C++ endMoveRows函数代码示例

bool LauncherModel::moveRows(const QModelIndex &sourceParent, int sourceRow, int count,
                             const QModelIndex &destinationParent, int destinationChild)
{
    QList<Application *> tmp;

    Q_UNUSED(sourceParent);
    Q_UNUSED(destinationParent);

    if (sourceRow + count - 1 < destinationChild) {
        beginMoveRows(QModelIndex(), sourceRow, sourceRow + count - 1, QModelIndex(),
                      destinationChild + 1);
        for (int i = sourceRow; i < sourceRow + count; i++) {
            Q_ASSERT(m_list[i]);
            tmp << m_list.takeAt(i);
        }
        for (int i = 0; i < count; i++) {
            Q_ASSERT(tmp[i]);
            m_list.insert(destinationChild - count + 2 + i, tmp[i]);
        }
        endMoveRows();
    } else if (sourceRow > destinationChild) {
        beginMoveRows(QModelIndex(), sourceRow, sourceRow + count - 1, QModelIndex(),
                      destinationChild);
        for (int i = sourceRow; i < sourceRow + count; i++) {
            Q_ASSERT(m_list[i]);
            tmp << m_list.takeAt(i);
        }
        for (int i = 0; i < count; i++) {
            Q_ASSERT(tmp[i]);
            m_list.insert(destinationChild + i, tmp[i]);
        }
        endMoveRows();
    }
    return true;
}

QModelIndex ListModel::moveItemHorizontal(const QModelIndex& index, int direction)
{
    ListItem* item = itemFromIndex(index);
    if (!item)
        return index;

    ListItem* parent = item->parent();
    int row = item->row();

    if (direction == App::Left) { // reparent as child of parent's parent
        if (!parent || parent->isRoot()) // already top level item
            return index;

        ListItem* newParent = parent->parent();
        int newRow = parent->row() + 1;

        QSqlDatabase db = QSqlDatabase::database();
        db.transaction();
        if (parent->takeChildDb(row) &&
            item->setParentDb(newParent, newRow)) {
            db.commit();
            if (beginMoveRows(indexFromItem(parent), row, row, indexFromItem(newParent), newRow)) {
                newParent->insertChild(newRow, parent->takeChild(row));
                endMoveRows();
            }
            return indexFromItem(item);
        } else {
            db.rollback();
            return index;
        }
    } else { // move as child of previous sibling
        ListItem* newParent = parent->child(row - 1);
        if (!newParent)
            return index;

        QSqlDatabase db = QSqlDatabase::database();
        db.transaction();
        if (parent->takeChildDb(row) &&
            item->setParentDb(newParent, newParent->childCount())) {
            db.commit();
            if (beginMoveRows(indexFromItem(parent), row, row, indexFromItem(newParent), newParent->childCount())) {
                newParent->appendChild(parent->takeChild(row));
                endMoveRows();
            }
            newParent->setExpanded(true);
            return indexFromItem(item);
        } else {
            db.rollback();
            return index;
        }
    }
}

void RSSModel::itemPathChanged(RSS::Item *rssItem)
{
    const auto itemIndex = index(rssItem);
    const auto parentIndex = itemIndex.parent();
    beginMoveRows(itemIndex.parent(), itemIndex.row(), itemIndex.row(), parentIndex, 0);
    endMoveRows();
}

void RecentProjectsModel::setLastRecentProject(const FilePath& filepath)
{
    // if the filepath is already in the list, we just have to move it to the top of the list
    for (int i = 0; i < mRecentProjects.count(); i++)
    {
        if (mRecentProjects.at(i).toStr() == filepath.toStr())
        {
            if (i == 0)
                return; // the filename is already on top of the list, so nothing to do here...

            beginMoveRows(QModelIndex(), i, i, QModelIndex(), 0);
            mRecentProjects.move(i, 0);
            endMoveRows();
            save();
            return;
        }
    }

    // limit the maximum count of entries in the list
    while (mRecentProjects.count() >= 5)
    {
        beginRemoveRows(QModelIndex(), mRecentProjects.count()-1, mRecentProjects.count()-1);
        mRecentProjects.takeLast();
        endRemoveRows();
    }

    // add the new filepath to the list
    beginInsertRows(QModelIndex(), 0, 0);
    mRecentProjects.prepend(filepath);
    endInsertRows();
    save();
}

void ClipboardModel::sortItems(const QModelIndexList &indexList, CompareItems *compare)
{
    QList<QPersistentModelIndex> list = validIndeces(indexList);
    qSort( list.begin(), list.end(), compare );

    int targetRow = topMostRow(list);

    foreach (const QPersistentModelIndex &ind, list) {
        if (ind.isValid()) {
            const int sourceRow = ind.row();

            if (targetRow != sourceRow) {
                beginMoveRows(QModelIndex(), sourceRow, sourceRow, QModelIndex(), targetRow);
                m_clipboardList.move(sourceRow, targetRow);
                endMoveRows();

                // If the moved item was removed or moved further (as reaction on moving the item),
                // stop sorting.
                if (!ind.isValid() || ind.row() != targetRow)
                    break;
            }

            ++targetRow;
        }
    }
}

void Timeline::
privMoveObject(int source, int dest)
{
  QModelIndex parent;

  /* FIXME: currently ignoring the 'n' parameter */
  /* FIXME: there's something I don't understand about the API,
     because it seems to be impossible to increment an item's position
     by one. So if the destination is one greater than the source,
     swap dest and source. It seems to work fine.
  */

  if (dest == (source + 1))
  {
    swap(source, dest);
  }

  qDebug() << source << dest;
  if (!beginMoveRows(parent, source, source, parent, dest))
  {
    qDebug() << "early exit";
    return;
  }
  endMoveRows();
}

bool CategoryModel::dropMimeData(const QMimeData* data, Qt::DropAction action, int row, int column, const QModelIndex& parent) {
    if (action == Qt::IgnoreAction)
        return true;

    if (!data->hasFormat("application/editor.categorymodel.index"))
        return false;

    QByteArray encodedData = data->data("application/editor.categorymodel.index");
    QDataStream stream(&encodedData, QIODevice::ReadOnly);

    QList<Item*> items;

    while (!stream.atEnd()) {
        quint64 address;
        stream >> address;
        Item* item = reinterpret_cast<Item*>(address);
        items.push_back(item);
    }

    Category* category = static_cast<Category*>(parent.internalPointer());

    for (QList<Item*>::const_iterator it = items.begin(); it != items.end(); ++it) {
        Item* item = *it;
        if (!item->isCategory() || !item->toCategory()->isAncestorOf(category)) {
            QModelIndex parentIndex = createIndex(item->parent()->childNumber(), 1, item->parent());
            if (parentIndex != parent) {
                beginMoveRows(parentIndex, item->childNumber(), item->childNumber(), parent, rowCount(parent));
                category->addChild(item);
                endMoveRows();
            }
        }
    }

    return true;
}

Q_INVOKABLE void ApplicationListModel::moveItem(int row, int destination)
{
    if (row < 0 || destination < 0 || row >= m_applicationList.length() ||
        destination >= m_applicationList.length() || row == destination) {
        return;
    }
    if (destination > row) {
        ++destination;
    }

    beginMoveRows(QModelIndex(), row, row, QModelIndex(), destination);
    if (destination > row) {
        ApplicationData data = m_applicationList.at(row);
        m_applicationList.insert(destination, data);
        m_applicationList.takeAt(row);
    } else {
        ApplicationData data = m_applicationList.takeAt(row);
        m_applicationList.insert(destination, data);
    }


    m_appOrder.clear();
    m_appPositions.clear();
    int i = 0;
    for (auto app : m_applicationList) {
        m_appOrder << app.storageId;
        m_appPositions[app.storageId] = i;
        ++i;
    }


    emit appOrderChanged();
    endMoveRows();
}

bool QgsComposerModel::reorderItemToBottom( QgsComposerItem *item )
{
  if ( !item || !mItemsInScene.contains( item ) )
  {
    return false;
  }

  if ( mItemsInScene.last() == item )
  {
    //item is already lowest item present in scene, nothing to do
    return false;
  }

  //move item in z list
  QMutableListIterator<QgsComposerItem *> it( mItemZList );
  if ( it.findNext( item ) )
  {
    it.remove();
  }
  mItemZList.push_back( item );

  //also move item in scene items z list and notify of model changes
  QModelIndex itemIndex = indexForItem( item );
  if ( !itemIndex.isValid() )
  {
    return true;
  }

  //move item to bottom
  int row = itemIndex.row();
  beginMoveRows( QModelIndex(), row, row, QModelIndex(), rowCount() );
  refreshItemsInScene();
  endMoveRows();
  return true;
}

bool CellModel::moveRows(const QModelIndex &sourceParent, int sourceRow, int count, const QModelIndex &destinationParent, int destinationChild)
{
    Cell* srcCell;
    Cell* desCell;
    bool result = true;

    if (!sourceParent.isValid())
        srcCell = topCell;
    else
        srcCell = getCellByIndex(sourceParent);

    if (!destinationParent.isValid())
        desCell = topCell;
    else
        desCell = getCellByIndex(destinationParent);

    if (sourceRow+count-1 > srcCell->childCount() || destinationChild > desCell->childCount())
        return false;

    beginMoveRows(sourceParent,sourceRow,sourceRow+count-1,destinationParent,destinationChild);
        for (int i=0; i<count; i++){
            result &= desCell->insertChildren(destinationChild,1,srcCell->getChild(sourceRow));
            result &= srcCell->removeChildren(sourceRow,1,false);
        }
    endMoveRows();

    return result;
}

bool SceneFilter::moveRows(const QModelIndex &sourceParent, int sourceRow,
                           int count, const QModelIndex &destinationParent,
                           int destinationChild)
{
    beginMoveRows(sourceParent, sourceRow, sourceRow+(count-1), destinationParent,
                  destinationChild);

    endMoveRows();
}

void PagedProxyModel::sourceRowsMoved(const QModelIndex &sourceParent, int sourceStart, int sourceEnd, const QModelIndex &destinationParent, int destinationRow)
{
    const int pageStart = (m_currentPage*m_pageSize);
    int newStart = qMin(m_pageSize, qMax(0, sourceStart - pageStart));
    int newEnd = qMin(m_pageSize, newStart + (sourceEnd - sourceStart));
    int newDestinationRow = qMin(m_pageSize, qMax(0, destinationRow - pageStart));

    emit beginMoveRows(sourceParent, newStart, newEnd, destinationParent, newDestinationRow);
    endMoveRows();
}

void IOSignalModel::down(int index)
{
    if(index < 0 || index >= (mIOSignals.count() - 1))
        return;

    beginMoveRows(QModelIndex(), index + 1, index + 1, QModelIndex(), index);
    IOSignal *sig = mIOSignals.at(index);
    mIOSignals[index] = mIOSignals.at(index + 1);
    mIOSignals[index + 1] = sig;
    endMoveRows();
}

    void moveRow( int from, int to ) {
        if ( from == to ) return;
        if ( from >= m_tasks.size() || to >= m_tasks.size()+1 ) return;

        if ( beginMoveRows( QModelIndex(), from, from, QModelIndex(), to ) ) {
            m_tasks.move( from, to );
            endMoveRows();
        } else {
            assert( 0 );
        }
    }

/**
 * @brief Moves a direction.
 * @param index Index of the direction to move.
 * @param new_direction_nb The new number of the direction.
 * @throws EditorException in case of error.
 */
void SpriteModel::move_direction(const Index& index, int new_direction_nb) {

  if (new_direction_nb == index.direction_nb) {
    // Nothing to do.
    return;
  }

  // Make some checks first.
  if (!direction_exists(index)) {
      QString nb = std::to_string(index.direction_nb).c_str();
      throw EditorException(
            tr("Direction %1 don't exists in animation '%2'").arg(
              nb, index.animation_name));
  }

  // Save and clear the selection.
  Index selection = get_selected_index();
  clear_selection();

  // Move the direction in the sprite file.
  get_animation(index).move_direction(index.direction_nb, new_direction_nb);

  // Call beginMoveRows() as requested by QAbstractItemModel.
  int above_row = new_direction_nb;
  if (new_direction_nb > index.direction_nb) {
    ++above_row;
  }
  QModelIndex model_index = get_model_index(Index(index.animation_name));
  beginMoveRows(model_index, index.direction_nb, index.direction_nb,
                model_index, above_row);

  // Update our animation model list.
  int animation_nb = get_animation_nb(index);
  animations[animation_nb].directions.move(index.direction_nb, new_direction_nb);

  // Update direction model indexes.
  int num_dir = animations[animation_nb].directions.size();
  for (int nb = 0; nb < num_dir; nb++) {
    animations[animation_nb].directions[nb].index->direction_nb = nb;
  }

  endMoveRows();

  // Notify people before restoring the selection, so that they have a
  // chance to know new indexes before receiving selection signals.
  emit direction_deleted(index);

  // Restore the selection.
  if (selection.direction_nb == index.direction_nb) {
    selection.direction_nb = new_direction_nb;
  }

  set_selected_index(selection);
}