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Diffstat (limited to 'src/widgets/itemviews/qproxymodel.cpp')
| -rw-r--r-- | src/widgets/itemviews/qproxymodel.cpp | 547 |
1 files changed, 547 insertions, 0 deletions
diff --git a/src/widgets/itemviews/qproxymodel.cpp b/src/widgets/itemviews/qproxymodel.cpp new file mode 100644 index 0000000000..9a232a6a74 --- /dev/null +++ b/src/widgets/itemviews/qproxymodel.cpp @@ -0,0 +1,547 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** 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 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 "qproxymodel.h" + +#ifndef QT_NO_PROXYMODEL +#include <private/qproxymodel_p.h> +#include <qsize.h> +#include <qstringlist.h> + +QT_BEGIN_NAMESPACE + +/*! + \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. +*/ + +QProxyModel::QProxyModel(QObject *parent) + : QAbstractItemModel(*new QProxyModelPrivate, parent) +{ + Q_D(QProxyModel); + setModel(&d->empty); +} + +/*! + \internal +*/ +QProxyModel::QProxyModel(QProxyModelPrivate &dd, QObject *parent) + : QAbstractItemModel(dd, parent) +{ + Q_D(QProxyModel); + setModel(&d->empty); +} + +/*! + Destroys the proxy model. +*/ +QProxyModel::~QProxyModel() +{ +} + +/*! + Sets the given \a model to be processed by the proxy model. +*/ +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. +*/ +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() +*/ +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. +*/ +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() +*/ +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() +*/ +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() +*/ +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. +*/ +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() +*/ +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. +*/ +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() +*/ +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. +*/ +QStringList QProxyModel::mimeTypes() const +{ + Q_D(const QProxyModel); + return d->model->mimeTypes(); +} + +/*! + Returns MIME data for the specified \a indexes in the model. +*/ +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. +*/ +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 +*/ +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()*/ +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() +*/ +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() +*/ +void QProxyModel::fetchMore(const QModelIndex &parent) +{ + Q_D(const QProxyModel); + d->model->fetchMore(parent); +} + +/*! + Returns the item flags for the given \a index. +*/ +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() +*/ +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() +*/ +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. +*/ +QSize QProxyModel::span(const QModelIndex &index) const +{ + Q_D(const QProxyModel); + return d->model->span(setSourceModel(index)); +} + +/*! + */ +bool QProxyModel::submit() +{ + Q_D(QProxyModel); + return d->model->submit(); +} + +/*! + */ +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. + */ +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. + */ +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. +*/ +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. + */ +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(); +} + +QT_END_NAMESPACE + +#include "moc_qproxymodel.cpp" + +#endif // QT_NO_PROXYMODEL |