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/*

  model.cpp

  A simple model that uses a QVector as its data source.

*/

#include "model.h"

/*!

    Returns the number of items in the string list as the number of rows

    in the model.

*/

int LinearModel::rowCount(const QModelIndex &parent) const

{

    Q_USING(parent);

    return values.count();

}

/*

    Returns an appropriate value for the requested data.

    If the view requests an invalid index, an invalid variant is returned.

    If a header is requested then we just return the column or row number,

    depending on the orientation of the header.

    Any valid index that corresponds to a string in the list causes that

    string to be returned.

*/

/*!

    Returns a model index for other component to use when referencing the

    item specified by the given row, column, and type. The parent index

    is ignored.

*/

QModelIndex LinearModel::index(int row, int column, const QModelIndex &parent) const

{

    if (parent == QModelIndex() && row >= 0 && row < rowCount()

        && column == 0)

        return createIndex(row, column, 0);

    else

        return QModelIndex();

}

QVariant LinearModel::data(const QModelIndex &index, int role) const

{

    Q_UNUSED(role);

    if (!index.isValid())

        return QVariant();

    return values.at(index.row());

}

/*!

    Returns Qt::ItemIsEditable so that all items in the vector can be edited.

*/

Qt::ItemFlags LinearModel::flags(const QModelIndex &index) const

{

    // all items in the model are editable

    return QAbstractListModel::flags(index) | Qt::ItemIsEditable;

}

/*!

    Changes an item in the string list, but only if the following conditions

    are met:

    * The index supplied is valid.

    * The index corresponds to an item to be shown in a view.

    * The role associated with editing text is specified.

    The dataChanged() signal is emitted if the item is changed.

*/

bool LinearModel::setData(const QModelIndex &index,

                          const QVariant &value, int role)

{

    if (!index.isValid() || role != Qt::EditRole)

        return false;

    values.replace(index.row(), value.toInt());

    emit dataChanged(index, index);

    return true;

}

/*!

    Inserts a number of rows into the model at the specified position.

*/

bool LinearModel::insertRows(int position, int rows, const QModelIndex &parent)

{

    beginInsertRows(parent, position, position + rows - 1);

    values.insert(position, rows, 0);

    endInsertRows();

    return true;

}

/*!

    Removes a number of rows from the model at the specified position.

*/

bool LinearModel::removeRows(int position, int rows, const QModelIndex &parent)

{

    beginRemoveRows(QModelIndex(), position, position+rows-1);

    values.remove(position, rows);

    endRemoveRows();

    return true;

}