Move codeeditor to folder

pglab/codeeditor/CodeEditor.h

@@ -0,0 +1,55 @@
+#ifndef CODEEDITOR_H
+#define CODEEDITOR_H
+
+#include <QPlainTextEdit>
+#include <set>
+
+/** This class adds some capabilities to QPlainTextEdit that are useful
+ * in code editor scenarios.
+ */
+class CodeEditor : public QPlainTextEdit
+{
+	Q_OBJECT
+public:
+	explicit CodeEditor(QWidget *parent = nullptr);
+
+	void gutterAreaPaintEvent(QPaintEvent *event);
+	int gutterAreaWidth();
+
+	void addErrorMarker(int position, int length);
+	void clearErrorMarkers();
+	void setFont(const QFont &);
+	void setTabSize(int chars);
+protected:
+	void resizeEvent(QResizeEvent *event) override;
+	void keyPressEvent(QKeyEvent *e) override;
+
+signals:
+
+public slots:
+
+private slots:
+	void updateGutterAreaWidth(int newBlockCount);
+	void highlightCurrentLine();
+	void updateGutterArea(const QRect &, int);
+	void onTextChanged();
+
+
+private:
+	QWidget *gutterArea;
+
+	QTextEdit::ExtraSelection currentLine;
+	QList<QTextEdit::ExtraSelection> errorMarkers;
+
+	std::set<int> errorLines;
+
+	// Settings
+	int m_tabSize = 0;  // tabSize in characters
+	bool m_useTab = false;
+
+	void updateExtraSelections();
+	bool indentSelection(bool indent);
+
+};
+
+#endif // CODEEDITOR_H