JavaFX TableView 通过单击和自动插入行进行编辑？

Question

我在我的程序中使用了 tableview 来显示几行，这很好。
我的程序用于会计，如您所知，其中插入了大量数据，我使用了表 View ，但遇到了很多问题:。

问题 1:当用户想要修改一个值时，他将双击以编辑单元格，我希望我的用户选择任何行并开始输入。

问题 2:在我的程序中，用户可能会为一天的工作插入 100 行我需要一种自动添加行的策略，例如，当他插入行时，它应该在当前行下添加一个空行以轻松完成他的数据输入。

请帮我解决这些问题，因为我的用户每天都会输入大量数据。
谢谢。

Answer 1

这是一个例子

在聚焦的单元格上输入后立即进入编辑模式

在最后一行按 Enter 键时创建一个新行(仅作为示例)。或者，您可以单击按钮添加新行。如果您希望在最后一行中使用 tab 来创建新行，则必须相应地更改代码。

我建议不要使用空行，因为它们会出现在您的模型中。

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>, TableCell<Data, Number>>  createNumberCellFactory() {

        Callback<TableColumn<Data, Number>, TableCell<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);
    }


} 

应用程序.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;
}