Added QtFilterLeafNodes from batch_widget_prototype branch.

Re #22263

qt/widgets/common/CMakeLists.txt

@@ -84,6 +84,7 @@ set ( SRC_FILES
   src/Batch/JobTreeView.cpp
   src/Batch/JobTreeViewSignalAdapter.cpp
   src/Batch/QtStandardItemTreeAdapter.cpp
+  src/Batch/QtFilterLeafNodes.cpp
   src/Batch/QtTreeCursorNavigation.cpp
   src/Batch/CellDelegate.cpp
   src/Batch/BuildSubtree.cpp
@@ -399,6 +400,7 @@ set ( INC_FILES
   inc/MantidQtWidgets/Common/FindFilesWorker.h
   inc/MantidQtWidgets/Common/Batch/QtStandardItemTreeAdapter.h
   inc/MantidQtWidgets/Common/Batch/QtTreeCursorNavigation.h
+  inc/MantidQtWidgets/Common/Batch/QtFilterLeafNodes.h
   inc/MantidQtWidgets/Common/Batch/RowLocation.h
   inc/MantidQtWidgets/Common/Batch/Row.h
   inc/MantidQtWidgets/Common/Batch/CellDelegate.h

qt/widgets/common/inc/MantidQtWidgets/Common/Batch/QtFilterLeafNodes.h

+#ifndef MANTIDQTMANTIDWIDGETS_FILTERLEAFNODES_H_
+#define MANTIDQTMANTIDWIDGETS_FILTERLEAFNODES_H_
+#include <QSortFilterProxyModel>
+namespace MantidQt {
+namespace MantidWidgets {
+namespace Batch {
+
+class QtFilterLeafNodes : public QSortFilterProxyModel {
+public:
+  QtFilterLeafNodes(QObject *parent = nullptr);
+
+protected:
+  bool filterAcceptsRow(int row, const QModelIndex &parent) const override;
+};
+}
+}
+}
+#endif // MANTIDQTMANTIDWIDGETS_FILTERLEAFNODES_H_

qt/widgets/common/src/Batch/QtFilterLeafNodes.cpp

+#include "MantidQtWidgets/Common/Batch/QtFilterLeafNodes.h"
+namespace MantidQt {
+namespace MantidWidgets {
+namespace Batch {
+QtFilterLeafNodes::QtFilterLeafNodes(QObject *parent)
+    : QSortFilterProxyModel(parent){}
+
+bool QtFilterLeafNodes::filterAcceptsRow(int row,
+                                         const QModelIndex &parent) const {
+  auto index = sourceModel()->index(row, 0, parent);
+  if (index.isValid()) {
+    if (index.data().toString().contains(filterRegExp()))
+      return true;
+
+    int rows = sourceModel()->rowCount(index);
+    for (auto r = 0; r < rows; r++)
+      if (filterAcceptsRow(r, index))
+        return true;
+    return false;
+  } else {
+    return false;
+  }
+}
+}
+}
+}