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130 lines
4.4 KiB
C++
130 lines
4.4 KiB
C++
/*
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Copyright (c) 2009 Stephen Kelly <steveire@gmail.com>
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This library is free software; you can redistribute it and/or modify it
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under the terms of the GNU Library General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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This library is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
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License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA.
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*/
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#ifndef KREPARENTINGPROXYMODEL_H
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#define KREPARENTINGPROXYMODEL_H
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#include <QAbstractProxyModel>
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class KReparentingProxyModelPrivate;
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/**
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@brief Restructures a source model, changing the parents of items.
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Subclasses can change the structure of a source model by reimplementing
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the isDescendantOf method.
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For example, if the source model is a list,
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@verbatim
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0
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- A
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- B
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- C
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- D
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- E
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@endverbatim
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It could be converted to a tree by an implementation something like:
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@code
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bool MyReparentingModel::isDescedantOf(const QModelIndex& ancestor, const QModelIndex& descendant ) const
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{
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return (
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(ancestor.data().toString() == "A" && descendant.data().toString() == "B")
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|| (ancestor.data().toString() == "A" && descendant.data().toString() == "C")
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|| (ancestor.data().toString() == "B" && descendant.data().toString() == "C")
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|| (ancestor.data().toString() == "A" && descendant.data().toString() == "D")
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)
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? true : KReparentingProxyModel::isDescendantOf(ancestor, descendant);
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}
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@endcode
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to get this result:
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@verbatim
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0
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- A
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- - B
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- - - C
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- - D
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- E
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@endverbatim
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Note that the implementation returns true for a query if "C" is a descendant of "A".
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The implementation must return the correct value for all of its descendants, not only its direct parent.
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The actual location to insert the descendant in the tree is determined internally by a binary find algorithm.
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*/
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class KReparentingProxyModel : public QAbstractProxyModel
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{
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Q_OBJECT
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public:
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explicit KReparentingProxyModel(QObject* parent = 0);
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~KReparentingProxyModel();
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virtual QModelIndex mapFromSource(const QModelIndex& sourceIndex) const;
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virtual QModelIndex mapToSource(const QModelIndex& proxyIndex) const;
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virtual void setSourceModel(QAbstractItemModel* sourceModel);
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/**
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Reimplement this to return whether @p descendant is a descendant of @p ancestor.
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*/
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virtual bool isDescendantOf(const QModelIndex& ancestor, const QModelIndex& descendant ) const;
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virtual int columnCount(const QModelIndex& parent = QModelIndex()) const;
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virtual QVariant data(const QModelIndex& proxyIndex, int role = Qt::DisplayRole) const;
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virtual QModelIndex index(int row, int column, const QModelIndex& parent = QModelIndex()) const;
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virtual QModelIndex parent(const QModelIndex& child) const;
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virtual int rowCount(const QModelIndex& parent = QModelIndex()) const;
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virtual bool hasChildren(const QModelIndex& parent = QModelIndex()) const;
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virtual Qt::DropActions supportedDropActions() const;
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private:
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Q_DECLARE_PRIVATE(KReparentingProxyModel)
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//@cond PRIVATE
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KReparentingProxyModelPrivate *d_ptr;
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Q_PRIVATE_SLOT(d_func(), void sourceRowsAboutToBeInserted(const QModelIndex &, int, int))
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Q_PRIVATE_SLOT(d_func(), void sourceRowsInserted(const QModelIndex &, int, int))
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Q_PRIVATE_SLOT(d_func(), void sourceRowsAboutToBeRemoved(const QModelIndex &, int, int))
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Q_PRIVATE_SLOT(d_func(), void sourceRowsRemoved(const QModelIndex &, int, int))
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Q_PRIVATE_SLOT(d_func(), void sourceRowsAboutToBeMoved(const QModelIndex &, int, int, const QModelIndex &, int))
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Q_PRIVATE_SLOT(d_func(), void sourceRowsMoved(const QModelIndex &, int, int, const QModelIndex &, int))
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Q_PRIVATE_SLOT(d_func(), void sourceModelAboutToBeReset())
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Q_PRIVATE_SLOT(d_func(), void sourceModelReset())
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Q_PRIVATE_SLOT(d_func(), void sourceLayoutAboutToBeChanged())
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Q_PRIVATE_SLOT(d_func(), void sourceLayoutChanged())
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Q_PRIVATE_SLOT(d_func(), void sourceDataChanged(const QModelIndex &, const QModelIndex &))
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//@endcond
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};
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#endif
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