Method ExpressionTextEdit

src/frontend/widgets/ExpressionTextEdit.cpp:32–58

! \class ExpressionTextEdit \brief Provides a widget for defining mathematical expressions Supports syntax-highlighting and completion. Modified version of https://doc.qt.io/qt-5/qtwidgets-tools-customcompleter-example.html \ingroup frontend */

  \ingroup frontend
*/
ExpressionTextEdit::ExpressionTextEdit(QWidget* parent)
	: KTextEdit(parent)
	, m_highlighter(new EquationHighlighter(this)) {
	QStringList list = ExpressionParser::getInstance()->functions();
	// append description
	for (auto& s : list)
		s.append(ExpressionParser::functionArgumentString(s, XYEquationCurve::EquationType::Cartesian) + QStringLiteral(" - ")
				 + ExpressionParser::getInstance()->functionDescription(s));
	QStringList constants = ExpressionParser::getInstance()->constants();
	for (auto& s : constants) {
		if (s != QLatin1String("..."))
			s.append(QStringLiteral(" - ") + ExpressionParser::getInstance()->constantDescription(s));
	}
	list.append(constants);

	setTabChangesFocus(true);

	m_completer = new QCompleter(list, this);
	m_completer->setWidget(this);
	m_completer->setCompletionMode(QCompleter::PopupCompletion);

	connect(m_completer, QOverload<const QString&>::of(&QCompleter::activated), this, &ExpressionTextEdit::insertCompletion);
	connect(this, &ExpressionTextEdit::textChanged, this, [=]() {
		validateExpression();
	});
	connect(this, &ExpressionTextEdit::cursorPositionChanged, m_highlighter, &EquationHighlighter::rehighlight);
}

EquationHighlighter* ExpressionTextEdit::highlighter() {
	return m_highlighter;