diff -r 000000000000 -r 1918ee327afb demos/browser/modelmenu.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/demos/browser/modelmenu.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,227 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the demonstration applications of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, 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 qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "modelmenu.h"
+
+#include <QtCore/QAbstractItemModel>
+#include <qdebug.h>
+
+ModelMenu::ModelMenu(QWidget * parent)
+    : QMenu(parent)
+    , m_maxRows(7)
+    , m_firstSeparator(-1)
+    , m_maxWidth(-1)
+    , m_hoverRole(0)
+    , m_separatorRole(0)
+    , m_model(0)
+{
+    connect(this, SIGNAL(aboutToShow()), this, SLOT(aboutToShow()));
+}
+
+bool ModelMenu::prePopulated()
+{
+    return false;
+}
+
+void ModelMenu::postPopulated()
+{
+}
+
+void ModelMenu::setModel(QAbstractItemModel *model)
+{
+    m_model = model;
+}
+
+QAbstractItemModel *ModelMenu::model() const
+{
+    return m_model;
+}
+
+void ModelMenu::setMaxRows(int max)
+{
+    m_maxRows = max;
+}
+
+int ModelMenu::maxRows() const
+{
+    return m_maxRows;
+}
+
+void ModelMenu::setFirstSeparator(int offset)
+{
+    m_firstSeparator = offset;
+}
+
+int ModelMenu::firstSeparator() const
+{
+    return m_firstSeparator;
+}
+
+void ModelMenu::setRootIndex(const QModelIndex &index)
+{
+    m_root = index;
+}
+
+QModelIndex ModelMenu::rootIndex() const
+{
+    return m_root;
+}
+
+void ModelMenu::setHoverRole(int role)
+{
+    m_hoverRole = role;
+}
+
+int ModelMenu::hoverRole() const
+{
+    return m_hoverRole;
+}
+
+void ModelMenu::setSeparatorRole(int role)
+{
+    m_separatorRole = role;
+}
+
+int ModelMenu::separatorRole() const
+{
+    return m_separatorRole;
+}
+
+Q_DECLARE_METATYPE(QModelIndex)
+void ModelMenu::aboutToShow()
+{
+    if (QMenu *menu = qobject_cast<QMenu*>(sender())) {
+        QVariant v = menu->menuAction()->data();
+        if (v.canConvert<QModelIndex>()) {
+            QModelIndex idx = qvariant_cast<QModelIndex>(v);
+            createMenu(idx, -1, menu, menu);
+            disconnect(menu, SIGNAL(aboutToShow()), this, SLOT(aboutToShow()));
+            return;
+        }
+    }
+
+    clear();
+    if (prePopulated())
+        addSeparator();
+    int max = m_maxRows;
+    if (max != -1)
+        max += m_firstSeparator;
+    createMenu(m_root, max, this, this);
+    postPopulated();
+}
+
+void ModelMenu::createMenu(const QModelIndex &parent, int max, QMenu *parentMenu, QMenu *menu)
+{
+    if (!menu) {
+        QString title = parent.data().toString();
+        menu = new QMenu(title, this);
+        QIcon icon = qvariant_cast<QIcon>(parent.data(Qt::DecorationRole));
+        menu->setIcon(icon);
+        parentMenu->addMenu(menu);
+        QVariant v;
+        v.setValue(parent);
+        menu->menuAction()->setData(v);
+        connect(menu, SIGNAL(aboutToShow()), this, SLOT(aboutToShow()));
+        return;
+    }
+
+    int end = m_model->rowCount(parent);
+    if (max != -1)
+        end = qMin(max, end);
+
+    connect(menu, SIGNAL(triggered(QAction*)), this, SLOT(triggered(QAction*)));
+    connect(menu, SIGNAL(hovered(QAction*)), this, SLOT(hovered(QAction*)));
+
+    for (int i = 0; i < end; ++i) {
+        QModelIndex idx = m_model->index(i, 0, parent);
+        if (m_model->hasChildren(idx)) {
+            createMenu(idx, -1, menu);
+        } else {
+            if (m_separatorRole != 0
+                && idx.data(m_separatorRole).toBool())
+                addSeparator();
+            else
+                menu->addAction(makeAction(idx));
+        }
+        if (menu == this && i == m_firstSeparator - 1)
+            addSeparator();
+    }
+}
+
+QAction *ModelMenu::makeAction(const QModelIndex &index)
+{
+    QIcon icon = qvariant_cast<QIcon>(index.data(Qt::DecorationRole));
+    QAction *action = makeAction(icon, index.data().toString(), this);
+    QVariant v;
+    v.setValue(index);
+    action->setData(v);
+    return action;
+}
+
+QAction *ModelMenu::makeAction(const QIcon &icon, const QString &text, QObject *parent)
+{
+    QFontMetrics fm(font());
+    if (-1 == m_maxWidth)
+        m_maxWidth = fm.width(QLatin1Char('m')) * 30;
+    QString smallText = fm.elidedText(text, Qt::ElideMiddle, m_maxWidth);
+    return new QAction(icon, smallText, parent);
+}
+
+void ModelMenu::triggered(QAction *action)
+{
+    QVariant v = action->data();
+    if (v.canConvert<QModelIndex>()) {
+        QModelIndex idx = qvariant_cast<QModelIndex>(v);
+        emit activated(idx);
+    }
+}
+
+void ModelMenu::hovered(QAction *action)
+{
+    QVariant v = action->data();
+    if (v.canConvert<QModelIndex>()) {
+        QModelIndex idx = qvariant_cast<QModelIndex>(v);
+        QString hoveredString = idx.data(m_hoverRole).toString();
+        if (!hoveredString.isEmpty())
+            emit hovered(hoveredString);
+    }
+}
+