Long live Qt 4.5!

7 files changed, 881 insertions, 0 deletions

diff --git a/doc/src/snippets/modelview-subclasses/main.cpp b/doc/src/snippets/modelview-subclasses/main.cpp
new file mode 100644
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--- /dev/null
+++ b/doc/src/snippets/modelview-subclasses/main.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*
+    main.cpp
+
+    An example of a main window application that used a subclassed model
+    and view to display data from sound files.
+*/
+
+#include <QApplication>
+
+#include "model.h"
+#include "view.h"
+#include "window.h"
+
+/*!
+    The main function for the linear model example. This creates and
+    populates a model with long integers then displays the contents of the
+    model using a QListView widget.
+*/
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+
+    MainWindow *window = new MainWindow;
+
+    window->show();
+    return app.exec();
+}
diff --git a/doc/src/snippets/modelview-subclasses/model.cpp b/doc/src/snippets/modelview-subclasses/model.cpp
new file mode 100644
index 0000000..16518c7
--- /dev/null
+++ b/doc/src/snippets/modelview-subclasses/model.cpp
@@ -0,0 +1,153 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*
+  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;
+}
diff --git a/doc/src/snippets/modelview-subclasses/model.h b/doc/src/snippets/modelview-subclasses/model.h
new file mode 100644
index 0000000..7965f49
--- /dev/null
+++ b/doc/src/snippets/modelview-subclasses/model.h
@@ -0,0 +1,71 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef MODEL_H
+#define MODEL_H
+
+#include <QAbstractListModel>
+#include <QObject>
+#include <qvector.h>
+
+class LinearModel : public QAbstractListModel
+{
+    Q_OBJECT
+public:
+    LinearModel(QObject *parent = 0)
+        : QAbstractListModel(parent) {}
+
+    int rowCount(const QModelIndex &parent = QModelIndex()) const;
+    QModelIndex index(int row, int column = 0, const QModelIndex &parent = QModelIndex()) const;
+    QVariant data(const QModelIndex &index, int role) const;
+
+    Qt::ItemFlags flags(const QModelIndex &index) const;
+    bool setData(const QModelIndex &index, const QVariant &value,
+                 int role = Qt::EditRole);
+
+    bool insertRows(int position, int rows, const QModelIndex &index = QModelIndex());
+    bool removeRows(int position, int rows, const QModelIndex &index = QModelIndex());
+
+private:
+    QVector<int> values;
+};
+
+#endif
diff --git a/doc/src/snippets/modelview-subclasses/view.cpp b/doc/src/snippets/modelview-subclasses/view.cpp
new file mode 100644
index 0000000..7d683ea
--- /dev/null
+++ b/doc/src/snippets/modelview-subclasses/view.cpp
@@ -0,0 +1,315 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*!
+    view.cpp
+
+    Provides a view to represent a one-dimensional sequence of integers
+    obtained from a list model as a series of rows.
+*/
+
+#include <QAbstractItemModel>
+#include <QBrush>
+#include <QItemSelection>
+#include <QPainter>
+#include <QPaintEvent>
+#include <QPen>
+#include <QPoint>
+#include <QResizeEvent>
+#include <QScrollBar>
+#include <QSizePolicy>
+
+#include "view.h"
+
+LinearView::LinearView(QWidget *parent)
+    : QAbstractItemView(parent)
+{
+    setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
+}
+
+/*!
+    Returns the position of the item in viewport coordinates.
+*/
+
+QRect LinearView::itemViewportRect(const QModelIndex &index) const
+{
+    QRect rect = itemRect(index);
+    QRect result(rect.left() - horizontalScrollBar()->value(),
+                 rect.top() - verticalScrollBar()->value(),
+                 rect.width(), viewport()->height());
+
+    return result;
+}
+
+/*!
+    Returns the rectangle of the item at position \a index in the
+    model. The rectangle is in contents coordinates.
+*/
+
+QRect LinearView::itemRect(const QModelIndex &index) const
+{
+    if (!index.isValid())
+        return QRect();
+    else
+        return QRect(index.row(), 0, 1, 1);
+}
+
+
+void LinearView::ensureVisible(const QModelIndex &index)
+{
+    QRect area = viewport()->rect();
+    QRect rect = itemViewportRect(index);
+
+    if (rect.left() < area.left())
+        horizontalScrollBar()->setValue(
+            horizontalScrollBar()->value() - rect.left());
+    else if (rect.right() > area.right())
+        horizontalScrollBar()->setValue(
+            horizontalScrollBar()->value() + rect.left() - area.width());
+}
+
+/*!
+    Returns the item that covers the coordinate given in the view.
+*/
+
+QModelIndex LinearView::itemAt(int x, int /* y */) const
+{
+    int row = x + horizontalScrollBar()->value();
+
+    return model()->index(row, 0, QModelIndex());
+}
+
+//void LinearView::dataChanged(const QModelIndex &/* topLeft */,
+//    const QModelIndex &/* bottomRight */)
+//{
+//    updateGeometries();
+//    if (isVisible())
+//        repaint();
+//}
+
+void LinearView::rowsInserted(const QModelIndex &/* parent */, int /* start */,
+    int /* end */)
+{
+    updateGeometries();
+    if (isVisible())
+        repaint();
+}
+
+void LinearView::rowsRemoved(const QModelIndex &/* parent */, int /* start */,
+    int /* end */)
+{
+    updateGeometries();
+    if (isVisible())
+        repaint();
+}
+/*
+void LinearView::verticalScrollbarAction(int action)
+{
+}
+
+void LinearView::horizontalScrollbarAction(int action)
+{
+}
+*/
+
+/*!
+    Select the items in the model that lie within the rectangle specified by
+    \a rect, using the selection \a command.
+*/
+
+void LinearView::setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags command)
+{
+    QModelIndex leftIndex = itemAt(rect.left(), 0);
+    QModelIndex rightIndex = itemAt(rect.right(), 0);
+
+    QItemSelection selection(leftIndex, rightIndex);
+
+    selectionModel()->select(selection, command);
+}
+
+QModelIndex LinearView::moveCursor(QAbstractItemView::CursorAction cursorAction,
+                                   Qt::KeyboardModifiers)
+{
+    QModelIndex current = currentIndex();
+
+    switch (cursorAction) {
+    case MoveLeft:{
+        if (current.row() > 0)
+            return model()->index(current.row() - 1, 0, QModelIndex());
+        else
+            return model()->index(0, 0, QModelIndex());
+        break;}
+    case MoveRight:{
+        if (current.row() < rows(current) - 1)
+            return model()->index(current.row() + 1, 0, QModelIndex());
+        else
+            return model()->index(rows(current) - 1, 0,QModelIndex());
+        break;}
+    case MoveUp:
+        return current;
+    case MoveDown:
+        return current;
+    case MovePageUp:
+        return current;
+    case MovePageDown:
+        return current;
+    case MoveHome:
+        return model()->index(0, 0, QModelIndex());
+    case MoveEnd:
+        return model()->index(rows(current) - 1, 0, QModelIndex());
+    default:
+        return current;
+    }
+}
+
+int LinearView::horizontalOffset() const
+{
+    return horizontalScrollBar()->value();
+}
+
+int LinearView::verticalOffset() const
+{
+    return verticalScrollBar()->value();
+}
+
+/*!
+    Returns a rectangle corresponding to the selection in viewport cooridinates.
+*/
+
+QRect LinearView::selectionViewportRect(const QItemSelection &selection) const
+{
+    int ranges = selection.count();
+
+    if (ranges == 0)
+        return QRect();
+
+    // Note that we use the top and bottom functions of the selection range
+    // since the data is stored in rows.
+
+    int firstRow = selection.at(0).top();
+    int lastRow = selection.at(0).top();
+
+    for (int i = 0; i < ranges; ++i) {
+        firstRow = qMin(firstRow, selection.at(i).top());
+        lastRow = qMax(lastRow, selection.at(i).bottom());
+    }
+
+    QModelIndex firstItem = model()->index(qMin(firstRow, lastRow), 0,
+        QModelIndex());
+    QModelIndex lastItem = model()->index(qMax(firstRow, lastRow), 0,
+        QModelIndex());
+
+    QRect firstRect = itemViewportRect(firstItem);
+    QRect lastRect = itemViewportRect(lastItem);
+
+    return QRect(firstRect.left(), firstRect.top(),
+        lastRect.right() - firstRect.left(), firstRect.height());
+}
+
+void LinearView::paintEvent(QPaintEvent *event)
+{
+    QPainter painter(viewport());
+
+    QRect updateRect = event->rect();
+    QBrush background(Qt::black);
+    QPen foreground(Qt::white);
+
+    painter.fillRect(updateRect, background);
+    painter.setPen(foreground);
+
+    QModelIndex firstItem = itemAt(updateRect.left(), updateRect.top());
+    if (!firstItem.isValid())
+        firstItem = model()->index(0, 0, QModelIndex());
+
+    QModelIndex lastItem = itemAt(updateRect.right(), updateRect.bottom());
+    if (!lastItem.isValid())
+        lastItem = model()->index(rows() - 1, 0, QModelIndex());
+
+    int x = updateRect.left();
+    //int top = updateRect.top();
+    //int bottom = updateRect.bottom();
+
+    int row = firstItem.row();
+    QModelIndex index = model()->index(row, 0, QModelIndex());
+    int value = model()->data(index, Qt::DisplayRole).toInt();
+    int midPoint = viewport()->height()/2;
+    int y2 = midPoint - int(value * midPoint/255.0);
+
+    while (row <= lastItem.row()) {
+
+        QModelIndex index = model()->index(row, 0, QModelIndex());
+        int value = model()->data(index, Qt::DisplayRole).toInt();
+
+        int y1 = y2;
+        y2 = midPoint - int(value * midPoint/255.0);
+
+        painter.drawLine(x-1, y1, x, y2);
+        ++row; ++x;
+    }
+}
+
+void LinearView::resizeEvent(QResizeEvent * /* event */)
+{
+    updateGeometries();
+}
+
+void LinearView::updateGeometries()
+{
+    if (viewport()->width() < rows()) {
+        horizontalScrollBar()->setPageStep(viewport()->width());
+        horizontalScrollBar()->setRange(0, rows() - viewport()->width() - 1);
+    }
+}
+
+QSize LinearView::sizeHint() const
+{
+    return QSize(rows(), 200);
+}
+
+int LinearView::rows(const QModelIndex &index) const
+{
+    return model()->rowCount(model()->parent(index));
+}
+
+bool LinearView::isIndexHidden(const QModelIndex &index) const
+{
+    return false;
+}
diff --git a/doc/src/snippets/modelview-subclasses/view.h b/doc/src/snippets/modelview-subclasses/view.h
new file mode 100644
index 0000000..d6d64bb
--- /dev/null
+++ b/doc/src/snippets/modelview-subclasses/view.h
@@ -0,0 +1,91 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef VIEW_H
+#define VIEW_H
+
+#include <QAbstractItemView>
+#include <QItemSelection>
+#include <QItemSelectionModel>
+#include <QModelIndex>
+#include <QRect>
+#include <QSize>
+#include <QWidget>
+
+class LinearView : public QAbstractItemView
+{
+    Q_OBJECT
+public:
+    LinearView(QWidget *parent = 0);
+
+    QRect itemViewportRect(const QModelIndex &index) const;
+    void ensureVisible(const QModelIndex &index);
+    QModelIndex itemAt(int x, int y) const;
+
+protected slots:
+    /*void dataChanged(const QModelIndex &topLeft, const QModelIndex
+    &bottomRight);*/
+    void rowsInserted(const QModelIndex &parent, int start, int end);
+    void rowsRemoved(const QModelIndex &parent, int start, int end);
+    /*void selectionChanged(const QItemSelection &deselected, const QItemSelection &selected);
+    void verticalScrollbarAction(int action);
+    void horizontalScrollbarAction(int action);*/
+
+protected:
+    void setSelection(const QRect&, QItemSelectionModel::SelectionFlags command);
+    QRect selectionViewportRect(const QItemSelection &selection) const;
+    QRect itemRect(const QModelIndex &item) const;
+    bool isIndexHidden(const QModelIndex &index) const;
+    int horizontalOffset() const;
+    int verticalOffset() const;
+    QModelIndex moveCursor(QAbstractItemView::CursorAction cursorAction,
+                           Qt::KeyboardModifiers modifiers);
+
+    void paintEvent(QPaintEvent *event);
+    void resizeEvent(QResizeEvent *event);
+    QSize sizeHint() const;
+
+private:
+    int rows(const QModelIndex &index = QModelIndex()) const;
+    void updateGeometries();
+};
+
+#endif
diff --git a/doc/src/snippets/modelview-subclasses/window.cpp b/doc/src/snippets/modelview-subclasses/window.cpp
new file mode 100644
index 0000000..d87857d
--- /dev/null
+++ b/doc/src/snippets/modelview-subclasses/window.cpp
@@ -0,0 +1,113 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QAction>
+#include <QDataStream>
+#include <QMenu>
+#include <QMenuBar>
+#include <QFile>
+#include <QFileDialog>
+#include <QListView>
+
+#include "window.h"
+
+MainWindow::MainWindow(QWidget *parent)
+    : QMainWindow(parent)
+{
+    setWindowTitle("Model/View example");
+
+    setupModelView();
+
+    QAction *openAction = new QAction(tr("&Open"), this);
+    QAction *quitAction = new QAction(tr("E&xit"), this);
+    QMenu *fileMenu = new QMenu(tr("&File"), this);
+    fileMenu->addAction(openAction);
+    fileMenu->addAction(quitAction);
+    menuBar()->addMenu(fileMenu);
+
+    connect(openAction, SIGNAL(triggered()), this, SLOT(selectOpenFile()));
+    connect(quitAction, SIGNAL(triggered()), this, SLOT(close()));
+
+    setCentralWidget(view);
+}
+
+void MainWindow::setupModelView()
+{
+    model = new LinearModel(this);
+    view = new LinearView(this);
+    view->setModel(model);
+}
+
+void MainWindow::selectOpenFile()
+{
+    QString fileName = QFileDialog::getOpenFileName(this,
+        tr("Select a file to open"), "", tr("Sound files (*.wav)"));
+    
+    if (!fileName.isEmpty())
+        openFile(fileName);
+}
+
+void MainWindow::openFile(const QString &fileName)
+{
+    QFile file(fileName);
+    int length = file.size();
+
+    if (file.open(QFile::ReadOnly)) {
+        model->removeRows(0, model->rowCount());
+
+        int rows = (length - 0x2c)/2;
+        model->insertRows(0, rows);
+
+        // Perform some dodgy tricks to extract the data from the file.
+        QDataStream stream(&file);
+        stream.setByteOrder(QDataStream::LittleEndian);
+
+        Q_INT16 left;
+        Q_INT16 right;
+
+        for (int row = 0; row < rows; ++row) {
+            QModelIndex index = model->index(row);
+
+            stream >> left >> right;
+            model->setData(index, int(left / 256));
+        }
+    }
+}
diff --git a/doc/src/snippets/modelview-subclasses/window.h b/doc/src/snippets/modelview-subclasses/window.h
new file mode 100644
index 0000000..b4cead0
--- /dev/null
+++ b/doc/src/snippets/modelview-subclasses/window.h
@@ -0,0 +1,69 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef WINDOW_H
+#define WINDOW_H
+
+#include <QMainWindow>
+#include <QString>
+#include <QWidget>
+
+#include "model.h"
+#include "view.h"
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+public:
+    MainWindow::MainWindow(QWidget *parent = 0);
+
+public slots:
+    void selectOpenFile();
+
+private:
+    void setupModelView();
+    void openFile(const QString &fileName);
+
+    LinearModel *model;
+    LinearView *view;
+};
+
+#endif