QCodeEditor.hpp

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#pragma once

// Qt
#include <QTextEdit> // Required for inheritance

class QCompleter;
class QLineNumberArea;
class QSyntaxStyle;
class QStyleSyntaxHighlighter;
class QFramedTextAttribute;

class QCodeEditor : public QTextEdit
{
    Q_OBJECT

public:
    explicit QCodeEditor(QWidget* widget=nullptr);

    // Disable copying
    QCodeEditor(const QCodeEditor&) = delete;
    QCodeEditor& operator=(const QCodeEditor&) = delete;

    int getFirstVisibleBlock();

    void setHighlighter(QStyleSyntaxHighlighter* highlighter);

    void setSyntaxStyle(QSyntaxStyle* style);

    void setAutoParentheses(bool enabled);

    bool autoParentheses() const;

    void setTabReplace(bool enabled);

    bool tabReplace() const;

    void setTabReplaceSize(int val);

    int tabReplaceSize() const;

    void setAutoIndentation(bool enabled);

    bool autoIndentation() const;

    void setCompleter(QCompleter* completer);

    QCompleter* completer() const;

public Q_SLOTS:

    void insertCompletion(QString s);

    void updateLineNumberAreaWidth(int);

    void updateLineNumberArea(const QRect& rect);

    void updateExtraSelection();

    void updateStyle();

    void onSelectionChanged();

protected:
    void insertFromMimeData(const QMimeData* source) override;

    void paintEvent(QPaintEvent* e) override;

    void resizeEvent(QResizeEvent* e) override;

    void keyPressEvent(QKeyEvent* e) override;

    void focusInEvent(QFocusEvent *e) override;

private:

    void initDocumentLayoutHandlers();

    void initFont();

    void performConnections();

    void handleSelectionQuery(QTextCursor cursor);

    void updateLineGeometry();

    bool proceedCompleterBegin(QKeyEvent *e);
    void proceedCompleterEnd(QKeyEvent* e);

    QChar charUnderCursor(int offset = 0) const;

    QString wordUnderCursor() const;

    void highlightCurrentLine(QList<QTextEdit::ExtraSelection>& extraSelection);

    void highlightParenthesis(QList<QTextEdit::ExtraSelection>& extraSelection);

    int getIndentationSpaces();

    QStyleSyntaxHighlighter* m_highlighter;
    QSyntaxStyle* m_syntaxStyle;
    QLineNumberArea* m_lineNumberArea;
    QCompleter* m_completer;

    QFramedTextAttribute* m_framedAttribute;

    bool m_autoIndentation;
    bool m_autoParentheses;
    bool m_replaceTab;
    QString m_tabReplace;
};