[Mon / Qt Apps] Fixed filter-function

The MultiColumnSortFilterProxyModel now supports QRegexp and QRegularExpression depending on the Qt Version

lib/CustomQt/src/QMulticolumnSortFilterProxyModel.cpp

@@ -57,7 +57,14 @@ QVector<int> QMulticolumnSortFilterProxyModel::filterKeyColumns() const
 
 bool QMulticolumnSortFilterProxyModel::filterDirectAcceptsRow(int source_row, const QModelIndex &source_parent) const
 {
-  QRegularExpression const filter_regexp = filterRegularExpression();
+  // Qt 5 uses the deprecated QRegExp by default when setting a FilterFixedString. The QRegularExpression is then empty
+  //      QRegularExpression didn't even exist in Qt 5.11 and earlier
+  // Qt 6 sets the QRegularExpression (QRegExp does not exist anymore) when setting a FilterFixedString.
+
+#if QT_VERSION < QT_VERSION_CHECK(5, 12, 0)
+  // For Qt5.11 there only exists the RegExp, so we need to check the QRegExp
+
+  QRegExp const filter_regexp = filterRegExp();
 
   for (int column : filter_columns_)
   {
@@ -72,6 +79,65 @@ bool QMulticolumnSortFilterProxyModel::filterDirectAcceptsRow(int source_row, co
     }
   }
   return false;
+
+#elif QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
+  // For Qt5.12 - 5.15 (i.e. pre-Qt6) we need to check the QRegExp and the QRegularExpression
+  QRegExp const filter_regexp = filterRegExp();
+
+  if (!filter_regexp.isEmpty())
+  {
+    // Use QRegExp
+    for (int column : filter_columns_)
+    {
+      QModelIndex index = sourceModel()->index(source_row, column, source_parent);
+      if (index.isValid())
+      {
+        QString data = sourceModel()->data(index, filterRole()).toString();
+        if (data.contains(filter_regexp))
+        {
+          return true;
+        }
+      }
+    }
+    return false;
+  }
+  else
+  {
+    // Use QRegularExpression, as QRegExp is empty
+    QRegularExpression const filter_regularexpression = filterRegularExpression();
+
+    for (int column : filter_columns_)
+    {
+      QModelIndex index = sourceModel()->index(source_row, column, source_parent);
+      if (index.isValid())
+      {
+        QString data = sourceModel()->data(index, filterRole()).toString();
+        if (data.contains(filter_regularexpression))
+        {
+          return true;
+        }
+      }
+    }
+    return false;
+  }
+#else
+  // For Qt6 we only need to check the QRegularExpression
+  QRegularExpression const filter_regularexpression = filterRegularExpression();
+
+  for (int column : filter_columns_)
+  {
+    QModelIndex index = sourceModel()->index(source_row, column, source_parent);
+    if (index.isValid())
+    {
+      QString data = sourceModel()->data(index, filterRole()).toString();
+      if (data.contains(filter_regularexpression))
+      {
+        return true;
+      }
+    }
+  }
+  return false;
+#endif
 }
 
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