oox smartart, accent process: add support for zorder offsets

The oox::drawingml::Shape -> css::drawing::XShape converter doesn't
support ZOrder, so just give each drawingml::Shape a default ZOrder.
This way the offsets can be applied, and sorting can move the shapes to
their correct place.

This makes parent text of the bugdoc readable.

Change-Id: Ib87a096fba66aad4a4f35d19473ea88dab340fd0
Reviewed-on: https://gerrit.libreoffice.org/63478
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Tested-by: Jenkins

3 files changed, 36 insertions, 0 deletions

diff --git a/oox/source/drawingml/diagram/layoutatomvisitors.cxx b/oox/source/drawingml/diagram/layoutatomvisitors.cxx
index b85b5228407d..700b48080bc6 100644
--- a/oox/source/drawingml/diagram/layoutatomvisitors.cxx
+++ b/oox/source/drawingml/diagram/layoutatomvisitors.cxx
@@ -168,6 +168,38 @@ void ShapeCreationVisitor::visit(LayoutNode& rAtom)
         std::remove_if(pCurrParent->getChildren().begin(), pCurrParent->getChildren().end(),
             [] (const ShapePtr & aChild) { return aChild->getServiceName() == "com.sun.star.drawing.GroupShape" && aChild->getChildren().empty(); }),
         pCurrParent->getChildren().end());
+
+    // Offset the children from their default z-order stacking, if necessary.
+    std::vector<ShapePtr>& rChildren = pCurrParent->getChildren();
+    for (size_t i = 0; i < rChildren.size(); ++i)
+        rChildren[i]->setZOrder(i);
+
+    for (size_t i = 0; i < rChildren.size(); ++i)
+    {
+        const ShapePtr& pChild = rChildren[i];
+        sal_Int32 nZOrderOff = pChild->getZOrderOff();
+        if (nZOrderOff <= 0)
+            continue;
+
+        // Increase my ZOrder by nZOrderOff.
+        pChild->setZOrder(pChild->getZOrder() + nZOrderOff);
+        pChild->setZOrderOff(0);
+
+        for (sal_Int32 j = 0; j < nZOrderOff; ++j)
+        {
+            size_t nIndex = i + j + 1;
+            if (nIndex >= rChildren.size())
+                break;
+
+            // Decrease the ZOrder of the next nZOrderOff elements by one.
+            const ShapePtr& pNext = rChildren[nIndex];
+            pNext->setZOrder(pNext->getZOrder() - 1);
+        }
+    }
+
+    // Now that the ZOrders are adjusted, sort the children.
+    std::sort(rChildren.begin(), rChildren.end(),
+              [](const ShapePtr& a, const ShapePtr& b) { return a->getZOrder() < b->getZOrder(); });
 }
 
 void ShapeCreationVisitor::visit(ShapeAtom& /*rAtom*/)
diff --git a/oox/source/drawingml/diagram/layoutnodecontext.cxx b/oox/source/drawingml/diagram/layoutnodecontext.cxx
index d81cbdf74ae0..2cfeec2e8db6 100644
--- a/oox/source/drawingml/diagram/layoutnodecontext.cxx
+++ b/oox/source/drawingml/diagram/layoutnodecontext.cxx
@@ -210,6 +210,8 @@ LayoutNodeContext::onCreateContext( ::sal_Int32 aElement,
 
         pShape->setDiagramRotation(rAttribs.getInteger(XML_rot, 0) * PER_DEGREE);
 
+        pShape->setZOrderOff(rAttribs.getInteger(XML_zOrderOff, 0));
+
         ShapeAtomPtr pAtom( new ShapeAtom(mpNode->getLayoutNode(), pShape) );
         LayoutAtom::connect(mpNode, pAtom);
         return new ShapeContext( *this, ShapePtr(), pShape );
diff --git a/oox/source/drawingml/shape.cxx b/oox/source/drawingml/shape.cxx
index 1d1e4d8be5a1..2c3348fcf159 100644
--- a/oox/source/drawingml/shape.cxx
+++ b/oox/source/drawingml/shape.cxx
@@ -175,6 +175,8 @@ Shape::Shape( const ShapePtr& pSourceShape )
 , maLinkedTxbxAttr()
 , mbHasLinkedTxbx(false)
 , maDiagramDoms( pSourceShape->maDiagramDoms )
+, mnZOrder(pSourceShape->mnZOrder)
+, mnZOrderOff(pSourceShape->mnZOrderOff)
 {}
 
 Shape::~Shape()