1 files changed, 82 insertions, 0 deletions
diff --git a/src/gui/WidgetFactory.cpp b/src/gui/WidgetFactory.cpp
new file mode 100644
index 00000000..3a71425d
--- /dev/null
+++ b/src/gui/WidgetFactory.cpp
@@ -0,0 +1,82 @@
+/*
+  This file is part of Ingen.
+  Copyright 2007-2015 David Robillard <http://drobilla.net/>
+
+  Ingen is free software: you can redistribute it and/or modify it under the
+  terms of the GNU Affero General Public License as published by the Free
+  Software Foundation, either version 3 of the License, or any later version.
+
+  Ingen is distributed in the hope that it will be useful, but WITHOUT ANY
+  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+  A PARTICULAR PURPOSE.  See the GNU Affero General Public License for details.
+
+  You should have received a copy of the GNU Affero General Public License
+  along with Ingen.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "WidgetFactory.hpp"
+
+#include "ingen/Log.hpp"
+#include "ingen/runtime_paths.hpp"
+
+#include <cstdlib>
+#include <fstream>
+#include <stdexcept>
+#include <string>
+
+namespace ingen {
+namespace gui {
+
+Glib::ustring WidgetFactory::ui_filename = "";
+
+inline static bool
+is_readable(const std::string& filename)
+{
+	std::ifstream fs(filename.c_str());
+	const bool fail = fs.fail();
+	fs.close();
+	return !fail;
+}
+
+void
+WidgetFactory::find_ui_file()
+{
+	// Try file in bundle (directory where executable resides)
+	ui_filename = ingen::bundle_file_path("ingen_gui.ui");
+	if (is_readable(ui_filename)) {
+		return;
+	}
+
+	// Try ENGINE_UI_PATH from the environment
+	const char* const env_path = getenv("INGEN_UI_PATH");
+	if (env_path && is_readable(env_path)) {
+		ui_filename = env_path;
+		return;
+	}
+
+	// Try the default system installed path
+	ui_filename = ingen::data_file_path("ingen_gui.ui");
+	if (is_readable(ui_filename)) {
+		return;
+	}
+
+	throw std::runtime_error(fmt("Unable to find ingen_gui.ui in %1%\n",
+	                             INGEN_DATA_DIR));
+}
+
+Glib::RefPtr<Gtk::Builder>
+WidgetFactory::create(const std::string& toplevel_widget)
+{
+	if (ui_filename.empty()) {
+		find_ui_file();
+	}
+
+	if (toplevel_widget.empty()) {
+		return Gtk::Builder::create_from_file(ui_filename);
+	} else {
+		return Gtk::Builder::create_from_file(ui_filename, toplevel_widget.c_str());
+	}
+}
+
+} // namespace gui
+} // namespace ingen