New proxy model: QTransposeProxyModel

Implemented a new proxy model to transpose the source model.
Rows will become columns and vice-versa.
Both flat and tree models supported.

[ChangeLog][QtCore] New class QTransposeProxyModel to
swap rows and columns of the source model.

Change-Id: I902963c6b81aa0f63b5ad2bddca538f28b565084
Reviewed-by: David Faure <david.faure@kdab.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/corelib/itemmodels/qabstractitemmodel.h b/src/corelib/itemmodels/qabstractitemmodel.h
index bec71b0606..0aa75d6ff7 100644
--- a/src/corelib/itemmodels/qabstractitemmodel.h
+++ b/src/corelib/itemmodels/qabstractitemmodel.h
@@ -163,6 +163,7 @@ typedef QList<QModelIndex> QModelIndexList;
 
 class QMimeData;
 class QAbstractItemModelPrivate;
+class QTransposeProxyModelPrivate;
 template <class Key, class T> class QMap;
 
 
@@ -173,6 +174,7 @@ class Q_CORE_EXPORT QAbstractItemModel : public QObject
     friend class QPersistentModelIndexData;
     friend class QAbstractItemViewPrivate;
     friend class QIdentityProxyModel;
+    friend class QTransposeProxyModelPrivate;
 public:
 
     explicit QAbstractItemModel(QObject *parent = nullptr);