path: root/src/gui/itemviews/qabstractproxymodel.cpp

/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui module 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 "qabstractproxymodel.h"

#ifndef QT_NO_PROXYMODEL

#include "qitemselectionmodel.h"
#include <private/qabstractproxymodel_p.h>

QT_BEGIN_NAMESPACE

/*!
    \since 4.1
    \class QAbstractProxyModel
    \brief The QAbstractProxyModel class provides a base class for proxy item
    models that can do sorting, filtering or other data processing tasks.
    \ingroup model-view

    This class defines the standard interface that proxy models must use to be
    able to interoperate correctly with other model/view components. It is not
    supposed to be instantiated directly.

    All standard proxy models are derived from the QAbstractProxyModel class.
    If you need to create a new proxy model class, it is usually better to
    subclass an existing class that provides the closest behavior to the one
    you want to provide.

    Proxy models that filter or sort items of data from a source model should
    be created by using or subclassing QSortFilterProxyModel.

    To subclass QAbstractProxyModel, you need to implement mapFromSource() and
    mapToSource(). The mapSelectionFromSource() and mapSelectionToSource()
    functions only need to be reimplemented if you need a behavior different
    from the default behavior.

    \note If the source model is deleted or no source model is specified, the
    proxy model operates on a empty placeholder model.

    \sa QSortFilterProxyModel, QAbstractItemModel, {Model/View Programming}
*/

//detects the deletion of the source model
void QAbstractProxyModelPrivate::_q_sourceModelDestroyed()
{
    model = QAbstractItemModelPrivate::staticEmptyModel();
}

/*!
    Constructs a proxy model with the given \a parent.
*/

QAbstractProxyModel::QAbstractProxyModel(QObject *parent)
    :QAbstractItemModel(*new QAbstractProxyModelPrivate, parent)
{
    setSourceModel(QAbstractItemModelPrivate::staticEmptyModel());
}

/*!
    \internal
*/

QAbstractProxyModel::QAbstractProxyModel(QAbstractProxyModelPrivate &dd, QObject *parent)
    : QAbstractItemModel(dd, parent)
{
    setSourceModel(QAbstractItemModelPrivate::staticEmptyModel());
}

/*!
    Destroys the proxy model.
*/
QAbstractProxyModel::~QAbstractProxyModel()
{

}

/*!
    Sets the given \a sourceModel to be processed by the proxy model.
*/
void QAbstractProxyModel::setSourceModel(QAbstractItemModel *sourceModel)
{
    Q_D(QAbstractProxyModel);
    if (d->model)
        disconnect(d->model, SIGNAL(destroyed()), this, SLOT(_q_sourceModelDestroyed()));

    if (sourceModel) {
        d->model = sourceModel;
        connect(d->model, SIGNAL(destroyed()), this, SLOT(_q_sourceModelDestroyed()));
    } else {
        d->model = QAbstractItemModelPrivate::staticEmptyModel();
    }
}

/*!
    Returns the model that contains the data that is available through the proxy model.
*/
QAbstractItemModel *QAbstractProxyModel::sourceModel() const
{
    Q_D(const QAbstractProxyModel);
    if (d->model == QAbstractItemModelPrivate::staticEmptyModel())
        return 0;
    return d->model;
}

/*!
    \reimp
 */
bool QAbstractProxyModel::submit()
{
    Q_D(QAbstractProxyModel);
    return d->model->submit();
}

/*!
    \reimp
 */
void QAbstractProxyModel::revert()
{
    Q_D(QAbstractProxyModel);
    d->model->revert();
}


/*!
  \fn QModelIndex QAbstractProxyModel::mapToSource(const QModelIndex &proxyIndex) const

  Reimplement this function to return the model index in the source model that
  corresponds to the \a proxyIndex in the proxy model.

  \sa mapFromSource()
*/

/*!
  \fn QModelIndex QAbstractProxyModel::mapFromSource(const QModelIndex &sourceIndex) const

  Reimplement this function to return the model index in the proxy model that
  corresponds to the \a sourceIndex from the source model.

  \sa mapToSource()
*/

/*!
  Returns a source selection mapped from the specified \a proxySelection.

  Reimplement this method to map proxy selections to source selections.
 */
QItemSelection QAbstractProxyModel::mapSelectionToSource(const QItemSelection &proxySelection) const
{
    QModelIndexList proxyIndexes = proxySelection.indexes();
    QItemSelection sourceSelection;
    for (int i = 0; i < proxyIndexes.size(); ++i)
        sourceSelection << QItemSelectionRange(mapToSource(proxyIndexes.at(i)));
    return sourceSelection;
}

/*!
  Returns a proxy selection mapped from the specified \a sourceSelection.

  Reimplement this method to map source selections to proxy selections.
*/
QItemSelection QAbstractProxyModel::mapSelectionFromSource(const QItemSelection &sourceSelection) const
{
    QModelIndexList sourceIndexes = sourceSelection.indexes();
    QItemSelection proxySelection;
    for (int i = 0; i < sourceIndexes.size(); ++i)
        proxySelection << QItemSelectionRange(mapFromSource(sourceIndexes.at(i)));
    return proxySelection;
}

/*!
    \reimp
 */
QVariant QAbstractProxyModel::data(const QModelIndex &proxyIndex, int role) const
{
    Q_D(const QAbstractProxyModel);
    return d->model->data(mapToSource(proxyIndex), role);
}

/*!
    \reimp
 */
QVariant QAbstractProxyModel::headerData(int section, Qt::Orientation orientation, int role) const
{
    Q_D(const QAbstractProxyModel);
    int sourceSection;
    if (orientation == Qt::Horizontal) {
        const QModelIndex proxyIndex = index(0, section);
        sourceSection = mapToSource(proxyIndex).column();
    } else {
        const QModelIndex proxyIndex = index(section, 0);
        sourceSection = mapToSource(proxyIndex).row();
    }
    return d->model->headerData(sourceSection, orientation, role);
}

/*!
    \reimp
 */
QMap<int, QVariant> QAbstractProxyModel::itemData(const QModelIndex &proxyIndex) const
{
    Q_D(const QAbstractProxyModel);
    return d->model->itemData(mapToSource(proxyIndex));
}

/*!
    \reimp
 */
Qt::ItemFlags QAbstractProxyModel::flags(const QModelIndex &index) const
{
    Q_D(const QAbstractProxyModel);
    return d->model->flags(mapToSource(index));
}

/*!
    \reimp
 */
bool QAbstractProxyModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
    Q_D(QAbstractProxyModel);
    return d->model->setData(mapToSource(index), value, role);
}

/*!
    \reimp
 */
bool QAbstractProxyModel::setHeaderData(int section, Qt::Orientation orientation, const QVariant &value, int role)
{
    Q_D(QAbstractProxyModel);
    int sourceSection;
    if (orientation == Qt::Horizontal) {
        const QModelIndex proxyIndex = index(0, section);
        sourceSection = mapToSource(proxyIndex).column();
    } else {
        const QModelIndex proxyIndex = index(section, 0);
        sourceSection = mapToSource(proxyIndex).row();
    }
    return d->model->setHeaderData(sourceSection, orientation, value, role);
}

QT_END_NAMESPACE

#include "moc_qabstractproxymodel.cpp"

#endif // QT_NO_PROXYMODEL