File indexing completed on 2024-04-14 03:53:59

 /*
     SPDX-FileCopyrightText: 2009 Stephen Kelly <steveire@gmail.com>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #include "kreparentingproxymodel.h"
 #include <QDebug>
 #include <QList>
 
 #include <algorithm>
 #include <functional>
 
 class KReparentingProxyModelPrivate
 {
     KReparentingProxyModelPrivate(KReparentingProxyModel *proxyModel)
         : m_nextId(0)
         , q_ptr(proxyModel)
     {
     }
 
     qint64 newId() const
     {
         return m_nextId++;
     }
 
     enum MapStrategy {
         MapDescendants,
         MapChildrenOnly,
     };
 
     /**
       Creates mappings of indexes in the source model between @p start
       and @p end which should be represented in the proxy model as descendants
       of @p parent.
     */
     QHash<QModelIndex, QModelIndexList> recreateMappings(const QModelIndex &parent, int start, int end = -1, int strategy = MapChildrenOnly) const;
 
     /**
       Merges all indexes from @p mappings which are descendants of @p parent into the model.
       Returns the remaining mappings.
 
       Note that this changes the internal model structure and must only be called between begin/end insert/remove/move/reset calls.
     */
     QHash<QModelIndex, QModelIndexList> mergeDescendants(QHash<QModelIndex, QModelIndexList> mappings, const QModelIndex &parent, int start);
 
     /**
       Verifies that the indexes below @p parent between @p start and rowCount(parent)
       are in the correct positions in the proxy model. Repositions them if not.
     */
     void verifyStructure(const QModelIndex &parent, int start);
 
     /**
       Returns the index vertically below index in the model @p model.
       If @p model is 0, the sourceModel is used
       Returns an invalid index if there is no index below @p index.
     */
     QModelIndex getIndexBelow(const QModelIndex &index, QAbstractItemModel *model = nullptr) const;
 
     /**
       Returns the last descendant of @p index or itself if it has no children
     */
     QModelIndex getLastDescendant(const QModelIndex &index) const;
 
     bool isDescendantInModel(const QModelIndex &ancestor, const QModelIndex &descendant) const;
 
     /**
       Returns the ancestors of @p descendant that are already in the proxy model.
 
       Note that @p descendant does not have to be in the proxy yet, and it is not part of the
       result list.
     */
     QList<QModelIndex> getExistingAncestors(const QModelIndex &descendant) const;
 
     void sourceRowsAboutToBeInserted(const QModelIndex &parent, int start, int end);
     void sourceRowsInserted(const QModelIndex &parent, int start, int end);
     void sourceRowsAboutToBeRemoved(const QModelIndex &parent, int start, int end);
     void sourceRowsRemoved(const QModelIndex &parent, int start, int end);
     void sourceRowsAboutToBeMoved(const QModelIndex &parent, int start, int end, const QModelIndex &destParent, int destRow);
     void sourceRowsMoved(const QModelIndex &parent, int start, int end, const QModelIndex &destParent, int destRow);
     void sourceModelAboutToBeReset();
     void endResetProxy();
     void sourceModelReset();
     void sourceLayoutAboutToBeChanged();
     void sourceLayoutChanged();
     void sourceDataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight);
 
     mutable QHash<qint64, QPersistentModelIndex> m_parents;
     mutable QHash<QPersistentModelIndex, QList<QPersistentModelIndex>> m_childIndexes;
 
     struct PendingInsertion {
         PendingInsertion()
             : parentId(-1)
             , start(-1)
             , end(-1)
         {
         }
 
         PendingInsertion(const QModelIndex &_index, int _start, int _end)
             : index(_index)
             , start(_start)
             , end(_end)
         {
         }
 
         QPersistentModelIndex index;
         QModelIndex sourceIndex;
         qint64 parentId;
         int start;
         int end;
     };
 
     struct PendingRemoval : PendingInsertion {
         int numTrailing;
     };
     // Needed between the beginRemoveRows and endRemoveRows signals.
     mutable QHash<qint64, QPersistentModelIndex> m_pendingRemovalParents;
     mutable QHash<QPersistentModelIndex, QList<QPersistentModelIndex>> m_pendingRemovalChildIndexes;
 
     QHash<QModelIndex, QModelIndexList> insertTree(QHash<QModelIndex, QModelIndexList> mappings, const QModelIndex &parent);
 
     void handleInsertion(const PendingInsertion &pendingInsertion);
 
     void handleRemoval(const PendingRemoval &pendingRemoval);
 
     mutable QHash<QModelIndex, PendingInsertion> m_pendingInsertions;
     mutable QList<PendingRemoval> m_pendingRemovals;
 
     mutable qint64 m_nextId;
 
     Q_DECLARE_PUBLIC(KReparentingProxyModel)
     KReparentingProxyModel *q_ptr;
 
     QList<QPersistentModelIndex> m_layoutChangePersistentIndexes;
     QModelIndexList m_proxyIndexes;
 
     void emitDataChangedSignals(const QModelIndex &parent, int maxChanged);
 
     /**
       Given @p parent in the proxy model, return the last index lying between @p start and @p end
       which is also a descendant of @p parent.
     */
     QModelIndex findLastInParent(QModelIndex parent, int start, int end);
 
     /**
       Removes @P idx (which is a source model index) and its children from the model data structures.
     */
     void removeTree(const QPersistentModelIndex &idx, int start = 0, int end = -1);
 
     int pendingRemovalRowCount(const QModelIndex &sourceIndex) const;
 };
 
 class LessThan
 {
     const KReparentingProxyModel *m_model;
 
 public:
     LessThan(const KReparentingProxyModel *model)
         : m_model(model)
     {
     }
     bool operator()(const QModelIndex &ancestor, const QModelIndex &descendant)
     {
         return m_model->isDescendantOf(ancestor, descendant);
     }
 };
 
 QModelIndex KReparentingProxyModelPrivate::getIndexBelow(const QModelIndex &index, QAbstractItemModel *model) const
 {
     Q_Q(const KReparentingProxyModel);
 
     //   qDebug() << index.data() << index;
 
     if (!model) {
         model = q->sourceModel();
     }
 
     if (model->hasChildren(index)) {
         return model->index(0, 0, index);
     }
 
     QModelIndex sibling = index.sibling(index.row() + 1, index.column());
     if (sibling.isValid()) {
         return sibling;
     }
 
     QModelIndex parent = index.parent();
 
     if (!parent.isValid()) {
         return QModelIndex();
     }
 
     int affectedRow = index.row();
     const int column = 0;
 
     while (parent.isValid()) {
         //     qDebug() << "parent" << parent.data() << model->rowCount(parent) << affectedRow;
         if (affectedRow < model->rowCount(parent) - 1) {
             return model->index(affectedRow + 1, column, parent);
         }
 
         affectedRow = parent.row();
         parent = parent.parent();
     }
 
     if (model->rowCount(parent) >= affectedRow) {
         return model->index(affectedRow + 1, column, parent);
     }
 
     return QModelIndex();
 }
 
 QModelIndex KReparentingProxyModelPrivate::getLastDescendant(const QModelIndex &index) const
 {
     Q_Q(const KReparentingProxyModel);
 
     QModelIndex proxyIndex = q->mapFromSource(index);
 
     while (q->hasChildren(proxyIndex)) {
         proxyIndex = q->index(q->rowCount(proxyIndex), proxyIndex.column(), proxyIndex);
         if (!proxyIndex.isValid()) {
             break;
         }
     }
     return q->mapToSource(proxyIndex);
 }
 
 QList<QModelIndex> KReparentingProxyModelPrivate::getExistingAncestors(const QModelIndex &descendant) const
 {
     Q_Q(const KReparentingProxyModel);
 
     QList<QModelIndex> vector;
     if (!descendant.isValid()) {
         return vector;
     }
 
     QModelIndex parent = q->mapFromSource(descendant).parent();
     QModelIndex sourceParent = q->mapToSource(parent);
     if (!sourceParent.isValid()) {
         return vector;
     }
 
     vector.append(sourceParent);
     while (parent.isValid()) {
         parent = parent.parent();
         sourceParent = q->mapToSource(parent);
         if (!sourceParent.isValid()) {
             return vector;
         }
         vector.prepend(sourceParent);
     }
     return vector;
 }
 
 QHash<QModelIndex, QModelIndexList> KReparentingProxyModelPrivate::recreateMappings(const QModelIndex &ancestor, int start, int end, int strategy) const
 {
     Q_Q(const KReparentingProxyModel);
     const int column = 0;
 
     QHash<QModelIndex, QModelIndexList> mappings;
     // Handle listing the root QModelIndex().
     if (!ancestor.isValid() && !q->sourceModel()->hasChildren())
     // Empty model. Nothing to do.
     {
         return mappings;
     }
 
     // A
     // - B
     // - - C
     // - D
     // If start refers to D, existing ancestors will contain only A.
     // We need to go 'up' to C and get its ancestors in case D is to be made a child of B or C (for example if B and C have just been inserted)
     QModelIndex indexAbove;
     if (start > 0) {
         indexAbove = getLastDescendant(q->sourceModel()->index(start - 1, column, ancestor));
     } else {
         indexAbove = ancestor;
     }
 
     QList<QModelIndex> ancestors = getExistingAncestors(indexAbove);
 
     //   ancestors.append(indexAbove);
     //   qDebug() << ancestors;
     QModelIndex nextIndex = ancestor;
 
     for (int row = start; (row <= end || end == -1);) {
         // A
         // - B
         // - - C
         // - D
         // The nextIndex of the invalid QModelIndex is A,
         // The nextIndex of A is B,
         // The nextIndex of B is C,
         // The nextIndex of C is D,
         // The nextIndex of D is invalid,
         // When the nextIndex is invalid we're finished creating mappings.
         if (MapDescendants == strategy) {
             nextIndex = getIndexBelow(nextIndex);
         } else {
             nextIndex = q->sourceModel()->index(row, column, ancestor);
         }
 
         if (!nextIndex.isValid()) {
             break;
         }
 
         const QList<QModelIndex>::iterator ancestorIt = std::lower_bound(ancestors.begin(), ancestors.end(), nextIndex, LessThan(q));
 
         ancestors.erase(ancestorIt, ancestors.end());
 
         QModelIndex parent;
         if (ancestorIt != ancestors.begin()) {
             parent = *(ancestorIt - 1);
         }
 
         ancestors.append(nextIndex);
 
         mappings[parent].append(nextIndex);
     }
 
     return mappings;
 }
 
 void KReparentingProxyModelPrivate::verifyStructure(const QModelIndex &sourceParent, int sourceStart)
 {
     Q_Q(KReparentingProxyModel);
 
     // If the start structure is:
 
     // C
     // D
     // E
 
     // and then A and B are inserted, we may need to move C D and E. Not all of the siblings will
     // necessarily be moved to the same destination parent.
     // Some example finished scenarios depending on the outcome of isDescendantOf:
 
     // A
     // B
     // C
     // D
     // E
 
     // A
     // B
     // - C
     // - D
     // - E
 
     // A
     // - B
     // - C
     // - D
     // - E
 
     // A
     // - B
     // - - C
     // - D
     // E
 
     // Local variable mappings now contains all the information about finished state
     // When we locate the first child to be moved, we process it and its siblings
 
     QHash<QModelIndex, QModelIndexList> mappings = recreateMappings(sourceParent, sourceStart, -1);
 
     if (mappings.isEmpty()) {
         return;
     }
 
     QModelIndex sourceFirstIndex = q->sourceModel()->index(sourceStart, 0, sourceParent);
 
     QModelIndex destinationParent;
     QModelIndexList movedIndexes;
 
     QHashIterator<QModelIndex, QModelIndexList> it(mappings);
     while (it.hasNext()) {
         it.next();
         //     qDebug() << it.key() << it.key().data() << it.value();
         if (it.value().at(0) == sourceFirstIndex) {
             destinationParent = it.key();
             movedIndexes = it.value();
             break;
         }
     }
 
     Q_FOREVER {
         if (destinationParent == sourceParent)
         // No indexes moved
         {
             return;
         }
 
         Q_ASSERT(destinationParent.isValid());
         Q_ASSERT(!movedIndexes.isEmpty());
 
         // It's only possible for things to move right, and even that's only an option
         // for children of parent, but not their descendants. ie, children of C D and E will not need to be reparented.
         // They are already in the correct positions.
 
         QList<QPersistentModelIndex> &existingSourceIndexes = m_childIndexes[sourceParent];
         QList<QPersistentModelIndex> existingDestinationIndexes = m_childIndexes[destinationParent];
 
         QModelIndex proxySourceParent = q->mapFromSource(sourceParent);
         QModelIndex proxyDestinationParent = q->mapFromSource(destinationParent);
 
         // That is, start position of indexes to be moved from the source parent.
         int proxySourceStart = m_childIndexes.value(sourceParent).indexOf(movedIndexes.at(0));
         int proxySourceEnd = proxySourceStart + movedIndexes.size() - 1;
 
         // The moved indexes are appended to the destinationParent. Nothing else is possible.
         // If they were to be inserted in the middle somewhere, they would already be there.
 
         int destinationRow = existingDestinationIndexes.size();
 
         bool allowMove = q->beginMoveRows(proxySourceParent, proxySourceStart, proxySourceEnd, proxyDestinationParent, destinationRow);
         Q_ASSERT(allowMove);
 
         for (int row = proxySourceEnd; row >= proxySourceStart; --row) {
             existingSourceIndexes.removeAt(row);
         }
 
         QHash<QModelIndex, QModelIndexList> mapping;
         mapping.insert(destinationParent, movedIndexes);
         mergeDescendants(mapping, destinationParent, existingDestinationIndexes.size());
 
         q->endMoveRows();
 
         if (!mappings.contains(q->mapToSource(proxyDestinationParent.parent()))) {
             break;
         }
 
         destinationParent = q->mapToSource(proxyDestinationParent.parent());
         movedIndexes = mappings.value(destinationParent);
     }
 }
 
 KReparentingProxyModel::KReparentingProxyModel(QObject *parent)
     : QAbstractProxyModel(parent)
     , d_ptr(new KReparentingProxyModelPrivate(this))
 {
 }
 
 KReparentingProxyModel::~KReparentingProxyModel()
 {
     delete d_ptr;
 }
 
 bool KReparentingProxyModelPrivate::isDescendantInModel(const QModelIndex &ancestor, const QModelIndex &descendant) const
 {
     //   qDebug() << ancestor.data() << descendant.data();
 
     //   if (!ancestor.isValid())
     //     return true;
 
     QModelIndex _ancestor = descendant.parent();
     while (_ancestor.isValid()) {
         if (_ancestor == ancestor) {
             return true;
         }
         _ancestor = _ancestor.parent();
     }
     return (!ancestor.isValid() && descendant.isValid());
 }
 
 bool KReparentingProxyModel::isDescendantOf(const QModelIndex &ancestor, const QModelIndex &descendant) const
 {
     Q_D(const KReparentingProxyModel);
     return d->isDescendantInModel(ancestor, descendant);
     //   return (!ancestor.isValid() && descendant.isValid());
 }
 
 QModelIndex KReparentingProxyModel::mapFromSource(const QModelIndex &sourceIndex) const
 {
     Q_D(const KReparentingProxyModel);
     if (!sourceIndex.isValid()) {
         return QModelIndex();
     }
 
     QModelIndex sourceIndexFirstColumn = sourceIndex.sibling(sourceIndex.row(), 0);
 
     QHash<QPersistentModelIndex, QList<QPersistentModelIndex>>::const_iterator it;
     const QHash<QPersistentModelIndex, QList<QPersistentModelIndex>>::const_iterator begin = d->m_childIndexes.constBegin();
     const QHash<QPersistentModelIndex, QList<QPersistentModelIndex>>::const_iterator end = d->m_childIndexes.constEnd();
 
     for (it = begin; it != end; ++it) {
         QList<QPersistentModelIndex> list = it.value();
         if (list.contains(sourceIndexFirstColumn)) {
             QModelIndex sourceParent = it.key();
             int row = list.indexOf(sourceIndexFirstColumn);
 
             // There must have been a mapping made for it.
             Q_ASSERT(d->m_parents.values().contains(sourceParent));
 
             qint64 id = d->m_parents.key(sourceParent);
 
             // id refers to the parent.
             return createIndex(row, sourceIndex.column(), reinterpret_cast<void *>(id));
         }
     }
     return QModelIndex();
 }
 
 QModelIndex KReparentingProxyModel::mapToSource(const QModelIndex &proxyIndex) const
 {
     Q_D(const KReparentingProxyModel);
 
     //   qDebug() << "MMMMMM" << proxyIndex;
 
     if (!proxyIndex.isValid()) {
         return QModelIndex();
     }
 
     qint64 id = reinterpret_cast<qint64>(proxyIndex.internalPointer());
 
     //   if (!d->m_parents.contains(id))
     //     qDebug() << d->m_parents << id;
 
     QModelIndex sourceParent;
     if (d->m_pendingRemovalParents.contains(id)) {
         //     qDebug() << "pending";
         sourceParent = d->m_pendingRemovalParents.value(id);
     } else {
         Q_ASSERT(d->m_parents.contains(id));
         sourceParent = d->m_parents.value(id);
     }
 
     // qDebug() <<  sourceParent << sourceParent.data();
 
     QModelIndex sourceIndexFirstColumn;
     if (d->m_pendingRemovalChildIndexes.contains(sourceParent)) {
         //     qDebug() << "#############";
 
         for (const KReparentingProxyModelPrivate::PendingRemoval &pendingRemoval : std::as_const(d->m_pendingRemovals)) {
             //       qDebug() << "In" << pendingRemoval.index << pendingRemoval.sourceIndex << sourceParent;
             if (pendingRemoval.sourceIndex == sourceParent) {
                 //         qDebug() << "Out" << pendingRemoval.sourceIndex << sourceParent;
                 int proxyRow = proxyIndex.row();
                 int row = proxyRow - pendingRemoval.start;
 
                 //         qDebug() << d->m_pendingRemovalChildIndexes.value(sourceParent) << proxyRow << row << pendingRemoval.end;
 
                 if (proxyRow > pendingRemoval.end) {
                     Q_ASSERT(d->m_childIndexes.contains(sourceParent));
                     row = proxyRow - (pendingRemoval.end - pendingRemoval.start + 1);
                     //           qDebug() << "new row" << row;
                     sourceIndexFirstColumn = d->m_childIndexes.value(sourceParent).at(row);
                 } else {
                     sourceIndexFirstColumn = d->m_pendingRemovalChildIndexes.value(sourceParent).at(row);
                 }
                 break;
             }
         }
     } else {
         Q_ASSERT(d->m_childIndexes.contains(sourceParent));
         sourceIndexFirstColumn = d->m_childIndexes.value(sourceParent).at(proxyIndex.row());
     }
 
     Q_ASSERT(sourceIndexFirstColumn.isValid());
 
     return sourceIndexFirstColumn.sibling(sourceIndexFirstColumn.row(), proxyIndex.column());
 }
 
 int KReparentingProxyModel::columnCount(const QModelIndex &parent) const
 {
     Q_D(const KReparentingProxyModel);
 
     if (!sourceModel()) {
         return 0;
     }
 
     if (!parent.isValid()) {
         return sourceModel()->columnCount();
     }
 
     if (parent.column() > 0) {
         return 0;
     }
     QModelIndex sourceIndex = mapToSource(parent);
 
     return (d->m_childIndexes.value(sourceIndex).size() > 0) ? sourceModel()->columnCount() : 0;
 }
 
 QVariant KReparentingProxyModel::data(const QModelIndex &proxyIndex, int role) const
 {
     return QAbstractProxyModel::data(proxyIndex, role);
 }
 
 QModelIndex KReparentingProxyModel::index(int row, int column, const QModelIndex &parent) const
 {
     Q_D(const KReparentingProxyModel);
 
     if (!hasIndex(row, column, parent)) {
         return QModelIndex();
     }
 
     QModelIndex sourceParent = mapToSource(parent);
 
     //   if (!d->m_pendingRemovals.isEmpty())
     //     qDebug() << sourceParent << sourceParent.data();
 
     // ### This is where we need to have the children of removed indexes stored.
 
     //   if (!d->m_parents.values().contains(sourceParent))
     //   {
     //     qDebug() << d->m_pendingRemovalParents.values() << sourceParent << d->m_pendingRemovalParents.values().contains(sourceParent);
     //   }
 
     qint64 id;
     if (d->m_pendingRemovalParents.values().contains(sourceParent)) {
         id = d->m_pendingRemovalParents.key(sourceParent);
     } else {
         // There must have been a mapping made for it.
         Q_ASSERT(d->m_parents.values().contains(sourceParent));
         id = d->m_parents.key(sourceParent);
     }
     return createIndex(row, column, reinterpret_cast<void *>(id));
 }
 
 QModelIndex KReparentingProxyModel::parent(const QModelIndex &child) const
 {
     Q_D(const KReparentingProxyModel);
 
     if (!child.isValid()) {
         return QModelIndex();
     }
 
     QModelIndex sourceIndex = mapToSource(child);
 
     QModelIndex firstColumnChild = sourceIndex;
     if (sourceIndex.column() > 0) {
         firstColumnChild = sourceIndex.sibling(sourceIndex.row(), 0);
     }
 
     QHashIterator<QPersistentModelIndex, QList<QPersistentModelIndex>> itPending(d->m_pendingRemovalChildIndexes);
 
     while (itPending.hasNext()) {
         itPending.next();
 
         if (itPending.value().contains(firstColumnChild)) {
             return mapFromSource(itPending.key());
         }
     }
 
     QHashIterator<QPersistentModelIndex, QList<QPersistentModelIndex>> it(d->m_childIndexes);
 
     while (it.hasNext()) {
         it.next();
 
         if (it.value().contains(firstColumnChild)) {
             return mapFromSource(it.key());
         }
     }
     return QModelIndex();
 }
 
 int KReparentingProxyModelPrivate::pendingRemovalRowCount(const QModelIndex &sourceIndex) const
 {
     for (const PendingRemoval &pendingRemoval : std::as_const(m_pendingRemovals)) {
         //     qDebug() << pendingRemoval.sourceIndex;
         if (pendingRemoval.sourceIndex == sourceIndex) {
             return pendingRemoval.end - pendingRemoval.start + 1;
         }
     }
     return 0;
 }
 
 int KReparentingProxyModel::rowCount(const QModelIndex &parent) const
 {
     Q_D(const KReparentingProxyModel);
 
     if (parent.column() > 0) {
         return 0;
     }
 
     QModelIndex sourceIndex = mapToSource(parent);
 
     int size = d->m_childIndexes.value(sourceIndex).size() + d->m_pendingRemovalChildIndexes.value(sourceIndex).size();
 
     //   qDebug() << d->m_pendingRemovalChildIndexes.value(sourceIndex).size();
 
     //   if (!d->m_pendingRemovals.isEmpty())
     //   {
     //     qDebug() << "SIZE" << sourceIndex << sourceIndex.data() << size << d->m_pendingRemovals.size() << d->pendingRemovalRowCount(sourceIndex);
     //   }
 
     return size;
 }
 
 bool KReparentingProxyModel::hasChildren(const QModelIndex &parent) const
 {
     return rowCount(parent) > 0;
 }
 
 void KReparentingProxyModel::setSourceModel(QAbstractItemModel *sourceModel)
 {
     Q_D(KReparentingProxyModel);
 
     beginResetModel();
 
     disconnect(sourceModel, SIGNAL(rowsAboutToBeInserted(QModelIndex, int, int)), this, SLOT(sourceRowsAboutToBeInserted(QModelIndex, int, int)));
     disconnect(sourceModel, SIGNAL(rowsInserted(QModelIndex, int, int)), this, SLOT(sourceRowsInserted(QModelIndex, int, int)));
     disconnect(sourceModel, SIGNAL(rowsAboutToBeRemoved(QModelIndex, int, int)), this, SLOT(sourceRowsAboutToBeRemoved(QModelIndex, int, int)));
     disconnect(sourceModel, SIGNAL(rowsRemoved(QModelIndex, int, int)), this, SLOT(sourceRowsRemoved(QModelIndex, int, int)));
     disconnect(sourceModel,
                SIGNAL(rowsAboutToBeMoved(QModelIndex, int, int, QModelIndex, int)),
                this,
                SLOT(sourceRowsAboutToBeMoved(QModelIndex, int, int, QModelIndex, int)));
     disconnect(sourceModel, SIGNAL(rowsMoved(QModelIndex, int, int, QModelIndex, int)), this, SLOT(sourceRowsMoved(QModelIndex, int, int, QModelIndex, int)));
     disconnect(sourceModel, SIGNAL(modelAboutToBeReset()), this, SLOT(sourceModelAboutToBeReset()));
     disconnect(sourceModel, SIGNAL(modelReset()), this, SLOT(sourceModelReset()));
     disconnect(sourceModel, SIGNAL(dataChanged(QModelIndex, QModelIndex)), this, SLOT(sourceDataChanged(QModelIndex, QModelIndex)));
     disconnect(sourceModel, SIGNAL(layoutAboutToBeChanged()), this, SLOT(sourceLayoutAboutToBeChanged()));
     disconnect(sourceModel, SIGNAL(layoutChanged()), this, SLOT(sourceLayoutChanged()));
 
     QAbstractProxyModel::setSourceModel(sourceModel);
 
     //   qDebug() << "set";
     QHash<QModelIndex, QModelIndexList> mappings =
         d->recreateMappings(QModelIndex(), 0, sourceModel->rowCount() - 1, KReparentingProxyModelPrivate::MapDescendants);
     //   qDebug() << "begin";
     d->mergeDescendants(mappings, QModelIndex(), 0);
 
     connect(sourceModel, SIGNAL(rowsAboutToBeInserted(QModelIndex, int, int)), SLOT(sourceRowsAboutToBeInserted(QModelIndex, int, int)));
     connect(sourceModel, SIGNAL(rowsInserted(QModelIndex, int, int)), SLOT(sourceRowsInserted(QModelIndex, int, int)));
     connect(sourceModel, SIGNAL(rowsAboutToBeRemoved(QModelIndex, int, int)), SLOT(sourceRowsAboutToBeRemoved(QModelIndex, int, int)));
     connect(sourceModel, SIGNAL(rowsRemoved(QModelIndex, int, int)), SLOT(sourceRowsRemoved(QModelIndex, int, int)));
     connect(sourceModel,
             SIGNAL(rowsAboutToBeMoved(QModelIndex, int, int, QModelIndex, int)),
             SLOT(sourceRowsAboutToBeMoved(QModelIndex, int, int, QModelIndex, int)));
     connect(sourceModel, SIGNAL(rowsMoved(QModelIndex, int, int, QModelIndex, int)), SLOT(sourceRowsMoved(QModelIndex, int, int, QModelIndex, int)));
     connect(sourceModel, SIGNAL(modelAboutToBeReset()), SLOT(sourceModelAboutToBeReset()));
     connect(sourceModel, SIGNAL(modelReset()), SLOT(sourceModelReset()));
     connect(sourceModel, SIGNAL(dataChanged(QModelIndex, QModelIndex)), SLOT(sourceDataChanged(QModelIndex, QModelIndex)));
     connect(sourceModel, SIGNAL(layoutAboutToBeChanged()), SLOT(sourceLayoutAboutToBeChanged()));
     connect(sourceModel, SIGNAL(layoutChanged()), SLOT(sourceLayoutChanged()));
 
     endResetModel();
 }
 
 void KReparentingProxyModelPrivate::sourceRowsAboutToBeInserted(const QModelIndex &parent, int start, int end)
 {
     Q_UNUSED(parent);
     Q_UNUSED(start);
     Q_UNUSED(end);
 
     Q_Q(KReparentingProxyModel);
     return q->beginResetModel();
 #if 0
     // We can't figure out the structure until the indexes are in the model.
     // Store the signal until the new rows are actually there in sourceRowsInserted.
     PendingInsertion pendingInsertion(parent, start, end);
     m_pendingInsertions.insert(parent, pendingInsertion);
 #endif
 }
 
 QHash<QModelIndex, QModelIndexList>
 KReparentingProxyModelPrivate::mergeDescendants(QHash<QModelIndex, QModelIndexList> mappings, const QModelIndex &parent, int start)
 {
     const QModelIndexList childIndexes = mappings.take(parent);
     //   qDebug() << childIndexes;
     if (!childIndexes.isEmpty()) {
         if (!m_parents.values().contains(parent)) {
             m_parents.insert(newId(), QPersistentModelIndex(parent));
         }
     }
     int row = start;
     for (const QModelIndex &idx : childIndexes) {
         m_childIndexes[parent].insert(row++, QPersistentModelIndex(idx));
         mappings = mergeDescendants(mappings, idx, 0);
     }
     return mappings;
 }
 
 QHash<QModelIndex, QModelIndexList> KReparentingProxyModelPrivate::insertTree(QHash<QModelIndex, QModelIndexList>, const QModelIndex &)
 {
     return QHash<QModelIndex, QModelIndexList>();
 }
 
 void KReparentingProxyModelPrivate::handleInsertion(const PendingInsertion &pendingInsertion)
 {
     Q_Q(KReparentingProxyModel);
     QModelIndex parent = pendingInsertion.index;
     int start = pendingInsertion.start;
     int end = pendingInsertion.end;
 
     //   qDebug() << parent << parent.data() << start << end;
 
     //   for (int i = start; i < end; ++i)
     //   {
     //     QModelIndex idx = q->sourceModel()->index(i, 0, parent);
     //     qDebug() << idx << idx.data();
     //   }
 
     QHash<QModelIndex, QModelIndexList> newItemMappings = recreateMappings(parent, start, end, KReparentingProxyModelPrivate::MapDescendants);
 
     // iterate over keys. if key in keys iterate up. This gives list of top level parents.
     // Pick the one whose parent is @p parent. Insert it. Look up until find the parent of another one and insert that.
     // If one of the parents is invalid it is necessarily the last one to be processed (if there are more to process, they'll be children of it)
     // That case should work too.
 
     //   qDebug() << "new item mappings" << newItemMappings;
 
     const int column = 0;
 
     //   qDebug() << m_childIndexes.contains(parent);
 
     if (newItemMappings.contains(parent)) {
         QModelIndexList newItemList = newItemMappings.value(parent);
         //     qDebug() << "newItemList" << newItemList;
         int proxyStart = 0;
 
         // A single insertion in the source model might be multiple insertions in the proxy model.
         Q_FOREVER {
             if (newItemList.isEmpty()) {
                 if (!newItemMappings.contains(parent.parent())) {
                     break;
                 }
 
                 newItemList = newItemMappings.value(parent.parent());
                 continue;
             }
 
             proxyStart = 0;
 
             QModelIndex proxyParent = q->mapFromSource(parent);
             if (start > 0) {
                 QModelIndex lastDesc = q->mapFromSource(getLastDescendant(q->sourceModel()->index(start - 1, column, parent)));
 
                 while (lastDesc.parent() != proxyParent) {
                     lastDesc = lastDesc.parent();
                 }
                 proxyStart = lastDesc.row() + 1;
             }
 
             q->beginInsertRows(proxyParent, proxyStart, proxyStart + newItemList.size() - 1);
 
             newItemMappings = mergeDescendants(newItemMappings, parent, proxyStart);
 
             q->endInsertRows();
 
             if (!newItemMappings.contains(parent.parent())) {
                 break;
             }
 
             newItemList = newItemMappings.value(parent.parent());
         }
     }
 
     //   // The rest are not descendants of pendingInsertion.index in the proxy model, but are elsewhere.
     //   Q_FOREACH(const QModelIndex &parent, newItemMappings.keys())
     //   {
     //
     //   }
 
     return;
 }
 
 void KReparentingProxyModelPrivate::sourceRowsInserted(const QModelIndex &parent, int, int end)
 {
     Q_UNUSED(parent);
     Q_UNUSED(end);
 
     return endResetProxy();
 
 #if 0
     Q_Q(KReparentingProxyModel);
     if (m_pendingInsertions.contains(parent)) {
         PendingInsertion pendingInsertion = m_pendingInsertions.value(parent);
         handleInsertion(pendingInsertion);
 
         if (q->sourceModel()->rowCount(parent) <= (end + 1)) {
             return;
         }
 
         // The presence of new rows might affect the structure of indexes below.
         verifyStructure(parent, end + 1);
     }
 #endif
 }
 
 void KReparentingProxyModelPrivate::removeTree(const QPersistentModelIndex &idxToRemove, int start, int end)
 {
     if (!m_childIndexes.contains(idxToRemove)) {
         return;
     }
 
     //   qDebug() << "idxToRemove" << idxToRemove << start << end;
 
     QList<QPersistentModelIndex> &toRemove = m_childIndexes[idxToRemove];
     //   qDebug() << toRemove << toRemove.size();
 
     //   QList<int> intList;
     //   intList << 1 << 2 << 3 << 4 << 5;
     //
     //   QList<int>::iterator intit = intList.begin();
     //   QList<int>::iterator intendIt = intList.end();
     //
     //   if (end == 0)
     //     intendIt = intit + 1;
     //
     //   if (end > 0)
     //   {
     //     intendIt = intit + (end - start + 1) + 1;
     //     qDebug() << "intend" << *intendIt;
     //   }
     //   intit += start;
     //
     //   while (intit != intendIt)
     //   {
     //     int i = *intit;
     //     qDebug() << i;
     //     intit = intList.erase(intit);
     //   }
 
     QList<QPersistentModelIndex>::iterator it = toRemove.begin();
     QList<QPersistentModelIndex>::iterator endIt = toRemove.end();
 
     if (end == 0) {
         endIt = it + 1;
     }
 
     if (end > 0) {
         endIt = it + (end - start + 1) + 1;
     }
     it += start;
 
     int i = start;
     while (it != endIt) {
         QPersistentModelIndex idx = *it;
         //     qDebug() << "removing" << idx << idx.data();
 
         if (m_parents.values().contains(idx)) {
             qint64 key = m_parents.key(idx);
             QPersistentModelIndex value = m_parents.take(key);
             m_pendingRemovalParents.insert(key, value);
             //       qDebug() << "take from parent" << value;
         }
         removeTree(idx);
 
         ++i;
 
         m_pendingRemovalChildIndexes[idxToRemove].append(idx);
         //     qDebug() << idxToRemove << idxToRemove.data() << idx << idx.data();
 
         it = toRemove.erase(it);
         //     qDebug() << (it == endIt);
         //     if (i > end)
         //       break;
 
         //     if (it == toRemove.end())
         //       break;
     }
 
     //   qDebug() << "toRemove" << toRemove;
 
     //   for(int i = start; (i <= end || (end == -1 && toRemove.size() > i)); )
     //   {
     //     qDebug() << i;
     //     QPersistentModelIndex idx = toRemove.takeAt(i);
     //     --end;
     //
     //     qDebug() << "removing" << idx.data();
     //
     //     if (m_parents.values().contains(idx))
     //     {
     //       QPersistentModelIndex bah = m_parents.take(m_parents.key(idx));
     // //       qDebug() << "take from parent" << bah;
     //     }
     //     removeTree(idx);
     //   }
 }
 
 void KReparentingProxyModelPrivate::sourceRowsAboutToBeRemoved(const QModelIndex &parent, int start, int end)
 {
     Q_UNUSED(parent);
     Q_UNUSED(start);
     Q_UNUSED(end);
 
     Q_Q(KReparentingProxyModel);
     q->beginResetModel();
 
     return;
 #if 0
 //   qDebug() << parent << start << end;
 
     // This is really tricky.
     //
     // We could have something like:
     //
     //   A              A
     //   B              - B
     //   C    ->        - - C
     //   D              D
     //   E              - E
     //
     // And have to remove something like B to D. That would mean a remove signal for B, move E to its grandparent, remove D.
 
 //   QHashIterator<QPersistentModelIndex, QList< QPersistentModelIndex> > it(m_childIndexes);
 //   while (it.hasNext())
 //   {
 //     it.next();
 //     qDebug() << it.key() << it.key().data();
 //     qDebug() << it.value();
 //   }
 
     const int column = 0;
 
     QModelIndex firstAffectedIndex = q->mapFromSource(q->sourceModel()->index(start, column, parent));
     QModelIndex lastAffectedIndex = q->mapFromSource(q->sourceModel()->index(end, column, parent));
 
 //   qDebug() << "firstAffectedIndex" << firstAffectedIndex.data();
 //   qDebug() << "lastAffectedIndex" << lastAffectedIndex.data();
 
     QModelIndex proxyParent = firstAffectedIndex.parent();
 
     Q_ASSERT(firstAffectedIndex.isValid() && lastAffectedIndex.isValid());
 
     Q_FOREVER {
     if (isDescendantInModel(proxyParent, lastAffectedIndex))
         {
             // They share a common ancestor.
 
             QModelIndex _parent = lastAffectedIndex.parent();
             QModelIndex lastAffectedAncestor = lastAffectedIndex;
 //       qDebug() << "last affected ancestor" << lastAffectedAncestor.data();
             while (_parent != proxyParent) {
                 lastAffectedAncestor = _parent;
                 _parent = _parent.parent();
             }
 
             if (q->hasChildren(lastAffectedAncestor)) {
                 QModelIndex next = q->index(0, 0, lastAffectedAncestor);
 
                 QModelIndex proxySourceParent = lastAffectedAncestor;
                 int startRow = next.row();
                 int lastRow = q->rowCount(lastAffectedAncestor) - 1;
 
                 QList<QPersistentModelIndex> &existingSourceIndexes = m_childIndexes[q->mapToSource(proxySourceParent)];
                 QList<QPersistentModelIndex> &existingDestinationIndexes = m_childIndexes[q->mapToSource(proxyParent)];
 
                 int destRow = lastAffectedAncestor.row() + 1;
 
 //         qDebug() << "Move from" << lastAffectedAncestor.data() << startRow << lastRow << " To " << proxyParent.data() << destRow;
                 bool allowMove = q->beginMoveRows(lastAffectedAncestor, startRow, lastRow, proxyParent, destRow);
                 Q_ASSERT(allowMove);
 
                 for (int i = startRow; i <= lastRow; ++i) {
                     QPersistentModelIndex movingIdx = existingSourceIndexes.takeAt(startRow);
                     existingDestinationIndexes.insert(destRow + (i - startRow), movingIdx);
                 }
 
                 // TODO: If source was a parent before, it might not be now.
                 // dest was already a parent.
 
                 q->endMoveRows();
             }
             PendingRemoval removal;
             removal.index = proxyParent;
             removal.start = firstAffectedIndex.row();
             removal.end = lastAffectedAncestor.row();
             removal.parentId = proxyParent.internalId();
             removal.sourceIndex = q->mapToSource(proxyParent);
             m_pendingRemovals.append(removal);
 
             removeTree(q->mapToSource(proxyParent), removal.start, removal.end);
 
 //       qDebug() << "beg rem 1";
             q->beginRemoveRows(proxyParent, removal.start, removal.end);
 
             return;
 
         } else {
             QModelIndex next = getIndexBelow(firstAffectedIndex);
 
             proxyParent = next.parent();
 
             while (isDescendantInModel(proxyParent, next))
             {
                 next = getIndexBelow(next);
             }
             QModelIndex _parent = next.parent();
             QModelIndex lastAffectedAncestor = next;
 
             while (_parent != proxyParent)
             {
                 lastAffectedAncestor = _parent;
                 _parent = _parent.parent();
             }
 
             PendingRemoval removal;
             removal.index = proxyParent;
             removal.start = firstAffectedIndex.row();
             removal.end = lastAffectedAncestor.row();
             removal.parentId = proxyParent.internalId();
             removal.sourceIndex = q->mapToSource(proxyParent);
             m_pendingRemovals.append(removal);
 
             removeTree(q->mapToSource(proxyParent), removal.start, removal.end);
 
 //       qDebug() << "beg rem 1";
             q->beginRemoveRows(proxyParent, removal.start, removal.end);
 
             proxyParent = next.parent();
         }
     }
 
 // //   qDebug() << proxyParent.data() << lastAffectedIndex.parent().data() << proxyParent << lastAffectedIndex.parent();
 //   if (proxyParent == lastAffectedIndex.parent())
 //   {
 //     PendingRemoval removal;
 //     removal.index = proxyParent;
 //     removal.start = firstAffectedIndex.row();
 //     removal.end = lastAffectedIndex.row();
 //     removal.parentId = proxyParent.internalId();
 //     removal.sourceIndex = q->mapToSource(proxyParent);
 //     m_pendingRemovals.append(removal);
 //
 //     // Also need to store a removal object for each of the descendants.
 //
 //     removeTree(q->mapToSource(proxyParent), removal.start, removal.end);
 //
 // //     qDebug() << "beg rem 1";
 //     q->beginRemoveRows(proxyParent, removal.start, removal.end);
 //     return;
 //   }
 //
 //   QModelIndex lastParent = lastAffectedIndex.parent();
 //   while (lastParent.parent().isValid())
 //   {
 //     if (lastParent.parent() == proxyParent)
 //     {
 //       PendingRemoval removal;
 //       removal.index = proxyParent;
 //       removal.start = firstAffectedIndex.row();
 //       removal.end = lastParent.row();
 //       removal.parentId = proxyParent.internalId();
 //       removal.sourceIndex = q->mapToSource(proxyParent);
 //       m_pendingRemovals.append(removal);
 //
 // //       qDebug() << "beg rem 2";
 //       q->beginRemoveRows(proxyParent, removal.start, removal.end);
 //       return;
 //     }
 //     lastParent = lastParent.parent();
 //   }
 //
 //   // Several blocks need to be removed from the proxy model.
 //   // Divide and conquer to find them.
 //
 //   int proxyStart = firstAffectedIndex.row();
 //   int proxyEnd = proxyStart + (end - start);
 //   int processedUntil = start;
 //
 //   while (processedUntil <= end)
 //   {
 //     QModelIndex lastInParent = findLastInParent(proxyParent, proxyStart, proxyEnd);
 //     qDebug() << "lastInParent" << lastInParent;
 //
 //     QModelIndex sourceLast = q->mapToSource(lastInParent);
 //     processedUntil = sourceLast.row();
 //
 //     PendingRemoval removal;
 //     removal.index = proxyParent;
 //     removal.start = proxyStart;
 //     removal.end = lastInParent.row();
 //     removal.parentId = proxyParent.internalId();
 //     removal.sourceIndex = q->mapToSource(proxyParent);
 //     m_pendingRemovals.append(removal);
 //
 //     qDebug() << "beg rem 3";
 //     q->beginRemoveRows(proxyParent, removal.start, removal.end);
 //
 //     QModelIndex proxyIndexBelow = getIndexBelow(lastInParent, q);
 //
 //     if (!proxyIndexBelow.isValid())
 //       return;
 //
 //     proxyParent = proxyIndexBelow.parent();
 //     proxyStart = proxyIndexBelow.row();
 //   }
 #endif
 }
 
 QModelIndex KReparentingProxyModelPrivate::findLastInParent(QModelIndex parent, int start, int end)
 {
     Q_Q(KReparentingProxyModel);
 
     const int column = 0;
 
     if (start == end) {
         return q->index(start, column, parent);
     }
 
     int middle = start + (end - start / 2);
 
     QModelIndex sourceParent = q->mapToSource(parent);
     QModelIndex middleIndex = q->mapFromSource(q->sourceModel()->index(middle, column, sourceParent));
 
     if (middleIndex.parent() == parent) {
         return findLastInParent(parent, middle, end);
     } else {
         return findLastInParent(parent, start + ((middle - start) / 2), middle);
     }
 }
 
 //   qDebug() << affectedIndex << affectedIndex.data() << proxyParent;
 //
 //   QHash<QModelIndex, PendingRemoval> pendingRemovals;
 //
 //   int i = start;
 //   while (i <= end)
 //   {
 //     affectedIndex = affectedIndex.sibling(i, column);
 //
 // //     affectedIndex = getIndexBelow(affectedIndex, q);
 //     if (!affectedIndex.isValid())
 //       break;
 // //     Q_ASSERT(affectedIndex.isValid());
 //
 //     if (affectedIndex.parent() != proxyParent)
 //     {
 //       // affectedIndex.parent() must be left of proxyParent
 //
 //       PendingRemoval removal;
 //       removal.index = proxyParent;
 //       removal.start = start;
 //       removal.end = i;
 //       pendingRemovals.insert(proxyParent, removal);
 //
 //       Q_EMIT q->rowsAboutToBeRemoved(proxyParent, start, i);
 //       proxyParent = affectedIndex.parent();
 //
 //       end -= (i - start + 1);
 //       start = affectedIndex.row();
 //       i = start;
 //     }
 //
 //     ++i;
 //   }
 
 // Move younger siblings out of the way so that the rows can be removed easily
 // No. It's easier to use verifyStructure afterward.
 
 //   // Removing rows in the source model could require sending the children to their grandparents.
 //
 //   QHash<QModelIndex, QModelIndexList> mappings;
 //   recreateMappings(parent, start, end);
 //
 //   QHashIterator<QModelIndex, QModelIndexList> it(mappings);
 //   while (it.hasNext())
 //   {
 //     it.next();
 //     QModelIndexList removedList = it.value();
 //     PendingRemoval pendingRemoval;
 //     pendingRemoval.index = it.key();
 //     pendingRemoval.start = q->mapFromSource(removedList.at(0)).row();
 //     pendingRemoval.end = pendingRemoval.start + removedList.size() - 1;
 //     m_pendingRemovals.insert(parent, pendingRemoval);
 //   }
 // }
 
 void KReparentingProxyModelPrivate::handleRemoval(const PendingRemoval &pendingRemoval)
 {
     Q_UNUSED(pendingRemoval)
     //   Q_Q(KReparentingProxyModel);
     //   q->beginRemoveRows(pendingRemoval.index, pendingRemoval.start, pendingRemoval.end);
     //   m_childIndexes.remove(pendingRemoval.index);
     //   // Remove stuff from m_parents.
     //   q->endRemoveRows();
 }
 
 void KReparentingProxyModelPrivate::sourceRowsRemoved(const QModelIndex &parent, int, int)
 {
     return endResetProxy();
 
     Q_Q(KReparentingProxyModel);
 
     // loop over pending removals and process each one. Then look after the last one
     // to move displaced rows to where they should be.
 
     int lastAffectedRow = m_pendingRemovals.last().end;
     QModelIndex lastAffectedIndex = m_pendingRemovals.last().index;
 
     QMutableListIterator<PendingRemoval> it(m_pendingRemovals);
 
     while (it.hasNext()) {
         PendingRemoval removal = it.next();
         m_pendingRemovalChildIndexes.remove(removal.sourceIndex);
         m_pendingRemovalParents.remove(parent.internalId());
         it.remove();
 
         Q_EMIT q->endRemoveRows();
     }
     //   qDebug() << "Remove done ##########";
 
     //   qDebug() << lastAffectedIndex << lastAffectedIndex.data() << lastAffectedRow;
 
     verifyStructure(lastAffectedIndex, lastAffectedRow - 1);
 }
 
 void KReparentingProxyModelPrivate::sourceRowsAboutToBeMoved(const QModelIndex &parent, int start, int end, const QModelIndex &, int)
 {
     // This could be several individual moves in the proxy model, or it could be no moves at all.
     // We can get the top indexes of the moved list and move those.
     // because their children won't be moved anywhere different.
 
     // I could look at the indexes between start and end (proxied could be several blocks), and move them to dest.
     // Then verify structure.
     // This could lead to an illegal move.
     // If we have
     //
     // Source:        Proxy:
     // A              A
     // B              B
     // C              - C
     // D              - D
     // E              E
     //
     // then source can legally move B to between C and D, however, implemented naively the proxymodel would attempt an illegal move.
     // We must first reparent everything below destRow in the proxy to the parent of parent in this case, then perform the move, then
     // verifyStructure.
     //
     // Moving B C and D to below E would be a legal move in the proxy model.
     //
     // Children of moved indexes which are not themselves moved must be first sent to their grandparents.
     // So if B and C were moved in the source model above to below E, D would first be moved to its grandparent, then B would be moved below E,
     // then the structure would need to be verified.
     //
     // Proxy start state:     Intermediate state:   Intermediate or final state:   Possible alternative final state:
     //       A                      A                     A                              A
     //       B                      B                     E                              E
     //       - C                    - C                   D                              - D
     //       - D                    D                     B                              B
     //       E                      E                     - C                            - C
 
     // So, I could iterate from start to end in proxySourceParent and if the depth goes less than parent, emit a block move, then start again.
 
     QHash<QModelIndex, QModelIndexList> newMappings = recreateMappings(parent, start, end);
 }
 
 void KReparentingProxyModelPrivate::sourceRowsMoved(const QModelIndex &, int, int, const QModelIndex &, int)
 {
 }
 
 void KReparentingProxyModelPrivate::sourceLayoutAboutToBeChanged()
 {
     Q_Q(KReparentingProxyModel);
 
     q->beginResetModel();
     return;
 #if 0
 
     Q_EMIT q->layoutAboutToBeChanged();
 
     Q_FOREACH (QPersistentModelIndex proxyPersistentIndex, q->persistentIndexList()) {
         m_proxyIndexes << proxyPersistentIndex;
         m_layoutChangePersistentIndexes << QPersistentModelIndex(q->mapToSource(proxyPersistentIndex));
     }
 #endif
 }
 
 void KReparentingProxyModelPrivate::sourceLayoutChanged()
 {
     endResetProxy();
     return;
 #if 0
     Q_Q(KReparentingProxyModel);
 
     for (int i = 0; i < m_proxyIndexes.size(); ++i) {
         q->changePersistentIndex(m_proxyIndexes.at(i), q->mapFromSource(m_layoutChangePersistentIndexes.at(i)));
     }
 
     m_layoutChangePersistentIndexes.clear();
     m_proxyIndexes.clear();
 
     Q_EMIT q->layoutChanged();
 #endif
 }
 
 void KReparentingProxyModelPrivate::sourceModelAboutToBeReset()
 {
     Q_Q(KReparentingProxyModel);
     q->beginResetModel();
 }
 
 void KReparentingProxyModelPrivate::endResetProxy()
 {
     Q_Q(KReparentingProxyModel);
 
     m_parents.clear();
     m_childIndexes.clear();
     m_nextId = 0;
     m_pendingInsertions.clear();
     m_pendingRemovals.clear();
     m_pendingRemovalChildIndexes.clear();
     m_pendingRemovalParents.clear();
     //   qDebug() << q->sourceModel()->rowCount();
     QHash<QModelIndex, QModelIndexList> mappings =
         recreateMappings(QModelIndex(), 0, q->sourceModel()->rowCount() - 1, KReparentingProxyModelPrivate::MapDescendants);
     qDebug() << mappings;
 
     mergeDescendants(mappings, QModelIndex(), 0);
     q->endResetModel();
 }
 
 void KReparentingProxyModelPrivate::sourceModelReset()
 {
     endResetProxy();
 }
 
 void KReparentingProxyModelPrivate::emitDataChangedSignals(const QModelIndex &startIndex, int maxChanged)
 {
     Q_Q(KReparentingProxyModel);
 
     QModelIndex proxyParent = startIndex.parent();
 
     int numChanged = 1;
 
     QModelIndex lastAffectedSibling = startIndex;
     QModelIndex proxySibling = getIndexBelow(startIndex, q);
 
     Q_FOREVER {
         if (proxySibling.parent() != proxyParent || numChanged >= maxChanged) {
             break;
         }
 
         numChanged++;
         lastAffectedSibling = proxySibling;
 
         proxySibling = getIndexBelow(proxySibling);
     }
 
     Q_EMIT q->dataChanged(startIndex, lastAffectedSibling);
     if (numChanged < maxChanged) {
         emitDataChangedSignals(proxySibling, maxChanged - numChanged);
     }
 }
 
 void KReparentingProxyModelPrivate::sourceDataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight)
 {
     Q_UNUSED(topLeft);
     Q_UNUSED(bottomRight);
 
     Q_Q(KReparentingProxyModel);
 
     q->beginResetModel();
     endResetProxy();
     return;
 #if 0
     QModelIndex parent = topLeft.parent();
     const int start = topLeft.row();
     const int end = bottomRight.row();
     const int column = 0;
     const int maxChanged = end - start + 1;
 
     // Create mappings to the end because changing data can affect structure of siblings.
     verifyStructure(parent, start);
 
     // mapFromSource and emit signals.
 
     QModelIndex proxyStartIndex = q->mapFromSource(q->sourceModel()->index(start, column, parent));
 
     emitDataChangedSignals(proxyStartIndex, maxChanged);
 #endif
 }
 
 Qt::DropActions KReparentingProxyModel::supportedDropActions() const
 {
     Q_ASSERT(sourceModel());
     return sourceModel()->supportedDropActions();
 }
 
 void KReparentingProxyModel::beginChangeRule()
 {
     Q_D(KReparentingProxyModel);
     d->sourceModelAboutToBeReset();
     //   beginResetModel();
     //   d->m_childIndexes.clear();
     //   d->m_layoutChangePersistentIndexes.clear();
     //   d->m_nextId = 1;
     //   d->m_parents.clear();
     //   d->m_pendingInsertions.clear();
     //   d->m_pendingRemovalChildIndexes.clear();
     //   d->m_pendingRemovalParents.clear();
     //   d->m_pendingRemovals.clear();
     //   d->m_proxyIndexes.clear();
 }
 
 void KReparentingProxyModel::endChangeRule()
 {
     Q_D(KReparentingProxyModel);
     d->endResetProxy();
     return;
 }
 
 #include "moc_kreparentingproxymodel.cpp"