31,6 +31,8 @@ struct _CcDisplayConfigManagerDBus
   guint monitors_changed_id;
 
   GVariant *current_state;
+
+  gboolean apply_allowed;
 };
 
 G_DEFINE_TYPE (CcDisplayConfigManagerDBus,
@@ -119,6 +121,8 @@ bus_gotten (GObject      *object,
   CcDisplayConfigManagerDBus *self;
   GDBusConnection *connection;
   GError *error = NULL;
+  g_autoptr(GDBusProxy) proxy = NULL;
+  g_autoptr(GVariant) variant = NULL;
 
   connection = g_bus_get_finish (result, &error);
   if (!connection)
@@ -145,12 +149,35 @@ bus_gotten (GObject      *object,
                                         monitors_changed,
                                         self,
                                         NULL);
+
+  proxy = g_dbus_proxy_new_sync (self->connection,
+                                 G_DBUS_PROXY_FLAGS_NONE,
+                                 NULL,
+                                 "org.gnome.Mutter.DisplayConfig",
+                                 "/org/gnome/Mutter/DisplayConfig",
+                                 "org.gnome.Mutter.DisplayConfig",
+                                 NULL,
+                                 &error);
+  if (!proxy)
+    {
+      g_warning ("Failed to create D-Bus proxy to \"org.gnome.Mutter.DisplayConfig\": %s",
+                 error->message);
+      return;
+    }
+
+  variant = g_dbus_proxy_get_cached_property (proxy, "ApplyMonitorsConfigAllowed");
+  if (variant)
+    self->apply_allowed = g_variant_get_boolean (variant);
+  else
+    g_warning ("Missing property 'ApplyMonitorsConfigAllowed' on DisplayConfig API");
+
   get_current_state (self);
 }
 
 static void
 cc_display_config_manager_dbus_init (CcDisplayConfigManagerDBus *self)
 {
+  self->apply_allowed = TRUE;
   self->cancellable = g_cancellable_new ();
   g_bus_get (G_BUS_TYPE_SESSION, self->cancellable, bus_gotten, self);
 }
@@ -172,6 +199,14 @@ cc_display_config_manager_dbus_finalize (GObject *object)
   G_OBJECT_CLASS (cc_display_config_manager_dbus_parent_class)->finalize (object);
 }
 
+static gboolean
+cc_display_config_manager_dbus_get_apply_allowed (CcDisplayConfigManager *pself)
+{
+  CcDisplayConfigManagerDBus *self = CC_DISPLAY_CONFIG_MANAGER_DBUS (pself);
+
+  return self->apply_allowed;
+}
+
 static void
 cc_display_config_manager_dbus_class_init (CcDisplayConfigManagerDBusClass *klass)
 {
@@ -181,6 +216,7 @@ cc_display_config_manager_dbus_class_init (CcDisplayConfigManagerDBusClass *klas
   gobject_class->finalize = cc_display_config_manager_dbus_finalize;
 
   parent_class->get_current = cc_display_config_manager_dbus_get_current;
+  parent_class->get_apply_allowed = cc_display_config_manager_dbus_get_apply_allowed;
 }
 
 CcDisplayConfigManager *
diff --git a/panels/display/cc-display-config-manager.c b/panels/display/cc-display-config-manager.c
index 0da298a29..3d683c53d 100644
--- a/panels/display/cc-display-config-manager.c
+++ b/panels/display/cc-display-config-manager.c
@@ -59,3 +59,9 @@ cc_display_config_manager_get_current (CcDisplayConfigManager *self)
 {
   return CC_DISPLAY_CONFIG_MANAGER_GET_CLASS (self)->get_current (self);
 }
+
+gboolean
+cc_display_config_manager_get_apply_allowed (CcDisplayConfigManager *self)
+{
+  return CC_DISPLAY_CONFIG_MANAGER_GET_CLASS (self)->get_apply_allowed (self);
+}
diff --git a/panels/display/cc-display-config-manager.h b/panels/display/cc-display-config-manager.h
index 134cea0a1..22c16758c 100644
--- a/panels/display/cc-display-config-manager.h
+++ b/panels/display/cc-display-config-manager.h
@@ -35,10 +35,13 @@ struct _CcDisplayConfigManagerClass
   GObjectClass parent_class;
 
   CcDisplayConfig * (*get_current) (CcDisplayConfigManager *self);
+  gboolean (* get_apply_allowed) (CcDisplayConfigManager *self);
 };
 
 CcDisplayConfig * cc_display_config_manager_get_current (CcDisplayConfigManager *self);
 
+gboolean cc_display_config_manager_get_apply_allowed (CcDisplayConfigManager *self);
+
 void _cc_display_config_manager_emit_changed (CcDisplayConfigManager *self);
 
 G_END_DECLS
diff --git a/panels/display/cc-display-panel.c b/panels/display/cc-display-panel.c
index 0b4fa193d..1b0db8321 100644
--- a/panels/display/cc-display-panel.c
+++ b/panels/display/cc-display-panel.c
@@ -1245,6 +1245,22 @@ make_output_ui (CcDisplayPanel *panel)
   return listbox;
 }
 
+static GtkWidget *
+make_night_light_only_ui (CcDisplayPanel *panel)
+{
+  CcDisplayPanelPrivate *priv = panel->priv;
+  GtkWidget *vbox;
+
+  priv->rows_size_group = gtk_size_group_new (GTK_SIZE_GROUP_BOTH);
+
+  vbox = make_main_vbox (priv->main_size_group);
+
+  gtk_container_add (GTK_CONTAINER (vbox), make_night_light_widget (panel));
+
+  g_clear_object (&priv->rows_size_group);
+  return make_scrollable (vbox);
+}
+
 static GtkWidget *
 make_single_output_ui (CcDisplayPanel *panel)
 {
@@ -2097,6 +2113,12 @@ on_screen_changed (CcDisplayPanel *panel)
   if (!priv->current_config)
     goto show_error;
 
+  if (!cc_display_config_manager_get_apply_allowed (priv->manager))
+    {
+      main_widget = make_night_light_only_ui (panel);
+      goto show_main_widget;
+    }
+
   ensure_monitor_labels (panel);
 
   if (!priv->current_output)
@@ -2121,6 +2143,7 @@ on_screen_changed (CcDisplayPanel *panel)
         main_widget = make_multi_output_ui (panel);
     }
 
+ show_main_widget:
   gtk_widget_show_all (main_widget);
   gtk_stack_add_named (GTK_STACK (priv->stack), main_widget, "main");
   gtk_stack_set_visible_child (GTK_STACK (priv->stack), main_widget);
-- 
2.33.1