1 files changed, 63 insertions, 0 deletions
diff --git a/libgjs-private/gjs-gtk-util.c b/libgjs-private/gjs-gtk-util.c
new file mode 100644
index 0000000..4a6cebf
--- /dev/null
+++ b/libgjs-private/gjs-gtk-util.c
@@ -0,0 +1,63 @@
+/* -*- mode: C; c-basic-offset: 4; indent-tabs-mode: nil; -*- */
+/* Copyright 2014 Endless Mobile, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <config.h>
+#include <gtk/gtk.h>
+
+#include "gjs-gtk-util.h"
+
+void
+gjs_gtk_container_child_set_property(GtkContainer* container,
+                                     GtkWidget* child,
+                                     const gchar* property,
+                                     const GValue* value)
+{
+    GParamSpec* pspec;
+
+    pspec
+      = gtk_container_class_find_child_property(G_OBJECT_GET_CLASS(container),
+                                                property);
+    if (pspec == NULL) {
+        g_warning("%s does not have a property called %s",
+                  g_type_name(G_OBJECT_TYPE(container)), property);
+        return;
+    }
+
+    if ((G_VALUE_TYPE(value) == G_TYPE_POINTER)
+        && (g_value_get_pointer(value) == NULL)
+        && !g_value_type_transformable(G_VALUE_TYPE(value),
+                                       pspec->value_type)) {
+        /* Set an empty value. This will happen when we set a NULL value from
+         * JS.
+         * Since GJS doesn't know the GParamSpec for this property, it
+         * will just put NULL into a G_TYPE_POINTER GValue, which will later
+         * fail when trying to transform it to the GParamSpec's GType.
+         */
+        GValue null_value = G_VALUE_INIT;
+        g_value_init(&null_value, pspec->value_type);
+        gtk_container_child_set_property(container, child, property,
+                                         &null_value);
+        g_value_unset(&null_value);
+    } else {
+        gtk_container_child_set_property(container, child, property, value);
+    }
+}