1 files changed, 150 insertions, 0 deletions
diff --git a/sc/inc/sharedformula.hxx b/sc/inc/sharedformula.hxx
new file mode 100644
index 000000000..c61ce62b6
--- /dev/null
+++ b/sc/inc/sharedformula.hxx
@@ -0,0 +1,150 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_SC_INC_SHAREDFORMULA_HXX
+#define INCLUDED_SC_INC_SHAREDFORMULA_HXX
+
+#include "formulacell.hxx"
+#include "mtvelements.hxx"
+
+#include <vector>
+
+#define USE_FORMULA_GROUP_LISTENER 1
+
+namespace sc {
+
+class StartListeningContext;
+
+class SharedFormulaUtil
+{
+public:
+
+    /**
+     * Group formula cells stored in the passed container. The formula cells
+     * in the container are assumed to be all <b>non-shared</b>.
+     */
+    template<typename Iter>
+    static void groupFormulaCells(const Iter& itBeg, const Iter& itEnd)
+    {
+        Iter it = itBeg;
+        ScFormulaCell* pPrev = *it;
+        ScFormulaCell* pCur = nullptr;
+        for (++it; it != itEnd; ++it, pPrev = pCur)
+        {
+            pCur = *it;
+            ScFormulaCell::CompareState eState = pCur->CompareByTokenArray(*pPrev);
+            if (eState == ScFormulaCell::NotEqual)
+                continue;
+
+            ScFormulaCellGroupRef xGroup = pPrev->GetCellGroup();
+            if (xGroup)
+            {
+                // Extend the group.
+                ++xGroup->mnLength;
+                pCur->SetCellGroup(xGroup);
+                continue;
+            }
+
+            // Create a new group.
+            xGroup = pPrev->CreateCellGroup(2, eState == ScFormulaCell::EqualInvariant);
+            pCur->SetCellGroup(xGroup);
+        }
+    }
+
+    /** Get shared formula top cell from position, if any, else nullptr. */
+    static const ScFormulaCell* getSharedTopFormulaCell(const CellStoreType::position_type& aPos);
+
+    /**
+     * Split existing shared formula range at specified position. The cell at
+     * specified position becomes the top cell of the lower shared formula
+     * range after this call.  This method does nothing if the cell at
+     * specified position is not a formula cell.
+     *
+     * @param aPos position of cell to examine.
+     * @param pCxt context to be used, if any, may be nullptr.
+     *
+     * @return TRUE if there indeed was a split, else FALSE (e.g. split
+     *         position was top or bottom cell or no formula group).
+     */
+    static bool splitFormulaCellGroup(const CellStoreType::position_type& aPos, sc::EndListeningContext* pCxt);
+
+    /**
+     * Split existing shared formula ranges at specified row positions.
+     *
+     * @param rCells cell storage container
+     * @param rBounds row positions at which to split existing shared formula
+     *                ranges. Note that this method will directly modify this
+     *                parameter to sort and remove duplicates.
+     *
+     * @return TRUE if there indeed was a split, else FALSE (e.g. split
+     *         positions were only top or bottom cells or no formula group).
+     */
+    static bool splitFormulaCellGroups(const ScDocument* pDoc, CellStoreType& rCells, std::vector<SCROW>& rBounds);
+
+    /**
+     * See if two specified adjacent formula cells can be merged, and if they
+     * can, merge them into the same group.
+     *
+     * @param rPos position object of the first cell
+     * @param rCell1 first cell
+     * @param rCell2 second cell located immediately below the first cell.
+     *
+     * @return true if the cells are merged, false otherwise.  If the two
+     *         cells already belong to the same group, it returns false.
+     */
+    static bool joinFormulaCells(
+        const CellStoreType::position_type& rPos, ScFormulaCell& rCell1, ScFormulaCell& rCell2 );
+    /**
+     * Merge with an existing formula group (if any) located immediately above
+     * if the cell at specified position is a formula cell, and its formula
+     * tokens are identical to that of the above formula group.
+     *
+     * @param aPos position of cell to examine.
+     *
+     * @return true if the cells are merged, false otherwise.  If the two
+     *         cells already belong to the same group, it returns false.
+     */
+    static bool joinFormulaCellAbove( const CellStoreType::position_type& aPos );
+
+    /**
+     * Turn a shared formula cell into a non-shared one, and split it off from
+     * the adjacent formula cell groups.
+     *
+     * @param aPos position of cell to examine
+     * @param rCell formula cell instance
+     */
+    static void unshareFormulaCell(const CellStoreType::position_type& aPos, ScFormulaCell& rCell);
+
+    /**
+     * Make specified formula cells non-shared ones, and split them off from
+     * their respective adjacent formula cell groups.
+     *
+     * @param rCells cell storage container
+     * @param rRows row positions at which to unshare formula cells.
+     */
+    static void unshareFormulaCells(const ScDocument* pDoc, CellStoreType& rCells, std::vector<SCROW>& rRows);
+
+    /**
+     * Have all formula cells belonging to a group start listening to their
+     * references.
+     *
+     * @param rCxt context object.
+     * @param ppSharedTop memory position of the pointer of the topmost
+     *                    formula cell instance in the cell storage.  The
+     *                    caller is responsible for ensuring that it is indeed
+     *                    the topmost cell of a shared formula group.
+     */
+    static void startListeningAsGroup( StartListeningContext& rCxt, ScFormulaCell** ppSharedTop );
+};
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */