Method addVariable

src/frontend/spreadsheet/FunctionValuesDialog.cpp:273–331

}

void FunctionValuesDialog::addVariable() {
	auto* layout{ui.gridLayoutVariables};
	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);
	// hardcoding size is bad. 40 is enough for three letters
	le->setMaximumWidth(40);
	connect(le, &QLineEdit::textChanged, this, &FunctionValuesDialog::variableNameChanged);
	layout->addWidget(le, row, 0, 1, 1);
	m_variableLineEdits << le;
	auto* l{new QLabel(QStringLiteral("="))};
	layout->addWidget(l, row, 1, 1, 1);
	m_variableLabels << l;

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

	cb->setTopLevelClasses(TreeViewComboBox::plotColumnTopLevelClasses());
	cb->setModel(m_aspectTreeModel.get());

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

	// for the variable column select the first non-selected column in the spreadsheet
	for (auto* col : m_spreadsheet->children<Column>()) {
		if (m_columns.indexOf(col) == -1) {
			cb->setCurrentModelIndex(m_aspectTreeModel->modelIndexOfAspect(col));
			break;
		}
	}

	// move the add-button to the next row
	layout->removeWidget(ui.bAddVariable);
	layout->addWidget(ui.bAddVariable, row + 1, 3, 1, 1);

	// 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"));
		layout->addWidget(b, row, 3, 1, 1);
		m_variableDeleteButtons << b;
		connect(b, &QToolButton::pressed, this, &FunctionValuesDialog::deleteVariable);
	}

	ui.lVariable->setText(i18n("Variables:"));

	// TODO: adjust the tab-ordering after new widgets were added