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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** 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 Nokia Corporation 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 <QObject>
+#include <QPlainTextEdit>
+
+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);
+
+private slots:
+  void updateLineNumberAreaWidth(int newBlockCount);
+  void highlightCurrentLine();
+  void updateLineNumberArea(const QRect&, int);
+
+private:
+  QWidget* lineNumberArea;
+};
+
+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