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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the examples 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://www.qtsoftware.com/contact.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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);
+ }
+}
+