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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set et sw=2 ts=2: */
+/****************************************************************************
+ **
+ ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+ ** Contact: http://www.qt-project.org/legal
+ **
+ ** This file is part of the examples of the Qt Toolkit.
+ **
+ ** $QT_BEGIN_LICENSE:BSD$
+ ** You may use this file under the terms of the BSD license as follows:
+ **
+ ** "Redistribution and use in source and binary forms, with or without
+ ** modification, are permitted provided that the following conditions are
+ ** met:
+ **   * Redistributions of source code must retain the above copyright
+ **     notice, this list of conditions and the following disclaimer.
+ **   * Redistributions in binary form must reproduce the above copyright
+ **     notice, this list of conditions and the following disclaimer in
+ **     the documentation and/or other materials provided with the
+ **     distribution.
+ **   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
+ **     of its contributors may be used to endorse or promote products derived
+ **     from this software without specific prior written permission.
+ **
+ **
+ ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+ **
+ ** $QT_END_LICENSE$
+ **
+ ****************************************************************************/
+
+#ifndef __CODEEDITOR_H__
+#define __CODEEDITOR_H__
+
+#include <QPlainTextEdit>
+#include <QObject>
+
+class QPaintEvent;
+class QResizeEvent;
+class QSize;
+class QWidget;
+
+class LineNumberArea;
+
+class CodeEditor : public QPlainTextEdit
+{
+	Q_OBJECT
+
+  public:
+	CodeEditor(QWidget *parent = 0);
+
+	void lineNumberAreaPaintEvent(QPaintEvent *event);
+	int lineNumberAreaWidth();
+
+protected:
+	void resizeEvent(QResizeEvent *event);
+
+public slots:
+  void runningLine(int lineno);
+
+private slots:
+	void updateLineNumberAreaWidth(int newBlockCount);
+	void highlightCurrentLine();
+	void updateLineNumberArea(const QRect &, int);
+
+private:
+	QWidget *lineNumberArea;
+  int lineNumber;
+};
+
+
+class LineNumberArea : public QWidget
+{
+public:
+  LineNumberArea(CodeEditor *editor) : QWidget(editor) {
+		codeEditor = editor;
+	}
+
+	QSize sizeHint() const {
+		return QSize(codeEditor->lineNumberAreaWidth(), 0);
+	}
+
+protected:
+	void paintEvent(QPaintEvent *event) {
+		codeEditor->lineNumberAreaPaintEvent(event);
+	}
+
+private:
+	CodeEditor *codeEditor;
+};
+
+#endif/*__CODEEDITOR_H__*/