1 files changed, 48 insertions, 0 deletions
diff --git a/launcher/groupview/GroupedProxyModel.cpp b/launcher/groupview/GroupedProxyModel.cpp
new file mode 100644
index 00000000..dc4212d5
--- /dev/null
+++ b/launcher/groupview/GroupedProxyModel.cpp
@@ -0,0 +1,48 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "GroupedProxyModel.h"
+
+#include "GroupView.h"
+#include <QDebug>
+
+GroupedProxyModel::GroupedProxyModel(QObject *parent) : QSortFilterProxyModel(parent)
+{
+}
+
+bool GroupedProxyModel::lessThan(const QModelIndex &left, const QModelIndex &right) const
+{
+    const QString leftCategory = left.data(GroupViewRoles::GroupRole).toString();
+    const QString rightCategory = right.data(GroupViewRoles::GroupRole).toString();
+    if (leftCategory == rightCategory)
+    {
+        return subSortLessThan(left, right);
+    }
+    else
+    {
+        // FIXME: real group sorting happens in GroupView::updateGeometries(), see LocaleString
+        auto result = leftCategory.localeAwareCompare(rightCategory);
+        if(result == 0)
+        {
+            return subSortLessThan(left, right);
+        }
+        return result < 0;
+    }
+}
+
+bool GroupedProxyModel::subSortLessThan(const QModelIndex &left, const QModelIndex &right) const
+{
+    return left.row() < right.row();
+}