QGraphicsAnchorLayout: Adding updateChildrenSizes method to anchors

This method is meant to be called by the AnchorLayout after it has
set the sizes of all root anchors of a simplified graph.

The idea here it that these anchors will then propagate its new
sizes down the simplification tree.

Signed-off-by: Eduardo M. Fleury <eduardo.fleury@openbossa.org>
Reviewed-by: Jan-Arve Sæther <jan-arve.saether@nokia.com>

2 files changed, 31 insertions, 0 deletions

diff --git a/src/gui/graphicsview/qgraphicsanchorlayout_p.cpp b/src/gui/graphicsview/qgraphicsanchorlayout_p.cpp
index afe60a1..4844748 100644
--- a/src/gui/graphicsview/qgraphicsanchorlayout_p.cpp
+++ b/src/gui/graphicsview/qgraphicsanchorlayout_p.cpp
@@ -45,6 +45,30 @@
 
 #include "qgraphicsanchorlayout_p.h"
 
+void ParallelAnchorData::updateChildrenSizes()
+{
+    firstEdge->sizeAtMinimum = secondEdge->sizeAtMinimum = sizeAtMinimum;
+    firstEdge->sizeAtPreferred = secondEdge->sizeAtPreferred = sizeAtPreferred;
+    firstEdge->sizeAtMaximum = secondEdge->sizeAtMaximum = sizeAtMaximum;
+
+    firstEdge->updateChildrenSizes();
+    secondEdge->updateChildrenSizes();
+}
+
+void SequentialAnchorData::updateChildrenSizes()
+{
+    qreal minFactor = sizeAtMinimum / minSize;
+    qreal prefFactor = sizeAtPreferred / prefSize;
+    qreal maxFactor = sizeAtMaximum / maxSize;
+
+    for (int i = 0; i < m_edges.count(); ++i) {
+        m_edges[i]->sizeAtMinimum = m_edges[i]->minSize * minFactor;
+        m_edges[i]->sizeAtPreferred = m_edges[i]->prefSize * prefFactor;
+        m_edges[i]->sizeAtMaximum = m_edges[i]->maxSize * maxFactor;
+        m_edges[i]->updateChildrenSizes();
+    }
+}
+
 QSimplexConstraint *GraphPath::constraint(const GraphPath &path) const
 {
     // Calculate
diff --git a/src/gui/graphicsview/qgraphicsanchorlayout_p.h b/src/gui/graphicsview/qgraphicsanchorlayout_p.h
index 2f1aa97..1c0f737 100644
--- a/src/gui/graphicsview/qgraphicsanchorlayout_p.h
+++ b/src/gui/graphicsview/qgraphicsanchorlayout_p.h
@@ -145,6 +145,8 @@ struct AnchorData : public QSimplexVariable {
           sizeAtMinimum(0), sizeAtPreferred(0), sizeAtMaximum(0),
           skipInPreferred(0), type(Normal), hasSize(false) {}
 
+    virtual void updateChildrenSizes() { };
+
     inline QString toString() const;
     QString name;
 
@@ -192,6 +194,8 @@ struct SequentialAnchorData : public AnchorData
         name = QLatin1String("SequentialAnchorData");
     }
 
+    virtual void updateChildrenSizes();
+
     void setVertices(const QVector<AnchorVertex*> &vertices)
     {
         m_children = vertices;
@@ -212,6 +216,9 @@ struct ParallelAnchorData : public AnchorData
         origin = first->origin;
         name = QString::fromAscii("%1 | %2").arg(first->toString(), second->toString());
     }
+
+    virtual void updateChildrenSizes();
+
     AnchorData* firstEdge;
     AnchorData* secondEdge;
 };