Method flags

src/backend/core/AspectTreeModel.cpp:289–346

}

Qt::ItemFlags AspectTreeModel::flags(const QModelIndex& index) const {
	if (!index.isValid())
		return Qt::NoItemFlags;

	Qt::ItemFlags result;
	auto* aspect = static_cast<AbstractAspect*>(index.internalPointer());

	if (!m_selectableAspects.isEmpty()) {
		for (AspectType type : m_selectableAspects) {
			if (aspect->inherits(type)) {
				result = Qt::ItemIsEnabled | Qt::ItemIsSelectable;
				if (index != this->index(0, 0, QModelIndex()) && !m_filterString.isEmpty()) {
					if (this->containsFilterString(aspect))
						result = Qt::ItemIsEnabled | Qt::ItemIsSelectable;
					else
						result &= ~Qt::ItemIsEnabled;
				}
				break;
			} else
				result &= ~Qt::ItemIsEnabled;
		}
	} else {
		// default case: the list for the selectable aspects is empty and all aspects are selectable.
		//  Apply filter, if available. Indices, that don't match the filter are not selectable.
		// Don't apply any filter to the very first index in the model  - this top index corresponds to the project item.
		if (index != this->index(0, 0, QModelIndex()) && !m_filterString.isEmpty()) {
			if (this->containsFilterString(aspect))
				result = Qt::ItemIsEnabled | Qt::ItemIsSelectable;
			else
				result = Qt::ItemIsSelectable;
		} else
			result = Qt::ItemIsEnabled | Qt::ItemIsSelectable;
	}

	// the columns "name" and "description" are editable
	if (!m_readOnly) {
		if (index.column() == 0 || index.column() == 3)
			result |= Qt::ItemIsEditable;
	}

	const auto* column = dynamic_cast<const Column*>(aspect);
	if (column) {
		// allow to drag and drop columns for the faster creation of curves in the plots.
		// TODO: allow drag&drop later for other objects too, once we implement copy and paste in the project explorer
		result = result | Qt::ItemIsDragEnabled | Qt::ItemIsDropEnabled;

		if (m_plottableColumnsOnly && !column->isPlottable())
			result &= ~Qt::ItemIsEnabled;

		if (m_numericColumnsOnly && !column->isNumeric())
			result &= ~Qt::ItemIsEnabled;

		if (m_nonEmptyNumericColumnsOnly && !(column->isNumeric() && column->hasValues()))
			result &= ~Qt::ItemIsEnabled;
	}

	return result;
}