2 files changed, 12 insertions, 4 deletions
diff --git a/src/corelib/kernel/qabstractitemmodel.cpp b/src/corelib/kernel/qabstractitemmodel.cpp
index fbeb59a5536..cbbb20a8c9f 100644
--- a/src/corelib/kernel/qabstractitemmodel.cpp
+++ b/src/corelib/kernel/qabstractitemmodel.cpp
@@ -1306,7 +1306,7 @@ void QAbstractItemModelPrivate::columnsRemoved(const QModelIndex &parent,
 */
 
 /*!
-    \fn void QAbstractItemModel::layoutAboutToBeChanged()
+    \fn void QAbstractItemModel::layoutAboutToBeChanged(const QList<QPersistentModelIndex> &parents = QList<QPersistentModelIndex>())
     \since 4.2
 
     This signal is emitted just before the layout of a model is changed.
@@ -1316,11 +1316,15 @@ void QAbstractItemModelPrivate::columnsRemoved(const QModelIndex &parent,
     Subclasses should update any persistent model indexes after emitting
     layoutAboutToBeChanged().
 
+    The optional @p parents parameter is used to give a more specific notification
+    about what parts of the layout of the model are changing. An empty list indicates
+    a change to the layout of the entire model.
+
     \sa layoutChanged(), changePersistentIndex()
 */
 
 /*!
-    \fn void QAbstractItemModel::layoutChanged()
+    \fn void QAbstractItemModel::layoutChanged(const QList<QPersistentModelIndex> &parents = QList<QPersistentModelIndex>())
 
     This signal is emitted whenever the layout of items exposed by the model
     has changed; for example, when the model has been sorted. When this signal
@@ -1332,6 +1336,10 @@ void QAbstractItemModelPrivate::columnsRemoved(const QModelIndex &parent,
     altering the structure of the data you expose to views, and emit
     layoutChanged() after changing the layout.
 
+    The optional @p parents parameter is used to give a more specific notification
+    about what parts of the layout of the model are changing. An empty list indicates
+    a change to the layout of the entire model.
+
     Subclasses should update any persistent model indexes before emitting
     layoutChanged(). In other words, when the structure changes:
 
diff --git a/src/corelib/kernel/qabstractitemmodel.h b/src/corelib/kernel/qabstractitemmodel.h
index 97c5b58482f..0aa81446021 100644
--- a/src/corelib/kernel/qabstractitemmodel.h
+++ b/src/corelib/kernel/qabstractitemmodel.h
@@ -233,8 +233,8 @@ public:
 Q_SIGNALS:
     void dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight, const QSet<int> &roles = QSet<int>());
     void headerDataChanged(Qt::Orientation orientation, int first, int last);
-    void layoutChanged();
-    void layoutAboutToBeChanged();
+    void layoutChanged(const QList<QPersistentModelIndex> &parents = QList<QPersistentModelIndex>());
+    void layoutAboutToBeChanged(const QList<QPersistentModelIndex> &parents = QList<QPersistentModelIndex>());
 
 #if !defined(Q_MOC_RUN) && !defined(qdoc)
 private: // can only be emitted by QAbstractItemModel