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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. |
| */ |
| |
| int StringListModel::rowCount(const QModelIndex &parent) const |
| { |
| return stringList.count(); |
| } |
| |
| /*! |
| 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. |
| */ |
| |
| 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(); |
| } |
| |
| /*! |
| 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. |
| */ |
| |
| 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); |
| } |
| |
| /*! |
| Returns an appropriate value for the item's flags. Valid items are |
| enabled, selectable, and editable. |
| */ |
| |
| Qt::ItemFlags StringListModel::flags(const QModelIndex &index) const |
| { |
| if (!index.isValid()) |
| return Qt::ItemIsEnabled; |
| |
| return QAbstractItemModel::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 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; |
| } |
| return false; |
| } |
| |
| /*! |
| Inserts a number of rows into the model at the specified position. |
| */ |
| |
| 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; |
| } |
| |
| /*! |
| Removes a number of rows from the model at the specified position. |
| */ |
| |
| 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; |
| } |