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/*

  model.cpp

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

*/

#include "model.h"

/*!

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

    in the model.

*/

//! [0]

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

{

    return stringList.count();

}

//! [0]

#ifdef 0

// This represents a read-only version of data(), an early stage in the 

// development of the example leading to an editable StringListModel.

/*!

    Returns an appropriate value for the requested data.

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

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

    string to be returned.

*/

//! [1-data-read-only]

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

{

    if (!index.isValid())

        return QVariant();

    if (index.row() >= stringList.size())

        return QVariant();

    if (role == Qt::DisplayRole)

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

    else

        return QVariant();

}

//! [1-data-read-only]

#endif

/*!

    Returns an appropriate value for the requested data.

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

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

    string to be returned.

*/

//! [1]

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

{

    if (!index.isValid())

        return QVariant();

    if (index.row() >= stringList.size())

        return QVariant();

    if (role == Qt::DisplayRole || role == Qt::EditRole)

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

    else

        return QVariant();

}

//! [1]

/*!

    Returns the appropriate header string depending on the orientation of

    the header and the section. If anything other than the display role is

    requested, we return an invalid variant.

*/

//! [2]

QVariant StringListModel::headerData(int section, Qt::Orientation orientation,

                                     int role) const

{

    if (role != Qt::DisplayRole)

        return QVariant();

    if (orientation == Qt::Horizontal)

        return QString("Column %1").arg(section);

    else

        return QString("Row %1").arg(section);

}

//! [2]

/*!

    Returns an appropriate value for the item's flags. Valid items are

    enabled, selectable, and editable.

*/

//! [3]

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

{

    if (!index.isValid())

        return Qt::ItemIsEnabled;

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

}

//! [3]

/*!

    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.

*/

//! [4]

bool StringListModel::setData(const QModelIndex &index,

                              const QVariant &value, int role)

{

    if (index.isValid() && role == Qt::EditRole) {

        stringList.replace(index.row(), value.toString());

        emit dataChanged(index, index);

        return true;

    }

//! [4] //! [5]

    return false;

}

//! [5]

/*!

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

*/

//! [6]

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

{

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

    for (int row = 0; row < rows; ++row) {

        stringList.insert(position, "");

    }

    endInsertRows();

    return true;

//! [6] //! [7]

}

//! [7]

/*!

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

*/

//! [8]

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

{

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

    for (int row = 0; row < rows; ++row) {

        stringList.removeAt(position);

    }

    endRemoveRows();

    return true;

//! [8] //! [9]

}

//! [9]