diff -r 000000000000 -r 1918ee327afb examples/tools/settingseditor/settingstree.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/tools/settingseditor/settingstree.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,263 @@
+/****************************************************************************
+**
+** 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 examples 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtGui>
+
+#include "settingstree.h"
+#include "variantdelegate.h"
+
+SettingsTree::SettingsTree(QWidget *parent)
+    : QTreeWidget(parent)
+{
+    setItemDelegate(new VariantDelegate(this));
+
+    QStringList labels;
+    labels << tr("Setting") << tr("Type") << tr("Value");
+    setHeaderLabels(labels);
+    header()->setResizeMode(0, QHeaderView::Stretch);
+    header()->setResizeMode(2, QHeaderView::Stretch);
+
+    settings = 0;
+    refreshTimer.setInterval(2000);
+    autoRefresh = false;
+
+    groupIcon.addPixmap(style()->standardPixmap(QStyle::SP_DirClosedIcon),
+                        QIcon::Normal, QIcon::Off);
+    groupIcon.addPixmap(style()->standardPixmap(QStyle::SP_DirOpenIcon),
+                        QIcon::Normal, QIcon::On);
+    keyIcon.addPixmap(style()->standardPixmap(QStyle::SP_FileIcon));
+
+    connect(&refreshTimer, SIGNAL(timeout()), this, SLOT(maybeRefresh()));
+}
+
+void SettingsTree::setSettingsObject(QSettings *settings)
+{
+    delete this->settings;
+    this->settings = settings;
+    clear();
+
+    if (settings) {
+        settings->setParent(this);
+        refresh();
+        if (autoRefresh)
+            refreshTimer.start();
+    } else {
+        refreshTimer.stop();
+    }
+}
+
+QSize SettingsTree::sizeHint() const
+{
+    return QSize(800, 600);
+}
+
+void SettingsTree::setAutoRefresh(bool autoRefresh)
+{
+    this->autoRefresh = autoRefresh;
+    if (settings) {
+        if (autoRefresh) {
+            maybeRefresh();
+            refreshTimer.start();
+        } else {
+            refreshTimer.stop();
+        }
+    }
+}
+
+void SettingsTree::setFallbacksEnabled(bool enabled)
+{
+    if (settings) {
+        settings->setFallbacksEnabled(enabled);
+        refresh();
+    }
+}
+
+void SettingsTree::maybeRefresh()
+{
+    if (state() != EditingState)
+        refresh();
+}
+
+void SettingsTree::refresh()
+{
+    if (!settings)
+        return;
+
+    disconnect(this, SIGNAL(itemChanged(QTreeWidgetItem *, int)),
+               this, SLOT(updateSetting(QTreeWidgetItem *)));
+
+    settings->sync();
+    updateChildItems(0);
+
+    connect(this, SIGNAL(itemChanged(QTreeWidgetItem *, int)),
+            this, SLOT(updateSetting(QTreeWidgetItem *)));
+}
+
+bool SettingsTree::event(QEvent *event)
+{
+    if (event->type() == QEvent::WindowActivate) {
+        if (isActiveWindow() && autoRefresh)
+            maybeRefresh();
+    }
+    return QTreeWidget::event(event);
+}
+
+void SettingsTree::updateSetting(QTreeWidgetItem *item)
+{
+    QString key = item->text(0);
+    QTreeWidgetItem *ancestor = item->parent();
+    while (ancestor) {
+        key.prepend(ancestor->text(0) + "/");
+        ancestor = ancestor->parent();
+    }
+
+    settings->setValue(key, item->data(2, Qt::UserRole));
+    if (autoRefresh)
+        refresh();
+}
+
+void SettingsTree::updateChildItems(QTreeWidgetItem *parent)
+{
+    int dividerIndex = 0;
+
+    foreach (QString group, settings->childGroups()) {
+        QTreeWidgetItem *child;
+        int childIndex = findChild(parent, group, dividerIndex);
+        if (childIndex != -1) {
+            child = childAt(parent, childIndex);
+            child->setText(1, "");
+            child->setText(2, "");
+            child->setData(2, Qt::UserRole, QVariant());
+            moveItemForward(parent, childIndex, dividerIndex);
+        } else {
+            child = createItem(group, parent, dividerIndex);
+        }
+        child->setIcon(0, groupIcon);
+        ++dividerIndex;
+
+        settings->beginGroup(group);
+        updateChildItems(child);
+        settings->endGroup();
+    }
+
+    foreach (QString key, settings->childKeys()) {
+        QTreeWidgetItem *child;
+        int childIndex = findChild(parent, key, 0);
+
+        if (childIndex == -1 || childIndex >= dividerIndex) {
+            if (childIndex != -1) {
+                child = childAt(parent, childIndex);
+                for (int i = 0; i < child->childCount(); ++i)
+                    delete childAt(child, i);
+                moveItemForward(parent, childIndex, dividerIndex);
+            } else {
+                child = createItem(key, parent, dividerIndex);
+            }
+            child->setIcon(0, keyIcon);
+            ++dividerIndex;
+        } else {
+            child = childAt(parent, childIndex);
+        }
+
+        QVariant value = settings->value(key);
+        if (value.type() == QVariant::Invalid) {
+            child->setText(1, "Invalid");
+        } else {
+            child->setText(1, value.typeName());
+        }
+        child->setText(2, VariantDelegate::displayText(value));
+        child->setData(2, Qt::UserRole, value);
+    }
+
+    while (dividerIndex < childCount(parent))
+        delete childAt(parent, dividerIndex);
+}
+
+QTreeWidgetItem *SettingsTree::createItem(const QString &text,
+                                          QTreeWidgetItem *parent, int index)
+{
+    QTreeWidgetItem *after = 0;
+    if (index != 0)
+        after = childAt(parent, index - 1);
+
+    QTreeWidgetItem *item;
+    if (parent)
+        item = new QTreeWidgetItem(parent, after);
+    else
+        item = new QTreeWidgetItem(this, after);
+
+    item->setText(0, text);
+    item->setFlags(item->flags() | Qt::ItemIsEditable);
+    return item;
+}
+
+QTreeWidgetItem *SettingsTree::childAt(QTreeWidgetItem *parent, int index)
+{
+    if (parent)
+        return parent->child(index);
+    else
+        return topLevelItem(index);
+}
+
+int SettingsTree::childCount(QTreeWidgetItem *parent)
+{
+    if (parent)
+        return parent->childCount();
+    else
+        return topLevelItemCount();
+}
+
+int SettingsTree::findChild(QTreeWidgetItem *parent, const QString &text,
+                            int startIndex)
+{
+    for (int i = startIndex; i < childCount(parent); ++i) {
+        if (childAt(parent, i)->text(0) == text)
+            return i;
+    }
+    return -1;
+}
+
+void SettingsTree::moveItemForward(QTreeWidgetItem *parent, int oldIndex,
+                                   int newIndex)
+{
+    for (int i = 0; i < oldIndex - newIndex; ++i)
+        delete childAt(parent, newIndex);
+}