QGAL: allow parallel anchors simplify center anchors

This commit make possible to parallelize anchors that are center
anchors, i.e. that have extra constraints (stored in
itemCenterConstraints).

This is trivial to support since the parallel anchor will have the same
size as its children, so it can just "take the place" of its children in
the constraints. Restore function was added as well.

To manipulate internal structures, relevant static functions were
promoted to methods.

Signed-off-by: Caio Marcelo de Oliveira Filho <caio.oliveira@openbossa.org>
Reviewed-by: Eduardo M. Fleury <eduardo.fleury@openbossa.org>

1 files changed, 14 insertions, 4 deletions

diff --git a/src/gui/graphicsview/qgraphicsanchorlayout_p.h b/src/gui/graphicsview/qgraphicsanchorlayout_p.h
index d8e62b4..d7b3cfd 100644
--- a/src/gui/graphicsview/qgraphicsanchorlayout_p.h
+++ b/src/gui/graphicsview/qgraphicsanchorlayout_p.h
@@ -275,6 +275,9 @@ struct ParallelAnchorData : public AnchorData
 
     AnchorData* firstEdge;
     AnchorData* secondEdge;
+
+    QList<QSimplexConstraint *> m_firstConstraints;
+    QList<QSimplexConstraint *> m_secondConstraints;
 };
 
 /*!
@@ -433,20 +436,27 @@ public:
 
     QLayoutStyleInfo &styleInfo() const;
 
-    // Activation methods
-    bool simplifyGraph(Orientation orientation);
-    bool simplifyGraphIteration(Orientation orientation, bool *feasible);
-    void restoreSimplifiedGraph(Orientation orientation);
+    AnchorData *addAnchorMaybeParallel(AnchorData *newAnchor, bool *feasible);
 
+    // Activation
     void calculateGraphs();
     void calculateGraphs(Orientation orientation);
 
+    // Simplification
+    bool simplifyGraph(Orientation orientation);
+    bool simplifyGraphIteration(Orientation orientation, bool *feasible);
+
+    void restoreSimplifiedGraph(Orientation orientation);
+    void restoreSimplifiedAnchor(AnchorData *edge);
+    void restoreSimplifiedConstraints(ParallelAnchorData *parallel);
+
     bool calculateTrunk(Orientation orientation, const GraphPath &trunkPath,
                         const QList<QSimplexConstraint *> &constraints,
                         const QList<AnchorData *> &variables);
     bool calculateNonTrunk(const QList<QSimplexConstraint *> &constraints,
                            const QList<AnchorData *> &variables);
 
+    // Support functions for calculateGraph()
     bool refreshAllSizeHints(Orientation orientation);
     void findPaths(Orientation orientation);
     void constraintsFromPaths(Orientation orientation);