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diff --git a/src/kile/previewwidget.h b/src/kile/previewwidget.h
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+//
+// C++ Interface: previewwidget
+//
+// Description: 
+//
+//
+// Author: Mathias Soeken <[email protected]>, (C) 2006
+//
+// Copyright: See COPYING file that comes with this distribution
+//
+//
+#ifndef PREVIEWWIDGET_H
+#define PREVIEWWIDGET_H
+
+#include <qwidget.h>
+
+class QImage;
+class QPaintEvent;
+
+class KileInfo;
+
+namespace KileTool 
+{
+  class Base;
+}
+
+namespace KileWidget 
+{
+
+/**
+ * Widget which can display PNG images from Math LaTeX
+ * Code
+ * 
+ * This is used to be inserted in the bottom bar of the kile
+ * main widget. When putting the cursor in a mathgroup, the LaTeX 
+ * source should be extracted and rendered in this widget.
+ * 
+ * This widget uses one new Tool: DVItoPNG which converts
+ * a dvi file to an png image, which is fitted to the size
+ * of the formula).
+ * 
+ * You could use this widget to implement a formula editor in Kile, 
+ * where the editor is the editor, but with this widget you can see
+ * the result in a appropriate size just in time.
+ * 
+ * @author Mathias Soeken <[email protected]>
+ */
+
+class PreviewWidget : public QWidget
+{
+	Q_OBJECT
+  
+public:
+	PreviewWidget(KileInfo *info, QWidget *parent = 0, const char *name = 0);
+	~PreviewWidget();
+
+  /**
+   * Trys to paint the current mathgroup of 
+   * the current document.
+   *
+   * If a document is open and the cursor is
+   * inside a mathgroup, a PNG is generated
+   * containing this mathgroup.
+   * 
+   * This PNG image is then displayed on the
+   * widget.
+   */
+	void showActivePreview(const QString &text,const QString &textfilename,int startrow,int previewtype);
+
+private:
+	enum { pwDvipng=0, pwDvipsConvert, pwConvert };
+
+	KileInfo *m_info;
+	QImage *m_previewImage;
+	bool m_running;
+	QString m_conversionTool;
+
+protected:
+	void paintEvent (QPaintEvent*);
+	void showError(const QString &text);
+
+public slots:
+  /**
+   * Notify, if the DVItoPNG tool is done.
+   *
+   * Because the tool runs async. we
+   * must wait, if the process is done.
+   * 
+   * Then we try to generate a image of the
+   * temporary PNG filename and display it on 
+   * the widget.
+   *
+   * The size of the widget is also adjusted
+   * to the size of the widget.
+   */
+	void drawImage();
+	void toolDestroyed();
+}; 
+
+}
+
+#endif