Method addVariable

src/frontend/dockwidgets/XYFunctionCurveDock.cpp:178–224

SLOTs for changes triggered in XYFunctionCurveDock

//**** SLOTs for changes triggered in XYFunctionCurveDock ****
//*************************************************************
void XYFunctionCurveDock::addVariable() {
	const auto row{m_variableLineEdits.size()};

	// text field for the variable name
	auto* le{new QLineEdit};
	le->setToolTip(i18n("Variable name can contain letters, digits and '_' only and should start with a letter"));
	auto* validator = new QRegularExpressionValidator(QRegularExpression(QLatin1String("[a-zA-Z][a-zA-Z0-9_]*")), le);
	le->setValidator(validator);
	// le->setMaximumWidth(40); // hardcoding size is bad. 40 is enough for three letters
	connect(le, &QLineEdit::textChanged, this, &XYFunctionCurveDock::variableNameChanged);
	m_gridLayoutVariables->addWidget(le, row, 0, 1, 1);
	m_variableLineEdits << le;

	// combo box for the data column
	auto* cb{new TreeViewComboBox()};
	cb->setSizePolicy(QSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred));
	connect(cb, &TreeViewComboBox::currentModelIndexChanged, this, &XYFunctionCurveDock::variableColumnChanged);
	m_gridLayoutCurves->addWidget(cb, row, 2, 1, 1);
	m_variableComboBoxes << cb;

	setModelCurve(cb);

	// don't allow to select columns to be calculated as variable columns (avoid circular dependencies)
	QList<const AbstractAspect*> aspects;
	for (auto* c : m_curvesList)
		aspects << c;
	cb->setHiddenAspects(aspects);

	// for the variable curve select the first non-selected curve
	const auto& plot = m_curve->plot();
	for (auto* c : plot->children<XYCurve>()) {
		if (m_curvesList.indexOf(c) == -1) {
			cb->setCurrentModelIndex(aspectModel()->modelIndexOfAspect(c));
			break;
		}
	}

	// add delete-button for the just added variable
	if (row != 0) {
		auto* b{new QToolButton()};
		b->setIcon(QIcon::fromTheme(QStringLiteral("list-remove")));
		b->setToolTip(i18n("Delete variable"));
		m_gridLayoutCurves->addWidget(b, row, 3, 1, 1);
		m_variableDeleteButtons << b;
		connect(b, &QToolButton::pressed, this, &XYFunctionCurveDock::deleteVariable);
	}
}

void XYFunctionCurveDock::removeAllVariableWidgets() {
	while (!m_variableLineEdits.isEmpty())