396 lines
11 KiB
C++
396 lines
11 KiB
C++
#include "StatusQ/movablemodel.h"
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#include <algorithm>
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#include <QDebug>
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MovableModel::MovableModel(QObject* parent)
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: QAbstractListModel{parent}
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{
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}
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void MovableModel::setSourceModel(QAbstractItemModel* sourceModel)
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{
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if (m_sourceModel == sourceModel)
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return;
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beginResetModel();
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if (m_sourceModel != nullptr)
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disconnect(m_sourceModel, nullptr, this, nullptr);
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m_sourceModel = sourceModel;
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syncOrderInternal();
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emit sourceModelChanged();
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endResetModel();
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}
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QAbstractItemModel* MovableModel::sourceModel() const
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{
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return m_sourceModel;
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}
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int MovableModel::rowCount(const QModelIndex &parent) const
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{
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if (!m_synced)
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return m_indexes.size();
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if (m_sourceModel == nullptr)
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return 0;
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return m_sourceModel->rowCount();
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}
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QVariant MovableModel::data(const QModelIndex &index, int role) const
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{
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if (!checkIndex(index, CheckIndexOption::IndexIsValid))
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return {};
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if (!m_synced)
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return m_indexes.at(index.row()).data(role);
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if (m_sourceModel == nullptr)
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return {};
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return m_sourceModel->index(index.row(), index.column()).data(role);
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}
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QHash<int, QByteArray> MovableModel::roleNames() const
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{
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if (m_sourceModel == nullptr)
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return {};
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return m_sourceModel->roleNames();
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}
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void MovableModel::desyncOrder()
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{
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if (m_synced)
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{
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m_indexes.clear();
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m_synced = false;
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emit syncedChanged();
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}
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if (m_sourceModel != nullptr)
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{
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disconnect(m_sourceModel, &QAbstractItemModel::rowsAboutToBeInserted, this,
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&MovableModel::beginInsertRows);
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disconnect(m_sourceModel, &QAbstractItemModel::rowsInserted, this,
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&MovableModel::endInsertRows);
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disconnect(m_sourceModel, &QAbstractItemModel::rowsAboutToBeRemoved, this,
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&MovableModel::beginRemoveRows);
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disconnect(m_sourceModel, &QAbstractItemModel::rowsRemoved, this,
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&MovableModel::endRemoveRows);
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disconnect(m_sourceModel, &QAbstractItemModel::rowsAboutToBeMoved, this,
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&MovableModel::beginMoveRows);
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disconnect(m_sourceModel, &QAbstractItemModel::rowsMoved, this,
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&MovableModel::endMoveRows);
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disconnect(m_sourceModel, &QAbstractItemModel::dataChanged, this,
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&MovableModel::syncedSourceDataChanged);
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disconnect(m_sourceModel, &QAbstractItemModel::layoutAboutToBeChanged, this,
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&MovableModel::sourceLayoutAboutToBeChanged);
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disconnect(m_sourceModel, &QAbstractItemModel::layoutChanged, this,
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&MovableModel::sourceLayoutChanged);
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connect(m_sourceModel, &QAbstractItemModel::dataChanged, this,
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&MovableModel::desyncedSourceDataChanged);
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connect(m_sourceModel, &QAbstractItemModel::rowsInserted, this,
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&MovableModel::sourceRowsInserted);
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connect(m_sourceModel, &QAbstractItemModel::rowsAboutToBeRemoved, this,
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&MovableModel::sourceRowsAboutToBeRemoved);
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auto count = m_sourceModel->rowCount();
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m_indexes.reserve(count);
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for (auto i = 0; i < count; i++)
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m_indexes.emplace_back(m_sourceModel->index(i, 0));
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}
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}
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void MovableModel::syncOrder()
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{
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if (m_synced || m_sourceModel == nullptr)
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return;
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emit layoutAboutToBeChanged();
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syncOrderInternal();
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emit layoutChanged();
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}
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void MovableModel::syncOrderInternal()
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{
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if (m_sourceModel)
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{
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auto sourceModel = m_sourceModel;
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disconnect(m_sourceModel, nullptr, this, nullptr);
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connectSignalsForSyncedState();
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for (int i = 0; i < m_indexes.size(); ++i) {
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const QModelIndex idx = m_indexes[i];
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if (i == idx.row())
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continue;
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changePersistentIndex(index(i, 0), index(idx.row(), 0));
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}
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}
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m_indexes.clear();
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if (!m_synced)
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{
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m_synced = true;
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emit syncedChanged();
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}
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}
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void MovableModel::move(int from, int to, int count)
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{
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const int rows = rowCount();
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if (from < 0 || to < 0 || count <= 0
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|| from + count > rows || to + count > rows) {
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qWarning() << "MovableModel: move: out of range";
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return;
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}
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if (from == to)
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return;
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const int sourceFirst = from;
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const int sourceLast = from + count - 1;
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const int destinationRow = to < from ? to : to + count;
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if (m_synced)
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desyncOrder();
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beginMoveRows({}, sourceFirst, sourceLast, {}, destinationRow);
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std::vector<QPersistentModelIndex> movedIndexes;
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movedIndexes.reserve(count);
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std::move(m_indexes.begin() + sourceFirst,
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m_indexes.begin() + sourceLast + 1,
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std::back_insert_iterator(movedIndexes));
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m_indexes.erase(m_indexes.begin() + sourceFirst,
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m_indexes.begin() + sourceLast + 1);
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m_indexes.insert(m_indexes.begin() + to,
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std::move_iterator(movedIndexes.begin()),
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std::move_iterator(movedIndexes.end()));
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endMoveRows();
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}
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QVector<int> MovableModel::order() const
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{
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QVector<int> order(rowCount());
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if (!m_synced)
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std::transform(m_indexes.begin(), m_indexes.end(), order.begin(),
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[](auto& idx) { return idx.row(); });
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else
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std::iota(order.begin(), order.end(), 0);
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return order;
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}
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bool MovableModel::synced() const
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{
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return m_synced;
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}
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void MovableModel::resetInternalData()
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{
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QAbstractListModel::resetInternalData();
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if (!m_synced)
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syncOrder();
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}
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void MovableModel::syncedSourceDataChanged(const QModelIndex& topLeft,
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const QModelIndex& bottomRight,
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const QVector<int>& roles)
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{
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emit dataChanged(index(topLeft.row(), topLeft.column()),
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index(bottomRight.row(), bottomRight.column()), roles);
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}
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void MovableModel::sourceLayoutAboutToBeChanged(
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const QList<QPersistentModelIndex>& parents,
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QAbstractItemModel::LayoutChangeHint hint)
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{
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emit layoutAboutToBeChanged();
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const auto persistentIndexes = persistentIndexList();
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for (const QModelIndex& persistentIndex: persistentIndexes) {
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m_proxyIndexes << persistentIndex;
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Q_ASSERT(persistentIndex.isValid());
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const auto srcIndex = m_sourceModel->index(
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persistentIndex.row(),
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persistentIndex.column());
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Q_ASSERT(srcIndex.isValid());
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m_layoutChangePersistentIndexes << srcIndex;
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}
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}
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void MovableModel::sourceLayoutChanged(
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const QList<QPersistentModelIndex>& parents,
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QAbstractItemModel::LayoutChangeHint hint)
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{
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for (int i = 0; i < m_proxyIndexes.size(); ++i) {
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auto p = m_layoutChangePersistentIndexes.at(i);
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changePersistentIndex(m_proxyIndexes.at(i), index(
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p.row(), p.column(), p.parent()));
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}
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m_layoutChangePersistentIndexes.clear();
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m_proxyIndexes.clear();
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emit layoutChanged();
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}
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void MovableModel::desyncedSourceDataChanged(const QModelIndex& topLeft,
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const QModelIndex& bottomRight,
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const QVector<int>& roles)
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{
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Q_UNUSED(topLeft)
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Q_UNUSED(bottomRight)
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emit dataChanged(index(0), index(rowCount() - 1), roles);
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}
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void MovableModel::sourceRowsInserted(const QModelIndex& parent, int first,
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int last)
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{
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Q_ASSERT(!parent.isValid());
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beginInsertRows({}, first, last);
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int oldCount = m_indexes.size();
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int insertCount = last - first + 1;
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m_indexes.reserve(m_indexes.size() + insertCount);
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for (auto i = first; i <= last; i++)
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m_indexes.emplace_back(m_sourceModel->index(i, 0));
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std::rotate(m_indexes.begin() + first, m_indexes.begin() + oldCount,
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m_indexes.end());
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endInsertRows();
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}
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void MovableModel::sourceRowsAboutToBeRemoved(const QModelIndex& parent,
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int first, int last)
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{
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Q_ASSERT(!parent.isValid());
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Q_ASSERT(!m_synced);
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std::vector<int> indicesToRemove;
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indicesToRemove.reserve(last - first + 1);
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for (auto i = 0; i < m_indexes.size(); i++) {
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const QPersistentModelIndex& idx = m_indexes.at(i);
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if (idx.row() >= first && idx.row() <= last)
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indicesToRemove.push_back(i);
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}
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if (indicesToRemove.empty())
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return;
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std::vector<std::pair<int, int>> sequences;
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auto sequenceBegin = indicesToRemove.front();
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auto sequenceEnd = sequenceBegin;
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for (auto i = 1; i < indicesToRemove.size(); i++) {
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auto idxToRemove = indicesToRemove[i];
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auto idxDiff = idxToRemove - sequenceEnd;
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if (idxDiff == 1)
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sequenceEnd = idxToRemove;
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if (idxDiff != 1 || i == indicesToRemove.size() - 1) {
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sequences.emplace_back(sequenceBegin, sequenceEnd);
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sequenceBegin = idxToRemove;
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sequenceEnd = idxToRemove;
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}
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}
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if (sequences.empty())
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sequences.emplace_back(sequenceBegin, sequenceEnd);
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auto end = sequences.crend();
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for (auto it = sequences.crbegin(); it != end; it++) {
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beginRemoveRows({}, it->first, it->second);
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m_indexes.erase(m_indexes.begin() + it->first,
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m_indexes.begin() + it->second + 1);
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endRemoveRows();
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}
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}
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void MovableModel::connectSignalsForSyncedState()
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{
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if (m_sourceModel == nullptr)
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return;
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connect(m_sourceModel, &QAbstractItemModel::rowsAboutToBeInserted, this,
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&MovableModel::beginInsertRows);
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connect(m_sourceModel, &QAbstractItemModel::rowsInserted, this,
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&MovableModel::endInsertRows);
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connect(m_sourceModel, &QAbstractItemModel::rowsAboutToBeRemoved, this,
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&MovableModel::beginRemoveRows);
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connect(m_sourceModel, &QAbstractItemModel::rowsRemoved, this,
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&MovableModel::endRemoveRows);
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connect(m_sourceModel, &QAbstractItemModel::rowsAboutToBeMoved, this,
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&MovableModel::beginMoveRows);
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connect(m_sourceModel, &QAbstractItemModel::rowsMoved, this,
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&MovableModel::endMoveRows);
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connect(m_sourceModel, &QAbstractItemModel::dataChanged, this,
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&MovableModel::syncedSourceDataChanged);
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connect(m_sourceModel, &QAbstractItemModel::layoutAboutToBeChanged, this,
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&MovableModel::sourceLayoutAboutToBeChanged);
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connect(m_sourceModel, &QAbstractItemModel::layoutChanged, this,
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&MovableModel::sourceLayoutChanged);
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connect(m_sourceModel, &QAbstractItemModel::modelAboutToBeReset, this,
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&MovableModel::beginResetModel);
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connect(m_sourceModel, &QAbstractItemModel::modelReset, this,
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&MovableModel::endResetModel);
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disconnect(m_sourceModel, &QAbstractItemModel::dataChanged, this,
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&MovableModel::desyncedSourceDataChanged);
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disconnect(m_sourceModel, &QAbstractItemModel::rowsInserted, this,
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&MovableModel::sourceRowsInserted);
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disconnect(m_sourceModel, &QAbstractItemModel::rowsAboutToBeRemoved, this,
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&MovableModel::sourceRowsAboutToBeRemoved);
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}
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