server-context-service: Don't show keyboard when disabled

If the corresponding a11y settings is disbaled don't unfold
the keyboad at all.

This helps e.g. running the same session on laptops or when
an external keyboard is attached.

Closes: #222

src/server-context-service.c

@@ -31,6 +31,7 @@
 enum {
     PROP_0,
     PROP_VISIBLE,
+    PROP_ENABLED,
     PROP_LAST
 };
 
@@ -44,6 +45,7 @@ struct _ServerContextService {
     struct ui_manager *manager; // unowned
 
     gboolean visible;
+    gboolean enabled;
     PhoshLayerSurface *window;
     GtkWidget *widget; // nullable
     guint hiding;
@@ -208,6 +210,9 @@ on_hide (ServerContextService *self)
 static void
 server_context_service_real_show_keyboard (ServerContextService *self)
 {
+    if (!self->enabled)
+        return;
+
     if (self->hiding) {
 	    g_source_remove (self->hiding);
 	    self->hiding = 0;
@@ -263,7 +268,9 @@ server_context_service_set_property (GObject      *object,
     case PROP_VISIBLE:
         self->visible = g_value_get_boolean (value);
         break;
-
+    case PROP_ENABLED:
+        server_context_service_set_enabled (self, g_value_get_boolean (value));
+        break;
     default:
         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
         break;
@@ -319,11 +326,43 @@ server_context_service_class_init (ServerContextServiceClass *klass)
     g_object_class_install_property (gobject_class,
                                      PROP_VISIBLE,
                                      pspec);
+
+    /**
+     * ServerContextServie:keyboard:
+     *
+     * Does the user want the keyboard to show up automatically?
+     */
+    pspec =
+        g_param_spec_boolean ("enabled",
+                              "Enabled",
+                              "Whether the keyboard is enabled",
+                              TRUE,
+                              G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
+    g_object_class_install_property (gobject_class,
+                                     PROP_ENABLED,
+                                     pspec);
 }
 
 static void
 server_context_service_init (ServerContextService *self) {
-    (void)self;
+    const char *schema_name = "org.gnome.desktop.a11y.applications";
+    GSettingsSchemaSource *ssrc = g_settings_schema_source_get_default();
+    g_autoptr(GSettingsSchema) schema = NULL;
+
+    self->enabled = TRUE;
+    if (!ssrc) {
+        g_warning("No gsettings schemas installed.");
+        return;
+    }
+    schema = g_settings_schema_source_lookup(ssrc, schema_name, TRUE);
+    if (schema) {
+        g_autoptr(GSettings) settings = g_settings_new (schema_name);
+        g_settings_bind (settings, "screen-keyboard-enabled",
+                         self, "enabled", G_SETTINGS_BIND_GET);
+    } else {
+        g_warning("Gsettings schema %s is not installed on the system. "
+                  "Enabling by default.", schema_name);
+    }
 }
 
 ServerContextService *
@@ -336,3 +375,18 @@ server_context_service_new (EekboardContextService *self, struct submission *sub
     ui->manager = uiman;
     return ui;
 }
+
+void
+server_context_service_set_enabled (ServerContextService *self, gboolean enabled)
+{
+    g_return_if_fail (SERVER_IS_CONTEXT_SERVICE (self));
+
+    if (enabled == self->enabled)
+        return;
+
+    self->enabled = enabled;
+    if (self->enabled)
+        server_context_service_show_keyboard (self);
+    else
+        server_context_service_hide_keyboard (self);
+}

src/server-context-service.h

@@ -33,6 +33,7 @@ ServerContextService *server_context_service_new(EekboardContextService *self, s
 enum squeek_arrangement_kind server_context_service_get_layout_type(ServerContextService *);
 void server_context_service_show_keyboard (ServerContextService *self);
 void server_context_service_hide_keyboard (ServerContextService *self);
+void server_context_service_set_enabled (ServerContextService *self, gboolean enabled);
 G_END_DECLS
 #endif  /* SERVER_CONTEXT_SERVICE_H */