treatmentexpressionedit.h

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#ifndef OPENSWMMVIS_UI_TREATMENTEXPRESSIONEDIT_H
#define OPENSWMMVIS_UI_TREATMENTEXPRESSIONEDIT_H
 
#include <QPalette>
#include <QStringList>
#include <QStyledItemDelegate>
#include <QSyntaxHighlighter>
#include <QTextCharFormat>
#include <QTextEdit>
 
class QCompleter;
 
namespace openswmmvis::ui {
 
class TreatmentSyntaxHighlighter : public QSyntaxHighlighter
{
    Q_OBJECT
 
public:
    explicit TreatmentSyntaxHighlighter(QTextDocument *doc);
 
    static QStringList variableNames();   
    static QStringList functionNames();   
    static QStringList allKeywords();     
 
    void setPalette(const QPalette &palette);
 
protected:
    void highlightBlock(const QString &text) override;
 
private:
    void rebuildFormats_();
 
    QPalette        m_palette;
    QTextCharFormat m_fmtVariable;
    QTextCharFormat m_fmtFunction;
    QTextCharFormat m_fmtOperator;
    QTextCharFormat m_fmtNumber;
    QTextCharFormat m_fmtUnknown;
};
 
class TreatmentExpressionEdit : public QTextEdit
{
    Q_OBJECT
 
public:
    explicit TreatmentExpressionEdit(void *engineHandle,
                                     QWidget *parent = nullptr);
 
    [[nodiscard]] QString expression() const { return toPlainText(); }
    void setExpression(const QString &text);
 
    void validateNow();
 
signals:
    void validationChanged(bool ok, const QString &msg, int col);
    void editingFinished();   
 
protected:
    void keyPressEvent(QKeyEvent *e) override;
    void focusInEvent(QFocusEvent *e) override;
 
private:
    void showCompleter_(const QString &prefix);
    void insertCompletion_(const QString &completion);
    [[nodiscard]] QString textUnderCursor_() const;
 
    void                       *m_engine     = nullptr;
    TreatmentSyntaxHighlighter *m_highlighter = nullptr;
    QCompleter                 *m_completer  = nullptr;
    class QTimer               *m_debounce   = nullptr;
};
 
class TreatmentExpressionDelegate : public QStyledItemDelegate
{
    Q_OBJECT
 
public:
    explicit TreatmentExpressionDelegate(void *engineHandle,
                                         QObject *parent = nullptr);
 
    QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,
                          const QModelIndex &index) const override;
    void setEditorData(QWidget *editor, const QModelIndex &index) const override;
    void setModelData(QWidget *editor, QAbstractItemModel *model,
                      const QModelIndex &index) const override;
 
signals:
    void validationChanged(bool ok, const QString &msg, int col) const;
 
private:
    void *m_engine = nullptr;
};
 
} // namespace openswmmvis::ui
 
#endif // OPENSWMMVIS_UI_TREATMENTEXPRESSIONEDIT_H