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diff --git a/kio/kfile/kpreviewwidgetbase.h b/kio/kfile/kpreviewwidgetbase.h
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+/* This file is part of the KDE libraries
+ * Copyright (C) 2001 Frerich Raabe <raabe@kde.org>
+ *               2003 Carsten Pfeiffer <pfeiffer@kde.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __KPREVIEWWIDGETBASE_H__
+#define __KPREVIEWWIDGETBASE_H__
+
+#include <qptrdict.h>
+#include <qwidget.h>
+
+#include <kdelibs_export.h>
+
+class KURL;
+
+/**
+ * Abstract baseclass for all preview widgets which shall be used via
+ * KFileDialog::setPreviewWidget(const KPreviewWidgetBase *).
+ * Ownership will be transferred to KFileDialog, so you have to create
+ * the preview with "new" and let KFileDialog delete it.
+ *
+ * Just derive your custom preview widget from KPreviewWidgetBase and implement
+ * all the pure virtual methods. The slot showPreview(const KURL &) is called
+ * every time the file selection changes.
+ *
+ * @short Abstract baseclass for all preview widgets.
+ * @author Frerich Raabe <raabe@kde.org>
+ */
+class KIO_EXPORT KPreviewWidgetBase : public QWidget
+{
+    Q_OBJECT
+
+public:
+    /**
+     * Constructor. Construct the user interface of your preview widget here
+     * and pass the KFileDialog this preview widget is going to be used in as
+     * the parent.
+     *
+     * @param parent The KFileDialog this preview widget is going to be used in
+     * @param name The internal name of this object
+     */
+    KPreviewWidgetBase(QWidget *parent, const char *name=0);
+    ~KPreviewWidgetBase();
+
+public slots:
+    /**
+     * This slot is called every time the user selects another file in the
+     * file dialog. Implement the stuff necessary to reflect the change here.
+     *
+     * @param url The URL of the currently selected file.
+     */
+    virtual void showPreview(const KURL &url) = 0;
+
+    /**
+     * Reimplement this to clear the preview. This is called when e.g. the
+     * selection is cleared or when multiple selections exist, or the directory
+     * is changed.
+     */
+    virtual void clearPreview() = 0;
+
+    QStringList supportedMimeTypes() const;
+
+protected:
+    void setSupportedMimeTypes( const QStringList& mimeTypes );
+
+protected:
+    virtual void virtual_hook( int, void* ) {};
+
+private:
+    class KPreviewWidgetBasePrivate;
+    KPreviewWidgetBasePrivate * d() const {
+        return s_private->find( const_cast<KPreviewWidgetBase*>( this ) );
+    }
+    static QPtrDict<KPreviewWidgetBasePrivate> * s_private;
+};
+
+#endif