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#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