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    41 

    42 /*

    43   model.cpp

    44 

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

    46 */

    47 

    48 #include "model.h"

    49 

    50 /*!

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

    52     in the model.

    53 */

    54 

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

    56 {

    57     Q_USING(parent);

    58 

    59     return values.count();

    60 }

    61 

    62 /*

    63     Returns an appropriate value for the requested data.

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

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

    66     depending on the orientation of the header.

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

    68     string to be returned.

    69 */

    70 

    71 /*!

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

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

    74     is ignored.

    75 */

    76 

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

    78 {

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

    80         && column == 0)

    81         return createIndex(row, column, 0);

    82     else

    83         return QModelIndex();

    84 }

    85 

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

    87 {

    88     Q_UNUSED(role);

    89 

    90     if (!index.isValid())

    91         return QVariant();

    92 

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

    94 }

    95 

    96 /*!

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

    98 */

    99 

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

   101 {

   102     // all items in the model are editable

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

   104 }

   105 

   106 /*!

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

   108     are met:

   109 

   110     * The index supplied is valid.

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

   112     * The role associated with editing text is specified.

   113 

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

   115 */

   116 

   117 bool LinearModel::setData(const QModelIndex &index,

   118                           const QVariant &value, int role)

   119 {

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

   121         return false;

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

   123     emit dataChanged(index, index);

   124     return true;

   125 }

   126 

   127 /*!

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

   129 */

   130 

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

   132 {

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

   134 

   135     values.insert(position, rows, 0);

   136 

   137     endInsertRows();

   138     return true;

   139 }

   140 

   141 /*!

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

   143 */

   144 

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

   146 {

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

   148 

   149     values.remove(position, rows);

   150 

   151     endRemoveRows();

   152     return true;

   153 }