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diff --git a/src/quickcontrols2/qquickstyle.cpp b/src/quickcontrols2/qquickstyle.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Quick Controls 2 module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later 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 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qquickstyle.h"
+#include "qquickstyleattached_p.h"
+
+#include <QtCore/qdir.h>
+#include <QtCore/qdebug.h>
+#include <QtCore/qsettings.h>
+#include <QtCore/qlibraryinfo.h>
+#include <QtGui/private/qguiapplication_p.h>
+#include <QtQml/private/qqmlmetatype_p.h>
+#include <QtQml/qqmlengine.h>
+#include <QtQml/qqmlfile.h>
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QQuickStyle
+    \brief The QQuickStyle class allows configuring the application style.
+    \inmodule QtQuickControls2
+    \since 5.7
+
+    QQuickStyle provides API for querying and configuring the application
+    \l {Styling Qt Quick Controls 2}{styles} of Qt Quick Controls 2.
+
+    \code
+    #include <QGuiApplication>
+    #include <QQmlApplicationEngine>
+    #include <QQuickStyle>
+
+    int main(int argc, char *argv[])
+    {
+        QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+        QGuiApplication app(argc, argv);
+
+        QQuickStyle::setStyle("Material");
+
+        QQmlApplicationEngine engine;
+        engine.load(QUrl("qrc:/main.qml"));
+
+        return app.exec();
+    }
+    \endcode
+
+    \note The style must be configured \b before loading QML that imports
+    Qt Quick Controls 2. It is not possible to change the style after the QML
+    types have been registered.
+
+    \sa {Styling Qt Quick Controls 2}
+*/
+
+// TODO: QQmlImportDatabase::defaultImportPathList()
+static QStringList defaultImportPathList()
+{
+    QStringList importPaths;
+    importPaths.reserve(3);
+    importPaths += QLibraryInfo::location(QLibraryInfo::Qml2ImportsPath);
+
+    if (Q_UNLIKELY(!qEnvironmentVariableIsEmpty("QML2_IMPORT_PATH"))) {
+        const QByteArray envImportPath = qgetenv("QML2_IMPORT_PATH");
+        importPaths += QString::fromLatin1(envImportPath).split(QDir::listSeparator(), QString::SkipEmptyParts);
+    }
+
+    importPaths += QStringLiteral("qrc:/qt-project.org/imports");
+    importPaths += QCoreApplication::applicationDirPath();
+    return importPaths;
+}
+
+struct QQuickStyleSpec
+{
+    QQuickStyleSpec() : resolved(false) { }
+
+    QString name()
+    {
+        if (!resolved)
+            resolve();
+        return style.mid(style.lastIndexOf(QLatin1Char('/')) + 1);
+    }
+
+    QString path()
+    {
+        if (!resolved)
+            resolve();
+        QString s = style;
+        if (QQmlFile::isLocalFile(s))
+            s = QQmlFile::urlToLocalFileOrQrc(s);
+        return s.left(s.lastIndexOf(QLatin1Char('/')) + 1);
+    }
+
+    void setStyle(const QString &s)
+    {
+        style = s;
+        resolved = false;
+        resolve();
+    }
+
+    void resolve()
+    {
+        if (style.isEmpty())
+            style = QGuiApplicationPrivate::styleOverride;
+        if (style.isEmpty())
+            style = QString::fromLatin1(qgetenv("QT_QUICK_CONTROLS_STYLE"));
+        if (style.isEmpty()) {
+            QSharedPointer<QSettings> settings = QQuickStyleAttached::settings(QStringLiteral("Controls"));
+            if (settings)
+                style = settings->value(QStringLiteral("Style")).toString();
+        }
+
+        if (QGuiApplication::instance()) {
+            if (!style.contains(QLatin1Char('/'))) {
+                const QString targetPath = QStringLiteral("QtQuick/Controls.2");
+                const QStringList importPaths = defaultImportPathList();
+
+                for (const QString &importPath : importPaths) {
+                    QDir importDir(importPath);
+                    if (importDir.cd(targetPath)) {
+                        if (style.isEmpty()) {
+                            style = importDir.absolutePath() + QLatin1Char('/');
+                            resolved = true;
+                            break;
+                        }
+                        const QStringList entries = importDir.entryList(QStringList(), QDir::Dirs | QDir::NoDotAndDotDot);
+                        for (const QString &entry : entries) {
+                            if (entry.compare(style, Qt::CaseInsensitive) == 0) {
+                                style = importDir.absoluteFilePath(entry);
+                                resolved = true;
+                                break;
+                            }
+                        }
+                    }
+                    if (resolved)
+                        break;
+                }
+            }
+            resolved = true;
+        }
+    }
+
+    bool resolved;
+    QString style;
+};
+
+Q_GLOBAL_STATIC(QQuickStyleSpec, styleSpec)
+
+/*!
+    Returns the name of the application style.
+
+    \note The application style can be specified by passing a \c -style command
+          line argument. Therefore \c name() may not return a fully resolved
+          value if called before constructing a QGuiApplication.
+*/
+QString QQuickStyle::name()
+{
+    return styleSpec()->name();
+}
+
+/*!
+    Returns the path of an overridden application style, or an empty
+    string if the style is one of the built-in Qt Quick Controls 2 styles.
+
+    \note The application style can be specified by passing a \c -style command
+          line argument. Therefore \c path() may not return a fully resolved
+          value if called before constructing a QGuiApplication.
+*/
+QString QQuickStyle::path()
+{
+    return styleSpec()->path();
+}
+
+/*!
+    Sets the application style to \a style.
+
+    \note The style must be configured \b before loading QML that imports Qt Quick Controls 2.
+          It is not possible to change the style after the QML types have been registered.
+*/
+void QQuickStyle::setStyle(const QString &style)
+{
+    if (QQmlMetaType::isModule(QStringLiteral("QtQuick.Controls"), 2, 0)) {
+        qWarning() << "ERROR: QQuickStyle::setStyle() must be called before loading QML that imports Qt Quick Controls 2.";
+        return;
+    }
+
+    styleSpec()->setStyle(style);
+}
+
+QT_END_NAMESPACE