codeeditor.hpp

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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 /* CODEEDITOR_H_ */