Qt 4.6: codeeditor.h Example File (widgets/codeeditor/codeeditor.h)

|  | Home · All Classes · Overviews |

# codeeditor.h Example File
widgets/codeeditor/codeeditor.h

     /****************************************************************************
     **
     ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
     ** Contact: Nokia Corporation (qt-info@nokia.com)
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:LGPL$
     ** No Commercial Usage
     ** This file contains pre-release code and may not be distributed.
     ** You may use this file in accordance with the terms and conditions
     ** contained in the Technology Preview License Agreement accompanying
     ** this package.
     **
     ** GNU Lesser General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU Lesser
     ** General Public License version 2.1 as published by the Free Software
     ** Foundation and appearing in the file LICENSE.LGPL included in the
     ** packaging of this file.  Please review the following information to
     ** ensure the GNU Lesser General Public License version 2.1 requirements
     ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
     **
     ** In addition, as a special exception, Nokia gives you certain
     ** additional rights.  These rights are described in the Nokia Qt LGPL
     ** Exception version 1.1, included in the file LGPL_EXCEPTION.txt in this
     ** package.
     **
     ** If you have questions regarding the use of this file, please contact
     ** Nokia at qt-info@nokia.com.
     **
     **
     **
     **
     **
     **
     **
     **
     ** $QT_END_LICENSE$
     **
     ****************************************************************************/

     #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