oox smartart import, composite alg: implement vertical centering

The bugdoc's case was that the total height would be used by 2 shapes,
but then a constraint decreases the height of one shape, so not all
vertical space is used.

We used to just count from the top, need to center vertically, as
PowerPoint does it.

(cherry picked from commit acdde3c643fde015214c546b1567727272ea799e)

Change-Id: I436019e9e837b73130e387c9bcd309e20045b0f9
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/95017
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/oox/source/drawingml/diagram/diagramlayoutatoms.cxx b/oox/source/drawingml/diagram/diagramlayoutatoms.cxx
index 33f858386999..19b1d10679f4 100644
--- a/oox/source/drawingml/diagram/diagramlayoutatoms.cxx
+++ b/oox/source/drawingml/diagram/diagramlayoutatoms.cxx
@@ -479,6 +479,11 @@ void AlgAtom::layoutShape( const ShapePtr& rShape,
             LayoutProperty& rParent = aProperties[""];
 
             sal_Int32 nParentXOffset = 0;
+
+            // Track min/max vertical positions, so we can center everything at the end, if needed.
+            sal_Int32 nVertMin = std::numeric_limits<sal_Int32>::max();
+            sal_Int32 nVertMax = 0;
+
             if (mfAspectRatio != 1.0)
             {
                 rParent[XML_w] = rShape->getSize().Width;
@@ -614,6 +619,24 @@ void AlgAtom::layoutShape( const ShapePtr& rShape,
                 aCurrShape->setSize(aSize);
                 aCurrShape->setChildSize(aSize);
                 aCurrShape->setPosition(aPos);
+
+                nVertMin = std::min(aPos.Y, nVertMin);
+                nVertMax = std::max(aPos.Y + aSize.Height, nVertMax);
+            }
+
+            // See if all vertical space is used or we have to center the content.
+            if (nVertMin >= 0 && nVertMax <= rParent[XML_h])
+            {
+                sal_Int32 nDiff = rParent[XML_h] - (nVertMax - nVertMin);
+                if (nDiff > 0)
+                {
+                    for (auto& aCurrShape : rShape->getChildren())
+                    {
+                        awt::Point aPosition = aCurrShape->getPosition();
+                        aPosition.Y += nDiff / 2;
+                        aCurrShape->setPosition(aPosition);
+                    }
+                }
             }
             break;
         }