Copying a TableView field by field (in order to modify it)

Question

I'd like to copy a TableView cell by cell, so I can modify it later. I am stuck because I can't instantiate a TableColumn and thus don't know how to set the columns. I don't know what to do with rowHeader or how to do it differently.

public TableView<ObservableMap<String, CellDescriptor>> copyTableViewDeleteRow(int j)
{
    //FIXME
    TableView<ObservableMap<String, CellDescriptor>> tableViewCopy = new TableView<ObservableMap<String, CellDescriptor>> ();

    ObservableList<TableColumn<ObservableMap<String, CellDescriptor>, ?>> columns = tableView.getColumns();

    ObservableList<TableColumn<ObservableMap<String, CellDescriptor>, ?>> columnsNew = 
            tableViewCopy.getColumns();

    ListOrderedMap<String, CellDescriptor> rowHeader = new ListOrderedMap<>();

    int rowIndex = 0;
    int columnIndex = 0;
    for (TableColumn<?, ?> column : columns) {
        String cell = column.getText();
        String key = COLUMN_KEY_PREFIX + Integer.toString(columnIndex);
        CellDescriptor cd = new CellDescriptor(columnIndex, rowIndex, cell, this);
        rowHeader.put(key, cd);
        //TODO ? cannot instantiate TableColumn
        TableColumn<ObservableMap<String, CellDescriptor>, ?> columnNew = 
                //new TableColumn<ObservableList<String>, CellDescriptor>(key, cd);
                new TableColumn<ObservableMap<String, CellDescriptor>, ?>(cd);

        ++columnIndex;
    }

    ObservableList<ObservableMap<String, CellDescriptor>> itemsNew =
            tableViewCopy.getItems();

    ++rowIndex;
    for (Object row : tableView.getItems()) {
        ObservableMap<String, CellDescriptor> e = FXCollections.observableMap(new HashMap<String, CellDescriptor>());

        columnIndex = 0;
        for (TableColumn column : columns) {

            CellDescriptor cd = (CellDescriptor) column.getCellObservableValue(row).getValue();
            CellDescriptor cdNew = cd.clone();

            if(rowIndex == 1 && columnIndex == 1)
                cdNew.setText("xxx");

            e.put(COLUMN_KEY_PREFIX + columnIndex, cdNew);

            ++columnIndex;
        }

        itemsNew.add(e);

        ++rowIndex;
    }       

    System.out.println("tableViewCopy columns size=" + tableViewCopy.getColumns().size()); // is zero
    System.out.println("tableViewCopy items size=" + tableViewCopy.getItems().size()); // is three

    return tableViewCopy;
}

It seems I am missing the columns, since their size is zero.

Answer 1

I solved this issue by writing the rows to a data object, then used the existing function that creates a tableView from a data object. Function is as follows:

protected TableView<ObservableMap<String, CellDescriptor>> createTableView(TableFile tableFile)
{
    int columns = tableFile.getColumnCount();
    int rows = tableFile.getRowCount();

    ObservableList<ObservableMap<String, CellDescriptor>> data = FXCollections.observableArrayList();

    for (int i = 1; i < rows; i++)
    {
        ListOrderedMap<String, CellDescriptor> row = tableFile.getRow(i);
        ObservableMap<String, CellDescriptor> oRow = FXCollections.observableMap(row);
        data.add(oRow);
    }

    TableView<ObservableMap<String, CellDescriptor>> tableView = new TableView<>();
    tableView.setEditable(true);
    Callback<TableColumn<ObservableMap<String, CellDescriptor>, CellDescriptor>, TableCell<ObservableMap<String, CellDescriptor>, CellDescriptor>> cellFactory
        = (TableColumn<ObservableMap<String, CellDescriptor>, CellDescriptor> param) -> new ContextMenuCell();
    for (int i = 0; i < columns; i++)
    {
        String name = tableFile.getHeaderCell(i);
        String key = tableFile.getKey(i);
        TableColumn<ObservableMap<String, CellDescriptor>, CellDescriptor> tc = new TableColumn<>(name);
        tc.setCellValueFactory(new ObservableMapValueFactory<String, CellDescriptor>(key));
        tc.setCellFactory(cellFactory);
        tc.setOnEditCommit(
                (TableColumn.CellEditEvent<ObservableMap<String, CellDescriptor>, CellDescriptor> event) ->
                {
                    ObservableMap<String, CellDescriptor> map = event.getTableView().getItems().get(event.getTablePosition().getRow());
                    int ii = event.getOldValue().getI();
                    int jj = event.getOldValue().getJ();
                    String text = event.getNewValue().getText();
                    TableFile tf = event.getOldValue().getTf();
                    CellDescriptor newValue = new CellDescriptor(ii, jj, text, tf);
                    map.put(key, newValue);
                });
        ContextMenu columnContextMenue = createColumnContextMenu(i);
        tc.setContextMenu(columnContextMenue);
        tableView.getColumns().add(tc);
    }

    tableView.setItems(data);
    return tableView;
}

The data object looks like this:

        ArrayList<ListOrderedMap<String, CellDescriptor>> newData = new ArrayList<>();

and is filled as follows:

public void copyTableViewDeleteRow(int j)
{
    ArrayList<ListOrderedMap<String, CellDescriptor>> newData = new ArrayList<>();

    //TODO
    ObservableList<TableColumn<ObservableMap<String, CellDescriptor>, ?>> columns = tableView.getColumns();

    ListOrderedMap<String, CellDescriptor> rowHeader = new ListOrderedMap<>();

    int rowIndex = 0;
    int columnIndex = 0;
    for (TableColumn<?, ?> column : columns) {
        String cell = column.getText();
        String key = COLUMN_KEY_PREFIX + Integer.toString(columnIndex);
        CellDescriptor cd = new CellDescriptor(columnIndex, rowIndex, cell, this);
        rowHeader.put(key, cd);

        ++columnIndex;
    }

    newData.add(rowHeader);     

    ObservableList<ObservableMap<String, CellDescriptor>> items =
            tableViewCopy.getItems();

    ++rowIndex;
    for (Object row : tableView.getItems()) {
        ListOrderedMap<String, CellDescriptor> newRow = new ListOrderedMap<>();

        columnIndex = 0;
        for (TableColumn column : columns) {

            CellDescriptor cd = (CellDescriptor) column.getCellObservableValue(row).getValue();
            CellDescriptor cdNew = cd.clone();

            if(rowIndex == 1 && columnIndex == 1)
                cdNew.setText("xxx");

            newRow.put(COLUMN_KEY_PREFIX + columnIndex, cdNew);
            ++columnIndex;
        }

        items.add(e);
        newData.add(newRow);

        ++rowIndex;
    }       

    this.data = newData;
}