[mutter/wip/carlosg/centralized-panel-auto-orientation: 6/8] backends: Centralize panel autorotation in a DisplayConfig property

[Carlos Garnacho <carlosg src gnome org>]

commit 1acf7444731d1fec90ae07994a649377d402d3c8
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu Jun 11 18:15:22 2020 +0200

    backends: Centralize panel autorotation in a DisplayConfig property
    
    Instead of having everyone check net.hadess.SensorProxy themselves, have
    this all controlled by the MetaOrientationManager, and proxied everywhere
    else via a readonly property in org.gnome.Mutter.DisplayConfig.
    
    We want to attach more complex policies here, and it seems better to
    centralize the handling of the autorotation feature rather than
    implementing policy changes all over the place.
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1311

 src/backends/meta-monitor-manager-private.h |  2 ++
 src/backends/meta-monitor-manager.c         | 49 +++++++++++++++++++++++++++++
 src/meta/meta-monitor-manager.h             |  3 ++
 src/org.gnome.Mutter.DisplayConfig.xml      |  8 +++++
 4 files changed, 62 insertions(+)
---
diff --git a/src/backends/meta-monitor-manager-private.h b/src/backends/meta-monitor-manager-private.h
index 1b7efd261b..7df72f7162 100644
--- a/src/backends/meta-monitor-manager-private.h
+++ b/src/backends/meta-monitor-manager-private.h
@@ -129,6 +129,8 @@ struct _MetaMonitorManager
 
   int persistent_timeout_id;
 
+  guint panel_orientation_managed : 1;
+
   MetaMonitorConfigManager *config_manager;
 
   GnomePnpIds *pnp_ids;
diff --git a/src/backends/meta-monitor-manager.c b/src/backends/meta-monitor-manager.c
index a519442f32..ee255ab749 100644
--- a/src/backends/meta-monitor-manager.c
+++ b/src/backends/meta-monitor-manager.c
@@ -67,6 +67,7 @@ enum
   PROP_0,
 
   PROP_BACKEND,
+  PROP_PANEL_ORIENTATION_MANAGED,
 
   PROP_LAST
 };
@@ -748,6 +749,28 @@ experimental_features_changed (MetaSettings           *settings,
   meta_settings_update_ui_scaling_factor (settings);
 }
 
+static void
+update_panel_orientation_managed (MetaMonitorManager *manager)
+{
+  MetaOrientationManager *orientation_manager;
+  gboolean panel_orientation_managed;
+
+  orientation_manager = meta_backend_get_orientation_manager (manager->backend);
+
+  panel_orientation_managed =
+    meta_orientation_manager_has_accelerometer (orientation_manager);
+
+  if (manager->panel_orientation_managed == panel_orientation_managed)
+    return;
+
+  manager->panel_orientation_managed = panel_orientation_managed;
+  g_object_notify_by_pspec (G_OBJECT (manager),
+                            obj_props[PROP_PANEL_ORIENTATION_MANAGED]);
+
+  meta_dbus_display_config_set_panel_orientation_managed (manager->display_config,
+                                                          manager->panel_orientation_managed);
+}
+
 void
 meta_monitor_manager_setup (MetaMonitorManager *manager)
 {
@@ -788,6 +811,11 @@ meta_monitor_manager_constructed (GObject *object)
                            G_CALLBACK (orientation_changed),
                            manager, 0);
 
+  g_signal_connect_object (meta_backend_get_orientation_manager (backend),
+                           "notify::has-accelerometer",
+                           G_CALLBACK (update_panel_orientation_managed), manager,
+                           G_CONNECT_SWAPPED);
+
   g_signal_connect_object (backend,
                            "lid-is-closed-changed",
                            G_CALLBACK (lid_is_closed_changed),
@@ -848,6 +876,7 @@ meta_monitor_manager_set_property (GObject      *object,
     case PROP_BACKEND:
       manager->backend = g_value_get_object (value);
       break;
+    case PROP_PANEL_ORIENTATION_MANAGED:
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
     }
@@ -866,6 +895,9 @@ meta_monitor_manager_get_property (GObject    *object,
     case PROP_BACKEND:
       g_value_set_object (value, manager->backend);
       break;
+    case PROP_PANEL_ORIENTATION_MANAGED:
+      g_value_set_boolean (value, manager->panel_orientation_managed);
+      break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
     }
@@ -925,6 +957,15 @@ meta_monitor_manager_class_init (MetaMonitorManagerClass *klass)
                          G_PARAM_READWRITE |
                          G_PARAM_CONSTRUCT_ONLY |
                          G_PARAM_STATIC_STRINGS);
+
+  obj_props[PROP_PANEL_ORIENTATION_MANAGED] =
+    g_param_spec_boolean ("panel-orientation-managed",
+                          "Panel orientation managed",
+                          "Panel orientation is managed",
+                          FALSE,
+                          G_PARAM_READABLE |
+                          G_PARAM_EXPLICIT_NOTIFY |
+                          G_PARAM_STATIC_STRINGS);
   g_object_class_install_properties (object_class, PROP_LAST, obj_props);
 }
 
@@ -3175,3 +3216,11 @@ meta_monitor_manager_get_vendor_name (MetaMonitorManager *manager,
 
   return gnome_pnp_ids_get_pnp_id (manager->pnp_ids, vendor);
 }
+
+gboolean
+meta_monitor_manager_get_panel_orientation_managed (MetaMonitorManager *manager)
+{
+  g_return_val_if_fail (META_IS_MONITOR_MANAGER (manager), FALSE);
+
+  return manager->panel_orientation_managed;
+}
diff --git a/src/meta/meta-monitor-manager.h b/src/meta/meta-monitor-manager.h
index 033309cc8a..ce57156be5 100644
--- a/src/meta/meta-monitor-manager.h
+++ b/src/meta/meta-monitor-manager.h
@@ -62,4 +62,7 @@ MetaMonitorSwitchConfigType meta_monitor_manager_get_switch_config (MetaMonitorM
 META_EXPORT
 gint meta_monitor_manager_get_display_configuration_timeout (void);
 
+META_EXPORT
+gboolean meta_monitor_manager_get_panel_orientation_managed (MetaMonitorManager *manager);
+
 #endif /* META_MONITOR_MANAGER_H */
diff --git a/src/org.gnome.Mutter.DisplayConfig.xml b/src/org.gnome.Mutter.DisplayConfig.xml
index 495bebca19..044244e492 100644
--- a/src/org.gnome.Mutter.DisplayConfig.xml
+++ b/src/org.gnome.Mutter.DisplayConfig.xml
@@ -282,6 +282,14 @@
     -->
     <property name="PowerSaveMode" type="i" access="readwrite" />
 
+    <!--
+        PanelOrientationManaged:
+
+        Whether the built-in panel orientation is automatically managed
+        by mutter.
+    -->
+    <property name="PanelOrientationManaged" type="b" access="read" />
+
     <!--
         MonitorsChanged: