tdf#99452 svx: fix undo of table row edge drag

The problem as seen by the user: if you have a table of 2 rows and 1 column,
and the separator line is dragged upwards by the mouse, then undo doesn't
restore the original situation.

Two items are created on the undo stack: sd::UndoGeoObject and
sdr::table::TableRowUndo. Let's say the table height is 8000 mm100 and the two
cell heights are 4000 and 4000. If the user resizes the first cell, so that its
height is 2000, then the new table height will be 6000. The problem is that
when undo is executed, first sd::UndoGeoObject resizes the table, distributing
the newly available 2000 between the existing rows, and then
sdr::table::TableRowUndo sets the row height of the first row: the height of
the second cell will be larger than expected. Fix the problem by not doing a
relayout during sd::UndoGeoObject, but doing a relayout after
sdr::table::TableRowUndo in this case.

This is done by:

1) Adding a new SdrDragStat::mbEndDragChangesLayout, so that
SdrTableObj::applySpecialDrag() can inform SdrDragObjOwn::EndSdrDrag() that
TableRowUndo will do the layout instead of UndoGeoObject. (This is done only in
case a row edge is dragged, as otherwise it's not guaranteed that a
TableRowUndo will follow the UndoGeoObject on the undo stack.)

2) Adding a new SdrUndoGeoObj::mbSkipChangeLayout, so that
SdrTableObj::applySpecialDrag() can let SdrUndoGeoObj::Undo() not do the
layout.

3) Adding a sdr::table::SdrTableObjImpl::mbSkipChangeLayout, so that
SdrUndoGeoObj::Undo() can let SdrTableObj::NbcSetLogicRect() not do the layout.

4) Marking the table model as modified in TableRowUndo::setData(), so it does
the layout at the end of the undo group.

Change-Id: I8adde3cdad5741e6fcb420e333ce336e18c77cf1
Reviewed-on: https://gerrit.libreoffice.org/24363
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>

7 files changed, 36 insertions, 1 deletions

diff --git a/svx/source/svdraw/svddrag.cxx b/svx/source/svdraw/svddrag.cxx
index 8eb54cbef3d8..75c046a1326b 100644
--- a/svx/source/svdraw/svddrag.cxx
+++ b/svx/source/svdraw/svddrag.cxx
@@ -50,6 +50,7 @@ void SdrDragStat::Reset()
     pDragMethod=nullptr;
     bEndDragChangesAttributes=false;
     bEndDragChangesGeoAndAttributes=false;
+    mbEndDragChangesLayout=false;
     bMouseIsUp=false;
     Clear(true);
     aActionRect=Rectangle();
diff --git a/svx/source/svdraw/svddrgmt.cxx b/svx/source/svdraw/svddrgmt.cxx
index 09ca6cba9b1a..5996b50eaecd 100644
--- a/svx/source/svdraw/svddrgmt.cxx
+++ b/svx/source/svdraw/svddrgmt.cxx
@@ -1410,6 +1410,12 @@ bool SdrDragObjOwn::EndSdrDrag(bool /*bCopy*/)
         }
 
         bRet = pObj->applySpecialDrag(DragStat());
+        if (DragStat().IsEndDragChangesLayout())
+        {
+            auto pGeoUndo = dynamic_cast<SdrUndoGeoObj*>(pUndo);
+            if (pGeoUndo)
+                pGeoUndo->SetSkipChangeLayout(true);
+        }
 
         if(bRet)
         {
diff --git a/svx/source/svdraw/svdundo.cxx b/svx/source/svdraw/svdundo.cxx
index 37e81e7cdffe..e3cc47895528 100644
--- a/svx/source/svdraw/svdundo.cxx
+++ b/svx/source/svdraw/svdundo.cxx
@@ -598,6 +598,7 @@ SdrUndoGeoObj::SdrUndoGeoObj(SdrObject& rNewObj)
      , pUndoGeo(nullptr)
      , pRedoGeo(nullptr)
      , pUndoGroup(nullptr)
+     , mbSkipChangeLayout(false)
 {
     SdrObjList* pOL=rNewObj.GetSubList();
     if (pOL!=nullptr && pOL->GetObjCount() && dynamic_cast<const E3dScene* >( &rNewObj) ==  nullptr)
@@ -640,7 +641,13 @@ void SdrUndoGeoObj::Undo()
     {
         delete pRedoGeo;
         pRedoGeo=pObj->GetGeoData();
+
+        auto pTableObj = dynamic_cast<sdr::table::SdrTableObj*>(pObj);
+        if (pTableObj && mbSkipChangeLayout)
+            pTableObj->SetSkipChangeLayout(true);
         pObj->SetGeoData(*pUndoGeo);
+        if (pTableObj && mbSkipChangeLayout && pTableObj)
+            pTableObj->SetSkipChangeLayout(false);
     }
 }
 
diff --git a/svx/source/table/svdotable.cxx b/svx/source/table/svdotable.cxx
index 4121fdaf3d6c..9d13f8fca6b3 100644
--- a/svx/source/table/svdotable.cxx
+++ b/svx/source/table/svdotable.cxx
@@ -204,6 +204,7 @@ public:
     TableStyleSettings maTableStyle;
     Reference< XIndexAccess > mxTableStyle;
     std::vector<std::unique_ptr<SdrUndoAction>> maUndos;
+    bool mbSkipChangeLayout;
 
     void SetModel(SdrModel* pOldModel, SdrModel* pNewModel);
 
@@ -260,6 +261,7 @@ sal_Int32 SdrTableObjImpl::lastColCount;
 SdrTableObjImpl::SdrTableObjImpl()
 : mpTableObj( nullptr )
 , mpLayouter( nullptr )
+, mbSkipChangeLayout(false)
 {
 }
 
@@ -1868,7 +1870,11 @@ void SdrTableObj::NbcSetLogicRect(const Rectangle& rRect)
     const bool bWidth = maLogicRect.getWidth() != maRect.getWidth();
     const bool bHeight = maLogicRect.getHeight() != maRect.getHeight();
     maRect = maLogicRect;
-    NbcAdjustTextFrameWidthAndHeight( !bHeight, !bWidth );
+    if (mpImpl->mbSkipChangeLayout)
+        // Avoid distributing newly available space between existing cells.
+        NbcAdjustTextFrameWidthAndHeight(true, true);
+    else
+        NbcAdjustTextFrameWidthAndHeight(!bHeight, !bWidth);
     SetRectsDirty();
 }
 
@@ -2005,6 +2011,11 @@ void SdrTableObj::AddUndo(SdrUndoAction* pUndo)
     mpImpl->maUndos.push_back(std::unique_ptr<SdrUndoAction>(pUndo));
 }
 
+void SdrTableObj::SetSkipChangeLayout(bool bSkipChangeLayout)
+{
+    mpImpl->mbSkipChangeLayout = bSkipChangeLayout;
+}
+
 // gets base transformation and rectangle of object. If it's an SdrPathObj it fills the PolyPolygon
 // with the base geometry and returns TRUE. Otherwise it returns FALSE.
 bool SdrTableObj::TRGetBaseGeometry(basegfx::B2DHomMatrix& rMatrix, basegfx::B2DPolyPolygon& rPolyPolygon ) const
@@ -2247,6 +2258,7 @@ bool SdrTableObj::applySpecialDrag(SdrDragStat& rDrag)
                 if( GetModel() && IsInserted() )
                 {
                     rDrag.SetEndDragChangesAttributes(true);
+                    rDrag.SetEndDragChangesLayout(true);
                 }
 
                 mpImpl->DragEdge( pEdgeHdl->IsHorizontalEdge(), pEdgeHdl->GetPointNum(), pEdgeHdl->GetValidDragOffset( rDrag ) );
diff --git a/svx/source/table/tablerow.cxx b/svx/source/table/tablerow.cxx
index ee95e905554b..cd82cc423b45 100644
--- a/svx/source/table/tablerow.cxx
+++ b/svx/source/table/tablerow.cxx
@@ -149,6 +149,10 @@ void TableRow::removeColumns( sal_Int32 nIndex, sal_Int32 nCount )
     }
 }
 
+TableModelRef TableRow::getModel() const
+{
+    return mxTableModel;
+}
 
 // XCellRange
 
diff --git a/svx/source/table/tablerow.hxx b/svx/source/table/tablerow.hxx
index 77d654f23297..6b38b8037389 100644
--- a/svx/source/table/tablerow.hxx
+++ b/svx/source/table/tablerow.hxx
@@ -47,6 +47,8 @@ public:
 
     void insertColumns( sal_Int32 nIndex, sal_Int32 nCount, CellVector::iterator* pIter = nullptr );
     void removeColumns( sal_Int32 nIndex, sal_Int32 nCount );
+    /// Reference to the table model containing this row.
+    TableModelRef getModel() const;
 
     // XCellRange
     virtual css::uno::Reference< css::table::XCell > SAL_CALL getCellByPosition( sal_Int32 nColumn, sal_Int32 nRow ) throw (css::lang::IndexOutOfBoundsException, css::uno::RuntimeException, std::exception) override;
diff --git a/svx/source/table/tableundo.cxx b/svx/source/table/tableundo.cxx
index baa7e6c29456..3a60ab02d0c2 100644
--- a/svx/source/table/tableundo.cxx
+++ b/svx/source/table/tableundo.cxx
@@ -463,6 +463,9 @@ void TableRowUndo::setData( const Data& rData )
     mxRow->mbIsVisible = rData.mbIsVisible;
     mxRow->mbIsStartOfNewPage = rData.mbIsStartOfNewPage;
     mxRow->maName = rData.maName;
+
+    // Trigger re-layout of the table.
+    mxRow->getModel()->setModified(true);
  }