--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/doc/src/snippets/updating-selections/model.cpp Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,237 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*
+ model.cpp
+
+ Provides a table model for use in various examples.
+*/
+
+#include <QtGui>
+
+#include "model.h"
+
+/*!
+ Constructs a table model with at least one row and one column.
+*/
+
+TableModel::TableModel(int rows, int columns, QObject *parent)
+ : QAbstractTableModel(parent)
+{
+ QStringList newList;
+
+ for (int column = 0; column < qMax(1, columns); ++column) {
+ newList.append("");
+ }
+
+ for (int row = 0; row < qMax(1, rows); ++row) {
+ rowList.append(newList);
+ }
+}
+
+
+/*!
+ Returns the number of items in the row list as the number of rows
+ in the model.
+*/
+
+int TableModel::rowCount(const QModelIndex &/*parent*/) const
+{
+ return rowList.size();
+}
+
+/*!
+ Returns the number of items in the first list item as the number of
+ columns in the model. All rows should have the same number of columns.
+*/
+
+int TableModel::columnCount(const QModelIndex &/*parent*/) const
+{
+ return rowList[0].size();
+}
+
+/*!
+ 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 for the display role; otherwise an invalid variant
+ is returned.
+*/
+
+QVariant TableModel::data(const QModelIndex &index, int role) const
+{
+ if (!index.isValid())
+ return QVariant();
+
+ if (role == Qt::DisplayRole)
+ return rowList[index.row()][index.column()];
+ 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 TableModel::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 TableModel::flags(const QModelIndex &index) const
+{
+ if (!index.isValid())
+ return Qt::ItemIsEnabled;
+
+ return Qt::ItemIsEnabled | Qt::ItemIsSelectable | Qt::ItemIsEditable;
+}
+
+/*!
+ Changes an item in the model, but only if the following conditions
+ are met:
+
+ * The index supplied is valid.
+ * The role associated with editing text is specified.
+
+ The dataChanged() signal is emitted if the item is changed.
+*/
+
+bool TableModel::setData(const QModelIndex &index,
+ const QVariant &value, int role)
+{
+ if (!index.isValid() || role != Qt::EditRole)
+ return false;
+
+ rowList[index.row()][index.column()] = value.toString();
+ emit dataChanged(index, index);
+ return true;
+}
+
+/*!
+ Inserts a number of rows into the model at the specified position.
+*/
+
+bool TableModel::insertRows(int position, int rows, const QModelIndex &parent)
+{
+ int columns = columnCount();
+ beginInsertRows(parent, position, position + rows - 1);
+
+ for (int row = 0; row < rows; ++row) {
+ QStringList items;
+ for (int column = 0; column < columns; ++column)
+ items.append("");
+ rowList.insert(position, items);
+ }
+
+ endInsertRows();
+ return true;
+}
+
+/*!
+ Inserts a number of columns into the model at the specified position.
+ Each entry in the list is extended in turn with the required number of
+ empty strings.
+*/
+
+bool TableModel::insertColumns(int position, int columns, const QModelIndex &parent)
+{
+ int rows = rowCount();
+ beginInsertColumns(parent, position, position + columns - 1);
+
+ for (int row = 0; row < rows; ++row) {
+ for (int column = position; column < columns; ++column) {
+ rowList[row].insert(position, "");
+ }
+ }
+
+ endInsertColumns();
+ return true;
+}
+
+/*!
+ Removes a number of rows from the model at the specified position.
+*/
+
+bool TableModel::removeRows(int position, int rows, const QModelIndex &parent)
+{
+ beginRemoveRows(parent, position, position + rows - 1);
+
+ for (int row = 0; row < rows; ++row) {
+ rowList.removeAt(position);
+ }
+
+ endRemoveRows();
+ return true;
+}
+
+/*!
+ Removes a number of columns from the model at the specified position.
+ Each row is shortened by the number of columns specified.
+*/
+
+bool TableModel::removeColumns(int position, int columns, const QModelIndex &parent)
+{
+ int rows = rowCount();
+ beginRemoveColumns(parent, position, position + columns - 1);
+
+ for (int row = 0; row < rows; ++row) {
+ for (int column = 0; column < columns; ++column) {
+ rowList[row].removeAt(position);
+ }
+ }
+
+ endRemoveColumns();
+ return true;
+}