/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the demonstration applications of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#include "modelmenu.h"+
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+
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#include <QtCore/QAbstractItemModel>+
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#include <qdebug.h>+
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+
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ModelMenu::ModelMenu(QWidget * parent)+
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    : QMenu(parent)+
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    , m_maxRows(7)+
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    , m_firstSeparator(-1)+
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    , m_maxWidth(-1)+
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    , m_hoverRole(0)+
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    , m_separatorRole(0)+
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    , m_model(0)+
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{+
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    connect(this, SIGNAL(aboutToShow()), this, SLOT(aboutToShow()));+
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}+
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+
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bool ModelMenu::prePopulated()+
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{+
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    return false;+
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}+
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+
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void ModelMenu::postPopulated()+
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{+
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}+
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+
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void ModelMenu::setModel(QAbstractItemModel *model)+
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{+
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    m_model = model;+
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}+
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+
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QAbstractItemModel *ModelMenu::model() const+
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{+
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    return m_model;+
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}+
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+
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void ModelMenu::setMaxRows(int max)+
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{+
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    m_maxRows = max;+
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}+
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+
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int ModelMenu::maxRows() const+
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{+
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    return m_maxRows;+
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}+
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+
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void ModelMenu::setFirstSeparator(int offset)+
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{+
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    m_firstSeparator = offset;+
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}+
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+
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int ModelMenu::firstSeparator() const+
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{+
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    return m_firstSeparator;+
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}+
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+
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void ModelMenu::setRootIndex(const QModelIndex &index)+
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{+
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    m_root = index;+
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}+
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+
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QModelIndex ModelMenu::rootIndex() const+
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{+
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    return m_root;+
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}+
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+
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void ModelMenu::setHoverRole(int role)+
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{+
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    m_hoverRole = role;+
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}+
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+
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int ModelMenu::hoverRole() const+
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{+
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    return m_hoverRole;+
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}+
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+
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void ModelMenu::setSeparatorRole(int role)+
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{+
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    m_separatorRole = role;+
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}+
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+
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int ModelMenu::separatorRole() const+
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{+
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    return m_separatorRole;+
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}+
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+
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Q_DECLARE_METATYPE(QModelIndex)+
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void ModelMenu::aboutToShow()+
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{+
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    if (QMenu *menu = qobject_cast<QMenu*>(sender())) {+
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        QVariant v = menu->menuAction()->data();+
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        if (v.canConvert<QModelIndex>()) {+
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            QModelIndex idx = qvariant_cast<QModelIndex>(v);+
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            createMenu(idx, -1, menu, menu);+
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            disconnect(menu, SIGNAL(aboutToShow()), this, SLOT(aboutToShow()));+
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            return;+
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        }+
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    }+
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+
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    clear();+
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    if (prePopulated())+
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        addSeparator();+
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    int max = m_maxRows;+
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    if (max != -1)+
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        max += m_firstSeparator;+
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    createMenu(m_root, max, this, this);+
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    postPopulated();+
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}+
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+
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void ModelMenu::createMenu(const QModelIndex &parent, int max, QMenu *parentMenu, QMenu *menu)+
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{+
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    if (!menu) {+
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        QString title = parent.data().toString();+
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        menu = new QMenu(title, this);+
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        QIcon icon = qvariant_cast<QIcon>(parent.data(Qt::DecorationRole));+
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        menu->setIcon(icon);+
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        parentMenu->addMenu(menu);+
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        QVariant v;+
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        v.setValue(parent);+
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        menu->menuAction()->setData(v);+
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        connect(menu, SIGNAL(aboutToShow()), this, SLOT(aboutToShow()));+
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        return;+
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    }+
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+
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    int end = m_model->rowCount(parent);+
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    if (max != -1)+
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        end = qMin(max, end);+
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+
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    connect(menu, SIGNAL(triggered(QAction*)), this, SLOT(triggered(QAction*)));+
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    connect(menu, SIGNAL(hovered(QAction*)), this, SLOT(hovered(QAction*)));+
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+
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    for (int i = 0; i < end; ++i) {+
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        QModelIndex idx = m_model->index(i, 0, parent);+
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        if (m_model->hasChildren(idx)) {+
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            createMenu(idx, -1, menu);+
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        } else {+
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            if (m_separatorRole != 0+
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                && idx.data(m_separatorRole).toBool())+
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                addSeparator();+
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            else+
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                menu->addAction(makeAction(idx));+
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        }+
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        if (menu == this && i == m_firstSeparator - 1)+
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            addSeparator();+
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    }+
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}+
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+
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QAction *ModelMenu::makeAction(const QModelIndex &index)+
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{+
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    QIcon icon = qvariant_cast<QIcon>(index.data(Qt::DecorationRole));+
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    QAction *action = makeAction(icon, index.data().toString(), this);+
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    QVariant v;+
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    v.setValue(index);+
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    action->setData(v);+
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    return action;+
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}+
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+
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QAction *ModelMenu::makeAction(const QIcon &icon, const QString &text, QObject *parent)+
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{+
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    QFontMetrics fm(font());+
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    if (-1 == m_maxWidth)+
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        m_maxWidth = fm.width(QLatin1Char('m')) * 30;+
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    QString smallText = fm.elidedText(text, Qt::ElideMiddle, m_maxWidth);+
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    return new QAction(icon, smallText, parent);+
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}+
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+
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void ModelMenu::triggered(QAction *action)+
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{+
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    QVariant v = action->data();+
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    if (v.canConvert<QModelIndex>()) {+
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        QModelIndex idx = qvariant_cast<QModelIndex>(v);+
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        emit activated(idx);+
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    }+
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}+
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+
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void ModelMenu::hovered(QAction *action)+
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{+
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    QVariant v = action->data();+
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    if (v.canConvert<QModelIndex>()) {+
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        QModelIndex idx = qvariant_cast<QModelIndex>(v);+
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        QString hoveredString = idx.data(m_hoverRole).toString();+
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        if (!hoveredString.isEmpty())+
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            emit hovered(hoveredString);+
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    }+
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}+
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+
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