Optimize QGW constructor.

Mostly by avoiding sending useless QVariant at construction time.
itemChange is virtual, the user implementation will never be called.
Worst case the QGW one.

Reviewed-by:janarve

3 files changed, 10 insertions, 9 deletions

diff --git a/src/gui/graphicsview/qgraphicsitem.cpp b/src/gui/graphicsview/qgraphicsitem.cpp
index ba674dd..b2bdc5c 100644
--- a/src/gui/graphicsview/qgraphicsitem.cpp
+++ b/src/gui/graphicsview/qgraphicsitem.cpp
@@ -1090,6 +1090,10 @@ void QGraphicsItemPrivate::setParentItemHelper(QGraphicsItem *newParent, const Q
     if (newParent == parent)
         return;
 
+    if (isWidget)
+        static_cast<QGraphicsWidgetPrivate *>(this)->fixFocusChainBeforeReparenting((newParent &&
+                                                        newParent->isWidget()) ? static_cast<QGraphicsWidget *>(newParent) : 0,
+                                                        scene);
     if (scene) {
         // Deliver the change to the index
         if (scene->d_func()->indexMethod != QGraphicsScene::NoIndex)
@@ -1796,9 +1800,6 @@ static void _q_qgraphicsItemSetFlag(QGraphicsItem *item, QGraphicsItem::Graphics
 */
 void QGraphicsItem::setFlags(GraphicsItemFlags flags)
 {
-    if (isWindow())
-        flags |= ItemIsPanel;
-
     // Notify change and check for adjustment.
     if (quint32(d_ptr->flags) == quint32(flags))
         return;
diff --git a/src/gui/graphicsview/qgraphicswidget.cpp b/src/gui/graphicsview/qgraphicswidget.cpp
index b264447..478c0c3 100644
--- a/src/gui/graphicsview/qgraphicswidget.cpp
+++ b/src/gui/graphicsview/qgraphicswidget.cpp
@@ -1105,9 +1105,6 @@ QVariant QGraphicsWidget::itemChange(GraphicsItemChange change, const QVariant &
         }
         break;
     case ItemParentChange: {
-        QGraphicsItem *parent = qVariantValue<QGraphicsItem *>(value);
-        d->fixFocusChainBeforeReparenting((parent && parent->isWidget()) ? static_cast<QGraphicsWidget *>(parent) : 0, scene());
-
         // Deliver ParentAboutToChange.
         QEvent event(QEvent::ParentAboutToChange);
         QApplication::sendEvent(this, &event);
diff --git a/src/gui/graphicsview/qgraphicswidget_p.cpp b/src/gui/graphicsview/qgraphicswidget_p.cpp
index 6e397b6..50b315a 100644
--- a/src/gui/graphicsview/qgraphicswidget_p.cpp
+++ b/src/gui/graphicsview/qgraphicswidget_p.cpp
@@ -71,14 +71,17 @@ void QGraphicsWidgetPrivate::init(QGraphicsItem *parentItem, Qt::WindowFlags wFl
     adjustWindowFlags(&wFlags);
     windowFlags = wFlags;
 
-    q->setParentItem(parentItem);
+    if (parentItem)
+        setParentItemHelper(parentItem, 0, 0);
+
     q->setSizePolicy(QSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred, QSizePolicy::DefaultType));
     q->setGraphicsItem(q);
 
     resolveLayoutDirection();
     q->unsetWindowFrameMargins();
-    q->setFlag(QGraphicsItem::ItemUsesExtendedStyleOption);
-    q->setFlag(QGraphicsItem::ItemSendsGeometryChanges);
+    flags |= QGraphicsItem::ItemUsesExtendedStyleOption | QGraphicsItem::ItemSendsGeometryChanges;
+    if (windowFlags & Qt::Window)
+        flags |= QGraphicsItem::ItemIsPanel;
 }
 
 qreal QGraphicsWidgetPrivate::titleBarHeight(const QStyleOptionTitleBar &options) const