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qproxymodel.cpp

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#include "qproxymodel.h"

#ifndef QT_NO_PROXYMODEL
#include <private/qproxymodel_p.h>
#include <qsize.h>
#include <qstringlist.h>

/*!
    \class QProxyModel
    \obsolete
    \brief The QProxyModel class provides support for processing data
    passed between another model and a view.

    \ingroup model-view

    If you want to do filtering and sorting, see QSortFilterProxyModel.

    Proxy models provide a standard model interface that can be used to
    manipulate the data retrieved through an underlying model. They can be used to
    perform operations such as sorting and filtering on the data obtained without
    changing the contents of the model.

    Just as with subclasses of QAbstractItemView, QProxyModel provides the setModel()
    function that is used to specify the model to be acted on by the proxy.
    Views can be connected to either the underlying model or the proxy model with
    \l QAbstractItemView::setModel().

    Since views rely on the information provided in model indexes to identify
    items of data from models, and to position these items in some visual
    representation, proxy models must create their own model indexes instead of
    supplying model indexes from their underlying models. 

    \sa \link model-view-programming.html Model/View Programming\endlink QAbstractItemModel

*/

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

00084 QProxyModel::QProxyModel(QObject *parent)
    : QAbstractItemModel(*new QProxyModelPrivate, parent)
{
    Q_D(QProxyModel);
    setModel(&d->empty);
}

/*!
    \internal
*/
00094 QProxyModel::QProxyModel(QProxyModelPrivate &dd, QObject *parent)
    : QAbstractItemModel(dd, parent)
{
    Q_D(QProxyModel);
    setModel(&d->empty);
}

/*!
    Destroys the proxy model.
*/
00104 QProxyModel::~QProxyModel()
{
}

/*!
    Sets the given \a model to be processed by the proxy model.
*/
00111 void QProxyModel::setModel(QAbstractItemModel *model)
{
    Q_D(QProxyModel);
    if (d->model && d->model != &d->empty)
        disconnectFromModel(d->model);
    if (model) {
        d->model = model;
        connectToModel(model);
    } else {
        d->model = &d->empty;
    }
}

/*!
    Returns the model that contains the data that is available through the
    proxy model.
*/
00128 QAbstractItemModel *QProxyModel::model() const
{
    Q_D(const QProxyModel);
    return d->model;
}

/*!
    Returns the model index with the given \a row, \a column, and \a parent.

    \sa QAbstractItemModel::index()
*/
00139 QModelIndex QProxyModel::index(int row, int column, const QModelIndex &parent) const
{
    Q_D(const QProxyModel);
    return setProxyModel(d->model->index(row, column, setSourceModel(parent)));
}

/*!
    Returns the model index that corresponds to the parent of the given \a child
    index.
*/
00149 QModelIndex QProxyModel::parent(const QModelIndex &child) const
{
    Q_D(const QProxyModel);
    return setProxyModel(d->model->parent(setSourceModel(child)));
}

/*!
    Returns the number of rows for the given \a parent.

    \sa QAbstractItemModel::rowCount()
*/
00160 int QProxyModel::rowCount(const QModelIndex &parent) const
{
    Q_D(const QProxyModel);
    return d->model->rowCount(setSourceModel(parent));
}

/*!
    Returns the number of columns for the given \a parent.

    \sa QAbstractItemModel::columnCount()
*/
00171 int QProxyModel::columnCount(const QModelIndex &parent) const
{
    Q_D(const QProxyModel);
    return d->model->columnCount(setSourceModel(parent));
}

/*!
    Returns true if the item corresponding to the \a parent index has child
    items; otherwise returns false.

    \sa QAbstractItemModel::hasChildren()
*/
00183 bool QProxyModel::hasChildren(const QModelIndex &parent) const
{
    Q_D(const QProxyModel);
    return d->model->hasChildren(setSourceModel(parent));
}

/*!
    Returns the data stored in the item with the given \a index under the
    specified \a role.
*/
00193 QVariant QProxyModel::data(const QModelIndex &index, int role) const
{
    Q_D(const QProxyModel);
    return d->model->data(setSourceModel(index), role);
}

/*!
    Sets the \a role data for the item at \a index to \a value.
    Returns true if successful; otherwise returns false.

    The base class implementation returns false. This function and
    data() must be reimplemented for editable models.

    \sa data() itemData() QAbstractItemModel::setData()
*/
00208 bool QProxyModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
    Q_D(const QProxyModel);
    return d->model->setData(setSourceModel(index), value, role);
}

/*!
    Returns the data stored in the \a section of the header with specified
    \a orientation under the given \a role.
*/
00218 QVariant QProxyModel::headerData(int section, Qt::Orientation orientation, int role) const
{
    Q_D(const QProxyModel);
    return d->model->headerData(section, orientation, role);
}

/*!
    Sets the \a role data in the \a section of the header with the specified
    \a orientation to the \a value given.

    \sa QAbstractItemModel::setHeaderData()
*/
00230 bool QProxyModel::setHeaderData(int section, Qt::Orientation orientation,
                                const QVariant &value, int role)
{
    Q_D(const QProxyModel);
    return d->model->setHeaderData(section, orientation, value, role);
}

/*!
    Returns a list of MIME types that are supported by the model.
*/
00240 QStringList QProxyModel::mimeTypes() const
{
    Q_D(const QProxyModel);
    return d->model->mimeTypes();
}

/*!
    Returns MIME data for the specified \a indexes in the model.
*/
00249 QMimeData *QProxyModel::mimeData(const QModelIndexList &indexes) const
{
    Q_D(const QProxyModel);
    QModelIndexList lst;
    for (int i = 0; i < indexes.count(); ++i)
        lst.append(setSourceModel(indexes.at(i)));
    return d->model->mimeData(lst);
}

/*!
    Returns true if the model accepts the \a data dropped onto an attached
    view for the specified \a action; otherwise returns false.

    The \a parent, \a row, and \a column details can be used to control
    which MIME types are acceptable to different parts of a model when
    received via the drag and drop system.
*/
00266 bool QProxyModel::dropMimeData(const QMimeData *data, Qt::DropAction action,
                               int row, int column, const QModelIndex &parent)
{
    Q_D(const QProxyModel);
    return d->model->dropMimeData(data, action, row, column, setSourceModel(parent));
}

/*!
    Returns the drop actions that are supported by the model; this is
    a combination of the individual actions defined in \l Qt::DropActions.

    The selection of drop actions provided by the model will influence the
    behavior of the component that started the drag and drop operation.

    \sa \link dnd.html Drag and Drop\endlink
*/
00282 Qt::DropActions QProxyModel::supportedDropActions() const
{
    Q_D(const QProxyModel);
    return d->model->supportedDropActions();
}

/*!
    Inserts \a count rows into the model, creating new items as children of
    the given \a parent. The new rows are inserted before the \a row
    specified. If the \a parent item has no children, a single column is
    created to contain the required number of rows.

    Returns true if the rows were successfully inserted; otherwise
    returns false.

    \sa QAbstractItemModel::insertRows()*/
00298 bool QProxyModel::insertRows(int row, int count, const QModelIndex &parent)
{
    Q_D(const QProxyModel);
    return d->model->insertRows(row, count, setSourceModel(parent));
}

/*!
    Inserts \a count columns into the model, creating new items as children of
    the given \a parent. The new columns are inserted before the \a column
    specified. If the \a parent item has no children, a single row is created
    to contain the required number of columns.

    Returns true if the columns were successfully inserted; otherwise
    returns false.

    \sa QAbstractItemModel::insertColumns()
*/
00315 bool QProxyModel::insertColumns(int column, int count, const QModelIndex &parent)
{
    Q_D(const QProxyModel);
    return d->model->insertColumns(column, count, setSourceModel(parent));
}

/*!
    Fetches more child items of the given \a parent. This function is used by views
    to tell the model that they can display more data than the model has provided.

    \sa QAbstractItemModel::fetchMore()
*/
00327 void QProxyModel::fetchMore(const QModelIndex &parent)
{
    Q_D(const QProxyModel);
    d->model->fetchMore(parent);
}

/*!
    Returns the item flags for the given \a index.
*/
00336 Qt::ItemFlags QProxyModel::flags(const QModelIndex &index) const
{
    Q_D(const QProxyModel);
    return d->model->flags(setSourceModel(index));
}

/*!
    Sorts the child items in the specified \a column according to the sort
    order defined by \a order.

    \sa QAbstractItemModel::sort()
*/
00348 void QProxyModel::sort(int column, Qt::SortOrder order)
{
    Q_D(QProxyModel);
    d->model->sort(column, order);
}

/*!
    Returns a list of model indexes that each contain the given \a value for
    the \a role specified. The search begins at the \a start index and is
    performed according to the specified \a flags. The search continues until
    the number of matching data items equals \a hits, the last row is reached,
    or the search reaches \a start again, depending on whether \c MatchWrap is
    specified in \a flags.

    \sa QAbstractItemModel::match()
*/
00364 QModelIndexList QProxyModel::match(const QModelIndex &start,
                                   int role, const QVariant &value,
                                   int hits, Qt::MatchFlags flags) const
{
    Q_D(const QProxyModel);
    return d->model->match(start, role, value, hits, flags);
}

/*!
    Returns the size of the item that corresponds to the specified \a index.
*/
00375 QSize QProxyModel::span(const QModelIndex &index) const
{
    Q_D(const QProxyModel);
    return d->model->span(setSourceModel(index));
}

/*!
 */
00383 bool QProxyModel::submit()
{
    Q_D(QProxyModel);
    return d->model->submit();
}

/*!
 */
00391 void QProxyModel::revert()
{
    Q_D(QProxyModel);
    d->model->revert();
}

/*!
    \internal
    Change the model pointer in the given \a source_index to point to the proxy model.
 */
00401 QModelIndex QProxyModel::setProxyModel(const QModelIndex &source_index) const
{
    QModelIndex proxy_index = source_index;
    if (proxy_index.isValid())
        proxy_index.m = this;
    return proxy_index;
}

/*!
    \internal
    Change the model pointer in the given \a proxy_index to point to the source model.
 */
00413 QModelIndex QProxyModel::setSourceModel(const QModelIndex &proxy_index) const
{
    Q_D(const QProxyModel);
    QModelIndex source_index = proxy_index;
    source_index.m = d->model;
    return source_index;
}

/*!
  \internal
  Connect to all the signals emitted by given \a model.
*/
00425 void QProxyModel::connectToModel(const QAbstractItemModel *model) const
{
    connect(model, SIGNAL(dataChanged(QModelIndex,QModelIndex)),
            this, SLOT(_q_sourceDataChanged(QModelIndex,QModelIndex)));
    connect(model, SIGNAL(headerDataChanged(Qt::Orientation,int,int)),
            this, SIGNAL(headerDataChanged(Qt::Orientation,int,int))); // signal to signal
    connect(model, SIGNAL(rowsAboutToBeInserted(QModelIndex,int,int)),
            this, SLOT(_q_sourceRowsAboutToBeInserted(QModelIndex,int,int)));
    connect(model, SIGNAL(rowsInserted(QModelIndex,int,int)),
            this, SLOT(_q_sourceRowsInserted(QModelIndex,int,int)));
    connect(model, SIGNAL(rowsAboutToBeRemoved(QModelIndex,int,int)),
            this, SLOT(_q_sourceRowsAboutToBeRemoved(QModelIndex,int,int)));
    connect(model, SIGNAL(rowsRemoved(QModelIndex,int,int)),
            this, SLOT(_q_sourceRowsRemoved(QModelIndex,int,int)));
    connect(model, SIGNAL(columnsAboutToBeInserted(QModelIndex,int,int)),
            this, SLOT(_q_sourceColumnsAboutToBeInserted(QModelIndex,int,int)));
    connect(model, SIGNAL(columnsInserted(QModelIndex,int,int)),
            this, SLOT(_q_sourceColumnsInserted(QModelIndex,int,int)));
    connect(model, SIGNAL(columnsAboutToBeRemoved(QModelIndex,int,int)),
            this, SLOT(_q_sourceColumnsAboutToBeRemoved(QModelIndex,int,int)));
    connect(model, SIGNAL(columnsRemoved(QModelIndex,int,int)),
            this, SLOT(_q_sourceColumnsRemoved(QModelIndex,int,int)));
    connect(model, SIGNAL(modelReset()), this, SIGNAL(modelReset())); // signal to signal
    connect(model, SIGNAL(layoutAboutToBeChanged()), this, SIGNAL(layoutAboutToBeChanged())); // signal to signal
    connect(model, SIGNAL(layoutChanged()), this, SIGNAL(layoutChanged())); // signal to signal
}

/*!
  \internal
  Disconnect from all the signals emitted by the given \a model.
 */
00456 void QProxyModel::disconnectFromModel(const QAbstractItemModel *model) const
{
    disconnect(model, SIGNAL(dataChanged(QModelIndex,QModelIndex)),
               this, SLOT(_q_sourceDataChanged(QModelIndex,QModelIndex)));
    disconnect(model, SIGNAL(headerDataChanged(Qt::Orientation,int,int)),
               this, SIGNAL(headerDataChanged(Qt::Orientation,int,int))); // signal to signal
    disconnect(model, SIGNAL(rowsAboutToBeInserted(QModelIndex,int,int)),
               this, SLOT(_q_sourceRowsAboutToBeInserted(QModelIndex,int,int)));
    disconnect(model, SIGNAL(rowsInserted(QModelIndex,int,int)),
               this, SLOT(rowsInserted(QModelIndex,int,int)));
    disconnect(model, SIGNAL(rowsAboutToBeRemoved(QModelIndex,int,int)),
               this, SLOT(_q_sourceRowsAboutToBeRemoved(QModelIndex,int,int)));
    disconnect(model, SIGNAL(rowsRemoved(QModelIndex,int,int)),
               this, SLOT(_q_sourceRowsRemoved(QModelIndex,int,int)));
    disconnect(model, SIGNAL(columnsAboutToBeInserted(QModelIndex,int,int)),
               this, SLOT(_q_sourceColumnsAboutToBeInserted(QModelIndex,int,int)));
    disconnect(model, SIGNAL(columnsInserted(QModelIndex,int,int)),
               this, SLOT(_q_sourceColumnsInserted(QModelIndex,int,int)));
    disconnect(model, SIGNAL(columnsAboutToBeRemoved(QModelIndex,int,int)),
               this, SLOT(_q_sourceColumnsAboutToBeRemoved(QModelIndex,int,int)));
    disconnect(model, SIGNAL(columnsRemoved(QModelIndex,int,int)),
               this, SLOT(_q_sourceColumnsRemoved(QModelIndex,int,int)));
    disconnect(model, SIGNAL(modelReset()), this, SIGNAL(modelReset())); // signal to signal
    disconnect(model, SIGNAL(layoutAboutToBeChanged()), this, SIGNAL(layoutAboutToBeChanged())); // signal to signal
    disconnect(model, SIGNAL(layoutChanged()), this, SIGNAL(layoutChanged())); // signal to signal
}

/*!
  \fn QObject *QProxyModel::parent() const
  \internal
*/

void QProxyModelPrivate::_q_sourceDataChanged(const QModelIndex &tl,const QModelIndex &br)
{
    Q_Q(QProxyModel);
    emit q->dataChanged(q->setProxyModel(tl), q->setProxyModel(br));
}

void QProxyModelPrivate::_q_sourceRowsAboutToBeInserted(const QModelIndex &parent, int first ,int last)
{
    Q_Q(QProxyModel);
    q->beginInsertRows(q->setProxyModel(parent), first, last);
}

void QProxyModelPrivate::_q_sourceRowsInserted(const QModelIndex &, int, int)
{
    Q_Q(QProxyModel);
    q->endInsertRows();
}

void QProxyModelPrivate::_q_sourceRowsAboutToBeRemoved(const QModelIndex &parent, int first, int last)
{
    Q_Q(QProxyModel);
    q->beginRemoveRows(q->setProxyModel(parent), first, last);
}

void QProxyModelPrivate::_q_sourceRowsRemoved(const QModelIndex &, int, int)
{
    Q_Q(QProxyModel);
    q->endRemoveRows();
}

void QProxyModelPrivate::_q_sourceColumnsAboutToBeInserted(const QModelIndex &parent, int first, int last)
{
    Q_Q(QProxyModel);
    q->beginInsertColumns(q->setProxyModel(parent), first, last);
}

void QProxyModelPrivate::_q_sourceColumnsInserted(const QModelIndex &, int, int)
{
    Q_Q(QProxyModel);
    q->endInsertColumns();
}

void QProxyModelPrivate::_q_sourceColumnsAboutToBeRemoved(const QModelIndex &parent, int first, int last)
{
    Q_Q(QProxyModel);
    q->beginRemoveColumns(q->setProxyModel(parent), first, last);
}


void QProxyModelPrivate::_q_sourceColumnsRemoved(const QModelIndex &, int, int)
{
    Q_Q(QProxyModel);
    q->endRemoveColumns();
}

#include "moc_qproxymodel.cpp"
#endif // QT_NO_PROXYMODEL

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