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Clementine-audio-player-Mac.../src/core/mergedproxymodel.cpp

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/* This file is part of Clementine.
Copyright 2010-2012, David Sansome <me@davidsansome.com>
Copyright 2011, Arnaud Bienner <arnaud.bienner@gmail.com>
Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
Copyright 2014, John Maguire <john.maguire@gmail.com>
Clementine is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Clementine is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Clementine. If not, see <http://www.gnu.org/licenses/>.
*/
#include "mergedproxymodel.h"
#include "core/logging.h"
#include <QStringList>
#include <limits>
// boost::multi_index still relies on these being in the global namespace.
using std::placeholders::_1;
using std::placeholders::_2;
#include <boost/multi_index_container.hpp>
#include <boost/multi_index/member.hpp>
#include <boost/multi_index/hashed_index.hpp>
#include <boost/multi_index/ordered_index.hpp>
using boost::multi_index::hashed_unique;
using boost::multi_index::identity;
using boost::multi_index::indexed_by;
using boost::multi_index::member;
using boost::multi_index::multi_index_container;
using boost::multi_index::ordered_unique;
using boost::multi_index::tag;
std::size_t hash_value(const QModelIndex& index) { return qHash(index); }
namespace {
struct Mapping {
explicit Mapping(const QModelIndex& _source_index) :
source_index(_source_index) {}
QModelIndex source_index;
};
struct tag_by_source {};
struct tag_by_pointer {};
} // namespace
class MergedProxyModelPrivate {
private:
typedef multi_index_container<
Mapping*,
indexed_by<
hashed_unique<tag<tag_by_source>,
member<Mapping, QModelIndex, &Mapping::source_index> >,
ordered_unique<tag<tag_by_pointer>, identity<Mapping*> > > >
MappingContainer;
public:
MappingContainer mappings_;
};
MergedProxyModel::MergedProxyModel(QObject* parent)
: QAbstractProxyModel(parent),
resetting_model_(nullptr),
p_(new MergedProxyModelPrivate) {}
MergedProxyModel::~MergedProxyModel() { DeleteAllMappings(); }
void MergedProxyModel::DeleteAllMappings() {
const auto& begin = p_->mappings_.get<tag_by_pointer>().begin();
const auto& end = p_->mappings_.get<tag_by_pointer>().end();
qDeleteAll(begin, end);
}
void MergedProxyModel::AddSubModel(const QModelIndex& source_parent,
QAbstractItemModel* submodel) {
connect(submodel, SIGNAL(modelReset()), this, SLOT(SubModelReset()));
connect(submodel, SIGNAL(rowsAboutToBeInserted(QModelIndex, int, int)), this,
SLOT(RowsAboutToBeInserted(QModelIndex, int, int)));
connect(submodel, SIGNAL(rowsAboutToBeRemoved(QModelIndex, int, int)), this,
SLOT(RowsAboutToBeRemoved(QModelIndex, int, int)));
connect(submodel, SIGNAL(rowsInserted(QModelIndex, int, int)), this,
SLOT(RowsInserted(QModelIndex, int, int)));
connect(submodel, SIGNAL(rowsRemoved(QModelIndex, int, int)), this,
SLOT(RowsRemoved(QModelIndex, int, int)));
connect(submodel, SIGNAL(dataChanged(QModelIndex, QModelIndex)), this,
SLOT(DataChanged(QModelIndex, QModelIndex)));
QModelIndex proxy_parent = mapFromSource(source_parent);
const int rows = submodel->rowCount();
if (rows) beginInsertRows(proxy_parent, 0, rows - 1);
merge_points_.insert(submodel, source_parent);
if (rows) endInsertRows();
}
void MergedProxyModel::RemoveSubModel(const QModelIndex& source_parent) {
// Find the submodel that the parent corresponded to
QAbstractItemModel* submodel = merge_points_.key(source_parent);
merge_points_.remove(submodel);
// The submodel might have been deleted already so we must be careful not
// to dereference it.
// Remove all the children of the item that got deleted
QModelIndex proxy_parent = mapFromSource(source_parent);
// We can't know how many children it had, since we can't dereference it
resetting_model_ = submodel;
beginRemoveRows(proxy_parent, 0, std::numeric_limits<int>::max() - 1);
endRemoveRows();
resetting_model_ = nullptr;
// Delete all the mappings that reference the submodel
auto it = p_->mappings_.get<tag_by_pointer>().begin();
auto end = p_->mappings_.get<tag_by_pointer>().end();
while (it != end) {
if ((*it)->source_index.model() == submodel) {
delete *it;
it = p_->mappings_.get<tag_by_pointer>().erase(it);
} else {
++it;
}
}
}
void MergedProxyModel::setSourceModel(QAbstractItemModel* source_model) {
if (sourceModel()) {
disconnect(sourceModel(), SIGNAL(modelReset()), this,
SLOT(SourceModelReset()));
disconnect(sourceModel(),
SIGNAL(rowsAboutToBeInserted(QModelIndex, int, int)), this,
SLOT(RowsAboutToBeInserted(QModelIndex, int, int)));
disconnect(sourceModel(),
SIGNAL(rowsAboutToBeRemoved(QModelIndex, int, int)), this,
SLOT(RowsAboutToBeRemoved(QModelIndex, int, int)));
disconnect(sourceModel(), SIGNAL(rowsInserted(QModelIndex, int, int)), this,
SLOT(RowsInserted(QModelIndex, int, int)));
disconnect(sourceModel(), SIGNAL(rowsRemoved(QModelIndex, int, int)), this,
SLOT(RowsRemoved(QModelIndex, int, int)));
disconnect(sourceModel(), SIGNAL(dataChanged(QModelIndex, QModelIndex)),
this, SLOT(DataChanged(QModelIndex, QModelIndex)));
disconnect(sourceModel(), SIGNAL(layoutAboutToBeChanged()), this,
SLOT(LayoutAboutToBeChanged()));
disconnect(sourceModel(), SIGNAL(layoutChanged()), this,
SLOT(LayoutChanged()));
}
QAbstractProxyModel::setSourceModel(source_model);
connect(sourceModel(), SIGNAL(modelReset()), this, SLOT(SourceModelReset()));
connect(sourceModel(), SIGNAL(rowsAboutToBeInserted(QModelIndex, int, int)),
this, SLOT(RowsAboutToBeInserted(QModelIndex, int, int)));
connect(sourceModel(), SIGNAL(rowsAboutToBeRemoved(QModelIndex, int, int)),
this, SLOT(RowsAboutToBeRemoved(QModelIndex, int, int)));
connect(sourceModel(), SIGNAL(rowsInserted(QModelIndex, int, int)), this,
SLOT(RowsInserted(QModelIndex, int, int)));
connect(sourceModel(), SIGNAL(rowsRemoved(QModelIndex, int, int)), this,
SLOT(RowsRemoved(QModelIndex, int, int)));
connect(sourceModel(), SIGNAL(dataChanged(QModelIndex, QModelIndex)), this,
SLOT(DataChanged(QModelIndex, QModelIndex)));
connect(sourceModel(), SIGNAL(layoutAboutToBeChanged()), this,
SLOT(LayoutAboutToBeChanged()));
connect(sourceModel(), SIGNAL(layoutChanged()), this, SLOT(LayoutChanged()));
}
void MergedProxyModel::SourceModelReset() {
// Delete all mappings
DeleteAllMappings();
// Clear the containers
p_->mappings_.clear();
merge_points_.clear();
// Reset the proxy
reset();
}
void MergedProxyModel::SubModelReset() {
QAbstractItemModel* submodel = static_cast<QAbstractItemModel*>(sender());
// TODO(David Sansome): When we require Qt 4.6, use beginResetModel() and
// endResetModel() in LibraryModel and catch those here - that will let
// us do away with this std::numeric_limits<int>::max() hack.
// Remove all the children of the item that got deleted
QModelIndex source_parent = merge_points_.value(submodel);
QModelIndex proxy_parent = mapFromSource(source_parent);
// We can't know how many children it had, since it's already disappeared...
resetting_model_ = submodel;
beginRemoveRows(proxy_parent, 0, std::numeric_limits<int>::max() - 1);
endRemoveRows();
resetting_model_ = nullptr;
// Delete all the mappings that reference the submodel
auto it = p_->mappings_.get<tag_by_pointer>().begin();
auto end = p_->mappings_.get<tag_by_pointer>().end();
while (it != end) {
if ((*it)->source_index.model() == submodel) {
delete *it;
it = p_->mappings_.get<tag_by_pointer>().erase(it);
} else {
++it;
}
}
// "Insert" items from the newly reset submodel
int count = submodel->rowCount();
if (count) {
beginInsertRows(proxy_parent, 0, count - 1);
endInsertRows();
}
emit SubModelReset(proxy_parent, submodel);
}
QModelIndex MergedProxyModel::GetActualSourceParent(
const QModelIndex& source_parent, QAbstractItemModel* model) const {
if (!source_parent.isValid() && model != sourceModel())
return merge_points_.value(model);
return source_parent;
}
void MergedProxyModel::RowsAboutToBeInserted(const QModelIndex& source_parent,
int start, int end) {
beginInsertRows(
mapFromSource(GetActualSourceParent(
source_parent, static_cast<QAbstractItemModel*>(sender()))),
start, end);
}
void MergedProxyModel::RowsInserted(const QModelIndex&, int, int) {
endInsertRows();
}
void MergedProxyModel::RowsAboutToBeRemoved(const QModelIndex& source_parent,
int start, int end) {
beginRemoveRows(
mapFromSource(GetActualSourceParent(
source_parent, static_cast<QAbstractItemModel*>(sender()))),
start, end);
}
void MergedProxyModel::RowsRemoved(const QModelIndex&, int, int) {
endRemoveRows();
}
QModelIndex MergedProxyModel::mapToSource(const QModelIndex& proxy_index)
const {
if (!proxy_index.isValid()) return QModelIndex();
Mapping* mapping = static_cast<Mapping*>(proxy_index.internalPointer());
if (p_->mappings_.get<tag_by_pointer>().find(mapping) ==
p_->mappings_.get<tag_by_pointer>().end())
return QModelIndex();
if (mapping->source_index.model() == resetting_model_) return QModelIndex();
return mapping->source_index;
}
QModelIndex MergedProxyModel::mapFromSource(const QModelIndex& source_index)
const {
if (!source_index.isValid()) return QModelIndex();
if (source_index.model() == resetting_model_) return QModelIndex();
// Add a mapping if we don't have one already
const auto& it = p_->mappings_.get<tag_by_source>().find(source_index);
Mapping* mapping;
if (it != p_->mappings_.get<tag_by_source>().end()) {
mapping = *it;
} else {
mapping = new Mapping(source_index);
const_cast<MergedProxyModel*>(this)->p_->mappings_.insert(mapping);
}
return createIndex(source_index.row(), source_index.column(), mapping);
}
QModelIndex MergedProxyModel::index(int row, int column,
const QModelIndex& parent) const {
QModelIndex source_index;
if (!parent.isValid()) {
source_index = sourceModel()->index(row, column, QModelIndex());
} else {
QModelIndex source_parent = mapToSource(parent);
const QAbstractItemModel* child_model = merge_points_.key(source_parent);
if (child_model)
source_index = child_model->index(row, column, QModelIndex());
else
source_index = source_parent.model()->index(row, column, source_parent);
}
return mapFromSource(source_index);
}
QModelIndex MergedProxyModel::parent(const QModelIndex& child) const {
QModelIndex source_child = mapToSource(child);
if (source_child.model() == sourceModel())
return mapFromSource(source_child.parent());
if (!IsKnownModel(source_child.model())) return QModelIndex();
if (!source_child.parent().isValid())
return mapFromSource(merge_points_.value(GetModel(source_child)));
return mapFromSource(source_child.parent());
}
int MergedProxyModel::rowCount(const QModelIndex& parent) const {
if (!parent.isValid()) return sourceModel()->rowCount(QModelIndex());
QModelIndex source_parent = mapToSource(parent);
if (!IsKnownModel(source_parent.model())) return 0;
const QAbstractItemModel* child_model = merge_points_.key(source_parent);
if (child_model) {
// Query the source model but disregard what it says, so it gets a chance
// to lazy load
source_parent.model()->rowCount(source_parent);
return child_model->rowCount(QModelIndex());
}
return source_parent.model()->rowCount(source_parent);
}
int MergedProxyModel::columnCount(const QModelIndex& parent) const {
if (!parent.isValid()) return sourceModel()->columnCount(QModelIndex());
QModelIndex source_parent = mapToSource(parent);
if (!IsKnownModel(source_parent.model())) return 0;
const QAbstractItemModel* child_model = merge_points_.key(source_parent);
if (child_model) return child_model->columnCount(QModelIndex());
return source_parent.model()->columnCount(source_parent);
}
bool MergedProxyModel::hasChildren(const QModelIndex& parent) const {
if (!parent.isValid()) return sourceModel()->hasChildren(QModelIndex());
QModelIndex source_parent = mapToSource(parent);
if (!IsKnownModel(source_parent.model())) return false;
const QAbstractItemModel* child_model = merge_points_.key(source_parent);
if (child_model)
return child_model->hasChildren(QModelIndex()) ||
source_parent.model()->hasChildren(source_parent);
return source_parent.model()->hasChildren(source_parent);
}
QVariant MergedProxyModel::data(const QModelIndex& proxyIndex, int role) const {
QModelIndex source_index = mapToSource(proxyIndex);
if (!IsKnownModel(source_index.model())) return QVariant();
return source_index.model()->data(source_index, role);
}
QMap<int, QVariant> MergedProxyModel::itemData(const QModelIndex& proxy_index)
const {
QModelIndex source_index = mapToSource(proxy_index);
if (!source_index.isValid()) return sourceModel()->itemData(QModelIndex());
return source_index.model()->itemData(source_index);
}
Qt::ItemFlags MergedProxyModel::flags(const QModelIndex& index) const {
QModelIndex source_index = mapToSource(index);
if (!source_index.isValid()) return sourceModel()->flags(QModelIndex());
return source_index.model()->flags(source_index);
}
bool MergedProxyModel::setData(const QModelIndex& index, const QVariant& value,
int role) {
QModelIndex source_index = mapToSource(index);
if (!source_index.isValid())
return sourceModel()->setData(index, value, role);
return GetModel(index)->setData(index, value, role);
}
QStringList MergedProxyModel::mimeTypes() const {
QStringList ret;
ret << sourceModel()->mimeTypes();
for (const QAbstractItemModel* model : merge_points_.keys()) {
ret << model->mimeTypes();
}
return ret;
}
QMimeData* MergedProxyModel::mimeData(const QModelIndexList& indexes) const {
if (indexes.isEmpty()) return 0;
// Only ask the first index's model
const QAbstractItemModel* model = mapToSource(indexes[0]).model();
if (!model) {
return 0;
}
// Only ask about the indexes that are actually in that model
QModelIndexList indexes_in_model;
for (const QModelIndex& proxy_index : indexes) {
QModelIndex source_index = mapToSource(proxy_index);
if (source_index.model() != model) continue;
indexes_in_model << source_index;
}
return model->mimeData(indexes_in_model);
}
bool MergedProxyModel::dropMimeData(const QMimeData* data,
Qt::DropAction action, int row, int column,
const QModelIndex& parent) {
if (!parent.isValid()) {
return false;
}
return sourceModel()->dropMimeData(data, action, row, column, parent);
}
QModelIndex MergedProxyModel::FindSourceParent(const QModelIndex& proxy_index)
const {
if (!proxy_index.isValid()) return QModelIndex();
QModelIndex source_index = mapToSource(proxy_index);
if (source_index.model() == sourceModel()) return source_index;
return merge_points_.value(GetModel(source_index));
}
bool MergedProxyModel::canFetchMore(const QModelIndex& parent) const {
QModelIndex source_index = mapToSource(parent);
if (!source_index.isValid())
return sourceModel()->canFetchMore(QModelIndex());
return source_index.model()->canFetchMore(source_index);
}
void MergedProxyModel::fetchMore(const QModelIndex& parent) {
QModelIndex source_index = mapToSource(parent);
if (!source_index.isValid())
sourceModel()->fetchMore(QModelIndex());
else
GetModel(source_index)->fetchMore(source_index);
}
QAbstractItemModel* MergedProxyModel::GetModel(const QModelIndex& source_index)
const {
// This is essentially const_cast<QAbstractItemModel*>(source_index.model()),
// but without the const_cast
const QAbstractItemModel* const_model = source_index.model();
if (const_model == sourceModel()) return sourceModel();
for (QAbstractItemModel* submodel : merge_points_.keys()) {
if (submodel == const_model) return submodel;
}
return nullptr;
}
void MergedProxyModel::DataChanged(const QModelIndex& top_left,
const QModelIndex& bottom_right) {
emit dataChanged(mapFromSource(top_left), mapFromSource(bottom_right));
}
void MergedProxyModel::LayoutAboutToBeChanged() {
old_merge_points_.clear();
for (QAbstractItemModel* key : merge_points_.keys()) {
old_merge_points_[key] = merge_points_.value(key);
}
}
void MergedProxyModel::LayoutChanged() {
for (QAbstractItemModel* key : merge_points_.keys()) {
if (!old_merge_points_.contains(key)) continue;
const int old_row = old_merge_points_[key].row();
const int new_row = merge_points_[key].row();
if (old_row != new_row) {
reset();
return;
}
}
}
bool MergedProxyModel::IsKnownModel(const QAbstractItemModel* model) const {
if (model == this || model == sourceModel() ||
merge_points_.contains(const_cast<QAbstractItemModel*>(model)))
return true;
return false;
}
QModelIndexList MergedProxyModel::mapFromSource(
const QModelIndexList& source_indexes) const {
QModelIndexList ret;
for (const QModelIndex& index : source_indexes) {
ret << mapFromSource(index);
}
return ret;
}
QModelIndexList MergedProxyModel::mapToSource(
const QModelIndexList& proxy_indexes) const {
QModelIndexList ret;
for (const QModelIndex& index : proxy_indexes) {
ret << mapToSource(index);
}
return ret;
}
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