javafx 创建 ComboBox TableCell [英] javafx create ComboBox TableCell

问题描述

我正在尝试在我的 TableView 中创建自定义 TableCell.我希望它显示一个 ComboBox，我可以在其中选择一个字符串值，然后将字符串值显示为用户输入.这个想法是用户不知道哪些是允许的值，所以他可以简单地在 ComboBox 中选择其中一个.

I'm trying to create a custom TableCell in my TableView. I'd like it to display a ComboBox where I can choose a String value, and then display the String value as if it was an user input. The idea is that ths user doesn't know which are the allowed values so he can simply pick one of them in the ComboBox.

我试图这样做制作我自己的ComboBoxCell"，但它没有按预期工作:

I tried to do that making my own "ComboBoxCell" but it doesn't work as expected :

public class ComboBoxCell extends TableCell<ClassesProperty, String> {

    private ComboBox<String> comboBox;

    public ComboBoxCell() {
    }

    @Override
    public void startEdit() {
        super.startEdit();

        if (comboBox == null) {
            createComboBox();
        }

        setGraphic(comboBox);
        setContentDisplay(ContentDisplay.GRAPHIC_ONLY);
    }

    @Override
    public void cancelEdit() {
        super.cancelEdit();

        setText(String.valueOf(getItem()));
        setContentDisplay(ContentDisplay.TEXT_ONLY);
    }

    public void updateItem(String item, boolean empty) {
        super.updateItem(item, empty);

        if (empty) {
            setText(null);
            setGraphic(null);
        } else {
            if (isEditing()) {
                if (comboBox != null) {
                    comboBox.setValue(getString());
                }
                setGraphic(comboBox);
                setContentDisplay(ContentDisplay.GRAPHIC_ONLY);
            } else {
                setText(getString());
                setContentDisplay(ContentDisplay.TEXT_ONLY);
            }
        }
    }

    private void createComboBox() {
        // ClassesController.getLevelChoice() is the observable list of String
        comboBox = new ComboBox<>(ClassesController.getLevelChoice());
        comboBox.setMinWidth(this.getWidth() - this.getGraphicTextGap()*2);
        comboBox.setOnKeyPressed(new EventHandler<KeyEvent>() {
            @Override
            public void handle(KeyEvent t) {
                if (t.getCode() == KeyCode.ENTER) {
                    commitEdit(comboBox.getSelectionModel().getSelectedItem());
                } else if (t.getCode() == KeyCode.ESCAPE) {
                    cancelEdit();
                }
            }
        });
    }

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

然后在我的主"应用程序中:

Then in my "main" app :

levelChoice = FXCollections.observableArrayList(
        new String("Bla"),
        new String("Blo")
    );

// Level Column : String value
Callback<TableColumn, TableCell> comboBoxFactory = new Callback<TableColumn, TableCell>() {
        @Override
        public TableCell call(TableColumn p) {
            return new ComboBoxCell();
        }
    };

levelColumn.setCellValueFactory(
        new PropertyValueFactory<ClassesProperty, String>("level")
    );
levelColumn.setCellFactory(comboBoxFactory);

有什么想法吗?谢谢！

推荐答案

我找到了解决方案:

levelChoice = FXCollections.observableArrayList("Bla", "Blo");

levelColumn.setCellValueFactory(
    new PropertyValueFactory<ClassesProperty, String>("level")
);
levelColumn.setCellFactory(ComboBoxTableCell.forTableColumn(levelChoice));
levelColumn.setOnEditCommit(
    new EventHandler<CellEditEvent<ClassesProperty, String>>() {
        @Override
        public void handle(CellEditEvent<ClassesProperty, String> t) {
            ((ClassesProperty) t.getTableView().getItems().get(t.getTablePosition().getRow())).setLevel(t.getNewValue());
        };
    }
);

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