Method sortMapping

src/eepp/ui/models/sortingproxymodel.cpp:232–289

}

void SortingProxyModel::sortMapping( SortingProxyModel::Mapping& mapping, int column,
									 SortOrder sortOrder ) {
	if ( column == -1 ) {
		int rowCount = source().rowCount( mapping.sourceParent );
		for ( int i = 0; i < rowCount; ++i ) {
			mapping.sourceRows[i] = i;
			mapping.proxyRows[i] = i;
		}
		return;
	}

	auto oldSourceRows = mapping.sourceRows;

	int rowCount = source().rowCount( mapping.sourceParent );
	for ( int i = 0; i < rowCount; ++i )
		mapping.sourceRows[i] = i;

	std::stable_sort(
		mapping.sourceRows.begin(), mapping.sourceRows.end(), [&]( auto row1, auto row2 ) -> bool {
			bool isLessThan =
				this->lessThan( mSource->index( row1, column, mapping.sourceParent ),
								mSource->index( row2, column, mapping.sourceParent ) );
			return sortOrder == SortOrder::Ascending ? isLessThan : !isLessThan;
		} );

	for ( int i = 0; i < rowCount; ++i )
		mapping.proxyRows[mapping.sourceRows[i]] = i;

	// FIXME: I really feel like this should be done at the view layer somehow.
	forEachView( [&]( UIAbstractView* view ) {
		// Update the view's selection.
		view->getSelection().changeFromModel( [&]( ModelSelection& selection ) {
			std::vector<ModelIndex> selectedIndexesInSource;
			std::vector<ModelIndex> staleIndexesInSelection;
			selection.forEachIndex( [&]( const ModelIndex& index ) {
				if ( index.parent() == mapping.sourceParent ) {
					staleIndexesInSelection.push_back( index );
					selectedIndexesInSource.push_back( source().index(
						oldSourceRows[index.row()], index.column(), mapping.sourceParent ) );
				}
			} );

			for ( auto& index : staleIndexesInSelection )
				selection.remove( index );

			for ( auto& index : selectedIndexesInSource ) {
				for ( size_t i = 0; i < mapping.sourceRows.size(); ++i ) {
					if ( mapping.sourceRows[i] == index.row() ) {
						auto newSourceIndex =
							this->index( i, index.column(), mapping.sourceParent );
						selection.add( newSourceIndex );
						break;
					}
				}
			}
		} );
	} );
}