1 files changed, 68 insertions, 0 deletions
diff --git a/src/ui/builder-utils.h b/src/ui/builder-utils.h
new file mode 100644
index 0000000..83fd059
--- /dev/null
+++ b/src/ui/builder-utils.h
@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * @brief Gtk builder utilities
+ */
+/* Authors:
+ *   Michael Kowalski
+ *
+ * Copyright (C) 2021 Michael Kowalski
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_BUILDER_UTILS_H
+#define SEEN_BUILDER_UTILS_H
+
+#include <glibmm/refptr.h>
+#include <gtkmm/builder.h>
+
+namespace Inkscape {
+namespace UI {
+
+// get widget from builder or throw
+template<class W> W& get_widget(const Glib::RefPtr<Gtk::Builder>& builder, const char* id) {
+    W* widget;
+    builder->get_widget(id, widget);
+    if (!widget) {
+        throw std::runtime_error("Missing widget in a glade resource file");
+    }
+    return *widget;
+}
+
+template<class W, typename... Args>
+W& get_derived_widget(const Glib::RefPtr<Gtk::Builder>& builder, const char* id, Args&&... args) {
+    W* widget;
+    builder->get_widget_derived(id, widget, std::forward<Args>(args)...);
+    if (!widget) {
+        throw std::runtime_error("Missing widget in a glade resource file");
+    }
+    return *widget;
+}
+
+template<class Ob> Glib::RefPtr<Ob> get_object(Glib::RefPtr<Gtk::Builder>& builder, const char* id) {
+    auto object = Glib::RefPtr<Ob>::cast_dynamic(builder->get_object(id));
+    if (!object) {
+        throw std::runtime_error("Missing object in a glade resource file");
+    }
+    return object;
+}
+
+/**
+ * This version of get_object is needed for Gtk::CellRenderer objects which can not be
+ * put into Glib::RefPtr by the compiler, but are somehow passed to us as RefPtrs anyway.
+ */
+template <class Ob>
+Ob &get_object_raw(Glib::RefPtr<Gtk::Builder> &builder, const char *id)
+{
+    auto object = dynamic_cast<Ob *>(builder->get_object(id).get());
+    if (!object) {
+        throw std::runtime_error("Missing object in a glade resource file");
+    }
+    return *object;
+}
+
+// load glade file from share/ui folder and return builder; throws on errors
+Glib::RefPtr<Gtk::Builder> create_builder(const char* filename);
+
+} } // namespace
+
+#endif // SEEN_BUILDER_UTILS_H