QGraphicsWidget was not working properly when ItemSendsPositionChanges is false

The geometry was not properly set because QGraphicsWidget rely on itemChange
to update its own geometry. Now when calling setPos we also ensure that
for a widget the geometry will be up to date. Setting the flag
ItemSendsPositionChanges to false for a given widget will give a small
performance boost.

Reviewed-by:janarve
Reviewed-by:bnilsen

4 files changed, 17 insertions, 7 deletions

diff --git a/src/gui/graphicsview/qgraphicsitem.cpp b/src/gui/graphicsview/qgraphicsitem.cpp
index 42abe59..074e571 100644
--- a/src/gui/graphicsview/qgraphicsitem.cpp
+++ b/src/gui/graphicsview/qgraphicsitem.cpp
@@ -3578,6 +3578,8 @@ void QGraphicsItem::setPos(const QPointF &pos)
     // Update and repositition.
     if (!(d_ptr->flags & ItemSendsGeometryChanges)) {
         d_ptr->setPosHelper(pos);
+        if (d_ptr->isWidget)
+            static_cast<QGraphicsWidget *>(this)->d_func()->setGeometryFromSetPos();
         return;
     }
 
diff --git a/src/gui/graphicsview/qgraphicswidget.cpp b/src/gui/graphicsview/qgraphicswidget.cpp
index 8b80bc8..3151e76 100644
--- a/src/gui/graphicsview/qgraphicswidget.cpp
+++ b/src/gui/graphicsview/qgraphicswidget.cpp
@@ -1044,13 +1044,7 @@ QVariant QGraphicsWidget::itemChange(GraphicsItemChange change, const QVariant &
         }
         break;
     case ItemPositionHasChanged:
-        if (!d->inSetGeometry) {
-            d->inSetPos = 1;
-            // Ensure setGeometry is called (avoid recursion when setPos is
-            // called from within setGeometry).
-            setGeometry(QRectF(pos(), size()));
-            d->inSetPos = 0 ;
-        }
+        d->setGeometryFromSetPos();
         break;
     case ItemParentChange: {
         QGraphicsItem *parent = qVariantValue<QGraphicsItem *>(value);
diff --git a/src/gui/graphicsview/qgraphicswidget_p.cpp b/src/gui/graphicsview/qgraphicswidget_p.cpp
index 1835c74..daa007f 100644
--- a/src/gui/graphicsview/qgraphicswidget_p.cpp
+++ b/src/gui/graphicsview/qgraphicswidget_p.cpp
@@ -825,6 +825,18 @@ void QGraphicsWidgetPrivate::setLayout_helper(QGraphicsLayout *l)
     }
 }
 
+void QGraphicsWidgetPrivate::setGeometryFromSetPos()
+{
+    if (inSetGeometry)
+        return;
+    Q_Q(QGraphicsWidget);
+    inSetPos = 1;
+    // Ensure setGeometry is called (avoid recursion when setPos is
+    // called from within setGeometry).
+    q->setGeometry(QRectF(pos, q->size()));
+    inSetPos = 0 ;
+}
+
 QT_END_NAMESPACE
 
 #endif //QT_NO_GRAPHICSVIEW
diff --git a/src/gui/graphicsview/qgraphicswidget_p.h b/src/gui/graphicsview/qgraphicswidget_p.h
index 2c5b3bf..140bc0e 100644
--- a/src/gui/graphicsview/qgraphicswidget_p.h
+++ b/src/gui/graphicsview/qgraphicswidget_p.h
@@ -130,6 +130,8 @@ public:
     void windowFrameHoverLeaveEvent(QGraphicsSceneHoverEvent *event);
     bool hasDecoration() const;
 
+    void setGeometryFromSetPos();
+
     // State
     inline int attributeToBitIndex(Qt::WidgetAttribute att) const
     {