JavaFX tableview edit that clicks and automatically inserts rows?

I use tableview in my program to display a few good lines

Question 1: when a user wants to modify a value, he will double-click to edit the cell. I want my user to select any row and start typing

Question 2: in my program, the user can insert 100 rows a day. I need a policy to automatically add rows. For example, when he inserts a row, it should add an empty row under the current row to easily complete his data input

Please help me solve these problems, because my users input a lot of data every day thank you.

Solution

This is an example

>Enter edit mode immediately after entering on the typed cell > create a new row when you press enter on the last row (for example only) Alternatively, you can click the button to add a new row If you want to create a new line using tab on the last line, you must change the code accordingly

I recommend not using blank lines because they appear in your model

InlineEditingWithDynamicRowAdding. java

import javafx.application.Application;
import javafx.scene.control.TableView;
import javafx.collections.ObservableList;
import javafx.stage.Stage;
import javafx.util.Callback;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableCell;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.beans.property.DoubleProperty;
import javafx.collections.FXCollections;
import javafx.scene.input.KeyEvent;
import javafx.event.EventHandler;
import javafx.scene.control.SelectionMode;
import javafx.scene.input.KeyCode;
import javafx.scene.control.TablePosition;
import javafx.scene.layout.FlowPane;
import javafx.scene.control.Button;
import javafx.scene.layout.BorderPane;
import javafx.util.StringConverter;
import javafx.scene.Scene;
import javafx.scene.control.cell.TextFieldTableCell;

public class InlineEditingWithDynamicRowAdding extends Application {

    private final ObservableList<Data> data =
        FXCollections.observableArrayList(
                new Data(1.,5.),new Data(2.,6.),new Data(3.,7.),new Data(4.,8.)
        );

    private TableView<Data> table;

    @Override
    public void start(Stage stage) {

        // create edtiable table
        table = new TableView<Data>();
        table.setEditable(true);

        // column 1 contains numbers
        TableColumn<Data,Number> number1Col = new TableColumn<>("Number 1");
        number1Col.setMinWidth(100);
        number1Col.setCellValueFactory( cellData -> cellData.getValue().number1property());
        number1Col.setCellFactory( createNumberCellFactory());

        // column 2 contains numbers
        TableColumn<Data,Number> number2Col = new TableColumn<>("Number 2");
        number2Col.setMinWidth(100);
        number2Col.setCellValueFactory( cellData -> cellData.getValue().number2property());
        number2Col.setCellFactory( createNumberCellFactory());

        // add columns & data to table
        table.setItems(data);
        table.getColumns().addAll( number1Col,number2Col);




        // switch to edit mode on keypress
        // this must be KeyEvent.KEY_PRESSED so that the key gets forwarded to the editing cell; it wouldn't be forwarded on KEY_RELEASED
        table.addEventFilter(KeyEvent.KEY_PRESSED,new EventHandler<KeyEvent>() {
            @Override
            public void handle(KeyEvent event) {

                if( event.getCode() == KeyCode.ENTER) {
//                  event.consume(); // don't consume the event or else the values won't be updated;
                    return;
                }

                // switch to edit mode on keypress,but only if we aren't already in edit mode
                if( table.getEditingCell() == null) {
                    if( event.getCode().isLetterKey() || event.getCode().isDigitKey()) {  

                        TablePosition focusedCellPosition = table.getFocusModel().getFocusedCell();
                        table.edit(focusedCellPosition.getRow(),focusedCellPosition.getTableColumn());

                    }
                }

            }
        });

        table.addEventFilter(KeyEvent.KEY_RELEASED,new EventHandler<KeyEvent>() {
            @Override
            public void handle(KeyEvent event) {

                if( event.getCode() == KeyCode.ENTER) {


                    // move focus & selection
                    // we need to clear the current selection first or else the selection would be added to the current selection since we are in multi selection mode 
                    TablePosition pos = table.getFocusModel().getFocusedCell();

                    if (pos.getRow() == -1) {
                        table.getSelectionModel().select(0);
                    } 
                    // add new row when we are at the last row
                    else if (pos.getRow() == table.getItems().size() -1) {
                        addRow();
                    } 
                    // select next row,but same column as the current selection
                    else if (pos.getRow() < table.getItems().size() -1) {
                        table.getSelectionModel().clearAndSelect( pos.getRow() + 1,pos.getTableColumn());
                    }


                }

            }
        });     

        // single cell selection mode
        table.getSelectionModel().setCellSelectionEnabled(true);

        // add row index column as 1st column
        // -------------------------------------
        TableColumn<Data,Data> indexCol = new TableColumn<Data,Data>("#");

        indexCol.setCellFactory(new Callback<TableColumn<Data,Data>,TableCell<Data,Data>>() {
            @Override public TableCell<Data,Data> call(TableColumn<Data,Data> param) {
                return new TableCell<Data,Data>() {
                    @Override protected void updateItem(Data item,boolean empty) {
                        super.updateItem(item,empty);

                        if (this.getTableRow() != null) {

                            int index = this.getTableRow().getIndex();

                            if( index < table.getItems().size()) {
                                int rowNum = index + 1;
                                setText( String.valueOf(rowNum));
                            } else {
                                setText("");
                            }

                        } else {
                            setText("");
                        }

                    }
                };
            }
        });

        table.getColumns().add( 0,indexCol); // number column is at index 0

        // allow multi selection
        table.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);

        // buttons
        // --------------------------------------------
        FlowPane buttonBar = new FlowPane();

        // add new row button
        Button addButton = new Button( "Add");
        addButton.setOnAction(e -> {
            addRow();
        });
        addButton.setFocusTraversable(false);// don't let it get the focus or else the table would lose it when we click the button and we's have to request the focus on the table in the event handler

        // remove selected rows button
        Button removeButton = new Button( "Remove");
        removeButton.setOnAction(e -> {
            removeSelectedRows();
        });
        removeButton.setFocusTraversable(false);// don't let it get the focus or else the table would lose it when we click the button and we's have to request the focus on the table in the event handler

        buttonBar.getChildren().addAll( addButton,removeButton);

        // add nodes to stage
        BorderPane root = new BorderPane();
        root.setCenter(table);
        root.setBottom(buttonBar);

        Scene scene = new Scene( root,800,600);
        scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());

        stage.setScene(scene);
        stage.show();


        // select first cell
        // TODO: why isn't this selecting the 1st cell in the index column?
        table.getSelectionModel().selectFirst();

    }

    /**
     * Insert a new default row to the table,select a cell of it and scroll to it. 
     */
    public void addRow() {

        // get current position
        TablePosition pos = table.getFocusModel().getFocusedCell();

        // clear current selection
        table.getSelectionModel().clearSelection();

        // create new record and add it to the model
        Data data = new Data(0d,0d);
        table.getItems().add( data);

        // get last row
        int row = table.getItems().size() - 1;
        table.getSelectionModel().select( row,pos.getTableColumn());

        // scroll to new row
        table.scrollTo( data);

    }

    /**
     * Remove all selected rows.
     */
    public void removeSelectedRows() {

        table.getItems().removeAll(table.getSelectionModel().getSelectedItems());

        // table selects by index,so we have to clear the selection or else items with that index would be selected 
        table.getSelectionModel().clearSelection();


    }

    /**
     * Number cell factory which converts strings to numbers and vice versa.
     * @return
     */
    private Callback<TableColumn<Data,Number>,Number>>  createNumberCellFactory() {

        Callback<TableColumn<Data,Number>> factory = TextFieldTableCell.forTableColumn( new StringConverter<Number>() {

            @Override
            public Number fromString(String string) {
                return Double.parseDouble(string);
            }

            @Override
            public String toString(Number object) {
                return object.toString();
            }
        });

        return factory;
    }

    /**
     * Table data container
     */
    public static class Data {

        private final SimpleDoubleProperty number1;
        private final SimpleDoubleProperty number2;

        private Data( Double number1,Double number2) {
            this.number1 = new SimpleDoubleProperty(number1);
            this.number2 = new SimpleDoubleProperty(number2);
        }

        public final DoubleProperty number1property() {
            return this.number1;
        }

        public final double getNumber1() {
            return this.number1property().get();
        }

        public final void setNumber1(final double number1) {
            this.number1property().set(number1);
        }

        public final DoubleProperty number2property() {
            return this.number2;
        }

        public final double getNumber2() {
            return this.number2property().get();
        }

        public final void setNumber2(final double number2) {
            this.number2property().set(number2);
        }


    }

    public static void main(String[] args) {
        launch(args);
    }


}

application. css

/* edit cell appearance */

/* If the padding is 0,then there's a grey area. If you set it to 2,then there won't be a great area.
 * However if you use a border color,then the border requires its size,so the padding is set to 2 - 1 = 1.
 * You have to toy around with the border. If necessary give it a width of 2 and make it the same color as the background color.
 */
.text-field-table-cell .text-field {
   -fx-padding: 1; 
   -fx-border-color:red; 
   -fx-border-width:1; 
   -fx-background-color:yellow;
 }
.table-cell:focused {
   -fx-padding: 0;
}

/* right-align the cell content in view mode */
.table-cell {
    -fx-alignment: CENTER-RIGHT;
}
/* right-align the cell content in edit mode */
.text-field {
    -fx-alignment: CENTER-RIGHT;
}

/* colorize background only of rows which have data */
.table-row-cell:empty {
    -fx-background-color: white;
}

.table-row-cell:empty .table-cell {
    -fx-border-width: 0px;
}