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/**************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Installer Framework.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
**************************************************************************/
#include "componentsortfilterproxymodel.h"
namespace QInstaller {
/*!
\class QInstaller::ComponentSortFilterProxyModel
\inmodule QtInstallerFramework
\brief The ComponentSortFilterProxyModel provides support for sorting and
filtering data passed between another model and a view.
The class subclasses QSortFilterProxyModel. Compared to the base class,
filters affect also child indexes in the base model, meaning if a
certain row has a parent that is accepted by filter, it is also accepted.
A distinction is made betweed directly and indirectly accepted indexes.
*/
/*!
\enum ComponentSortFilterProxyModel::AcceptType
This enum holds the possible values for filter acception type for model indexes.
\value Direct
Index was accepted directly by filter.
\value Descendant
Index is a descendant of an accepted index.
\value Rejected
Index was not accepted by filter.
*/
/*!
Constructs object with \a parent.
*/
ComponentSortFilterProxyModel::ComponentSortFilterProxyModel(QObject *parent)
: QSortFilterProxyModel(parent)
{
}
/*!
Returns a list of source model indexes that were accepted directly by the filter.
*/
QVector<QModelIndex> ComponentSortFilterProxyModel::directlyAcceptedIndexes() const
{
QVector<QModelIndex> indexes;
for (int i = 0; i < rowCount(); i++) {
QModelIndex childIndex = index(i, 0, QModelIndex());
findDirectlyAcceptedIndexes(childIndex, indexes);
}
return indexes;
}
/*!
Returns \c true if the item in the row indicated by the given \a sourceRow and
\a sourceParent should be included in the model; otherwise returns \c false.
*/
bool ComponentSortFilterProxyModel::filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const
{
return acceptsRow(sourceRow, sourceParent);
}
/*!
Returns \c true if the item in the row indicated by the given \a sourceRow and
\a sourceParent should be included in the model; otherwise returns \c false. The
acception type can be retrieved with \a type.
*/
bool ComponentSortFilterProxyModel::acceptsRow(int sourceRow, const QModelIndex &sourceParent,
AcceptType *type) const
{
if (type)
*type = AcceptType::Rejected;
if (QSortFilterProxyModel::filterAcceptsRow(sourceRow, sourceParent)) {
if (type)
*type = AcceptType::Direct;
return true;
}
if (!isRecursiveFilteringEnabled()) // filter not applied for children
return false;
if (!sourceParent.isValid()) // already root
return false;
int currentRow = sourceParent.row();
QModelIndex currentParent = sourceParent.parent();
// Ascend and check if any parent is accepted
forever {
if (QSortFilterProxyModel::filterAcceptsRow(currentRow, currentParent)) {
if (type)
*type = AcceptType::Descendant;
return true;
}
if (!currentParent.isValid()) // we hit a root node
break;
currentRow = currentParent.row();
currentParent = currentParent.parent();
}
return false;
}
/*!
Finds directly accepted child \a indexes for parent index \a in. Returns \c true
if at least one accepted index was found, \c false otherwise.
*/
bool ComponentSortFilterProxyModel::findDirectlyAcceptedIndexes(const QModelIndex &in, QVector<QModelIndex> &indexes) const
{
bool found = false;
for (int i = 0; i < rowCount(in); i++) {
if (findDirectlyAcceptedIndexes(index(i, 0, in), indexes))
found = true;
}
if (!hasChildren(in) || !found) { // No need to check current if any child matched
AcceptType acceptType;
const QModelIndex sourceIndex = mapToSource(in);
acceptsRow(sourceIndex.row(), sourceIndex.parent(), &acceptType);
if (acceptType == AcceptType::Direct) {
indexes.append(in);
found = true;
}
}
return found;
}
} // namespace QInstaller
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