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) 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; }; #endif