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diff --git a/src/plugins/platformthemes/gtk3/qgtk3dialoghelpers.h b/src/plugins/platformthemes/gtk3/qgtk3dialoghelpers.h
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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://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.LGPL3 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-3.0.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 (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QGTK3DIALOGHELPERS_H
+#define QGTK3DIALOGHELPERS_H
+
+#include <QtCore/qhash.h>
+#include <QtCore/qlist.h>
+#include <QtCore/qurl.h>
+#include <QtCore/qscopedpointer.h>
+#include <QtCore/qstring.h>
+#include <qpa/qplatformdialoghelper.h>
+
+typedef struct _GtkDialog GtkDialog;
+typedef struct _GtkFileFilter GtkFileFilter;
+
+QT_BEGIN_NAMESPACE
+
+class QGtk3Dialog;
+class QColor;
+
+class QGtk3ColorDialogHelper : public QPlatformColorDialogHelper
+{
+    Q_OBJECT
+
+public:
+    QGtk3ColorDialogHelper();
+    ~QGtk3ColorDialogHelper();
+
+    bool show(Qt::WindowFlags flags, Qt::WindowModality modality, QWindow *parent) Q_DECL_OVERRIDE;
+    void exec() Q_DECL_OVERRIDE;
+    void hide() Q_DECL_OVERRIDE;
+
+    void setCurrentColor(const QColor &color) Q_DECL_OVERRIDE;
+    QColor currentColor() const Q_DECL_OVERRIDE;
+
+private Q_SLOTS:
+    void onAccepted();
+
+private:
+    static void onColorChanged(QGtk3ColorDialogHelper *helper);
+    void applyOptions();
+
+    QScopedPointer<QGtk3Dialog> d;
+};
+
+class QGtk3FileDialogHelper : public QPlatformFileDialogHelper
+{
+    Q_OBJECT
+
+public:
+    QGtk3FileDialogHelper();
+    ~QGtk3FileDialogHelper();
+
+    bool show(Qt::WindowFlags flags, Qt::WindowModality modality, QWindow *parent) Q_DECL_OVERRIDE;
+    void exec() Q_DECL_OVERRIDE;
+    void hide() Q_DECL_OVERRIDE;
+
+    bool defaultNameFilterDisables() const Q_DECL_OVERRIDE;
+    void setDirectory(const QUrl &directory) Q_DECL_OVERRIDE;
+    QUrl directory() const Q_DECL_OVERRIDE;
+    void selectFile(const QUrl &filename) Q_DECL_OVERRIDE;
+    QList<QUrl> selectedFiles() const Q_DECL_OVERRIDE;
+    void setFilter() Q_DECL_OVERRIDE;
+    void selectNameFilter(const QString &filter) Q_DECL_OVERRIDE;
+    QString selectedNameFilter() const Q_DECL_OVERRIDE;
+
+private Q_SLOTS:
+    void onAccepted();
+
+private:
+    static void onSelectionChanged(GtkDialog *dialog, QGtk3FileDialogHelper *helper);
+    static void onCurrentFolderChanged(QGtk3FileDialogHelper *helper);
+    void applyOptions();
+    void setNameFilters(const QStringList &filters);
+
+    QUrl _dir;
+    QList<QUrl> _selection;
+    QHash<QString, GtkFileFilter*> _filters;
+    QHash<GtkFileFilter*, QString> _filterNames;
+    QScopedPointer<QGtk3Dialog> d;
+};
+
+class QGtk3FontDialogHelper : public QPlatformFontDialogHelper
+{
+    Q_OBJECT
+
+public:
+    QGtk3FontDialogHelper();
+    ~QGtk3FontDialogHelper();
+
+    bool show(Qt::WindowFlags flags, Qt::WindowModality modality, QWindow *parent) Q_DECL_OVERRIDE;
+    void exec() Q_DECL_OVERRIDE;
+    void hide() Q_DECL_OVERRIDE;
+
+    void setCurrentFont(const QFont &font) Q_DECL_OVERRIDE;
+    QFont currentFont() const Q_DECL_OVERRIDE;
+
+private Q_SLOTS:
+    void onAccepted();
+
+private:
+    void applyOptions();
+
+    QScopedPointer<QGtk3Dialog> d;
+};
+
+QT_END_NAMESPACE
+
+#endif // QGTK3DIALOGHELPERS_H