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, 73 insertions, 0 deletions

diff --git a/src/corelib/itemmodels/qtransposeproxymodel_p.h b/src/corelib/itemmodels/qtransposeproxymodel_p.h
new file mode 100644
index 0000000000..240fc4ccae
--- /dev/null
+++ b/src/corelib/itemmodels/qtransposeproxymodel_p.h
@@ -0,0 +1,73 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 Luca Beldi <v.ronin@yahoo.it>
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QTRANSPOSEPROXYMODEL_P_H
+#define QTRANSPOSEPROXYMODEL_P_H
+
+#include "qtransposeproxymodel.h"
+#include <private/qabstractproxymodel_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class QTransposeProxyModelPrivate : public QAbstractProxyModelPrivate
+{
+    Q_DECLARE_PUBLIC(QTransposeProxyModel)
+    Q_DISABLE_COPY(QTransposeProxyModelPrivate)
+private:
+    QTransposeProxyModelPrivate() = default;
+    QVector<QMetaObject::Connection> sourceConnections;
+    QVector<QPersistentModelIndex> layoutChangePersistentIndexes;
+    QModelIndexList layoutChangeProxyIndexes;
+    QModelIndex uncheckedMapToSource(const QModelIndex &proxyIndex) const;
+    QModelIndex uncheckedMapFromSource(const QModelIndex &sourceIndex) const;
+    void onLayoutChanged(const QList<QPersistentModelIndex> &parents, QAbstractItemModel::LayoutChangeHint hint);
+    void onLayoutAboutToBeChanged(const QList<QPersistentModelIndex> &parents, QAbstractItemModel::LayoutChangeHint hint);
+    void onDataChanged(const QModelIndex& topLeft, const QModelIndex& bottomRight, const QVector<int>& roles);
+    void onHeaderDataChanged(Qt::Orientation orientation, int first, int last);
+    void onColumnsAboutToBeInserted(const QModelIndex &parent, int first, int last);
+    void onColumnsAboutToBeRemoved(const QModelIndex &parent, int first, int last);
+    void onColumnsAboutToBeMoved(const QModelIndex &sourceParent, int sourceStart, int sourceEnd, const QModelIndex &destinationParent, int destinationColumn);
+    void onRowsAboutToBeInserted(const QModelIndex &parent, int first, int last);
+    void onRowsAboutToBeRemoved(const QModelIndex &parent, int first, int last);
+    void onRowsAboutToBeMoved(const QModelIndex &sourceParent, int sourceStart, int sourceEnd, const QModelIndex &destinationParent, int destinationRow);
+};
+
+QT_END_NAMESPACE
+
+#endif //QTRANSPOSEPROXYMODEL_P_H