codeeditor.h

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#ifndef CODEEDITOR_H
#define CODEEDITOR_H
 
#include <QPlainTextEdit>
#include <QWidget>
 
class LineNumberArea;
 
class CodeEditor : public QPlainTextEdit {
  Q_OBJECT
 
 public:
  explicit CodeEditor(QWidget* parent = nullptr);
 
  void lineNumberAreaPaintEvent(QPaintEvent* event);
  int lineNumberAreaWidth();

  void setLineNumbersVisible(bool visible);
  bool lineNumbersVisible() const;

  void setLightTheme(bool light);
 
 protected:
  void resizeEvent(QResizeEvent* event) override;
  void changeEvent(QEvent* event) override;
 
 private slots:
  void updateLineNumberAreaWidth(int newBlockCount);
  void highlightCurrentLine();
  void updateLineNumberArea(const QRect& rect, int dy);
 
 private:
  LineNumberArea* lineNumberArea;
  bool showLineNumbers = true;
  bool lightTheme = false;
};
 
class LineNumberArea : public QWidget {
 public:
  explicit LineNumberArea(CodeEditor* editor)
      : QWidget(editor), codeEditor(editor) {}
 
  QSize sizeHint() const override {
    return QSize(codeEditor->lineNumberAreaWidth(), 0);
  }
 
 protected:
  void paintEvent(QPaintEvent* event) override {
    codeEditor->lineNumberAreaPaintEvent(event);
  }
 
 private:
  CodeEditor* codeEditor;
};
 
#endif  // CODEEDITOR_H