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diff --git a/src/plugins/texteditor/codestyleeditor.cpp b/src/plugins/texteditor/codestyleeditor.cpp
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+++ b/src/plugins/texteditor/codestyleeditor.cpp
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+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (info@qt.nokia.com)
+**
+**
+** GNU Lesser General Public License Usage
+**
+** 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.
+**
+** Other Usage
+**
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at info@qt.nokia.com.
+**
+**************************************************************************/
+
+#include "codestyleeditor.h"
+
+#include "icodestylepreferencesfactory.h"
+#include "icodestylepreferences.h"
+#include "codestyleselectorwidget.h"
+#include "texteditorsettings.h"
+#include "displaysettings.h"
+#include "tabsettings.h"
+#include "indenter.h"
+#include "snippets/snippeteditor.h"
+#include "snippets/isnippetprovider.h"
+#include <QtGui/QVBoxLayout>
+#include <QtGui/QTextBlock>
+
+using namespace TextEditor;
+
+CodeStyleEditor::CodeStyleEditor(ICodeStylePreferencesFactory *factory,
+                                 ICodeStylePreferences *codeStyle, QWidget *parent)
+    : QWidget(parent),
+      m_factory(factory),
+      m_codeStyle(codeStyle)
+{
+    m_layout = new QVBoxLayout(this);
+    CodeStyleSelectorWidget *selector = new CodeStyleSelectorWidget(factory, this);
+    selector->setCodeStyle(codeStyle);
+    m_preview = new SnippetEditorWidget(this);
+    TextEditor::TextEditorSettings *settings = TextEditorSettings::instance();
+    m_preview->setFontSettings(settings->fontSettings());
+    DisplaySettings displaySettings = m_preview->displaySettings();
+    displaySettings.m_visualizeWhitespace = true;
+    m_preview->setDisplaySettings(displaySettings);
+    ISnippetProvider *provider = factory->snippetProvider();
+    if (provider)
+        provider->decorateEditor(m_preview);
+    m_layout->addWidget(selector);
+    m_layout->addWidget(m_preview);
+    connect(codeStyle, SIGNAL(currentTabSettingsChanged(TextEditor::TabSettings)),
+            this, SLOT(updatePreview()));
+    connect(codeStyle, SIGNAL(currentValueChanged(QVariant)),
+            this, SLOT(updatePreview()));
+    connect(codeStyle, SIGNAL(currentPreferencesChanged(TextEditor::ICodeStylePreferences*)),
+            this, SLOT(updatePreview()));
+    m_preview->setCodeStyle(m_codeStyle);
+    m_preview->setPlainText(factory->previewText());
+
+    updatePreview();
+}
+
+void CodeStyleEditor::clearMargins()
+{
+    m_layout->setContentsMargins(QMargins());
+}
+
+void CodeStyleEditor::updatePreview()
+{
+    QTextDocument *doc = m_preview->document();
+
+    m_preview->indenter()->invalidateCache(doc);
+
+    QTextBlock block = doc->firstBlock();
+    QTextCursor tc = m_preview->textCursor();
+    tc.beginEditBlock();
+    while (block.isValid()) {
+        m_preview->indenter()->indentBlock(doc, block, QChar::Null, m_codeStyle->currentTabSettings());
+
+        block = block.next();
+    }
+    tc.endEditBlock();
+}