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

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 #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