Allow iteration over the Item.children property

QTBUG-9645

2 files changed, 22 insertions, 3 deletions

diff --git a/src/gui/graphicsview/qgraphicsitem.cpp b/src/gui/graphicsview/qgraphicsitem.cpp
index f106b3d..3245aec 100644
--- a/src/gui/graphicsview/qgraphicsitem.cpp
+++ b/src/gui/graphicsview/qgraphicsitem.cpp
@@ -7614,11 +7614,26 @@ void QGraphicsObject::updateMicroFocus()
     QGraphicsItem::updateMicroFocus();
 }
 
-void QGraphicsItemPrivate::append(QDeclarativeListProperty<QGraphicsObject> *list, QGraphicsObject *item)
+void QGraphicsItemPrivate::children_append(QDeclarativeListProperty<QGraphicsObject> *list, QGraphicsObject *item)
 {
     QGraphicsItemPrivate::get(item)->setParentItemHelper(static_cast<QGraphicsObject *>(list->object), /*newParentVariant=*/0, /*thisPointerVariant=*/0);
 }
 
+int QGraphicsItemPrivate::children_count(QDeclarativeListProperty<QGraphicsObject> *list)
+{
+    QGraphicsItemPrivate *d = QGraphicsItemPrivate::get(static_cast<QGraphicsObject *>(list->object));
+    return d->children.count();
+}
+
+QGraphicsObject *QGraphicsItemPrivate::children_at(QDeclarativeListProperty<QGraphicsObject> *list, int index)
+{
+    QGraphicsItemPrivate *d = QGraphicsItemPrivate::get(static_cast<QGraphicsObject *>(list->object));
+    if (index >= 0 && index < d->children.count()) 
+        return d->children.at(index)->toGraphicsObject();
+    else 
+        return 0;
+}
+
 /*!
     Returns a list of this item's children.
 
@@ -7631,7 +7646,8 @@ QDeclarativeListProperty<QGraphicsObject> QGraphicsItemPrivate::childrenList()
     Q_Q(QGraphicsItem);
     if (isObject) {
         QGraphicsObject *that = static_cast<QGraphicsObject *>(q);
-        return QDeclarativeListProperty<QGraphicsObject>(that, &children, QGraphicsItemPrivate::append);
+        return QDeclarativeListProperty<QGraphicsObject>(that, &children, children_append,
+                                                         children_count, children_at);
     } else {
         //QGraphicsItem is not supported for this property
         return QDeclarativeListProperty<QGraphicsObject>();
diff --git a/src/gui/graphicsview/qgraphicsitem_p.h b/src/gui/graphicsview/qgraphicsitem_p.h
index 73b8f04..922581d 100644
--- a/src/gui/graphicsview/qgraphicsitem_p.h
+++ b/src/gui/graphicsview/qgraphicsitem_p.h
@@ -480,9 +480,12 @@ public:
     void resetFocusProxy();
     virtual void subFocusItemChange();
 
+    static void children_append(QDeclarativeListProperty<QGraphicsObject> *list, QGraphicsObject *item);
+    static int children_count(QDeclarativeListProperty<QGraphicsObject> *list);
+    static QGraphicsObject *children_at(QDeclarativeListProperty<QGraphicsObject> *list, int);
+
     inline QTransform transformToParent() const;
     inline void ensureSortedChildren();
-    static void append(QDeclarativeListProperty<QGraphicsObject> *list, QGraphicsObject *item);
     static inline bool insertionOrder(QGraphicsItem *a, QGraphicsItem *b);
     void ensureSequentialSiblingIndex();
     inline void sendScenePosChange();