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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 <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);
+
+ 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