diff -r 000000000000 -r 16d8024aca5e src/hbwidgets/itemviews/hbtreeview_p.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hbwidgets/itemviews/hbtreeview_p.cpp	Mon Apr 19 14:02:13 2010 +0300
@@ -0,0 +1,109 @@
+/****************************************************************************
+**
+** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (developer.feedback@nokia.com)
+**
+** This file is part of the HbWidgets module of the UI Extensions for Mobile.
+**
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this file.
+** Please review the following information to ensure the GNU Lesser General
+** Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at developer.feedback@nokia.com.
+**
+****************************************************************************/
+    
+#include "hbtreeview_p.h"
+#include "hbtreeview.h"
+
+#include "hbtreeviewitem.h"
+#include "hbtreeitemselectionmodel_p.h"
+#include "hbtreemodeliterator_p.h"
+
+const QString KDefaultLayoutOption = "default";
+
+HbTreeViewPrivate::HbTreeViewPrivate() :
+    HbAbstractItemViewPrivate(),
+    mSelectionStarted(false)
+{
+}
+
+HbTreeViewPrivate::~HbTreeViewPrivate()
+{
+}
+
+void HbTreeViewPrivate::init()
+{
+    Q_Q(HbTreeView);
+
+    q->setClampingStyle(HbScrollArea::StrictClamping);
+    q->setFrictionEnabled(0);
+    q->setItemRecycling(true);
+    q->setScrollDirections(Qt::Horizontal | Qt::Vertical);
+    mLayoutOptionName = KDefaultLayoutOption;
+    treeModelIterator()->setItemContainer(mContainer, HbTreeViewItem::ExpansionKey);
+}
+
+bool HbTreeViewPrivate::isParentValid(const QModelIndex &parent) const
+{
+    bool valid = false;
+    QModelIndex currentParent = parent;
+    while (!valid) {
+        if (currentParent == mModelIterator->rootIndex()) {
+            valid = true;
+        } else if (currentParent.isValid()) {
+            currentParent = currentParent.parent();
+        } else {
+            break;
+        }
+    }
+    return valid;
+}
+
+bool HbTreeViewPrivate::isChild(const QModelIndex &index, const QModelIndex &parent) const
+{
+    bool isChild = false;
+    QModelIndex currentIndex = index;
+    while (!isChild) {
+        if (currentIndex.parent() == parent) {
+            isChild = true;
+        } else if (currentIndex.isValid()) {
+            currentIndex = currentIndex.parent();
+        } else {
+            break;
+        }
+    }
+    return isChild;
+}
+
+QModelIndex HbTreeViewPrivate::searchIndexUp( 
+                            const   QModelIndex &index,
+                            int     maxStepCount) const
+{
+    Q_Q(const HbTreeView);
+
+    QModelIndex root = q->rootIndex();
+    int counter = 1;
+
+    // previousIndex() returns invalid, if root found
+    QModelIndex previousIndex = index;
+    QModelIndex previousIndexTemp = mModelIterator->previousIndex(previousIndex);
+    while (previousIndex.isValid() && counter < maxStepCount) {
+        counter++;
+        previousIndexTemp = mModelIterator->previousIndex(previousIndex);
+        if (previousIndexTemp.isValid()) {
+            previousIndex = previousIndexTemp;
+        }
+    }
+    return previousIndex;
+}