如何在不先按Enter键的情况下编辑JavaFX TableView单元格？ [英] How to make a JavaFX TableView cell editable without first pressing Enter?

问题描述

我正在学习JavaFX并实现一个TableView类。我想在没有先按Enter键或双击它的情况下使单元格可编辑。我想知道是否可以在没有先按Enter键的情况下开始输入新值？谢谢。

I am learning JavaFX and implementing a TableView class. I'd like to make a cell editable without first pressing Enter or double clicking on it. I wonder if it's possible to start entering a new value without first hitting Enter? Thank you.

推荐答案

看起来我找到了丢失第一个输入符号问题的解决方案。一旦细胞聚焦，就可以将数据输入细胞。在数据输入之前，没有必要先按Enter键或双击单元格。

Looks like I've found a solution to the problem of missing first entered symbols. Data can be entered into a cell as soon as the cell is in focus. There is no necessity to press Enter first or double click on a cell before data input.

Class CellField

//Text box cell
public class CellField {
    private static StringBuffer text = new StringBuffer("");
    public static String getText() {
        return text.toString();
    }
    public static void setText(String text) {
        CellField.text = new StringBuffer(text);
    }
    //true, if the length of more than one character
    public static boolean isLessOrEqualOneSym(){
        return CellField.text.length() <= 1;
    }
    //add character to the end of line
    public static void addSymbol(String symbol){
        text.append(symbol);
    }
    public static void clearText() { 
        setText("");
    }
}

Class NewOrderCtrl （部分代码）

class public class NewOrderCtrl extends HBox implements Initializable {
    @FXML private TableView<OrderItem> catalogTable;
    @FXML private TableColumn<OrderItem, String> numCatalogColumn;
    public void initialize(URL url, ResourceBundle resourceBundle) {
            numCatalogColumn.setCellFactory(new Callback<TableColumn<OrderItem, String>, TableCell<OrderItem, String>>() {
            @Override
            public TableCell<OrderItem, String> call(TableColumn<OrderItem, String> orderItemStringTableColumn) {
                return new EditingCell();
            }
        });
            catalogTable.setOnKeyPressed(new EventHandler<KeyEvent>() {
            @Override
            public void handle(KeyEvent keyEvent) {
                KeyCode keyCode = keyEvent.getCode();
                if (keyCode == KeyCode.ENTER || keyCode == KeyCode.ESCAPE){
                    CellField.clearText();
                }
                if (keyCode.isDigitKey()) {
                    int row = catalogTable.getSelectionModel().getSelectedIndex();
                    catalogTable.edit(row, numCatalogColumn);
                }
            }
        });
    }

    @FXML
    private void onEditStart() {
        CellField.clearText();
    }
}

类EditingCell

public class EditingCell extends TableCell<OrderItem, String> {
    private TextField textField;
    @Override
    public void startEdit() {
        if (!isEmpty()) {
            super.startEdit();
            if (textField == null) {
                createTextField();
            }
            setText(null);
            setGraphic(textField);
            setContentDisplay(ContentDisplay.GRAPHIC_ONLY);
            textField.requestFocus();
        }
    }

    @Override
    public void cancelEdit() {
        super.cancelEdit();
        setText(String.valueOf(getItem()));
        setContentDisplay(ContentDisplay.TEXT_ONLY);
    }

    @Override
    public void updateItem(String item, boolean empty) {
        super.updateItem(item, empty);
        if (empty) {
            setText(null);
            setGraphic(null);
        } else {
            if (isEditing()) {
                if (textField != null) {
                    textField.setText(getString());
                }
                setGraphic(textField);
                setContentDisplay(ContentDisplay.GRAPHIC_ONLY);
            } else {
                setText(getString());
                setContentDisplay(ContentDisplay.TEXT_ONLY);
            }
        }
    }

    private void createTextField() {
        textField = new TextField(getString());
        textField.setMinWidth(this.getWidth() - this.getGraphicTextGap() * 2);
        textField.setOnKeyPressed(new EventHandler<KeyEvent>() {
            @Override
            public void handle(KeyEvent t) {
                if (t.getCode() == KeyCode.ENTER) {
                    commitEdit(textField.getText());
                    EditingCell.this.getTableView().requestFocus();//why does it lose focus??
                    EditingCell.this.getTableView().getSelectionModel().selectBelowCell();
                } else if (t.getCode() == KeyCode.ESCAPE) {
                    cancelEdit();
                }
            }
        });

        textField.setOnKeyReleased(new EventHandler<KeyEvent>() {
            @Override
            public void handle(KeyEvent t) {
                if (t.getCode().isDigitKey()) {
                    if (CellField.isLessOrEqualOneSym()) {
                        CellField.addSymbol(t.getText());
                    } else {
                        CellField.setText(textField.getText());
                    }
                    textField.setText(CellField.getText());
                    textField.deselect();
                    textField.end();
                    textField.positionCaret(textField.getLength() + 2);//works sometimes

                }
            }
        });
    }

    private String getString() {
        return getItem() == null ? "" : getItem();
    }
}

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