notepad.h

#ifndef NOTEPAD_H
#define NOTEPAD_H

#include <QPainter>
#include <QTextBlock>
#include <QPlainTextEdit>
#include <QRegularExpression>
#include <QSyntaxHighlighter>
#include <QTextCharFormat>
#include <QFontMetrics>
#include <QObject>


class CodeEditor : public QPlainTextEdit
{
    Q_OBJECT
public:
    CodeEditor(QWidget *parent = nullptr);

    void lineNumberAreaPaintEvent(QPaintEvent *event);
    int lineNumberAreaWidth();

protected:
    void resizeEvent(QResizeEvent *event) override;

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 override {
        return QSize(codeEditor->lineNumberAreaWidth(), 0);
    }

protected:
    void paintEvent(QPaintEvent *event) override {
        codeEditor->lineNumberAreaPaintEvent(event);
    }

private:
    CodeEditor *codeEditor;
};


class Highlighter : public QSyntaxHighlighter
{
    Q_OBJECT

public:
    Highlighter(QTextDocument *parent = nullptr);

protected:
    void highlightBlock(const QString &text) override;

private:
     struct HighlightingRule
     {
         QRegularExpression pattern;
         QTextCharFormat format;
     };
     QVector<HighlightingRule> highlightingRules;

     QRegularExpression commentStartExpression;
     QRegularExpression commentEndExpression;

     QTextCharFormat keywordFormat;
     QTextCharFormat classFormat;
     QTextCharFormat singleLineCommentFormat;
     QTextCharFormat multiLineCommentFormat;
     QTextCharFormat quotationFormat;
     QTextCharFormat functionFormat;
};

class notePad : public QWidget{
	Q_OBJECT
	public:
		explicit notePad(QWidget *parent = nullptr);
		CodeEditor *editor;
		CodeEditor* getEditor() { return this->editor; }
		
	public slots:
		void main_c();
        void camera_c();
        void camera_h();
        void config();
        void debug_c();
	
	private:
		QString filename;
		Highlighter *highlighter;
};


#endif