Dump of hello world ifc viewer code

src/ifcviewer/AppSettings.cpp

@@ -0,0 +1,57 @@
+/********************************************************************************
+ *                                                                              *
+ * This file is part of IfcOpenShell.                                           *
+ *                                                                              *
+ * IfcOpenShell is free software: you can redistribute it and/or modify         *
+ * it under the terms of the Lesser GNU General Public License as published by  *
+ * the Free Software Foundation, either version 3.0 of the License, or          *
+ * (at your option) any later version.                                          *
+ *                                                                              *
+ * IfcOpenShell 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                 *
+ * Lesser GNU General Public License for more details.                          *
+ *                                                                              *
+ * You should have received a copy of the Lesser GNU General Public License     *
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.         *
+ *                                                                              *
+ ********************************************************************************/
+
+#include "AppSettings.h"
+
+#include <QSettings>
+
+namespace {
+constexpr const char* kGeometryLibraryKey = "geometry/library";
+constexpr const char* kGeometryLibraryDefault = "hybrid-cgal-simple-opencascade";
+}
+
+AppSettings& AppSettings::instance() {
+    static AppSettings inst;
+    return inst;
+}
+
+AppSettings::AppSettings() {
+    load();
+}
+
+QString AppSettings::geometryLibrary() const {
+    return geometry_library_;
+}
+
+void AppSettings::setGeometryLibrary(const QString& value) {
+    if (geometry_library_ == value) return;
+    geometry_library_ = value;
+    persist();
+    emit geometryLibraryChanged(value);
+}
+
+void AppSettings::load() {
+    QSettings settings;
+    geometry_library_ = settings.value(kGeometryLibraryKey, kGeometryLibraryDefault).toString();
+}
+
+void AppSettings::persist() {
+    QSettings settings;
+    settings.setValue(kGeometryLibraryKey, geometry_library_);
+}